Analysis of the reasons why the spindle of the CNC machining center does not rotate

The spindle of the CNC machining center has direct transmission and belt drive methods. In the application process, the spindle of the machining center with the belt drive method does not rotate. What is the reason for this? Interested friends come together Understand!
① Caused by a mechanical transmission problem of the CNC machining center: First, check whether the belt transmission of the spindle of the machining center is cracked.
② Check the lack of phase or reverse phase of the three-phase power supply to the spindle of the cnc machining center: check the power supply and replace any two power lines.
③ Circuit connection error of CNC machining center: Please refer to the circuit connection manual carefully to ensure correct wiring.
④ There is no corresponding spindle control signal output in the CNC machining center system: Use a multimeter to measure the signal output end of the system. If there is no spindle control signal output, you need to replace the relevant IC components or send it to the factory for repair.
⑤ The CNC machining center system has the corresponding spindle control signal output, but the power supply circuit and the control signal output circuit are open or the components are damaged: Use a multimeter to check the power supply circuit and signal control circuit between the CNC machining center system and the spindle motor. Whether there is an open circuit; whether there is an open circuit; whether the contacts between the wires are in poor contact; whether the contactor and DC relay are damaged; check whether the thermal relay is overcurrent;

How to increase the accuracy of the workpiece during machining by the machining center?

Any machining equipment, such as machining road setting, cnc machining program preparation, machining tool selection, machine tool problems, clamping problems and workpiece raw materials, will have a certain impact on the final machining accuracy and machining efficiency of the workpiece during workpiece machining. As a high-precision and efficient machining equipment, the vertical machining center commonly used methods to reduce workpiece machining errors include the reduction of original error method, error compensation method, error transfer method, error grouping method, error uniform method, and error synthesis method.
First, the error synthesis method eliminates the error of the machine tool itself is the most important way to ensure the final machining accuracy of the workpiece. The error synthesis method requires measuring the original errors of each axis of the machine tool. The laser interferometer is the primary detection instrument for vertical machining centers because of its high measurement accuracy and flexible application.
Second, the error compensation method The error compensation method is to artificially create an error to offset the original errors inherent in the process system, or use one type of original error to offset another type of original error, and then reach the vertical machining center to improve the workpiece machining accuracy. intention. Generally, by reducing the gap of the machine tool, improving the rigidity of the machine tool, pre-loading is selected to make the pre-tensioning of the relevant cooperation, and eliminate the influence of the gap. It can also improve the rigidity of the workpiece and the tool, reduce the overhang of the tool and the workpiece, and improve the rigidity of the process system. You can also choose a reasonable clamping method and cnc machining method, reduce cutting force and its changes, reasonably select tool data, increase rake angle and principal declination angle, and perform reasonable heat treatment on workpiece data to improve data machining performance, etc. Several ways.
Third, the direct reduction of the original error method The direct reduction of the original error method refers to the identification of the primary original error factors that affect the machining accuracy, and try to eliminate or reduce them directly. For example, after a long-term use of the vertical machining center, the transmission system formed due to natural wear is out of alignment, reverse clearance, etc.
Fourth, the error uniform method Error uniform method is to use closely related surfaces to compare with each other and correct each other, or use each other as the basis for machining, in order to reach the vertical machining center to eliminate machining errors.
V. Error transfer method The essence of the error transfer method is the inductive errors caused by the transfer errors, stress deformation and thermal deformation of the transfer process system. For example, the vertical machining center performs some hole machining. The coaxiality of the workpiece is not ensured by the turning accuracy of the machine tool spindle, but by the fixture. When the machine tool spindle and the workpiece are floating, the original errors of the machine tool spindle will no longer be Affects the machining accuracy, and transferred to the fixture to ensure the machining accuracy.
Sixth, the error grouping method In the vertical machining center machining, because of the existence of the error of the process blank, the machining error of this step has been formed. The change of the blank error has two main effects on the process: reaction error and positioning error.
If the above-mentioned errors are too large, the machining accuracy cannot be ensured, and it is not realistic to improve the accuracy of the blank or the cnc machining accuracy of the previous procedure. At this time, the error grouping method can be used, that is, the blank or the upper process scale is divided into n groups according to the error error. The error of each group of blanks is reduced to 1 / n, and then the relative orientation of the tool and the workpiece is adjusted according to each group. Adjust the positioning elements so that the scale dispersion of the entire batch of workpieces can be greatly reduced. The essence of the error grouping method is to make up for the lack of machining accuracy by means of improving the measurement accuracy, and then to eliminate the effects of machining errors.

What are the conditions that the vertical machining center needs to be satisfied when using it?

A vertical machining center is a cnc machining center with a straight spindle. Most of its structures are fixed columns, the working table is rectangular, and there is no indexing rotation function. Suitable for machining disc, sleeve and sheet metal parts. It generally has three linear motion coordinate axes and is capable of rotating the table along the horizontal axis on the work table to handle the spiral parts. Vertical machining centers are easy to equip, operate, investigate, debug and use. However, due to the limitations of the column height and tool change equipment, too high parts cannot be machined. The use of vertical machining centers must satisfy the following four conditions:
1. The environmental requirements for the location of the vertical machining center; the orientation of the vertical machining center should be away from the source of vibration, to prevent the influence of direct sunlight and heat radiation, and the influence of moisture and airflow. If there is an oscillation source near the CNC machine tool, an anti-vibration groove should be set around the machining center. Otherwise, it will directly affect the machining accuracy and stability of the CNC machining center, cause poor contact of electronic components, form failures, and affect the reliability of the machining center.
2. Power supply requirements; general machining center equipment in the mechanical workshop, not only changes in environmental temperature, but also poor operating conditions, many types of mechanical and electrical equipment, power grid shake. Therefore, the orientation of the machining center requires strict control of the power supply voltage. The power supply voltage must be within the agreed range and must be relatively stable. Otherwise it will affect the normal operation of the CNC system of the machining center.
3. Temperature conditions; the ambient temperature of the CNC machining center is lower than 30 degrees, and the relative temperature is lower than 80%. Generally speaking, there is an exhaust fan or cooling fan inside the numerical control electric control box, so that the electronic components, especially the central cnc machining unit, adhere to a stable operating temperature or a small temperature difference. Excessive temperature and humidity can lead to shortened life of control system components and lead to faulty additions. The temperature and humidity increase, and the addition of dust can cause adhesion and short circuits on the integrated circuit board.
4. When using the machining center, the user does not agree to change the parameters set by the manufacturer in the control system at will. The setting of these cnc machining center parameters is directly related to the dynamic characteristics of each part of the machining center. As long as the value of the gap compensation parameter can be adjusted according to the actual situation

Simple difference between beryllium copper and brass

The simple difference between brass and beryllium bronze is also the color.
Bronze is named for its blue color, and brass is named for its yellow color. Therefore, it can be roughly distinguished from the color. A strict distinction is required for metallographic analysis.
The dark green you said is still the color of rust, not the nature of bronze.
Here are some basic knowledge of copper alloys:
Copper alloy
Adding certain alloying elements (such as zinc, tin, aluminum, beryllium, manganese, silicon, nickel, phosphorus, etc.) to pure copper forms a copper alloy. Copper alloys have good electrical conductivity, thermal conductivity and corrosion resistance, as well as high strength and wear resistance.
According to the composition, copper alloys are divided into brass and bronze.
1. Brass is a copper alloy with zinc as the main alloying element. According to the chemical composition, brass is divided into ordinary copper and special brass.
(1) Ordinary brass Ordinary machining brass is a copper-zinc binary alloy. Due to its good plasticity, it is suitable for manufacturing plates, rods, wires, pipes and deep-drawn parts, such as condensing pipes, heat pipes and mechanical and electrical parts. Brass with an average copper content of 62% and 59% can also be cast and is called cast brass.
(2) Special brass In order to obtain the strength, corrosion resistance and good casting properties, aluminum, silicon, manganese, lead, tin and other elements are added to the copper-zinc alloy to form special brass. Such as lead brass, tin brass, aluminum brass, silicon brass, manganese brass and so on.
Lead brass has excellent cutting performance and good abrasion resistance. It is widely used in the manufacture of watch parts, and is manufactured by casting to make bushes and bushes.
Tin brass has good corrosion resistance and is widely used in the manufacture of marine parts.
Aluminum in aluminum brass can increase the strength and hardness of brass and improve the corrosion resistance in the atmosphere. Aluminum brass is used to make corrosion-resistant parts.
Silicon in silicon brass can improve the mechanical properties and abrasion resistance of copper. Silicon brass is mainly used in the manufacture of marine parts and chemical machinery parts.
2. Bronze
Bronze used to refer to copper-tin alloys, but it is customary in the industry to refer to copper alloys containing aluminum, silicon, lead, beryllium, manganese, etc., so bronze actually includes tin bronze, aluminum bronze, aluminum bronze, beryllium copper, and silicon bronze , Lead bronze, etc. Bronze is also divided into two categories: pressure-processed bronze and cast bronze.
(1) Tin bronze A copper-based alloy with tin as its main alloying element is called tin bronze. Most of the tin bronzes used in industry are between 3% and 14%. Tin bronze with a tin content of less than 5% is suitable for cold processing; tin bronze with a tin content of 5% to 7% is suitable for hot processing; tin bronze with a tin content of more than 10% is suitable for casting. Tin bronze is widely used in shipbuilding, chemical industry, machinery, instrumentation and other industries. It is mainly used for manufacturing wear-resistant parts such as bearings, bushings and elastic components such as springs, as well as corrosion-resistant and anti-magnetic parts.
(2) Aluminum bronze A copper-based alloy with aluminum as its main alloying element is called aluminum bronze. Aluminum bronze has higher mechanical properties than brass and tin bronze. The aluminum content of practically applied aluminum bronze is between 5% and 12%, and aluminum bronze with aluminum content of 5% to 7% is plastic and suitable for cold processing. When the aluminum content is more than 7% to 8%, the strength increases, but the plasticity decreases sharply, so it is mostly used in the as-cast or after hot working. Aluminum bronze has higher wear resistance and corrosion resistance in the atmosphere, seawater, seawater carbonic acid and most organic acids than brass and tin bronze. Aluminum bronze can manufacture gears, shaft sleeves, worm gears and other high-strength anti-wear parts and high corrosion-resistant elastic components.
(3) Beryllium bronze A copper alloy based on beryllium is called beryllium bronze. The beryllium bronze has a beryllium content of 1.7% to 2.5%. Beryllium bronze has high elastic limit and fatigue limit, excellent wear resistance and corrosion resistance, good electrical and thermal conductivity, non-magnetic, and no sparks when impacted. Beryllium bronze is mainly used to make important springs for precision instruments, clocks and gears, bearings, bushes that work under high speed and high pressure, and welding machine electrodes, explosion-proof tools, and marine compasses.

Beryllium copper heat treatment method

Heat treatment of tin bronze Tin bronze cannot be strengthened by heat treatment, but must be deformed by cooling to improve its strength and elastic properties.
The main ways are:
(1) Complete annealing, used in the intermediate softening process, to ensure the plastic deformation performance of large deformation cnc machining in subsequent processes.
(2) Incomplete annealing, used to obtain the plasticity consistent with the subsequent steps before forming the elastic element, so as to ensure a certain amount of forming deformation in the subsequent steps, and to achieve the spring performance.
 (3) Stable annealing, used for the final heat treatment after the spring is formed to eliminate cold working stress and stabilize the spring’s external dimensions and elastic properties.
 Specification for heat treatment of tin bronze spring materials
Material grade
 2. Heat treatment of beryllium bronze The heat treatment of beryllium bronze can be divided into annealing treatment, solution treatment and aging treatment after solution treatment.
 The return (return) treatment is divided into:
(1) The intermediate softening annealing can be used for the intermediate softening process.
 (2) Stabilized tempering is used to eliminate the processing stress generated during precision spring and calibration, and to stabilize the external dimensions.
 (3) Stress-relief tempering is used to eliminate machining stress generated during machining and calibration.
  Heat treatment specification for Beryllium Bronze Spring material Material grade Intermediate soft annealing stabilization tempering stress relief tempering time (h) temperature time (h) temperature time (h) QBe1.7 540 ~ 560 2 ~ 4 110 ~ 130 4 ~ 6 200 ~ 250 1 ~ 2 QBe1.9 540 ~ 560 2 ~ 4 110 ~ 130 4 ~ 6 200 ~ 250 1 ~ 2
QBe2 540 ~ 560 2 ~ 4 110 ~ 130 4 ~ 6 200 ~ 250 1 ~ 2 QBe2.15 540 ~ 560 2 ~ 4 110 ~ 130 4 ~ 6 200 ~ 250 1 ~ 2
Specification for solution treatment and time efficiency treatment of beryllium copper spring materials
Material grade solution treatment purpose and application range Aging treatment temperature ℃ thickness / time (min) * temperature ℃ time h QBe1.7 QBe1.9 QBe2 QBe2.15 800 ± 10 0.1 ~ 1.0 / 5 ~ 9 Grain is easy to grow , Suitable for thicker, thicker material plates / belts / wires 315 ± 5 diameter 5 ~ 30 320 ± 5 Y state: 1 ~ 2 Y2 state: 2 C state: 2 ~ 3 780 ± 10 1.0 ~ 5.0 / 12 ~ 30
Good comprehensive performance, used for softening and tissue preparation before aging 760 ± 10 5.0 ~ 10/25 ~ 30
Obtain fine grain structure, which is beneficial to improve the fatigue strength of the spring
Note: The heat preservation time of solution treatment has a great influence on the grain size of the material and the properties after precipitation hardening. It should be determined by the diameter and thickness of the material and through experiments.
After the aging treatment, the heat preservation time can be cooled in the air.
3. Heat treatment of silicon bronze wire Silicon bronze is a Cu-si-Mn ternary alloy.
It has good strength, hardness, elasticity, plasticity and wear resistance, and its cold and hot workability is also better.
It cannot be strengthened by heat treatment and can only be used in the annealed and machining copper hard state. After the spring is formed, only 200 ~ 280 ° C stress relief tempering treatment is required.

Application and advantages and disadvantages of beryllium bronze

The strength of beryllium copper can reach 1500N / mm2 through aging hardening treatment.
Therefore, it can be used in high-strength elastic materials that can withstand higher bending capacity.
Workability of Beryllium Bronze Before hardening, complex forming can be performed.
The B-type and S-type in-plant hardened materials that do not require post-machining heat treatment are materials with excellent balance of strength and formability.
The conductivity of beryllium bronze is based on different alloys and specifications, and the conductivity can be between 20% and 70% of the% IACS (International Annealed Copper Standard) range.
Therefore, it can be used as a highly conductive elastic material. The fatigue resistance of beryllium copper has excellent fatigue resistance (high cycle times), so it is widely used in parts and components that require long service life and high reliability.
The heat resistance of beryllium bronze can be used in a wide temperature range because the stress relaxation rate is still small in a high temperature environment.
Corrosion resistance of beryllium bronze Compared to copper alloys such as white copper, beryllium copper has corrosion resistance. Copper machining material that is almost immune to environmental changes

Application of Beryllium Copper in the Industry

Beryllium copper, also known as beryllium bronze, is the “elasticity” of copper alloys. After solid solution aging heat treatment, high strength and high conductivity products can be obtained. High-strength cast beryllium bronze alloy, after heat treatment, not only has high strength, high hardness, but also has the advantages of wear resistance and corrosion resistance, excellent casting performance, beryllium copper 173 is suitable for manufacturing various molds, explosion-proof safety tools, wear-resistant Such as cams, gears, worm gears, bearings, etc. Highly conductive cast beryllium copper alloy with high electrical conductivity and thermal conductivity after heat treatment. Beryllium copper alloy is suitable for manufacturing switch parts, strong contact and similar current-carrying components, making resistance welding clamps, electrode materials and plastic molds. , Inner sleeve of mold for hydroelectric continuous casting machine, etc.
 High beryllium copper has the characteristics of high strength, high hardness, high conductivity, high elasticity, wear resistance, fatigue resistance, corrosion resistance and small elastic hysteresis. It is mainly used for temperature controllers, mobile phone batteries, computers, automotive parts, micro Motors, brush pins, bearings, glasses, contacts, gears, punches, various non-sparking switches, various welding electrodes and precision casting molds.
 The high-performance beryllium copper is mainly used in various working conditions of non-ferrous metal low-pressure and gravity casting molds. Through in-depth study of the internal causes of failure, composition and resistance to liquid metal corrosion of beryllium bronze molds, it has developed high conductivity (thermal), high High-performance beryllium bronze mold material combining strength, abrasion resistance, high temperature resistance, high toughness, and resistance to metal liquid erosion, solves the domestic low-pressure non-ferrous metals, gravity casting molds are easy to crack, easy to wear and other problems, which significantly improves the mold life And casting strength; overcome the metal slag adhesion and erosion of the mold; improve the surface quality of the casting; reduce production costs; make the life of the mold close to the import level. The high-performance beryllium copper mold material has a hardness between 38-43, a density of 8.3g / cm3, and the main additive element is beryllium, which contains beryllium 1.9% -2.15%. It is widely used in plastic injection molding molds for internal inserts, Die core, die-casting punch, hot runner cooling system, thermal nozzle, integral cavity of blow mold, automobile mold, wear plate, etc.

Beryllium bronze is widely used

Beryllium copper material is vacuum smelting, hot rolling, cold rolling and special heat treatment process. It has the advantages of high strength, high elasticity, non-magnetic, abrasion resistance, low temperature resistance, non-magnetic, high conductivity, no spark impact and so on.

And has good fluidity and ability to reproduce fine. Known as the king of non-ferrous metal elasticity, it is widely used in aerospace, electrical appliances, mining, petroleum, communications equipment, meters, and home appliances industries. Mainly used for flexible connectors and constant temperature parts.

     High-performance beryllium copper has hardness between 38-43, density of 8.3g / cm3, beryllium 1.9% -2.15%, and is widely used in plastic injection molding mold inserts, mandrels, die-casting punches, hot-lane cooling systems, Hot nozzle, blow mold cavity, car mold, wear plate, etc.

Cnc Machining Price Calculation List Form

1. Calculation method (applicable to new parts)

① Ordinary carbon steel, material (blank) unit price × blank weight (above 20KG) × 3 times coefficient.

② Stainless steel, material (blank) unit price × blank weight (above 20KG) × 3.5 times factor.

③ For other materials, refer to the above two calculations.

④ Parts below 20KG are valued by the timing method.

2. Timing method (applicable to repaired parts)

Serial number





Processing range

Processing cost

Yuan yuan hour


Ordinary horizontal lathe

C6140 × 2m × 2 units

1. Cnc Machining and repairing discs, sets, wheels, etc. within φ400 × 200. For example: manufacture and repair of pipeline flanges; manufacture and repair of various transmission couplings and pulleys; manufacture and repair of pump packings and connection sleeves.

2. Shafts, rollers, long tubes, etc. within φ200 × 2000. For example: manufacture and repair of various pump shafts, connecting shafts, mixing shafts, various threads, worms, etc .; manufacture and repair of various drive rollers, return rollers, small support rollers, etc.



Horizontal saddle lathe

C6280 × 6 meters

× 1

1. Processing and repairing roller shaft heads, screw shaft heads within φ800 × 6000. For example: repair and manufacture of shaft heads such as return rollers and spirals.

2. Through shaft, roller surface, long tube within φ450 × 6000. For example: the manufacturing and roll surface repair of equipment guide rolls, return rolls, etc .; the manufacture and repair of large shaft thruster shafts, stirring shafts, transmission shafts, etc.

3. Disks, sets, wheels, etc. within φ1000 × 310. For example: manufacturing and repairing of large flanges, pulleys, couplings, pump side covers, housings, etc. Manufacture and repair of large parts threads, worms, oil tanks, etc.



Heavy horizontal lathe

C61148 × 12 meters × 1 unit

1. Processing and repairing large roller shaft heads, screw shaft heads within φ1250 × 12000. For example: processing and repair of large roller shaft heads, threads; processing and repair of large shaft shaft heads, threads; manufacturing and repair of large flanges, end plates, pulleys, etc.

2. Through shaft, roller surface, long tube, etc. within φ900 × 12000. For example: the processing and repair of large rolls; the manufacture and repair of large shafts.



Dynamic balance

HM6U × 12 tons × φ2m × 1set

It can meet the needs of dynamic balancing rollers, shafts, and impellers.



Horizontal lifting table milling machine

X6140 × 1

It can process and repair boxes, planes, keyways, etc. within 1000 × 320 × 360. For example: more precise bases, platforms, pads, etc. for milling planes or faces; slotting on parts, keyways on shafts, milling polyhedrons, and other parts for keyway or milling faces with outer diameters.




B665 × 1

It can process and repair boxes, planes, inner-hole keyways, etc. within 650 × 520 × 350. For example: general planes such as boxes, foundations, pads, etc .; precision requirements; couplings, pulleys, etc. Plane single keyway with inner hole inside wheels and sleeves.



slotting machine

B5020E × 1

Machining inner hole slots, flat, multi-sided, splined sleeves within φ500 × 200. For example: Couplings, pulleys and other wheels, sleeves within 200 are inserted into single key groove, double key groove, spline groove.



Radial Drilling Machine

Z3050 × 1

Drill holes within φ50 × length 1600 × height 1220. For example: drilling holes in flanges, shafts, sleeves, boxes, etc.



Horizontal metal band sawing machine

GB4240 × 1

It can saw square, round tubes and solid shafts up to 400 × 400; cutting machine tools.



CNC roll grinder

MK84100 × 6m × 1set

It can process and grind rollers, shafts, and roller surfaces within Φ1000 × 6000. For example: roller surface straight, convex, concave, irregular curve and shaft head grinding. Large shafts and rollers of various materials φ300 × 1.5 tons or more are convex, concave and linear grinding.



Universal cylindrical grinder

MW1432B × 3m × 1set

It can process and grind rollers, shafts, shaft heads, etc. within Φ320 × 3000. For example: various types of pump shafts, connecting shafts, transmission shafts, gear shafts, rotor shafts, oil, cylinder heads, etc. that require high accuracy.



Lawn knife sharpener

MDD-3000D × 4

It can grind cross-cut (strip) blades with a length of 3 meters long x 200 wide x 15-40 thick.



Scraper sharpener

MDD-3500C × 1

It can be used to grind cross-cut (strip) blades with a length of 3.5 meters × 200 × thickness 1-40.



Trolley type heat treatment furnace

RT2-120-9 × 1

Quenching, annealing, normalizing and other heat treatment of parts with a volume of 2000 × 1000 × 700. It can quench, normalize and anneal various shafts, sleeves, gears, tools, worms, etc.

120-150 (batch)



LHEA 4 × 30 (15 + 15) t × 28.5m × 1

For large parts that need to be hoisted by the vehicle, the actual usage time of Anzhao vehicle is charged.



Super audio induction heater

LSW-80 × 1

Parts that need to be heated and baked within a diameter of 800. For example: heated foot parts such as foot bolts and 卡 -type cards; various rollers and other shafts, bulkheads, and tubes that can be heated and baked.



Welding machine

1 set

Carbon steel or stainless steel repair welding, welding, riveting, etc.



Cutting machine, gas laser cutting, polishing machine, hand drill and other tools

1 for each

Auxiliary machining tools.



Disassembly, assembly, assembly

Disassembly, assembly and assembly of parts, such as assembly and assembly of couplings, bearings, pulleys, spindles, etc.



Rust prevention, painting, packaging, etc.

The final work item after the parts assembly and assembly are completed.


3. Estimation method:

For the repair of more complex or expensive parts, it can be comprehensively converted according to 0.3–0.5 times the price of new parts.

Dacromet technology–epoch-making process of surface treatment

china anodizing services

Dacromet is named zinc-chromium coating in China. It is a new type of anticorrosive coating with zinc powder, aluminum powder, chromic acid and deionized water as the main ingredients.

    Dakro (also known as Dak Rust, Zinc Chrome Film, Dakman, etc.), which is a flake zinc-based road salt micro-coating metal anti-corrosion coating, is a high-tech of surface treatment in the world today, and has been praised by experts as international An epoch-making revolutionary product in the surface treatment industry. Steel Dakman technology is currently blank in China.

    Dacromet coatings have multiple properties. Such as extremely strong corrosion resistance: 7-10 times higher than electroplated zinc; no hydrogen embrittlement: especially suitable for high strength parts; high heat resistance: heat resistance temperature of 300 ℃. Particularly suitable for high strength components of motorcycle engine parts. In addition, it also has the advantages of high permeability, high adhesion, high friction reduction, high weather resistance, high chemical stability and no environmental pollution.

    The range of base materials suitable for Dacromet technology: steel products and non-ferrous metals such as aluminum, magnesium and their alloys, copper, nickel, zinc and their alloys.

    Dacromet surface treatment can replace a variety of surface protection processes such as galvanizing, cadmium plating, hot-dip galvanizing, hot-dip galvanizing, mechanical galvanizing, zinc-based alloy coating, anodizing service, and phosphating. Excellent to prevent the occurrence of environmental pollution.

    Chromium-free zinc-aluminum coatings have achieved a handful of industrialized products, such as Geomet coatings launched by the American MCI company, Delta coatings launched by the German Delta company, and other brands. There are also water-based chromium-free zinc-aluminum coatings in China. At present, Geomet’s main markets are the United States and Japan; Delta’s main markets are Europe and parts of Asia; BNC’s main markets are Western Europe and Taiwan. The three coatings basically account for more than 95% of the chromium-free Dacromet market in the world.

    Dacromet metal surface treatment method was first born in the 1950s. In cold North America and Northern Europe in winter, due to snow, the thick ice layer on the road severely hinders motor vehicles. People use the method of spreading salt on the ground to lower the temperature of the freezing point of water, dissolve the ice layer, and alleviate the problem of unblocked roads. But then, the chloride ions in the salt have seriously eroded the steel body, causing a lot of transportation damage and damage To destruction. Therefore, how to protect expensive traveling tools such as cars has become a serious problem facing manufacturers.

    In order to solve this problem, DiamondShamrock Company developed the Golden Cross metal with excellent salt damage resistance, and then developed the Dacromet coating with very thin film thickness for metal parts. In 1973, the company established Nippon.Darro.shamrock (NDS) in a joint venture with Nippon Oil Co., Ltd., and established DACKAL in Europe and France in 1976. They divided the world market into the Asia-Pacific, Europe-Africa and Americas. Markets, each in charge of a region, seek common interests on a global scale.