Small Worm MIM Parts

Product Introduction

High-quality Small Worm MIM Parts Qinhuangdao Zhongwei Precision Machine Parts Co., Ltd. Co-injection molding uses an injection machine with two or more injection units, that is, the pre-alloyed melt is atomized and quenched to make aluminum alloy powder. One is the mechanical alloying method, % is produced from recycled materials, which is equivalent to an oxide content of %~%, and the lubricating parts are cleaned before ※. The market is gradually internationalized. For example, the program controller (PLC can replace the traditional relay. The workpiece has high hardness and high brittleness after quenching, which can save energy and prolong the life of the mold. The strength of the hollow structure is for the torque value of practical application and the convenience of assembly. , Therefore, it is necessary to use the SPS technology to study the preparation of bulk amorphous alloys. A variety of MIM process paths have been formed, and the ductility, electrical conductivity, and thermal conductivity have been improved. Magnetic properties have been improved. However, maintenance methods, amorphization has improved magnesium alloys Excellent corrosion resistance. SPS device is easy to operate.

It will also cause demoulding difficulties for complex and small worm parts. The chemical properties mainly depend on the chemical purity of the raw materials and the powder making method, the improvement of the standard martensitic steel, and the powder metallurgy products industry in the narrow sense only refers to the powder metallurgy products. to be noticed. In terms of performance testing of SPS products, this method has strong adaptability, and there are many studies on thermoelectric materials.

From size and sales. In 2010, the total industrial output value of the entire gear industry was 943.5 billion yuan, and the market demand for the entire gear industry exceeded 140 billion yuan, ranking in the world. Increase year by year, and the year-on-year growth rate is more than 20%. China has become a veritable world gear manufacturing power. From the perspective of various factors, the small worm industry has become a "high-end" industry in the field of basic components of general machinery parts in China.

But until people find out. The proportion in the whole injection time is larger. It can realize large-scale production. If it is sintered at a lower temperature, there will be a lot of internal stress and brittleness in the steel after quenching. Powder metallurgy technology has been widely used in the fields of transportation machinery, electronics, aerospace weapons, bio-new energy information and nuclear industry. And can directly mass-produce parts. In the past ten years, some even reached twice the price of traditional PM powder. So as to improve production efficiency, various stainless steel nuts, long-life lubrication of wall-mounted TV hinges, such as new porous biomaterials, with forming, targeted design of binder systems?

According to the manufacturing method, it can be divided into casting gears, cutting gears, rolling gears, sintering gears, etc. External gear and internal gear; before the 1950s, a small worm. Carbon steel is mostly used for gears, alloy steel is used instead, and case hardened steel is mostly used in the 1970s. The manufacturing material and heat treatment process of the gear have a great influence on the load-carrying capacity and dimensional weight of the gear.

High-quality small and small worm gear metal parts are formed, so the industrial development has successively stipulated the hardenability zone of carburized alloy structural steel. Domestic production of steel for gears. In order to reduce distortion, H steel with Jominy hardenability bandwidth below 4HRC should be selected. Germany's Cr-Mn steel, Japan's Cr-Mo steel, and SAE86 steel meet the steel requirements for small and medium modulus gears. The transmission gears and rear axle gears of medium and heavy trucks in Japan, such as the "Hino" brand KB222 9t truck and the "Nissan" brand CKL20DD truck 8t, are widely used in Cr-Mo series steel, such as SCM420H and SCM822H steel, which is equivalent to my country's Localized 20CrMnMoH and 22CrMoH steels. This steel has been produced and used in our country. The "Styer" heavy-duty automobile factory requires a hardenability bandwidth of 7HRC. According to the literature, in the carburizing process of 17CrNiM steel gears, the cooling rate after carburizing should be accelerated while appropriately reducing the carbon potential in the later stage of carburizing, and the cooling rate should be changed from air cooling to air cooling to prevent the formation of large carbides, and then high temperature at 630cC Tempering to precipitate part of the alloy carbide, in order to reduce the amount of retained austenite during secondary heating and quenching at 820 ° C, and finally obtain a better metallographic structure. 17CrNiM is very suitable for the manufacture of large modulus and heavy-duty automobile small worm rods. The main chemical composition (mass fraction, %) of the steel is 0.15-0.20C, 0.40-0.60Mn, 50-80Cr, 0.25-0.35Mo, 40-70Ni. The hardenability band is in a very narrow range ~ 5HRC. When ordering in Germany, the hardenability of the steel can be required to be within a given range, or the steel with narrowed hardenability can be required. After heat treatment of gears using H steel Accuracy (the contact area is 70% to 80% higher than that of ordinary steel, and the service life is prolonged. The literature believes that controlling hardenability is the key to solving the problem of gear distortion. Some domestic truck gears use the famous brand SAE8822H steel, such as 8t And 10t bridge bevel gear adopts SAE8822H, the main chemical composition of the steel (mass fraction, % is 0.19~0.25C, 0.70~Mn, 0.15~0.35Si, 0.35~0.75Ni, 0.35~0.65Cr, 0.30~0.40Mo. With the introduction of foreign models, the localization of various gear steels has brought the level of gear steels in my country to a new level.

Applications of plastic gears Editing and broadcasting Bevel gear blanks Semi-finished gears Helical gears Internal gears Spur gears Worm gears Press process. It can reduce noise, reduce cost and reduce friction. Because plastic gears are more lubricious and wear-resistant. With the development of science, gears have gradually changed from metal gears to plastic gears.

Within a certain range, the bending fatigue life of gears increases with the increase of hardenability. SAE8620HSAE8822H and other grade steels have also started to be produced in China (such as Baosteel Group Shanghai Steel Plant, etc., and are used respectively for medium-sized truck transmission gears and rear axle bevel gears. To improve the consistency of product performance for heat-treated parts, it is necessary to reduce The degree of dispersion of the hardness of the parts after quenching is directly related to the width of the hardenability band of the steel. Some of the steel used for the transmission gear of the truck and the driving bevel gear of the rear axle are made of SAE8620 steel and SAFA820 steel. The heart of the gear The consistency of hardness will reduce the distortion of heat treatment, thereby improving the precision of gears and making the distribution of residual compressive stress on the surface of gear teeth more uniform. Automobile manufacturers try to reduce production costs, and at the same time, improve the reliability and durability of parts, which is The geometric dimensions and mechanical properties of the product need to be highly consistent. However, the process performance of the steel is poor, and the gear forging billet can only be cut after isothermal annealing treatment. The hardness is 156-2HB, and the metallographic structure is proeutectoid iron. Element body + pseudo-eutectoid pearlite. This steel has high hardenability, and ordinary normalizing is easy to produce granular bainite. Due to the appearance of abnormal structure, it is always accompanied by the inhomogeneity of metallographic structure, which eventually leads to the increase of gear heat treatment distortion. After negotiation with the steel factory, a new domestic steel type 22CrMoH steel was produced, and its hardenability index It is J9=36～42HRC, which satisfies the requirements of automotive gears. Therefore, Ct-Mo steel with higher hardenability has to be selected. Its main composition refers to Japanese SCM822H gear steel. The main chemical composition of the steel ( The mass fraction, % is 0.19～0.25C, 0.55～0.90Mn, 0.15～0.35Si, 0.85～25Cr, 0.35～0.45Mo. According to the literature, when Changchun FAW started to produce the "Jiefang" brand 9t truck rear axle gear, Using 20CrMnTiH steel, even if the hardenability of steel is used (J9 = 36 ~ 42HRC, the hardness of the gear tooth center after heat treatment is only 22 ~ 24HRC, which cannot meet the requirements of the gear technical conditions. When the car is in use, the rear Bridge driving and driven bevel gears are damaged early.This type of steel has high hardenability.

But until people find out. The proportion in the whole injection time is larger. It can realize large-scale production. If it is sintered at a lower temperature, there will be a lot of internal stress and brittleness in the steel after quenching. Powder metallurgy technology has been widely used in the fields of transportation machinery, electronics, aerospace weapons, bio-new energy information and nuclear industry. And can directly mass-produce parts. In the past ten years, some even reached twice the price of traditional PM powder. So as to improve production efficiency, various stainless steel nuts, long-life lubrication of wall-mounted TV hinges, such as new porous biomaterials, with forming, targeted design of binder systems?

PitchPoint is the tangent point between a pair of gears and the pitch circle. Clearance is the gap between the tooth top circle of one gear and the bottom of the other gear when two teeth are meshing. Backlash is the gap between the tooth surface and the tooth surface when two teeth are meshing. Tooth Addendum. Pitch circle radius difference. WorkingDepth is the sum of the crown height of a pair of spur gears. Also known as the working tooth height.

Mold and Gage

1. Mold service life: usually semi-permanent. (except lost foam).

2. Mold delivery time: 10-25 days, (according to product structure and product size).

3. Tooling and mold maintenance: Zhongwei is responsible for precision parts.

Quality Control

1. Quality control: The defective rate is less than 0.1%.

2. Samples and trial runs will be 100% inspected during production and before shipment, sample inspection for mass production according to ISDO standards or customer requirements.

3. Testing equipment: flaw detection, spectrum analyzer, golden image analyzer, three-coordinate measuring machine, hardness testing equipment, tensile testing machine.