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01

2024

Narrow standard parts

Narrow standard parts are standardized fasteners, which are actually a kind of connecting parts (connectors), but because of a wide variety of applications, they are only used in actual use, or even referred to as standard parts for short. It usually includes the following 12 types of parts: 1. Bolt: A type of fastener composed of two parts: head and screw (cylinder with external thread). It needs to be matched with nut to fasten and connect two parts with through holes. This type of connection is called bolt connection. If the nut is unscrewed from the bolt, the two parts can be separated, so the bolt connection is a detachable connection. 2. Stud: no head, only a type of fastener with external threads at both ends. When connecting, one end of it must be screwed into a part with an internal thread hole, and the other end must pass through a part with a through hole, and then screw on a nut, even if the two parts are fastened and connected into a whole. This type of connection is called a stud connection and is also a detachable connection. It is mainly used for occasions where one of the connected parts has a large thickness, requires a compact structure, or is not suitable for bolt connection due to frequent disassembly.

01

2024

Introduction of standard parts

Is a clear standard of mechanical parts (parts) and components, (the use of standards mainly China National Standard (GB), the American Society of Mechanical Engineers standard (ANSI /ASME), other Japan (JIS), Germany (DIN) and other standards are also widely used in the world. Mechanical parts and components with a high degree of standardization and strong industry versatility are also called universal parts. Generalized standard parts include fasteners, links, transmission parts, seals, hydraulic components, pneumatic components, bearings, springs, etc., all of which have corresponding national standards and have strong cross-industry versatility.

01

2024

Discussion on the Development Situation of Domestic Fastener Market

Fasteners, commonly known as screws and nuts, are basic mechanical parts and are known as the "rice of industry". They range from space shuttles, automobiles and mechanical equipment to tables, chairs and benches. This industry is a labor-intensive, capital-intensive and high-tech strategic industry, and all countries in the world attach great importance to its development. After years of development, China has developed into the world's largest fastener producer. It is reported that at present, there are nearly 10000 fastener production and trading enterprises in China, with more than 100 million employees, making a high contribution to employment. Domestic production of carbon steel fasteners are mainly used in the automotive industry, electronic products, electronic equipment, mechanical equipment, construction and general industrial purposes. Disadvantages: In recent years, for the fastener industry such a large pollution, high energy consumption of enterprises, the government's attention and support is relatively weak, many fastener enterprises are forced to move out, the number of fastener enterprises is relatively sharp decline. Advantages: The fastener industry started as the earlier of the three major industrial bases. After years of accumulation, coupled with a series of difficulties encountered in recent years, fastener companies have realized the importance of brand and image.

01

2024

How to realize the high precision manufacturing of powder metallurgy parts

To achieve high-precision manufacturing of powder metallurgy parts, the following aspects can be considered: 1. Powder selection and preparation: Select powder raw materials with high purity and uniform particle size, and adopt appropriate powder preparation methods to ensure the quality and consistency of the powder. 2. Mold design and manufacturing: carefully design the mold, taking into account the shrinkage rate, demoulding angle and other factors to ensure the dimensional accuracy of the parts. Use high-precision processing equipment and technology to manufacture molds. 3. Pressing process control: control the pressure, temperature and time and other parameters in the pressing process to obtain uniform density and dimensional accuracy. Adopt advanced pressing equipment and processes, such as isostatic pressing, hot isostatic pressing, etc.

01

2024

Synchronizer car

Nowadays, for cars equipped with synchronizers, the operation is simple, only need: 1. Step on the clutch; 2. Return the gear to neutral, and then push to the gear to be changed; 3. Release the clutch. [It should be noted that when a car is shifting between forward gear and reverse gear, the brake must be used to shift and release the clutch after the car has stopped, otherwise it will damage the transmission equipment.] On old cars, when there is no synchronizer, the following steps should be performed for the car to shift gears: 1. Depress the clutch; 2. Return the gear to neutral; 3. Release the clutch and then step on the clutch; 4. Gear Push to the gear to be changed; 5. Release the clutch, otherwise it will be difficult to shift gears and hear the sound of gears when shifting gears.

01

2024

Introduction of car synchronizer

There is a very important device inside the structure of the manual transmission, which is the "synchronizer". The role of the synchronizer is very obvious, that is, when shifting gears, because the speed of the power output gear is faster than the gear that is about to be shifted into this gear, it solves the problem of the engine speed and the gearbox speed during the shifting operation of the car. The mechanical device can effectively avoid being unable to engage the gear, eliminate the gear noise during shifting, etc. If there is no synchronizer, force a slow-rotating gear into a high-speed rotating gear, the phenomenon of tooth beating will definitely occur.

01

2024

Application Scenarios of Powder Metallurgy

Powder metallurgy related enterprises are mainly suitable for the production and research of spare parts in the automotive industry, equipment manufacturing industry, metal industry, aerospace, military industry, instrumentation, hardware tools, electronic appliances and other fields, the production of related raw materials and auxiliary materials, and the manufacture of various powder preparation equipment and sintering equipment. Products include bearings, gears, carbide tools, molds, friction products and so on. In military enterprises, heavy weapons and equipment such as armor-piercing shells, torpedoes, aircraft tanks and other brake pairs need to be produced by powder metallurgy technology. In recent years, powder metallurgy auto parts have become the largest market for China's powder metallurgy industry, and about 50% of auto parts are powder metallurgy parts.

01

2024

Powder metallurgy preparation method

(1) Production of powder. The production process of powder includes the preparation of powder, powder mixing and other steps. In order to improve the formability and plasticity of the powder, plasticizers such as engine oil, rubber or paraffin are usually added. (2) Press forming. The powder is pressed into the desired shape at a pressure of 15-600MPa. (3) sintering. It is carried out in a high-temperature furnace or vacuum furnace under a protective atmosphere. Sintering is different from metal melting, where at least one element is still in the solid state. In the sintering process, powder particles become metallurgical products with certain porosity through a series of physical and chemical processes such as diffusion, recrystallization, welding, combination and dissolution. (4) Post-processing. In general, the sintered parts can be used directly. But for some dimensional requirements of high precision and high hardness, wear resistance of the parts but also for sintering post-treatment. Post-processing includes coiling, rolling, extrusion, quenching, surface quenching, oil immersion, and infiltration.

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