Characteristics and application fields of ceramic positioning pins

Release time：2024-09-11click：0

As far as we know, the function of the positioning pin is to limit the free movement of the item. Compared with traditional material positioning pins, the advanced ceramic materials used by Mingrui Ceramics Factory have greater advantages, such as zirconia ceramic positioning pins, alumina ceramic positioning pins, and silicon nitride positioning pins.

Ceramic positioning pin

There are 5 types of positioning pins: 1. Fixed positioning pin
. 3. Tapered positioning pin
Standard diamond-shaped positioning pin

The function of the positioning pin is to limit the free movement of the item. Degrees of freedom: Any object in space must have six degrees of freedom, linear motion in the three axes of X, Y, and Z, and rotational motion around X, Y, and Z. The positioning pin is the part that participates in limiting these degrees of freedom. In a mold consisting of two or more parts, a pin designed to accurately position two adjacent parts of the mold. In the spindle positioning, 1) mechanical cam mechanism (2) photoelectric disk method is used for rough positioning, and then a hydraulic or pneumatic positioning pin is inserted into the pin hole or pin groove on the spindle to achieve precise positioning. After the tool change is completed, the positioning pin exits , the spindle starts to rotate.

Ceramic positioning pins have extremely strong corrosion resistance and can be used in strong acids, strong alkali and sea water. At 1100°C, the strength and hardness are almost unchanged. It is non-magnetic and can be used in magnetic fields. Electrical insulation. The density is 3.25---3.28g/cm3, and it is light in weight, about 60% lighter than steel balls. It greatly reduces the centrifugal force on the groove when the bearing rotates at high speed and reduces wear. High rigidity and strength, its hardness is twice as high as bearing steel, and its elastic modulus is about 1/3 higher. The linear expansion coefficient is 3.2×10-6/K, which is almost 1/4 of bearing steel and can withstand rapid changes in temperature.

(1) Performance characteristics:
1. Ceramic positioning pins are similar to ordinary welding positioning pins, but are made of super-hard silicon nitride ceramic material. The special physical and chemical properties of ceramic materials determine some special properties of silicon nitride positioning pins.performance. For example, it has excellent properties such as high wear resistance, high hardness, non-electrical conductivity, non-magnetic conductivity, and non-adhesive welding slag.

2. Let me briefly introduce the properties of ceramic materials:

High hardness: The hardness of zirconia is second only to diamond
High wear resistance: High hardness and good red hardness determine the excellent wear resistance of zirconia positioning pins
High cost performance: The service life of zirconia positioning pins is more than 10 times that of ordinary positioning pins

Ceramic positioning pin

(2) Application fields:
Ceramic materials such as zirconium oxide and silicon nitride are high-temperature and wear-resistant. They are used as mechanical parts, such as rotors and stators in engines; hot-pressed piston tops, reaction sintering burners, spark plugs, cylinder liners and other precision parts; heat-resistant It has good shock resistance and can be used as thermowells, ceramic positioning pins, molds, crucibles, furnaces, burners, heating element fixtures, furnace linings, aluminum liquid conduits, valves, etc. It has good corrosion resistance and can be used as ball valves and seals in the chemical industry. Rings, filters, heat exchanger components, etc.; have good wear resistance and are used as bearing balls, rollers, races, high-temperature bolts, plunger pumps, sealing materials, etc. in the machinery industry; used in the electronics, military and nuclear industries Used as circuit substrates, film capacitors, high temperature insulators, radar radomes, isolation components, etc.