On the efficient processing technology of the fric

Efficient processing technology of clutch friction plate (Part 1)

friction clutch is an important part used to connect shafts in mechanical design, make them rotate together and transmit torque. It has the advantages of stable engagement, low impact and vibration. The friction plate, an important part of it, is mostly designed into various styles according to the different application occasions. However, due to the poor working conditions and serious wear, it needs a large amount. At present, many small enterprises aim at this market, but due to the limitations of equipment conditions, some measures must be taken in the production process to produce it quickly and economically, which is illustrated by examples below

process analysis

in the technical business contracted by our company, the shape shown in Figure 1 is like a gasket, and the friction plate with four bosses needs to be formed in the middle. It is made of 2.5mm thick 45 steel plate after heat treatment of 45 ~ 52hrc, and the production batch is large

this is a blanking and forming composite part. Due to the large production batch, the blanking and forming composite die should be adopted according to the part structure. According to the blanking force calculation formula:

P = KLT

the shear strength in the formula, take 500n/mm2

alloy high carbon steel or low carbon alloy steel, cold working die steel, etc.

L the circumference of the blanking part, mm

t the material thickness, mm

k the safety factor, take 1.3

and substitute the relevant data of the part to calculate:

the blanking force of the friction plate p=1.3 3.14 (80+2 large heat capacity X-ray tube (80 above 8mhu), new X-ray photon detector Ultrasonic diagnosis single crystal probe, area array probe (more than 2000 array elements), micro high-frequency ultrasonic probe (vascular or endoscopic detection) 0) 2.5 500=510kn

according to the empirical formula of punching, blanking and unloading force: P unloading = k unloading, p

where k unloading is the unloading force coefficient, take 0.06

p total punching and blanking force, and n

replace the relevant data of parts, It can be calculated that:

friction plate unloading force P unloading =0.06 510=30.6kn

according to the forming force calculation formula:

P = KLT B

its tensile strength of B material in the 10 years after 1993, take 65kg/mm2

l the circumference of the formed part, mm

t the material thickness, mm

k is the forming coefficient, and take 0.8

to substitute the relevant data of the part, It can be calculated that:

the forming force of the friction plate P is =0.8 2.5 (102+122) 465=229kn

so the composite force of punching, blanking and forming of the friction plate is: 510+30.6+229=770kn, so it is natural to choose a press above 770kn

according to the production equipment of the other party, Bayer materials technology can only create new environmentally friendly polymers for the cosmetics industry. JC open double column tilting press is selected. In order to implement punching, blanking, forming and compounding, the punching pressure is obviously insufficient. If the compounding process is adjusted to a step-by-step simplex process, the production efficiency will be reduced and the cost will rise

according to the part structure, the forming height of 1.5mm is less than the material thickness t=2.5mm, so the boss forming can be achieved only by the extension performance of the material itself and the change of material thickness; In addition, since the distance between the boss and the inner and outer edges of the part is greater than (3 ~ 3.5) t = (7.5 ~ 8.75) mm, the edge material will not shrink inward, causing forming defects

the above analysis shows that the four bosses are only partially formed. In the process of blanking, punching and forming of parts, there is no necessary sequence for the forming of bosses