What are the fixed methods for the parts when the die is assembled?The following fixed methods are used.
- Mechanical fixation
Mechanical fixation is the method of applying mechanical force to a certain part, and the following are the following:
- Fastener fixation
Fasteners are parts that can be fixed mechanically, such as screws, bolts, pins, etc.This method is fixed, easy to disassemble, simple and convenient, is the most commonly used fixed method.Such as convex mode, core, cavity and so on.
- Press into fixed
For the parts that are overmatched, the pressure can be used to secure the parts.It is usually carried out on the pressure machine. It is necessary to pay attention to the amount of volume, surface roughness, the import of rounded corners and the Angle of import.The fixed characteristic is the connection is strong and reliable, but the precision of the compression type hole is higher.
- Riveting fixation
This is the method of using rivets to fix the parts.Or local percussion of the fixed plate type hole, the local material of the fixed plate is pushed to the center, and the shaft is fixed.This method is easy to operate, but not too much torque.
2.Physical fixation
Physical fixation method is a physical method to make the relevant parts to be fixed. There are several main methods:
- Thermal sheath fixation
This is right with a method for assembly, it is the type of hole parts are heated to a certain temperature, and make the inner hole wide, and set on the shaft, the shaft tightly after cooling pulls and fixed.This method is good for the neutral, but the operation is more trouble, the torque is less.
- Cold expansion fixation
This is to use some of the low melting point alloy condensing time volume expansion characteristics to tighten the parts.This method can reduce the adjustment of the position accuracy and clearance uniformity of the mold assembly, but its operation is more complicated.
3.Chemical fixation
Chemical fixation is used to bind the parts together with the bonding properties of certain chemicals.
- Adhesive fixation of epoxy resin
Epoxy resin of various metal and nonmetal surface adhesion is very strong, with high mechanical strength, small shrinkage rate, good chemical stability and good process performance, widely used in the mold assembly.When bonding, the adhesive part should be roughened to make it adhere firmly.The main disadvantage of epoxy adhesion is not high temperature and low hardness.
- Inorganic adhesion fixation
The inorganic adhesive is a mixture of phosphoric acid of aluminum hydroxide and copper oxide powder, which is used to adhere to the relevant parts.This method of adhesive is simple, not deformation, resistant to high temperature of 600 ?, but poor ability to withstand the impact, acid, alkali corrosion.
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