In addition to high requirements in the production process of precision mold processing, the selection of raw materials, specification design, processing, precision, size and other related matters should be kept perfect. The process of precision die processing must use high precision processing technology to form the required shape specifications. What are the specific requirements and characteristics of precision die processing? The following metal stamping manufacturers will take you to understand.
Six requirements for precision mold processing and molding.
1. The specifications of the products are of high precision and the size tolerance is small, which has high precision specification limits;
two, the repeated precision of the product standard is high, to have a day. Month and year size reliability;
three, the material of mold shell is good, the stiffness is sufficient. Precision of shape dimension of die. Smoothness and high accuracy between templates;
four, choose a high precision plastic machine to replace the basic plastic machine;
five, choose high precision forming processing technology;
six, select into the raw materials of high precision forming.
The focus of precision die processing must be on precision. The dimensional tolerance of precision molds is required to be higher, generally +/ -- 0.005. Many precision die main specifications do not allow for slope. Generally speaking, in the mold production will be flexible use of tolerance grade and small inclination, such as transmission gear installation cylinder, etc. In the design of precision mold drawings, processing operability and controllability should be considered to ensure the smooth processing.
Four characteristics of precision mold processing:
1, wear resistance
In the process of plastic deformation and deformation of the blank in the injection mold concave die, it flows along the surface of the cavity and rolls, resulting in intense friction between the surface of the cavity and the blank, which leads to the failure of the damaged abrasive. The corrosion resistance of the material is basically one of the important characteristics of the mold shell.
Strength is the main factor affecting wear resistance. Generally speaking, die parts have high strength, small wear rate and high wear resistance. The wear resistance is related to the type of cementite in the total data. Shape and size are relevant.
2. Strong ductility
Most die housings are operated to extreme standards, and some are subjected to high impact loads, leading to brittle fracture. In order to avoid brittle fracture of mold parts during work, high-precision hardware molds should have high hardness and ductility. The key to mold ductility is the carbon content of raw materials, grain size and structure -- precision mold manufacturing.
3, fatigue cracking characteristics
In the process of mold shell work, fatigue and rupture are usually caused by the prolonged action of the bad pressure. Its type has small kinetic energy repeated impact fatigue rupture. Lashen fatigue rupture contact fatigue rupture and bending fatigue rupture.
The fatigue cracking characteristic of mold shell is the key to its compressive strength. Ductility, strength, and the composition of sundries in its raw materials.
4, high temperature characteristics
When the die is operated at a high temperature, the strength and hardness will be reduced, leading to initial damage and ineffective plastic deformation of the die shell. , precision hardware die steel shall have high quench reliability to ensure high strength and compressive strength of the die housing at ambient temperature.