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How to prevent deformation during slow wire processing

 Slow-moving wire processing is a very exquisite and exquisite craft, and sufficient preparations need to be made, so that the processed products can be more quality. The slow-moving wire processing technology has a wide range of applications and is a must in our industries. If you want to do better with less technology, you must master all aspects of the processing knowledge. For example, the most common thing is the deformation during processing.  How can we solve it How to prevent deformation during slow wire processing Speaking of slow wire processing, it uses continuously moving fine metal wires as electrodes. Pulse spark discharge is performed on the workpiece, where it generates a high temperature above 6000 degrees. Moreover, if it wants to improve its quality problems and prevent its deformation, it can firstly start from the following aspects. 1. To prevent deformation, it is impossible for the material to have no internal stress. In particular, the internal stress of the que

KOVAR parts seal preparation and physical properties

Kovar® is a vacuum-melted iron-nickel-cobalt low-expansion alloy. The chemical composition content is controlled in a very narrow range to ensure accurate and balanced thermal expansion performance. At the same time, strict quality control during the manufacturing process of KOVAR machining parts also ensures balance Its physical and mechanical properties are more suitable for deep drawing, stamping and various cutting processes. Material use Kovar® is used for vacuum sealing of hard glass and ceramics, and is widely used in electron tubes, microwave tubes, transistors and diodes. On integrated circuits, it is used for flat integrated circuits and dual in-line packages. Seal preparation All parts made by Kovar® should be degassed and annealed in a wet hydrogen atmosphere. Hydrogen is injected into water at room temperature and gets wet through blisters. Care must be taken to prevent surface carbonization. The heat treatment furnace must have a cooling chamber that provides the same a

What are the rules for metal stamping die scrap tube?

The Purpose Standardize the management of the scrapping of the company's metal stamping dies, prevent the loss of company assets, and formulate this system specially. Scope of application It is suitable for the management of the company's scrap molds. Definition If the molds listed in the assets of the company fall under one of the following circumstances, the use management department may apply for scrapping. 1. Molds that exceed the specified service life. 2. The mold is severely damaged by accidents or accidents, and molds that cannot be repaired or have no repair value. 3. Metal stamping dies that have not reached the service life, but due to safety, quality, efficiency and other issues, the repair still fails to meet the minimum requirements of the customer's product process or affects the production safety and efficiency. 4. Product customers have stopped placing orders or have not placed orders for molds in several years. 4. Responsibilities 1. Responsibilities of th

Heat treatment process of plastic mold parts

Different types of steel are used as plastic molds, and their chemical composition and mechanical properties are different, so plastic cnc machining routes are different; similarly, different types of plastic mold steels use different heat treatment processes. This section mainly introduces the manufacturing process route and the characteristics of the heat treatment process of the plastic mold.

1. Explanation of heat treatment terms

1. Annealing
(1) Concept: The heat treatment process of heating steel to an appropriate temperature, keeping it for a certain period of time, and then slowly cooling (usually cooling with the furnace).
(2) Purpose:
a. Increase the hardness of low steel to increase its plasticity (to facilitate cutting);
b. Refine the grains, and even the structure and composition of the steel;
c. Eliminate residual internal stress in cnc laser plastic cutting steel to prevent deformation and cracking
(3) Classification: complete annealing; spheroidizing annealing; stress relief annealing
2. Normalizing
(1) Concept: The process method of heating steel to 30~500C above Ac3 or ACcm, holding it for an appropriate time, and cooling it in air.
(2) Purpose: It is basically the same as the purpose of annealing, but the normalizing cooling rate is slightly faster than annealing, so the pearlite structure obtained after normalizing is relatively fine, and the strength and hardness are higher than that of annealed steel.
Normalizing has a shorter production cycle than annealing and has low cost and easy operation. Therefore, normalizing is preferred under possible conditions, but annealing should be used for complex parts.
3. Quenching
(1) Concept: The heat treatment process of heating steel to a certain temperature above Ac3 or Ac1, holding it for a certain period of time, and then cooling at an appropriate speed to obtain martensite or bainite structure.
(2) Purpose: In order to obtain martensite, improve the strength and hardness of steel.
4. Tempering
(1) Concept: a heat treatment process in which the quenched steel is heated to a temperature below the Ac1 point, held for a certain period of time, and then cooled to room temperature.
(2) Purpose:
a. Eliminate internal stress;
b. Obtain the required mechanical properties (improve the toughness of the steel, appropriately adjust the strength and hardness of the steel);
c. Stable organization and size

2. Process route of cnc plastic moulding

1. Low-carbon steel and low-carbon alloy steel molds
For example, the process route of 20, 20Cr, 20CrMnTi and other steels is: blanking→forging die blank→annealing→mechanical rough machining→cold extrusion forming→recrystallization annealing→mechanical finishing→carburizing→quenching, tempering→grinding and polishing →Assemble.
2. High-alloy carburized steel mold
For example, the process route of 12CrNi3A and 12CrNi4A steel is: blanking→forging die blank→normalizing and high temperature tempering→mechanical rough machining→high temperature tempering→finishing→carburizing→quenching and tempering→grinding and polishing→assembly.
3. Quenched and tempered steel mold
For example, the process route of 45, 40Cr and other steels is: blanking→forging die blanks→annealing→mechanical rough machining→tempering and tempering→mechanical finishing→dressing, polishing→assembly.
4. Carbon tool steel and alloy tool steel molds
For example, the process route of T7A~T10A, CrWMn, 9SiCr and other steels is: blanking → forging into die blank → spheroidizing annealing → mechanical rough machining → stress relief annealing → mechanical semi-finishing → fine cnc machined parts → quenching, tempering → Grinding and polishing → assembly.
5. Pre-hardened steel mold
For example, 5NiSiCa, 3Cr2Mo (P20) and other steels. For those directly processed with bar stocks, they have been pre-hardened due to the supply status, and can be directly processed and formed, then polished and assembled. For those that need to be forged into blanks and then processed into forming, the process route is: blanking→forging→spheroidizing annealing→planing or milling six sides→pre-hardening treatment (34~42HRC)→mechanical roughing→stress relief annealing→ Mechanical finishing → polishing → assembly.

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