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OEM/EMD Stamping Mold From Wiesel

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What's Stamping Mold ?

Stamping mold is the process to exert pressure on the blank so that the blank will undergo steel transformation or separation to produce workpieces with fixed sizes, shapes and properties, stamping process can be divided into separating and forming.
Main two types of Stamping Mold:
  • Single Engineering Die 
  • Progressive Die ,Compound Die, Follow Die

 
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Single Engineering Die

The Die is good for a simple part and the quantity is not large.Normally, it includes the  below types:

Progressive Die

Progressive die stamping is a stamping method that utilizes a series of stations installed across a die set. Each station is designed and configured to perform a specific stamping operation on the workpiece and, once it is completed, automatically move it along to the next station. As the workpiece makes its way through the various stations, it progressively takes on the desired shape and size.
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Material For Stamping Mold Insert

The majority of materials used to manufacture stamping molds are steel, normally, material of mold working parts  include carbon tool steel, low-alloy tool steel, high carbon high chromium or medium chromium tool steel, medium carbon alloy steel, high-speed steel, base steel, as well as hard alloys, steel bonded hard alloys
  • Cr12
  • Cr12MoV
  • CrWMn
  • A3
  • T8
  • SKD11
  • SKH-9
  • DC53
  • ASP-23

Main die press components and safety requirements

Working components:
The convex and concave mold is the working part that directly makes the blank shape, therefore, it is the key part of the mold. The convex and concave mold is not only precise but also complex, it should meet the following requirements:
(1) It should have sufficient strength and cannot be broken or damaged during the stamping process;
(2) Appropriate requirements should be placed on its materials and heat treatment to prevent brittleness due to high hardness
Positioning components:
Positioning components are parts that determine the installation position of the blank. There are positioning dowel pins, stop pins, guide pins, guide bushings, fixed distance side knives, side presses, etc.

When designing positioning parts, you should consider the convenience of operation, there should be no positioning, and the position should be easy to observe. It is best to use forward positioning, outer profile positioning, and guiding pin positioning.
 Pressing, unloading, and discharging components:
The blanking parts include a blanking ring, blanking board, etc. The blank holder can exert pressure on the drawn blank, thereby preventing the blank from arching and forming wrinkles under the action of tangential pressure.
The function of the holding plate is to prevent the blank from moving and bouncing.
The function of the ejector and unloading plate is to facilitate the ejection of parts and the cleaning of waste. They are supported by springs, rubbers, and air cushion pushrods on the equipment, and can move up and down.
The ejector pins should have sufficient ejection force and the movement should be limited. The unloading board should minimize the closed area or mill an empty slot in the operating position.
The exposed unloading plate shall be surrounded by protective plates to prevent people from reaching out with fingers or foreign objects from entering, and the edges and corners of the exposed surface shall be blunt.
Guide components:
Guide bushings and guide pins are the most widely used guide components. Its function is to ensure that the convex and concave dies have a precise fit clearance during the stamping work.
Therefore, the gap between the guide bushing and the guide pin should be smaller than the blanking gap. The guide bushing is set on the lower mold base, and the upper-end surface of the guide pin is at least 5 to 10 mm above the top surface of the upper template at the bottom dead center of the stroke.
The guide bushing should be arranged far away from the module and the pressing plate so that the operator’s arm does not need to cross the guide bushing to feed and take materials.
Support pillar and mold clamp
It includes upper and lower templates, mold handles, fixed plates for convex and concave molds, backing plates, stoppers, mold clamp, etc. The upper and lower templates are the basic components of the die; various other components are installed and fixed on it.
The plane size of the template, especially the front and rear direction, should be compatible with the workpiece, too large or too small is not conducive to operation.
Some molds (blanking, punching molds) need to set up a backing plate under the mold base for the convenience of parting. At this time, it is better to connect the backing plate and the template with screws, and the thickness of the two backing plates should be absolutely equal.
The spacing of the backing plates shall be subject to the parts that can be delivered and should not be too large to prevent the template from breaking.
Fasteners:
It includes screws, nuts, springs, pins, washers, etc.Standard parts are generally used. There are a lot of standard components of stamping dies, and the design and selection should ensure the needs of tightening and elastic ejection, avoiding the fasteners from being exposed on the surface operation position, and preventing hand injury and hindering operation.

working of Progressive Die

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