Main parts of the hottest blanking die

The main parts and components of the punching die

first, the main parts and components of the punching die can be divided into two parts: process components and auxiliary components

generally, blanking dies are composed of the above six parts, but not all blanking dies must have these six parts. There are various structures of blanking dies. Some die structures are more complex than this die structure, while some die structures are very simple, which depends on the requirements of blanking workpiece, the size of production batch, mold making conditions and other factors. 2、 Punch: the structural form is mainly determined according to the shape and size of the blanking part

1. Circular punch

1 standard formula: divided into AB two forms

type B is suitable for punching mm aperture

a type is suitable for punching mm aperture

ensure the rigidity and strength of the punch, increase the transition section and adopt sliding transition

2 sheath type: punch structure, used for punching small holes (the aperture is close to the material thickness)

3 large blanking punch. It is fastened with socket screws or inlaid

the working part is made of die steel, and the non working part is made of general steel, which saves materials. The end is made into a concave shape to reduce the contact area with the work and prevent the unbalanced impact of paired plates caused by uneven ends. The side is made into a concave shape to prevent increasing the friction between the punch and the die and the work

2. Non circular punch: for complex blanking parts

the assembly part is made into a circle or square to facilitate assembly. The beginning of the working part is determined by the blanking part. If wire cutting is used, the beginning of the installation part is the same as the working part

3. Fixing method of punch

1 fix the plate with punch in a tight fitting form, and generally grind it flat after installation

2 it is directly connected with the upper template with screws, which is suitable for large punch

3 replaceable fixing form: it is suitable for punch that is easy to wear and damage

4 low melting point alloy and anti oxygen tree wax pouring and fixing method

use the cooling expansion characteristics of low melting point alloys, but the connection concentration is not high. The adhesion of oxygen resistant wax to the metal surface, but the scouring solubility is low

4. The length of the punch

l=h1 H2 H3 (10 ~ 20) mm, where

h1-- the thickness of the guide rule

h2-- the thickness of the discharge plate

h3 -- the thickness of the fixed plate of the punch

10 ~ 20mm-- including the coating degree of the punch extending into the concave die, the grinding amount and the distance between the discharge plate and the fixed plate of the punch when the die is closed

generally, blanking dies are composed of the above six parts, but not all blanking dies must have these six parts. The structure of blanking dies is diverse. Some dies are more complex than this die, while others are very simple. This depends on the growth rate of blanking workpiece, which is 39.99 percentage points higher than that in 2014, the requirements of production batch size, molding conditions and other factors. 2、 Punch: the structural form is mainly determined according to the shape and size of the blanking part

1. Circular punch

1 standard formula: divided into AB two forms

type B is suitable for punching mm aperture

a type is suitable for punching mm aperture

ensure the rigidity and strength of the punch, increase the transition section and adopt sliding transition

2 sheath type: punch structure is used to promote the further transformation and upgrading of the industry on the one hand, and on the other hand, it also improves the information exchange between our Taizhou Plastic Industry and the same industry in the country and even the world. Punching small holes (the aperture is close to the material thickness)

3 large blanking punch. It is fastened with socket screws or inlaid

the working part is made of die steel, and the non working part is made of general steel, which saves materials. The end is made into a concave shape to reduce the contact area with the work and prevent the unbalanced impact of paired plates caused by uneven ends. The side is made into a concave shape to prevent increasing the friction between the punch and the die and the work

2. Non circular punch: for complex blanking parts

the assembly part is made into a circle or square to facilitate assembly. The beginning of the working part is determined by the blanking part. If wire cutting is used, the beginning of the installation part is the same as the working part

3. Fixing method of punch

1 fix the plate with punch in a tight fitting form, and generally grind it flat after installation

2 it is directly connected with the upper template with screws, which is suitable for large punch

3 replaceable fixing form: it is suitable for punch that is easy to wear and damage

4 low melting point alloy and anti oxygen tree wax pouring and fixing method

use the cooling expansion characteristics of low melting point alloys, but the connection concentration is not high. The adhesion of oxygen resistant wax to the metal surface, but the scouring solubility is low

4. The length of the punch

l=h1 H2 H3 (10 ~ 20) mm, where

h1-- the thickness of the guide rule

h2-- the thickness of the discharge plate

h3 -- the thickness of the fixed plate of the punch

10 ~ 20mm-- including the coating degree of the punch extending into the concave die, the grinding amount and the distance between the discharge plate and the fixed plate of the punch when the die is closed

small die c= (1.) Ha

large die c= () hA

where HA is generally mm

C is generally mm

3. Determination of die size: ha= (mm)

where: P refers to the partial cutting force (n) A. if ha ＜ 10mm is calculated, ha=10mmb can be taken If the length of the part is greater than 50mm. When the die material is carbon tool steel, the calculation result should be multiplied by 1.3

4 to determine the edge size of the concave die. A) C 1.2 ha

b) C 1.5 ha

c) C 2.0 ha when the cutting edge wheel Guo line is a smooth curve C 1.5 ha

c) C 2.0 ha when the cutting edge is a complex beginning or included angle C 4. Convex concave die: it is a pair of plastic granulator system in composite blanking. The transformation of coal-fired furnace has become a special part of an important topic to be solved urgently. Its inner blade acts as a punching die, and its outer blade acts as a lifting punch. The shape is designed according to the punch, and the inner shape is designed according to the concave. The key of design is to ensure the wall thickness strength between the inner shape and the outer shape

1) the inner hole of the punch and die is designed according to the general concave mode, and the shape is designed according to the general punch

2) the key to design is how to ensure the strength of the wall thickness between the inner hole and the shape. The wall thickness is too thin and prone to cracking

3) methods to strengthen the strength of punch and die:

(1) increase the wall thickness outside the effective cutting edge

(2) adopt the composite die with positive installation structure to reduce the accumulation of waste materials in the die hole of the punch and concave die and reduce the pushing force

4) the key to the design of punch and die is to ensure a certain wall thickness between the inner shape and the outer shape, so that the punch and die have a certain depth

5) for convex and concave dies that do not accumulate waste. Its minimum wall thickness m is

when blanking hard materials, m=1.5t

when blanking weighing materials, m=t6). For the convex concave die with accumulated waste, its minimum wall thickness should be slightly larger to avoid shaking and damaging the inherent expansion force of relevant parts