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Setting blanking technology and blanking die stamping die design clearance values

Source:This websiteClick: Time:2014-08-13

Clearance of hedge cutting parts, blanking force, die life has a great influence. But it is difficult to find a fixed interval value can meet the best quality of blanking pieces at the same time, the die life expectancy, blanking force, the smallest and so on various aspects of requirements. Therefore, in actual production of the stamping, the main section of blanking pieces based on quality, dimensional accuracy and die life considering the three factors, give a range value clearance regulations. As long as the gap in this range, blanking pieces can get qualified quality and longer die life. The interval range is called a reasonable interval, the range of reasonable minimum value is called the minimum clearance (Zmin), known as the biggest reasonable maximum clearance (Zmax). Considering the wear in the production process makes the gap bigger, so the design and manufacture the new mould should be used when the minimum Zmin reasonable clearance. To determine the reasonable gap value, which has two kinds of theory and experience to determine method. 

 

1. The theoretical method is determined 

 

Mainly based on the convex and concave die cracking edge superposition principle to calculate. Figure 2.3.2 for blanking process of transient state started to crack, diagram based on geometric relations of Z for reasonable clearance can be obtained 

Figure 2.3.1 blanking die clearance 

 

Figure 2.3.2 blanking cracks on transient condition 

 

Z type can see, reasonable clearance and material thickness t, punch relative in depth, the Angle of crack, and and related to the material of plastic, see table 2.3.1. Therefore, the main factors influencing the clearance value is the material properties and thickness. The greater the material thickness, the lower the plasticity of hard brittle materials, the greater the gap Z values for; Material thickness of the thinner, the more plastic material, the clearance of Z values for the less. Due to the theoretical calculation method used in the production is not convenient, so the current widely used is the empirical data. 

 

2. Experience to determine method 

 

According to the research and the actual production experience, the clearance value classification look-up table as required. For dimensional accuracy, high quality demand of cross section of the blanking parts should choose smaller gap value 2.3.2 (table), the cutting force and the die life as a secondary factor. For dimensional precision blanking pieces and cross section quality requirement is not high, in meet the requirements under the premise of blanking pieces, should give priority to in order to reduce the cutting force, improve die life, choose the larger double gap value (table 2.3.3). Can see the GB/T16743-1997. 

 

It should be pointed out that, when the mould adopts the wire-cutting processing, if be obtained directly from the concave die punch, convex and concave die clearance at this time depends on the wire electrode diameter, discharge gap and grinding capacity, but its total no more than single biggest initial clearance value. 2.3.2 (table). Can see the GB/T 16743-1997. 

Note: 

 

1. The initial clearance minimum value is equal to the clearance of the nominal value. 

 

A maximum of 2. The initial gap is considering the punch and die manufacturing tolerance adds value. 

 

3. In use process, because the working parts of chess sets of wear, clearance will be increased, and the use of the maximum clearance will be more than table column values. 

 

4. For the carbon mass fraction, expressed in the carbon content in steel. 

 

Note: blanking and cardboard, leather, asbestos clearance take 25% of the 08 steel. 

 

It should be pointed out that, when the mould adopts the wire-cutting processing, if be obtained directly from the concave die punch, convex and concave die clearance at this time depends on the wire electrode diameter, discharge gap and grinding capacity, but its total no more than single biggest initial clearance value. 

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