A brief description of working principle of stamping die

 

 

Stamping die, also known as cold stamping die or hardware die, is a special process equipment used to process materials into parts in cold stamping. Its working principle is mainly based on stamping process, that is, at room temperature, die installed on press is used to apply pressure to material to separate or plastically deform it, thereby obtaining parts of desired shape. Specifically, working process of stamping die includes guiding of upper and lower dies, feeding and positioning of strip material, punch punching material to obtain workpiece, separation of workpiece and waste material, and ejection of workpiece. During this process, upper and lower dies of die are guided by guide pins and guide sleeves to ensure accuracy of stamping; strip material is fed into position through material blocking device to ensure accurate position of stamping; cooperation between punch and die realizes separation or plastic deformation of material; finally, workpiece and waste are taken out separately through top block and unloading plate and other devices to complete the entire stamping process. Stamping die is also called a hardware die; ‌Stamping dies are a special process equipment that processes materials (metal or non-metal) into parts (or semi-finished products) in cold stamping processing, called cold stamping dies (commonly known as cold stamping dies). Stamping is a pressure processing method that uses a die installed on a press to apply pressure to material at room temperature to separate or plastically deform it, thereby obtaining required parts.

 

Wide range of applications of stamping dies:
‌Automobile manufacturing‌: Processing of key components such as body, chassis, and engine cannot be separated from stamping dies to ensure accuracy and consistency of parts.
‌Home appliance industry‌: Outer shell and internal structure of refrigerators, washing machines, televisions, etc. are often processed by stamping dies to improve production efficiency and make appearance more beautiful and durable.
‌Electronic equipment‌: Metal shells, screen brackets and other parts of products such as smartphones and tablets need to be accurately processed by stamping dies.
‌Hardware products and medical devices‌: Manufacturing of products such as door locks, pliers, and surgical instruments also cannot be separated from support of stamping dies.
‌Other fields‌: Stamping dies are also widely used in aerospace, aviation, military industry, machinery, agricultural machinery, railways, post and telecommunications, transportation, chemical industry and other fields.

 

As an efficient and precise manufacturing technology, stamping dies play a vital role in manufacturing industry. From high-end fields to daily life, stamping parts processing is everywhere and is closely related to everyone's life. Stamping dies are important process equipment in manufacturing industry. There are various ways to classify them, mainly including following:
‌Classification by process properties‌: 1. Blanking dies‌: Such as blanking dies, punching dies, etc., to separate materials. 2. Bending dies‌: to bend and deform materials. 3. Drawing dies‌: to make open hollow parts or change their shape. 4. Forming dies‌: such as bulging dies, shrinking dies, etc., to make local plastic deformation of materials. 5. Riveting mold: rivet different products together.
‌Classification by structural characteristics: 1. Single process mold: only one process is completed at a time. 2. Compound mold: more than two processes are completed at a time with high precision. 3. Continuous mold: multiple processes are completed at different positions in one stroke with high efficiency.
In addition, stamping dies can also be classified according to aspects such as mold materials. Different types of molds play their respective roles in manufacturing process, meet needs of different industries and products.

 

Methods for inspecting automobile stamping die parts

1. Touch inspection: Wipe surface of outer cover with clean gauze. Inspector needs to wear touch gloves and touch surface of stamping part closely along longitudinal direction of stamping part. This inspection method depends on experience of inspector. If necessary, suspected area can be polished with an oil stone and verified, but this method is still an effective and quick inspection method.

 

 

2. Oiling inspection: Use clean gauze to clean surface of outer cover. Then use a clean brush to evenly apply oil to the entire outer surface of stamping in same direction. Put stamping after oiling under strong light for inspection. It is recommended to put stamping upright on the body. This method can easily find tiny pitting, depressions, and ripples on stamping.

3. Polishing of flexible gauze: Use clean gauze to clean surface of outer cover. Use a flexible sand net to close to surface of stamping and polish it longitudinally to the entire surface. Any pitting and indentation will be easily found.

4. Oilstone grinding: 1) First, wipe surface of outer cover with a clean gauze, then grind it with an oilstone (20×20×100mm or larger). Use a relatively small oilstone to grind arc and hard-to-reach places (for example: 8×100mm semi-circular oilstone) 2) Choice of oilstone particle size depends on the surface condition (such as roughness, galvanizing, etc.). It is recommended to use a fine-grained oilstone. Direction of oilstone grinding is basically along longitudinal direction, and it fits the surface of stamping part very well. Some special places can also be supplemented with horizontal grinding.

5. Visual inspection: Visual inspection is mainly used to find abnormal appearance and macro defects of stamping parts.

6. Inspection fixture inspection: Put stamping parts into inspection fixture, and inspect Nanpi stamping parts according to operating requirements of inspection fixture manual.
‌Material cost‌: Calculate required material costs based on mold size, material type (such as SKD11, Cr12MoV, etc.) and density. Including mold plates, punches, inserts, etc., but does not include standard parts and other spare parts.

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Processing costs‌: Covers costs of milling planes, milling six grinding two, grinding and other processing processes, calculated based on processing area and unit price.

‌Other costs‌: Including process design fees, assembly and debugging fees, packaging and transportation fees, and value-added tax paid. In addition, for product quotations, factors such as raw material costs, scrap income, machine loss, labor costs, management fees, required profits, packaging fees, transportation fees, mold sharing fees and value-added tax need to be considered.

In summary, cost calculation of stamping dies is a complex process that requires comprehensive consideration of multiple factors. By accurately calculating various costs, an accurate quotation for mold can be obtained.