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Do you know stamping dies ?

Stamping die is 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 the mold installed on the press to apply pressure to the material at room temperature to cause it to separate or plastic deform , so as to obtain the required parts .

1) The concept of stamping

Stamping is a forming processing method that relies on presses and dies to apply external forces to plates , strips , pipes and profiles , etc., so that they produce plastic deformation or separation , so as to obtain the required shape and size of workpieces (stamped parts) .

The stamped blanks are mainly hot-rolled and cold-rolled steel plates and strips .

2) Features of stamping

Compared with castings and forgings , stamping parts have the characteristics of thin , uniform , light and strong . Stamping can produce workpieces with stiffeners , ribs , undulations or flanges that are difficult to manufacture by other methods to improve their rigidity . High repeatability , consistent specifications , stable product quality . Stamped parts are generally no longer machined, or only a small amount of machining is required .

Stamping relies on the press and mold to complete the processing process , easy to operate , high production efficiency , the use of composite mold , is not to mention the multi-two-position progressive die , can complete the multi-pass punching sequence on the one-way press .

stamping dies
stamping dies

3) Classification of punching dies

Punching dies are also classified according to the nature of work , mold structure , and mold material .

According to the nature of the stamping dies process , it can be divided into :

a. Blanking die A mold that separates the material along a closed or open contour line . Such as blanking die , punching die , cutting die , cutting die , cutting die , cutting die , etc.

b. Bending die makes the sheet blank or other billet bend deformation along the straight line (bending line) , so as to obtain a mold of a certain angle and shape of the workpiece .

c. Deep drawing die is a mold that makes the sheet blank into an open hollow part , or makes the hollow part further change the shape and size .

d. Forming mold is a mold that directly copies and forms the blank or semi-finished workpieces according to the shape of the convex and concave mold , and the material itself only produces local plastic deformation . Such as expansion mold, shrinking die , flaring die , undulating forming die , flanging die , shaping die , etc .

e. Riveting mold is to borrow external force to make the participating parts connect or lap together in a certain order and way, and then form a whole .

According to the degree of stamping dies process combination , it can be divided into :

a. Single-process mold In one stroke of the press , only one stamping process is completed .

b. Composite mold There is only one station , and two or more stamping processes are completed at the same time in one stroke of the press .

c. Progressive die (also known as continuous die) In the feeding direction of the blank , there are two or more stations , and in one stroke of the press , two or more stamping processes are completed successively at different stations .

d. Transfer mold integrates the characteristics of single-process mold and progressive mold , and uses the manipulator transfer system to realize rapid in-mold transfer of products , which can greatly improve the production efficiency of products , reduce the production cost of products , save material costs , and the quality is stable and reliable .

According to the processing method of the product , it can be divided into :

According to the different stamping dies processing methods of the product , the mold can be divided into five categories : punching and shearing die , bending die , extraction die , forming die and compression die .

a. Punching and shearing die : the work is completed by shearing , and the commonly used forms are shearing die , blanking die , punching die , trimming die , whole edge die , drawing die and punching die .

b. Bending die : is to bend the flat blank into an angle shape , depending on the shape , accuracy and production of the part , there are a variety of different forms of mold , such as ordinary bending die , cam bending die , crimping die , arc bending die, bending punching die and twisting die .

c. Extraction mold : Extraction mold is to make a flat raw embryo into a seamless container with a bottom .

d. Forming mold : refers to the use of various local deformation methods to change the shape of the blank , the form of which includes convex forming die , crimping forming die , neck forming die , hole flange forming die , round edge forming die .

e. Compression mold : is the use of strong pressure , the metal blank flow deformation , into the required shape , its types are extrusion die , embossing die , stamping die , end stamping die .

stamping dies
stamping dies

4) The modernization of mold manufacturing technology is the basis for the development of the mold industry .

With the development of science and technology , advanced technologies such as computer technology , information technology , and automation technology are constantly penetrating , intersecting and integrating into traditional manufacturing technology , transforming them to form advanced manufacturing technology . The new stamping in-die tapping technology has led many stamping manufacturers to reduce costs and caused a rush to buy .

The development of advanced mold manufacturing technology is mainly reflected in :

Ordinary milling processing adopts low feed speed and large cutting data , while high-speed milling processing adopts high feed speed and small cutting data , high-speed milling processing has the following characteristics compared to ordinary milling processing :

a. High efficiency The spindle speed of high-speed milling is generally 15000 r/min~40000 r/min , and the maximum can reach 100000 r/min . When cutting steel , its cutting speed is about 400m/min , which is 5~10 times higher than traditional milling processing; When machining mold cavities , compared with traditional processing methods (traditional milling , EDM processing , etc.) , its efficiency is increased by 4~5 times .

b. High precision The accuracy of high-speed milling processing is generally 10μm , and some have higher precision .

c. High surface quality Due to the small temperature rise of the workpiece (about 3℃) during high-speed milling , there is no metamorphic layer and microcracks on the surface , and the thermal deformation is also small . The best surface roughness Ra is less than 1μm , which reduces the subsequent grinding and polishing workload .

d. Can process high hard materials can mill 50~54HRC steel , the highest hardness of milling can reach 60HRC .

In view of the above advantages of high-speed machining , high-speed machining is being widely used in mold manufacturing and gradually replacing partial grinding and electrical machining .

EDM (also known as EDM) is a major development in EDM technology , a new technology that replaces the traditional use of forming electrodes to machine mold cavities . Like CNC milling , EDM uses high-speed rotating rod electrodes to profile workpieces in 2D or 3D , eliminating the need to manufacture complex , expensive forming electrodes . The EDSCAN8E EDSCAN8E EDM machine launched by Mitsubishi Corporation of Japan is equipped with automatic compensation system for electrode loss , CAD/CAM integrated system, online automatic measurement system and dynamic simulation system , which reflects the level of today’s EDM machine tools .

The development level of CNC slow wire cutting technology has been quite high , the function is quite perfect , and the degree of automation has reached the degree of unattended operation . The maximum cutting speed has reached 300mm²/min , the processing accuracy can reach ±1.5μm , and the processing surface roughness is Ra0.1 ~ 0.2μm . The development of 0.03~0.1 mm diameter filament wire cutting technology can realize the one-time cutting of the concave and convex die , and can carry out the cutting of narrow groove of 0.04mm and fillet within a radius of 0.02mm . Taper cutting technology has been able to perform precision machining of more than 30° taper .

 Grinding and polishing processing are widely used in precision mold processing due to the characteristics of high precision , good surface quality and low surface roughness value . Precision mold manufacturing makes extensive use of advanced equipment and technologies such as CNC forming grinders , CNC optical curve grinders , CNC continuous trajectory coordinate grinders and automatic polishing machines .

The application of advanced mold manufacturing technology has changed the traditional mold-making technology , mold quality depends on human factors , not easy to control , so that mold quality depends on physical and chemical factors , the overall level is easy to control , mold reproduction ability is strong .

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