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Cold forging process and process classification
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- Time of issue:2021-09-02
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(Summary description)Cold forging technology belongs to volume plastic deformation at room temperature. Using the die installed on the press, under the action of a considerable unit extrusion force and a certain speed, the metal is plastically deformed in the die cavity, so that the blank becomes the desired Shape, size and parts with certain properties
冷锻工艺及工艺分类
Cold forging process and process classification
Cold forging process and process classification
(Summary description)Cold forging technology belongs to volume plastic deformation at room temperature. Using the die installed on the press, under the action of a considerable unit extrusion force and a certain speed, the metal is plastically deformed in the die cavity, so that the blank becomes the desired Shape, size and parts with certain properties
- Categories:Info-Center
- Author:
- Origin:
- Time of issue:2021-09-02
- Views:0
1. Cold forging process and characteristics
Cold forging technology belongs to volume plastic deformation at room temperature. Using the die installed on the press, under the action of a considerable unit extrusion force and a certain speed, the metal is plastically deformed in the die cavity, so that the blank becomes the desired Shape, size and parts with certain properties
2. Classification of forming process
01. Positive extrusion
During positive extrusion, the metal flow direction is the same as that of the punch. During processing, the blank is first placed in the concave die. There is a hole in the concave die that is equal to the outer diameter of the part, and then the punch is pressed to extrude the blank. The pressure of the punch causes the metal to enter into plastic deformation and forces the metal to flow out of the small holes of the die, thereby obtaining the part
02. Reverse extrusion
During back extrusion, the metal flow direction is opposite to the direction of movement of the punch. During processing, the flat or cylindrical blank is placed on the bottom of the die. When the punch applies pressure to the blank, the metal flows along the direction between the punch and the die. flow through the gap to make the desired hollow part.
03. Compound extrusion
During extrusion, the flow direction of a part of the metal is the same as the direction of movement of the punch, while the flow direction of another part of the metal is opposite to the movement direction of the punch, that is, during the extrusion process, the metal has more than two channels in the axial direction and flows.
04. Upsetting and extrusion compounding
During cold heading, the metal flow direction is perpendicular to the direction of movement of the punch, and the cross-sectional area of the cold heading workpiece is larger than the short area of the blank. During upsetting and extrusion, in addition to the same direction as the upsetting, there is also a part of the metal flowing in the same or opposite direction along the moving direction of the punch.
3. The composition of the cold forging die standard
The cold forging die standard currently in use consists of four parts, namely: JB/T 11901-2014 Technical Conditions for Cold Forging Dies; JB/T 7715 Technical Conditions for Cold Forging Dies; JB/T 5112 Cold Extrusion Prestressing Combination Die design specification; JB/T 9196 cold extrusion punch and die structure and size
4. Structure of cold forging die
01. Universal anti-extrusion die with guide post and guide sleeve guide
The unloading plate also has a guide, and its guiding benchmark is the mold guide column. During reverse extrusion, the end face of the extrusion part is often uneven. When the part is missing, the punch is unevenly stressed, which may cause the punch to be offset and broken. When the unloading plate is guided, the stability of the punch is improved. Due to the orientation of the material plate and the punch, the die set suitable for reverse extrusion can be used as both positive extrusion and compound extrusion.
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