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The deformation of the forged crankshaft balance weight is due to the significant change in the axial size of the balance weight. After the machine is added, the thickness of the balance weight is uneven, which is easy to cause the problem of unable to move and balance. This obvious deformation mainly occurs in the cutting process. Due to the excessive cutting force, the cutting force on both sides is unbalanced.
More +Cold precision forging directly forges unheated metal materials, mainly including cold extrusion and cold head extrusion. Cold precision forging technology is more suitable for a variety of small batch production, mainly used to manufacture automobiles. Various parts and some tooth shaped parts of motorcycle.
Sawing and turning blanking are mainly used for aluminum alloy precision die forging, and sawing blanking is more commonly used. During precision die forging, crankshaft forging press, precision forging machine or other different equipment can be used for combined die forging. Repeated die forging for many times. Generally, the precision forging is 2-3 times after the ordinary die forging, up to ± 0.2~± 0.3mm, and the surface roughness is lower than Ra6.3. In order to achieve higher dimensions, the cold fine pressing on the fine press can reach ± 0.1mm, and the surface roughness is lower than Ra0.80.
Die forgings are called forging dies when using dies. During the working process, the corresponding die chamber of the forging die is used for deforming the metal to forming. The forging die is divided into upper and lower forging dies, which are respectively installed on the hammer head and anvil. With the help of dovetail and keyway, the forging die shall be prevented from falling off, loosening and lateral movement from left to right. The key block and wedge iron shall be used to fasten it in the dovetail groove of hammer head and dovetail groove of anvil to prevent the forging die from longitudinal movement from front to back.
During the production process of precision die forging, machining allowance shall be given to machined parts. For some important bearing parts, 100% sampling test or necessary process allowance is required for inspection and machining positioning. In the actual die forging production, due to the influence of various process factors, the actual size of the forging cannot be equal to the nominal size, and there will be deviations in both the height direction and the horizontal direction, so a certain deviation range is allowed for the forging. Forgings larger than the nominal size of forgings are positive tolerances, and forgings smaller than the nominal size of forgings are negative tolerances.
Preparation of blank: precision die forging requires high requirements for blank, small quality tolerance of blank, small collapse angle of section, flat end, straight to the axis of blank, and no pitting, cracks, pits, large scratches or bruises on the surface of blank; In addition, surface finishing (polishing, polishing, pickling, etc.) is required before forging, Remove the oil stain, slag inclusion, bruise and depression on the surface. Sawing and turning blanking are commonly used for aluminum alloy precision die forging, and band sawing blanking is more commonly used.
Dongguan Lianshengwang Precision Technology Co., Ltd
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Telephone： 0755-27269220 Phone： 139-2742-0442
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