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Mold design The mold structure with reasonable mold structure can not only meet the quality requirements of the product, but also process, assembly and maintenance are very convenient, and the die life is high, which can meet the requirements of mass production. According to the process analysis, the summary of the field debugging experience and the mold repair process, we determined that the working part of the convex and concave die of the through hole shaping die adopts the die structure as shown in the figure. The punch is fixed between the fixing seat and the positioning block, and the upper and lower parts are required to be used in the forward and reverse directions, and the positioning block and the fixing base are bolted. The die is sleeved. Practice has proved that the convex and concave mold structure is reliable and easy to maintain.
Since the material of the mold is hardened by the turning, the blanking force and the turning hole shaping force are large, the material of the crimping ring of the main force component of the die is made of steel. In addition, in the process of turning the hole, due to the high strength, large contact area, high contact surface temperature, and a large amount of heat generated during the deformation process, and acting on the surface of the convex and concave mold in the form of thermal stress, the mold surface is changed and The contact property between the surfaces of the metal materials causes the metal to easily adhere to the surface of the mold 1 during the turning process to form a cemented tumor, thereby leaving marks of abrasion and napping on the surface of the material inside the oil seal hole. Therefore, the convex and concave mold material should be selected from the alloy tool steel and the hard alloy material which are different from the metal material 123. Considering the forming characteristics of the oil seal hole of the gear chamber cover, the punch material is made of tungsten-cobalt type hard alloy 45/, and the die material is made of alloy tool steel 6789:.
Reasonable mold gap In the process of turning hole shaping, if the gap between the convex and concave molds is large, wrinkles which are difficult to eliminate are prone to occur; if the gap between the convex and concave molds is small, the material is easily thinned, and the parts are easily cracked, and Increase frictional resistance and create mucosa, reducing mold life. During the boring process, the metal material is subjected to a large compressive stress in the direction of the plate thickness, and the change in the state of the compressive stress will improve the performance of the material. Moreover, since the punching direction is opposite to the direction of the turning hole, the burr is eliminated, the stress concentration is reduced, and the port portion is not easily cracked.
The precision of the oil seal hole of the gear chamber cover is high, and the selection of a reasonable mold gap is the key to ensure the forming. The turning of the gear chamber cover oil seal hole is different from the round hole flange which we often say, and it is also different from the thinned flange. It is a kind of hole flanging between the round hole flanging and the thin flanging edge. Therefore, the value of the turning die die gap can neither take the thickness of the round hole and indicate the material thickness. When thin flanging, it should be between. After long-term debugging practice, we take the unilateral gap of the convex and concave mold, that is, the main innovation point of this process scheme proposes a new process parameter of the tumbling die, that is, the die gap is taken to ensure the product requirements of the oil seal hole.
A new boring die structure is proposed. The advantage of the mold structure is that the upper and lower sides of the punch can be universal; the structure is reliable, and the gap of the convex and concave mold is easy to adjust, which is convenient for maintenance.
A new mold material was used. Considering the forming characteristics of the oil seal hole of the gear chamber cover, the punch material is made of tungsten-cobalt type hard alloy/0, and the die material is made of alloy tool steel.
Gear inner bottom oil cover promotes model engineering research