Method and compression tool for producing highly dimensionally stable half shells

Abstract

The invention relates to a method for producing highly dimensionally stable, deep-drawn half shells (2, 42), which have a bottom region (3), a jacket (5), and optionally a flange (44), wherein a half shell (2, 42) pre-formed from a blank is shaped into a finished half shell, wherein the pre-formed half shell (2, 42) has excess blank material because of the geometric shape of the pre-formed half shell and wherein, because of the excess blank material, the half shell (2, 42) is compressed into the finally formed half shell in a compression tool during the shaping of the pre-formed half-shell into the final form of the half shell by means of at least one pressing process. The problem addressed by the invention is that of specifying a method and a device, by means of which the process reliability during the production of a half shell can be increased. The problem is solved by the previously mentioned method in that the size of the compression gap (38, 76) is reduced during the closing of the compression tool (4, 40) to the actual wall thickness of the jacket (5) of the pre-formed half shell. In addition, the problem is solved by a compression tool according to the invention in that two side walls (18, 20, 56, 58, 80, 82) are provided, which side walls form a die together with the bottom region (14, 54) of the mold (12, 52) of the second tool half (8, 48) and which side walls (18, 20, 56, 58, 80, 82) can be moved perpendicularly or obliquely to the direction of motion of the punch (10, 50).

Description

technical field [0001] The invention relates to a method for the production of deep-drawn half-shells with high dimensional accuracy, which have a base area and side frames and optionally flanges, wherein the half-shells prefabricated from blanks are formed into finished products Half-shells, in which the prefabricated half-shells have a stock allowance due to their geometrical shape and which undergo at least one forging operation in an upset forging plant during the formation of the finished half-shells from the prefabricated half-shells due to the stock allowance The half-shells are upset to form the finished half-shells. Furthermore, the invention relates to an upsetting plant for producing half-shells with high dimensional accuracy, said upsetting plant having at least a first plant half and a second plant half, the first plant half having an upsetting punch head, the shape of the upset punch corresponds to the inner contour of the finished half-shell, the second device ...

AI Technical Summary

Problems solved by technology

However, in actual production, the blank does not always have a uniform thickness, so there is a certain tolerance in the material thickness of the half-shell after the deep drawing process, at least in the side frame area

But in the above method, the half-shells with the above tolerances cannot be perfectly calibrated in their circumferential direction

Specifically, the flange area (if there is a flange) and the side frame area of ​​the upsetting material will have an undesired wrinkled shape during the upsetting process. Aspects reduce local dimensional accuracy

Furthermore, problems arise in the machining of half-shells with low springback due to the springback of the prefabricated half-shells and the resulting lower dimensional accuracy of the prefabricated half-shells

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