A cold shrink-expanding forming method of a rim body
A rim body and cold press forming technology, which is applied in the direction of forming tools, metal processing equipment, manufacturing tools, etc., can solve the problems of large dimensional error of rim body, complicated processing process, large tolerance error, etc., and achieve reduction of processing molds and processing surface Smooth, quality-enhancing effect
Active Publication Date: 2016-12-28
杭州润德车轮制造有限公司
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Problems solved by technology
The rim body formed by rolling has a large dimensional error, and a large shape and position tolerance error such as cylindricity and roundness. Therefore, it is necessary to add a shaping process to the workpiece to ensure that the size meets the requirements. The processing process is relatively complicated, time-consuming, laborious, and costly; and, Cracks are prone to occur at the welding seam of the workpiece during the rolling process, resulting in product defects and a high scrap rate
Method used
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Embodiment Construction
[0020] like figure 1 , 2 As shown, the cold forming die of the present invention includes: a die 1, whose inner peripheral wall has a profile that matches the designed rim body, and a supporting plate 11 is arranged at the inner bottom of the die 1; not shown in the figure) to move up and down, the bottom of the upper template 20 is fixedly connected with the basin-shaped inner mold 3 and the basin-shaped outer mold 4 surrounding the outside of the basin-shaped inner mold, and the basin-shaped inner mold 3 The outside of the bottom has a chamfer, and the bottom surface of the basin-shaped outer mold 4 is smoothly connected with the chamfer, and forms the same design as the rim body ( Figure 4 As shown) the shape of the large end basin shape; the center of the basin-shaped inner mold 3 is provided with a through hole 3a; the expansion form structure is connected with the upper template 20, and its outer peripheral wall and the inner peripheral wall of the die 1 form and desig...
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The invention discloses a cold contraction and expansion forming method for a rim base. The cold contraction and expansion forming method for the rim base is characterized by comprising the first step of rolling a cylindrical blank (9), the second step of placing the cylindrical blank (9) in a female die of a cold press molding die and adopting a male die assembly for bottom end performing and top end forming in sequence, and the third step of taking the cylindrical blank (9) out of the female die of the cold press molding die after the second step is carried out and placing the cylindrical blank (9) in a flanging die for flanging of the preformed bottom end. The small end and the big end of the rim base are formed through one cold press molding die, machining processes and machining dies are reduced, the production cost is lowered, and the size of the formed rim base is accurate.
Description
technical field [0001] The invention relates to a method for forming a rim body, in particular to a method for cold shrinking and expanding the rim body. Background technique [0002] There is a certain diameter at both ends of the rim body, the diameter mouth of the small end is conical and small-diameter cylindrical, and the large end is large conical and basin-shaped. For such a rim body with a relatively complex structure, the traditional processing method is to first press the top of the hollow cylinder blank into a basin shape, then heat the workpiece, and then place it in a special roll forming equipment for rolling. The rim body formed by rolling has large dimensional errors, and large shape and position tolerance errors such as cylindricity and roundness. Therefore, it is necessary to add a shaping process to the workpiece to ensure that the size meets the requirements. The processing process is relatively complicated, time-consuming, laborious, and costly; and, Cr...
Claims
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IPC IPC(8): B21D53/26B21D19/00B21D39/20
CPCB21D19/00B21D37/10B21D39/20B21D53/26
Inventor 许奇
Owner 杭州润德车轮制造有限公司