JPH07115089B2 - Ironing drawing device - Google Patents

Description

The present invention relates to an ironing and drawing apparatus.

(Prior art and its problems) In normal ironing or ironing redrawing, the inner surface is pressed against the punch, but the irregularities on the inner surface caused by plastic deformation of the material generated during processing are removed. I can't. This unevenness requires post-processing such as re-polishing of the inner surface in products where not only dimensional accuracy of the inner surface such as a shock absorber but also minute unevenness poses a problem. This is often a serious obstacle to productivity.
It is an object of the present invention to provide a production apparatus that realizes high productivity and can reduce costs.

(Means for Solving Problems) The object is to provide a convex shape having an opening, abutting the outer surface of the object to be processed around the opening, and having a curvature along the sliding direction of the object to be processed. A die provided with an outer abutting portion, a punch that penetrates the opening of the die and pushes and pulls the object to be processed, slidably fitted to the punch and abutting on the inner surface of the object to be processed, and An ironing tool provided with a convex inner contact portion having a curvature along the sliding direction of the workpiece,
And an ironing drawing apparatus comprising a regulating means for regulating the transition of the ironing tool performed together with the punch at a position where the inner contact portion faces the outer contact portion via the object to be processed. .

(Effects of the Invention) When the squeezing process is performed according to the present invention, the dimensional accuracy of the inner surface is high, post-processing is not required, productivity is improved, and cost can be reduced. Further, when there is unevenness on the inner surface, in the product to which the internal pressure is applied, this minute unevenness is likely to trigger crack growth, and eliminating this unevenness improves the product quality, but according to the present invention, Since the unevenness is not scraped off by cutting or polishing, but smoothed with work hardening, the strength of the product can be further increased. This also leads to product weight reduction.

(Example) Hereinafter, the present invention will be described with reference to the drawings by taking an ironing redrawing as an example.

What has already been deep-drawn into a cylindrical container 6 is set on a die 5 as shown in the figure. The punch 1 and the inner side ironing tool 2 drop together, contact the container 6, and the ironing redrawing starts. When the punch is lowered to the position 1 ', the ironing tool 2 is in the state 2'and the falling is stopped by the support tool 3, and thereafter, the ironing of the container side wall is stably performed under the same condition. The punch continues to progress to the 1 ″ state, obtaining a squeezed container 6 ′ and completing the process.

The ironing of the inner surface of the container is performed by the convex ironing shoulder of the ironing tool 2 having a curvature along the sliding direction of the side surface of the container 6, and the ironing of the outer surface of the container is performed by sliding the side surface of the container 6 of the die 5. It is performed by a convex ironing shoulder having a curvature along the direction of motion.

It is possible to change the residual stress state of the side wall by adjusting the magnitude relationship between the radius of curvature R'of the ironing shoulder of the ironing tool on the inner side and the radius of curvature R of the shoulder of the ironing die. You can change and create the desired product.

Since the apparatus used in this embodiment is less likely to cause a trouble that the product adheres to the punch due to its structural characteristics, the lubricating oil can be applied to both the inside and outside surfaces. This gives great flexibility to the manufacturing method, and the present invention can be applied to a wide range.

[Brief description of drawings]

The figure is a plan sectional view for explaining the present invention. 1,1 ', 1 "... Punch, 2,2' ... Ironing tool, 3 ... Supporting tool, 5 ... Die, 6 ... Container.

Claims (1)

[Claims] 1. A die having an opening, a convex outer abutting portion abutting the outer surface of the object to be processed and having a curvature along the sliding direction of the object to be provided around the opening. A punch that moves through the opening of the die to push and pull the object to be machined, slidably fitted to the punch, abutting on the inner surface of the object to be machined, and sliding the object to be machined. The ironing tool provided with a convex inner abutting portion having a curvature along the moving direction, and the transition of the ironing tool performed together with the punch, the inner abutting portion through the object to be processed is the outer abutting portion. An ironing and drawing machine consisting of a regulating means that regulates at a position facing the contact part.