SU891265A1 - Method of basing blanks at mandrelling - Google Patents

Description

The invention relates to metalworking and can be used for burnishing holes in the bushings.

There is a method of basing a workpiece during burnishing, in which the workpiece is based on the outer diameter and the supporting end face on a support made in the form of a female cup [1].

However, with this design, because of the possibility of displacement of the axis of the workpiece, it occurs from below ^! the quality of the processed product.

The purpose of the invention is improving the quality of the product.

This goal is achieved by the fact that before the burnishing, the end of the workpiece is, on the one hand, subjected to distribution to an outer diameter equal to the outer diameter of the finished product, and use it as a supporting end.

This embodiment improves the quality of the product.

In FIG. 1 (a, b, c) shows the transitions that provide the finished product; on fs. 2 layout of the workpiece.

The blank 1 of the required length (Fig. 1A) is obtained by cutting from the pipe. Then, on the one hand, the end of the workpiece is subjected to distribution by any known method (Fig. 16) to an outer diameter equal to the outer diameter of the finished product (Fig. 1c). The height of the enlarged part of the workpiece 1 should be sufficient for centering in the guide hole of the support 2. In case of burnishing (Fig. 2), the workpiece 1 is inserted into the guide hole of the support 2 of diameter d _max to the stop 3 with hole 4. Thus, the workpiece 1 is based on outer diameter and abutment face. Next, the mandrel 5 lead the process of burnishing the workpiece 1, which is no different from conventional burnishing.

In laboratory conditions, an experiment was performed to burn out holes отверстия 57 + + 0.06 mm using the method of basing a 63 × 4 tube billet GOST 873475 380 mm long. Previously, one of the ends was subjected to distribution by a mandrel at a length of 50 mm to form holes of the same diameter. The calculation determines the diameter of the guide hole of the support according to the maximum dimensions of the finished product:

maximum internal diameter of the product d = 57.06 mm;

the maximum wall thickness of the finished product does not exceed the wall thickness of the workpiece according to GOST 8734–75 and is S = 4.4 mm, = d + 2S = 57.06 + 2 x 4.4 = 65.86 mm. DRANK

Analysis of the basing methods showed that in the proposed method, the radial error of centering is 2 times less than in the known one. This made it possible to reduce the diameter of the hole in the support, i.e. increase the area of the supporting surface.

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Claims (1)

Claim Technical and economic efficiency of the application of the method is due to an increase in the quality of finished products. A method of basing a workpiece in case of dornonium, in which basing of the workpiece on the outer diameter and the support highlander is performed on a support made in the form of an enclosing cup, characterized in that, in order to improve the quality of the product, the end of the workpiece on one side is subjected to distribution to values of the outer diameter equal to the outer diameter of the finished product, and use it as a supporting end.