SU1516275A1 - Method of projection resistance welding of composite metal tap - Google Patents

Abstract

The invention relates to a contact relief welding method of a bimetallic tap and can be applied in tool manufacturing. The goal is to improve the quality of the welded joint by increasing the integral strength. A hole is made in the working part of the billet body of a tap from structural steel, the axis of symmetry of which coincides with the axis of symmetry of the body billets. The size of the hole is determined depending on the size of the body and the pen blank. At the same time, the welding temperature at the peripheral contact areas of the working part of the body blank and the feather billet increases and, therefore, the integral strength of the welded joint increases. 1 il.

Description

The invention relates to a contact relief welding method of a bimetallic tap and can be applied in tool manufacturing.

The aim of the invention is to improve the quality of the welded joint by increasing the integral strength.

FIG. Figure 1 shows the blank cross-section and the distribution of the welding temperature and strength of the welded joint across the tap of the tap; in fig. 2 - the same. the cross section along the feather billet and the strength of the welded joint along the pen of the tap.

The method is carried out as follows.

In the working part of the workpiece korpusg 1 tap of structural steel

a hole is made, the axis of symmetry of which coincides with the axis of symmetry of the workpiece. At the same time, the hole diameter D is 0.4-0.6 times the diameter of the core of the body blank D. And the hole depth H exceeds the length L of the blank billet pen 2 of high speed steel by an amount not less than the width of the pen B. Block billet 1 and The feathers 2 are prepared, and prepared they are installed in a clamping welding machine. The clamped blanks of housing 1 and feathers 2 are welded by known technology. The welded billet of the tap is thermally and mechanically processed by known technology.

The physical essence of the method is as follows.

Making a hole in the working part of the workpiece of the tap body 1 drastically changes the conditions of the heat sink during contact relief welding of a bimetallic tap. As a result, the welding temperature at the peripheral contact areas of the working part of the body workpiece and the tap feathers increases, and hence the integral strength of the welded joint increases.

If DQ is 0.4 Dg, then the welding temperature at the peripheral contact areas is low, which means that the integral strength is also low.

If D is 0.6 D, then the welded bimetallic tap during operation is destroyed over the cross section.

If H L + B, then the welding temperature at the peripheral contact areas is low, which means that the integral strength is also low.

An example. Contact relief welding of a bimetallic tap M 3Ux1.3 with geometrical dimensions according to GOST is performed as follows.

In the working part of the workpiece, the taper body 1 of the constructional brand 40X was driven by a hole, the axis of symmetry of which coincides with the axis of symmetry of the workpiece. At the same time, Do 0.6 Dg 9 mm and H L + B 45 mm. The blanks of the housing 1 and feathers 2 taps of high-speed steel brand RbM5 prepare. The prepared billet body 1 and feathers 2 are installed in the clamps of the welding machine. The blanks of the housing 1 and feathers 2 are welded according to a known technology.

15162754

A batch of taps are tested on flocks of ЖА 250-118 when cutting a through thread with a length of 29 mm in details of steel grade St. 35. Regrinding of taps is forced after threading every 200 parts. The taps are removed from the tests for two main reasons: due to the diameter of the thread going beyond the lower limit of the tolerance floor, and also due to the breakage of the feathers along the weld.

Taps, welded to the proposed-1MU method, are characterized by

15

20

25

thirty

35

25% resistance compared to taps welded by a known method.

The application of the invention improves the quality of the welded joint.

Claims (1)

Invention Formula The method of contact relief welding of a bimetallic tap, in which high-speed steel billet feathers are welded to the body casing made of structural steel, characterized in that, in order to improve the quality of the welded joint by increasing the integral strength, the hole, the Symmetry axis are drilled in the working part of the body billet which coincides with the axis of symmetry of the body blank, and the hole diameter is 0.4-0.6 times the core diameter of the body blank, and the depth of the hole exceeds the length of the blank and a pen by an amount not less than the width of the feather blank. 25% resistance compared to taps welded by a known method. The application of the invention improves the quality of the welded joint. Invention Formula The method of contact relief welding of a bimetallic tap, in which high-speed steel billet feathers are welded to the body casing made of structural steel, characterized in that, in order to improve the quality of the welded joint by increasing the integral strength, the hole, the Symmetry axis are drilled in the working part of the body billet which coincides with the axis of symmetry of the body blank, and the hole diameter is 0.4-0.6 times the core diameter of the body blank, and the depth of the hole exceeds the length of the blank and a pen by an amount not less than the width of the feather blank. // Y // /////// A j IG, five t 1 kg at "6, G" 2 Phage.g