SU1417954A1 - Method of hydraulic stamping - Google Patents

Abstract

The invention relates to the processing of metals by pressure and can be used in various fields of mechanical engineering in the manufacture of hollow parts by hydraulic stamping. The goal is to expand technological capabilities by increasing the degree of deformation of the workpiece material. The tubular billet (TZ) 1 is placed into a split matrix 2. It is stamped with TOR 1 by axial sediment with punches 3 under the action of hydrostatic pressure. The length of TK 1 is reduced by 30-50% without increasing the outer diameter of the tubular billet, and the wall thickness increases. TK I is then heat treated. Next, the TZ is distributed in a detachable matrix with 4 punches 3 Hz forces under the action of hydrostatic pressure P2. Get the finished product. I zpfla, 2 ill. (С (Л с: ШШ $ Fa,; o ate 4

Description

2

The invention relates to the processing of metals by pressure and can be used in various fields of engineering - in the preparation of hollow parts by hydraulic punching.

The purpose of the invention is the expansion of technological capabilities by increasing the degree of deformation of the workpiece material.

Fig. 1 shows a diagram of the axial settlement of the preform with the simultaneous action of hydrostatic pressure leading to a thickening of the walls of the preform; figure 2 - the same, when the distribution of the workpiece to the finished part.

The initial tubular billet 1 is placed in a detachable matrix 2 with a smooth cylindrical stream. The stamping of the billet 1 is carried out by axial draft of it by two punches 3 with FO forces (with simultaneous internal hydrostatic pressure P, while the length of the billet 1 is reduced by the value / 31 ( 0.3-0.5) 1, and the wall thickness t increases to a value t (Fig. 1). Then, the workpiece 1 is subjected to heat treatment to remove the work hardening of the workpiece material.

After heat treatment, the workpiece 1 is placed in a split matrix 4, in the central part of which there is a recess corresponding in shape and size to the finished part. The billet 1 is precipitated with punches 3 by forces f U1 by the magnitude of the PM, while the internal hydrostatic pressure P is acting simultaneously, changing the shape and external dimensions of the cross sections of the central part of the billet 1.

Example. Billet of steel 12X18H10T with an outer diameter of 25 mm and a wall thickness of tp 1, 5 mm, length

 mm upset force () KI with an internal hydrostatic pressure of 100 MPa. The amount of axial draft is 1 mm, it is 33 mm, the wall thickness is 8 mm. After the first stage of punching, the upset billet is subjected to heat treatment, in the following mode: heating to., Holding at this temperature for 8 minutes, cooling in water.

Then put the workpiece in the stamp again and settle with the force of axial draft Fa 3.97 kN, pressure P

- 150 MPa, and the axial draft is / 1/20 mm.

In the central part of the billet receive a cylindrical protrusion with an outer diameter of 45 mm, a length of 15 mm

and a wall thickness of 2.4 mm. Thus, the limiting degree of plastic dispensing of the workpiece is 1.8.

P-rmula of the invention

five

1, Method of hydraulic punching of hollow parts from a tubular billet by distributing by internal hydrostatic pressure with simultaneous

This is due to the fact that, in order to expand technological capabilities by increasing the degree of deformation of the material of the workpiece, prior to distribution, the walls of the workpiece are thickened without increasing the outer diameter of the tubular workpiece due to axial draft with decreasing length of the tubular material. billet 0 to 30-50%.

2, the method according to claim 1, characterized in that it is heat treated before dispensing the tubular billet.

Claims (2)

Claim 1. The method of hydraulic stamping of hollow parts from a tubular workpiece by distributing with internal hydrostatic pressure with simultaneous axial settlement of the workpiece, characterized in that, in order to expand technological capabilities by increasing the degree of deformation of the workpiece material, the workpiece walls are thickened before being expanded without increasing the outer diameter of the tubular billet due to axial upset with a decrease in the length of the tubular billet by · 30-50%. 2, The method according to claim 1, characterized in that before the distribution ’of the tubular billet, it is heat treated.