RU2247962C1 - Device for plastic upsetting of long-cut blanks - Google Patents

Abstract

FIELD: plastic metal working; aircraft manufacture; shipbuilding; mechanical engineering.

SUBSTANCE: device has two grips which are movable relative to base; sectors have rectangular projections received by guide slots of cover; provision is made for elastic member to ensure kinematic linkage of all movable members.

EFFECT: improved quality of blanks.

2 dwg

Description

The invention relates to the field of metal forming and can be used in aircraft, shipbuilding and mechanical engineering with the aim of developing high technologies to increase the bearing capacity of structural elements.

A device [1] is known for upsetting long workpieces. It contains a base, movable loading grips coaxially mounted in it and support clamps fixed relative to the base for fixing the workpieces to them at its ends, mating with each other along the conical surfaces and sectors kinematically connected along cylindrical surfaces with the base and the workpiece, respectively. A deforming force is applied to these grips and thereby blanking the workpiece without longitudinal bending due to the presence of the cage and sectors.

The disadvantages of this device include the deformation of the workpiece only by an amount equal to the length of the protruding from the sectors of the end part of the workpiece from the movable relative to the base of the load gripper, which leads to a limited degree of plastic deformation (not more than 0.1 relative deformation) of the workpiece for one installation in the device .

The invention is aimed at increasing the degree of plastic deformation of the workpiece for one installation in the device.

This is achieved by the fact that the support grip is made movable relative to the base, the sectors are made with projections of a rectangular shape and placed along a sliding fit in the guide grooves of the cover, the latter being mounted rigidly in the housing, and the elastic element is placed between the cage and the inner flange of the housing.

Figure 1 presents a structural diagram of the proposed device;

figure 2 is a view along section aa.

The device comprises a base 1 with two racks 2 mounted on it with coaxial cylindrical holes for placement of movable (along a sliding fit) in them relative to the base of the load 3 and supporting 4 grippers; as well as the housing 5, in the cylindrical hole of which a ferrule 6 and supporting sectors 7 are made, made in the form of a truncated cone with a coaxial hole, along which the sectors mate with the workpiece installed between the grippers 3 and 4. The ferrule 6 is made with coaxial cylindrical and conical surfaces. It serves to implement a kinematic connection between sectors 7 and housing 5, mating with the latter along a cylindrical surface, and with sectors along a conical one. To ensure the possibility of moving the sectors 7 in the radial direction relative to the workpiece 8, the sectors are made with projections of a rectangular shape (see figure 2) and placed on a sliding fit in the guide grooves of the cover 9, mounted rigidly in the housing 5.

In order to ensure an appropriate kinematic connection between all the moving elements of the device, a supporting elastic element 10 (for example, in the form of an elastic ring) is placed in the housing 5 between the holder 6 and the inner flange of the housing.

The device operates as follows.

The workpiece 8 is installed between the grippers and sectors 7, which are fixed by a clip 6 under the influence of the elastic element 10. The axial force P is applied to the ends of the workpiece through the grippers 3 and 4. In this case, sectors 7 will move in the radial direction relative to the last due to the increase in the transverse size of the workpiece along the guide grooves in the cover 9, and the holder 6 will be displaced in the axial direction (to the right), overcoming the resistance of the elastic element 10. Thus, the workpiece will be deposited by an amount equal to the total length from the sectors of the end parts of the preform, and in this regard, the deformation of the preform doubles in comparison with the deformation implemented in the device [1].

The taper angle of the mating conical surfaces of the cage and sectors is determined from the condition of ensuring uniform deformation of the workpiece along its entire length.

To reduce the friction forces between the contacting surfaces of all moving elements of the device, an antifriction layer is placed.

Thus, the proposed device is more productive in comparison with the prototype. It is quite simple and reliable in operation. The use of the device in industry as a die tooling will allow to implement high technologies in metal forming to increase the reliability of machines and mechanisms.

Sources of information

1. A.S. USSR No. 1810786, G 01 N 03/08, 04/23/1993, Bull. No. 15.

Claims (1)

A device for plastic upsetting of long workpieces, comprising a base, support and load grips coaxially mounted therein for securing the workpiece at its ends, a clip and sectors conjugated along conical surfaces and kinematically connected respectively to the base and the workpiece, characterized in that the support grip made movable relative to the base, the sectors are made with projections of a rectangular shape and placed on a sliding fit in the guide grooves of the cover, while the latter installed He is rigidly in the housing, and the elastic element is placed between the cage and the inner flange of the housing.

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