RU2265495C1 - Method for forming rod parts with thickened portion - Google Patents

Abstract

FIELD: plastic metal working, possibly manufacture of rod parts with heads.

SUBSTANCE: method comprises steps of placing portion of heated measure blank in movable die spring-loaded in axial direction and forming thickened portion. Die is mounted with possibility of motion in direction coinciding with that of punch motion. Additional step is realized for forming rod due to placing portion of blank in one-piece die with technological gap. Before forming thickened portion and rod, free heading of the whole blank is performed. Then die is moved and simultaneously first stage of heading thickened portion and step of rod forming by closed heading are realized. Closed heading is performed due to moving portion of blank in direction inverse relative to motion direction of punch and die. Then thickened portion is headed in fixed position of die.

EFFECT: possibility for making rod parts with thickened portion by means of simple technological tooling in high-speed automatic presses.

3 cl, 6 dwg, 2 ex

Description

The invention relates to the processing of metals by pressure and can be used in the manufacture of rod parts with heads.

A known method of manufacturing core parts with a thickening, comprising placing part of a heated measuring billet in a movable axially spring-loaded matrix, having the ability to move in the direction coinciding with the direction of movement of the punch, forming a thickening (see AS USSR No. 1690935, class B 21 J 5/08).

However, the known method of manufacturing core parts with thickening, carried out at different speeds of movement of the die and punch, significantly complicates the design of technological equipment with independent drives and a press unit, it does not allow stamping on high-speed press machines.

Closest to the technical nature of the present invention is a method of manufacturing core parts with a thickening, comprising placing part of the heated workpiece in a movable axially spring-loaded matrix that can move in the direction coinciding with the direction of movement of the punch, forming a thickening (see Okhrimenko Y.M Technology of forging and stamping production. M.: Mechanical Engineering. 1976, p. 418, Fig. 270).

However, the known method of manufacturing core parts with a thickening is implemented using complex technological equipment and a complex press unit, it does not allow stamping on high-speed press machines.

The objective of the present invention is to develop a new method for the manufacture of rod parts with a thickening, allowing you to implement it using simple technological equipment on high-speed press machines.

To solve this problem, a method of manufacturing core parts with a thickening comprises placing a part of the heated measuring billet in a movable axially spring-loaded matrix that can move in the direction coinciding with the direction of movement of the punch, forming a thickening.

In contrast to the prototype, the core is additionally formed, for which the part of the workpiece is placed in a solid matrix with a technological gap. When forming a bulge and a rod, a free draft of the entire preform is carried out first, then simultaneously with the movement of the matrix, the initial stage of disembarkation of the thickening and the formation of a rod with a closed draft are performed, by moving part of the workpiece in the opposite direction to the movement of the punch and die, after which the final stage of disembarkation is performed thickening.

An additional distinguishing feature when conducting the stamping process according to the proposed method is the use of measured billets heated from one end, part of which, together with the other end, is placed in a movable axially spring-loaded matrix.

Another additional distinguishing feature is the concurrently with the displacement of the matrix of the initial stage of the planting of the thickening and the formation of the stepwise with the transitional section of the rod closed portion of the preheated heated from one end of the workpiece under the influence of the other end of the workpiece.

The above general, sufficient in all cases, essential features of the described invention provide a technical result consisting in the implementation of a new method using simple technological equipment in high-speed press machines.

A causal relationship between the essential features of the claimed invention and the achieved technical result is as follows.

Placing a part of the workpiece in an integral matrix with a technological gap provides high reliability of a high-speed transmission mechanism at the time of repulsion of the workpiece from its grips into the matrix. Placing blanks in a matrix with minimal gaps is possible only with manual labor or with the control of the repulsion operation.

First, free settlement of the entire workpiece, then the initial stage of disembarkation of the thickening and the formation of the rod with a closed draft simultaneously with the movement of the matrix, determines the complete filling of the matrix channel with the metal of the workpiece and obtaining the exact dimensions of the part without necessarily advancing the movements of the matrix and punch. This makes it possible to use a simple design of technological equipment used in high-speed press machines. The movement of the matrix is automatically adjusted according to the ratio of the forces of deformation of the thickening from the side of the punch and the forces of deformation of the rod from the side of the ejector.

The set of essential distinguishing features makes it possible to use the proposed method for the manufacture of rod parts with a thickening of measuring billets heated from one end, with the same technical result being achieved - the possibility of manufacturing parts on high-speed press machines.

Particularly effective is the application of the proposed method for the manufacture of parts with a step with a transitional section of the rod. The presence of different ductility of the metal at the ends of the workpiece is compensated by the transition section without compromising the accuracy of the part.

To explain the invention, the following are examples of the method with reference to the accompanying drawings, in which:

figure 1 presents the layout of the workpiece in the matrix;

figure 2 - diagram of the initial stage of landing;

figure 3 - diagram of the final stage of disembarkation;

figure 4 - layout in the matrix of heated from one end of the workpiece;

figure 5 - diagram of the initial stage of landing;

6 is a diagram of the final stage of disembarkation.

Example 1 of the method of manufacturing parts.

Heated to 980 ° C steel billet 1 with a diameter of 21.65 mm is placed in a solid matrix 2 until it stops in the ejector 3 (figure 1). The diameter of the matrix channel is 22 mm. When the pressure of the punch 4, first carry out a free draft of the entire workpiece. Then, as soon as the friction forces of the contacted surface 5 of the channel of the matrix 2 of the workpiece against this surface exceed the compressive force of the spring 6, the initial stage of disembarkation of the thickening and the formation of the rod, primarily adjacent to the thickening, closed by sediment, are carried out in the direction opposite to the movement of the punch and the matrix (figure 2). The formation of part 7 of the rod with a diameter of 22 mm adjacent to the resulting thickening begins due to the metal coming partially from the volume of the resulting thickening, and partially from the volume of the metal of the workpiece located in the channel of the matrix, when moving the matrix.

When the supporting surface of the thickening is formed, the further formation of the rod occurs due to the metal located in the channel of the matrix. As the punch and the matrix move, the supporting surface of the thickening increases due to an increase in the deformation resistance of the remaining metal in the matrix. The final stage of disembarkation of the thickening is carried out after contact of the rear end 8 of the matrix with a fixed stop (figure 3).

With the reverse stroke of the punch, the matrix by means of springs is returned to its original position, and the finished part 10 is pushed out of the matrix by the ejector. The cycle repeats.

Example 2 of the method for manufacturing a part with a stepped rod.

Heated from one end to 1000 ° C steel billet 1 with a diameter of 21.8 mm is placed in a solid matrix 2 until it stops in the ejector 3 (Fig.4).

The diameter of the matrix channel portion for the formation of a smaller diameter rod portion is 22 mm, and the matrix portion for the formation of a larger diameter rod portion is 24 mm. In addition to part 4 of the billet heated to 1000 ° C, it contains part 5 with a reduced temperature (transition zone) and a cold end 6.

When the pressure of the punch, first carry out a free draft of the heated part 4 of the workpiece. Then, as soon as the friction forces of the contacted surface 7 of the channel of the matrix 2 of the workpiece against this surface exceed the compressive force of the spring 8, the initial stage of disembarkation of the thickening and the formation of a rod with a larger diameter of 24 mm are carried out, primarily adjacent to the thickening closed by upsetting in the opposite direction the movement of the punch and the matrix (figure 5).

The formation of part 9 of the rod with a diameter of 24 mm adjacent to the resulting thickening begins due to the metal coming partly from the volume of the resulting thickening and partly from the volume of the metal of the workpiece located in the channel of the matrix when moving the matrix.

When the supporting surface of the thickening is formed, the further formation of the rod with a diameter of 24 mm occurs due to the metal of part 4 of the workpiece heated to 1000 ° C and transition zone 5. As the punch and die move, a transition conical section is formed due to the metal of transition zone 5 and part of the metal boundary cold end 6 under its influence. At the last moment of the matrix movement, calibrate the cold end of the rod.

The final stage of disembarkation of the thickening is carried out after contact of the rear end 10 of the matrix with a fixed stop 11 (Fig.6).

With the reverse stroke of the punch, the matrix by means of springs returns to its original position, and the finished part 12 is removed from the matrix by the ejector 3. The cycle is repeated.

The proposed method of manufacturing parts can be implemented in the organization of the production of travel screws on the hot stamping line L 316, including a high-speed press machine with the number of strokes per minute - 100.

Claims (3)

1. A method of manufacturing core parts with a thickening, comprising placing part of a heated measuring billet in a movable axially spring-loaded matrix, having the ability to move in a direction coinciding with the direction of movement of the punch, forming a thickening, characterized in that it further conducts the formation of the rod, for which the placement parts of the workpiece in the whole matrix are carried out with a technological gap, and when forming the thickening and the rod, free settlement of the entire workpiece is first carried out, then, simultaneously with the movement of the matrix, the initial stage of disembarkation of the thickening is carried out and the rod is formed by a closed draft, which is carried out by moving part of the workpiece in the direction opposite to the movement of the punch and matrix, after which, when the matrix is stationary, the stage of disembarkation of the thickening is performed. 2. The method according to claim 1, characterized in that in the movable axially spring-loaded matrix, a part of the measured workpiece heated from one end is placed. 3. The method according to claim 2, characterized in that, simultaneously with the movement of the matrix, the initial stage of disembarkation of the thickening is carried out and the step with the transitional section of the rod is formed by the closed precipitate portion of the measured workpiece heated from one end under the influence of the other end of the workpiece.

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