SU1761350A1 - Tool for warping pipe intermediate products - Google Patents

Abstract

Use: metal forming. SUMMARY OF THE INVENTION: The tool comprises a core punch in the form of a rod with a lead-in cylindrical part protruding above the die. Its length is 1.5 ... 2 diameters of the guide. The guide is aligned with the punch. The outer surface of the lead-in part of the guide is in contact with the inner surface of the punch during the deformation process. In order to obtain a tubular product with two shoulders on the guide after the lead-in part, a cylindrical ledge with a conical section is made. The diameter of the cylindrical ledge is equal to the outer diameter of the punch. 1 hp f-ly, 6 ill.

Description

The invention relates to the processing of metals by pressure and can be used in the manufacture of thin-walled buildings by stamping forging.

The aim of the invention is to improve the quality of the products and the reliability of the tool by fixing the punch along the deformation axis of the workpiece, as well as expanding the technological capabilities by obtaining products with two shoulders.

1 shows a tool in the initial position when receiving cylindrical articles with collar} in FIG. 2 — the tool at the time of the end of the process of pressing the products with the collar in FIG. 3 — the initial position of the tool when receiving tubular products with two shoulders; FIG. 4 — the tool before starting the process of pressing the workpiece when receiving the tubular product with two flanges in FIG. The tool at the time of the end of the process in Fig. 4Ј in Fig. 6 is the tool at the time of the termination of the distribution of the formed inner collar of the tubular product and the production of the second outer collar.

The tool contains a hollow punch 1, the pusher 2, receiving movement from a special hydraulic drive (not shown). The rolling matrix 3 receives a circular rolling movement from a drive (not shown). The guide 4 is made in the form of a rod with a lead-in cylindrical part 1.5–2 of its diameter protruding above the matrix and is installed coaxially with the punch with the possibility of contacting the outer surface of the lead-in part with the inner surface of the punch (i.e. the diameter of the lead-in part is equal to hollow punch holes for reliable 4J O

S sp

317

fixing and holding the punch on the machining axis during the deformation process).

In the case of obtaining a pipe product with one collar at the end, the guide 4 is fixedly mounted on the body 5 of the rolling mechanism. At the same time, the length of the guide cannot be less than the sum of the length of the lead-in cylindrical part (1.5 ... 2 of its diameter) and the length of the resulting product in order to prevent the stamped product from resting against the body 5.

In the case of obtaining products with two shoulders, guide 4 is made with a ledge having cylindrical 6 and conical 7 sections adjoining each other and located after the lead-in part of guide 4, and the diameter of the cylindrical section is equal to the outer diameter of the punch. In this case, the guide is provided with a drive for its axial movement in the form of a hydraulic cylinder 8.

The operation of the tool is as follows.

Upon receiving the product with one collar, the tubular billet 9 is placed on the punch 1 up to the stop in the pusher 2. The press and the punch 1 with the pusher 2 are turned on and the workpiece 9 starts to move towards the rolling mat, figure 3. The guide 4 enters the punch with holding the punch securely on the machining axis. Then, the workpiece 9 is deformed by the die 3. The punch 11 is removed from the punch by the push rod 2.

In the manufacture of a product with two shoulders, the billet 9 is placed on the hollow punch 1 up to the stop in the pusher 2 with departure relative to its end for a distance equal to the height of the step of the guide 4 and the height of the resulting shoulder.

When the press is turned on, the cylindrical portion of the guide 4 enters the hole in the punch 1. The projecting end of the workpiece 9 finds a shoulder 6 on the cylindrical section 6 (its minimum height is 4 ... 5 mm, such as ska during cold extrusion of metal). Then, the punch 1 rests on the step guide.

350

Until this point, the deformation of the workpiece by the rolling die 3 does not occur.

Upon further movement of the punch 1, it moves downwards downwards and the guide 4, overcoming the force that the hydraulic cylinder 8 develops. The rolling matrix 3 first compresses the end part of the workpiece 9, forming an inner collar on it. Further deformation of the workpiece is carried out by pressing or drawing with thinning.

5 Then the punch 1 with the guide 4 is moved upwards. After the product 11 exits the installation on its case, a special plate 10 is installed with a groove for the cylindrical section 6,

and the guide is moved down. The article 11 rests on the plate, and the conical section 7 of the punch distributes the inner collar of the product. At the same time on the product, in its lower

5 parts, an annular collar is formed. The dimensions of the collar are governed by the amount of overhang of the workpiece relative to the end part of the punch, as well as the size of the conical section 7.

0 The tool was tested when stamping the workpiece of a hydraulic lift case on a P7836 press with a force of 4000 kN. The frequency of the circular rolling movements of the matrix was 500 rev / min. The stamping of hot-rolled tubes of steel 35 was carried out by pressing as well as by drawing with thinning. Pipe dimensions: outer diameter 95, wall thickness 9 mm, length 400 and 500 mm.

e The parameters of the process of stamping by rolling: angle of inclination of the axis of the matrix O 2 °, feed, 5 mm / obk. Pipe products received a length of 590-620 mm. A guide was used, a punch with a diameter of 56 mm and a length of 120 mm. When pressing 12 blanks, the oscillation of the outer diameter was: 94.76 - 94.91 (when punching the same number of blanks without a guide punch, the external diameter fluctuations were 94.65- 94.62). When drawing with the thinning of 6 blanks, 90.20-90.45 (stamping without a guide 90.00-90.44 mm).

The use of the proposed tool improves the quality of the products by reducing the fluctuations in the outer diameter in height, and the reliability of the tool is improved by reducing 5

0

five

517

Neither the amplitude of oscillations of the punch D in the transverse direction, also extends the technological capabilities by obtaining, at the end parts of the articles of the outer annular shoulders, of increased thickness and length.

Claims (2)

1. A tool for deforming tubular blanks, comprising a punch that runs around a driven matrix, characterized in that, in order to improve the quality of the products and the reliability of the tool by fixing the punch on the billet deforming axis, it is provided with a guide punch, made in the form of a rod with a protruding above the matrix of the lead-in cylindrical part of a length equal to 06 1.5 ... 2.0 of its diameter, the punch is made hollow, the guide punch is installed coaxially with the punch with the possibility of contacting the outer surface of the lead-in part with the inner surface of the punch. 2. The tool according to claim 1, characterized in that, for the purpose of expansion of technological capabilities by obtaining products with two shoulders, the guide punch is mounted with the possibility of axial movement and is made with a ledge, v cylindrical and conical sections adjoining each other, and located after the feed-in part, the diameter of the cylindrical section being equal to the outer punch diameter. / W / vw / wrig./ F "g-2 about "V3 Gi-e FC1.5 IS