RU1819183C - Die for die stamping of large-sized crankshafts - Google Patents

Abstract

Usage: metal forming, die design for the manufacture of large crankshafts. SUMMARY OF THE INVENTION: the stamp comprises an upper plate with wedge-shaped elements on which gaskets are rigidly fixed. Punch holder. freely mounted in rails. The punch is made in the form of two detachable sections. Guides are fixed to the bottom plate. Matrix sections with covers are housed in creeps that move along the guides. On the bottom plate and on each section of the punch stops are made. The working surfaces of gaskets, guides, covers and creepers are made inclined. 3 ill.

Description

The invention relates to the processing of metals by pressure, and in particular, to die designs for stamping large crankshafts.

The aim of the invention is to increase the reliability of the structure by self-centering the moving parts of the die.

In FIG. 1 schematically shows a stamp for stamping; in FIG. 2 is a top view of the lower part of the stamp: in FIG. 3 is a section AA in FIG. 1.

The stamp according to the invention comprises a bottom plate 1 with guides 2 mounted on it, sliders 3 and 4, in which sections of the matrices 5 and 6 are placed, sleeve 7 and section retainer 8, covers 9 and 10, in which sections are placed

matrices 11 and 12, sleeve 13 and retainer section 14, wedge elements 15 and pins 16 and 17 attached to the wedge elements, a punch holder included in the wedge elements 15 with punch sections 18.

The working surfaces of the guides 2, the gaskets 16 and 17 of the wedge elements 15 and the corresponding surfaces on the spiders 3 and 4 and the covers 9 and 10 are made inclined, in the direction to the axis of symmetry of the stamp, with an apex angle of 7-45 °.

The proposed stamp for stamping large crankshafts operates as follows.

The upper part of the stamp with wedge elements 15 and attached to the wedge

00

h

00

with

with

the elements with gaskets 16 and 17, covers 9 and 10 and the matrix sections 11 and 12 installed therein, the sleeve 13 and the clamp section 14, as well as the punch holder with the punch sections 18 are raised up.

The workpiece 19c with a heated section, the volume of which is equal to the volume of two cheeks and one neck of the crankshaft, is placed on the sections of the matrices 5 and b, the sleeve 7. and the section of the latch 8, located in the poles 3 and 4, which are in the initial position - apart.

When the press traverse moves downward, after the covers 9 and 10 are pre-connected with the sliders 3 and 4, as well as the sleeve 13 with the sleeve 7, the retainer sections 14 and the retainer section 8, the wedge elements 15 come into operation, pressing the upper parts of the stamp to the corresponding lower parts , in the image of two landing blocks - left and right. Wedge elements 15 transform the vertical movement of the press beam into the horizontal oncoming movement of the landing blocks. At the same time, the sections of the punch through a swivel joint cover a portion of the workpiece, the volume of which is equal to the volume of the crank neck of the crankshaft. The process of bending and landing of the crankshaft crank occurs.

In the process of moving the gaskets 16 and 17 of the wedge elements 15 along the corresponding surfaces of the covers 9 and 10 and the crawlers 3 and 4, the horizontal components of the reaction forces that arise tend to establish the upsetting blocks, blocks strictly along the central (longitudinal) axis of the stamp without distortions, In addition, the horizontal components of the reaction forces arising from the movement of the creepers 3 and 4 along the inclined surfaces of the guides 2 also seek to establish the landing blocks along the longitudinal axis of the punch,

When the press traverse moves upward, the crankshaft 19 is removed from the stamp, the sprockets 3 and 4 are retracted to their original position by pneumatic cylinders (not shown in the drawing). The horizontal components of the reaction forces arising in the inclined surfaces 2 set the sprockets 3 and 4 strictly along the axis of the punch to the initial position before punching. The movement of the pads in the longitudinal direction is limited by stops (not shown in the drawing).

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The angle of inclination a in the guides 2 and gaskets 16 and 17 of the wedge elements is set within 7-45 °. The minimum angle of inclination must be greater than the angle

10

fifteen

twenty

25

thirty

35

40

45

fifty

55

self-braking (sliding friction angle). In the case of steel sliding on cast iron under the conditions of applying liquid lubricant, the friction angle is approximately equal to 7. In this case, the creepers under their own weight will be installed strictly along the axis of the stamp,

As preliminary studies of the design options of the stamp have shown, with an inclination angle in the guides of more than 45 °, the dimensions of the stamp are significantly increased.

In addition, when the angle of inclination a on the contacting surfaces of the wedge element and the crawls with covers is more than 45 °, the force moving the crawlers with covers along the axis of the die is significantly reduced (dependence on cos a.). At the same time, the forces shifting the crawlers with covers across the axis of the die increase (dependence on sin)).

For the normal operation of the die, the optimum ratios of these forces are at angles of inclination of up to 45 °,

The proposed stamp for stamping large crankshafts in comparison with the prototype increases the reliability of the stamp, and therefore, increases its service life by 15-20%.

Claims (1)

Claims A stamp for stamping large crankshafts, comprising a top plate with wedge elements and a gasket rigidly fixed to them; mi, a punch holder freely mounted in rails rigidly connected to the wedge elements, and connected to them by means of pins, a punch made in the form of two sections detachable in a vertical plane, hingedly connected to a pull and a punch holder movably mounted in the punch holder, with each section of the punch and punch holder is made with contact inclined surfaces, the bottom plate with guides fixed on it, the crawlers with the sections of the matrices with covers placed in them, installed nnye to cooperate with these guide rails, wherein on the lower plate and each section of the punch are made abutments for preventing unlocking of said sections of m- lichayuschiys in that, in order to increase the reliability of the structure due to self-centering movable die parts, working surfaces polzushek. covers, guides, and gaskets are made inclined elk symmetry stamp with an angle at apex 7 .., 45 °. && (puz.Z L-d -AND Fig.Z