SU1292897A1 - Cold header - Google Patents

Abstract

The invention relates to the field of metal forming and improves the productivity of a cold-set automatic machine due to the rapid charging of a stepped ram of a hydrostatic drive. The hydropercussion actuator 24 is made in the form of concentrically mounted cylinders (C) of the outer 25 and inner 26 containing the upper 34 and lower 39 a series of openings (O). Stepped f / O IS J2 10 a 1 38 3Sa € (L y; o th CX) with r8 are installed in the internal C

Description

plunger (П) 32, which creates a high-pressure working impulse, and a hollow two-stage spool with three rows of holes (o) 34, 35 and 36. When O 34 34 combines internal C 26 and spool 33, the compressed gas accelerates the stepped P 32, Working pistons 5 hydraulic cylinders 3 carry out technological operations. The spool 33 is switched by electro1

The invention relates to the processing of metals by pressure, namely to cold heading machines for the manufacture of core blanks.

The purpose of the invention is to increase productivity.

FIG. 1 shows a diagram of a holbdov novado 1 automaton in FIG. 2 - arrangement of the spool mechanism at various moments of the cycle.

The machine contains rotary table 1 mounted on a frame with dies 2, working hydraulic cylinders 3 with punches 4, including pistons 5 and spools 6, feed mechanism consisting of hydraulic cylinder 7, piston 8 with rod, carriage 9, on which axis 10 are supplied pawl 11, working spring 12. The turntable 1 is connected by means of a shaft 13 to a flange 14 on which fingers 15 are fixed, and has an actuator consisting of a hydraulic cylinder 16, a piston with a rod 17, an axis 18 with a folding pawl 19, a return spring 20. The ejection mechanism of the machine consists of and pusher 21, the rocker rod 22 and the pusher 23.

The impactor drive 24 is made in the form of two concentrically mounted cylinders of the outer 25 and inner 26, barrel 27, containing three rows of holes 28-30 and high pressure chamber 31 of the stepped cylinder 32, hollow two-stage spool 33 with three rows of holes 34 -36, The upper row of holes 36 of the spool connects through the grooves 37 the cavity of the inner cylinder with the atmosphere in the upper medium to the upper position, connecting the cavity of the inner C 26 to the atmosphere with O 36 and the segment groove 37. Step 32 The second gas passing from the outer C 25 through the lower row of O 39 to the inner C, cocks the P into the upper position. The actuators of the machine begin processing functional cycles, 2 Il.

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The slide valve for relieving pressure during charging of the stepped plunger 32. The middle row of holes 35 connects the cavity of the inner cylinder, depending on the position of the slide, with the rod stem of the slide and the ring undercut in the sleeve of the hydrostatic drive flange and is designed to balance the gas pressure in the rod and rodless spool spool to prevent the spool from moving when the compressed gas is started up from the outer 25 to the inner 26 cylinders. The spool 33 is set in motion by an electromagnet 38.

The inner cylinder 26 contains upper 34 and lower 39 rows of holes connecting the cavities of the outer and inner cylinders, respectively, in the area of the spool 33 and in the area between the steps of the plunger 32 of the hydrostatic drive.

The machine also contains hydroaccumors 40 and 41, pipelines 42-44, valve 45 and pipeline 46.

The machine works as follows.

Before starting the operation, the valve 33 is in the upper position, the disconnected cavity of the outer 25 and inner 26 cylinders. The outer cylinder 25 of the hydropercussion actuator 24 is filled with compressed gas through the valve 44, and the high-pressure chamber 31 is filled with liquid through the feed channel 29,

When the valve 33 is switched by means of an electromagnet 38, the holes 34 are aligned in the lower position

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on the spool and inner cylinder 26. Squeeze the gas from the outer cylinder into the cavity of the inner cylinder and accelerate the stepped plunger 32 to the required speed. From the cavity of the inner cylinder through the hole 39, the gas is pumped into the outer cylinder due to the difference in the areas of the stepped plunger 32.

When a plunger 32 strikes a fluid in a high-pressure chamber, a high-pressure pulse occurs, under the action of which the pistons 5 of the working hydraulic cylinders 3 move to the extreme left position, deforming the billet with punches 4. At the same time, the pistons 5 move the spools 6 of the working hydraulic cylinders to the left, opening windows 47 Excess fluid from the high-pressure chamber is pumped to the hydroaccumulator 40. Hydroaccumulator 41 serves to feed the high-pressure chamber with the liquid and to receive liquid during the working stroke.

When the spool 33 is switched to the upper position, the cavity of the inner cylinder is connected to the atmosphere by means of the openings 36 and segment slots 37, and the opening 34 is blocked by the spool. The openings 35 enter the annular undercut of the sleeve of the hydrostatic drive flange and provide equal pressure in the rod and rodless cavity of the spool.

The stepped plunger 32 under the action of compressed gas passing from the outer cylinder 25 through the lower row of holes 39 into the inner cylinder, brings the stepped plunger to the extreme upper position, allowing the actuators to start working out the functional cycle. During the course of the plunger 32 upward fluid from the stem cavity of the barrel 27 through the holes 30, the pipelines 43 and 46 enters the rod end of the working hydraulic cylinders 3, the pistons 5 retract to their original position, turning the table 1 into the rod cavity of the hydraulic cylinder 7 into the rodless cavity of the hydraulic cylinder 16 feeder, tap feed dogs 11 to the position of capture.

The blanks are cut off by dies 2 when the table is rotated by the action of the pawl 19 on the fingers 15 when the rod is moved

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17. The removal of the finished product from the last position is carried out by the rod 23 through the rocker 22 and the pusher 21, at the working stroke. 5 The use of the proposed cocking mechanism of a cold-toping machine allows to increase the productivity and reliability of work.

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Claims (1)

Invention Formula A cold-heading automaton containing a rotary table with landing matrices placed on it, co-axes of punches installed on the frame with their actuators in the form of power cylinders connected by pipelines with a high-pressure chamber, their hydrostatic drive and two hydraulic accumulators, a stepped plunger mounted a step of larger diameter in the high pressure chamber, and another step associated with the drive of its reciprocating movement, characterized in that, in order to increase the performance from the side of its drive is complete with an additional step, and the drive of its movement is made in the form of two cylinders mounted concentrically one to another, forming two cavities filled with gas, of the valve in the form a hollow two-stage body with three rows of openings, one of which is made at a higher stage to connect the cavity of the inner cylinder with the external cavity, and the other two, successively placed in a smaller diameter stage, respectively, for connecting the cavity of the inner cylinder with the cavity of the valve and for connecting the cavity of the inner cylinder with the atmosphere associated with the spool, while the additional stage of the plunger of the hydrostatic actuator is located in the cavity of the inner cylinder, opposite to it in The same valve is installed, and on the side of the inner cylinder there are two rows of holes, respectively, for connecting the cavities of the outer and inner cylinders in the zone between the outermost steps of the hydraulic percussion plunger and in the zone where the spool is located. 32 2