SU1731648A1 - Screw press of double action - Google Patents

Abstract

The invention relates to the field of forging and stamping production and, in particular, to the production of screw presses. The purpose of the invention is the expansion of technological capabilities. In the guide frame 1, an outer slide 2 and an inner slide 3 placed in the latter are mounted. A hollow screw 5 with a housing nuts 6 is connected with nuts 12 and 4 of the outer 2 and inner 3 of the sliders, respectively. On the crossbar 16, placed in the guides 17, additional elastic stoppers 21 are installed. On the outer slider 2, there are mounted tubes 22 with stops 23, and on the lower surface of the upper cross member of the bed 1 there are elastic stops 25. During the deformation of the workpiece from sl

Description

The invention relates to forging production, in particular to the production of screw presses, and is an improvement of the invention according to the author. No. 1613357.

A double screw screw press is known, which contains a frame, a screw with a flywheel mounted in the frame, an outer slide located in the frame guides, made with two internal cavities, Q of which is a nut that interacts with a screw, and in the other - an inner slide with a nut as well as flywheel drive. In the cavity of the outer slider there is a hollow screw rigidly connected to the housing of the nut of the outer slider and screw-cutting with the nut of the inner slider. In addition, the press is provided with a movable cross member with an internal screw thread, screwed with another screw cut made on the outer surface of the nut body and guiding the movable cross member, the screw cutting direction of the movable cross member opposite to the cutting direction of the outer slider nut, and elastic limiters installed on the press stand. movement of the movable cross member.

Also known is a double-action screw press containing an outer slider mounted in the bed guides and an inner slider housed in its cavity and a housing connected to the outer slider with a nut coupled to a screw mounted rotatably and rigidly connected to the drive flywheel. A hollow screw articulated with a nut with a nut of an internal slide is inserted into the nut body; a nut articulated with a nut body is mounted on the outer slide; a cross member with a nut articulated with a body g Menus and the additional cross member, associated with the threaded bushing, mounted on the outer slider, and resilient restraints that obtained on between the cross member and

an additional crossbar the emphasis established on a bed.

A disadvantage of the known construction of the press is the limited technological capabilities of the press, which do not allow to obtain forgings with deep cavities, since the design of the press does not ensure the forced pulling out of the punch associated with the inner slide, from the forging.

the rise of the inner slide is due to the weight forces of the outer and inner slide. In addition, the necessity of forcibly raising the inner slide relative to the outer one may arise

in the event of a leakage of the workpiece material between the punch and the die and the formation of a burr. These deficiencies of the known design become significant when the press operates as part of an automated complex, since it can lead to an emergency operation of the press with an automated supply of blanks and removal of forgings.

The purpose of the invention is to create

press having high technological capabilities, providing forgings of a wide range.

This goal is achieved by the fact that the double screw screw press is equipped with

additional resilient stoppers and pull-outs with stops, additional stoppers are installed on the cross-bar, the ends are connected by one ends with the outer slider, and on the other ends of the pull-rods stops are installed with the possibility of their interaction with additional resilient stoppers installed on the bottom surface of the upper cross member of the frame.

Figure 1 shows the press, a general view; figure 2 - the same option.

The press contains a frame 1, in the guides of which an external slider is mounted.

2, in the inner cavity of which there is an inner slide 3 with a nut 4 fixed in it, interacting with a hollow screw 5 which is rigidly connected with

the housing 6 of the nut 7 interacting with the screw 8, on the upper end of which the flywheel 9 is installed, the screw 8 is installed in the frame 1 rotatably in the hub 10 and the bearing 11. The hollow screw 5 and the housing 6 are installed in the outer slide 2 in the cavity of the outer slider in the nut 12, rigidly fixed in the housing 13, which is attached to the outer slider 2 through the spacer 14.

Another screw cut on the housing 6 interacts with a nut 15 fixed on the crossbar 16. The latter can move in the guides 17 located on the base 1 or in the guides of the outer slider (not shown). An additional cross bar 18 is also installed in the guides 17 and is threaded to the sleeve 19 mounted on the body 13 of the outer slider 2. The additional cross bar 18, like the cross bar 16, can be moved in the outer slider guides (not shown).

Stops 20 are mounted on the press frame 1. Additional elastic stoppers 21 are mounted on the crossbar 16. The rigs 22 are connected by one end to a housing 13 fixed to the outer slider 2, and on the other ends of the rigs 22 are stops 23 located above the additional elastic stops 21, between the crossbar 16 and the additional crossbar 18, elastic stoppers 24 are installed. On the lower surface of the upper crossbar of the frame 1, elastic stops 25 are installed.

On the inner slider 3, the outer slider 2 and the lower crossbar of the bed 1 is fixed working tool 26-28.

The press works as follows.

Before the operation of the press, the outer slider 2 and the elements of the press construction associated with it are raised to the extreme upright position. The inner slider 3 occupies the uppermost position relative to the outer slider 2. The sleeve 19 abuts against the housing 13.

When the press drive (not shown) is turned on, the flywheel 9 and the screw 8 connected with it begin to rotate rapidly, and the screw 8 fastens the nut 7 by moving down the body 6, the hollow screw 5, the outer 2 and the inner 3 sliders. The nut 7 and the housing 6 do not rotate downward during acceleration, therefore the cross member 16, as well as the additional cross member 18, are moved downwardly together with the outer slider 2.

The joint movement of the outer slider 2, the inner slider 3, the cross member 16 and the additional cross member 18 is carried out until the additional cross member 19 contacts the stops 20, after which the additional cross member 18 stops and the outer slider 2, the cross member 16 and the inner slider 3, is hollow screw 5, body 6, and other structural elements associated with the outer 2 and inner 3 sliders. continue to move downward. Crossbar 16, moving down, rests on elastic stoppers 24 and deforms them. When this occurs, the vertical force PI from the elastic stops 24 interferes with the downward movement of the cross member 16 and the nut 15 rigidly connected with it. In the screw connection of the nut 15 to the housing 6 a torque ML accelerating the housing 6 occurs in the direction of rotation of the screw 8. Under the action of this vertical force produces a torque M2. in the screw connection there is a nut 7-screw 8, acceleration of the running body 6 also in the direction of rotation of the screw 8. The total moment accelerating the body 6:

M M1 + (| 1-f. (1)

where hi and ha are the thread stroke of the nut 7-screw 8 and the nut 15-body 6.

The speed of movement of the outer slider 2 is reduced and is determined by the expression

.

(2)

 H l 2 l: where W1 is the angular velocity of rotation of the screw 8;

C02 is the angular velocity of rotation of the nut 7 (body 6);

Outlet thread nut 12-body 6.

When the outer slide 2 is moved downwards, the elastic stops 24 are compressed, which causes the outer slide 2 to be braked and the body 6 is accelerated, which initially causes the crossbar 16 to decelerate, and then move it up and unload the elastic stops 24.

The braking stroke of the outer slide 2 and the work of deforming the elastic stops 24 is selected such that the closing speed of the working tool 27 and 28 is zero. From this condition, expression (2) is obtained

hl - (3)

(Oi

o) 1

hi + pz

With further rotation of the screw 8 and the housing 6 with the hollow screw 5 according to the expression (3), the inner slider 3 continues to move downward with speed

G12 + HZ ,,

HC p OU2 (4)

and cross member 16 moves up:

h2 - bc vn l: ° b When the cross-bar 16 moves upwards, the compression with the force PZ of the elastic stops 21 between the cross-bar 16 and the stops 23 takes place.

The design of the press provides the ratio between the force PH of the outer slide, clamping the tools 27 and 28, and the force PB of the internal slide, which ensures the deformation of the workpiece: Ph Hz - hi Pb

(6)

hi + bz

When the drive is reversed, a torque acts on the flywheel 9, which causes the flywheel 9 and the screw 8 to rotate. Simultaneously from the force P2 of the elastic stops 21, a torque Mz in the threads of the nut 15-body 6 and the nut 12-body 6: h2 - ha

MZ RZ

2 well

(7)

РЗ Р2

(eight)

Under the action of the moment from the drive and the moment Мz, the body 6 rotates in the direction of rotation of the screw 8, and the hollow screw 5 rigidly connected to the body 6 lifts the nut 4 and the internal slider 3 rigidly connected with it.

Thus, in addition to the force from the actuator, a force Pz is created from the elastic stops 21, which pulls tool 26 out of the stamped forging:

G12 - PZ

The force P3 can be adjusted by changing the stiffness or deformation of the elastic stops 21.

Upon further rotation of the screw 8 and the housing 6, the cross member 16 is lowered, the elastic stops 21 are unloaded, the inner slide 3 rises to the extreme upper position relative to the outer slide 2, and the cross member 16 lowers to the lower position relative to the additional cross member 18.

The housing 6 does not rotate and under the action of the rotation of the screw 8, all the moving parts rise to the extreme upper position and, not income until the elastic stops 25, stop.

In this case, if the force of the elastic stops 21 is insufficient to pull the tool 26 out of the forging, the cross member 16 does not lower and, therefore, when approaching the upper position, it comes into contact with the elastic stops 25,

which create an additional force to the force P2 of the elastic stops 21, and the tool 26 is removed from the forging.

Thus, the elastic stops 25 work 5 only when the clamping force of the tool 26 exceeds the force of the tool 26 to break from the elastic stops 21 and ensures that the tool 26 is removed from the forging, since

10, the force of the elastic stops 25 can be made almost unlimited, made them with variable stiffness, which is difficult to perform on the crossbar 16.

Elastic limiters (figure 2) can be

15 are made in the form of a cylinder 29, the rods 30 of which are connected tightly to the body 13 of the outer slider 2.

Press (Fig, 2) works as follows.

20 Before the start of operation of the press, the outer slider 2 and the elements of the press construction associated with it are lifted to the extreme upper position. Inner slider 3 occupies the topmost position

25 with respect to the outer slider 2. The sleeve 19 abuts against the housing 13. The upper and lower cavities of the cylinders without pressure. Next, the press works in the same way as described until the moment when the stroke occurs

30 warping. There are two cases of the press. During the first deformation, the pressure is supplied to the lower cavity of the cylinder 29 and it performs functions similar to the additional

35 to the hopper 22, securing the pulling out of the punch 26 from the workpiece. In the second case, during the deformation stroke, the pressure is supplied to the upper cavity of the cylinder 29. When the drive is reversed, the flywheel 9 is acted upon

40 torque, causing the flywheel 9 and the screw 8 to rotate. At the same time, the torque M4 in the threads of the nut 15-body 6 and the nut 12-body 6:

45-p

R)

Under the action of the moment from the drive screw 8 begins to rotate in the opposite direction, raising the moving parts, and

under the action of the moment M4, the body 6 rotates in the same direction as during the course of deformation, ensuring the downward movement of the internal slide 3, which allows the workpiece to be pushed out of the upper matrix

27 by a punch 26 with a force PS, which is defined by the expression

. (ten)

The force PS can be adjusted by changing the pressure in the upper cavity of the cylinder 29.

To return the moving parts to their original position, the pressure from the upper cavity of the cylinder is released and fed into the lower cavity. In this case, due to the force Re of the cylinder 29, a torque MB is generated in the threads of the nut 15-body b and nut 12-body 6:

Ms P6 -. (11)

Under the action of the moment from the drive and the moment Ms, the body 6 rotates in the direction of rotation of the screw 8, and the hollow screw rigidly connected to the body 6 lifts the nut 4 and the internal slider 3 rigidly connected with it.

Upon further rotation of the screw 8 and the housing 6, the cross member 16 is lowered, the inner slide 3 rises to the uppermost position relative to the outer slide 2, and the cross member 16 lowers to the lower position relative to the additional cross member 18. The pressure from the lower cavity of the cylinder 29 is released,

0

five

0 5

In this case, the housing 6 does not rotate and under the action of the rotation of the screw 8 all moving parts rise to the extreme upper position and, not income until the elastic stops 25, stop.

Thus, the use of cylinders 29 provides both the tearing of the punch 26 from the forging and the ejection from the upper die.

Claims (2)

Invention Formula 1. The screw press of double action on an auth.St. No. 1613357, differing in the fact that, in order to expand technological capabilities, it is equipped with additional elastic restraints and drafts with stops, additional elastic stoppers are installed on the crossbar, the thrusts are connected to the ends of the outer slide, and on the other ends stops are mounted with the possibility of their interaction with additional elastic restraints. 2. Press according to claim 1, from the article with the fact that it is provided with elastic rests mounted on the lower surface of the upper cross member of the frame. Rig.2