UA16393U - Device for retention of the moving elements of high-speed hammers - Google Patents

Abstract

A device for retention of the moving elements of high-speed hammers contains moving elements in the form of a working cylinder-accumulator connected with columns, a frame with a cross-beam, and a plunger located in the cylinder-accumulator and tightened with it, said plunger is connected with a ram, and on the cross-beam and the ram a tool is mounted, for example, a die. Furthermore, on the cylinder-accumulator the retaining devices are located in the form of airtight slots enveloping the plunger of airtight slots, connected by channels with the source of control pressure, in this case the frictional force on the retaining devices is greater than the maximum effective force, which acts on the plunger in the cylinder-accumulator.

Description

Description of the invention

The useful model refers to the field of mechanical engineering, namely to the processing of materials by pressure and can find 2 applications in the creation of forging and stamping equipment with an executive mechanism of the impact line and a spring drive.

The known design of the high-speed hammer | Patent KO 2225276 C2, IPC 821 47/24. High-speed hammer/ V.M. Pachevskii, A.V. Ivanov, I.H. Polyakov. Application 31.05.2002. Publ. 10.03.20041, containing a frame, a woman with an axial cavity and a woman holding mechanism. A plunger is placed in the axial cavity of the woman, which is 70 hingedly connected at one end to the crank-rod mechanism for driving the hammer. The mechanism of holding the woman is made in the form of spring-loaded latches installed on it, which are placed on the bed, rotary pins and rotary cams. The latter are installed on a frame, connected to each other by a synchronizing rod, and connected to power electromagnets, which are controlled from the control unit. Each pivot key is supplied with a spring-loaded lever. The mentioned levers rest on rotary cams. The disadvantage of the known design 12 of the device for holding moving parts is the complexity of the design due to a large number of parts, limitation of efforts, reduced durability due to wear of complex parts.

A device for holding the moving parts of a high-speed hammer is also known |Y.P. Sogryshyn,

L.G.Gryshin, V.M.Vorobyev. Stamping on high-speed hammers, M. Mashinostroenie, 1978. p. 43, fig. 14), which is made in the form of a seal on the end of a plunger inserted into the working cylinder of the hammer, where there is a pressure of the working medium, and the size of the seal on the end of the plunger is greater than its seal at the exit from the cylinder, the cavity under the end seal is connected to the drain, or pressure to hold the moving parts and to start their movement.

The disadvantage of this holding device is a decrease in the reliability of operation, difficulties in its maintenance, since the seal is placed in the working environment inside the cylinder, the lack of an opportunity to reduce the stroke of the woman, if necessary. 29 The closest analogue of the claimed device, chosen as a prototype, is a device for holding moving parts of a high-speed hammer

Roganov L.L. Application 03.01.77. Publ. 28.08.78, Byul.Mo31), which contains a bed, in the upper part of which there is a low-pressure charging cylinder and a high-pressure working cylinder. A plunger is placed in the working cylinder, which is connected to the hammer carrying the tool. The upper end of the plunger enters the closed cavity of the working 30 cylinder. The device for holding the moving parts is made in the form of a piston with an elongated sleeve that covers the plunger and is placed on the charging cylinder. The sleeve has holes around the perimeter in which the balls are placed. The diameter of the balls is greater than the thickness of the sleeve wall. In the place where the balls are located, the sleeve is covered by a locking bushing, which is spring-loaded relative to the sleeve with springs. Ring grooves are made in the sleeve and plunger, where the balls can enter, while the sum of the thickness of the sleeve wall and the depth of the grooves is equal to the diameter of the balls. 35 The general essential features of the known and claimed device are a cylinder - accumulator, connected by columns (7 with a crossbar, placed in the cylinder - accumulator, a plunger is sealed with it, rigidly connected to the woman, and a tool is installed on the crossmember and woman, such as a stamp.

The disadvantage of the known design of the device for holding the moving parts of the high-speed hammer is the complexity of the design, limitation of efforts, low reliability and durability of the device due to the presence of Z 70 ball joint, the balls and grooves of which are subject to rapid wear and jamming in working conditions with constant reverse. In addition, the operation of the device depends on the stiffness of the springs that connect the sleeve,

Because it locks, the sleeve and the movement of the barrel cannot be adjusted.

The basis of the useful model is the task of improving the device for holding the moving parts of the high-speed hammer, in which, by eliminating the dependence of the device on mechanical connections 45, the aforementioned shortcomings are eliminated. - The task is solved by the fact that holding devices are placed on the accumulator cylinder

Gee! sealing gaps covering the plunger, connected by channels to the source of control pressure, while the frictional force on the retaining devices is greater than the maximum force acting on the plunger in the cylinder-accumulator. In order to reduce this force, the plunger can be made stepwise, coming out of the cylinder-accumulator on two (Te) 20 sides, and on each output part of the plunger in the cylinder-accumulator there are sealed gaps connected to the source of control pressure. c» In order to increase the holding force, the plunger is rigidly connected to additional rods, which are covered by additional bushings installed on the cylinder-accumulator, and the hermetic gaps placed in the bushings are connected to the source of control pressure.

The proposed design provides simplification of the device and its maintenance, allows you to start the movement of the woman from any position, reduce the active force, in turn, the holding force, due to the stepwise execution of the plunger, increase the reliability of work due to additional (as necessary) holding slots.

The essence of the proposed useful model is explained by the drawing, which shows the schemes of devices for holding the moving parts of high-speed hammers. Device for holding moving parts of the hammer Fig. 1, Fig. 60? contains moving parts in the form of a working cylinder-accumulator 1, connected by columns 2, or a frame Z to a crossbar 4, and which has a seal 7. A plunger 5, connected to a woman 6. A tool is installed on the crossmember 4 and woman 6, for example stamp 8. In the cylinder-accumulator 1 there is a sealed gap 9, which covers the plunger 5. Through channel 10, liquid under charging pressure enters the working cavity of the cylinder-accumulator 1, through channel 11, liquid under pressure recirculates to the sealed gap 9. In Fig.2 the plunger 5 is made stepwise, coming out of the cylinder - battery 1 on two sides, and on each output part of the plunger 5 in the cylinder 1 there are hermetic gaps 9 and 12, connected by channels 11 and 13 to the source of control pressure. The plunger and the woman 6 are rigidly connected to the rods 14, which are covered by additional bushings 15 installed on the cylinder - battery 1, and in the bushings 15 there are sealed gaps 16, connected by channels 17 to the control pressure source 5, which is not shown in the drawings.

The device for holding the moving parts of high-speed hammers works as follows. In the initial position, the piston 6 with the plunger 5 (Fig. 1, 2) is in the lower position, since there is no pressure in the cavity of the working cylinder. In the hermetic gap 9, as well as in the gaps 12, 16 (Fig. 2), the control pressure of the fluid is fed from the pressure source - reruyyu: Due to the deformation of the wall of the hermetic gaps 9, 12, 16, the plunger 5, rods 14 become clamped /o0. The working pressure is supplied p in the working cavity of the cylinder 1, the pressure acts on the active area of the plunger, creates an active force Ha, which is counteracted by the mass of the plunger 5, female 6, rods 14 and the frictional force E of friction at the contact of the plunger 5 and rods 14 with the walls of the slots 9, 12, 14. The force of friction must be greater than the active force. In the cylinder-accumulator 1, the potential energy of the elasticity of the liquid and metal parts accumulates. To start the moving parts of the hammer, the slots 9, 12, 14 are connected to the drain, the frictional force disappears and the active force pushes /5 the plunger 5 with the nut 6 out of the cavity of the cylinder 1, the potential pressure energy is converted into the kinetic energy of the nut movement. At the end of the movement of the moving parts in the dies 8, the workpiece is deformed. The pressure in cylinder 1 drops, its cavity is connected to the drain and the valve b with the plunger 5 reverses, after which the cycle of the device is repeated.

Making the plunger 5-stage allows to reduce the active force and, as a result, the frictional force for holding 2o moving parts of the hammer, while the necessary energy of the hammer is provided by increasing the stroke of the moving parts.

The proposed design of the device allows you to start the movement from any position of the plunger 5 relative to the cylinder-accumulator 1, which allows you to adjust the impact energy, reduce the cycle time, leave the stamps 8 compressed after the impact, if necessary according to the technological process.

Claims (2)

29 Formulas of the invention - 1. A device for holding moving parts of high-speed hammers, containing moving parts in the form of a working cylinder-accumulator, connected by columns, a frame with a crossbar, and a plunger sealed with it, connected to the woman and on a tool, such as a stamp, is installed on the crossbar and the woman, which differs in that the retaining devices are placed on the accumulator cylinder in the form of enclosing (9 plunger) hermetic gaps connected by channels with the source of control pressure, while the friction force on the retaining devices is greater than the maximum active forces acting on the plunger in the accumulator cylinder. 2. A device for holding moving parts of high-speed hammers according to claim 1, which is characterized by the fact that "( with 5) the plunger is made stepped, coming out of the cylinder-accumulator on two sides, and on each output part "- the plunger in the cylinder-accumulator has sealed gaps, associated with a source of control pressure. C. A device for holding moving parts of high-speed hammers according to claim 1, characterized in that the plunger is rigidly connected to the rods, which are covered by additional bushings mounted on the accumulator cylinder, and in the bushings there are sealed gaps that are connected to the source control pressure. " - . and? - (o) (95) se) syu" 60 b5