SU716730A1 - Broaching machine for pressing a tool through - Google Patents

Description

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The invention relates to mechanical engineering, in particular, to spinning machines for grinding the holes in tubular billets.

Devices are known for volumetric backing holes of blanks such as long cylinders with limiting axial deformation of the machined billets. This is achieved by axial displacements of one movable head of a support or two movable heads, while all movements of movable heads are provided by the design of the devices themselves. in the absence of external influences 1. The known devices, due to the limiting axial deformation, shorten the workpieces to ensure sufficiently diametric accuracy in individual cross sections, however, along the length of the workpieces, the diametrically sharp holes of the holes are not constant. in various cross sections.

Closest to the advancement of an akyumu machine is a stretching machine, the support of which is equipped with two movable miToles, rigidly connected by a bearing of two soybshchakvdikhs between themselves

hydraulic cavities, provides relative axial displacements of GB. The direction and magnitude of these displacements are determined by the ratio of the cross-sectional areas of the said hydrological cavities. The hydraulic system of the machine tool contains a hydraulic cylinder for the drive of the main movement connected through the main distributor to the pump 2.

This machine does not provide constant diametrical accuracy of the holes along the length of the machined blanks due to the difference in the levels of axial tensile stresses when deforming certain parts of the workpiece, which is one of the characteristic features of the multi-tooth arching.

The purpose of the invention is to ensure constant along the length of the workpiece diametrical accuracy of the holes.

For this proposed machine is equipped with a double piston cylinder,

additional pump and distributor and safety valve, in this case the cavity of the double piston hydrocylinder through the main

the distributor is connected with the rod, the cavity of the hydraulic cylinder of the main engine, the rodless plug is connected to the atmosphere, and the piston space is divided into two spaces by the inner section, and the other from kBfopwx is connected to the hydraulic cavity of the machine support, . The drawing shows schematically the described machine, {/ and the main frame 1 of the machine is equipped with the hydraulic cylinder 2 of the main drive and the auxiliary frame 3 with the feed and retraction drive of the multi-tooth mandrel 4.;. The tta faceplate of the frontal frame 1 is mounted on the support 5 of the machine with an internal hydraulic cavity A AND two heads 6 and 7. The latter are equipped with sliding cams that interact with the tubular workpiece 8. The head b is stationary and is in alignment with the body of the support 5, and the head 7 is mounted with a movable, axially spring-loaded compression spring 9, a tensioning device 10 interacting with the hydraulic cavity A. The hydraulic system of the pulling machine consists of a main motion drive and a control system. moving the tension device 10 of the support 5 of the machine. Both systems having a drain 11 are interconnected by a line with a connected pressure gauge 12 and a safety valve 13. ...-. /: ..;,.: ..- .. -: - . -...: l.,;; -: :::;: The main drive contains a pump 14 connected through the main three-position valve 15 to the cavities of the main drive hydraulic cylinder 2.,, The main element of the motion control system Tensioning device 10 is a two-piston hydro cylinder 16. The rod 6 has a permanently connected to the drive of the main movement of the machine. The inter piston space of the hydraulic cylinder 16 is divided by a partition into two cavities B and G. The cavity B through the additional two-position distribution 1 , 7 may communicate with the drain and with the additional pump 18. Polo G is permanently connected to the hydraulic cavity A of the support 5. In the pressure line of the additional pump 18, a safety valve 19 is installed. The pressure in the hydraulic cavity A of the support 5 is controlled using a pressure gauge 20. Besstokova D-hydrocylinder 16 ftcsef Nyo is associated with the atmosphere. Before installing the piston in the support 5, the piston of the hydraulic cylinder 2 is located in the extreme 1 fi ya 1oZh nyi. The tensioning device 10 under the action of the compression spring 9 is in the extreme right position. Cams heads 6 and 7 are disclosed. The valves 15 and 17 are in position 1. The cavities B and B of the hydraulic cylinder 16 have the same pressure. The pressure in the cavity G is determined by the force of the spring 9 Compress the support 5. To install the workpiece 8 into the support 5, the cams of the heads 6 and 7 capture the workpiece 8 along the previously machined grooves. When the stroke is switched on, both distributors 15 and 17 take the position D. Oil from the pump 14 enters the rod end of the hydraulic cylinder 2 of the main motion actuator and into the STOCK cavity 6 hydrocyles or NDR a 16. At the same time, the hydraulic cylinder 2 of the main motion actuator and the multi-tooth mandrel feed drive mounted on the auxiliary frame 3, under dissolved mnogozubyh mandrel chuck 4 to the working machine. Oil C is fed into the cavity B of the hydraulic cylinders 16 by the pump 18. The pressure in the cavities B and C is the same and is determined by the setting of the safety valves 13 and 19 .. When a multi-tooth 4 is entered into the hole of the workpiece 8, the pressure in the rod of the hydraulic cylinder 2 increases. The pressure in the Aolost B of the hydraulic cylinder 16 also increases and exceeds the pressure in cavity B, as a result of which the rod of the hydraulic cylinder 16 moves to the right, and the oil from the hydraulic cavity A flows into the cavity D and causes the tension device 10 with the head 7 to move to the right, interacting with , the corresponding end of the workpiece 8. The movement of the device 10 to the right continues when entering the All teeth of the multi-teeth-Dorn 4 into the work-pieces 8 and stops when the equal pressure, cavities and B are restored. At the start of the exit of the multi-tooth molecular weight of 4. billet 8, the pressure in the rod end of the hydraulic cylinder 2 and in the cavity B of the hydrocyle driver 1b begins to fall. The rod of the hydraulic cylinder 16 is moved to the left by the action of an axial force determined by the section. The pressure in the cavity f and B is removed. The oil from the cavity D is displaced into the cavity A, moving the tensioner 10 to the left and creating an additional tension force at the end of the -. cooking 8, proportional to the pressure drop in the rod cavity of the hydraulic cylinder 2. This movement occurs until the last tooth of the multi-tooth mandrel 4 leaves the workpiece 8; ..; , , „, .--: .. ,, ,, -. ..-. . I The machine is reversed by setting the distributor 15 to position 111.

Claims (2)

1. USSR author's certificate number 410888, cl. B.23 D 41/04, 1966. five 2. USSR author's certificate number 553060, cl. In 23 D 41/04, 1975 (prototype). - f Wl 13 ±: EG-I