Apparatus for plastic upsetting of flat blank at shearing it

FIELD: plastic working of metals in different branches of industry.

SUBSTANCE: apparatus includes supporting plate and housing with openings and duct. Punch, upper and lower stops are mounted in housing. Said stops may be in contact with blank by their flat notched surface. Movable lower stop is arranged in openings of housing and on supporting plate; it engages with said plate by its smooth surface. Hydraulic cylinder joined by its rod with lower stop is mounted on supporting plate. Upper stop is in the form of cylinder mounted in housing in such a way that it restricts together with punch inner cylindrical cavity of hydraulic system providing motion of lower stop. Said hydraulic system also includes duct of housing and hydraulic cylinder.

EFFECT: enlarged manufacturing possibilities of apparatus due to increased range of changing relation of shear deformation to compression deformation of blank.

2 dwg

 

The invention relates to the field of metal forming and can be used in mechanical engineering, aircraft construction, shipbuilding and other industries for the plastic shaping of workpieces, for example, in the development of high technology mechanical and thermal processing.

A known design of the device [1] to implement the process of plastic precipitation shifted billet. The device comprises a cylindrical housing, coaxially fixed punch and the support plate, between which through two racks with inclined grooves installed rectangular upper and lower lugs in contact with the machined workpiece on a flat surface with notches and with the punch and the support plate on smooth surfaces.

The disadvantages of this device is the inability of the deformation of the workpiece with respect to shear strain (γ) to the relative deformation (ε), variable over a wide range due to the rigid coupling between the lugs carried out through two racks.

The invention is aimed at enhancing the technical capabilities of the device by increasing the range of change of a ratio of shear deformation to the deformation of the workpiece.

This is achieved by the fact that the body is made of the channel and the hole in which the base plate is placed lower UE is R, connected with the rod and piston mounted on the base plate of the cylinder, and the top is made in the form of a cylinder stop and the punch is formed in the housing inner cylindrical cavity.

Figure 1 shows the main structure of the device, figure 2 is a view along arrow A.

The unit contains the following main elements. A cylindrical housing 1 made by channel 2 mounted rigidly on the base plate 3. The case contains in its cylindrical hole on a sliding landing the punch 4 and the top is made in the form of a cylinder stop 5, and the lower rectangular stop 6 is installed on a smooth surface on the base plate 3 with the ability to navigate through it and made on opposite sides of the casing wall 1 of the openings of rectangular shape. The upper stop 5 is installed with the formation in the body of the punch 4 internal cylindrical cavity, which is part of the hydraulic system to move the bottom of emphasis, including the channel of the casing and cylinder. The plate 3 is fixed to the hydraulic cylinder 7, the piston 8 with the rod 9 which is connected with the lower stop 6. The device also contains the necessary to move the stop 6 of the hydraulic system, which includes an internal cylindrical cavity, channel 2, line 10, the orifice 11, the hydraulic cylinder 7 and a piston 8.

In order to reduce the friction of the contact between the lower ends of the stop 6 and the support plate 3 is recommended to place the anti-friction layer, for example, the fluoropolymer film thickness of ~ 50 ám.

For plastic processing through holes (C) in the case 1 is installed between the lugs 5 and 6 on smooth surfaces with notches flat workpiece 12.

The device after Assembly together with the workpiece placed on the working plate of the press and produce plastic processing of the workpiece.

When the application of force f to the punch last 4 moves downward. When this force P is transmitted through the working fluid in the cylindrical cavity and the upper stop 5 to the workpiece 12, and through it the lower stop 6.

Thanks to the hydraulic working fluid from the cavity In the pressure p1will move to channel 2, the pipe 10 and through the orifice 11 in the cylinder chamber 7 and to move the piston 8 with the rod 9, and thus the lower stop 6 to the left (see figure 1). When this force that causes a shear deformation in the workpiece 12 will be equal to

where D2- inner diameter of the cylinder 7; p2- modifiable using the throttle 11 and the fluid pressure in the cylinder.

The fluid pressure in the cavity is determined by the ratio

where D1- the diameter of the cylindrical cavity Century

Thus, the workpiece 12 will be subjected to a compression force P and the shear force T due to the notch is in contact with the workpiece and the ends of the lugs 5 and 6. At the same time, changing with the throttle 11 pressure p2you can change the ratio of shear to compressive deformation in a wide range, which in the case of complete closure of the orifice 11 of the access of the working fluid (p2=0) in the cylinder chamber 7, the workpiece 12 will only okazyvatsya.

After processing the workpiece to the desired degree of deformation applied to the plunger 4, the load is relieved. Under the influence of the compressed spring 13 mounted on the rod 9, the piston 8 with the rod 9 and the lower stop 6 will move to the right to its original position, and thus thanks to the hydraulic system return the punch 4 in the upper initial position.

The proposed device allows comparison with the prototype to better control the precipitation process with a shift in a wider range, which is very important for the development of high technologies in the processing of metals by pressure.

SOURCES of INFORMATION

1. RF patent №2134414, G 01 N 3/08. from 10.08.99. Bull. No. 22.

Device for plastic precipitation with the shift of flat blanks containing the support plate and the housing in which is located the plug and installed with the possibility of contact with the workpiece flat surface with the notch of the upper and lower stops, the last of which is mounted on the base plate in contact with it its smooth surface and opportunities the Yu move, characterized in that it is provided with a fixed on the base plate by a hydraulic cylinder, the body is made with holes, which are placed in the lower stop connected with the rod and the piston of the above-mentioned cylinder, and a pipe, and the upper stop is made in the form of a cylinder and is installed with education in the housing together with the punch of the internal cylindrical cavity, which is part of the hydraulic system to move the bottom of emphasis, including the channel of the casing and cylinder.



 

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FIELD: plastic working of metals in different branches of industry.

SUBSTANCE: apparatus includes supporting plate and housing with openings and duct. Punch, upper and lower stops are mounted in housing. Said stops may be in contact with blank by their flat notched surface. Movable lower stop is arranged in openings of housing and on supporting plate; it engages with said plate by its smooth surface. Hydraulic cylinder joined by its rod with lower stop is mounted on supporting plate. Upper stop is in the form of cylinder mounted in housing in such a way that it restricts together with punch inner cylindrical cavity of hydraulic system providing motion of lower stop. Said hydraulic system also includes duct of housing and hydraulic cylinder.

EFFECT: enlarged manufacturing possibilities of apparatus due to increased range of changing relation of shear deformation to compression deformation of blank.

2 dwg

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