SU1622117A1 - Arrangement for blanking parts from elastic material - Google Patents

Abstract

The invention relates to light industry can be used n; shoe, garment, and leather haberdashery enterprises and allows to increase the reliability and durability of the device. The device for cutting out parts from elastic material comprises a pressure table 1 with a cutting torch 2 and a cutting plate 3 of two layers. The top layer of the plate 3 is made of electrically insulating thermoplastic polyvinyl chloride, and the bottom layer is made of electrically conductive thermoplastic polyvinyl chloride with metal fittings 4. The metal fittings 4 are made in the form of a grid and placed in the body of the plate offset from its working surface. The device also has means 6 for disabling the stroke of the pressure table 1 at the time of completion of the punching due to the closing by cut 2 of the electric circuit. The hardness of the electrically conducting thermoplastic polyvinyl chloride should be 90-100 units. by. Shora A. 2 Il. (C1 (L

Description

FIG. one

The invention is intended for the manufacture of shaped blanks of elastic sheet material, namely for cutting blanks of leather, woven materials, rubber sheet and can be used both at light industry enterprises (shoe, garment, leather goods), and at rubber factories. products.

The aim of the invention is to increase the reliability and durability of the device.

FIG. 1 shows a device for cutting out an elastic material, a general view; in fig. 2 is a section A-A in FIG. one.

The device for cutting a part from elastic material contains a cutting press with a pressure table 1, a cutter 2 with a blade made in the form of a blank cut from an elastic material, a cutting plate 3 made of electrically conducting thermoplastic polyvinyl chloride with metal fittings 4 in the form of a grid located in the body of the punching plate 3, the electrically insulating layer 5 of the thermoplastic polyvinyl chloride and the means 6 for shutting down the pressure table 1 at the moment of completing the cutting by closing the electric circuit between the press 2 A table 1 and a cutting plate 3. The cutting plate 3 is made of electrically conducting thermoplastic polyvinyl chloride, which allows shutting off the movement of the pressing table 1 at the moment of its contact with the surface by the cutter 2 when cutting the workpiece. The hardness of electrically conducting thermoplastic polyvinyl chloride should compare 90-100 units. Shore A. The use of a material with lower hardness leads to a strong cutting in of the cutter 2 in the body of the cutting plate 3 due to the inertia of the moving parts of the press.

In the body of the cutting plate 3 press ---. that metal fittings in the form of a grid,

Targeting the same resistance: to the electric current when touched by the cutter 2

:, the working surface of the cutting plate 3 at the favorite point of its surface and reliable fixed metal fittings 4 without the use of non-ferrous metals due to

sh-canin polymer in mesh cells. Mesh cells should be in the range of 4 mm, which is associated with poor flow of the polymer into smaller cells and a very weak grid fixing.

in TIM. base plate, as well as insufficient stability of the resistance to electric current on the working surface for large cell sizes.

H: i The working surface of the cut-out pl-, m L is applied a protective electrically insulating layer of thermoplastic polyvinyl chloride, which prevents before-timed disabling of the push-down stroke until full cutting of the cuttable

five

0 0 5

five

0

five

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material 7 around the perimeter of the cutter 2, which is due to the inevitable distortions of the cutting plate 3 and the pressure table 1, as well as the different height of the cutter 2 along the perimeter. The thickness of the electrically insulating layer 5 is selected in accordance with the thickness of the material to be cut 7, but not more than the height of the cone sharpening of the blade of the cutter 2, which allows you to easily remove the cutter 2 from the punching plate 3 due to the effect of the pushing force when the cut of the electrically insulating layer is closed.

Device for cutting parts from elastic material works as follows.

The material to be cut 7 (Fig. 2) is placed on the working surface of the punching plate 3. At the same time, the electrical circuit of the means for shutting off the stroke of the pressure plates is closed. Then, under the action of a hydraulic or other force mechanism (not shown) of the punch press, the pressure table 1 is lowered and transmits the force of the cutter 2, which with its blade cuts through the material to be cut 6, and then the layer 5 of insulating thermoplastic polyvinyl chloride touches the working surface of the cutting plate 3 from the wire thermoplastic polyvinyl chloride. This closes the circuit of the means 6 for shutting off the stroke of the pressure table 1 and everything returns to its original position. The cut blank is removed, and a new sheet of material being cut 7 is laid in its place.

After long-term operation, the layer 5 of the insulating thermoplastic polyvinyl chloride and partially the surface of the electrically conductive cutting plate 3 is damaged by the cutter 2. To restore the working surface of the punching plate 3, the cuts made by the cutter 2 are melted by treating with a metal plate heated to the melting temperature of the polyvinyl chloride for several seconds . Due to the fact that the cutter 2 is not in contact with metal when cutting, its blade taps much less, and the service life of the knife and the quality of cutting are significantly increased compared with the known. The use of a cutting plate 3 of an electrically conductive thermoplastic polyvinyl chloride as a material makes it possible to restore its working surface after prolonged use and, thus, to increase the durability of the device.

The use of grid 4 as metal reinforcement ensures its good electrical contact and reliable fastening in the body of the base plate without the use of adhesives and non-ferrous metals due to polymer leakage into the grid cells.

The application of a protective electrically insulating layer 5 of thermoplastic polyvinyl chloride on the working surface of the cut-out plate 3 provides the opening of the workpiece along the entire perimeter of the cutter 2, which also increases the reliability of the device.

The device allows to reduce material and labor costs when cutting sheet elastic materials.

The economic efficiency of the proposed device consists in increasing the service life of the base plates and the associated reduction in material and labor costs.

Claims (1)

Invention Formula A device for cutting out parts made of elastic material containing a push a plate with a cutter and a cutting plate located under them and consisting of several layers placed one below the other, the lower layer being made of an electrically conductive polymer and having metal reinforcement in its body, characterized in that, in order to increase durability, the upper layer the cutting plate is made of electrically insulating thermoplastic polyvinyl chloride, the thickness of which is less than the height of the sharpening blade cutter, and the displacement of metal reinforcement, made in the form of a grid, relative to the surface of the lower layer of the notch plate facing its upper layer, equal to the greater the height of sharpening the edges of the cutter. Fe & .g s h