RU2167050C1 - Cutting-out plate - Google Patents

Abstract

FIELD: footwear manufacture. SUBSTANCE: cutting-out plate consists of two detachably-jointed parallel half-plates one of which is made of thermoplast and the other, strong material in the form of trough with bead. The latter is made over perimeter so that clearance between bead and half-plate made of thermoplast increases from base upwards. Provision is also made for recovering element which ensures recovery of thermoplast on surface. Said element is represented by plasticizer solution placed between conjugated surfaces of half-plates for plasticizing of thermoplast plate. Trough-shaped half-plate is made of paper-based laminate. EFFECT: reduced cost price, prolonged service life. 1 dwg

Description

 The invention relates to the light industry, more specifically to the production of shoes, and can be used in cutting and cutting shops of shoe factories or in workshops for individual tailoring of shoes to increase the life of technical equipment for cutting production.

 Cutting boards of similar purpose are diverse in design and are designed so that when cutting by cutting, they placed sheet material and, due to a blow to the cutter, receive a part of the required configuration. Plates having a parallel work surface and perceiving a shock are called rigid, and their body is made of metal, wood, cardboard, plastic, for example, thermoplastic - polyvinyl chloride (PVC) ("Design and calculation of shoe and sewing machines" / Textbook ed. A.I. Komissarova, Moscow: Mashinostroenie, 1978, p. 58-59).

 Plates made of these materials have the same drawback - low durability. For example, AL-9 aluminum plates are used for no more than 2 shifts, then it is no longer possible to carry out high-quality cutting, and they have to be cut by milling, eliminating the non-parallelism defect of the working and supporting surfaces. To increase durability, gaskets are glued onto the work surface (fabric with latex applied to the surface). However, this event does not significantly (1-2 shifts) increase their service life. One of the ways to restore the cutting plate is to place heating elements in it (Copyright certificate SU N 926011, class C 14 B 5/00, 1982).

 The disadvantages of this method are the high energy consumption required to restore the working surface; when one of the heating elements fails, the stove does not recover.

 The closest technical solution to the claimed invention is a cutting plate that does not have the above disadvantage, its resource is much higher. The cutting plate consists of two detachably connected parallel half-plates, one of which is made of thermoplastic, and the other is made of durable material - metal in the form of a trough with a shoulder, which is made around the perimeter so that the gap between this shoulder and the half-plate of thermoplast increases from the base to top, and from the recovery element, providing the restoration of the thermoplastic over the surface due to the presence of heating elements in one of the half-plates (patent RU 2135057 C 1, class A 43 D 8/04; 1999). Under the influence of heating elements, the thermoplastic softens and under the influence of the impactor the press is leveled.

The disadvantages of such a plate are:
- the need to place heating elements in the body of the lower metal plate;
- energy costs for heating the thermoplastic;
- to prevent sticking of half-plates, the flat bottom of the metal half-plate should have a high processing frequency or should be polished.

 The manufacture of a metal half-plate with shadows mounted in it leads to a significant increase in the cost of such a plate and requires the availability of switching devices to turn on and off the power of its heating elements.

 The objective of the technical solution according to the invention is to simplify the design, reduce the cost of the cutting plate and reduce the cost of its operation.

 The task is achieved in that the cutting plate consists of two detachably connected parallel half-plates, one of which is made of thermoplastic, and the other is made of durable material in the form of a trough with a shoulder, which is made around the perimeter so that the gap between this shoulder and the half-plate is made of thermoplastic increases from the base to the top, and from the recovery element, which ensures the restoration of the thermoplastic over the surface, in which a plasticizer solution placed between mating surfaces of the half-plasticizing poluplity thermoplastic and poluplita shaped trough made of Micarta.

 The essence of the proposed technical solution is illustrated by a drawing depicting a cutting plate. The cutting plate consists of two half-plates made of thermoplastic - 1 and getinaks in the form of a trough with a flat bottom - 2. The shape of the trough is given by a shoulder made along the perimeter of the lower half-plate so that the gap between this shoulder and a half-plate made of thermoplastic increases from the base to the top. The size of this gap should provide a landing landing of a half-plate from a thermoplastic in a half-plate from getinaks. Between the half-plates there is a reducing element - 3 solution. To prevent sticking of half-plates, the flat bottom of the half-plate of hetinax is coated with grease, which is used as a variety of soaps, paper can be used. The thickness of the thermoplastic half-plate can be standard, for example 30-40 mm, the lower half-plate thickness is 10-15 mm.

 The cutting plate works as follows: a plate consisting of two detachably connected half plates is installed on the frame of the cutting press with the working surface facing the hammer. Lay sheet material on the working surface, and a cutter is mounted on it. Perform a blow to the cutter (press, drummer and cutter in the drawing is not shown). The torch, pressing on the material, cuts it with its wedge blade and is somewhat embedded in the working surface of the plate.

 In the process, as a result of chipping the working surface of the plate, its performance is lost. The appearance of holes and a visual assessment of the degree of wear of the working surface, determine the need for the next stage of its work: the upper half plate is removed from the bottom, turned over by the worn surface down and re-installed. At the bottom of the "trough" of the lower half-plate, a reducing solution is placed, consisting of granules or shavings of PVC, a solvent and a substance that promotes the redistribution of particles on the working surface of the thermoplastic. Such substances are plasticizers, for example dibutyl phthalate (DBP). Since PVC molecules have a linear structure, the plasticizer partially functions as a solvent. Particles under the action of DBP swell, and accordingly, the distance between them is reduced, which contributes to their fusion. This reaction is exothermic, which in turn also helps to restore the working surface of the thermoplastic. As a result of softening the worn-out surface of the half-plate and under the action of the impactor of the press, high edge sections are compressed and floated, filled as a result of plastic deformation, the middle part of the plate, where its greatest spalling occurs. Empirically determine the volume of the solution, which must be added to minimize thinning of the plate after softening its surface.

 Then they continue to work until the maximum wear of the new work surface. Plasticization of the half-plate made of PVC continues for 0.6-0.7 hours, after which the half-plate is again turned over, and all the above described on the restoration of the working surface is repeated. Work on one working surface of the half-plate is combined with the restoration of its other working surface. The cycle can be repeated many times, significantly increasing the life of the plate as a whole. The thermoplastic half-plate is a replaceable element, and the getinax half-plate is of multiple use, because in operation does not wear out.

 It is the execution of the cutting plate according to the invention from two half-plates so that one of them, the upper one, has good cutting characteristics, and the other, the lower one, restores the working capacity of the upper one, while performing its functions, ensures the achievement of the goal, and increases the resource of technological equipment. The presence of a reducing element between the half plates of the reducing solution simplifies the design of the lower half plate and eliminates the use of heating elements. The efforts developed by the drummer of the press for cutting parts are also used to restore the working surface of the half-plate. At the same time, operations to turn on and off the heating elements to soften the thermoplastic plate are excluded. A standard PVC plate used as a half-plate according to this description, after repeated restoration, undergoes slight thinning (10%), without loss of performance. In the technological operations of cutting, with the restoration of worn surfaces, plates previously selected for melting or disposal due to excessive thinning can also be used. During the operation of such a plate, electricity is not consumed for heating the thermoplastic.

 The implementation of the lower half-plate in the form of a trough without thermal heaters, which does not require the presence of a thermal pad between the press bed and the lower half-plate, reduces its cost. Replacing heating elements with a reducing element (reducing solution) placed between the half-plates gives the following advantages.

The cost price of the lower half plate is reduced, since:
- simplifies its manufacture;
- the costs of its manufacture are reduced (a getinax plate is much cheaper than a metal plate);
- the stove is not equipped with heating elements.

Operating costs are reduced:
- no electricity is required for heating;
- eliminates the cost of a switching device that turns on and off the heating elements and equipment that controls the heating temperature.

Claims (1)

 Die cutting plate, consisting of two detachably connected parallel half-plates, one of which is made of thermoplastic, and the other is made of durable material in the form of a trough with a shoulder, which is made around the perimeter so that the gap between this shoulder and the half-plate of thermoplast increases from the base to the top, and from a reducing element providing for the restoration of the thermoplastic over the surface, characterized in that a plasticizer solution placed between the conjugated surfaces is used as the reducing element and half-plasticizing poluplity thermoplastic and poluplita shaped trough made of Micarta.