RU206568U1 - EDGE SLOT CUTTING DEVICE - Google Patents

Abstract

The utility model relates to the field of cutting materials and can be used to form edge grooves in sheet blanks from composite materials with a low-melting matrix, from materials prone to sticking, such as paraffin, ceresin, their alloys and other wax-like materials. A device for cutting edge grooves in sheet blanks made of composite materials with a low-melting matrix contains a base, a cutting unit installed above the working surface of the base and containing at least one vertically mounted knife made with a profile that coincides with the profile of the groove being formed, while cutting the edge of the knife is located above the working surface of the base, a toothed rack engaging with a toothed sector pivotally connected through a frame with a pressure lever, and the cutting unit contains an extraction mechanism located above each knife and containing a pusher with a spring connected to a piston made in the form the inner contour of the knife and located in the inner contour of the knife with a clearance between the piston and the knife of 0.3-0.5 mm, and the pushers are interconnected by means of a pressure bracket. A deformable substrate, made, for example, of cardboard, is located between the workpiece and the working surface of the base. The proposed device allows cutting edge grooves with improved edge quality in sheet blanks made of composite material with a low-melting matrix prone to sticking, preventing the material of the cut grooves from getting stuck. 1 wp f-ly, 4 dwg.

Description

The utility model relates to the field of cutting materials and can be used to form edge grooves in sheet blanks made of composite materials with a low-melting matrix.

In a number of devices, composite materials with a low-melting matrix are used, for example, from paraffin, ceresin, their alloys and other wax-like materials reinforced with fiber, paper, and non-woven materials. Composite materials with a low-melting matrix are characterized by a low modulus of elasticity and tend to stick to the processing tool. These materials are widely used as phlegmatizers, which are an integral part of the propellant charge of an artillery shot. Special requirements are imposed on the quality of the edges of the phlegmatizer, since the operational characteristics of the phlegmatizer, and, consequently, the ballistic properties of the charge, depend on the clarity of the geometric contour of the edges. One of the structural elements of the phlegmatizer is the edge grooves. The main problem of the process of obtaining such grooves is the tendency of the material of the phlegmatizer to stick to the cutting surfaces of the knife, which, with repeated use, can lead to clogging of the inner contour of the knife by the cut material of the sheet blanks, as a result of which the cutting conditions will worsen and the quality of the resulting edges of the grooves will decrease.

The closest analogue to the claimed device is a cutting device, [RF Patent 2219047, publ. 12/20/2003], containing a movable knife that reciprocates in the direction perpendicular to the horizontal plane of the base, as well as a base with stops that ensure positioning of the workpiece during cutting. The disadvantage of this device is the lack of means for extracting the cut material of the workpiece, as well as the placement of the workpiece on a substrate of solid material, which does not allow the edge of the knife to fall below the lower surface of the sheet workpiece and ensure the required quality of the edges of the workpiece.

The objective of the proposed technical solution is to create a device for cutting through a sheet blank made of a composite material with a low-melting matrix, prone to sticking, edge grooves with improved edge quality, while preventing the sheet blank material from getting stuck in the inner contour of the knife.

The technical result is achieved due to the inventive design of a device for cutting edge grooves in sheet blanks made of composite materials with a low-melting matrix, containing a base, a cutting unit installed above the working surface of the base and containing at least one vertically mounted knife made with a profile that matches with the profile of the groove being formed, while the cutting edge of the knife is located above the working surface of the base, a toothed rack engaging with a toothed sector pivotally connected through a frame with a pressure lever, and the cutting unit contains an extraction mechanism located above each knife and containing a pusher with a spring connected to a piston made in the shape of the inner contour of the knife and located in the inner contour of the knife to provide a gap between the piston and the knife of 0.3-0.5 mm, and the pushers are interconnected by means of a pressure bracket.

In the device for cutting edge grooves between the workpiece and the working surface of the base, there is a deformable substrate made, for example, of cardboard.

The preferred thickness of the substrate is 1-2 mm. The thickness of the deformable substrate less than 1 mm does not provide it with sufficient rigidity at the stage of processing. Thickness of the deformable substrate more than 2 mm is excessive.

The vertical feed mechanism limits the stroke of the knife at the end of the working stroke in such a way that the cutting edge of the knife is 0.1-0.5 mm below the bottom surface of the processed sheet blank. The exit of the cutting edge of the knife in the process of processing for the lower surface of the sheet blank less than 0.1 mm does not provide the required quality of the edges of the grooves. The exit of the cutting edge of the knife during processing beyond the lower surface of the sheet blank of more than 0.5 mm is excessive, since this reduces the resource of the deformable substrate.

The gap between the piston and the cutting edge of the knife less than 0.3 mm is too small and causes the piston itself to jam, and the gap more than 0.5 mm does not provide the required quality of extraction of the sheet material.

The extraction mechanism provides the movement of the lower surface of the piston to a position below the cutting edge of the knife at a distance of at least 0.5 mm, but not more than the thickness of the piston. Moving the lower surface of the piston below the cutting edge of the knife by a distance of less than 0.5 mm does not ensure the extraction of the material of the sheet blank due to the high plasticity of the material, and movement to a distance exceeding the thickness of the piston causes problems in the functioning of the extraction mechanism, since the piston completely leaves the inner contour of the knife.

The device for cutting edge grooves is illustrated by the following drawings, where:

in fig. 1 - shows a general isometric view of the claimed device;

in fig. 2 - isometric section of the device along the pusher;

in fig. 3 - cross section of the device along the axis of the pusher;

in fig. 4 - sheet blank with made edge grooves. The device for cutting edge grooves contains a base (1), a cutting unit (2) installed above the working surface of the base (1) and containing at least one vertically mounted knife (3), made with a profile that coincides with the profile of the groove being formed. The cutting edge of the knife (3) is located above the working surface of the base (1). The cutting unit (2) contains a toothed rack (4) engaging with a toothed sector (5), pivotally connected through a frame (6) with a pressure lever (7). The cutting unit (2) also includes an extraction mechanism located above each knife (3). The extraction mechanism consists of a pusher (8) with a spring (9). The pusher (8) is rigidly connected to the piston (10), made in the shape of the inner contour of the knife (3) and located in the inner contour of the knife, providing a gap between the piston and the knife of 0.3-0.5 mm. The pushers (8) are interconnected by means of a push bracket (11). A deformable substrate (12) is located in the recess of the working surface of the base (1). On the base (1), limiters (13) are installed on both sides of the deformable substrate (12). The presence of a spring (9) installed between the frame (6) of the vertical feed mechanism and the cutting unit (2) allows the cutting unit (2) and the pressure lever (7) to return to their original position. The presence of a spring (9) located between the cutting unit (2) and the pressure bracket (11) of the extraction mechanism allows the piston (10) to return to its original position. The device is fixed in place at the workplace.

The device works as follows. Initially, a deformable substrate (12) is placed in the recess on the working surface of the base (1), then a sheet blank (14) of the phlegmatizer is placed on top of the substrate (12), so that the sheet blank is between the limiters (13). After placing the workpiece (14) in a predetermined position, it is cut. For this, a force is applied to the pressure lever (7), tilting it towards the base (1). The toothed sector (5), rigidly connected to the pressure lever (7), while turning, transmits the force to the cutting unit (2) by engaging with the toothed rack (4). In turn, the cutting unit (2), descending, cuts the sheet blank with a knife (3), leaving its cutting edge below its lower surface and cutting into the deformable substrate (12) to a depth of 0.1-0.5 mm. After the cut has been completed, the spring (9) is released, returning the cutting unit (2) and pressure lever (7) to their original position. Applying a force to the pressure bracket (11) of the extraction mechanism, the piston (10) is lowered, which displaces the cut material of the sheet blank from the inner contour of the knife (3). Then the spring (9) returns the piston (10) to its original position. The processed sheet blank (14) is removed from the device together with the deformable substrate (12). The device is ready for use again.

The essence of the proposed technical solution is as follows.

In the operation of this device, a deformable substrate is used, which provides at the stage of processing the rigidity of a sheet blank made of a composite material with a low-melting matrix, which itself has low rigidity.

Also, during operation, the deformable substrate ensures the positioning of the knife edge at the end of the working stroke below the lower surface of the workpiece by 0.1-0.5 mm, thereby allowing the knife not only to cut the groove contour along its entire length, but also ensuring the absence of scoring on the groove edges ...

In addition, in the claimed design of the device, due to the extraction mechanism, the piston of which displaces the stuck part of the sheet blank from the inner contour of the knife after each operating cycle of the device, the problem of obtaining the required shape with a clear outline of the edge grooves in sheet blanks made of composite material with a low-melting matrix prone to to sticking, with high performance.

Thus, the inventive device for cutting edge grooves allows cutting edge grooves with high quality edges in sheet blanks made of composite material with a low-melting matrix prone to sticking, preventing the material of the cut grooves from getting stuck in the inner contour of the knife.

Claims (2)

1. A device for cutting edge grooves in sheet blanks made of composite materials with a low-melting matrix, containing a base, a cutting unit installed above the working surface of the base and containing at least one vertically mounted knife made with a profile that coincides with the profile of the groove being formed, while the cutting edge of the knife is located above the working surface of the base, a toothed rack engaging with a toothed sector pivotally connected through a frame with a pressure lever, and the cutting unit contains an extraction mechanism located above each knife and containing a pusher with a spring connected to the piston, made in the shape of the inner contour of the knife and located in the inner contour of the knife with the provision of a clearance between the piston and the knife of 0.3-0.5 mm, and the pushers are interconnected by means of a pressure bracket. 2. A device for cutting edge grooves according to claim 1, in which a deformable substrate, made, for example, of cardboard, is located between the workpiece and the working surface of the base.

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