SU1685730A1 - Method for making holes in flexible materials - Google Patents

Abstract

The invention relates to methods of machining porous and cellular highly formed materials such as polyurethane foam and can be used to produce blind holes in articles of such materials. The aim of the invention is to obtain blind holes in articles made of elastic materials and to improve the quality of such holes. The preform 1 of highly deformable material is fixed on the base. Perforation 2, making a rotational and axial movement, cuts a hole of diameter D with depth H, forming an annular notch along the end face a. Then the notch is removed and, using figured plates, the workpiece is compressed until the waste formed in the form of a cylindrical column beyond the limits of the plates emerges after cutting out to the required depth of the hole N. In a compressed state, a piece of waste is produced with knives. After removing the compressive forces, the part elastically regains its shape and the cut surface is at the required depth of the hole N. The proposed method allows to obtain products with blind holes, grooves, etc. from soft, porous, highly deformable materials, does not require the use of complex tools. 1 hp ff, 4 ill.

Description

Phie.1

The invention relates to methods of machining elastic (porous and cellular highly deformable) materials such as polyurethane foam and can be used to make blind holes in articles of such materials.

The purpose of the invention is to obtain blind holes in articles made of elastic materials and to improve the quality of such holes.

FIG. 1 shows a diagram of the operation of cutting a hole of diameter D with depth H; in fig. 2 is a schematic of the operation of compressing a workpiece with a hole cut out; in fig. 3 is a diagram of the operation of segments of the resulting scrap cutting; in fig. 4 - part received,

The workpiece 1 of the highly deformable material is fixed on the base. The hollow tool (notch) 2, having made rotational and axial movements, cuts a hole of diameter D, depth H, forming an annular notch along the end face a (Fig. 1). Then the notch 2 is removed and with the help of a figured plate 3 with a hole with a diameter D and a figured plate 4 with a protrusion in, the diameter of which corresponds to the transverse dimensions coaxially with the hole, the workpiece is compressed until the waste formed in the form of a cylindrical column with a base at end a beyond the plates 3 to the desired depth of the hole H (Fig. 2).

In the compressed state, a piece of waste is produced by the knives 6 along the end face a (Fig. 3). After removing the compressive forces, the part elastically regains its shape and the cut surface is at the required depth of the hole K (Fig. 4).

By the proposed method, a blank hole with a diameter of 20 mm to a depth of 25 mm is made of polyurethane foam in a blank with a thickness of 80 mm. For this, a notch with a diameter of 20 mm is installed in the spindle of a vertical drilling machine. After cutting with a notch, the billet is compressed on a workbench until the base of the notched out cut out through the end of the billet ends up and the waste is cut off with a flat knife in a compressed state.

The proposed method allows to obtain products with blind holes, grooves, and the like. From soft porous, highly deformable materials, does not require the use of complex tools and provides high quality.

Claims (2)

1. A method of producing holes in elastic materials, including fixing the workpiece, inserting a hollow cutting tool into the workpiece to a predetermined depth and removing it from the workpiece to remove the formed waste, and in order to obtain blind holes, after removing embedded in the workpiece at a predetermined depth of the hollow cutting tool to the workpiece in the area of the resulting hole is applied to direction parallel to the direction of the slot formed inward from the surface of the workpiece, compressive forces until the base, formed by a slot of waste beyond the surface of the workpiece from in which the slits are formed, and in this state, the cut and removal of the waste formed is produced, and then the compressive forces are removed. 2. A method according to claim 1, characterized in that, in order to improve the quality of the holes obtained, compressive forces are applied to the workpiece using a tool in the form of two plates, the first of which is placed along the surface of the workpiece, from which side the slots are formed, and it has a hole whose transverse dimensions correspond to the transverse dimensions of the waste formed by the annular hollow tool, and 0 a second plate is placed on the bottom side of the deaf hole obtained and it is made with a protrusion whose transverse dimensions correspond to the transverse dimensions of the hole in the first plate, with 5, the hole in the first plate and the protrusion in the second plate are aligned with the longitudinal axis of the waste formed by the hollow cutting tool, and the outer surface of the plate with the hole serves 0 base for the tool carrying out the piece of waste.  five J 7 Zy /// A W ////// A b Ј FIG. t