CS248244B1 - The method of making the holes with a continuous through-hole - Google Patents

Abstract

The method solves the production of shapes with a continuous opening of any cross-section by overdrawing. The essence of the method lies in the fact that at least two blanks are simultaneously overdrawn in one direction one after the other and the completely overdrawn blank is separated from the blank that is still being overdrawn.

Description

248244

The present invention solves the process of producing the openings by extrusion through the extrusion, in particular difficult-to-mold materials, in which the main stop is dimensioned and dimensionally accurate and characterized by an extremely large or small slenderness ratio.

Up to now, artifacts with continuous forming apertures have been produced in smaller series-classical cutting operations, casting, and molding in larger series. From the individual molding processes, the technology of manufacturing hollow parts by rolling and pulling from billet, forging and extrusion is considered. From sp & re, we can extrude to forward, wrong, and combine. In addition to being suitable for use in certain areas, each of the above-mentioned methods has a number of disadvantages which ultimately are narrowly limited by the technological parameters resulting from only the shape and dimensional accuracy of the component as well as the material deformability itself.

Molding of parts with continuous opening and rolling is applied in metallurgical production, where in the majority of semi-finished products and not finished parts, mainly with regard to limit possibilities of tolerances and total accuracy.

Another important factor limiting the use of these methods, in the case of accepting high demands on dimensional and impression accuracy, is the issue of ductility in the cold. At low values, formability, if the material is not guaranteed to be chemically formed, there are cracks and depletion of the capacity of the material at low values of formation, which virtually either precludes the use of these molding processes or requires additional equipment. operations like jenapr. Interoperative annealing. The chickens are also the fact that the devices themselves are robust, occupy large areas and all their character is primarily used for specialized bulk production.

There are also some limitations in the manufacture of components with continuous extrusion openings in terms of material and material dimensions. These are mainly manifested in materials with lower formability, which either cannot be formed at all or require additional heat treatment operations, thereby increasing the energetic expense of production.

The most serious drawback of the prior art extrusion die production methods is that the semi-product forming, calibrating semi-finished, and finished art releasing operations are carried out separately from the tool, changing the sense of power of the fringe. The consequence is that in the final phase of the forming process - the scraping of the art, the sticking of the material of the art throat and ultimately the destruction of the tool.

These drawbacks are eliminated by the method of making the openings with a through-hole through the extrusion of the die-shaped blank with the reduction of the outer and inner dimensions at the same time or individually by the caliper and embedded therein by at least two blanks being pushed in one direction at a time and the fully embossed blank is separated from the still-extruded blank. An advantage of the method according to the invention is that any process for the production of continuous-hole formations is carried out in such a way that at each working stroke at least one-piece artist is produced and separated from the still-extruded after-product in the molding force and after the at least one blank is fully compressed. a subsequent semi-finished semi-finished product remains in a press-fit and heats-on, which allows for the insertion and alignment of the next tube-shaped semi-finished product.

The production method of the invention is simple and can be made by art with a through hole of any cross-section of material-free failure. Made with high geometrical and shape precision.

BRIEF DESCRIPTION OF THE DRAWINGS In the accompanying drawings, there is shown a method of manufacturing a die with a continuous mold of the invention, wherein FIG. 1 shows the initial and FIG.

The tube-shaped blank 1, threaded through the coating 2, is partially overprinted by the through-flow 6 and remains in the overpressure 3 after overprinting.

The next blank 12 is threaded onto the pin 2 of the blank with the already partially embossed blank 1 being extruded by the through-flow 6, while the external and internal dimensions of the blank 1, 2 are calibrated and the already embossed blank 1 is wiped from the strand 2 in the feed direction. the formation of frictional forces does not change during the entire process until the end of the process, and after the semi-weld 1 is completely overprinted, it is separated from the still extruded material 12 which remains in the passage 3 after partial overpressure. the tube-like shape of the yoke is repeated.

In this way, it is possible to produce moldings with a through-hole of any type.

Claims (1)

248244 SUBJECT OF SPOSSIB to produce continuous-extruded die sections by extruding a tube-shaped blank with the reduction of both the outer and inner dimensions of the pipe simultaneously with the at least one pressurized and embedded invention, characterized in that at least two the blanks by one direction for self and the full overprinted semi-product is separated from the still extruded brewery. 1 sheet of drawings