DE2036030A1 - Manufacture of flange members - Google Patents

Abstract

Non-cutting shaping method involves pressing flat square blanks of sheet metal coated with a layer of phosphate, on both sides. The blank is then subjected to further non-cutting shaping steps, e.g. drawing, reverse or forward extrusion pressing, to produce the article. Suitable for making nuts and bolts.

Description

Process for the production of flange parts by non-cutting shaping from square blanks The present invention relates to a method for Manufacture of flange parts by non-cutting shaping.

The invention takes the production from flat square blanks and has the purpose of making these parts from round bars and wires resulting from the degree of deforaation by using flat square To reduce blanks and further the utilization of phosphate sheet to reduce friction to enable non-cutting forming.

So far, there are essential processes for making these zbrikets known.

In the first process, these makes are based on Umformungsautoraten produced for the preparation of nuts and bolts, the starting material being a Round bar or wire is. The sections have a metallic on the end face bare surface, the higher the degree of deformation and the formation of openings Causes trouble because there is too much friction0 in the case of the second Process, these products are produced on conventional mechanical presses who are familiar with the use of reverse extrusion from square blanks ist0 B. In this process, a full pressure stamp is used, which means that the deformation pressures are high, which in turn shortens the life of the tools The present invention avoids these disadvantages Invention is that for the production of flange parts flat square Sheet metal blanks are used, both sides of which are covered with a phosphate layer are provided that the blank is pressed in the edge part of a pair of tools be, of which at least one tool in the middle part is relieved and that one in further operations with the usual non-cutting forming, e.g. drawing, reverse extrusion or forward flow presses the workpiece produced further.

The essence of the present invention as well as other advantages are as follows based on shown schematically in the drawing Embodiments Explained in more detail0 The figures show: FIG. 1 a diagrammatic view of a flat one Material from which square blanks before the start of the first work process are made, Figure 2 is a schematic longitudinal section through a die and an inserted square blank, as well as the outline of a stamp Beginning of the first work process, figure; a schematic longitudinal section like in FIG. 22, however, after the completion of the first working process, FIG. 4 is a schematic Longitudinal cut as in Figures 2 and 3, but when performing the second work process, Figure 5 is a Schesztischen longitudinal section through a finished product and the punched out Bottom, Figure 6 is a schematic longitudinal section through a product from another Form when using a perforated Xatrise and a hollow pressure stamp during of the first work process.

The products are basically made of flat material 1, which is phosphatised on both sides of the surface. Made from material 1 e.g. square blanks 2 are produced, which with their flat side in one with a central bore 4 and a pressing chamber 5 provided Die 3 are inserted. A punch 6 acts on the square blank 2, which is advantageously provided with an example of a spherical bulge 7, when The first work process, during which a pre-pressed part 2a is formed, occurs for upsetting a cutting edge 21 in the pressing roughness 5, while a middle part 2 ″ of the square beech blank 2 only bends and into the central hole 4 of the die 3 displaced (Figure 3) further die 8, which also has a central bore 9 and a pressing chamber lo (Figure 4) is provided, from the pre-pressed part 2a due to the action of an extrusion mandrel 11 against a stationary ejector 12 by backward extrusion a finished product 2b in the form of a shell with a flange, from which optionally in another Operation a bottom 13 is punched out (Figure 5).

Another embodiment works in one with a central bore 15 provided die 14 a hollow pressure stamp 17 on a dashed line in FIG square blank 16 shown in such a way that after it has been pressed out forms a semi-finished product 18 with central bulges 19 on both sides, which can be used for another work operation.

The invention made it possible to use square pieces of sheet metal the desired product using a relatively low pressure while taking full advantage of the phosphated sides of the blank are used, which cause a reduction in friction. For this reason, far lower degrees of deformation are required to obtain the finished product necessary, which in turn leads to lower forming pressures than previously well-known procedures are necessary.

These two reasons are the cause of a decrease in both the forming pressures as well as tool wear, which results in higher work rates can.

Claims (1)

P a t e n t a n s p r ü c h Process for the production of flange parts by non-cutting forming, characterized in that flat square blanks are made on both sides sheet metal provided with a phosphate layer in the edge part of a pair of tools are pressed, of which at least one tool ii middle part is relieved and that in further operations with the usual non-cutting forming, e.g. drawing, Backward extrusion or forward extrusion completes the product. L e r s e i t e