DE1020221B - Process for the production of nuts from sections sheared off from a round bar by deformation - Google Patents

Description

GERMAN

The invention relates to a method for producing. Nuts sheared off from a round bar Sections, which after a subsequent leveling and straightening process in the further work flow on both sides be pre-punched, and here receive their finished polygonal profile in the press die, whereupon there, s perforation takes place, a solidification of the material being achieved by the deformation target.

Such processes have become known several times. So one has already been proposed first compress the cylindrical rod section to a lens shape with free expansion. Then. will that Compressed rod section with pre-punching on both sides pressed into a mold cavity to form a hexagon and pierced this.

This process is limited to four steps, which are carried out when the material is cold. Included it is necessary, if sharp shapes without cracking are to be achieved, a selected and to use expensive material.

According to another proposal, the cylindrical rod section is in a die cavity leveled and straightened, then deeply pre-punched without pressure on the face, with the material in the surrounding Hexagonal shape is displaced; then takes place with the compact being enclosed on all sides a deep hole from the opposite side, in which the hexagon is further completed, and finally that Perforating the enclosed workpiece. Also this procedure puts well sculpted and selected Material ahead.

In another method, which is more recent compared to these proposals, the rod section is initially leveled and straightened. This directed and at most already somewhat pre-compressed compact, the If a bevel is obtained in the process, it becomes either cylindrical or incomplete in a further work step hexagonal preform further compressed. This preform is made with a double-sided pre-piercing formed into a complete hexagon, possibly with turning and switching on further pressing steps to create special face profiles; the hexagonal workpiece is then punched through.

After, another; Procedure is assumed to use unselected, cheap material. For this, however, it is preferred to hexagon shape Profiles run out. The hexagonal rod sections are z. B. leveled and straightened, then Pre-punched on both sides and the hexagonal shape is finally pressed. This is followed by piercing.

The object of the invention is now to use cheap material to produce the final shape with a leveling and straightening process, a pre-hole process for the production of nuts

sheared off from a round rod

Sections by deforming

Applicant:
Loos & Schmidt, Plettenberg

Wilhelm Loos, Plettenberg,

and Willi Meier ,, Plettenberg,

have been named as inventors

gang to get along by completing the hexagonal outer shape and a perforation process.

However, while the aforementioned method is based on a pre-profiled, semi-finished product which can be subjected to annealing after the leveling and straightening process., should be more common We assumed a cylindrical semi-finished product and the rod section here in itself known leveling and straightening are subjected, which includes a certain pre-upsetting with.

The solution to the problem is that the cold sheared, then leveled, and straightened pieces preheated to 600 to 800 ° C and pre-punched and finished profiled in the following work step.

While, even with selected. Material, in, as a rule, the transition from the rod section to the cold pre-punched, precisely pressed, hexagonal workpiece comprises three work processes, is through, the transition to the Warm deforming after the leveling and straightening according to the invention saves a spreading process. Included is the pre-compression in. Leveling and straightening process reasonably low and the upsetting work, as at all the essential work of deformation that strains the material and could lead to cracking in the Warm deformation area relocated.

A proposal has already been made according to which the shearing and the subsequent one Shaping takes place at warm temperatures. Opposite this proposal points however the present method has the advantage that by the cold shearing of the blank is less crushed and the planing, and straightening, is facilitated while at the known. Warm process such bruises besides. On the one hand, ridges are untrained Edges on the other side could cause.

709 807 / Ί49

Furthermore, when preheating the individual pieces, better heating, especially for a quick operation, achieved; than preheating the bar, which leads to an uneven processing temperature lead, or in the case of local heating an expensive, z. Legs Induction device required.

Another advantage of pianing and straightening the workpieces before intermediate heating is therein, that the conveyance and supply of the workpieces extremely safe due to the even shape achieved by leveling.

In the drawing, the method according to the schematic is shown, for example. It Fig. 1 and 2 show the cold deformation of the material, Fig. 3 and 4 the warm deformation.

According to Fig. 1, a rod α of round cross-section is inserted up to a stop b in a shearing device and a piece e of the rod α is cut off by the knife d sliding past the shear sleeve c . This piece e is according to Fig. 2 in a device between two punches f, g leveled and pressed into a round h . The Ron.de h is heated to a processing temperature of about 600 to 800 ° C. in a continuous furnace (not shown) and fed to a press shown in FIGS. 3 and 4. According to Fig. 3, the round blank is

finding

punch k formed into a nut η in a die m and pre-punched by the punch 0, p . The cleaning r is ejected from the nut η by the punch J as shown in Fig. 4.

Claims (1)

Claim _: Method for producing nuts from a round bar; sheared off sections, which after a subsequent leveling and straightening process in the further work flow prepunched on both sides will and. get their finished polygonal profile in the press die, whereupon the perforation takes place, characterized in that the cold sheared, then leveled and straightened Pieces preheated to 600 to 800 ° C and pre-punched and finished profiled in the following work step will. Considered publications: German patent application L 2006 Ib / 49i; British Patent Nos. 396 110, 557 731; French Patent Nos. 925 569, 927 077; Swiss Patent No. 220 540; U.S. Patent No. 2,062,640; "Werkstattstechnik und Maschinenbau" magazine, 40th year (1950), issue 6, pp. 217/218; Wire magazine, 3rd volume, March 1952, No. 3, p. 85. 1 sheet of drawings © 709 807/143 11.