The method of stamping heads of the bolts

 

(57) Abstract:

The invention relates to the processing of metals by pressure and can be used in the manufacture of bolts cold by forging. Produce a landing cylindrical head with an external bevel and cylindrical podgotovka. Cylindrical head planted diameter equal to 1.13 minimum size of the key, and a height equal to 0,75-0,85 final height of the bolt head. After landing the part of the head under reducing final configuration and dimensions to obtain the desired height of the bolt head. Then trim neuregulirovannaya cylindrical part of the head under the final size and configuration. The reduction of the head is performed in a punch or matrix. The result is the reduction of metal consumption and increasing the resistance of the trim tool. 2 C.p. f-crystals, 1 Il.

The invention relates to the processing of metals by pressure and can be used in the manufacture of bolts cold by forging.

The known method of forming a polyhedral bolt heads, including positions preliminary landing cylindrical heads restrict metal flow in radial napravlenii height of 0.8 - 0.9 height of the bolt head (SU, and.with. 1764757, CL 21 To 1/46, 1989).

The disadvantages of this method are low quality stamped bolts due to the formation of nodules on the face and the bearing surfaces of the heads. In addition, the method requires a complex tool design resistance which is due to the high perceived stress low.

Closest to the present invention is a method of stamping heads of the bolts, including the planting of a cylindrical head with an external bevel and cylindrical podgotovka and cutting a cylindrical head under the final configuration and dimensions (Cold forging. Reference edited by G. A. Navrotsky. - M.: Mashinostroenie, 1973, S. 265, PL.5, line 1).

This method provides good quality head bolts, but has the following disadvantages: firstly, when trimming cylindrical head a lot of metal goes to waste; secondly, due to high perceived stress strippers has a low resistance.

The invention solves the problem of the reduction of metal consumption and increasing the life of the trim tool.

To achieve the specified technical R is ohms and cutting a cylindrical head under the final configuration and dimensions, according to the invention, the cylindrical head planted diameter equal to 1.13 minimum size of the key, and a height equal to 0,75-0,85 final height of the bolt head, and after landing the part of it under reducing final configuration and size to receive the final height of the bolt head, then trim neuregulirovannaya cylindrical part of the head.

By introducing the operation of the partial reduction of the head significantly reduces the consumption of the metal, leaving the waste, and greatly increases the resistance of the trim tool.

The drawing shows a diagram of manufacturing bolts on operations on cold-formed multi-machine, where and - cut blanks, b - shaping the workpiece in the form of a truncated cone, in the landing of the cylindrical head, the combination of a cylindrical head, Dr. pruning of the remaining part of the cylindrical head.

The method is as follows.

Cut off the workpiece is served on the first molding position, where they perform preliminary conical set of heads. Then the workpiece is transferred to another position and make a landing cylindrical head screws with diameter D= 1,13 S min-0,85 final height of the bolt head N. The next position reduce part of the cylindrical head under the final configuration and size to receive the final height of the bolt head, and the reduction can be performed both in the punch upper part of the head, and in the matrix of the lower part of the head, adjacent to the stud bolt.

Next, the workpiece is served on the last position and carry out pruning the remaining part of the cylindrical head under the final configuration and size.

The proposed method is more economical and provides good quality head bolts.

1. The method of stamping heads of the bolts, including the planting of a cylindrical head with an external bevel and cylindrical podgotovka and cutting a cylindrical head under the final configuration and dimensions, characterized in that the cylindrical head planted diameter equal to 1.13 minimum size of the key, and a height equal to 0,75-0,85 final height of the bolt head, and after landing the part of it under reducing final configuration and dimensions to obtain the height of the bolt head, then trim neuregulirovannaya cylindrical part of the head.

2. The method according to p. 1, characterized in that reduzierte head is produced in the matrix.

 

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FIELD: metal working.

SUBSTANCE: hard alloy matrix has casing, bushing pressed in the case and hard alloy insertion. Bushing has multifaced hole. Hard alloy insertion is composed by several sections made in form of trapezoidal-section prisms which have cut angles at their non-working edges. Number of sections corresponds to number of faces of item to be headed. Cuts of angles are made symmetrically to faces of working edge. Slits are made in several places of multifaced hole bushing at the ponts where faces cross each other.

EFFECT: improved resistance of matrix; simplified assembly.

3 cl, 1 dwg

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