How to crop heads, core products

 

(57) Abstract:

The inventive method of trimming heads bar products produced by cutting into the head of the trim tool, the bearing support surface of the head to the bearing surface of the matrix. Plunge into the cylinder to produce the whole of its height. 1 C.p. f-crystals, 1 Il.

The invention relates to the production of core products with the head.

There is a method of trimming heads of core products used in the manufacture of hex bolts with end chamfer on the rod, including cutting-edging tool end surface of the head opposite to the rod side attachment to the end portion of the rod effort equals the effort of cutting/1/. At the end portion of the rod is formed chamfer. After maskoobraznoe force incision is closed on the contact bearing surfaces of the bolt head and the matrix, after the operation of cutting into the crown of her dartania mentioned cutoff tool attachment to the end portion of the rod axial forces pushing and doreski.

The disadvantage of this method great effort of trimming heads, due to the large contact surface of the head with a matrix of immaterial head to its periphery.

The technical result achieved by the invention reduction efforts trimming heads of core products.

This is ensured by the fact that in the method of trimming heads of core products, including cutting-edging tool end surface of the head opposite to the rod side attachment to the end portion of the rod effort equal to the force of cutting, incision in the head produce excluding support its bearing surface on the bearing surface of the matrix.

Due to the absence of contact of the bearing surfaces of the head core product matrix plunge cutting tool into the head accompanied by significantly less effort due to the lack of friction forces on said bearing surfaces.

To improve the tool life of the cutting operation /trim punch and ejector/ cutting-edging tool to the head produce the entire height of the head. In this case, strippers feels much smaller dynamic load due to the absence of operations dartania heads, carried out by the stroke of the ejector at the end of the rod with transmission of shock loads on strippers.

The drawing is ment 1 bolted in the workpiece 2 is accompanied by the expulsion of its rod with the forming of the end bevel moreover, the size of the chamfer is determined by the force of cutting.

The contact bearing surface of the head with the orientation matrix 3 has no place in the operation of cutting.

Cutting-edging tool 1 is performed on the entire height of the head with a branch of the fin 4; therefore, the operation dartania in the method prototype in the proposed method is missing. After the operation of cutting into the head of it in the proposed method is the trim head - application of axial force to the end of the rod is the removal of the workpiece 2 die 3 blow ejector 5, which is not accompanied by the cutting of the head material.

1. How to crop heads of core products, including cutting-edging tool end surface of the head opposite to the rod side attachment to the end portion of the rod effort equal to the force of cutting, characterized in that the incision in the head produce, excluding support its bearing surface on the bearing surface of the matrix.

2. The method according to p. 1, characterized in that the incision in the cylinder to produce the whole of its height.

 

Same patents:

FIELD: plastic working of metals, possibly manufacture of rod like fastening articles with heads having curvilinear supporting surface, such as clamp bolts for joining rails of railway road.

SUBSTANCE: cutting off operation is realized by means of tool having die, punch and knocking out member. Rod portion of blank of rod article is placed in hole of die having recess. At initial stage of cutting off operation by action of punch upon end face of head the last is embedded into cut-off die. Then simultaneously punch and cutting edges of die are cut into body of head at clamping cut-off metal between end surfaces of punch and die. Said cut-off metal is separated from head by pushing rod article through opening of punch. Cutting edges of die are cut into bode of head by depth consisting of 0.65 - 0.80 of height of article head while preventing contact of faces of head part placed between cutting edges of die with die surface. Distance between cutting edges of die providing cutting-off of mutually opposite faces of head consists of 0.95 - 0.99 of similar distance between cutting edges of punch. Height of die recess consists of 0.65 - 0.80 of head height.

EFFECT: improved quality of articles, enhanced strength of tool.

2 cl, 4 dwg

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