Instrumental node to trim the bolt head

 

(57) Abstract:

Use: treatment of metals division, the manufacture of fasteners for cold-landing slots. The inventive node includes a housing and installed in it the work items. The Assembly is provided with the clamping bolt, the head of which is intended for interaction with the chamfer is made on the case. On the outer surface of the case is made unilateral axial slot and grooves with a depth of not less than 0.5 of the thickness of the casing wall, with the groove located radially relative to the body axis and equidistant angle 120oof said axial slots. 2 Il.

The invention relates to the processing of metals by pressure and can be used for the manufacture of fasteners for cold-landing machines.

A device for removing burrs on the bolt head, where cutting the bolt head exercise cut matrix having an internal cavity in the shape of a regular hexagon and an outer cylindrical surface. Square matrix is pressed into a solid body (see U.S. patent 4214333, NCI 10-20, IPC B 21 K 1/50).

In the famous cut matrix when the wear of one or more faces of prihodico and replace it with surgery, the repressing. Due to the low resistance one-piece cut matrix and high tradecost its replacement in the workplace at the machine decreases performance cold-landing of the machine.

A well-known tool for trimming the bolt head, which contains four or six work items trapezoidal shape of the working surface which is the outer or inner surface of the polyhedron. The front end of the outer surface of the die has a conical shape; the edge of the inner bore of the matrix is cutting edge. The matrix is set in the casing, the inner surface of which has the shape of a regular hexagon or square. On the inner side of the housing are made of the axial slots (Japan, accepted the application 58-48261, IPC B 21 K 1/50).

The disadvantage of this tool is the design complexity. Due to the fact that the internal hexagonal hole conical casing must be performed with high accuracy, the complexity of its manufacture is high.

This invention solves the problem of reducing the cost of manufacture of the tool, reducing the time of replacement of the tool in the workplace and improve the performance of kholodnoye node, namely, in the proposed design no intermediate casing. The case is made with unilateral axial slot and chamfer for the installation of the clamping bolt. To reduce the tightening torque of the bolt on the outer surface of the body has a longitudinal axial groove depth of not less than 0.5 of the thickness of the casing wall, equidistant angle 120ofrom unilateral axial slots. To reduce stress concentration grooves made along the radius. Inner landing surface of the housing is cylindrical. Work items cut matrix is in the form of segments, the inner surface of which is in the collection corresponds to a desired configuration of a head of planted bolt, and the outer surface is cylindrical.

The invention is illustrated in the drawing, where Fig 1 and 2 shows the design tool node.

Instrumental node includes a housing 1, the operating element 2, the clamping bolt 3.

When assembling the instrumental work items node 2 is inserted into the housing 1 through the clearance gap and closes the clamping bolt 3.

Ready node is placed in the mounting slot cold-landing of the machine. To replace a worn one or several is not required.

In the absence of construction of the intermediate ring (casing) reduces the cost of manufacture of the instrument node.

In connection with the reduction of the time for replacement of work items in the workplace improves the performance of cold-landing of the machine.

In connection with the reduction of wear of internal fit (working) surface of the shell increases its resistance and hence the multiplicity of its use.

Instrumental node to trim the bolt head, comprising a housing and installed in it the work items, wherein the tool Assembly is provided with the clamping bolt, the head of which is intended for interaction with the chamfer is made on the case, while on the outer surface of the last executed unilateral axial slot and grooves with a depth of not less than 0.5 of the thickness of the casing wall, with the groove located radially relative to the body axis and equidistant angle 120oof said axial slots.

 

Same patents:

The invention relates to the production of core products with head

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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