A method of manufacturing a tool

 

(57) Abstract:

Usage: in the field of processing of metals pressure during production of the shaped profile of the type of punches for punching of bolts and screws with a Phillips. The inventive of the original piece in the form of a cone by precipitation receive preliminary preparation with working part of the end section in the form of a truncated cone and it is associated with the cone angle component towards the axis of the workpiece is greater than the angle of inclination of the generatrix of the cone of the original piece. Then produce a formation face of the working surface of a tool body simultaneously with the punching protrusion of the tool in the form of the seal slot. 1 C.p. f-crystals, 4 Il.

The invention relates to the processing of metals by pressure and can be used in the manufacture of tool shaped profile of the type of punches for punching of bolts and screws with a Phillips screwdriver and calibers, having a cruciform cross-section.

A known method of manufacture of punches for punching of bolts and screws with a Phillips-including the manufacturer of the original piece, forming a cold extrusion cone with angle of 120owhen cobrasnake ledge, final machining punches [1].

The disadvantages of this method include mnogovershinnoe, the necessity of using heat and finishing operations.

The closest to the technical nature of the claimed is a method of manufacturing a tool shaped profile of the type of punches for punching of bolts and screws with a Phillips-including the manufacturer of the original piece, stamping pre-procurement with working part of the end section in the form of a cone and it is associated with a smaller base of the truncated cone of the conditions of uneven distribution of the deformation resistance at the height of the working part, the final formation of the end of the working surface of the casing and the pressing protrusion of the tool in the form of the imprint of the cross-shaped slot [2].

The disadvantages of the method include: formation of folds between the surface forming the end surface of the screw head (screws), and the housing prior workpieces, and excessive force pressing protrusion in the form of the imprint of the cross-shaped slot.

The formation of the working part of the preliminary ("hip") workpieces with uneven soprotivlenie [2] this is achieved by extruding "hip" procurement with angle generatrix of the truncated cone of the working part to the axis1from the original piece with the angle of the generatrix of the truncated cone of the working part of the0. When this0>1. In this arrangement, deformation only strengthened surface layers of deformable material, i.e., nonuniformity of the deformation resistance is only a superficial character and design quality cross-shaped protrusion may be made only if the modes listed in the known method. The method includes the deformation by extrusion with subsequent draft of the working part of hip" of the workpiece, by volume exceeding the volume of the imprint of the cross-shaped slot. The excess metal being pushed out, forming a crease between the previously formed end plane of a body and a face plane, formed from extruded excess metal. Manufacturer of punches for punching of bolts and screws with a shaped head in the shape of a hemisphere, a cylinder, a rounded cylinder or cone having a cross-shaped or combo slot, by a known method leads to the appearance of cracks on the end surface of the housing, which contributes to forming the crease.

The technical problem of the invention consists in the expansion of the product range produced by the instrument, improving the quality izgotavlivatsya is solved by when the production of the shaped profile of the type of punches for punching of bolts and screws with a Phillips nonuniformity of the deformation resistance at the height of the working part of the pre-procurement with angle forming the working part to the axis of the workpiece1receive a draft of the original piece with the corner forming the working part to the axis0where0<1. When this final stamping punches for the manufacture of screws and screws with Phillips having a head in the shape of a hemisphere, a cylinder, or a rounded cylinder, produced for the two transitions, making the second transition impression of the shape of the head.

The proposed scheme deformation (sludge) allows to obtain a preliminary workpiece with a non-uniform strain distribution along the height of the working part (the maximum the larger base of the truncated cone with the angle of the generatrix axis 1). In diametral cross-section due to volumetric hardening irregularity minimum. This scheme is more favorable, because the uneven distribution of the deformation resistance (strengthening) the height of the working part of the preliminary billet during extrusion of a cruciform protrusion allows the top more than the mind. A combination of precipitation (preliminary procurement) with reverse extrusion (when forming the cross-shaped protrusion allows you to get a good fill seal slot with minimal effort due to the baushinger's effect (alternating deformation). This reduces the volume of the deformable metal transitions and improve the conditions of the course (there are no conditions of extrusion of excess metal in narrowing the gap between the deforming tool and the previously formed surface of the edge of the workpiece. Due to a change in the scheme of deformation there is no likelihood of the appearance of creases.

In the manufacture of punches for stamping articles with heads in the shape of the sphere, cylinder, rounded cylinder or a rounded cone with a Phillips or combo slot, the final formation of the imprint head and the slot made for two transitions. On the second transition on a flat end surface of the case preform punch is formed finally shaped imprint the shape of the head with the imprint of the slot. No creases allows to form an impression of the shape of the head on the punch without breaking.

In Fig. 1 presents the original procurement. 1 . In Fig. 3 presents the final piece of the imprint of the cross-shaped slot. In Fig. 4 presents the final piece of the imprint of the cross-shaped slot and a semicircular head.

The method is carried out in the manufacture of punches for punching of bolts and screws with a semisecret, secret and cylindrical rounded heads according to GOST 11450-80. GOST 11651-80, DIN7981, etc. having a cruciform slot according to GOST 10753-86 etc. at the Magnitogorsk hardware-metallurgical plant in the conditions of a tool shop.

From round bar grinds the original workpiece with a working part in the form of a cone (Fig. 1) with the angle of the generatrix axis0approximately 18o. On the first pressing operation draft form the working part of the preliminary preform in the shape of a truncated cone with an angle of inclination of the generatrix axis126mated to a smaller base of the cone having an angle at the vertex 124o(Fig. 2). On the second pressing operation (Fig. 3) form the final imprint of the cross-shaped slot and the end surface of the housing of the plug, forming a flat end surface of the head of the product. Punches for making screws with a shaped head additionally clicks the ü heads product. In the manufacture of punches under the self-tapping screw DIN 7981 diameter 5.5 mm with slot N 3 the force of the extrusion slot 430 kN, which is 18% below the method comprising forming a cross with the formation of folds. During extrusion cavity in the shape of a hemisphere on the punch were no cracks are typical in the manufacture of similar punches traditional method.

1. A method of manufacturing a tool shaped profile of the type of punches for punching of bolts and screws with a Phillips-including the manufacturer of the original piece, stamping pre-procurement with working part of the end section in the form of a cone and it is associated with a smaller base of the truncated cone of the conditions of uneven distribution of the deformation resistance at the height of the working part, the final formation of the end of the working surface of the casing and the pressing protrusion of the tool in the form of the imprint of the cross-shaped slot, wherein the source receive the workpiece with the working parts in the form of a cone, stamping pre-harvesting produce a draft angle forming the working part to the axis of the workpiece, greater than the angle of inclination of the generatrix of the cone source procurement is estopa tool in the form of the imprint of the cross-shaped slot.

2. The method according to p. 1, wherein upon receipt of the punches for the manufacture of screws and screws with Phillips having a head in the shape of a hemisphere, a cylinder with a flat base or cylinder with a spherical base, forming the end of the working surface of the tool body and the pressing protrusion is produced for the two transitions, the second of which finally make out the imprint of the shape of the head and slot.

 

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