A method of manufacturing parts having a multi-faceted cross-section

 

(57) Abstract:

The invention relates to cold production, in particular to the manufacture of fasteners with the multifaceted profile. A method of manufacturing parts having a multi-faceted cross-section, includes the planting of semi-finished of circular cross section and shape of the polyhedron reduction. While the semi-finished of circular cross section are planted with a conical protrusion on the end. The morphology of the polyhedron carry out the reduction of the height-preserving belt of circular cross section at the base of the polyhedron and a draft of the latter in a closed stream. The result is improved product quality and durability of shaping tools. 3 C.p. f-crystals, 1 Il.

The invention relates to volumetric cold stamping and can be used in the manufacture of fasteners with a multi-faceted cross-section, such as bolt heads, nuts.

There is a method of manufacture of parts with multi-faceted cross-section, for example, bolts and nuts, are described in and.with. THE USSR 373076, THE IPC 21 TO 1/00, 1973.

The method consists in the section of the workpiece, the landing of semi-finished of circular cross section, the reduction of prefabricated polygonal cross-section, after upsetting is not more than the diameter of the circumcircle of the polyhedron.

The disadvantage of this method is the low quality of the articles produced due to incomplete clearance of the edges of the hexagon and the displacement of the metal is reduced, the head on its end surface. Appear flows, the burrs. For alignment of the end face on the last transition of these flows sastymowimats with the formation of layers and sunsets. In addition, the disadvantage of this method is the low resistance reducing matrix.

A known method of manufacturing a multi-faceted bolts with a dead washer described in and.with. The USSR 878406, the IPC 21 To 1/46, 1981, consisting in a preliminary reduction of the cylindrical workpiece on its entire length with forming on its lateral surface of the semi-circular slots on the number of faces, with the extrusion of a round rod, the subsequent upsetting of the head of the semi-finished product, giving her side of the rounded shape of the polyhedron size turnkey greater than the corresponding dimension of the polyhedron products, reducing rounded hexagon on the size of the key, the edit chamfer and end surface with the formation of dead washers.

The disadvantage of this method is that known solution does not exclude posleduushie an edit operation chamfer does not exclude the possibility of additional precipitation of the head to the size of the key, greater than the corresponding size of the head of the finished product. The disadvantage is the low resistance of the tool on the positions of the slotted extrusion profile head semi-finished and precipitation her with getting rounded polyhedron, procurement of enlarged diameter is shaped cavity and reduced the entire length with subsequent extrusion of a round rod, leaving a portion of the splined section on the education of the head of the bolt. A large amount of a reducible material along the length of the workpiece through the curly matrix leads to excessively large efforts friction opposing the effort reduction and direct extrusion. Metal flow in the matrix slows to a crawl, because it proceeds on its peaks and troughs, and the speed of the current in them is not uniform. The load on the tool increases, it is the sum of the total force on the extrusion of a cylindrical rod and to overcome friction efforts and forming slotted head (a combination of reduction and extrusion), specific voltage to reachc= 2000 MPa. The method described in A. with. The USSR 373076, the IPC 21 To 1/00, 1981 adopted for the prototype.

The technical object of the present invention is povysheno in the method of manufacturing of parts, having a multi-faceted cross-section, including the planting of semi-finished of circular cross section and forming it of a polyhedron reduction, semi-finished, of circular cross planted the tapered protrusion side face and forming a polyhedron perform a preliminary reduction of the above intermediate product from the side of the conical protrusion on the part of the height of the material with the retaining belt of circular cross section at the base of the polyhedron and draft multi-faceted semi-finished product in a closed stream.

Semi-finished, of circular cross planted in diameter, which is determined from the relation

< / BR>
where D1- the diameter of the semi-finished of circular cross section,

S is the size of the polyhedron finished parts,

- the ratio of the relative degree of deformation of the cylindrical semi-finished of circular cross section, where a = 0.4 to 0.7.

The tapered protrusion on the semi-finished of circular cross section shape with diameter end of the range determined from the relation

< / BR>
where d1- diameter end of the round cone hanging semi-finished of circular cross section, dzagthe workpiece diameter, the ratio of the relative degree of deformation of the cylindrical semi-finished of circular cross section, and with the angle cues perform height

h = 0.05-0.25 d,

where h is the height of the persistent band of circular cross section on the semi-finished product,

d is the diameter of the thread of the finished product.

The proposed method for the manufacture of parts with multi-faceted cross-section, is a significant difference from the prototype, leading to improvement of quality of manufactured parts and reduces the load on the forming tool.

The applicant and not known to the authors similar ways of making fasteners with a multi-faceted cross-section, including the distinctive features of the proposed method for the manufacture of parts having a multi-faceted cross-section, which makes the proposed method applicable criteria of "novelty" and "significant differences", i.e. the proposed solution meets inventive step.

The essence of the invention and its differences from the prototype are illustrated by drawing on the example of the manufacture of hex bolt and dead puck along the transitions of the process.

Notes on the drawing.

The workpiece 1, the position of the I - prefabricated, barrel-shaped head 2, the rod 3 under the head 2, item II - prefabricated planted cylindrical head 4 with the tapered protrusion 5 on the and from the side of the rod 3, position IY - ready bolt under the knurling thread, hexagon head 8, with a dead washer 9, the rod 3, with the chamfer 10, D1- the diameter of the cylindrical head of the semi-finished product, d1- diameter end of the round cone hanging head prefabricated, S is the size of the hexagon turnkey the bolt head.

An example of performing the method.

The hex bolt and dead washer, item 4593181315, M10-6g 25, material steel GR, rod - circle 10.15 mm, automatic cold-landing VA-F. Cut off from the revolt of the workpiece 1, the length of 38.4 mm, rebuff forming on her barrel-shaped head 2, with a diameter of 10.2 mm and a length of 19.7 mm and the rod 3, the diameter of 8.75 mm At the next transition planted cylindrical head 4 with a diameter of D1=14.5 mm and a height of 11.2 mm with conical protrusion 5 diameter end of the range of d1=6.5 mm and a cone 90o. Further, the cylindrical head 4 reducing on the part of its height on the hexagon 6, from the side of the cone 5. The total height of the head 12.2 mm, the diameter of the circumcircle 14.6 mm, size S=12.5 mm. On the last position, the force of precipitation in a closed stream matrix, form a hexagonal head 8, acting on the tapered end of the lug 5 head 6, is formed into lead-in chamfer 10 under the thread. Height ASS="ptx2">

Currently, the plant OJSC "Etna", made several pilot batches of bolts using the proposed method, tested, which confirmed the high quality of the products and their appearance, high strength threaded connections using bolts manufactured according to the proposed method. Obtained during tests positive result allows to conclude that "industrial applicability" of the proposed method of manufacture of parts having a multi-faceted cross-section.

1. A method of manufacturing parts having a multi-faceted cross-section, including the planting of semi-finished of circular cross section and forming it of a polyhedron, reducing, characterized in that the semi-finished of circular cross section are planted with a conical projection from the side end face and forming a polyhedron carry out the reduction of the above intermediate product of the height from the side of the conical protrusion with preservation of the belt of circular cross section at the base of the polyhedron and draft multi-faceted semi-finished product in a closed stream.

2. The method according to p. 1, characterized in that the semi-finished of circular cross planted in diameter, determined from sootnosheniyami;

- the ratio of the relative degree of deformation of the semifinished product, where a = 0.4 to 0.7.

3. The method according to any of paragraphs. 1 and 2, characterized in that the tapered protrusion on the semi-finished of circular cross section shape with diameter end of the range determined from the relation

< / BR>
where d1- diameter end of the round cone hanging semi-finished of circular cross section;

dzagthe diameter of the workpiece;

- the ratio of the relative degree of deformation of the semi-finished of circular cross section and the cone angle in the range = 70-100o.

4. The method according to any of paragraphs. 1-3, characterized in that the belt of circular cross section at the base of the polyhedron is reduced, perform height h = 0,05-0,25 d, where h is the height of the persistent band of circular cross section in the material; d is the diameter of the thread of the finished product.

 

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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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