A method of manufacturing bolts

 

The invention relates to volumetric cold stamping and can be used in the manufacture of flange bolts with a multi-faceted head. Make the landing of the workpiece with the direction of the metal part on the formation of the spherical end of the ledge. You get a semi-finished product with a cylindrical head. The side surface of the specified heads give a multi-dimensional form by reduction with the direction of metal heads through open stream forming tool and the subsequent precipitation of the head with the multifaceted profile in a closed stream tool. Draught is produced simultaneously with the extrusion of the flange. The result is improving the quality of the items received and the reduction of the load on the forming tool. 4 C.p. f-crystals, 1 Il.

The invention relates to volumetric cold stamping manufacturer of flange bolts with a multi-faceted head, for example, in the form of a variable-alternating arcuate protrusions and depressions located on the side of the head.

A known method of manufacturing bolts with 12 point flange head, described in Japan patent 58-48259, the IPC 21 To 1/46, 1983.

The method consists in the original draft the kata, forming on the head of a multi-faceted profile by backward extrusion with the distribution of metal heads 6-edged punch, and finally forming on the cylinder flange with final podtekanie multifaceted profile.

The disadvantage of this method is the increased complexity and difficulty of manufacture. Squeezing multifaceted profile in a closed curly cavity requires a lot of effort deformation to overcome the efforts of the friction joint is nedooformlennym, reduced product quality and appearance.

A known method of manufacturing the flange bolts with a multifaceted curly head in the form of a variable-alternating arcuate protrusions and depressions on the lateral surface, type High, for example, described in U.S. patent 3584667, NCI 81-460, 1971, Fig.4, 5, 6, 7 (adopted for the prototype).

The method consists in the initial landing at one end of the workpiece has a cylindrical head with a conical chamfer on the end, in the subsequent extrusion of multi-faceted head prefabricated by the force of the back pressure of the plug in the closed stream with forming on its lateral surfaces of the six variable-alternating arcuate protrusions and depressions and the flange on the side of the rod.

Nedostrahovanija. The head of the semi-finished product becomes thin, the metal flows into the relief cavity at the same time it spreads and base, forming a flange. For metal embossed cavity slows down due to an ever increasing forces of resistance to the flow associated with the forces of friction, which depends on the coefficient of friction or the area of the contacting surfaces. To overcome the efforts of friction affect the quality of the coating and lubrication details, the cleanliness of the processing tool, and other parameters. When forming the curly head to overcome the high effort of friction requires high efforts deformation due to the different velocities of the points of the metal in a wavy profile. For metal wavy profile maximum stumble, contraction of the metal and turns rough side of the head, and in the presence of an air cushion in the stream - incomplete filling of the shape of the curvilinear profile of the head. The unevenness of the end face of the head in practice leads to the introduction repair machining - turning side of the head, especially on the head sizes less than E 12 (M 10). When forming the head by squeezing the height of the net profile "turnkey" is understated with minimal or incomplete filling of faces and Óle more than the particular scheme of deformation. In this scheme, the deformation process of the metal flow will occur as long as the resistance to flow of the metal will be less upsetting. After aligning the efforts of the forming faces and upsetting the metal begins to flow on the formation of the flange. For example, when reaching the coefficient of friction () to 0.06 (application of a phosphate coating at the surface of the tool 10 CL) is able to reach the height of this profile to 0.2 D, i.e. for the part with the head E 8 (M 6) practical height profile head beneath the key will be not more than 1.7 mm

The technical object of the present invention to provide qualitative details: full bolt head and a flat face, getting high-strength threaded connections by increasing the height of the polyhedron head, increasing the contact area of the projections and depressions on the head of the bolt with the corresponding elements of the production tool, which in turn, increases the torque screw pair.

Another objective is to reduce the load on the forming tool, the equitable distribution of it on the morphology of polyhedral profile and extrusion flange.

hogmannay head shaping of the material with cylindrical head carried by the landing of the workpiece with the direction of the metal part on the formation of the end face of the spherical protrusion, making the side surface of the cylindrical head multifaceted forms produced by reduction to the direction of metal heads through open stream forming tool and the subsequent precipitation received head with the multifaceted profile in a closed stream tool, which is carried out simultaneously with the extrusion of the flange.

In the process of landing the workpiece material with cylindrical head diameter within the tolerance on the minimum size of a "turnkey" head of the finished product.

Spherical protrusion on the end of cylindrical heads perform radius determined from the following mathematical expressionwhere R is the radius of the spherical protrusion of the cylindrical head of the semi-finished product, D is the diameter of the circumcircle of polyhedral bolt head, d - inscribed circle diameter of polyhedral bolt head,the chamfer angle on the end of the bolt head.

The reduction of the cylindrical head of the semi-finished product is carried out on part of its height corresponding to the height of the "turnkey" head of the finished product, stored on the cylinder head side rod bolt cylindrical belt, dostatochno head in the form of alternating projections and depressions.

The proposed method of manufacturing the flange bolts is significantly different from the prototype. Execution hanging head prefabricated spherical and reducing the head on the polyhedron through open stream forming tool free-flow metal allows you to balance the rate of metal flow, reduce in the center and to increase the circumference of the head, and consequently, to improve the quality of the machined surface of the head of the bolt, align it, to eliminate the laces, to achieve the maximum possible height of the projections and depressions on the side forming heads for larger mates with the head of production key.

The division of operations forming a polyhedral head and extrusion flange reduced load on the forming tool, increased durability, and ultimately the quality of the product.

The applicant and not known to the authors is similar to the methods of manufacturing the flange bolts with the heads of similar design, including the distinctive features of the proposed method of manufacturing bolts, which allows to consider the proposed method of manufacturing the flange bolts with a head in the form of a curved polyhedron with alternating alternating protrusions and pedestal inventive step.

The essence of the invention and its differences from the prototype illustrated in the drawing in the course of the process.

Refer to the drawing of the bottom - up.

The original workpiece 1, the position I is the semi - product containing a cylindrical head 2 with a spherical projection 3 from the side of the head and the rod 4 under the head, item II - a semi-finished product is a multi - faceted head 5 with a cylindrical belt 6 from the side of the rod 4, item III - a semi-finished product is a multi - faceted head 7 with the flange 8, the rod 4 with a chamfer 9, item IV - semi - planted multifaceted flange head 7, a rod with a reduced section 10 under the knurling thread, D is the diameter of the circumcircle (protrusions) of the multifaceted profile of the head 7 of the bolt, d - inscribed circle diameter (depressions), the multifaceted profile of the head 7 of the bolt, R is the radius of the sphere of projection 3,the chamfer angle on the end face of the head 7 of the bolt.

An example of performing the method Bolt flange mounting damper, item 560.1005066-01, M 1260 (Germany standard DIN 34800, December 1999) steel 38 HGNM, cold-landing machine, mod. WAA - 12FEET, rod-circle 11.7 mm Cut from the revolt of the workpiece 1 with a diameter of 11.7 mm and a length of 73.2 mm, by planting a form on it, the cylinder is key and shaft 4 under the head. The radius of the protrusion 3 is dependent on the chosen angle () facets multi-faceted head 7 of the bolt. The optimal chamfer angle is chosen within the=20-30o. At the next transition produces a reduction of the cylindrical head 2 on the multi-faceted profile on part of its height by a spherical protrusion 3 heads, directing the metal heads through open stream forming tool, the forming protrusions and depressions of the polyhedron free-flow metal. The total height of the resulting head 5-18 mm, diameter 12.59 mm Height (h1) polyhedron head 5 corresponds to the height (h) of the polyhedron turnkey head 7 of the finished bolt. On the head 5 from the side of the rod 4 is cylindrical belt 6, which is sufficient for subsequent extrusion of the flange. Third draft received head 5 with the multifaceted profile in a closed stream tool to produce the final design of the multi-faceted head 7 with a diameter of the circumcircle of the projections D=12.65 mm and the diameter of the inscribed circle of the depressions d=9.1 mm, Simultaneously squeeze the flange 8 with a diameter of 18.5 mm, the Total height of the head 7-12 mm, the height of the polyhedron "turnkey" h=4.2 mm at the same time form the chamfer 9 at the end crucial is the factory OJSC "Etna" made several pilot batches flange bolts with the head in the form of a curved polyhedron with arcuate projections and depressions on the proposed method, the tests, including in the conditions of the conveyor Assembly. The test showed high strength properties of products, high compatibility with staging tool, complaints about the quality and appearance no. It should be noted that in comparison with the prototype and with Germany standard DIN 34800, December 1999, the height of the resulting polyhedron the bolt head turnkey, for example, on the size M12 increased by 1.12 mm (3.23 up to 4.35 mm) minimum, or in the range from M3 to M12 height of the head increased by 1.3-1.7 times, and hence the area of contact between the key and the bolt head.

Obtained during tests positive result allows to conclude that "industrial applicability" of the proposed method of manufacturing the flange bolts with the heads multifaceted profile.

Claims

1. A method of manufacturing the flange bolts with a multi-faceted head, including the shaping of the material with cylindrical head, followed by making the side surface of the cylindrical head multifaceted forms and extrusion flange, characterized in that the shaping of the material with cylindrical head carried by the landing procurement is ti cylindrical head multifaceted forms produced by reduction to the direction of metal heads through open stream forming tool and the subsequent precipitation of the head with the multifaceted profile in a closed stream tool which is carried out simultaneously with the extrusion of the flange.

2. The method according to p. 1, characterized in that in the process of landing the workpiece material with cylindrical head diameter within the tolerance on the minimum size of a turnkey finished product.

3. The method according to any of paragraphs. 1 and 2, characterized in that the spherical protrusion on the end of cylindrical heads perform radius determined from the following mathematical expression:where R is the radius of the spherical protrusion of the cylindrical head;
D is the diameter of the circumcircle of the multifaceted profile of head;
d - inscribed circle diameter multi-faceted profile of head;
the chamfer angle on the end of the bolt head.

4. The method according to any of paragraphs.1-3, characterized in that the reduction of the cylindrical head of the semi-finished product is carried out on part of its height corresponding to the height of the "turnkey" head of the finished product, stored on the cylinder head side rod bolt cylindrical belt, sufficient for the subsequent extrusion of the flange.

5. The method according to any of paragraphs.1-4, characterized in that it is designed for the manufacture of flange bolts with multifaceted goals of the Sabbath.

 

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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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