Method for manufacture of hollow forged piece with offset

FIELD: technological processes.

SUBSTANCE: upset is done in initial stock end to mold stock with convex ends. Then upset stock is turned, laid flatwise, and semi-finished product is molded with cavity and link. Molding is done preferably in one half of die by expansion and metal extrusion upwards and to offset side that is unsymmetrical relative to vertical axis of semi-finished product cavity. At that upper end surfaces of semi-finished product are left free from contact with tool. Then final stamping of semi-finished product is done in open die with displacement of external burr, removal of link and burr.

EFFECT: higher efficiency.

11 cl, 2 dwg, 1 ex

 

The invention relates to the processing of metals by pressure and can be used in the manufacture of molded hollow forgings with a side process, such as tips for rods Centerpoint suspension trucks and tie-rod ends. Manufacturing of forging is carried out in a temperature corresponding to the warm and hot bulk forming.

A known method of manufacturing a hollow forgings with the process, including the planting head part two of typesetting transition, the formation of the head part in the form of spheres, the final forging open die, trimming Burr and firmware bridge (die forging. Atlas diagrams and typical designs stamps: Uch. A manual for engineering universities / Washenko, Vbb, Upoli. - 2nd ed., revised and enlarged extra - M.: Mashinostroenie, 1982. - 104 C., Il. p.75, RIS).

The disadvantage of this method is the necessity of using a large number of transitions and complex design of the stamps.

A known method of manufacturing forging tips, including draught flatwise of the original piece, designed to take two forging, forming a semi-finished product in the outdoor stamp with the displacement of the metal in the scrap, the final forging open die, punching holes and cutting scrap (Sementi VI, Acaro I.L., Volosov NN advanced technology, equipment and automation of forging and stamping production of KAMAZ. - M.: Mashinostroenie, 1989. - 304 with silt. p.148-160, RES, 77).

The disadvantage of this method is the large metal consumption, high energy consumption of the process and low tool life due to high investments and intensive expiration large amount of metal in the scrap. The force deformation of two forgings higher than the force deformation of one of the same forging more than 2 times. It is necessary to deform necessary in such cases, technological jumper connecting forgings. It is necessary to use substantially more power. For example, the force of the deformation of one forgings (by known techniques) 8 MN. You can use press nominal force of 10 MN. The force of deformation of the two forgings, while stamping 18 MH. The next in the series press 16 MN cannot be applied. You should use press 25 MN, which is much more expensive.

Tasked to develop an economical method of manufacture of hollow forgings with a horizontal ridge, the way to get forgings with less metal and less effort and strain.

The technical result in the method of manufacturing a hollow forgings with a horizontal process that includes heating the original piece, draught, laying flat, forming a semi-finished product is with pocket and strap, final forging open die preemptive external overflow, remove the jumper and Burr, is achieved by the fact that in the process of precipitation in the end form the workpiece with convex ends, then upset preparation turn and form a semi-finished product, mostly in one half of the stamp, distribution and asymmetric, relative to the vertical axis of the cavity of the extruded metal up and to the side of the ridge, with the upper end surface left free from contact with the instrument.

Draft procurement exercise to the height, the greater the diameter of the upset billet.

Draft procurement exercise to shape inserts, the surfaces of which correspond to a part of the side surface of the lower stamp of the semi-finished product.

Draft procurement exercise on the inserts, at least one of which has a spherical surface.

Form a semi-finished product with dimensions in plan, not to exceed the corresponding dimensions on the plan are permanently stamped forgings.

Form a semi-finished product with a jumper, symmetrical relative to the vertical axis of the cavity.

Form a semi-finished product with a bridge of variable thickness.

The thickness of the jumper increase in the direction of the ridge.

Form a semi-finished product with a jumper at the final thickness.

Prefabricated form in two transitions.

The formation of the upset billet with convex ends allows after her turning and laying flat in the bottom stamp of the second transition position the metal part in the region of the Appendix (see figure 1, path transplanted procurement). Thus, for the formation of bone by extruding the metal will require less effort and energy. In this case, the moving metal parts in the area of process is carried out by profiling the workpiece slightly loaded on operations "Sludge", its rotation and styling.

The formation of semi-finished predominantly in one half of the stamp without overflow allows for deformation-free from contact with the tool surface. In addition, the semi-finished product is obtained without movement of the outer lateral surfaces, which is beneficial to the base in the stamp of the next transition.

The formation of the semi-finished product distribution (registration hollow part of the semi-finished product) and asymmetric, relative to the vertical axis of the cavity of the extruded metal up (increase in tall sizes product) and process (metal redistribution for registration process allows you to prepare the material for deformation in the final stamp so that deformation in the final stream passed largely due to the separation, and not vidalis the deposits. In this case reduces the required (fill stamp) afflux of metal from scrap and therefore saves both metal and energy for carrying out plastic deformation.

The formation of the semi-finished product free from contact with the tool face surfaces can significantly reduce the effort of punching.

Forged from the bone, at least about one axis symmetrical. Therefore, during stamping operations redistributed metal. For most forging is advisable to conduct a draft to the height, the greater the diameter of the upset billet. In this case, after it is rotated 90 degrees and placing the stamp of the next transition a greater amount of metal will be located in the field of bone.

The under surfaces of the shaped inserts the portion of the side surface of the lower stamp of a semifinished product can reliably base is mounted the workpiece.

Many hollow forgings with the process are symmetric about the vertical axis of the cavity. In this case, the sediment on the inserts, at least one of which has a spherical surface corresponding to the portion of the side surface of the lower stamp of a semifinished product, provides high-precision positioning.

The formation of the material with dimensions in the plan, not to exceed the corresponding dimensions in terms of ocongate is Ino stamped forgings, provides reliable hosting semi final stream that contributes to the reduction of metal consumption.

Depending on the specific sizes of forgings possible different ways of forming the lintel of the semi-finished product.

Tool for forming of semi-finished product with symmetric jumper is the simplest to manufacture.

Prefabricated symmetric jumper final thickness allows for final stamping of the surface of the jumper is left loose. In this scenario, you receive the opportunity to displace the excess metal in the direction of the bridge. This reduces the force deformation and provides a stable implementation of the method of forming in a production environment.

When forming the jumper variable thickness, it becomes possible to increase the displacement of the metal under the punch in a given direction. For example, increasing the thickness of the jumpers in the direction of the process, a shift in the direction of the process, the proportion of the metal will increase in comparison with the jumper of equal thickness.

When complex forgings with the developed process and(or) complex configuration of the head part of the prefabricated form in two transitions.

Comparative analysis of the proposed technical solution with the prototype shows that the inventive method of manufacturing forgings differs from PR is the totype.

In the method prototype draft of the original piece for two forgings spend flatly.

In the proposed method, the draught of the original piece for one forging is carried out in the end.

In the method prototype is mounted the workpiece does not rotate.

In the proposed method, upset preparation turn.

In the method prototype prefabricated form draught and squeezing.

In the proposed method, the semi-finished product form distribution and asymmetric, relative to the vertical axis of the cavity of the extruded metal up and to the side of the ridge.

In the method prototype prefabricated form in the stamp with the displacement of the overflow.

In the proposed method, the semi-finished product is formed in the stamp without the formation of a Burr.

In the method prototype prefabricated form without the presence of free surfaces.

In the proposed method, form a semi-finished product and the upper end surface left free from contact with the instrument.

These distinctive features provide the possibility of obtaining from blanks of standard accuracy high-quality forgings with minimal metal. This approach implements a high tool life.

Thus, this solution meets the criterion of "novelty".

The analysis of patents, patents and scientific-technical in the information revealed no new significant features of the present invention according to their functional purpose. Thus, the proposed solution meets the criterion of "inventive step".

Figure 1 presents technological transitions stamping; figure 2 - the end of the deformation process upset billets, semi-finished and finally stamped forgings.

A method of manufacturing forgings with a hole is implemented as follows.

Monotonous forgings get a few transitions, for example three, in which the pre-heated source of the workpiece 1, obtained from a rod, rebuff, receiving the workpiece 2, then form a semi-finished product 3 jumper 4 ledge under the ridge 5 and free from contact with the tool surface 6, then, by deforming the semi-finished product 3, get permanently stamped forgings 7 jumper 8, Appendix 9 fin 10. Jumper 8 and Burr 10 remove one of the known methods (Okhrimenko AM Technology forging and stamping production. Textbook for high schools. Ed. 2nd, revised and enlarged extra - M.: Mashinostroenie, 1976, 560 S., ill., str-457).

The source of the workpiece 1, obtained from a rod, rebuff between the inserts 11 and 12. Inserts have shaped contact surface. For accurate based transplanted procurement stamp next hop these surfaces correspond to at least part of the side surface of the lower stamp of none is recata.

Received in the first passage of the workpiece 2 turn and lay flat in the stamp of the second transition, which consists of a matrix 13, the punch 14 and the ejectors 15 and 16. When the movement of the press slide down the punch 14 in the matrix 13 deforms upset the workpiece 2, forming a semi-finished product 3 jumper 4 and the guide under Appendix 5. When this surface 6 remain free from contact with the instrument. The semi-finished product with the jumper removed from the matrix 13 of the ejector 15 or separated from the punch ejector 16. The resulting intermediate product is placed in the stamp of the third transition, consisting of a matrix 17, the punch 18, ejectors 19 and 20. When the movement of the press slide down the punch 18 deforms the semi-finished product 3 in the matrix 17. The result is permanently stamped forged 7 jumper 8, Appendix 9 fin 10. After completion of process of deformation of the press slide is lifted up, forgings 7 is removed from the matrix 17 pullers 19 or separated from the punch ejector 20. Trimming Burr and punching holes provide one of the known methods (see, for example, A. Bryukhanov. Forging and die forging. - M.: Mashinostroenie, 1975, 408 S. Il., s-364).

Specific example forgings forgings tip of steel 30 GOST 1050-88

The original billet with a diameter of 70 mm and a height of 113 mm is heated in the induction is agrevate to forging temperature, served in the stamp heat punching press 16 MN in the first position stamping, rebuff before receiving barrel with spherical ends a height of 100 mm and a diameter of 82 mm is Mounted the workpiece is turned by 90 degrees, shift to the next stream and form a semi-finished product with a jumper and a ledge under process. The resulting intermediate product is sized by 0.4...0.5 mm less than the final stamped forgings. The upper end surface is free from contact with the instrument and have a variable height not lower than 60 mm and a height of permanently stamped forgings, equal to 57.9 mm Further prefabricated deform the stamp for final stamping preemptive excessive amount of metal in Burr thickness of 3 mm Trimming Burr and punching jumper produce on the trim press for one stroke of the RAM in the stamp combined actions.

Punching with a press 25 MN can be transferred to the press 16 MN.

Compared with the prototype of the proposed method for the manufacture of forgings more economical. Necessary efforts deformation below, in connection with which it was possible to use a press of smaller capacity.

1. A method of manufacturing a hollow forgings with a lateral process that includes heating the original piece, it sits, laying flat, forming a semi-finished product with a cavity and a jumper, the final forging is open stamp preemptive external Burr, remove the jumper and Burr, characterized in that the implement end draught of the original piece and shaping the workpiece with convex ends, then upset preparation turn, laid flatwise to form a semi-finished product with a cavity and a jumper, mostly in one half of the tool in the form of a stamp by hand and asymmetric with respect to the vertical axis of the cavity extrusion of metal up and to the side of the lateral process of the forging, with the upper end surface of the semi-finished product leave free from contact with the instrument.

2. The method according to claim 1, characterized in that the draught of the original billet is carried out until the height, the greater the diameter of the upset billet.

3. The method according to claim 1, characterized in that the draught of the original piece performed on the shape inserts, the surfaces of which correspond to a part of the side surface of the lower half of the stamp to form semi-finished product.

4. The method according to claim 1 or 3, characterized in that the draught of the original piece carry on the inserts, at least one of which has a spherical surface.

5. The method according to claim 1, wherein forming the semi-finished product with dimensions in plan, not to exceed the corresponding dimensions on the plan are permanently stamped hollow forgings with lateral process.

6. The method according to claim 1, characterized in, h in the form of a semi-finished product with a cavity and a jumper symmetrical relative to the vertical axis of the cavity.

7. The method according to claim 1, wherein forming the semi-finished product with a bridge of variable thickness.

8. The method according to claim 1 or 7, characterized in that the thickness of the jumper semi increase in the lateral side of the ridge.

9. The method according to claim 1, wherein forming the semi-finished product with a jumper at the final thickness.

10. The method according to claim 1, characterized in that the prefabricated form in two transitions.

11. The method according to claim 1, characterized in that during the final forming part of the surface of the jumpers leave free from contact with the instrument.



 

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EFFECT: improved quality of articles.

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20 cl, 6 dwg, 1 ex

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11 cl, 2 dwg, 1 ex

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EFFECT: lowered metal and energy consumption at process.

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6 dwg

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EFFECT: improved quality of articles.

5 dwg

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