CN104550287A - Cold extrusion moulding device for tapered pipe - Google Patents

Cold extrusion moulding device for tapered pipe Download PDF

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Publication number
CN104550287A
CN104550287A CN201410754438.9A CN201410754438A CN104550287A CN 104550287 A CN104550287 A CN 104550287A CN 201410754438 A CN201410754438 A CN 201410754438A CN 104550287 A CN104550287 A CN 104550287A
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CN
China
Prior art keywords
die
cavity
cold
conical
pipe
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Pending
Application number
CN201410754438.9A
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Chinese (zh)
Inventor
刘应
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CHONGQING ZHENGSONG TECHNOLOGY SERVICES Co Ltd
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CHONGQING ZHENGSONG TECHNOLOGY SERVICES Co Ltd
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Priority to CN201410754438.9A priority Critical patent/CN104550287A/en
Publication of CN104550287A publication Critical patent/CN104550287A/en
Pending legal-status Critical Current

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Abstract

The invention provides a cold extrusion moulding device for a tapered pipe. The cold extrusion moulding device comprises a female mould and a male mould, wherein the female mould is provided with a tapered mould cavity matched with the shape of the tapered tape, and a mould cavity of the female mould comprises a guide cavity and a shrinking hoop moulding cavity; the length and the shape of the shinking hoop moulding cavity are matched with those of the tapered pipe, and the inner diameter of the guide cavity is equal to the outer diameter of a circular pipe blank; in the later period of cold extrusion moulding, the male mould end extends into the guide cavity of the female mould to extrude the end surface of the blank. The cost of raw materials required by manufacturing the tapered pipe is low, the strength of a large end of the produced tapered pipe is greatly improved, and cracks cannot be generated at the large end in production, so that the yield of a product is improved.

Description

A kind of conical pipe cold-extrusion shaping device
Technical field
The present invention relates to cold extrusion device, especially the cold-extrusion shaping device of conical pipe.
Background technology
Cold extrusion technology processing and manufacturing conical pipe is adopted to have certain difficulty, when reason is that punch and die relative motion squeeze out taper, a harmful horizontal component can be produced, this not only requires high to mould, also easily there is crackle and cause low qualified in product, especially just all the more so as this long product of conical riser of direction column of motorcycle.Therefore, in the processing of conical riser of direction column of motorcycle in early days, usual employing be that formed by forging is carried out to round steel blank, because formed by forging technique exists waste material, production efficiency is low and percent defective is high problem, in recent years, someone breaks through Traditional Thinking limitation, in employing cold-extrusion technology processing and manufacturing conical riser of direction column of motorcycle, carried out some bold trials.
As being CN1232366C at notification number, the day for announcing is on December 21st, 2005, in the Chinese patent that name is called " method and the device of motorcycle direction conical riser are produced in cold extrusion ", utilizing the acting in conjunction of reaming mould and contracting hoop mould, is conical riser by isodiametric pipe blank through two to three step cold-extrusion shapings.Be CN100441369C at notification number, the day for announcing is on December 10th, 2008, name is called in the Chinese patent of " directional axial conical standpipe process of motorcycle by disposable cold extruding formative machining ", being then adopt the cold extrusion device having the guiding cold extruding upper male die of column sleeve and lower cavity die to be combined into high rigid high strength, is conical riser by equal diameter pipe blank extrusion molding once.
In above-mentioned two patents, method therefor and device are compared with the technique of traditional heating formed by forging, although all significantly enhance production efficiency, save labour, reduce manufacturing cost, but the die in its cold-extrusion shaping device is all made up of contracting hoop mould and reaming mould, particularly middle and later periods shaping stage in forming process, pipe blank also exists the deformation of contracting hoop and reaming simultaneously, the deformation of reaming is just started when pipe blank does not also enter into matrix cavity completely, be easy to like this occur crackle at reaming end, affect the qualification rate of product.Moreover, large end is formed because needs carry out reaming, for guaranteeing the intensity of final products, in the selection of pipe blank, wall thickness be selected to be greater than the thick raw material of the large end wall of finished product conical riser, but raw-material wall thickness again can not be too large, the shaping of small end is unfavorable for because too thick, this is often difficult to take into account, and consider cost factor, the intensity of the large end of finished product conical riser that actual production goes out is all generally on the low side.
Summary of the invention
The object of this invention is to provide a kind of conical pipe cold-extrusion shaping device, the cost of raw material utilizing this device to manufacture needed for conical pipe is low, the intensity of its large end of the conical pipe produced is greatly improved, and in production, large end there will not be crackle, thus improves the qualification rate of product.
For realizing above-mentioned technical purpose, conical pipe cold-extrusion shaping device provided by the invention, include die and punch, die has the conical cavity matched with conical pipe profile, the die cavity of die is made up of directed cavity and contracting hoop forming cavity, and the length of contracting hoop forming cavity and shape and conical pipe match, and the internal diameter of directed cavity is equal with the external diameter of pipe blank, in the later stage of cold-extrusion shaping, punch end protrudes in the directed cavity of die and extrudes blank end face.
During use, first pipe blank is put into die, start forcing press, make punch end aim at the end face of pipe blank, only slowly apply axial compressive force to pipe blank, pipe blank is just extruded for conical pipe in die cavity.
Owing to only having contracting hoop forming cavity in die, do not have ream forming chamber, during work, punch end only applies axial compressive force to pipe blank, and pipe blank is in conical pipe process in extrusion, and the flow direction of metal, except axis, is mainly radial direction inwards.Two patents being CN1232366C with CN100441369C with notification number are compared, and produce the conical pipe of same size, the wall thickness of required raw material and pipe blank is smaller, and caliber is then larger.In steel market, the tubing price that external diameter is large, wall thickness is little is relatively cheap, and the cost of raw material thus required for the present invention is low.Because the large end at conical pipe is without reaming crimp, after cold extrusion operation, the pipe thickness of large end does not reduce, consistent with the wall thickness of raw material pipe blank, the intensity of large end obtains Reliable guarantee, and crackle can not be there is because of reaming crimp in large end, add the guide effect of directed cavity, greatly can improve the qualification rate of product.
Further, contracting hoop forming cavity is connected as a single entity successively by maximum equal diameter section, conical section, less equal diameter section and minimum equal diameter section and is seamlessly transitted, the internal diameter of contracting hoop forming cavity maximum equal diameter section is equal with the internal diameter of directed cavity, makes it to be suitable for for producing conical riser of direction column of motorcycle.
Further, die is stacked in die sleeve by two or more mold cavity block and forms, end cap is fixedly equipped with in the upper end of die sleeve, this structure is adopted not only to be convenient to the processing of mould, reduce manufacture difficulty and the cost of mould, mold cavity block and die sleeve also can select different materials as required, and mold cavity block can be changed.
Further, die is fixed on die socket, punch is fixed on convex mould base, die socket is provided with lead, convex mould base is provided with fairlead, cooperatively interact between lead and fairlead during cold extrusion work, utilize the guide effect between lead and fairlead, make cold extrusion working stability, reliably, improve die life.
Further, punch end is provided with positioning boss, and the diameter of positioning boss is consistent with the aperture of pipe blank, and during cold extrusion work, this positioning boss stretches into pipe blank endoporus, and positioning boss makes the movement of pipe blank in die stablize.
The technique effect that the present invention obtains is: the cost of raw material manufactured needed for conical pipe is low, the intensity of its large end of the conical pipe produced is greatly improved, and in production, the large end of conical pipe there will not be crackle, and product percent of pass is high, plant running is reliable and stable, long service life.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention.
Fig. 2 is the A-A sectional view of Fig. 1.
Fig. 3 is the schematic diagram being in cold extrusion work original state during the present invention uses.
Fig. 4 is the schematic diagram being in cold extrusion work end of a period state during the present invention uses.
In figure: 1. maximum equal diameter section; 2. conical section; 3. less equal diameter section; 4. minimum equal diameter section; 5. directed cavity; 6. punch; 6a. positioning boss; 7. die sleeve; 8. end cap; 9. die socket; 10. convex mould base; 11. leads; 12. fairleads; 13. push rods.
Detailed description of the invention
Below in conjunction with the drawings and specific embodiments, the present invention is elaborated.
As shown in Figure 1 and Figure 2, conical pipe cold-extrusion shaping device of the present invention, there is die and punch 6, die has the conical cavity matched with conical pipe profile, the die cavity of die is made up of directed cavity 5 and contracting hoop forming cavity, and the length of contracting hoop forming cavity and shape and conical pipe match, and the internal diameter of directed cavity 5 is equal with the external diameter of pipe blank, in the later stage of cold-extrusion shaping, punch 6 end protrudes in the directed cavity 5 of die and extrudes blank end face.
To produce the cold-extrusion shaping device of conical riser of direction column of motorcycle, contracting hoop forming cavity is connected as a single entity successively by maximum equal diameter section 1, conical section 2, less equal diameter section 3 and minimum equal diameter section 4 and is seamlessly transitted, and the internal diameter of contracting hoop forming cavity maximum equal diameter section 1 is equal with the internal diameter of directed cavity 5.
Die is stacked in die sleeve 7 li by two or more mold cavity block and forms, end cap 8 is fixedly equipped with in the upper end of die sleeve 7, in the present embodiment, contracting is bound round the conical section 2 of forming cavity, less equal diameter section 3 and minimum equal diameter section 4 and is respectively had an independently mold cavity block of one's own, and the maximum equal diameter section 1 of contracting hoop forming cavity becomes an independently mold cavity block together with directed cavity 5.So not only be convenient to the processing of mould, reduce manufacture difficulty and the cost of mould, mold cavity block and die sleeve also can select different materials as required, and mold cavity block can be changed.
Die is fixed on die socket 9, punch 6 is fixed on convex mould base 10, die socket 9 is provided with lead 11, convex mould base 10 is provided with fairlead 12, cooperatively interact between lead 11 and fairlead 12 during cold extrusion work, utilize the guide effect between lead 11 and fairlead 12, make cold extrusion working stability, reliably, improve die life.During use, die socket 9 is fixed on the workbench of forcing press, and convex mould base 10 is fixed on the lifting platform of forcing press.
Punch 6 end is provided with positioning boss 6a, the diameter of positioning boss 6a is consistent with the aperture of pipe blank, in Fig. 3, Fig. 4, double dot dash line is expressed as the profile of pipe blank and conical pipe, during cold extrusion work, this positioning boss 6a stretches into pipe blank endoporus, and positioning boss 6a makes the movement of pipe blank in die stablize.
See Fig. 3, pipe blank is put into die, start forcing press, punch 6 end is made to aim at the end face of pipe blank, only slowly apply axial compressive force to pipe blank, pipe blank is just extruded for the conical pipe shown in Fig. 4 in die cavity, and last punch 6 resets, and conical pipe is ejected die by push rod 13.Owing to only having contracting hoop forming cavity in die, do not have ream forming chamber, during work, punch 6 only applies axial compressive force to pipe blank, and pipe blank is in conical pipe process in extrusion, and the flow direction of metal, except axis, is mainly radial direction inwards.Facts have proved, other produces compared with the cold extrusion device of direction column of motorcycle conical pipe with on market, and produce the conical pipe of same size, the wall thickness of required raw material and pipe blank is smaller, and caliber is then larger, and the cost of raw material is low.At the large end of conical pipe without reaming crimp, after cold extrusion operation, the pipe thickness of large end does not reduce, consistent with the wall thickness of raw material pipe blank, the intensity of the large end of conical pipe obtains Reliable guarantee, crackle can not be there is in large end because of reaming crimp, add the guide effect of directed cavity, improve the qualification rate of product.

Claims (6)

1. a conical pipe cold-extrusion shaping device, include die and punch, die has the conical cavity matched with conical pipe profile, it is characterized in that: the die cavity of described die is made up of directed cavity and contracting hoop forming cavity, the contracting hoop length of forming cavity and shape and conical pipe match, the internal diameter of directed cavity is equal with the external diameter of pipe blank, and in the later stage of cold-extrusion shaping, punch end protrudes in the directed cavity of die and extrudes blank end face.
2. a kind of conical pipe cold-extrusion shaping device as claimed in claim 1, is characterized in that: described contracting hoop forming cavity is connected as a single entity successively by maximum equal diameter section, conical section, less equal diameter section and minimum equal diameter section and is seamlessly transitted.
3. a kind of conical pipe cold-extrusion shaping device as claimed in claim 2, is characterized in that: the internal diameter of described contracting hoop forming cavity maximum equal diameter section is equal with the internal diameter of directed cavity.
4. as a kind of conical pipe cold-extrusion shaping device in claims 1 to 3 as described in any one, it is characterized in that: described die is stacked in die sleeve by two or more mold cavity block and forms, and end cap is fixedly equipped with in the upper end of die sleeve.
5. a kind of conical pipe cold-extrusion shaping device as claimed in claim 4, it is characterized in that: described die is fixed on die socket, punch is fixed on convex mould base, die socket is provided with lead, convex mould base is provided with fairlead, cooperatively interacts between lead and fairlead during cold extrusion work.
6. a kind of conical pipe cold-extrusion shaping device as claimed in claim 1, it is characterized in that: described punch end is provided with positioning boss, the diameter of positioning boss is consistent with the aperture of pipe blank, and during cold extrusion work, this positioning boss stretches into pipe blank endoporus.
CN201410754438.9A 2014-12-11 2014-12-11 Cold extrusion moulding device for tapered pipe Pending CN104550287A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410754438.9A CN104550287A (en) 2014-12-11 2014-12-11 Cold extrusion moulding device for tapered pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410754438.9A CN104550287A (en) 2014-12-11 2014-12-11 Cold extrusion moulding device for tapered pipe

Publications (1)

Publication Number Publication Date
CN104550287A true CN104550287A (en) 2015-04-29

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105689423A (en) * 2016-03-11 2016-06-22 南通昌荣机电有限公司 Extrusion method for manufacturing taper sleeve
CN108080434A (en) * 2017-12-29 2018-05-29 重庆郭氏洪伸科技有限公司 A kind of processing method and stamping die of step deep hole axial workpiece

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105689423A (en) * 2016-03-11 2016-06-22 南通昌荣机电有限公司 Extrusion method for manufacturing taper sleeve
CN108080434A (en) * 2017-12-29 2018-05-29 重庆郭氏洪伸科技有限公司 A kind of processing method and stamping die of step deep hole axial workpiece
CN108080434B (en) * 2017-12-29 2019-11-08 重庆郭氏洪伸科技有限公司 A kind of processing method and stamping die of step deep hole axial workpiece

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Application publication date: 20150429

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