CN105251917B - Cold upsetting-extruding forming method of thin-wall hollow positioning pin shaft - Google Patents

Cold upsetting-extruding forming method of thin-wall hollow positioning pin shaft Download PDF

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Publication number
CN105251917B
CN105251917B CN201510751460.2A CN201510751460A CN105251917B CN 105251917 B CN105251917 B CN 105251917B CN 201510751460 A CN201510751460 A CN 201510751460A CN 105251917 B CN105251917 B CN 105251917B
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China
Prior art keywords
pier
die
punch
chamfering
hole
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CN201510751460.2A
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CN105251917A (en
Inventor
汪邦斌
戴兴仁
汪秋萍
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Huangshan Zhongyou Chain Manufacture Co Ltd Of Anhui
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Huangshan Zhongyou Chain Manufacture Co Ltd Of Anhui
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Priority to CN201510751460.2A priority Critical patent/CN105251917B/en
Publication of CN105251917A publication Critical patent/CN105251917A/en
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21GMAKING NEEDLES, PINS OR NAILS OF METAL
    • B21G3/00Making pins, nails, or the like
    • B21G3/18Making pins, nails, or the like by operations not restricted to one of the groups B21G3/12 - B21G3/16
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21GMAKING NEEDLES, PINS OR NAILS OF METAL
    • B21G3/00Making pins, nails, or the like
    • B21G3/18Making pins, nails, or the like by operations not restricted to one of the groups B21G3/12 - B21G3/16
    • B21G3/28Making pins, nails, or the like by operations not restricted to one of the groups B21G3/12 - B21G3/16 by forging or pressing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B21MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21GMAKING NEEDLES, PINS OR NAILS OF METAL
    • B21G3/00Making pins, nails, or the like
    • B21G3/32Feeding material to be worked to nail or pin making machines

Abstract

The invention discloses a cold upsetting-extruding forming method of a thin-wall hollow positioning pin shaft. The cold upsetting-extruding forming method comprises the steps of cutting a round wound material to obtain a blank, carrying out primary upsetting to obtain a primary upset blank, carrying out secondary upsetting to obtain a secondary upset blank, pre-holing by upsetting to obtain an upset pre-holed material, performing front chamfering to obtain a front corner formed material, carrying out deep drawing to obtain a deep drawn material and performing rear chamfering and cutting off a base material to obtain a finished product. Compared with the prior art, the cold upsetting-extruding forming method has the advantages as follows: the round-wound material is selected as a raw material of the method instead of a finish drawn steel pipe and a requirement on the quality of the raw material is low; meanwhile, by using the method, the product can be automatically formed at a high speed by use of a six-station cold upsetting forming machine without secondary machining, and therefore, the production efficiency is high and the material utilization rate is high; and the cost of the product is reduced.

Description

A kind of cold upset extrusion shaping method of thin-walled hollow alignment pin
Technical field
The present invention relates to a kind of manufacture method of alignment pin, more particularly to a kind of thin-walled hollow alignment pin Cold upset extrusion shaping method.
Background technology
Thin-walled hollow alignment pin is present in the mould being made up of two parts or more parts, makes mould in closure phase Adjacent two parts are accurately positioned, so as to make perfect product.Because the monolateral wall thickness of thin-walled hollow alignment pin is relatively thin, typically only have 0.3-0.8mm, in addition to being easy to assembling, two ends need the rake angle of certain altitude, therefore product size tolerance and morpheme are public Difference requires very high.At present for the processing technique of thin-walled hollow alignment pin is:Cold drawn finish draw steel pipe → cut off → lathe is put down Surface chamfer → cylindrical grinding.Not only cost is very high for this processing mode, and working (machining) efficiency is very low, and Product Precision directly receives finish draw steel Pipe qualitative effects (material quality has high demands), plus man-hour, because product wall is thin, disqualification rate is also very high.
The content of the invention
It is an object of the invention to overcome the deficiencies in the prior art, there is provided a kind of cold-heading of thin-walled hollow alignment pin is squeezed Forming method, to solve the skills such as existing thin-walled hollow alignment pin processing technique high cost, the low, unstable product quality of efficiency Art problem.
The present invention is achieved by the following technical solutions:
A kind of cold upset extrusion shaping method of thin-walled hollow alignment pin, comprises the following steps:
(1) with disk circle material as raw material, disk circle material is cut by product specification using blank module, obtains the hair of cylinder Blank;
(2) blank material is carried out into first time pier pressure using a pier module, obtains a pier embryo;
(3) a pier embryo is overturn into 180 °, using two pier modules second pier pressure is carried out, obtain two pier embryos;
(4) two pier embryos are overturn into 180 °, using the pre- casement group of pier in the front end face pier hole of two pier embryos, obtains the pre- hole material of pier;
(5) by 180 ° of pier pre- hole material upset, using front chamfering module by the outer pier of the front end face of the pre- hole material of pier into chamfering, Obtain into front corner material;
(6) 180 ° will be overturn into front corner material, using drawing module by into the inside drawing in the pre- hole of the pier of front corner material, to drawing depth Degree is highly consistent with product requirement, obtains drawing material;
(7) deliver to drawing material is flat chamfering and cut off in module, module is cut off by the bottom surface outer pier of drawing material using chamfering Into after rear chamfering, then bottom surface is cut off, obtain thin-walled hollow alignment pin product.
The blank module includes moving cutting tool and fixed cutting tool;
A pier module described in described one includes being corresponding in turn to punch after punch before a pier of setting, a pier die and a pier, The one pier die is the die that inner chamber is cylinder, and it has front die orifice and rear die orifice, and thereafter die orifice is less than front die orifice, described Punch enters the inner chamber of a pier die by die orifice thereafter after one pier;
The two piers module includes being corresponding in turn to punch after punch before two piers of setting, two pier dies and two piers, and described two Pier die is the die that inner chamber is cylinder, and it has front die orifice and rear die orifice, and thereafter die orifice is less than front die orifice, after two piers Punch enters the inner chamber of two pier dies by die orifice thereafter;
The pre- casement group of the pier includes being corresponding in turn to convex after the pre- hole die of punch, pier and the pre- hole of pier before the pre- hole of the pier of setting Mould, the leading section of punch is provided with the pre- hole of pier and works head before the pre- hole of the pier, and the pre- hole die of the pier is that inner chamber is the recessed of cylinder Mould, it has front die orifice and rear die orifice, and thereafter die orifice is less than front die orifice, and punch enters pier by die orifice thereafter behind the pre- hole of the pier The inner chamber of pre- hole die;
The front chamfering module is convex after punch, front chamfering die and front chamfering before the front chamfering of setting including being corresponding in turn to Mould, the front chamfering die has front die orifice and rear die orifice, and its forward and backward die orifice joint is set by the angle requirement of chamfering before product There is chamfering step, the inner chamber bore of its chamfering step bottom forms a land plateau, for controlling slightly larger than die orifice bore thereafter The height dimension of front chamfering and higher end face flatness, and product end surface not oarsman, the front end of punch after the front chamfering Portion is provided with front chamfering work head, and enters the inner chamber of front chamfering die by the rear die orifice of front chamfering die;
The drawing module includes being corresponding in turn to punch after punch before the drawing of setting, drawing die and drawing, the drawing Punch includes the drawing work band being sequentially connected and drawing work head before deep, and the size of the drawing work head is equal to product internal orifice Footpath size, the diameter dimension of the drawing work band is less than the 0.3mm of drawing work head diameter dimension, and the drawing die is straight Logical mould, punch enters the inner chamber of drawing die by the die cavity rear portion of drawing die after the drawing;
The chamfering cuts off module includes that being corresponding in turn to punch and chamfering before the rear chamfering of setting cuts off synchronous mould, it is described after The size and the interior bore consistent size of drawing material of the work head of punch, which is provided with steam vent, with chamfering after guarantee before chamfering Front punch is entered after the endoporus of drawing material, and air and oil can be discharged in time in hole, it is to avoid punch before chamfering after under powerful air pressure Deviation phenomenon and product is had undesirable effect;The chamfering cuts off rear chamfering die, the right angle that synchronous mould includes being sequentially connected Step and rear die orifice are cut off, the surface of internal cavity of the rear chamfering die is the inside conical surface for tightening, and its frustoconical bevel angle is after product The angle of chamfering, the inner chamber bore of its conical surface bottom is more than bore 0.10-0.35mm in product;Cut off and set at step in the right angle There is bed material shearing blade, for cutting off bed material.
Punch, fixed cutting tool, moving cutting tool, a pier die, two pier dies, pier are pre- before punch, drawing before the pre- hole of the pier Hole die, front chamfering die, drawing die, chamfering are cut off synchronous mould and are alloy material and make, and surface smoothness is good, produces Product Precision, qualification rate it is high, and big pier extruding force can be born.
Punch, the front punch of front chamfering, the front punch of drawing, rear chamfering before the front punch of one pier, the front punch of two piers, the pre- hole of pier Front punch be in turn secured to one before on punch slide plate, and with front punch slide plate synchronizing moving;
The fixed cutting tool, a pier die, two pier dies, the pre- hole die of pier, front chamfering die, drawing die and chamfering are cut Disconnected synchronization mould is in turn secured in fixed plate;
Punch is solid successively after punch and drawing after punch, front chamfering behind punch, the pre- hole of pier after punch, two piers after one pier On punch slide plate after, and subsequently punch slide plate synchronizing moving.
The pre- hole of the pier works the endoporus aperture size for being smaller in size than into front corner material of head, its depth for product front chamfering Length, so that the chamfering of molding is substantially, meets product requirement.
, more than the endoporus aperture size of the pre- hole material of pier, it is highly higher than the pre- hole material of pier for the size of the front chamfering work head Bore depth.
Expect, realize upset or put down by operating clamp to send into front corner material, drawing material in the pre- hole of the one pier embryo, two pier embryos, pier Transport.
The moving cutting tool and operating clamp are located in operating module, and with operating module synchronizing moving, the operational mode Include some sector gears on block, the operating clamp is connected with sector gear, and completes upset by sector gear.
The present invention has compared to existing technology advantages below:The invention provides a kind of cold-heading of thin-walled hollow alignment pin Extrusion forming method, the raw material of the method is changed to disk circle material by car system with finish draw steel pipe, low to material quality requirement, meanwhile, The method completes the molding of product using six station cold headers are High-Speed Automatic, and does not need secondary operations, production efficiency Height, stock utilization is high, reduces the cost of product.
Description of the drawings
Fig. 1 is the cold upset extrusion shaping method product forming technique flow chart of thin-walled hollow alignment pin;
Fig. 2 is a kind of structural representation of the six station cold headers suitable for the method for the invention;
Fig. 3 is the structural representation of the front chamfering module of six station cold headers;
Fig. 4 is the structural representation of the drawing module of six station cold headers.
Fig. 5 is the structural representation that the chamfering of six station cold headers cuts off module;
Specific embodiment
Embodiments of the invention are elaborated below, the present embodiment is carried out under premised on technical solution of the present invention Implement, give detailed embodiment and specific operating process, but protection scope of the present invention is not limited to following enforcements Example.
Embodiment 1
A kind of cold upset extrusion shaping method of thin-walled hollow alignment pin that the present embodiment is provided, the method can be using a kind of six Automatically operating is completed station cold header, and high degree of automation, production efficiency is high.
The six stations cold header has structure as shown in Figure 2-5, including blank module, a pier module, two piers The pre- casement group of module, pier, front chamfering module, drawing module, chamfering cut off module, operating clamp 8 and material returned disk 9, in figure, with a left side While being the front direction of six station cold headers, the right is the rear direction of six station cold headers.
The blank module includes fixed cutting tool 11 and moving cutting tool 12.
The one pier module includes being corresponding in turn to punch 23 after punch 21 before a pier of setting, a pier die 22 and a pier, The one pier die 22 is the die that inner chamber is cylinder, and it has front die orifice and rear die orifice, and thereafter die orifice is less than front die orifice, institute State the inner chamber that punch 23 after a pier enters a pier die 22 by die orifice thereafter.
The two piers module includes being corresponding in turn to punch 33 after punch 31 before two piers of setting, two pier dies 32 and two piers, The two piers die 32 is the die that inner chamber is cylinder, and it has front die orifice and rear die orifice, and thereafter die orifice is less than front die orifice, institute State the inner chamber that punch 33 after two piers enters two pier dies 32 by die orifice thereafter.
The pre- casement group of the pier is included being corresponding in turn to before the pre- hole of the pier of setting after the pre- hole die 42 of punch 41, pier and the pre- hole of pier Punch 43, the leading section of punch 41 is provided with the pre- hole of pier and works head before the pre- hole of the pier, and the pre- hole die 42 of the pier is that inner chamber is circle The die of cylinder, it has front die orifice and rear die orifice, and thereafter die orifice is less than front die orifice, and punch 43 is by thereafter behind the pre- hole of the pier Die orifice enters the inner chamber of the pre- hole die 42 of pier.
As shown in figure 3, the front chamfering module includes being corresponding in turn to punch 51, front chamfering die 52 before the front chamfering of setting With punch 53 after front chamfering, the front chamfering die 52 with front die orifice and rear die orifice, press before product by its forward and backward die orifice joint The angle requirement of chamfering is provided with chamfering step 521, and the inner chamber bore of its chamfering step bottom is formed slightly larger than die orifice bore thereafter One less land plateau 522, for controlling the height dimension and higher end face flatness of front chamfering, and product end surface is not Oarsman;The leading section of punch 53 is provided with front chamfering work 531, the size of the front chamfering work 531 after the front chamfering More than the endoporus aperture size of the pre- hole material of pier, its height is slightly above the bore depth of the pre- hole material of pier, and by front chamfering die 52 Rear die orifice enter front chamfering die 52 inner chamber.
As shown in figure 4, the drawing module includes being corresponding in turn to punch 61 before the drawing of setting, drawing die 62 and drawing Punch 63 afterwards, punch 61 includes the drawing work band 611 being sequentially connected and drawing work 612, the drawing before the drawing The size of work 612 is equal to caliber size in product, and the drawing work is straight less than drawing work head with 611 diameter dimension The 0.3mm of footpath size, the drawing die 62 is straight-through mould, the die cavity rear portion that punch 63 passes through drawing die 62 after the drawing Into the inner chamber of drawing die 62;
As shown in figure 5, the chamfering cuts off module includes that being corresponding in turn to punch 71 and chamfering before the rear chamfering of setting cuts off Synchronous mould 72, punch 71 is provided with steam vent 711 before the rear chamfering, and with punch 71 before chamfering after guarantee product endoporus is entered Afterwards, air and oil can be discharged in time in hole, it is to avoid powerful air pressure lower punch deviation phenomenon and product be had undesirable effect;Institute Stating chamfering and cutting off synchronous mould 72 includes that the rear chamfering die 721, right angle that is sequentially connected cuts off step 722 and rear die orifice 723, described Afterwards the surface of internal cavity of chamfering die 721 is the inside conical surface for tightening, and its frustoconical bevel angle is the angle of chamfering after product, its conical surface bottom The inner chamber bore in portion is more than bore 0.10-0.35mm in product;The right angle is cut off and be provided with step 722 bed material shearing blade, uses In cutting off bed material.
Punch 61, fixed cutting tool 11, moving cutting tool 12, a pier die 22, two piers before punch 41, drawing before the pre- hole of the pier The pre- hole die 42 of die 32, pier, front chamfering die 52, drawing die 62, chamfering cut off synchronous mould 72 and are alloy material and make, Surface smoothness is good, Product Precision, the qualification rate height produced, and can bear big pier extruding force.
Punch 51, drawing lordosis before punch 41, front chamfering before the pre- hole of punch 31, pier before punch 21, two piers before one pier Before punch 71 is in turn secured to one before mould 61, rear chamfering on punch slide plate 10, and with the front synchronizing moving of punch slide plate 10;It is described solid Cutter 11, a pier die 22, the pre- hole die 42 of two pier dies 32, pier, front chamfering die 52, drawing die 62 and chamfering are cut off Synchronous mould 72 is in turn secured in a fixed plate 20;Punch 43 behind the pre- hole of punch 33, pier after punch 23, two piers after one pier, After punch 63 is in turn secured to one after punch 53 and drawing after front chamfering on punch slide plate (not being given in figure), and subsequently punch is slided Plate synchronizing moving;The moving cutting tool 12 and operating clamp 8 operate in module (not being given in figure) located at one, and with operating module Synchronizing moving, includes some sector gears in the operating module, the operating clamp 8 is connected with sector gear, and by fan Shape gear completes upset.
The cold upset extrusion shaping method of the thin-walled hollow alignment pin, it is with technological process as shown in Figure 1 including following Step:
(1) with disk circle material as raw material, disk raw material is cut by product specification using moving cutting tool 12, obtains cylinder Blank material;
(2) blank material is transported to moving cutting tool 12 the front die orifice of a pier die 22, and front punch slide plate 10 is driven before a pier Punch 21 slides, and blank material is pushed carries out pier pressure in a pier die 22, and after pier pressure terminates, rear punch slide plate is moved forward, band Punch 23 is moved after a dynamic pier, and punch 23 is pushed away the blank material after first time pier pressure by the rear die orifice of a pier die 22 after a pier Go out to operating clamp 8, obtain a pier embryo 101;
(3) a pier embryo 101 is overturn 180 ° by the clamp 8 that operates, and is transported to the front die orifice of two pier dies 32, front punch slide plate Punch 31 slides before 10 two piers of drive, and a pier embryo 101 is pushed carries out pier pressure, after pier pressure terminates, rear punch in two pier dies 32 Slide plate is moved forward, and drives punch 33 after two piers to move, and punch 33 will be for the second time by the rear die orifice of two pier dies 32 after two piers A pier embryo 101 after pier pressure is pushed out on operating clamp 8, obtains two pier embryos 102;After a pier and the compacting of two piers, under cutting The disk circle material blank for coming is into the cylinder of even circumferential;
(4) two pier embryos 102 are overturn 180 ° by the clamp 8 that operates, and are transported to the front die orifice of the pre- hole die 42 of pier, and front punch is slided Plate 10 drives punch 41 before the pre- hole of pier to pier pre- hole die 42 punching press, two pier embryos 102 to be pushed in the pre- hole die 42 of pier, and passes through The pre- hole of the pier of its end works head, and (it is front end that two pier embryos 102 have the end faces in pier hole in pier hole on the end face of two pier embryos 102 Face), obtain the pre- hole material 103 of pier;Wherein, the pier hole of two pier embryos 102 is smaller in size than the endoporus into front corner material 104 described below Aperture size, its depth is the front chamfering length of product, so that the chamfering of molding is substantially, meets product requirement;After pier pressure terminates, Afterwards punch slide plate drives punch 43 behind the pre- hole of pier to move, and punch 43 is pre- by pier by the rear die orifice of the pre- hole die 42 of pier behind the pre- hole of pier Hole material 103 is pushed out on operating clamp 8;
(5) clamp 8 is operated by pier 180 ° of upset of pre- hole material 103, and be transported to the front die orifice of front chamfering die 52, front punch Slide plate 10 drives punch 51 before front chamfering to slide, and the pre- hole material 103 of pier is pushed in front chamfering die 52, now, the pre- hole material 103 of pier The outer of front end face contact with the intracavity bottom of front chamfering die 52, meanwhile, convex film 53 is by front chamfering die after front chamfering 52 rear die orifice is moved at the chamfering step 521 of front chamfering die 52, and its front chamfering work 531 expects 103 with the pre- hole of pier Pier hole pier pressure again;During pier pressure, in the presence of the chamfering step 521 of the intracavity bottom of front chamfering die 52, the pre- hole of pier The outer of the front end face of material 103 forms chamfering, and using the less land plateau 522 of bottom, the height of chamfering before control Size and higher end face flatness, obtain into front corner material 104;After pier pressure terminates, convex film 53 continues to reach after front chamfering It is dynamic, operating clamp 8 will be pushed out to into front corner material 104;
(6) clamp 8 that operates will overturn 180 ° into front corner material 104, and be transported to the front die orifice of drawing die 62, and front punch is slided Plate 10 drives punch 61 before drawing to slide, and will push in drawing die 62 into front corner material 104, and now punch 61 continues to transport before drawing It is dynamic, its drawing work 612 with coordinate into the pier hole of front corner material 104, and inwardly advance, will be into the drawing of front corner material 104 to product The height of requirement, obtains drawing material 105, after drawing terminates, after drawing convex film by the die cavity rear portion of drawing die 62 by drawing Material 105 is pushed out to operating clamp 8;
(7) clamp 8 that operates delivers to the front die orifice that chamfering cuts off synchronous mould 72, punch 71 before rear chamfering by drawing material 105 is flat External diameter it is consistent with the internal orifice dimension of drawing material 105, when punch 71 is advanced to drawing material 105 before rear chamfering, punch before rear chamfering 71 are enclosed within the aperture of drawing material 105, drawing material 105 is pushed into rear chamfering and is cut off in synchronous mould 72, and in rear chamfering die 721 The conical surface in the presence of, formed chamfering;Afterwards punch 71 continues to advance before chamfering, cuts off the bed material on step 722 using right angle and cuts Breaking, the bed material of drawing material 105 is cut off, and obtains thin-walled hollow alignment pin finished product 106;Finally, before rear chamfering punch 71 with The rollback of thin-walled hollow alignment pin finished product 106, in the presence of material returned disk 9, by thin-walled hollow alignment pin finished product 106 from it is rear fall Depart from punch 71 before angle, complete Product processing.

Claims (8)

1. a kind of cold upset extrusion shaping method of thin-walled hollow alignment pin, it is characterised in that comprise the following steps:
(1) with disk circle material as raw material, disk circle material is cut by product specification using blank module, obtains the blank of cylinder Material;
(2) blank material is carried out into first time pier pressure using a pier module, obtains a pier embryo;
(3) a pier embryo is overturn into 180 °, using two pier modules second pier pressure is carried out, obtain two pier embryos;
(4) two pier embryos are overturn into 180 °, using the pre- casement group of pier in the front end face pier hole of two pier embryos, obtains the pre- hole material of pier;
(5) by 180 ° of pier pre- hole material upset, the outer pier of the front end face of the pre- hole material of pier is obtained into chamfering using front chamfering module Into front corner material;
(6) 180 ° will be overturn into front corner material, using drawing module by into the inside drawing in the pre- hole of the pier of front corner material, to drawing depth with Product requirement is highly consistent, obtains drawing material;
(7) deliver to drawing material is flat chamfering and cut off in module, module is cut off by the bottom surface outer pier of drawing material into rear using chamfering After chamfering, then bottom surface is cut off, obtain thin-walled hollow alignment pin product.
2. the cold upset extrusion shaping method of a kind of thin-walled hollow alignment pin according to claim 1, it is characterised in that:
The blank module includes moving cutting tool and fixed cutting tool;
The one pier module includes being corresponding in turn to punch after punch before a pier of setting, a pier die and a pier, and a pier is recessed Mould is the die that inner chamber is cylinder, and it has front die orifice and rear die orifice, and thereafter die orifice is less than front die orifice, punch after a pier The inner chamber of one pier die is entered by die orifice thereafter;
The two piers module includes being corresponding in turn to punch after punch before two piers of setting, two pier dies and two piers, and two pier is recessed Mould is the die that inner chamber is cylinder, and it has front die orifice and rear die orifice, and thereafter die orifice is less than front die orifice, punch after two piers The inner chamber of two pier dies is entered by die orifice thereafter;
The pre- casement group of the pier includes being corresponding in turn to before the pre- hole of the pier of setting punch, institute after the pre- hole die of punch, pier and the pre- hole of pier The leading section for stating punch before the pre- hole of pier is provided with the pre- hole of pier and works head, and the pre- hole die of the pier is inner chamber for the die of cylinder, its With front die orifice and rear die orifice, thereafter die orifice is less than front die orifice, and punch enters the pre- hole of pier by die orifice thereafter behind the pre- hole of the pier The inner chamber of die;
The front chamfering module includes being corresponding in turn to before the front chamfering of setting punch, institute after punch, front chamfering die and front chamfering State front chamfering die and there is front die orifice and rear die orifice, its forward and backward die orifice joint is provided with down by the angle requirement of chamfering before product Angle step, the inner chamber bore of its chamfering step bottom forms a land plateau more than die orifice bore thereafter, convex after the front chamfering The leading section of mould is provided with front chamfering work head, and enters the inner chamber of front chamfering die by the rear die orifice of front chamfering die;
The drawing module includes being corresponding in turn to punch after punch before the drawing of setting, drawing die and drawing, before the drawing Punch includes the drawing work band being sequentially connected and drawing work head, and the size of the drawing work head is equal to bore chi in product Very little, the diameter dimension of the drawing work band is less than the 0.3mm of drawing work head diameter dimension, and the drawing die is straight-through Mould, punch enters the inner chamber of drawing die by the die cavity rear portion of drawing die after the drawing;
The chamfering cuts off module includes that being corresponding in turn to punch and chamfering before the rear chamfering of setting cuts off synchronous mould, the rear chamfering The size and the interior bore consistent size of drawing material of the work head of front punch, which is provided with steam vent;The chamfering cuts off synchronization Mould includes that the rear chamfering die that is sequentially connected, right angle cut off step and rear die orifice, the surface of internal cavity of the rear chamfering die be to The conical surface of interior deflation, its frustoconical bevel angle is the angle of chamfering after product, and the inner chamber bore of its conical surface bottom is more than bore in product 0.10-0.35mm;Cut off and be provided with step bed material shearing blade in the right angle.
3. the cold upset extrusion shaping method of a kind of thin-walled hollow alignment pin according to claim 2, it is characterised in that described Punch, fixed cutting tool, moving cutting tool, a pier die, two pier dies, the pre- hole die of pier, front chamfering before punch, drawing before the pre- hole of pier Die, drawing die, chamfering are cut off synchronous mould and are alloy material and make.
4. the cold upset extrusion shaping method of a kind of thin-walled hollow alignment pin according to claim 2, it is characterised in that described Punch is solid successively before punch, the front punch of front chamfering, the front punch of drawing, rear chamfering before the front punch of one pier, the front punch of two piers, the pre- hole of pier On punch slide plate before, and with front punch slide plate synchronizing moving;
The fixed cutting tool, a pier die, two pier dies, the pre- hole die of pier, front chamfering die, drawing die and chamfering plane of shear Step mould is in turn secured in fixed plate;
Punch is in turn secured to after punch and drawing after punch, front chamfering behind punch, the pre- hole of pier after punch, two piers after one pier After one on punch slide plate, and subsequently punch slide plate synchronizing moving.
5. the cold upset extrusion shaping method of a kind of thin-walled hollow alignment pin according to claim 2, it is characterised in that described The endoporus aperture size for being smaller in size than into front corner material of the pre- hole work head of pier, its depth is the front chamfering length of product.
6. the cold upset extrusion shaping method of a kind of thin-walled hollow alignment pin according to claim 2, it is characterised in that described , more than the endoporus aperture size of the pre- hole material of pier, it is highly higher than the bore depth of the pre- hole material of pier for the size of front chamfering work head.
7., according to a kind of cold upset extrusion shaping method of the arbitrary described thin-walled hollow alignment pin of claim 2-6, its feature exists In the pre- hole of the pier embryo, two pier embryos, pier expects, realized upset or put down by operating clamp to send transport into front corner material, drawing material.
8. the cold upset extrusion shaping method of a kind of thin-walled hollow alignment pin according to claim 7, it is characterised in that described Moving cutting tool and operating clamp include some in operating module, and with operating module synchronizing moving in the operating module Sector gear, the operating clamp is connected with sector gear, and completes upset by sector gear.
CN201510751460.2A 2015-11-05 2015-11-05 Cold upsetting-extruding forming method of thin-wall hollow positioning pin shaft Active CN105251917B (en)

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