CN103785699A - Method for forming hollowing portion of shaft portion - Google Patents
Method for forming hollowing portion of shaft portion Download PDFInfo
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- CN103785699A CN103785699A CN201310499190.1A CN201310499190A CN103785699A CN 103785699 A CN103785699 A CN 103785699A CN 201310499190 A CN201310499190 A CN 201310499190A CN 103785699 A CN103785699 A CN 103785699A
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Abstract
Provided is a method for forming a hollowing portion of a shaft portion. The method does not deform a pulley portion (15). A hollow portion (12) is formed by traversing the internal diameter side of the pulley portion (15) in the shaft portion (11). In the shaft portion (11) of the pulley portion (15) extended towards the outer side of radial direction at the middle position of the length direction, the hollow portion (12) is formed by extrusion processing of a columnar punch (P) and is extended from one end (11a) of the shaft portion (11) to the other end (11b) via the internal diameter side of the pulley portion (15). In the method for forming the hollowing portion (12) of the shaft portion (11), before the front end (Pa) of the punch (P) reaches the internal diameter side of the pulley portion (15), the hollowing portion (12) is formed by forward extrusion processing, and the hollowing portion (12) is formed by forward extrusion processing after the front end (Pa) of the punch (P) reaches the internal diameter side of the pulley portion (15).
Description
Technical field
The present invention relates to there is by extrusion process half-way in the longitudinal direction the method that forms hollow bulb in the axial region of flange part extending to radial outside.
Background technology
The belt wheel of variable v-belt drive possess fixing circular cone plate and and this fixing circular cone plate between form the movable circular cone plate of V-type groove, mobile along rotating shaft direction advance and retreat by movable circular cone plate, thus, the groove width of V-type groove changes.
In fixing circular cone plate, flange shape sheave portion is extended to radial outside from the periphery of the axial region along the extension of rotating shaft direction, in axial region, is formed with oilhole along rotating shaft direction.
At present, this oilhole use drill bit etc. forms by cutting, if but while making the internal diameter of oilhole become large according to the light-weighted requirement of buncher, can produce that operating cost increases because the area of cutting becomes large, and because of problems such as the many yield rate deteriorations of quantitative change of the material of cutting.
Therefore, in order to solve these problems, motion has the reverse extrusion processing by making material plasticity distortion, forms the method (for example, patent documentation 1) of the oilhole of axial region.
Patent documentation 1: TOHKEMY 2003-343672 communique
In patent documentation 1, disclose a kind of one end and other end from the length direction of axial region and squeezed into respectively drift, to form the method for hollow bulb in axial region.
The in the situation that of said method, opposition side (rear side) extruding by from the rubble being squeezed out by drift (remaining meat) to the moving direction of drift, form hollow bulb simultaneously, therefore, if will form hollow bulb in the mode of the internal side diameter that crosses sheave portion, due to the rubble of extruding, the shape of sheave portion can change.
Therefore, need to be from one end of axial region and another distolateral constraint sheave portion, prevent the distortion of sheave portion, therefore, existence can make the problem of the structure large-scale of forging apparatus.
Summary of the invention
So, the invention provides a kind of formation method of hollow bulb of axial region, its method for carrying out more easily,, half-way in the longitudinal direction has in the axial region of flange part, while forming hollow bulb by extrusion molding, can not make flange part distortion, can form hollow bulb in the mode of the internal side diameter that crosses flange part.
The invention provides a kind of formation method of hollow bulb of axial region, half-way in the longitudinal direction has in the axial region of the flange part extending to radial outside, exceed the internal side diameter of described flange part to the hollow bulb of another distolateral extension by using the extrusion process of drift of column to form from one end of this axial region, it is characterized in that, arrive the internal side diameter of described flange part at the front end of described drift before, be processed to form described hollow bulb by forward extrusion (front is given as security and gone out), after arriving the internal side diameter of described flange part, be processed to form described hollow bulb by reverse extrusion (Hou side gives as security and goes out).
According to the present invention, arrive the internal side diameter of flange part at the front end of drift before, by the rubble being pushed by drift forwards side push, form hollow bulb simultaneously, after arriving the internal side diameter of flange, rubble is pushed rearward, form hollow bulb simultaneously.
Therefore, arrive before the internal side diameter of flange part at the front end of drift during, rubble can be to side and rear side move, therefore, rubble can not make to flange part side shifting the shape of flange part become large.
In addition, after the front end of drift arrives the internal side diameter of flange part, if continue forwards side extruding of rubble, the wall of flange part side forwards side by drawing, may there is the fracture of the foundation of flange part etc., but arrive the moment of the internal side diameter of flange part at the front end of drift, rubble is pushed rearward, therefore, the wall of flange part side not forwards layback draw, also can not there is the fracture of the foundation of flange part etc.
Therefore, can not damage significantly the shape of flange part, just can in axial region, form from one end of axial region and exceed the internal side diameter of flange part to the hollow bulb of another distolateral extension.
Accompanying drawing explanation
Fig. 1 is the flow chart of the formation method of the hollow bulb of embodiment;
Fig. 2 (a) and (b) are figure of the formation method of the hollow bulb of explanation embodiment;
Fig. 3 (a) and (b) are figure of the formation method of the hollow bulb of explanation embodiment;
Fig. 4 (a) and (b) are figure of the formation method of the hollow bulb of explanation embodiment;
Fig. 5 (a) and (b) are figure of the formation method of the hollow bulb of explanation embodiment.
Symbol description
11 axial regions
11a one end
The 11b other end
111 base portions
112 large-diameter portions
113 reducing diameter parts
114 central diameter portions
115 reducing diameter parts
116 minor diameter parts
12 hollow bulbs
12a patchhole
15 sheave portion
15a pulley face
15b heavy section
30 knock-pins
30a upper end
50 punch dies
50a work mounting s face
51 hole portions
511 large footpath hole portions
512 undergauge hole portions
513 central diameter hole portions
514 undergauge hole portions
515 diameter holes portions
Lm1 supposes line
P drift
Pa front end
S space
W1 workpiece
W2 workpiece
W3 workpiece
W4 workpiece
Wa interval
X-axis line
The specific embodiment
The formation method of hollow bulb of the present invention being set forth in to the situation that forms hollow bulb in the axial region of movable circular cone plate of the belt wheel that forms automatic transmission below, is that example describes.
Fig. 1 is the flow chart of the formation method of the hollow bulb of embodiment.
Fig. 2 is the figure of the formation method of the hollow bulb of explanation embodiment, and wherein, Fig. 2 (a) is the figure that represents the workpiece W1 of original shape to be positioned in the state of punch die 50, and Fig. 2 (b) is the figure representing according to the forming process of the hollow bulb 12 of forward extrusion.
In addition, in the following, in the time that the moving direction of the rubble to the workpiece being pushed by drift P describes, the moving direction side of drift P (downside in figure) is labeled as to front, the opposition side of moving direction (upside in figure) is labeled as to rear.
As shown in Figure 2, in the formation method of the hollow bulb of embodiment, half-way on length direction at columned axial region 11 is formed with to the workpiece W1 of the flange shape sheave portion 15 of extending to radial outside, use columned drift P to carry out extrusion process, so that the shape of the front of axial region 11 is neat, simultaneously at the interior formation hollow bulb 12 of axial region 11.
Therefore,, forming when hollow bulb 12, after the surface-coated lubricant of workpiece W1 that is processed into original shape, workpiece W1 is arranged on the punch die 50 of the moving direction side (figure downside) that is arranged in drift P (Fig. 1: step S101, with reference to Fig. 2 (a)).
At this, the workpiece W1 of original shape is described.
In workpiece W1, sheave portion 15 is from the periphery of the position of one end 11a near the length direction of axial region 11, along the radially extension of the central axis (being axis X below) of axial region 11, spreads all over the circumferential complete cycle around axis X, forms with same radial height.
The other end 11b side (downside in figure) of sheave portion 15 becomes the pulley face 15a of relative axis X inclination predetermined angular θ, and the internal side diameter of sheave portion 15 becomes and is formed as the heavy section 15b thicker than outside diameter.
One end 11a side of the sheave portion 15 of axial region 11 is the base portion 111 that is formed with the patchhole 12a of drift P.Patchhole 12a has the internal diameter and the cross sectional shape that mate with drift P, with with hollow bulb 12 same inner diameter in axial region 11 interior formation and coaxial mode, axial length L 1 with one end 11a from base portion 111 to the heavy section 15b of the internal side diameter of sheave portion 15, forms along axis X.
The other end 11b side of the sheave portion 15 of axial region 11 is along dividing two gradient undergauges away from the direction of sheave portion 15, the columned large-diameter portion 112 extending from the internal side diameter of sheave portion 15 is via the reducing diameter part 113 along with external diameter diminishes away from sheave portion 15, is connected with columned central diameter portion 114.And, be provided with the reducing diameter part 115 along with the truncated cone shape diminishing away from sheave portion 15 external diameters at the front end of central diameter portion 114.
In addition, punch die 50 has the hole portion 51 of axial region 11 of insertion workpiece W1 and the work mounting s face 50a of the pulley face 15a side of supporting pulley portion 15.
Work mounting s face 50a is same with pulley face 15a, and relatively axis X inclination predetermined angular θ, in the time that workpiece W1 loads in punch die 50, under roughly whole the state contacting with work mounting s face 50a of pulley face 15a and be kept.
In embodiment, hole portion 51, along dividing three gradient undergauges away from the direction of work mounting s face 50a, becomes large footpath hole portion 511, undergauge hole portion 512, central diameter hole portion 513, undergauge hole portion 514, diameter holes portion 515 successively from work mounting s face 50a side.
The upper end 30a of knock-pin 30 and be arranged at Wa spaced apart between the other end 11b of axial region 11 of the workpiece W1 of punch die 50 and arrange, in the starting stage starting before extrusion process, in diameter holes portion 515, guarantee the S that has living space.
Turn back to the explanation of the formation method of hollow bulb 12, after workpiece W1 completes to the setting of punch die 50 (Fig. 1: step S101), after in the patchhole 12a of axial region 11, insertion arranges drift P, make drift P mobile to the other end 11b side (downside in figure) of axial region 11, start to make the extrusion process of the material cold plastic deformation that forms workpiece W1.
At this, owing to being provided with space S between the other end 11b at workpiece W1 and knock-pin 30, therefore, when starting after extrusion process, the rubble of the workpiece W1 being pushed by drift P moves in this space S below knock-pin 30 sides.
Therefore, arriving knock-pin 30(at the rubble of workpiece W1 fills up in space S) before during, process by forward extrusion, make the shape of minor diameter part 116 of axial region 11 neat, simultaneously at the interior formation hollow bulb of axial region 11 12(Fig. 1: step S102, with reference to Fig. 2 (b)).
At this, in embodiment, be pre-formed patchhole 12a at the base portion 111 of axial region 11, carry out from the internal side diameter of the heavy section 15b of sheave portion 15 according to the formation of the hollow bulb 12 of extrusion process.
For example, in the case of base portion 111 be not pre-formed the length of the situation of patchhole 12a and the axis X direction of patchhole 12a shorter, in the time that hollow bulb 12 forms, the wall being pushed by drift P may radially move and make base portion 111 become large deformation.In embodiment, patchhole 12a is with to sheave portion 15(heavy section 15b) the length L 1 of internal side diameter form, the wall being pushed by drift P can radially not move in large quantities, therefore, base portion 111 and neighbouring can earth deformation.
In addition, in the following description, will be formed at the hollow bulb in axial region 11 by drift P, the part of the patchhole 12a that comprises drift P, is used symbol 12, and mark is as hollow bulb 12.
Fig. 3 is the figure of the formation method of the hollow bulb of explanation embodiment, wherein, Fig. 3 (a) represents that drift P arrives the figure of the state of the switching point from forward extrusion processing to reverse extrusion processing, represent to process the workpiece W2 of the intermediate shape obtaining by forward extrusion, Fig. 3 (b) is the figure representing according to the forming process of the hollow bulb 12 of reverse extrusion processing.
Drift P is from the position shown in Fig. 2 (b) is further pressed into the lower side, and workpiece W1 is subject to hindering (Fig. 1: step S103, be, with reference to Fig. 3 (a)) to the movement of the front side (lower side) of rubble because of knock-pin 30.
Then, the rubble being pushed by drift P is (upper side) movement rearward in hole portion 51, is extruded from large footpath hole portion 511.
Therefore,, in the moment shown in this Fig. 3 (a), extrusion process switches to reverse extrusion processing from forward extrusion processing.
At this moment, the basic configuration of footpath hole portion 511 forms general cylindrical shape shape, the moving direction directive property of the rubble pushing greatly.Therefore, the rubble of extruding along axis X (upper side) movement rearward, makes large-diameter portion 112 the extending axially along axis X on workpiece W2 under the state of cross sectional shape that keeps large footpath hole portion 511.
At this, in embodiment, the setting interval Wa of the other end 11b of workpiece W1 in the time of original shape and the upper end 30a of knock-pin 30, so that arrive by the moment in the hypothesis line lm1 of pulley face 15a and the crosspoint of axis X at the front end of drift P, the rubble of the workpiece W1 forwards movement of side is subject to hindering (with reference to Fig. 2 (a)) because of knock-pin 30.
For example, becoming after the workpiece W2 of the intermediate shape shown in Fig. 3 (a), under the state of forward extrusion, the front end Pa of drift P exceedes hypothesis line lm1 and is further forwards pressed into, arrive in the situation of the position shown in wave-like line in figure, in this process, the wall of the heavy section 15b side of sheave portion 15 follow drift P movement and forwards side (downside in figure) by drawing (in figure, with reference to hypothesis line arrow), this is due to fracture and the crackle of foundation that sheave portion 15 may occur.
Therefore, in embodiment, arrive the moment of the internal side diameter of sheave portion 15 at the front end Pa of drift P, switch to reverse extrusion processing from forward extrusion processing, the wall that forms sheave portion 15 can be to the moving direction side of drift P by drawing.
Therefore, during the workpiece W2 that is processed the intermediate shape obtaining by forward extrusion is formed to hollow bulb 12 by reverse extrusion, the rubble being pushed by drift P pushes (Fig. 3 (b) rearward, reference arrow), therefore, the shape of sheave portion 15 can not be damaged, and large-diameter portion 112 is extended rearward.
Fig. 4 is the figure of the formation method of the hollow bulb of explanation embodiment, wherein, Fig. 4 (a) is the figure that explanation drift P arrives the state of the switching point from reverse extrusion processing to forward extrusion processing, represent to process the workpiece W3 of the intermediate shape obtaining by reverse extrusion, Fig. 4 (b) is the figure that is expressed as the state that carries out forward extrusion processing and knock-pin 30 is unloaded from punch die.
From the state shown in Fig. 3 (b), when continue according to the hollow bulb 12 of reverse extrusion processing formation time, the front end Pa of drift P arrives the internal side diameter (Fig. 1: step S105, be, with reference to Fig. 4 (a)) of reducing diameter part 113.
Then,, in this moment, unload knock-pin 30(with reference to Fig. 4 (b)).Thus, the rubble being pushed by drift P forwards side (downside in figure) is mobile, and therefore, extrusion process switches to forward extrusion processing (Fig. 1: step S106, with reference to Fig. 4 (a) and (b)) from reverse extrusion processing.
For example, becoming after the workpiece W3 of the intermediate shape shown in Fig. 4 (a), under the state of reverse extrusion, the front end Pa of drift P is pressed into the below of reducing diameter part 113, arrive in the situation before the position of the internal side diameter of the central diameter portion 114 shown in wave-like line in figure, in this process, the wall in the central diameter portion 114 of the front side of drift P by and central diameter hole portion 513 between gap △ W(difference in height), (upside in figure) is by drawing (in figure, with reference to hypothesis line arrow) rearward.
At this, central diameter portion 114 is the path less than large-diameter portion 112, thereby the amount of wall that can be mobile is rearward subject to the restriction of large-diameter portion 112 sides, therefore, along with the forwards movement of side of drift P, the wall of central diameter portion 114 sides is to large-diameter portion 112 sides during by drawing, and because of the deficiency of wall movably, crackle may occur the part of reducing diameter part 113.
Therefore, in embodiment, be arranged in any time (figure during the internal side diameter of reducing diameter part 113 at the front end Pa of drift P, optional position in scope shown in △ L), by unloading knock-pin 30, switch to forward extrusion processing from reverse extrusion processing, thereby do not make the wall of central diameter portion 114 sides move to the rear of large-diameter portion 112 sides, and make wall in central diameter portion 114 forwards side be extruded, reduced the possibility that crackle occurs.
In addition, as long as the switching of processing from reverse extrusion processing to forward extrusion is the front end Pa of drift P in the drawings in the scope shown in △ L, but the moment of the cardinal extremity of large-diameter portion 112 sides of the front end Pa being preferably at drift P arrival reducing diameter part 113 carries out.This is due to along with approaching central diameter portion 114 sides, and the quantitative change of (upside in figure) mobile wall is few rearward.
Fig. 5 is the figure of the formation method of the hollow bulb of explanation embodiment, wherein, Fig. 5 (a) represents that drift P arrives the figure that completes state a little according to the formation of the hollow bulb 12 of forward extrusion processing, represent to process according to forward extrusion the workpiece W4 of the net shape obtaining, Fig. 5 (b) is the figure that the workpiece W4 of explanation net shape unloads from punch die 50.
When drift P is further pressed in to the lower side from the state shown in Fig. 4 (b), drift P is forwards side (downside in figure) extruding of rubble, and the minor diameter part 116 that makes workpiece W4 extends axially along axis X, simultaneously at the interior formation hollow bulb 12 of axial region 11.
And, (for example reach the specific length predetermined when be processed to form the length of the hollow bulb 12 in axial region 11 by this forward extrusion, length in figure shown in L2) time (Fig. 1: step S107, be, with reference to Fig. 5 (a)), complete the movement to lower direction in figure of drift P, complete according to the formation (Fig. 1: step S108) of the hollow bulb 12 of forward extrusion processing.
In embodiment, before the front end Pa of drift P will arrive the internal side diameter of reducing diameter part 115, complete according to the formation of the hollow bulb 12 of forward extrusion processing.If this is the formation of carrying out hollow bulb 12 due to the front end Pa at drift P to the position of the internal side diameter of large reducing diameter part 115, the reducing diameter part 115 forming after hollow bulb 12 can become thin.
Complete after forward extrusion processing, as shown in Fig. 5 (b), by drift P from the workpiece W4 of net shape extracts, by by knock-pin 30 51(of patchhole portion diameter holes portions 515) in upwards to push away workpiece W4, thus, workpiece W4 is unloaded from punch die 50.
As mentioned above, during in the extrusion process by using columned drift P and at the interior formation hollow bulb 12 of axial region 11, the direction of extrusion of the rubble being pushed by drift P by suitable switching, can there is not the fracture of the distortion of sheave portion 15 and the foundation of sheave portion 15 etc., can form hollow bulb 12 in the mode of the internal side diameter that crosses sheave portion 15.Therefore, do not need the axial both sides constraint sheave portion 15 from axis X as the situation of the formation method of conventional example, only prepare the punch die 50 of a side of constraint sheave portion 15, therefore, can not make forging apparatus maximize, can make the formation of hollow bulb carry out more easily.
As previously discussed, in embodiment, a kind of formation method of hollow bulb 12 of axial region 11 is provided, half-way in the longitudinal direction have to radial outside extend sheave portion 15(flange part) axial region 11 in, exceed by using the extrusion process of drift P of column to form from one end 11a of this axial region 11 hollow bulb 12 that the internal side diameter of sheave portion 15 extends to other end 11b side, wherein, before the front end Pa of drift P arrives the internal side diameter of sheave portion 15, be processed to form hollow bulb 12 by forward extrusion, after arriving the internal side diameter of sheave portion 15, be processed to form hollow bulb 12 by reverse extrusion.
If form like this, before the front end Pa of drift P arrives the internal side diameter of sheave portion 15, the forwards side extruding of the rubble of the workpiece W1 of original shape is formed to hollow bulb 12 simultaneously, after arriving the internal side diameter of sheave portion 15, the rubble of the workpiece W2 of intermediate shape is pushed rearward and forms hollow bulb 12 simultaneously.
Therefore, arrive before the internal side diameter of sheave portion 15 at the front end Pa of drift P during, rubble does not move to radial outside and the rear side of the moving direction of drift P, and therefore, rubble can be to sheave portion 15 side shiftings and the shape of sheave portion 15 can not become large.
In addition, reach after the internal side diameter of sheave portion 15 at the front end Pa of drift P, if continue the forwards extruding of side of rubble, the wall of sheave portion 15 sides forwards side by drawing, sheave portion 15 is likely out of shape, likely there is fracture and crackle in the foundation of sheave portion 15, but arrive the moment of the internal side diameter of sheave portion 15 at the front end Pa of drift P, push rearward rubble, therefore, the wall of sheave portion 15 sides not forwards layback draw and the shape of sheave portion 15 can not become greatly, can there is not fracture and crackle in the foundation of sheave portion 15 yet.
Therefore, can not damage significantly the shape of sheave portion 15 etc., and exceed the internal side diameter of sheave portion 15 from one end 11a of axial region 11 in the interior formation of axial region 11 to the hollow bulb 12 of other end 11b side extension.
Particularly, by making the reverse extrusion processing of material plasticity distortion, become the hollow bulb 12 of oil circuit in the interior formation of axial region 11, therefore, can, as formed the situation of hollow bulb in machining, not produce the processing problem of cutting chip.In addition, even if make the internal diameter of hollow bulb become large, can not be created in yet problem in the situation that forms hollow bulb in machining, operating cost increases, the yield rate deterioration of material etc. because the amount of discarded material increases.
At axial region 11, the external diameter that is provided with axial region 11 in the other end 11b of sheave portion 15 side is along with the reducing diameter part 113 diminishing away from sheave portion 15,
Arrive and moment on the border of reducing diameter part 113 at the front end Pa of drift P, the formation of hollow bulb 12 becomes the formation method that switches to the hollow bulb 12 axial region 11 of formation of forward extrusion processing from reverse extrusion processing.
If the front end Pa of drift P arrives after reducing diameter part 113, when continuing rubble and pushing rearward, from reducing diameter part 113 central diameter portion 114 sides above, movably the quantitative change of wall is few, and therefore, crackle etc. may occur reducing diameter part 113.
Form as described above, arrive the moment of reducing diameter part 113 in the front end Pa of drift P side, can not make the wall of central diameter portion 114 sides move to the rear of large-diameter portion 112 sides, but by by forwards side extruding of the wall in central diameter portion 114, can reduce the possibility that reducing diameter part 113 cracks.
In addition, because the loading applying to drift the reverse extrusion in the situation that is than large in the situation of forward extrusion, therefore, in the situation that only forming hollow bulb by existing reverse extrusion, if the length of the hollow bulb forming in axial region is elongated, correspondingly, the length of drift is elongated, therefore, drift may fracture.
In embodiment, in the time that the extrusion process by using drift P forms hollow bulb, by the order of forward extrusion, reverse extrusion, forward extrusion, change the direction of extrusion of the rubble being pushed by drift P, combination reverse extrusion and forward extrusion form hollow bulb 12.Therefore, the entirety by extrusion process can the loading of reducing effect on drift, and therefore, the durability of drift improves.
In addition, a kind of formation method of hollow bulb of axial region is provided,, to thering is axial region 11 and the half-way on the length direction of the above-mentioned axial region 11 workpiece W1 to the original shape of the flange shape sheave portion 15 of radial outside extension, carry out according to the extrusion process of the cold plastic deformation of the columned drift P of use, make the shape of above-mentioned axial region 11 neat, exceed the internal side diameter of above-mentioned sheave portion 15 from its one end to the hollow bulb 12 of another distolateral extension in the interior formation of above-mentioned axial region 11, said method comprises the steps: simultaneously
(A) be made as following state: the workpiece W1 that above-mentioned original shape is set on the punch die 50 of work mounting s face 50a with the hole portion 51 of shape corresponding with the shape of the axial region 11 of the workpiece W4 of net shape and the pulley face 15a of the above-mentioned sheave portion 15 of supporting, the other end 11b side of above-mentioned axial region 11 is inserted in above-mentioned hole portion 51, made above-mentioned pulley face 15a be bearing in work mounting s face 50a;
(B) insert and arrange after drift P at the patchhole 12a of one end 11a opening of the axial region 11 of the workpiece W1 of original shape, make the other end 11b side shifting of drift P to axial region 11, until (a) the front end Pa of drift P arrives the internal side diameter of sheave portion 15, and (b) by the movement of the rubble of forwards side extruding of drift P because of till inserting knock-pin 30 in above-mentioned hole portion 51 and being hindered, process at the interior formation hollow bulb 12 of above-mentioned axial region 11, as the workpiece W2 of intermediate shape by forward extrusion;
(C) in the workpiece W2 of above-mentioned intermediate shape, make the further other end 11b side shifting of above-mentioned drift P to axial region 11, until the front end Pa of above-mentioned drift P arrives and the border of the reducing diameter part 113 of the axial region 11 of workpiece W2, process at the interior formation hollow bulb 12 of above-mentioned axial region 11, as the workpiece W3 of intermediate shape by reverse extrusion;
(D) by above-mentioned knock-pin 30 from above-mentioned hole portion 51 is unloaded, at the workpiece W3 of above-mentioned intermediate shape, by make above-mentioned drift P further to the other end 11b side shifting of axial region 11 to carry out forward extrusion processing, thus, make the shape of above-mentioned axial region 11 neat simultaneously at the interior formation hollow bulb 12 of above-mentioned axial region 11, as the workpiece W4 of net shape.
If form like this, in the time forming hollow bulb 12, the wall of formation sheave portion 15 is by the drift P in axial region 11 interior movements by drawing, and sheave portion 15 can not be out of shape, therefore, do not need as the situation of the formation method of conventional example, from the axial both sides constraint sheave portion 15 of axis X, only prepare the punch die 50 of a side of constraint sheave portion 15, therefore, can not make forging apparatus maximize, and can make the formation of hollow bulb carry out more easily.
In embodiment, the axial region of movable circular cone plate exemplified with the belt wheel forming automatic transmission forms the situation of hollow bulb, but as long as half-way is in the longitudinal direction provided with in the spindle unit of the flange radially extending, the situation that forms hollow bulb to cross the mode of internal side diameter of flange, just can suitably be suitable for method of the present invention.Therefore, be not only the movable circular cone plate of belt wheel, form the situation of hollow bulb at the axial region of reduction gearing etc., also can suitably utilize the present invention.
Claims (2)
1. the formation method of the hollow bulb of an axial region, half-way in the longitudinal direction has in the axial region of the flange part extending to radial outside, exceed the internal side diameter of described flange part to the hollow bulb of another distolateral extension by using the extrusion process of drift of column to form from one end of this axial region, it is characterized in that
Arrive the internal side diameter of described flange part at the front end of described drift before, be processed to form described hollow bulb by forward extrusion, after arriving the internal side diameter of described flange part, be processed to form described hollow bulb by reverse extrusion.
2. the formation method of the hollow bulb of axial region as claimed in claim 1, is characterized in that,
At described axial region, at described another distolateral external diameter that is provided with described axial region of described flange part along with the reducing diameter part diminishing away from described flange part,
In the front end arrival of described drift and the moment on the border of reducing diameter part, the formation of described hollow bulb switches to described forward extrusion processing from described reverse extrusion processing.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012-239304 | 2012-10-30 | ||
| JP2012239304A JP5713982B2 (en) | 2012-10-30 | 2012-10-30 | Method for forming hollow portion in shaft portion |
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| Publication Number | Publication Date |
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| CN103785699A true CN103785699A (en) | 2014-05-14 |
| CN103785699B CN103785699B (en) | 2017-02-22 |
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| CN201310499190.1A Active CN103785699B (en) | 2012-10-30 | 2013-10-22 | Method for forming hollowing portion of shaft portion |
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| JP (1) | JP5713982B2 (en) |
| CN (1) | CN103785699B (en) |
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| CN102172656A (en) * | 2010-12-10 | 2011-09-07 | 深圳航空标准件有限公司 | Resonance rod cold heading manufacturing method |
| CN102513791A (en) * | 2011-12-27 | 2012-06-27 | 十堰园钧工贸有限公司 | Technical method for forming semi-axle housing tube for large-diameter flange |
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| CN102172656A (en) * | 2010-12-10 | 2011-09-07 | 深圳航空标准件有限公司 | Resonance rod cold heading manufacturing method |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP5713982B2 (en) | 2015-05-07 |
| JP2014087827A (en) | 2014-05-15 |
| CN103785699B (en) | 2017-02-22 |
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