CN1886212A - Method of manufacturing outer ring member for constant velocity joint - Google Patents
Method of manufacturing outer ring member for constant velocity joint Download PDFInfo
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- CN1886212A CN1886212A CN 200480035059 CN200480035059A CN1886212A CN 1886212 A CN1886212 A CN 1886212A CN 200480035059 CN200480035059 CN 200480035059 CN 200480035059 A CN200480035059 A CN 200480035059A CN 1886212 A CN1886212 A CN 1886212A
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Abstract
A method of manufacturing an outer ring member for a constant velocity joint, comprising the steps of forming a secondary molding (20) by applying a preliminary upsetting to a work (10) after applying a forward extrusion-molding (S1) to the work (10) (S2), forming intermediate pre-molded bodies (24, 24a) having annular sloped surfaces (36, 36a) formed thereon to have a difference in flow resistance between large diameter parts (28a to 28c) and small diameter parts (30a to 30c) by applying the upsetting to the upper part (22) of the secondary molding (20) (S3, S3a), forming a quaternary molding (58) having a cup part (62) with track grooves (60a to 60c) by applying a backward extrusion-molding to the intermediate pre-molded bodies (24, 24a)(S4), and applying an ironing to the cup part (62) of the quaternary molding (58) to finish the quaternary molding (58) to product dimensions (S5).
Description
Technical field
The present invention relates to a kind of manufacture method of outer ring member of the CV joint that is used to transmit rotary driving force.
Background technology
Up to now, custom be to fill the chamber that forms by the upper die and lower die that are engaged with each other with forged material, and apply press power to forged material, thereby generate the outer ring member (outer cup) of the CV joint that for example is used to drive automotive wheels by drift.
Outer ring member comprises tubulose cup and the bar portion (shank) integrally formed with this glass.This cup is limited with three axially extended rail grooves (track groove) in the perimeter surface within it, and roller can roll in rail groove and along rail groove.
Manufacture method for the outer ring member that is used for CV joint of the above-mentioned type, for example Japanese kokai publication sho 57-206537 communique discloses a kind of technological thought that solves following problem, promptly, when squeezing when drawing the cup-shaped exterior part blank that has with the wall thickness of product size basically identical size, extend significantly vertically than the major diameter part, and smaller diameter portion is extended vertically lessly.According to disclosed technological thought, extend axially the size that keeps substantially invariable constant volume rule to set cup-shaped exterior part blank according to making.
Japanese kokai publication sho 61-3618 communique discloses a kind of like this technological thought, be used for forming cup-shaped semifinished product with bar portion according to forging process, this semifinished product has and finishes the essentially identical inner surface configuration of shape, on the inner surface of semifinished product, internal mold is set then, and evenly than thickness portion, even thin part and to the part that thin part is extended, squeezing the whole circumference of drawing outer surface towards inner surface evenly to squeeze the rate of drawing than thickness portion, thereby go out a plurality of grooves with high accuracy fine finishining in inner surface.
Yet, according to disclosed technological thought in Japanese kokai publication sho 57-206537 communique, because crowded rate a great difference each other of drawing of bottom, rail groove and the inner surface of rail groove, therefore with evenly to squeeze the situation of drawing rate to squeeze the bottom, rail groove and the inner surface that draw rail groove compare, the precision of the rooved face of rail groove is lower.
According to disclosed technological thought in Japanese kokai publication sho 61-3618 communique, its precondition be to use have bar portion, inner surface configuration and finish the essentially identical cup-shaped semifinished product of shape as forging blank (workpiece).If to the workpiece of blank form in the middle of cup-shaped carry out disclosed manufacture process in the Japanese kokai publication sho 61-3618 communique (this workpiece be make by the backward extrusion billet and to have wall thickness between than major diameter part and smaller diameter portion poor), then because the different crowded rates of drawing makes the thin thickness portion that partly compares extend vertically biglyyer.Even squeeze pulling shaft blank in the middle of end face is irregular circumferentially to squeeze the rate of drawing uniformly, the end face that generates after squeezing the throwing material still keeps irregular, and has increased the fine finishining workload on the axial end.
Summary of the invention
The problem that the present invention is to be solved
Cardinal principle purpose of the present invention provides a kind of manufacture method that is used for the outer ring member of CV joint, when the reverse extruding forging blank, by making and in the smaller diameter portion of forging blank, comparing, in than the major diameter part, there is more substantial forged material to flow, and makes described outer ring member have the basic axial end uniformly of size to improve machining accuracy.
Another object of the present invention provides a kind of manufacture method that is used for the outer ring member of CV joint, by the process that forms the middle preliminarily forming body with annular slope is provided, this annular slope has even inclination angle between than major diameter part and smaller diameter portion, and make described outer ring member have the basic axial end uniformly of size, thereby when the reverse extruding forging blank, improved machining accuracy.
According to the present invention, middle formed body is shaped so that with described smaller diameter portion and compares, and more materials are easy to flow in than the major diameter part described.Therefore, in the middle of the backward extrusion during formed body, make the axial dimension basic homogenising of cup at described end face than major diameter part and described smaller diameter portion office.
The result, prevented from localized by material by four drip moldings that backward extrusion generates, and compare with smaller diameter portion, than major diameter partly make himself material well plasticity flow, thereby reduced allowance for finish and reduced cutwork amount as the fine finishining workload.
In addition, according to the present invention, the process that is formed for the outer ring member of CV joint by a plurality of cold forging steps comprises: form the step of the middle preliminarily forming body with annular slope, this annular slope has constant inclination angle along it than major diameter part and smaller diameter portion.When the preliminarily forming body of the described centre of backward extrusion in next step, the plastic deformation material is easy to along described annular slope from described smaller diameter portion to flow towards described the branch than large-diameter portion, thus described than the major diameter part in than described smaller diameter portion in material flow better.If described annular slope is bigger at the area of described smaller diameter portion than described annular slope at described area than the large-diameter portion office, then with in the described smaller diameter portion compare, have more material described than flowing in the major diameter part.
Description of drawings
Fig. 1 is the flow chart of manufacture process that is used for the outer ring member of CV joint according to the embodiment of the invention;
Fig. 2 is side view and the plane that is the workpiece of the cylindrical form that is cut into predetermined length;
Fig. 3 is the side view and the plane of the once-forming body that generates when the forward extrusion workpiece;
Fig. 4 is the side view and the plane of the secondary forming body that generates when preliminary upsetting once-forming body;
Fig. 5 is the side view and the plane of the middle preliminarily forming body that generates when upsetting secondary forming body;
Fig. 6 is the side view and the plane of four formed bodies generating when backward extrusion middle preliminarily forming body shown in Figure 5;
Fig. 7 squeeze generate when drawing four formed bodies, as the side view and the plane that are used for the outer ring member finished product of tripod constant velocity joint;
Fig. 8 is the vertical sectional view that is used to form the 3rd forging die of middle preliminarily forming body shown in Figure 5, has omitted some parts from view;
Fig. 9 is the partial cut-out side view and the upward view of the drift of the 3rd forging die shown in Figure 8;
Figure 10 is the stereogram of middle preliminarily forming body shown in Figure 5;
Figure 11 is used for carrying out anti-vertical sectional view of forging the 4th forging die of (backward forging) on middle preliminarily forming body, has omitted some parts from view;
The chart of Figure 12 result of the test that to be expression provide when the angle of inclination beta change of and smaller diameter portion constant than the inclination alpha of major diameter part;
Figure 13 is the flow chart of manufacture process that is used for the outer ring member of CV joint according to another embodiment of the present invention;
Figure 14 is the side view and the plane of the middle preliminarily forming body that generates when the process upsetting secondary forming body at the outer ring member that is used for CV joint according to this another embodiment manufacturing;
Figure 15 is the stereogram of middle preliminarily forming body shown in Figure 14;
Figure 16 is the vertical sectional view that is used to form the 3rd forging die of middle preliminarily forming body shown in Figure 14, has omitted some parts from view; And
Figure 17 is the partial cut-out side view and the upward view of the drift of the 3rd forging die shown in Figure 16.
The specific embodiment
In Fig. 1, demonstrate the manufacture process that is used for the outer ring member of CV joint according to the embodiment of the invention.Shown in the flow chart of Fig. 1, will be workpiece 10 cold forgings totally five times of carbon steel system cylindrical form, be used for the outer ring member of tripod constant velocity joint with final manufacturing.
In Fig. 2 to Fig. 7, demonstrate the mode that changes the shape of workpiece 10 by manufacture process.
In first preparation process, handle the workpiece 10 (referring to Fig. 2) that is cut into cylindrical form by spheroidizing with predetermined length.Make workpiece 10 softening, thereby in first to the 5th cold forging step described below, be easy to handle.
In second preparation process, workpiece 10 is applied the lubrication chemistry film.Particularly, handle the lubrication chemistry film of formation trbasic zinc phosphate on the surface of workpiece 10 so that surface lubrication by phosphatization.Can reach predetermined amount of time in the solvent that wherein is dissolved with trbasic zinc phosphate etc. and form this lubrication chemistry film by workpiece 10 is immersed.
Then, in the first cold forging step S1, forward extrusion is coated with the workpiece 10 of lubrication chemistry film.Particularly, the bar portion that has that workpiece 10 is loaded in first forging die forms in the workpiece retainer of chamber (not shown).Bar portion forms the diameter of chamber less than workpiece 10, forms between chamber and the workpiece retainer in bar portion and is provided with the conical surface.
Then, form the end face of chamber pressure workpiece 10 towards bar portion.The other end part ramming stem portion of workpiece 10 is formed in the chamber, and generating once-forming spare (once-forming body) 16 (referring to Fig. 3), it comprises that in the part of described other end the reduced diameter portion of taper divides 12 and bar portion 14.Because the part that is carried in the workpiece retainer of workpiece 10 does not have plastic deformation basically, so once-forming spare 16 has the corresponding top 18 of diameter of diameter and workpiece 10.
Then, in the second cold forging step S2, preliminary upsetting once-forming spare 16.Particularly, once-forming spare 16 is loaded in the chamber in unshowned second forging die.At this moment, in the bar portion retainer that bar portion 14 is inserted in second forging die.
The end of the bar portion 14 in the insertion rod portion retainer is supported by unshowned stop component, and the top 18 by drift compacting and extrusion once-forming spare 16.In extrusion during top 18, with top 18 boil down tos than major diameter, to generate secondary forming spare (secondary forming body) 20 (referring to Fig. 4).
Then, in the 3rd cold forging step S3, further upsetting secondary forming spare 20 to be being compressed into its top 22 than major diameter, thereby forms the middle preliminarily forming body 24 (referring to Fig. 5 and Figure 10) as three drip moldings.
Particularly, secondary forming spare 20 is loaded in the chamber 27 in the 3rd forging die shown in Figure 8 (preliminarily forming mould) 25, and, thereby, top 22 generates middle preliminarily forming body 24 (three drip moldings) under compression by axially being out of shape by the top 22 of drift 29 compacting secondary forming spares 20.
As shown in Figure 9, drift 29 has recessed a little circular middle section and is recessed into the annular slope formation part 31 that regional peripheral edge outward radially outward raises from this circle on its terminal surface.The inclined-plane forms part 31 and has circumferential ramps, and its inclination angle changes continuously in the mode corresponding to following first inclined-plane that will describe and second inclined-plane.
As Fig. 5 and shown in Figure 10, middle preliminarily forming body 24 comprises: plate-like head 26, and its top 22 than secondary forming part 20 is thinner and diameter is bigger; And the bar portion 14 that reduces of diameter, it is 26 bottom one definite length extended vertically from the head.
As shown in the plane, head 26 has: three flaps are than major diameter part 28a to 28c, and they radially outward stretch out predetermined length and along circumferentially spaced apart angledly with about 120 degree; And three bendings and recessed smaller diameter portion 30a to 30c, each all is arranged in adjacent than between the major diameter part 28a to 28c.
Particularly, annular slope 36 comprises three with the central authorities (axis C) and first inclination facet (facet) 38a to 38c than the central interconnection of major diameter part 28a to 28c, and the first inclination facet 38a to 38c with respect to the horizontal plane has the inclination alpha of about 3 degree.Annular slope 36 also comprises three with the second inclination facet 40a to 40c of central authorities (axis C) with the central interconnection of smaller diameter portion 30a to 30c, and the second inclination facet 40a to 40c with respect to the horizontal plane has the angle of inclination beta of about 10 degree.Between than the first inclination facet 38a to 38c of the centre of major diameter part 28a to 28c and the second inclination facet 40a to 40c in the centre of smaller diameter portion 30a to 30c, the inclination angle from the first inclination facet 38a to 38c (or second inclination facet 40a to 40c) towards the second inclination facet 40a to 40c (or first inclination facet 38a to 38c) along circumferentially changing (increase and reduce) continuously.
In other words, on the circumferential continually varying annular slope 36 in inclination angle (with respect to the horizontal plane) edge, the inclination alpha than the centre of major diameter part 28a to 28c that will link to each other with central authorities (axis C) is set at minimum of a value, and the angle of inclination beta of the centre of the smaller diameter portion 30a to 30c that will link to each other with central authorities (axis C) is set at maximum.
Than the inclination alpha of the centre of major diameter part 28a to 28c be not limited to be respectively as mentioned above 3 degree and 10 in the angle of inclination beta of the centre of smaller diameter portion 30a to 30c and spend, and can be set at such value, that is, angle of inclination beta is greater than inclination alpha (α＜β) and spending in the scopes of 12 degree from 3 than the differential seat angle between the angle of inclination beta of the inclination alpha of major diameter part 28a to 28c and smaller diameter portion 30a to 30c.This is because make the angle of inclination beta of smaller diameter portion 30a to 30c with less material flow resistance greater than the inclination alpha than major diameter part 28a to 28c with big material flow resistance, and is poor so that suitable material flow resistance to be provided between than major diameter part 28a to 28c and smaller diameter portion 30a to 30c.
Figure 12 illustrates when the steady state values that will be made as 3 degree than the inclination alpha of major diameter part 28a to 28c, and the result of the test that produces when changing than the differential seat angle between the angle of inclination beta of the inclination alpha of major diameter part 28a to 28c and smaller diameter portion 30a to 30c.
According to described result of the test, when being zero degree than the differential seat angle between the angle of inclination beta of the inclination alpha of major diameter part 28a to 28c and smaller diameter portion 30a to 30c, forge in step at next and can have problems when workpiece put into mould, and described differential seat angle is unsuitable for producing in batches.When the differential seat angle between inclination alpha and the angle of inclination beta is 15 when spending, will can suffer material crack than the stage portion that major diameter part 28a to 28c engages with smaller diameter portion 30a to 30c.
Therefore as can be seen, should 3 values of spending in the 12 degree scopes will be set at than the differential seat angle between the angle of inclination beta of the inclination alpha of major diameter part 28a to 28c and smaller diameter portion 30a to 30c from result of the test shown in Figure 12.
As shown in Figure 5, the radial width of annular slope 36 is in the centre maximum than major diameter part 28a to 28c, and in the centre minimum of smaller diameter portion 30a to 30c.
The vertical cross-section of once-forming spare 16 and secondary forming spare 20 is with respect to its axis A, B symmetry (axially symmetry) (referring to Fig. 3 and Fig. 4) separately.Yet, as the vertical cross-section of the middle preliminarily forming body 24 of three drip moldings with respect to axis C also asymmetric (referring to Fig. 5).
So far, have the cup that outer surface is a cylindricality as the finished product of the outer ring member that is used for CV joint, this glass indent is in order to remove material, to satisfy the requirement that alleviates outer ring member weight.The vertical cross-section of the cup of indent is asymmetric with respect to its axis.
After finishing the 3rd cold forging step S3,24 annealing of preliminarily forming body are to remove destressing from it in the middle of making at low temperatures, by shot-peening handle through annealing middle preliminarily forming body 24, removing the oxidation scales of skin that peel off that produces because of process annealing etc., and handle the lubrication chemistry film that on the outer surface of middle preliminarily forming body 24, forms trbasic zinc phosphate etc. by phosphatization.Carry out these processing by going up, can easily make its plastic deformation at middle preliminarily forming body 24 (three drip moldings).
Afterwards, use the 4th forging die 42 shown in Figure 11 to carry out the 4th cold forging step S4.
The 4th forging die 42 has patrix 44 and counterdie 46, they by assembling thereon the insertion parts (not shown) and each other one engage.Counterdie 46 has bar portion patchhole 48, for the bar portion 14 of preliminarily forming body 24 (three drip moldings) in the middle of inserting therein.In the positive vertical lower of bar portion patchhole 48, being furnished with can be by through hole lifting or the knockout pin 50 that descends.Patrix 44 is limited with cup-shaped one-tenth chamber 52 in the wall within it.
The guide pin bushing 56 that will be the hollow metal cylindrical form is enclosed within on the drift 54, promotes smoothly or reduces drift 54 with the guide surface along patrix 44.
Drift 54 has three ridge (not shown), and their are along circumferentially spaced apart angledly and along the axis definite length extended of drift 54 with 120 degree.Described ridge produces rail groove 60a to 60c in the inner wall surface of the cup 8 of four drip moldings 58, as shown in Figure 6.Among the 5th cold forging step S5 that will describe in the back, squeeze and to draw described cup 62 rail groove 60a to 60c is processed into rail groove 60a to 60c (referring to Fig. 7) with the shape and size precision that has improved.
Can promote or reduction drift 54 by unshowned press.Press comprises pressure head (ram), and being equipped with on this pressure head can be with the moved both vertically parts (not shown) of this pressure head vertical movement.Drift 54 is fixed on these parts that can move both vertically by anchor clamps.
Go up and carry out the 4th cold forging step, i.e. backward extrusion at middle preliminarily forming body 24 (three drip moldings) (in the bar portion patchhole 48 that its bar portion 14 inserts in the 4th forging die 42) as follows.
When with the bar portion 14 of middle preliminarily forming body 24 when bar portion patchhole 48 is loaded in the counterdie 46, be provided with and have preset width (for example 0.2 in the 0.3mm scope) and circumferential uniform gap uniformly between the outer wall surface of the wall surface of the cup-shaped one-tenth chamber 52 in the inwall that is defined in patrix 44 and middle preliminarily forming body 24 (comprising) than major diameter part 28a to 28c and smaller diameter portion 30a to 30c.
At first, activate moved both vertically parts on press is bonded on this press with reduction the pressure head.The drift 54 and the parts that can move both vertically are reduced explicitly, with upper surface against the head 26 of middle preliminarily forming body (three drip moldings) 24.
Drift 54 is further reduced to push the head 26 of middle preliminarily forming body 24, so that head 26 plastic deformations.At this moment, flowing along such direction (upward to) plasticity of middle preliminarily forming body 24 than major diameter part 28a to 28c and smaller diameter portion 30a to 30c, this direction is opposite with the direction that outer surface along drift 54 descends drift 54, is subjected to the cup-shaped inner wall surface restriction that becomes chamber 52 and flow than the plasticity of major diameter part 28a to 28c and smaller diameter portion 30a to 30c.
Owing to extended by plasticity is mobile than major diameter part 28a to 28c, so the ridge of drift 54 forms on the inner wall surface of cup 62 along the rail groove 60a to 60c of the axial orientation of middle preliminarily forming body (three drip moldings) 24.
Afterwards, activate press to promote drift 54 explicitly with the pressure head and the parts that can move both vertically.Knockout pin 50 is raise so that four drip moldings 58 shown in Figure 6 expose.
Usually, for example when reverse extruding forging blank (workpiece), compare with smaller diameter portion, less than the anti-prolongation amount (stream of plastic momentum) in the major diameter part, the different deformation drag (ductility) owing to forging blank is tending towards causing crackle, material localization etc. like this.
According to current embodiment, the annular slope 36 of preliminarily forming body 24 than the inclination alpha of major diameter part 28a to 28c angle of inclination beta, between than major diameter part 28a to 28c and smaller diameter portion 30a to 30c, to provide the material flow resistance poor in the middle of making less than smaller diameter portion 30a to 30c.Poor based on described material flow resistance, when the preliminarily forming body 24 of backward extrusion centre, make the plastic flow momentum than major diameter part 28a to 28c and smaller diameter portion 30a to 30c differ from one another, material flows better among the smaller diameter parts 30a to 30c to allow in than major diameter part 28a to 28c.
Therefore, according to current embodiment, because middle preliminarily forming body 24 is shaped so that material is easier to flow in than major diameter part 28a to 28c than in smaller diameter portion 30a to 30c, thereby in the middle of the backward extrusion during preliminarily forming body 24, cup 62 is in the basic homogenising of axial dimension than the end face at major diameter part 28a to 28c and smaller diameter portion 30a to 30c place.
The result, according to current embodiment, prevented from localized by material by four drip moldings 58 that backward extrusion generates, and than major diameter part 28a to 28c make himself material well plasticity flow, thereby reduced fine finishining workload (cutwork amount) in later step.
According to current embodiment, as mentioned above, before being used to carry out the 4th cold forging step S4 of backward extrusion, preliminarily forming body 24 (three drip moldings) in the middle of forming, thereby the precision of the finished product that increase will form in later step and the fine finishining workload of minimizing in later step.
After executed the 4th cold forging step S4, on four drip moldings 58, carry out the 5th cold forging step S5.Before carrying out the 5th cold forging step S5, can be on any one surface of four drip moldings 58 and the 5th forging die (not shown) the applying liquid lubricant, to avoid when carrying out the 5th cold forging step S5 seizure on four drip moldings 58 or the 5th forging die.Fluid lubricant can be the known fluid lubricant that uses before this.
In the 5th cold forging step S5, use unshowned the 5th forging die on the surfaces externally and internally of four drip moldings 58, to squeeze to draw (last sizing), thereby be finished form cup 62 fine finishining.Particularly, four drip moldings 58 are processed into make the wall thickness of cup 62 and the width and the degree of depth of rail groove 60a to 60c have given dimensional accuracy, thereby generate the outer ring member that is used for the tripod constant velocity joint (referring to Fig. 7) as finished product 64, wherein cup 62 (comprise rail groove 60a to 60c etc. shape) has required dimensional accuracy.
For manufacture process according to current embodiment, before the backward extrusion in the 4th cold forging step S4, formation has the middle preliminarily forming body 24 of annular slope 36, this annular slope provides the material flow resistance poor between than major diameter part 28a to 28c and smaller diameter portion 30a to 30c, to increase the product precision and the quality stability of finished product 64.
Figure 13 represents to be used for according to another embodiment of the present invention the manufacture process of the outer ring member of CV joint.The parts identical with last embodiment according to this another embodiment represent with identical Reference numeral, below and be not described in detail.Shown in the flow chart as shown in figure 13, the manufacture process that is used for the outer ring member of CV joint according to this another embodiment only is with difference according to the manufacture process of embodiment shown in Figure 1, be used to form the 3rd cold forging step S3a, and other step except the 3rd cold forging step S3a and last embodiment's is identical as the middle preliminarily forming body 24a of three drip moldings.Therefore, will not describe these other steps in detail below.
In the 3rd cold forging step S3a, with the top 22 further boil down to larger diameters of secondary forming spare shown in Figure 4 20, to generate Figure 14 and the middle preliminarily forming body 24a as three drip moldings shown in Figure 15 according to this another embodiment.
Particularly, use the 3rd forging die shown in Figure 16 (preliminarily forming mould) 25a, and push the top 22 that is carried in the secondary forming spare 20 among the chamber 27a, thereby by making top 22 preliminarily forming body 24a (three drip moldings) in the middle of compression lower edge axial deformation generates by drift 29a.
As shown in figure 17, drift 29a has slightly recessed annular central zone and is recessed into the annular slope formation part 31a that regional circumferential edges outward radially outward rises from this annular on its terminal surface.The inclined-plane forms part 31a and has circumferential ramps, and different with last embodiment, this circumferential ramps has uniform inclination angle.
As Figure 14 and shown in Figure 15, middle preliminarily forming body 24a comprises: plate-like head 26, and its top 22 than secondary forming part 20 is thinner and diameter is bigger; And bar portion 14, its diameter reduces and 26 bottom one extension from the head.
As shown in the plane, head 26 has: three flaps than major diameter part 28a to 28c, they radially outward stretch out predetermined length and along circumferentially spaced apart angledly with about 120 degree; And the smaller diameter portion 30a to 30c of three bendings and indent, each all is arranged in adjacent than between the major diameter part 28a to 28c.
Particularly, annular slope 36a comprises three with the central authorities (axis C) and the first inclination facet 38a to 38c than the central interconnection of major diameter part 28a to 28c, and the first inclination facet 38a to 38c with respect to the horizontal plane has the inclination alpha of about 3 degree.Annular slope 36a also comprises three with the second inclination facet 40a to 40c of central authorities (axis C) with the central interconnection of smaller diameter portion 30a to 30c, the same with the first inclination facet 38a to 38c, the second inclination facet 40a to 40c with respect to the horizontal plane also has the inclination alpha of about 3 degree.Between the first inclination facet 38a to 38c and the second inclination facet 40a to 40c, the inclination angle is set at and the first inclination facet 38a to 38c and the identical inclination alpha of the second inclination facet 40a to 40c.
The inclination alpha of annular slope 36a is not limited to 3 degree, and for example can be set at 3 values of spending in the 10 degree scopes.
As shown in figure 14, the radial width of annular slope 36a is in the centre maximum than major diameter part 28a to 28c, and in the centre minimum of smaller diameter portion 30a to 30c.Therefore, annular slope 36a is bigger at the area at smaller diameter portion 30a to 30c place than annular slope 36a at the area than major diameter part 28a to 28c place.
By making annular slope 36a bigger than annular slope 36a at the area at smaller diameter portion 30a to 30c place at area than major diameter part 28a to 28c place, the material that is easy to make plastic deformation from smaller diameter portion 30a to 30c towards flowing than major diameter part 28a to 28c.
After finishing the 3rd cold forging step S3a, the same with last embodiment, use the 4th forging die 42 shown in Figure 11 to be used for the 4th cold forging step S4 of backward extrusion with execution.
Usually, for example when reverse extruding forging blank (workpiece), compare with smaller diameter portion, less, like this owing to the different deformation drag of forging blank (ductility) is tending towards causing crackle, material localization etc. than the anti-prolongation amount (stream of plastic momentum) in the major diameter part.
According to this another embodiment, have annular slope 36a the extending along periphery of constant inclination angle α along middle preliminarily forming body 24a than major diameter part 28a to 28c and smaller diameter portion 30a to 30c.Therefore, when the middle preliminarily forming body of backward extrusion 24a, the plastic deformation material is easy to along annular slope 36a from smaller diameter portion 30a to 30c towards flowing than major diameter part 28a to 28c.Like this, material flows in than major diameter part 28a to 28c than in smaller diameter portion 30a to 30c better.
Because annular slope 36a is bigger at the area at smaller diameter portion 30a to 30c place than annular slope 36a at the area than major diameter part 28a to 28c place, therefore with among the smaller diameter portion 30a to 30c compare, impelling has more material stream in than major diameter part 28a to 28c.
Therefore, according to this another embodiment, middle preliminarily forming body 24a be shaped so that with smaller diameter portion 30a to 30c in compare more materials and be tending towards in flowing than major diameter part 28a to 28c.Therefore, in the middle of the backward extrusion during preliminarily forming body 24a, cup 62 is in the basic homogenising of axial dimension than the end face at major diameter part 28a to 28c and smaller diameter portion 30a to 30c place.
The result, according to this another embodiment, prevented from localized by material by four drip moldings 58 that backward extrusion generates, and than major diameter part 28a to 28c make himself material well plasticity flow, thereby reduced fine finishining workload (cutwork amount) in later step.
According to this another embodiment, as mentioned above, preliminarily forming body 24a (three drip moldings) in the middle of before being used to carry out the 4th cold forging step S4 of backward extrusion, forming, thus increase the product precision of the finished product that will in later step, form and reduce fine finishining workload in later step.
For manufacture process according to this another embodiment, before the backward extrusion in the 4th cold forging step S4, formation has the middle preliminarily forming body 24a (this annular slope is constant than the inclination angle at major diameter part 28a to 28c and smaller diameter portion 30a to 30c place) of annular slope 36a, to increase the product precision and the quality stability of finished product 64.
Claims (10)
1, a kind of manufacture method that is used for the outer ring member of tripod type constant-velocity joint, this outer ring member have by cold forging integrally formed bar portion and cup, and this method may further comprise the steps:
The cylindricality workpiece (10) of predetermined length is cut in forward extrusion, has the once-forming body (16) of bar portion (14) with formation;
The top (18) except its described bar portion (14) of the preliminary described workpiece of upsetting (10) is to form secondary forming body (20);
The top (22) except its described bar portion (14) of the further described secondary forming body of upsetting (20), have the middle preliminarily forming body (24) of annular slope (36) with formation, this annular slope provides the material flow resistance poor between than major diameter part (28a to 28c) and smaller diameter portion (30a to 30c);
Preliminarily forming body (24) in the middle of backward extrusion is described has four formed bodies (58) of cup (62) with formation, is limited with rail groove (60a to 60c) in described cup; And
Squeeze the described cup (62) that draws described four formed bodies (58).
2, method according to claim 1, it is characterized in that, preliminarily forming body (24) has plate-like head (26) in the middle of described, this head is thinner and diameter is bigger than the described top (22) of described secondary forming body (20), described head (26) has a plurality of smaller diameter portions (30a to 30c) than major diameter part (28a to 28c) and a plurality of bending and indent when seeing in plane, describedly radially outward stretch out and along circumferentially angled at a predetermined angle spaced apart, and described smaller diameter portion is arranged in adjacent described than between the major diameter part (28a to 28c) than major diameter part.
3, method according to claim 2 is characterized in that, described head (26) has annular slope (36) in the top, and this inclined-plane with respect to the horizontal plane has the inclination angle, and described inclination angle is along circumferentially changing continuously.
4, method according to claim 3, it is characterized in that, described annular slope (36) is located to have inclination alpha and is located to have angle of inclination beta in described smaller diameter portion (30a to 30c) than major diameter part (28a to 28c) described, described angle of inclination beta is greater than described inclination alpha, so that when the described middle preliminarily forming body of backward extrusion in next step (24), according to described poor than the material flow resistance between major diameter part (28a to 28c) and the described smaller diameter portion (30a to 30c), described have different inverted plasticity amount of flow than major diameter part (28a to 28c) with described smaller diameter portion (30a to 30c).
5, method according to claim 4 is characterized in that, described inclination alpha than major diameter part (28a to 28c) is spent in 12 scopes of spending 3 with the difference of the angle of inclination beta of described smaller diameter portion (30a to 30c).
6, method according to claim 3 is characterized in that, the radial width of described annular slope (36) is in described centre maximum than major diameter part (28a to 28c), and in the centre minimum of described smaller diameter portion (30a to 30c).
7, a kind of manufacture method that is used for the outer ring member of tripod constant velocity joint, this outer ring member have by cold forging integrally formed bar portion and cup, and this method may further comprise the steps:
The cylindricality workpiece (10) of predetermined length is cut in forward extrusion, has the once-forming body (16) of bar portion (14) with formation;
The top (18) except its described bar portion (14) of the preliminary described workpiece of upsetting (10) is to form secondary forming body (20);
The top (22) except its described bar portion (14) of the further described secondary forming body of upsetting (20), the middle preliminarily forming body (24a) that has annular slope (36a) with formation, this annular slope a plurality ofly circumferentially extends than major diameter part (28a to 28c) and a plurality of smaller diameter portion (30a to 30c) along it, and describedly partly provides constant inclination angle in (28a to 28c) and the described smaller diameter portion (30a to 30c) than major diameter at it;
Preliminarily forming body (24a) in the middle of backward extrusion is described has four formed bodies (58) of cup (62) with formation, is limited with rail groove (60a to 60c) in described cup; And
Squeeze the described cup (62) that draws described four formed bodies (58).
8, method according to claim 7, it is characterized in that, preliminarily forming body (24a) has plate-like head (26) in the middle of described, this head is thinner and diameter is bigger than the described top (22) of described secondary forming body (20), described head (26) has a plurality of smaller diameter portions (30a to 30c) than major diameter part (28a to 28c) and a plurality of bending and indent when seeing in plane, describedly radially outward stretch out and along circumferentially angled at a predetermined angle spaced apart, and described smaller diameter portion is arranged in adjacent described than between the major diameter part (28a to 28c) than major diameter part.
9, method according to claim 8, it is characterized in that, described head (26) has circular flat (33) and annular slope (36a) in the top, this annular slope extends around described circular flat (33), and circumferentially with respect to the horizontal plane has constant inclination alpha along described than major diameter part (28a to 28c) and described smaller diameter portion (30a to 30c) edge.
10, method according to claim 9 is characterized in that, described annular slope (36a) is bigger at the area of described smaller diameter portion (30a to 30c) than described annular slope (36a) at the described area of locating than major diameter part (28a to 28c).
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003397685A JP4319015B2 (en) | 2003-11-27 | 2003-11-27 | Manufacturing method of outer ring member for constant velocity joint |
| JP397685/2003 | 2003-11-27 | ||
| JP397545/2003 | 2003-11-27 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1886212A true CN1886212A (en) | 2006-12-27 |
| CN100409971C CN100409971C (en) | 2008-08-13 |
Family
ID=34722774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004800350599A Expired - Fee Related CN100409971C (en) | 2003-11-27 | 2004-11-25 | Method of manufacturing outer ring member for constant velocity joint |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JP4319015B2 (en) |
| CN (1) | CN100409971C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767178B (en) * | 2009-12-31 | 2013-01-16 | 深圳航空标准件有限公司 | Manufacturing method of spline shaft by cold heading |
| CN104226703A (en) * | 2013-06-18 | 2014-12-24 | 上海工程技术大学 | Method for manufacturing automobile tension bar joint |
| CN104741879A (en) * | 2015-04-10 | 2015-07-01 | 江苏大洋精锻有限公司 | Processing technology of precision forging sliding sleeve |
| CN106141068A (en) * | 2015-04-20 | 2016-11-23 | 赖传荣 | The forming method of the public conjunction of universal joint and device thereof |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITMI20061838A1 (en) * | 2005-10-05 | 2007-04-06 | Shaft Form Engineering Gmbh | HOMOCINETIC BALL JOINT |
| JP4843302B2 (en) * | 2005-12-09 | 2011-12-21 | 昭和電工株式会社 | Forged molded product, method for producing the same, and die for forging |
| JP5049925B2 (en) * | 2008-08-27 | 2012-10-17 | 本田技研工業株式会社 | Manufacturing method of universal joint outer ring and intermediate product for universal joint outer ring |
| JP5776228B2 (en) * | 2011-03-07 | 2015-09-09 | 株式会社ジェイテクト | Shaft member for rolling bearing device for wheel and manufacturing method thereof |
| CN102814440B (en) * | 2012-08-02 | 2014-11-05 | 盐城理研精密锻造有限公司 | Forging method of cylindrical slide sleeve and reverse extrusion mould |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6038569B2 (en) * | 1978-11-24 | 1985-09-02 | エヌ・テ−・エヌ東洋ベアリング株式会社 | Material for forming the outer ring of constant velocity joints |
| GB8404321D0 (en) * | 1984-02-18 | 1984-03-21 | Pfd Ltd | Tool |
| CN1033791C (en) * | 1992-09-19 | 1997-01-15 | 江兴锻压工业股份有限公司 | Method for making constant-velocity joint outer wheel rough blank |
| CN1033370C (en) * | 1992-10-08 | 1996-11-27 | 江兴锻压工业股份有限公司 | Method for mfg. blank of outer gear for automative driving axle's ball joint |
| JP3770719B2 (en) * | 1997-12-22 | 2006-04-26 | 本田技研工業株式会社 | Forging method and apparatus for outer ring member for constant velocity joint |
-
2003
- 2003-11-27 JP JP2003397685A patent/JP4319015B2/en not_active Expired - Fee Related
-
2004
- 2004-11-25 CN CNB2004800350599A patent/CN100409971C/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101767178B (en) * | 2009-12-31 | 2013-01-16 | 深圳航空标准件有限公司 | Manufacturing method of spline shaft by cold heading |
| CN104226703A (en) * | 2013-06-18 | 2014-12-24 | 上海工程技术大学 | Method for manufacturing automobile tension bar joint |
| CN104741879A (en) * | 2015-04-10 | 2015-07-01 | 江苏大洋精锻有限公司 | Processing technology of precision forging sliding sleeve |
| CN106141068A (en) * | 2015-04-20 | 2016-11-23 | 赖传荣 | The forming method of the public conjunction of universal joint and device thereof |
| CN106141068B (en) * | 2015-04-20 | 2018-07-20 | 赖传荣 | The forming method and its device of the public conjunction of universal joint |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100409971C (en) | 2008-08-13 |
| JP4319015B2 (en) | 2009-08-26 |
| JP2005152982A (en) | 2005-06-16 |
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