CN102179463B - Blank-making rolling method for conical hub of automotive transmission - Google Patents

Blank-making rolling method for conical hub of automotive transmission Download PDF

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Publication number
CN102179463B
CN102179463B CN201010616583A CN201010616583A CN102179463B CN 102179463 B CN102179463 B CN 102179463B CN 201010616583 A CN201010616583 A CN 201010616583A CN 201010616583 A CN201010616583 A CN 201010616583A CN 102179463 B CN102179463 B CN 102179463B
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blank
plane
rolling
diameter
wheel
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CN102179463A (en
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莫亚夫
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Chongqing Ping Gang Machinery Co., Ltd.
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莫亚夫
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Abstract

The invention discloses a blank-making rolling method for a conical hub of an automotive transmission using circular steel as a blank material. The method comprises the steps of cutting, heating, upsetting, punching a blind hole and pre-forming, punching a wad and pressing an end face, performing ring rolling forming, shaping, normalizing, performing impeller blasting, and the like, wherein the key point is that the section of the cavity formed by the mould used in the step of pre-forming and punching a blind hole is approximately the same as a circular inner cavity with different inner and outer diameters corresponding to the blank of the conical hub of the automotive transmission; when the step of performing ring rolling forming is finished, the section of the cavity formed by a rolling wheel and a rolling shaft is completely the same as the circular inner cavity with different inner and outer diameters corresponding to the blank of the conical hub of the automotive transmission, and the outer ring of the rolling wheel and the outer ring of a top wheel are respectively engaged with the outer ring of the blank; and simultaneously, a step of pre-ring rolling is carried out on a part with large deformation difference in the step of performing ring rolling forming. By applying ring rolling process to the blank of the conical hub of the transmission, which is the blank of asymmetric ring, the subsequent machining amount is reduced to the greatest extent, the material consumption is reduced, and the service life of the finished product is prolonged.

Description

Automotive transmission awl hub blank-making rolling method
Technical field
The invention belongs to the automotive transmission technical field, specifically, is a kind of blank-making rolling method of automotive transmission awl hub.
Background technology
China's automotive transmission awl hub blank all is with traditional forging drawing method round steel billet to be processed through operations such as blanking, heating, pier base, compacting, punching the wads so far.Because it is big that awl hub blank has the compacting area of plane; Planar section is thinner, and has higher thin stupefied ring, and each several part appearance and size requires accurately; Forging force during the sealing compacting is very big; Must adopt very large-tonnage forcing press ability compression moulding, so configuration use equipment is big, equipment energy consumption is high.Because awl hub diameter of bore is bigger, so the gross weight weight that punching is removed behind the forging forming is big, material consumption is high.
Method for processing forming is expanded in the rolling that blank-making rolling method for synchronous sliding sleeve of automotive transmission adopts; Only limit to make the symmetrical annulus spare blank of similar synchronous sliding sleeve blank; If being bored this asymmetric annulus spare blank of hub, automotive transmission adopt blank-making rolling method for synchronous sliding sleeve of automotive transmission to carry out the compacting of two part symmetry by two parts; Then when the preforming base; Can't suppress when satisfying when Ring Rolling Machine carries out spreading blank is pressed into a straight tube annulus to the preformed size of awl hub blank part and simply at base; Because awl hub blank finished product each several part wide-to-narrow ratio, thickness are than widely different; The modified difference of each several part when carrying out spreading with straight tube annulus blank (modified difference=external diameter of the preceding corresponding position of rolling expansion and the difference of the internal diameter-external diameter of corresponding position, rolling expansion back and the difference of internal diameter) differs very big; Suppressed when reaching the finished size shape requirement when the differ greatly part of (being that blank is very thick) of inside and outside footpath, the part that interior external diameter differs very little (being that blank is very thin) can't reach at all and satisfy the overall dimensions that finished product requires.And two parts are rolled over when making owing to can't when base, carry out preformed to the not only thick but also narrow part of awl hub in advance; So influences such as blank metal flow property is poor when spreading, the deformation resistance is big are difficult to squeeze into form in the groove not only dark but also narrow in the rolling wheel die cavity and satisfy the blank that finished product appearance and size requires.
Summary of the invention
The objective of the invention is to produce this asymmetric annulus spare blank of automotive transmission awl hub through rolling over the expansion method for processing forming; Reduce the production energy resource consumption to greatest extent; Reduce material consumption, reduce follow-up amount of machining, improve the comprehensive mechanical performance of blank simultaneously.
For solving above technical problem, automotive transmission awl hub blank-making rolling method provided by the invention may further comprise the steps:
A kind of automotive transmission awl hub blank-making rolling method may further comprise the steps:
A) blanking: the size according to finished product awl hub blank is calculated its nt wt net weight; On the basis of this nt wt net weight, consider fire consumption and punching recess consumption; Confirm cutting stock weight; <under 2.5 the condition, confirm round steel diameter and cutting length, round steel is cut into the blank of Len req satisfying cutting length/>round steel diameter;
B) heat: the blank that shears is sent into be heated to 1160~1200 ℃ in the heating furnace;
C) jumping-up: according to the punching die requirement, the blank that is heated to 1160~1200 ℃ is delivered to pier becomes dolioform blank in the forging equipment of corresponding tonnage, the blank height behind the jumping-up is 0.2~0.6 times before the jumping-up;
D) preformed reaches towards blind hole: at the preforming tool of the dolioform blank behind the jumping-up being put into forging equipment, strike out the preform of band blind hole;
E) punching the wad and press end face: when washing out gross weight, blank forged into the smooth blank of both ends of the surface and consider the thermal coefficient of expansion of metal material with forging equipment;
F) roll over to expand moulding: about 1050 ℃ blanks are inserted in to roll over to expand in the mould carry out spreading, roll over finishing temperature >=830 ℃ of expanding moulding blank when accomplishing;
G) shaping: the blank that rolling is processed behind the type carries out shaping with corresponding shaping mould on forging equipment;
H) normalizing: the blank after the shaping is put into normalizing furnace carry out normalizing, eliminate flow of metal stress by normalizing process;
I) ball blast: the iron oxide of eliminating the blank surface;
Key is:
Preforming tool in the said steps d comprises patrix (1), counterdie (2) and the material returned towards (9), and middle part, the below of said patrix (1) is for being provided with round platform (1a); The top of said counterdie (2) is provided with circumferential groove (2a); Said circumferential groove (2a) goes up the plane with counterdie (2) and is divided into outerplanar (2f) and inner plane (2g); Said inner plane (2g) is lower than said outerplanar (2f); The larger diameter end of said circumferential groove (2a) links to each other with outerplanar (2f) through three inclined plane I, II, III (2b, 2c, 2d) successively, and the smaller diameter end of said circumferential groove (2a) links to each other with inner plane (2g) through inclined plane IV (2e), and said inclined plane I (2b) is γ with the angle of circumferential groove (2a) axis; 0 ﹤ γ≤20 °; The angle that said inclined plane II (2c) and counterdie (2) are gone up the plane is α, 0 ﹤ α≤15 °, and said inclined plane III, IV (2d, 2e) they are α with the angle of circumferential groove (2a) axis; 0 ﹤ α≤15 °, the center of said counterdie (2) has circular hole (2h); The said material returned is dashed (9) for cylinder and cylindrical head have circular cone (9a), and the diameter of (9) and circular hole (2h) equal diameters of said counterdie (2) are dashed in this material returned, and said counterdie (2) is enclosed within the said material returned through circular hole (2h) and dashes on (9); Round platform (1a) diameter of said patrix (1) is less than the inner diameter of said counterdie (2) outerplanar (2f) and greater than circular hole (2h) diameter of said counterdie (2);
Rolling among the said step f is expanded mould and is comprised rolling wheel (3), rolles over axle (4) and top wheel (9);
Said rolling wheel (3) is for having the cylinder of coaxial inner; One columniform locating slot (3a) is arranged on the left side of rolling wheel (3); This locating slot (3a) with rolling wheel (3) coaxial and diameter greater than the diameter of bore of rolling wheel (3); The outer toroid diameter of said rolling wheel (3) left end is less than or equal to the parallel axes of outer toroid diameter and the left and right two ends and the rolling wheel (3) of right-hand member; Outer toroid between the left and right two ends of said rolling wheel (3) is provided with circumferential groove (3b); Its axial cross section is shaped as: said circumferential groove (3b) bottom surface is a horizontal plane; The left side of this circumferential groove (3b) links to each other with said rolling wheel (3) left end through three continuous left-leaning inclined-plane I, II, III (3c, 3d, 3e) successively, and the incline direction of said three left-leaning inclined-plane I, II, III (3c, 3d, 3e) is consistent, and the right side of this circumferential groove (3b) links to each other with said rolling wheel (3) right-hand member through a Right deviation inclined-plane (3f); Said Right deviation inclined-plane (3f) is opposite with the incline direction of three left-leaning inclined-plane I, II, III (3c, 3d, 3e), and the width of said circumferential groove (3b) reduces with the increase of circumferential groove (3b) degree of depth gradually; Said left-leaning inclined-plane I, III (3c, 3e) and Right deviation inclined-plane (3f) are α with the angle of rolling wheel (3) left side, and 0 ﹤ α≤15 °, and said left-leaning inclined-plane II (3d) is β with the angle of rolling wheel (3) axis, and 0 ﹤ β≤20 °;
Said rolling axle (4) from left to right is made up of cone (4a), first, second work cylinder (4b, 4c) and the support cylinder body (4d) of coaxial line successively; Said cone (4a) left end diameter is less than the right-hand member diameter; The diameter of the said first work cylinder (4b) is more than or equal to the diameter of the said second work cylinder (4c); The diameter of said support cylinder body (4d) is less than the diameter of the said second work cylinder (4c), and the left end of said cone (4a) has threaded connection hole (4e);
Said top wheel (9) is for having the cylinder of coaxial inner; Top wheel (9) is provided with the hoop boss; Said hoop boss by left side (9a), go up plane (9b) and surround with right side (9c), its axial cross section is shaped as: the left side of this hoop boss (9a) overlaps with the left side of top wheel (9), the last plane (9b) of this hoop boss and to push up the angle of taking turns (9) axis be β; And 0≤β≤20 ° °; The right side of this hoop boss (9c) is α with the angle of top wheel (9) left side, and 0≤α≤15 °, and the larger diameter end of said right side (9c) and the semidiameter of smaller diameter end are L3;
The depth difference L1 at the left and right two ends of said rolling wheel (3) left-leaning inclined-plane I (3c) is less than the semidiameter L2 of the larger diameter end and the smaller diameter end of said counterdie (2) inclined plane II (2c); The depth difference L1 at the left and right two ends of said rolling wheel (3) left plane I (3c) equates with the semidiameter L3 of smaller diameter end with the larger diameter end that (9) hoop boss right side (9c) is taken turns on said top; The angle γ of said counterdie (2) inclined plane I (2b) and circumferential groove (2a) axis is less than or equal to the angle β of said rolling wheel (3) left-leaning inclined-plane II (3d) and rolling wheel (3) axis; Said rolling wheel (3), the parallel axes of rolling over axle (4) and pushing up wheel (9); Rolling wheel (3) and rolling axle (4) arrange that up and down said top wheel (9) is installed in the side-lower of rolling over axle (4).
The present invention is blank with the round steel, reaches after series of processes such as blind hole, punching the wad and pressure end face through blanking, heating, jumping-up, preformed and rolles over expansion moulding, shaping, normalizing and ball blast.The operation principle that moulding is expanded in said rolling is identical with traditional rolling expansion forming principle, and the rolling expansion mould of being made up of rolling wheel, rolling axle and top wheel carries out.
Technological difficulties of the present invention are that a difficult problem is expanded in the rolling that solves asymmetric annulus spare; The basic skills that the present invention adopts is exactly when preformed is accomplished, and the formed die cavity section of preforming tool is roughly the same with the annulus inner chamber in the pairing different inside and outside footpaths of automotive transmission awl hub blank; Roll over to expand moulding when accomplishing rolling wheel the outer toroid of rolling wheel, push up the outer toroid of taking turns and be meshed with the outer toroid of blank respectively with to roll over the formed die cavity section of axle identical with the annulus inner chamber in the pairing different inside and outside footpaths of automotive transmission awl hub blank; The depth difference L1 at the left and right two ends through the left-leaning inclined-plane of control rolling wheel I is less than the semidiameter L2 of larger diameter end and the smaller diameter end of counterdie inclined plane II, is implemented in to roll over when expanding to roll over expansion in advance to rolling in the expansion moulding the big part of modified difference.The depth difference L1 at the left and right two ends of I, plane, a rolling wheel left side equates that with the semidiameter L3 of smaller diameter end L1 and L3 determine by the finished product blank with the larger diameter end of top torus to the boss right side.The draft angle α that is provided with in rolling wheel, counterdie and the top wheel is so that the demoulding after preformed and the rolling expansion.Same angle in the corresponding blank of β that is provided with in the β that is provided with in γ that is provided with in the counterdie and the rolling wheel, the top wheel requires γ to be less than or equal to β simultaneously, and it is in order further to save material that this angle is set.
It is following to roll over the expansion process: with rolling wheel with roll over axle and be contained in respectively on the falsework, blank is enclosed within on the said work cylinder of rolling over axle, rolling wheel is a driving shaft, rolles over axle and is actively socketed on the falsework.Rolling wheel moves down with blank and contacts, and the height of blank can just snap in the circumferential groove of rolling wheel, and rolling wheel drives blank and rotates with rolling wheel.Rolling wheel continues to move down in the process of constantly rolling over the expansion blank, and the height of blank is constant all the time, and the heavy wall of blank reduces gradually, and the diameter of blank constantly becomes big simultaneously.Blank curvature through the rolling wheel spreading is bigger than normal, and the top wheel to the blank applied thrust, helps the flexural deformation of blank outer toroid before blank rolling expansion moulding is accomplished, make the radius of curvature of blank reach requirement.Roll over axial locating wheel (not shown) when contact when blank with being arranged in advance, stop to roll over the expansion molding procedure.
The present invention has used the forge hot performance of round steel material; Through several different methods such as compression, punching, extension, expansions; Utilize the cooperation of preforming tool and rolling wheel, rolling axle to solve the difficult problem of different distortion difference on annular roll milling craft of rolling over the different inside and outside footpaths of the special-shaped annulus spare each several part of manufacture-illegal symmetry correspondence very dexterously, have the following advantages:
1) punching of rolling ring base is little, the punching recess less wastage, and ring sectional dimension shape approaches finished product after the reaming, has avoided machine to add the spillage of material that brings, and compares with forging stock and with the blank that steel pipe processes, and spillage of material has reduced by 15%~30%;
2) because awl hub outside diameter is big; Diameter of bore is big, belongs to the less relatively thin ring of wall thickness, and has wall thickness and the less small circle ring of aspect ratio; Therefore it is very big to seal the required press power of forging and pressing; The devices needed tonnage expands big several times of preformed devices needed tonnage than rolling over, and the blank size that the present invention processes with the equipment of less tonnage has reached the blank size of processing with the equipment of big several times of tonnages, has greatly practiced thrift equipment energy resource consumption and equipment input.
3) rolling over annular strain is radial compression, circumferentially extends, and the blank metallic fiber is arranged along circumference continuously, has improved the inherent quality and the accuracy of manufacture of blank, has improved heat treatment performance, intensity and the wearability of fabricated part, and finished product significantly improves service life.
4) after shaping is accomplished, utilize the residual forging heat insulation to carry out normalized treatment, only this item gets final product energy savings about 40%, effectively reduces manufacturing cost.
Description of drawings
Fig. 1 is the preforming tool sketch map.
Fig. 2 rolles over the structural representation that expands rolling wheel in the former.
Fig. 3 rolles over to expand the structural representation of rolling over axle in the former.
Fig. 4 rolles over the structural representation that expands top wheel in the former.
Fig. 5 rolles over to expand the former sketch map.
Fig. 6 is the right view of Fig. 5.
Fig. 7 is a process chart of the present invention.
Fig. 8 is an automotive transmission awl hub blank drawing.
The specific embodiment
Below in conjunction with accompanying drawing and embodiment the utility model is described further:
Process automotive transmission awl hub blank as shown in Figure 8, adopt technological process as shown in Figure 7:
A) blanking: the size according to finished product awl hub blank is calculated its nt wt net weight; On the basis of this nt wt net weight, consider fire consumption and punching recess consumption; Confirm cutting stock weight; <under 2.5 the condition, confirm round steel diameter and cutting length, round steel is cut into the blank of Len req satisfying cutting length/>round steel diameter; Blank size is to increase allowance according to automotive transmission awl hub finished size, expands the formed precision height because of rolling over, and each processing end face increases 1.5mm allowance and just can satisfy processing request fully.If adopt general each machined surface of original forging base will increase by the allowance of 2.5~5mm.
B) heating: the blank that shears sent into be heated in the electric induction furnace about 1160~1200 ℃, fire consumption is by 15%; Also can send in the gas furnace heating fire consumption is corresponding and increase 3%~4%; Wait to forge.
C) jumping-up: according to the punching die requirement; The blank that is heated to 1160~1200 ℃ is delivered in the forging equipment of corresponding tonnage; Like pneumatic hammer, the forcing press of cranking arm, friction press etc., upset into dolioform blank, the blank height behind the jumping-up is 0.2~0.6 times before the jumping-up.
D) preformed reaches towards blind hole: at the preforming tool of the dolioform blank behind the jumping-up being put into forging equipment, strike out the blank of the band blind hole that is full of the preforming tool inner chamber basically, the key of this procedure is a design preforming tool inner chamber.Preforming tool as shown in Figure 1 dashes 9 by patrix 1, counterdie 2 and the material returned and forms.The middle part, below of patrix 1 is provided with round platform 1a.The top of counterdie 2 is provided with circumferential groove 2a, and circumferential groove 2a is divided into outerplanar 2f and inner plane 2g with plane on the counterdie 2, and inner plane 2g is lower than outerplanar 2f; The larger diameter end of circumferential groove 2a links to each other with outerplanar 2f through three inclined plane I 2b, II 2c, III 2d successively, and the smaller diameter end of circumferential groove 2a links to each other with inner plane 2g through inclined plane IV 2e, and the angle of inclined plane I 2b and circumferential groove 2a axis is γ; 0 ﹤ γ≤20 °; The angle on plane is α on inclined plane II 2c and the counterdie 2,0 ﹤ α≤15 °, and the angle of inclined plane III 2d, IV 2e and circumferential groove 2a axis also is α; 0 ﹤ α≤15 °, the center of counterdie 2 has circular hole 2h; The material returned dashes 9 for cylinder and cylindrical head have circular cone 9a, and 9 the diameter and the circular hole 2h equal diameters of counterdie 2 are dashed in the material returned, and counterdie 2 is enclosed within the material returned on 9 through circular hole 2h; The round platform 1a diameter of patrix 1 is less than the inner diameter of counterdie 2 outerplanar 2f and greater than the circular hole 2h diameter of counterdie 2; This angle of γ expands in the mould for beta, gamma is less than or equal to β, because also will roll over the expansion moulding in rolling.
The groove of the formed pre-shaping blank of round platform 1a of patrix 1 also exists in the blank finished product, and the setting of round platform 1a also is in order to reduce the follow-up amount of machining of blank finished product, also to have practiced thrift raw material simultaneously.Be to optimize preforming tool, the round platform 1a of patrix 1 highly is set to 1~6mm.The circular hole 2h that open at counterdie 2 centers is used for the material returned and dashes 9, with conveniently stripped.Except that having gross weight, preformed blank shapes is that final blank shapes shown in Figure 8 is roughly the same, only on size, has any different.
E) punching the wad and pressure end face: when washing out gross weight, blank is forged into both ends of the surface and satisfy the blank that the system of rolling requires with forging equipment; Consider the thermal coefficient of expansion of metal material, this procedure increases by 0.1~1.5mm with blank forging and pressing height on the basis of blank finished product height when pressing end face.
F) roll over the expansion moulding: through above-mentioned several procedures, 1160~1180 ℃ blank has been cooled to about 1050 ℃ when coming out of the stove.Roll over expanding mould is made up of rolling wheel shown in Figure 2, rolling axle shown in Figure 3 and top wheel shown in Figure 4.
Rolling wheel 3 as shown in Figure 2 is for having the cylinder of coaxial inner, and rolling wheel 3 is made up of left side, right side, outer toroid, and outer toroid is divided into left end and right-hand member by circumferential groove 3b.One columniform locating slot 3a is arranged on the left side of rolling wheel 3; Coaxial and the diameter of this locating slot 3a and rolling wheel 3 is greater than the diameter of bore of rolling wheel 3; The outer toroid diameter of rolling wheel 3 left ends is less than or equal to the parallel axes of outer toroid diameter and the left and right two ends and the rolling wheel 3 of right-hand member; Outer toroid between the rolling wheel 3 left and right two ends is provided with circumferential groove 3b; Its axial cross section is shaped as: circumferential groove 3b bottom surface is a horizontal plane; The left side of this circumferential groove 3b links to each other with rolling wheel 3 left ends through three continuous left-leaning inclined-plane I 3c, II 3d, III 3e successively, and the incline direction of three left-leaning inclined-plane I 3c, II 3d, III 3e is consistent, and the right side of this circumferential groove 3b is passed through a Right deviation inclined-plane 3f and linked to each other with rolling wheel 3 right-hand members; The incline direction of Right deviation inclined-plane 3f and three left-leaning inclined-plane I 3c, II 3d, III 3e is opposite, and the width of circumferential groove 3b reduces with the increase of the circumferential groove 3b degree of depth gradually; The angle of left-leaning inclined-plane I 3c, III 3e and Right deviation inclined-plane 3f and rolling wheel 3 left sides is α, 0 ﹤ α≤15 °, the angle β of left-leaning inclined-plane II 3d and rolling wheel 3 axis, 0 ﹤ β≤20 °; The endoporus of rolling wheel 3 and locating slot 3a can make rolling wheel 3 firmly be installed on the falsework, and can guarantee that rolling wheel 3 play can not take place in the spreading process.The angle of inclination γ of counterdie inclined plane I 2b in the inclination angle beta of left-leaning inclined-plane II 3d and the preformed is corresponding, and the size of β is determined by the blank finished product and be identical with the finished product angle.α in the rolling wheel 3 is draft angle, and is conveniently stripped; The extruding of being convenient to metal in the spreading process is simultaneously flowed, and guarantees that the blank metallic object is full of the circumferential groove 3b of rolling wheel 3, rolles over the complete rule of blank profile of making.
Rolling axle 4 as shown in Figure 3 from left to right is made up of the cone 4a of coaxial line, the first work cylinder 4b, the second work cylinder 4c and support cylinder body 4d successively.Cone 4a left end diameter is less than or equal to the right-hand member diameter; The diameter of the first work cylinder 4b is greater than the diameter of the second work cylinder 4c; The diameter of support cylinder body 4d is less than the diameter of the second work cylinder 4c, and the left end of cone 4a has threaded connection hole 4e.
Top wheel 9 as shown in Figure 4 is for cylinder and have coaxial endoporus, and endoporus is an installing hole.Top wheel 9 is provided with the hoop boss; The hoop boss by left side 9a, go up plane 9b and right side 9c surrounds, its axial cross section is shaped as: the left side 9a of this hoop boss overlaps with the left side of top wheel 9, the last plane 9b of this hoop boss and to push up the angle of taking turns 9 axis be β; 0≤β≤20 °; The right side 9c of this hoop boss is α with the angle of top wheel 9 left sides, 0≤α≤15 °, and the larger diameter end of right side 9c and the semidiameter of smaller diameter end are L3.Last plane 9b and the angle β that pushes up wheel 9 axis, corresponding with the inclination angle beta of left-leaning inclined-plane II 3d, equally by blank finished product decision and identical with the finished product angle; α is a draft angle, and is corresponding with draft angle α in the rolling wheel 3.
The depth difference at the left and right two ends of rolling wheel 3 left-leaning inclined-plane I 3c is L1, and the larger diameter end of counterdie 2 inclined plane II 2c and the semidiameter of smaller diameter end are L2, and L1 is less than L2, and this is the key that guarantees the big part of blank modified difference is rolled in advance expansion.The profile of automotive transmission awl hub blank has determined to snap in the blank 6 modified difference maximum herein of rolling wheel 3; Simultaneously, the depth difference L1 at the left and right two ends of I 3c, rolling wheel 3 left plane equals to push up the larger diameter end of hoop boss right side 9c in the wheel 9 and the semidiameter L3 of smaller diameter end.The parallel axes of rolling wheel 3, rolling axle 4 and top wheel 9, rolling wheel 3 arranges up and down that with rolling axle 4 top wheel 9 is installed in the side-lower of rolling axle 4.
As shown in Figure 5; Rolling wheel 3 and rolling axle 4 are contained in respectively on the falsework 5; Blank 6 is inserted in the first work cylinder 4a that rolles over axle 4 and the second work cylinder 4b from the right-hand member of rolling over axle 4 goes up the big end of blank 6 diameter of bores and be positioned at the left side, through the not shown rolling wheel 3 of depressing of the forcing press of rolling wheel 3 tops.Rolling wheel 3 is a driving shaft, rolles over axle 4 and is actively socketed on the falsework 5.In conjunction with Fig. 5, Fig. 6; Rolling wheel 3 moves down with blank 6 and contacts; The height of blank 6 can just snap in the circumferential groove 3b of rolling wheel 3; Rolling wheel 3 circumferential groove 3b at first contact (the modified difference here is maximum) with the top of blank 6, because the top modified difference of blank 6 is maximum, therefore when rolling is expanded, guaranteed the big part of modified difference is shifted to an earlier date spreading.Rolling wheel 3 drives blank 6 and rolles over axle 4 with rolling wheel 3 rotations, begins to roll over the expansion moulding.Rolling wheel 1 continues to move down in the process of continuous spreading blank 6, and the height of blank 6 is constant all the time, and the heavy wall of blank 6 reduces gradually, and the diameter of blank 6 constantly becomes big simultaneously.As shown in Figure 6, blank 6 at first contacts with being arranged on the top wheel 9 of rolling over axle 4 side-lowers, applies certain thrust by top 9 pairs of blanks 6 of wheel.Rolling wheel 1, roll over axle 4 and top wheel 9 direction of rotation shown in arrow, rolling wheel 1, top wheel 9 respectively with blank 6 engagements.When blank 6 and when being arranged on the signal wheel 10 of rolling over around the axle 2 in advance and contact, stop to roll over the expansion molding procedure.Roll over to expand finishing temperature >=830 ℃ of moulding blank when accomplishing; As shown in Figure 5,7 pairs of bracing frames are rolled over axle 4 and are played a supportive role, to guarantee to roll over the normal rotation of axle 4.Roll over axle 4 and baffle plate 8 is set, guarantee that blank 6 does not move axially rolling over to expand in the forming process in the left side of blank 6.
As shown in Figure 5, rolling wheel 3 is to decide according to the version of automotive transmission awl hub blank as shown in Figure 8 with the setting of rolling over axle 4.In the specific implementation, the wall thickness of the circumferential groove depth ratio blank 6 of rolling wheel 3 usually lacks 1~3mm, therefore, rolling wheel 3 in the spreading process with the distance >=1~3mm that rolles over axle 4.
Expand molding procedure for further optimizing to roll over, the circumferential groove 3b rounding on the rolling wheel 3, the right-hand member rounding of the first work cylinder 4b of rolling axle 4.
G) shaping: the blank that rolling is processed behind the type carries out shaping with corresponding shaping mould on forging equipment, further improve the geometric accuracy of blank, this moment blank temperature >=830 ℃.
H) normalizing: the blank after the shaping is put into normalizing furnace carry out normalizing, eliminate flow of metal stress by normalizing process;
I) ball blast: the blank after the normalizing is carried out ball blast, eliminate the iron oxide on blank surface.
Whole process flow belongs to the conventional process flow process that ring processing is rolled in forging and pressing; Why can process this asymmetric hoop of automotive transmission awl hub blank external diameter annular blank in a plurality of differences is arranged; Its key is to have used preforming tool as shown in Figure 1 in steps d preformed and in the blind hole and rolled over to expand at step f to have used rolling wheel as shown in Figure 23, rolling axle 4 as shown in Figure 3 and top wheel 9 as shown in Figure 4 in the moulding; The circumferential groove degree of depth through control preforming tool and rolling wheel 3 is inconsistent, and the big part of modified difference shifts to an earlier date spreading in the expansion moulding to rolling over.

Claims (4)

1. an automotive transmission is bored the hub blank-making rolling method, may further comprise the steps:
A) blanking: the size according to finished product awl hub blank is calculated its nt wt net weight; On the basis of this nt wt net weight, consider fire consumption and punching recess consumption; Confirm cutting stock weight; <under 2.5 the condition, confirm round steel diameter and cutting length, round steel is cut into the blank of Len req satisfying cutting length/>round steel diameter;
B) heat: the blank that shears is sent into be heated to 1160~1200 ℃ in the heating furnace;
C) jumping-up: according to the punching die requirement, the blank that is heated to 1160~1200 ℃ is delivered in the forging equipment of corresponding tonnage and upset into dolioform blank, the blank height behind the jumping-up is 0.2~0.6 times before the jumping-up;
D) preformed reaches towards blind hole: the more dolioform blank behind the jumping-up is put into the preforming tool of forging equipment, struck out the preform of band blind hole;
E) punching the wad and press end face: when washing out gross weight, blank forged into the smooth blank of both ends of the surface and consider the thermal coefficient of expansion of metal material with forging equipment;
F) roll over to expand moulding: about 1050 ℃ blanks are inserted in to roll over to expand in the mould carry out spreading, roll over finishing temperature >=830 ℃ of expanding moulding blank when accomplishing;
G) shaping: will roll over the blank that expands after the moulding and on forging equipment, carry out shaping with corresponding shaping mould;
H) normalizing: the blank after the shaping is put into normalizing furnace carry out normalizing, eliminate flow of metal stress by normalizing process;
I) ball blast: the iron oxide of eliminating the blank surface;
It is characterized in that:
Preforming tool in the said steps d comprises patrix (1), counterdie (2) and the material returned towards (9), and middle part, the below of said patrix (1) is provided with round platform (1a); The top of said counterdie (2) is provided with circumferential groove (2a); Said circumferential groove (2a) goes up the plane with counterdie (2) and is divided into outerplanar (2f) and inner plane (2g); Said inner plane (2g) is lower than said outerplanar (2f); The larger diameter end of said circumferential groove (2a) links to each other with outerplanar (2f) through three inclined plane I, II, III (2b, 2c, 2d) successively, and the smaller diameter end of said circumferential groove (2a) links to each other with inner plane (2g) through inclined plane IV (2e), and said inclined plane I (2b) is γ with the angle of circumferential groove (2a) axis; 0 ﹤ γ≤20 °; The angle that said inclined plane II (2c) and counterdie (2) are gone up the plane is α, 0 ﹤ α≤15 °, and said inclined plane III, IV (2d, 2e) they are α with the angle of circumferential groove (2a) axis; 0 ﹤ α≤15 °, the center of said counterdie (2) has circular hole (2h); The said material returned is dashed (9) for cylinder and cylindrical head have circular cone (9a), and the diameter of (9) and circular hole (2h) equal diameters of said counterdie (2) are dashed in this material returned, and said counterdie (2) is enclosed within the said material returned through circular hole (2h) and dashes on (9); Round platform (1a) diameter of said patrix (1) is less than the inner diameter of said counterdie (2) outerplanar (2f) and greater than circular hole (2h) diameter of said counterdie (2);
Rolling among the said step f is expanded mould and is comprised rolling wheel (3), rolles over axle (4) and top wheel (9);
Said rolling wheel (3) is for having the cylinder of coaxial inner; One columniform locating slot (3a) is arranged on the left side of rolling wheel (3); This locating slot (3a) with rolling wheel (3) coaxial and diameter greater than the diameter of bore of rolling wheel (3); The outer toroid diameter of said rolling wheel (3) left end is less than or equal to the parallel axes of outer toroid diameter and the left and right two ends and the rolling wheel (3) of right-hand member; Outer toroid between the left and right two ends of said rolling wheel (3) is provided with circumferential groove (3b); Its axial cross section is shaped as: said circumferential groove (3b) bottom surface is a horizontal plane; The left side of this circumferential groove (3b) links to each other with said rolling wheel (3) left end through three continuous left-leaning inclined-plane I, II, III (3c, 3d, 3e) successively, and the incline direction of said three left-leaning inclined-plane I, II, III (3c, 3d, 3e) is consistent, and the right side of this circumferential groove (3b) links to each other with said rolling wheel (3) right-hand member through a Right deviation inclined-plane (3f); Said Right deviation inclined-plane (3f) is opposite with the incline direction of three left-leaning inclined-plane I, II, III (3c, 3d, 3e), and the width of said circumferential groove (3b) reduces with the increase of circumferential groove (3b) degree of depth gradually; Said left-leaning inclined-plane I, III (3c, 3e) and Right deviation inclined-plane (3f) are α with the angle of rolling wheel (3) left side, and 0 ﹤ α≤15 °, and said left-leaning inclined-plane II (3d) is β with the angle of rolling wheel (3) axis, and 0 ﹤ β≤20 °;
Said rolling axle (4) from left to right is made up of cone (4a), first, second work cylinder (4b, 4c) and the support cylinder body (4d) of coaxial line successively; Said cone (4a) left end diameter is less than the right-hand member diameter; The diameter of the said first work cylinder (4b) is more than or equal to the diameter of the said second work cylinder (4c); The diameter of said support cylinder body (4d) is less than the diameter of the said second work cylinder (4c), and the left end of said cone (4a) has threaded connection hole (4e);
Said top wheel (9) is for having the cylinder of coaxial inner; Top wheel (9) is provided with the hoop boss; Said hoop boss by left side (9a), go up plane (9b) and surround with right side (9c), its axial cross section is shaped as: the left side of this hoop boss (9a) overlaps with the left side of top wheel (9), the last plane (9b) of this hoop boss and to push up the angle of taking turns (9) axis be β; And 0≤β≤20 °; The right side of this hoop boss (9c) is α with the angle of top wheel (9) left side, and 0≤α≤15 °, and the larger diameter end of said right side (9c) and the semidiameter of smaller diameter end are L3;
The depth difference L1 at the left and right two ends of said rolling wheel (3) left-leaning inclined-plane I (3c) is less than the semidiameter L2 of the larger diameter end and the smaller diameter end of said counterdie (2) inclined plane II (2c); The depth difference L1 at the left and right two ends of said rolling wheel (3) left plane I (3c) equates with the semidiameter L3 of smaller diameter end with the larger diameter end that (9) hoop boss right side (9c) is taken turns on said top; The angle γ of said counterdie (2) inclined plane I (2b) and circumferential groove (2a) axis is less than or equal to the angle β of said rolling wheel (3) left-leaning inclined-plane II (3d) and rolling wheel (3) axis; Said rolling wheel (3), the parallel axes of rolling over axle (4) and pushing up wheel (9); Rolling wheel (3) and rolling axle (4) arrange that up and down said top wheel (9) is installed in the side-lower of rolling over axle (4).
2. according to the described automotive transmission awl of claim 1 hub blank-making rolling method, it is characterized in that:
Circumferential groove (3b) rounding on the said rolling wheel (3), the right-hand member rounding of the first work cylinder (4b) of said rolling axle (4).
3. according to the described automotive transmission awl of claim 1 hub blank-making rolling method, it is characterized in that: the round platform (1a) of said patrix (1) highly is 1~6mm.
4. according to the described automotive transmission awl of claim 1 hub blank-making rolling method, it is characterized in that: the heating furnace among the said step b is electric induction furnace or gas furnace.
CN201010616583A 2010-12-31 2010-12-31 Blank-making rolling method for conical hub of automotive transmission Expired - Fee Related CN102179463B (en)

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CN102501000B (en) * 2011-09-28 2014-04-02 南阳市红阳锻造有限公司 Precision forming process for rim supporting shafts of engineering machinery and heavy-duty trucks
CN102989942A (en) * 2012-08-22 2013-03-27 昌利锻造有限公司 Forging method of single-throw crank shaft
CN102989940A (en) * 2012-08-22 2013-03-27 昌利锻造有限公司 Processing method of positioning hook forge piece
CN108526238B (en) * 2018-03-16 2020-03-20 北京航星机器制造有限公司 Hot extrusion near-net forming method for asymmetric aluminum alloy flange plate with lugs

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Publication number Priority date Publication date Assignee Title
CN2187503Y (en) * 1994-02-26 1995-01-18 方东 Swinging roll compaction machine
CN1978125A (en) * 2006-12-06 2007-06-13 贵州安大航空锻造有限责任公司 Rolling formation method for large and medium size solid plate-shape forge piece

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US7198558B2 (en) * 2005-03-18 2007-04-03 Hantover, Inc. Knife blade dressing apparatus

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Publication number Priority date Publication date Assignee Title
CN2187503Y (en) * 1994-02-26 1995-01-18 方东 Swinging roll compaction machine
CN1978125A (en) * 2006-12-06 2007-06-13 贵州安大航空锻造有限责任公司 Rolling formation method for large and medium size solid plate-shape forge piece

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Address after: The 9 group of 402762 Chongqing District of Bishan city streets Longjing Bi Cheng Wan Village

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