Rotary extrusion forming method and mould thereof
The present invention relates to a kind of rotary extrusion forming machining manufacture that utilizes, the present invention also relates to the die device that adopts in this rotary extrusion forming processing method simultaneously.
Clutch sleeve mostly is an internal thread spline in the automobile starter isolator, and existing processing method is to use broaching tool to broach on special broaching machine basically and finishes.There are the following problems to use at present broaching tool broaching processing, broaching tool make require high, complex process, and the broaching life-span of broaching tool generally mostly be most 10,000 more, repeatedly reconditioning also will be carried out in the centre, the broaching efficient of broaching machine is not high yet simultaneously.Though internal thread spline can adopt cold extrusion method to be shaped and process, correlative study at present and application are not a lot.The patent No. is that 03134183.7 Chinese invention patent discloses a kind of internal thread spline extrusion molding processing method and device, though the disclosed technical scheme of this patent of invention can be used for the internal thread spline extrusion process, but owing to its structural reason, make the production and processing complex procedures, the internal thread spline surface roughness is big, and waste material is more.After drift squeezes into workpiece in the prior art, often need with contain the workpiece that pushes drift be placed on other the device in push once more, drift can be taken out, complex procedures, efficient is lower; The cone angle of the drift in this patent is less simultaneously, is roughly the 20-25 degree, and the waste material of Chan Shenging is more like this, and is economical inadequately.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of manufacturing procedure simpler on the basis of above-mentioned cold-extrusion shaping processing method, the rotary extrusion forming method that efficient is higher and waste material is less; For this reason, the present invention also provides employed die device in this rotary extrusion forming method.
For solving the problems of the technologies described above, the invention provides following technical scheme: a kind of rotary extrusion forming method, comprise the preparation of drift, the preparation and the extruding spline step of blank workpiece, it is characterized in that also comprising following steps:
A. the preparation process of drift, the capillus base that liquidates are carried out turning processing, axially are processed into localization part successively, clamp-on part, shaped portion, trim part and clamping part along drift, wherein shaped portion are processed into ligament;
B. the preparation process of blank workpiece is pressed the endoporus of drift localization part dimensioned workpiece;
C. push the spline step, workpiece is fixed in the counterdie in the die, drift is installed in the drift cover of patrix, it is descending that patrix drives drift, the localization part of drift is inserted in the workpiece endoporus, continues descendingly, the clamp-oning partly of described drift, shaped portion and trim part are clamp-oned in the workpiece endoporus successively, drift rotation under the thrust ball bearing effect that cooperates with it presses down advances, until being extruded onto required spline effective length;
D. drift withdraws from step, and patrix is up, and it is up to drive drift, and drift withdraws from the rotation of spline helical angle.
As a kind of preferred version of rotary extrusion forming method of the present invention, wherein: among the described step a, it is 0.5 millimeter-5 millimeters ligament that shaped portion is processed into width; Among the described step c, during the descending extruding of patrix, push workpiece under the effect of drift radial ball bearing and thrust ball bearing in the drift cover; In the described steps d, patrix is up, and described drift spiral under the bearing effect withdraws from.
As a kind of preferred version of rotary extrusion forming method of the present invention, wherein: among the described step c, it is descending that patrix drives drift, the each several part of drift is clamp-oned in the workpiece endoporus successively, die and workpiece wherein rotate under the effect of drift spiral radial load and thrust ball bearing, until being extruded onto required spline effective length; In the described steps d, patrix is up, and it is up to drive drift, and described die and workpiece wherein rotate under the effect of the radial load of drift spiral and thrust ball bearing, withdraw from until drift.
As implementing a kind of mould of rotary extrusion forming method of the present invention, wherein: described mould is made up of upper die and lower die, described patrix is provided with the drift cover, drift wherein is installed, described counterdie is provided with die, but place work piece wherein, described drift vertically successively by localization part, clamp-on part, shaped portion, retouch and clamping part and form, described shaped portion is a ligament, and drift and die two parts have at least parts to be equipped with thrust ball bearing.
As a kind of preferred version of implementing rotary extrusion forming method mould of the present invention, wherein: the shaped portion of described drift is that width is the ligament of 0.5-5 millimeter.
As a kind of preferred version of implementing rotary extrusion forming method mould of the present invention, wherein: the modular angle degree of going into of clamp-oning part of described drift is 30 degree-70 degree.
As a kind of preferred version of implementing rotary extrusion forming method mould of the present invention, wherein: the shaped portion of described drift is the ligament of 3 mm wides, and the described modular angle of going into of clamp-oning part is 60 degree.
As a kind of preferred version of implementing rotary extrusion forming method mould of the present invention, wherein: the localization part front end of described drift is provided with round table-like leader.
As a kind of preferred version of implementing rotary extrusion forming method mould of the present invention, wherein: be provided with radial ball bearing in the described drift cover and match with drift.
As a kind of preferred version of implementing rotary extrusion forming method mould of the present invention, wherein: described drift cover top is provided with thrust ball bearing, its inside is provided with radial ball bearing and thrust ball bearing matches with the targeting part of drift, described body diameter cooperates with retainer and is installed in the lower die-sleeve, the lower end is supported by thrust ball bearing, the upper end links to each other with rotary pressure plate by one group of ball, and described counterdie is provided with stripping attachment.
Adopt rotary extrusion forming method of the present invention and mould thereof, owing on drift, increased ligament, this ligament can be offset a part of elastic deformation amount after workpiece is squeezed, thereby the frictional force when reducing extruding, further reduce extruding force, make workpiece and drift be unlikely to plucking damage because frictional force is excessive; The setting of ligament simultaneously also further reduces to push finishes the frictional force that is run into when back punching head withdraws from, and this point is most important, and it makes drift directly withdraw from workpiece becomes possibility, has obviously simplified operation.The yielding amount, promptly the number range of Δ is generally got 0.008-0.01dl between ligament and the trim part when the extruding ferrous metal, generally gets 0.05-0.15dl during non-ferrous metal, and H gets 2-3mm during ligament extruding ferrous metal, and extruding non-ferrous metal H gets 0.5-1.5mm.Drift go into modular angle degree a be 60 the degree about, choose this equal angles then clamp-on the part shorter, help reducing waste material.The leader of drift has when drift and workpiece endoporus have tiny deviation the function of location automatically.The purpose of the inner a plurality of radial ball bearings that match with the targeting part of drift of drift cover is to make drift keep good axiality in the course of the work, makes the stability of drift improve, and prevents that generation is offset and drift is fractureed when extruding.Thrust ball bearing is set, and frictional force is littler in the time of can making drift extruding downlink or uplink, moves more level and smooth.
Rotary extrusion forming method of the present invention and traditional broaching processing are compared: the efficient aspect, broaching is generally 80/hour, and the rotation extruding is 240/hour; The roughness aspect, broaching is Ra 6.3, the rotation extruding is Ra 1.0; Broach 12 grades in spline precision aspect, the rotation extruding is 8 grades; Cutter die life-span aspect, about 10,000 of broaching tools, rotation extruding drift is about 50,000, and the cost of drift is also lower than the cost of broaching tool.
Description of drawings
The present invention will be further described in detail below in conjunction with drawings and embodiments.
Fig. 1 is the structural representation of drift in the mould of the present invention.
Fig. 2 is the local enlarged diagram of the shaped portion of drift in the mould of the present invention.
Fig. 3 is the structural representation of the rotatable mould of a kind of drift of the present invention.
Fig. 4 is the structural representation of the rotatable mould of the another kind of die of the present invention.
The specific embodiment
Fig. 1 is the structural representation of drift in the mould of the present invention, and wherein drift mainly contains following seven and partly forms: guiding partly A, location partly B, clamp-on partly C, shaped portion D, finishing partly E, guiding partly F, clamp partly G.The major function of drift each several part: guiding partly A enters in the workpiece hole for making drift automatically; Location part B is mainly workpiece is located automatically; Clamp-on partly C, major parameter is gone into modular angle and is generally got the 30-70 degree for going into modular angle; The part that is shaped D, the ligament part of promptly working, general length is got 1-5mm, is mainly to reduce friction, and prevents that mould from producing the plucking phenomenon; Finishing is E partly, after promptly blank enters finishing partly, is repairing under the partly helical angle control, and the blank workpiece is done stable motion by the shape of helical angle fully; Guiding is F partly, and the direction of mainly fixing whole drift is identical with the function of normal anti-crowded drift; G clamps partly, clamping drift during for the extruding material returned.
Rotary extrusion forming method comprises the preparation of preparation, blank workpiece of drift and extruding spline and withdraws from step that its mould can be divided into the rotatable mould of drift and two kinds of different structures of the rotatable mould of die again, represents with Fig. 3 and Fig. 4 respectively.Mould among Fig. 3 and Fig. 4 mainly is made up of patrix I and counterdie II, and specifically each parts is: cover 10, counterdie overcoat 11, die 12, stripping attachment 13, lower die-sleeve 14, material returned slide block 15, pressure block 16, centre circle 17, counterdie connect cover 18, lower bolster 19, downforce piece 20, material returned bar 21, down and cap 22, cope match-plate pattern pressure block 23, go up and cap 24, rotary pressure plate 25, ball 26, retainer 27 in cope match-plate pattern 1, thrust ball bearing 2, Upper Die-sleeve 3, upward pressure piece 4, positioning sleeve 5, drift cover 6, radial ball bearing 7, drift 8, workpiece 9, the counterdie.
One, the rotatable mould of rotary extrusion forming method and drift sees Fig. 3 for details
Method: the preparation process of a. drift, 1. the capillus base that liquidates carries out turning processing, material selection high-speed steel or carbide alloy, axially form leader A successively along the rotation drift, localization part B, clamp-on portion C, shaped portion D, trim part E and clamping part G, 2. look mold materials and determine whether heat treatment, it is 59-65HRC that high-speed steel is quenched to hardness, carbide alloy does not need heat treatment, 3. with electric spark or numerical control mill processing spline part, 4. leader A is processed into truncated conical shape, the external diameter of localization part B is determined tolerance fit by the spline path, its gap is 0.2-0.4mm, 5. the modular angle of going into of clamp-oning part is processed into 30 degree-70 degree, and 6. to be processed into width be 0.5 millimeter-3 millimeters ligament to shaped portion, also can be wide to 5 millimeters, 7. carry out flank of tooth grinding and polishing, make roughness reach Ra0.05;
B. the preparation process of blank workpiece is pressed drift localization part dimensioned blank workpiece 9 endoporus, and its gap is 0.05-0.2mm, need not annealing softening and handles, and directly carries out the phospholeum lubricated;
C. push the spline step, blank workpiece 9 is placed the die cavity of the die 12 of counterdie II, the clamping part of drift 8 is installed in the drift cover 6 of patrix I, drift cover 6 cooperates with bearing 2.The extruding impulse stroke: drift 8 is descending, the leader B of drift 8 is inserted in the blank workpiece endoporus, continue descendingly, clamp-on the blank workpiece from beginning to be expressed to the drift trim part, drift 8 presses down with the screw rotation and advances, until being extruded onto required spline effective length;
D. drift withdraws from step, and patrix I is up, and it is up to drive drift, and drift 8 overcomes the frictional force of bearing with helical angle motion rotation, and drift 8 rotations are withdrawed from.
The modular angle degree of going into of clamp-oning portion C among the described step a is 60 degree, and described shaped portion D is the ligament of 3 mm wides.Among described step c and the d, during with the descending extruding of patrix I and the up material returned, the pressure block on drift 8 tops significantly reduces frictional force because thrust ball bearing 2 has been installed, and when drift 8 was clamp-oned workpiece, the radial component that helical angle forms made drift rotate extruding thereupon and withdraw from.
Mould: the mould of the rotatable extruding of a kind of drift, described mould is made up of patrix I and counterdie II, is provided with drift cover 6 in the patrix, and described rotatable drift 8 is installed in wherein, and drift cover 6 matches with bearing.Described counterdie is provided with die 12, and described die 12 matches with drift 8.Described drift shaped portion D is that width is the ligament of 0.5-5 millimeter, and Δ is 0.008-0.15dl between ligament and the trim part, and dl is the spline external diameter.The modular angle degree of going into of clamp-oning portion C of described drift 8 is 30 degree-70 degree.The front end of the localization part B of described drift 8 is provided with leader A, and described leader A is round table-like.Described drift overlaps 6 tops and is provided with thrust ball bearing 2, and inside is provided with at least one radial ball bearing 7 and matches with drift.
Two, the rotatable mould of die sees Fig. 4 for details
Be with the different of the rotatable mould of drift: the drift of the rotatable mould of die is in crush stroke and return in the stroke and all do not rotate.Drift extruding is advanced and when withdrawing from die, in the radial load of drift spiral and effect lower cavity die (12) rotation of bearing.The clamping part of described mold and punching head 8 is installed in the drift cover 6 of patrix, drift cover 6 by last and cap 24 be fixed with Upper Die-sleeve 3 in.Die 12 is rotatable in the described counterdie, and described die 12 external diameters cooperate with retainer 27 and are installed in the lower die-sleeve 14, and the lower end is by thrust ball bearing 2 supportings, and the upper end links by one group of ball 26 and rotary pressure plate 25.
The present invention is not limited to internal thread spline cold extrusion processing; also be applicable to general metal rotation extrusion process industry; protection scope of the present invention also is not limited to the mode among the embodiment simultaneously, and technical scheme all belongs to protection scope of the present invention described in the claim as long as adopt.