CN102501021A - Machining method for screws of dovetail grooves and cold-upsetting die of machining method - Google Patents
Machining method for screws of dovetail grooves and cold-upsetting die of machining method Download PDFInfo
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- CN102501021A CN102501021A CN2011103544333A CN201110354433A CN102501021A CN 102501021 A CN102501021 A CN 102501021A CN 2011103544333 A CN2011103544333 A CN 2011103544333A CN 201110354433 A CN201110354433 A CN 201110354433A CN 102501021 A CN102501021 A CN 102501021A
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Abstract
The invention provides a machining method for screws of dovetail grooves and a cold-upsetting die of the machining method, which are applicable to the technical field of machining. The machining method includes steps of cutting a blank according to the line diameter of the blank required for machining a screw of a dovetail and a service brand; machining the blank into a semi-finished product of the screw of the dovetail groove by a cold upsetting machine by the aid of the cold-upsetting die for screws of dovetail grooves; forming the head of the semi-finished product of the screw of the dovetail groove, and performing a rod of the semi-finished product; performing quenching and tempering thermal processing for the semi-finished product of the screw of the dovetail groove; and rolling threads of the rod of the semi-finished product of the screw of the dovetail groove after the quenching and tempering thermal processing, squeezing and molding the threads, and obtaining the screw of the dovetail groove. Accordingly, precision and efficiency of machining of the screw of the dovetail groove are improved.
Description
Technical field
The present invention relates to the Machining Technology field, relate in particular to a kind of processing method and cold-heading mould thereof of dovetail groove screw.
Background technology
The starting of engine needs the support of external force, and automobile starter is being played the part of this role exactly.Taking it by and large, starter is realized whole starting process with three parts.Dc motor is introduced from the electric current of battery and is made the driven wheel of starter produce mechanical movement; Transmission mechanism engages into flywheel teeth figure with driven wheel, can after engine start, throw off automatically simultaneously; The break-make of starter circuit capable is then controlled by an electromagnetic switch.
Engine must rotate by external force with before self power running.Engine carries out the transition to the process that can turn round voluntarily by external force by inactive state, is called the starting of engine.The start mode that engine is commonly used has manpower starting, auxiliary gasoline starting and three kinds of forms of electric cranking.Manpower starting adopts rope to draw or hand mode, and is simple but inconvenient, and labour intensity is big, only is applicable to some low power engines, on some automobiles only in support mode keeping; Auxiliary gasoline starting mainly is used on the powerful Diesel engine; The electric cranking mode is easy and simple to handle, and starting rapidly has the re-lighting ability, and can far distance controlled, is therefore extensively adopted by Hyundai Motor.
In the electric starter motor start-up system, the dovetail groove screw uses on starter switch, and copper sheet is pressed in the screw head dovetail groove, and the movable contact spring of switch contacts conduction and connects switch with copper sheet, starts starter.Because of its service condition poor; Under high temperature, gap high-frequency vibration condition, be on active service for a long time; The purpose of the design of dovetail groove is to guarantee that the contact stabilization of copper sheet and movable contact spring is reliable with this understanding, prevents that copper sheet from getting loose from the dovetail groove screw, and is reliable to guarantee contact stabilization.
So the oat tail groove structure of dovetail groove screw is special, required precision is higher.In the prior art, early stage, the client adopted these article of machine cut processing and manufacturing, processing technology: bar-machining center (turning)-surface treatment (plating)-packing.Because of machining center converted products production efficiency low (about 3min/PCS), stock utilization low (about 30%) causes its product cost high; Carry out in the fatigue test process the client, the dovetail groove distortion takes place, copper sheet comes off and causes loose contact, the situation that starter can't start.So the processing of dovetail groove is if adopt existing machining center to accomplish, its processing cost is high, inefficiency, and destroyed the interior metal streamline because of cut, and weakened the fatigue strength of product, be difficult to satisfy the client to requirement of products.
Can know that to sum up the process technology of existing dovetail groove screw obviously exists inconvenience and defective, so be necessary to improve on reality is used.
Summary of the invention
To above-mentioned defective, the object of the present invention is to provide a kind of processing method and cold-heading mould thereof of dovetail groove screw, to improve the precision and the efficient of the processing of dovetail groove screw.
In order to realize the foregoing invention purpose, the invention provides a kind of processing method of dovetail groove screw, said method comprises:
The required material base line footpath and the used trade mark of the said dovetail groove screw of processing cuts said material base as required;
Adopt cold headers said material base to be processed into cold-heading dovetail groove screw semi-finished product through the cold-heading mould of said dovetail groove screw; The half-finished head moulding of said cold-heading dovetail groove screw, its bar portion preformed;
Said cold-heading dovetail groove screw semi-finished product are carried out modified heat treatment;
The half-finished bar of said cold-heading dovetail groove screw portion after the modified heat treatment is carried out thread rolling, and the thread-rolling screw moulding obtains said dovetail groove screw.
According to described processing method, said cold-heading mould comprises:
Four groups of formpistons comprise first, second, third station formpiston and edger;
Four groups of formers comprise respectively and said first, second, third station formpiston and the first, second, third and the 4th corresponding station former of edger;
Said four groups of formpistons and four groups of formers are fixed on the cold headers; And the manipulator through said cold headers is displaced into said material base between said four groups of formpistons and the four groups of formers, and said material base is carried out first rammer, preformed for the first time, the preformed for the second time of dovetail groove screw head and bar portion and the processing of upsetting eventually successively.
According to described processing method, the said first station formpiston comprises:
The first formpiston cover is fixed on the said cold headers;
The first preparatory punch die is arranged in said first formpiston cover, and its top is provided with a cushion block;
Cushion block is provided with a flexible member between the said cushion block and the said first preparatory punch die;
The first preparatory die center is arranged in the said first preset punch die, and its core rod head has a cavity;
The said first station former comprises:
The first former cover is fixed on the said cold headers;
First former is arranged in said first former cover, and its axial line is provided with first cavity impression;
First push rod is arranged in said first cavity impression, and with the said first preparatory die center on same axial line;
First locking device, with the said first former cover locking on said cold headers;
When said material base is carried out the first rammer of dovetail groove screw head and bar portion; Said manipulator is delivered to said material base in the former mouth of said first former; The master slider of said cold headers drives the said first preparatory die center through said cushion block and moves to the said first former direction, and the part material base gets into the first preparatory punch die that extends;
Move to the said first former direction when said master slider continuation, material base is headed in said first cavity impression under the said first preparatory die center effect; The said first preparatory punch die contacts with first former; The said first preparatory punch die forces the compression of said flexible member, and the first preparatory die center is when putting before under said master slider drives, moving forward, under the punching press of the said first preparatory die center; The first station cold-heading semi-finished product are accomplished in said material base upsetting squeeze distortion.
According to described processing method, the said second station formpiston comprises:
The second formpiston cover is fixed on the said cold headers, and its axial line is provided with the cavity in two different apertures that communicate;
The second preparatory punch die is arranged in said second formpiston cover, and its top is connected in the cavity in two different apertures that communicate of said second formpiston cover, and the centre of its die face is provided with the dovetail angle to outer process;
The matrix cover, assembly puts at said second formpiston, and said matrix cover has first through hole;
Matrix has second through hole, and assembly is on first through hole of said matrix cover, and said second through hole is corresponding on said first through hole;
The said second station former comprises:
The second former cover is fixed on the said cold headers;
Second former is arranged in said second former cover, and its axial line is provided with second cavity impression;
Second push rod is arranged in said second cavity impression, and with the said second preparatory punch die on same axial line;
First locking device, with the said second former cover locking on said cold headers;
When the said first station cold-heading semi-finished product being carried out first time preformed; The die orifice of said second former delivered to the said first station cold-heading semi-finished product by said manipulator by the die orifice of said first former; Said cold headers master slider drives the said second preparatory punch die and moves to the said second former direction; Under the effect of the said second preparatory punch die, the half-finished material of the part first station cold-heading is headed into the die orifice of said second former, when said master slider moves forward the most preceding putting; The second station cold-heading semi-finished product are accomplished in said first station cold-heading semi-finished product upsetting squeeze distortion.
According to described processing method, said dovetail angle is 140 degree; The side end face of the said second preparatory punch die is provided with the chamfering that is 10 degree with the top end face of the said second preparatory punch die; And said top end face is provided with steam vent; And/or
The said second preparatory punch die and the said second formpiston inner room are interference fit; Said matrix and matrix inner room adopt prestressing combination cover mode structure;
According to described processing method, said the 3rd station formpiston comprises:
The 3rd formpiston cover is fixed on the said cold headers, and its axial line is provided with cavity;
The 3rd preparatory punch die is arranged in said the 3rd formpiston cover, and its top is connected in the cavity of said the 3rd formpiston cover, and its die face is provided with two projections to outer process;
Said the 3rd station former comprises:
The 3rd former cover is fixed on the said cold headers;
The 3rd former is arranged in said the 3rd former cover, and its axial line is provided with the 3rd cavity impression;
The 3rd push rod is arranged in said the 3rd cavity impression, and with the said the 3rd preparatory punch die on same axial line;
First locking device, with said the 3rd former cover locking on said cold headers;
When the said second station cold-heading semi-finished product being carried out second time preformed; The die orifice of the 3rd former delivered to the second station cold-heading semi-finished product by said manipulator by the die orifice of second former; Said cold headers master slider drives said the 3rd station formpiston and moves to said the 3rd former direction; Under the effect of the said the 3rd preparatory punch die, the part second station cold-heading semifinished material is headed into the die orifice of said the 3rd former, when said master slider moves forward the most preceding putting; The 3rd station cold-heading semi-finished product are accomplished in said second station cold-heading semi-finished product upsetting squeeze distortion.
According to described processing method, said two to the position of projection on the die face of the said the 3rd preparatory punch die of outer process, corresponding to the left and right sides at said dovetail angle, said projection is arc surfaced; The side end face of the said the 3rd preparatory punch die is provided with the chamfering that is 10 degree with the die face top end face of the said the 3rd preparatory punch die;
The said the 3rd preparatory punch die and said the 3rd formpiston inner room adopt interference fit.
According to described processing method, said edger comprises:
The 4th formpiston cover is fixed on the said cold headers, and the axial line of said the 4th formpiston cover is provided with the half-finished discharging opening of said dovetail groove screw, and the side end face of said the 4th formpiston cover is provided with the installing hole of set bolt;
The 4th preparatory punch die is arranged in said the 4th formpiston cover, is connected with said discharging opening; The said the 4th preparatory punch die and said the 4th formpiston cover interconnect fixing through said set bolt;
Said the 4th station former comprises:
The 4th former cover is fixed on the said cold headers;
The 4th former is arranged in said the 4th former cover, and its axial line is provided with the 4th cavity impression;
The 4th push rod is arranged in said the 4th cavity impression, and with said edger on same axial line;
First locking device, with said the 4th former cover locking on said cold headers;
When said the 3rd station cold-heading semi-finished product being carried out upset end; The die orifice of said the 4th former delivered to said the 3rd station cold-heading semi-finished product by said manipulator by the die orifice of said the 3rd former; Said cold headers master slider drives edger and moves to said the 4th former direction, and under the effect of the said the 4th preparatory punch die, said the 3rd station cold-heading semi-finished product are headed into the die orifice of said the 4th former; When said master slider moves forward the most preceding putting; The unnecessary material of the half-finished outer-hexagonal part of said the 3rd station cold-heading is downcut by said edger, and said edger is retreated, and said dovetail groove screw semi-finished product are ejected from said discharging opening by said the 4th push rod.
According to described processing method, said first former is made up of Hardmetal materials and hot die steel two parts interference fit, and said first former cooperates with first former cover gap;
The cross section of said first cavity impression, second cavity impression, the 3rd cavity impression and the 4th cavity impression is rounded, and size is confirmed according to the processing dimension of the bar portion of said dovetail groove screw;
The half-finished head of the said first station cold-heading is the spheroidal that both ends of the surface are the plane, and its bar portion is column type, and has the step of connection between said head and the bar portion;
Offer dovetail groove on the end face of the half-finished head of the said second station cold-heading, the end face of its bar portion is offered the dovetail angle;
On the end face of the half-finished head of said the 3rd station cold-heading dovetail groove about offer the cabochon groove, its bar portion is of a size of the base footpath before the thread rolling;
The half-finished head of said dovetail groove screw is die-cut into the outer-hexagonal of dovetail groove screw head.
In order to realize another goal of the invention of the present invention, the present invention also provides a kind of cold-heading mould that is used for the dovetail groove screw of above-mentioned any described processing method.
The present invention comprises wire rod-cold-heading-heat treatment-thread rolling-surface treatment-packing to the process of dovetail groove screw, owing to adopt multi-station cold-heading to accomplish the processing of dovetail groove, the relative dimensions precision of dovetail groove screw meets fully requirement is set.And after adopting cold-heading processing, the working (machining) efficiency of the dovetail groove of dovetail groove screw is high, main production process cold-heading, and its production efficiency >=80PCS/min, and do not have the waste material generation.Owing to adopted no cut; The resultant metal streamline is continuous; The fatigue strength at the dovetail groove position of product fatigue strength, especially dovetail groove screw is high, and the dovetail groove of fundamentally having stopped the dovetail groove screw is out of shape the unfavorable condition that copper sheet comes off, starter can't start that causes to be taken place; And greatly reduce the production cost, its technological utilization prospect is extensive.
Description of drawings
Fig. 1 is the processing method flow chart of dovetail groove screw provided by the invention;
Fig. 2 A is the structural representation of the first station formpiston provided by the invention;
Fig. 2 B is the first station cold-heading preformed sketch map provided by the invention;
Fig. 3 A is the second station cold-heading preformed sketch map provided by the invention;
Fig. 3 B is the structural representation of the provided by the invention second preparatory punch die;
Fig. 4 A is the 3rd a station cold-heading preformed sketch map provided by the invention;
Fig. 4 B is the structural representation of the provided by the invention the 3rd preparatory punch die;
Fig. 4 C is the enlarged drawing at the 3rd preparatory punch die E place among Fig. 4 B;
Fig. 5 is the 4th a station cold-heading preformed sketch map provided by the invention;
Fig. 6 is the structural representation of the turned blank of dovetail groove screw provided by the invention;
Fig. 7 is the half-finished structural representation of the first station cold-heading provided by the invention;
Fig. 8 is the half-finished structural representation of the second station cold-heading provided by the invention;
Fig. 9 is the half-finished structural representation of the 3rd station cold-heading provided by the invention;
Figure 10 A is the half-finished structural representation of dovetail groove screw provided by the invention;
Figure 10 B is the half-finished left view of dovetail groove screw provided by the invention;
Figure 10 C is the half-finished cutaway view of dovetail groove screw provided by the invention;
Figure 11 is the processing sketch map of thread rolling operation in the one embodiment of the invention.
The specific embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further elaborated below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in qualification the present invention.
Referring to Fig. 1, the invention provides a kind of processing method of dovetail groove screw, said method comprises:
Among the step S101, the said dovetail groove screw 90 required material base line footpath and the used trades mark of processing as required cut material base 901;
Among the step S102, adopt cold headers material base 901 to be processed into cold-heading dovetail groove screw semi-finished product 43 through the cold-heading mould 100 of dovetail groove screw 90; Head 91 moulding of said cold-heading dovetail groove screw semi-finished product 43, its bar portion 92 preformed;
Among the step S103, said cold-heading dovetail groove screw semi-finished product 43 are carried out modified heat treatment;
Among the step S104, the bar portion 92 of the said cold-heading dovetail groove screw semi-finished product 43 after the modified heat treatment is carried out thread rolling, the thread-rolling screw moulding obtains dovetail groove screw 90.
Referring to Fig. 6, dovetail groove screw 90 processing methods are comprised the material preparatory process: the rapidoprint to dovetail groove screw 90 is prepared, and can prepare material base 901 according to the concrete dovetail groove screw 90 actual required line footpath and the used trades mark.The cold-heading operation: cold-heading dovetail groove screw semi-finished product 43, i.e. head 91 moulding of dovetail groove screw 90 comprise dovetail groove and 92 preformed of bar portion.Heat treatment step: after the 43 modified heat treatments of cold-heading dovetail groove screw semi-finished product, make dovetail groove screw semi-finished product 43 satisfy screw machinery performance requirement.Be the thread rolling operation at last: to the bar portion 92 thread-rolling screw moulding of dovetail groove screw semi-finished product 43.The thread rolling operation is generally carried out on reciprocating type thread rolling machine, and mould therefor is two screw plates 1,2, fixing, activities, and shown in figure 11, movable screw plate 1 is than fixedly screw plate 2 is longer.Stroke is forward whenever done once in the aspectant installation of the working face of two screw plates, movable screw plate 1 under external force, and the direction of motion as shown in Figure 11 just at a part, promptly squeezes out screw thread on the thread billet dia.Be surface treatment procedure then: the surface anticorrosive performance and the appearance requirement that satisfy product.At last dovetail groove screw 90 is always examined and packed, detect size, qualified back packing, delivery according to technology.
In one embodiment of the invention, outer-hexagonal dovetail groove screw 90 except that outer-hexagonal part, employing be that not have cutting cold extrusion shaped.So when carrying out technological design,, at first product materials is calculated accurately, confirm the diameter of product technology materials then, and calculate the volume and the bar portion 92 materials length of head 91 materials of dovetail groove screw 90 in conjunction with outer-hexagonal waste material consumption situation.According to the key elements such as structure of product, connecting shaping station number reasonably distributes the deflection of each station again, confirms the technological parameter of each station die cavity, confirms the cavity dimension of each station mould at last according to technological parameter.
Referring to Fig. 2 A～Fig. 6, in the one embodiment of the invention, cold-heading mould 100 comprises:
Four groups of formpistons comprise first, second, third station formpiston and edger 10,20,30,40;
Four groups of formers comprise respectively the first, second, third and four station former 50,60,70,80 corresponding with said first, second, third station formpiston and edger 10,20,30,40;
Four groups of formpistons and four groups of formers are fixed on the cold headers; And the manipulator through said cold headers is displaced into said material base 901 between said four groups of formpistons and the four groups of formers, and material base 901 is carried out first rammer, preformed for the first time, the preformed for the second time of dovetail groove screw head 91 and bar portion 92 and the processing of upsetting eventually successively.
In the present invention; Dovetail groove screw 90 utilizes the processing of cold-heading technology totally to be divided into head moulding (comprising the moulding of dovetail groove) and the preformed of bar portion; Need four stations altogether, promptly comprise the first station formpiston 10 and first station former 50, the second station formpistons 20 corresponding and the second station former 60 corresponding with it with it; The 3rd station formpiston 30 and the three station former 70 corresponding, edger 40 and the four station former 80 corresponding with it with it.
Adopt cold-heading mould 100 processing dovetail groove screws 90 at first according to the size of the material base 901 of the size calculating needs of the dovetail groove screw 90 of required processing; Then through the blank station: utilize and shear, raw material are cut off to cold-heading from the disk material processed needed material base 901.
Referring to Fig. 2 A and Fig. 2 B, in one embodiment of the invention, the first station formpiston 10 comprises:
The first preparatory punch die 12 is arranged in first formpiston cover 11, and its top is provided with a cushion block 13;
The first preparatory die center 15 is arranged in the first preset punch die 12, and its core rod head has a cavity 151;
The first station former 50 comprises:
First former cover 51 is fixed on the said cold headers;
First former 52 is arranged in first former cover 51, and its axial line is provided with first cavity impression 521;
First locking device 54 is locked at first former cover 51 on the said cold headers;
When said material base 901 being carried out the first rammer of dovetail groove screw head 91 and bar portion 92; Said manipulator is delivered to said material base 901 in the former mouth of first former 52; The master slider of said cold headers drives the first preparatory die center 15 through cushion block 13 and moves to first former, 52 directions, and part material base 901 gets into the first preparatory punch die 12 that extends;
When said master slider continues to move to first former, 52 directions, material base 901 is under first preparatory die center 15 effects, and quilt is headed in first cavity impression 521; The first preparatory punch die 12 contacts with first former 52; The first preparatory punch die 12 forces flexible member 14 compression, and the first preparatory die center 15 is when putting before under said master slider drives, moving forward, under the punching press of the first preparatory die center 15; The first station cold-heading semi-finished product 16 are accomplished in said material base 901 upsetting squeezes distortion.As shown in Figure 7, the head 91 of the first station cold-heading semi-finished product 16 is the spheroidal that both ends of the surface are the plane, and its bar portion 92 is column type, and has the step of connection 97 between head 91 and the bar portion 92.
In this embodiment, the preparatory punch die 12 employing activity fabricated structures of first station are out of shape the preparatory punch die 12 of preceding first station and under the effect of flexible member 14, are stretched out forward, are fixed on the front end that limits scope of activities; First former 52 adopts prestressing combination cover mode structure; Form by Hardmetal materials G50 and hot die steel H13 interference fit; First former 52 is made up of Hardmetal materials and hot die steel two parts interference fit; And first former 52 and 51 in first former cover adopt matched in clearance, and gap width is about 0.02mm.The first preparatory punch die 12 is fixed on the cold headers through first formpiston cover 11, and first former 52 is fixed on the cold headers motionless through locking type first former cover 51.In addition, when blank 901 two ends have been fixed on the same central axis of the first preparatory punch die 12 and first former 52, manipulator opens abdicates the space, and the first preparatory punch die 12 is contacted with first former 52.
This station is just to upset, and the manipulator of cold headers is sent to first station to technological requirement by the material base 901 that the blank station cuts.Under the push effect of first station, the first station formpiston 10, get into the first station former 50; In the first station formpiston 10, carry out the semi-hermetic type forward extrusion; Extruding through the first station formpiston 10; Dovetail groove screw head 91 is accomplished pre-profiling by technological requirement, the extremely predetermined process of its bar portion 92 jumping-up under the extruding of the first station formpiston 10.First locking device 54 can be a locking nut.
Referring to Fig. 3 A and Fig. 3 B, the second station formpiston 20 comprises:
Second formpiston cover 21 is fixed on the said cold headers, and its axial line is provided with the cavity 211 in two different apertures that communicate;
The second preparatory punch die 22 is arranged in second formpiston cover 21, and its top is connected in the cavity 211 in two different apertures that communicate of second formpiston cover 21, and the centre of its die face is provided with the dovetail angle 221 to outer process;
Matrix cover 23, assembly are on second formpiston cover 21, and matrix cover 23 has first through hole;
Matrix 24 has second through hole, and assembly is on first through hole of matrix cover 23, and said second through hole is corresponding on said first through hole;
The second station former 60 comprises:
Second former cover 61 is fixed on the said cold headers;
Second former 62 is arranged in second former cover 61, and its axial line is provided with second cavity impression 621;
Second push rod 63 is arranged in second cavity impression 621, and with the second preparatory punch die 22 on same axial line;
First locking device 54 is locked at second former cover 61 on the said cold headers;
When the said first station cold-heading semi-finished product 16 being carried out first time preformed; The die orifice of second former 62 delivered to the said first station cold-heading semi-finished product 16 by said manipulator by the die orifice of said first former 52; Said cold headers master slider drives the second preparatory punch die 22 and moves to second former, 62 directions; Under the effect of the second preparatory punch die 22, the material of the part first station cold-heading semi-finished product 16 is headed into the die orifice of second former 62, when said master slider moves forward the most preceding putting; The second station cold-heading semi-finished product 25 are accomplished in the said first station cold-heading semi-finished product, 16 upsetting squeezes distortion.As shown in Figure 8, offer dovetail groove 93 on the end face of the head 91 of the second station cold-heading semi-finished product 25, the end face of its bar portion 92 is offered dovetail angle 94, and chamfering 95.
In this embodiment, the dovetail angle is 140 degree; The side end face of the second preparatory punch die 22 is provided with the chamfering 223 that is 10 degree with the top end face 222 of the second preparatory punch die 22; And top end face 222 is provided with steam vent 224; And/or
The second preparatory punch die 22 and 21 in second formpiston cover are interference fit; Matrix 24 and 23 in matrix cover adopt prestressing combination cover mode structure;
The second station formpiston 20 adopts fabricated structure, is fixed on the cold headers through second formpiston cover 21, and wherein 23 in the second preparatory punch die 22 and matrix cover adopts interference fit; Matrix 24 and 23 in matrix cover adopt prestressing combination cover mode structure, are promptly formed by Hardmetal materials G50 and hot die steel H13 interference fit.The female mould structure form of this station, material selection, fit system etc. are all identical with first station, only are that the cavity impression inside dimension is different.The first station cold-heading semi-finished product, 16 two ends have been fixed on the same central axis of the second preparatory punch die 22 and second former 62; Manipulator opens abdicates the space; Because when master slider is still put before moving forward to; The first station cold-heading semi-finished product 16 are in bigger axial normal pressure and radially accomplish the distortion of second station under the tension effect, promptly form the second station cold-heading semi-finished product 25.
Said process belongs to second station of cold-heading mould 100 processing, and this station is 90 preformed of dovetail groove screw, is the crucial station of the dovetail groove moulding of dovetail groove screw 90 heads 91.Manipulator is sent to second station to the first station product of producing by technological requirement.Through this station; Material adopts the open type Compound Extrusion to accomplish the cold-heading preformed of dovetail groove 93 groove internal diameters and the cold-heading molding of head 91 external diameters in formpiston; Make the geomery of head 91 meet the requirement of technological design; Ready for the final molding of next station dovetail groove 93, also be simultaneously that head 91 outer-hexagonals of the 4th station dovetail groove screw 90 are die-cut ready.Bar portion 92 adopts forward extrusion, makes bar portion 92 jumping-ups to predetermined process, accomplishes the chamfering 95 of bar portion 92 ends and the moulding of pit 94 simultaneously.
Referring to Fig. 4 A～Fig. 4 C, in one embodiment of the invention, the 3rd station formpiston 30 comprises:
The 3rd formpiston cover 31 is fixed on the said cold headers, and its axial line is provided with cavity 311;
The 3rd preparatory punch die 32 is arranged in the 3rd formpiston cover 31, and its top is connected in the cavity 311 of the 3rd formpiston cover 31, and its die face 321 is provided with two projections 322 to outer process;
The 3rd station former 70 comprises:
The 3rd former cover 71 is fixed on the said cold headers;
The 3rd former 72 is arranged in the 3rd former cover 71, and its axial line is provided with the 3rd cavity impression 721;
The 3rd push rod 73 is arranged in the 3rd cavity impression 721, and with the 3rd preparatory punch die 32 on same axial line;
First locking device 54 is locked at the 3rd former cover 71 on the said cold headers;
When the second station cold-heading semi-finished product 25 being carried out second time preformed; The die orifice of the 3rd former 72 delivered to the second station cold-heading semi-finished product 25 by said manipulator by the die orifice of second former 62; Said cold headers master slider drives the 3rd station formpiston 30 and moves to the 3rd former 72 directions; Under the effect of the said the 3rd preparatory punch die 32, the part second station cold-heading semi-finished product 25 materials are headed into the die orifice of the 3rd former 72, when said master slider moves forward the most preceding putting; The 3rd station cold-heading semi-finished product 33 are accomplished in the second station cold-heading semi-finished product, 25 upsetting squeezes distortion.As shown in Figure 9, on the end face of the head 91 of the 3rd station cold-heading semi-finished product 33 dovetail groove 93 about offer cabochon groove 96, its bar portion 92 is of a size of the base footpath before the thread rolling.
In this embodiment, two to the position of projection 322 on the die face 321 of the 3rd preparatory punch die 32 of outer process, and corresponding to the left and right sides at said dovetail angle, projection 322 is arc surfaced; The side end face of the 3rd preparatory punch die 32 is provided with the chamfering 324 that is 10 degree with die face 321 top end faces 323 of the 3rd preparatory punch die 32; The 3rd preparatory punch die 32 and 31 interference fit of the 3rd formpiston cover;
In addition, the 3rd station formpiston 30 adopts fabricated structure, is fixed on the cold headers through the 3rd formpiston cover 31, and wherein 31 in the 3rd preparatory punch die 32 and the 3rd formpiston cover adopts interference fit.The female mould structure form of this station, material selection, fit system etc. are all identical with first station, only are that the cavity impression inside dimension is different.Be fixed on the same central axis of the 3rd preparatory punch die 32 and the 3rd former 72 at the second station cold-heading semi-finished product, 25 two ends; Manipulator opens abdicates the space; Because when master slider is still put before moving forward to; The second station cold-heading semi-finished product 25 are in bigger axial normal pressure and radially accomplish the distortion of the 3rd station under the tension effect, promptly form the 3rd station cold-heading semi-finished product 33.
Said process belongs to the 3rd station of cold-heading mould 100 processing, and this station belongs to preformed, also is the final station of product head 91 dovetail grooves 93 moulding, and manipulator is sent to the 3rd station to the first station product of producing by technological requirement.Through this station, material adopts the open type Compound Extrusion to accomplish the final cold-forge forming of dovetail groove 93 in formpiston, offers the requirement that geomery that cabochon groove 96 makes dovetail groove 93 meets technological design at head 91.Bar portion 92 adopts forward extrusion; Make the size of bar portion 92 jumping-ups to final technological requirement; It is the base footpath before bar portion 92 sizes reach the screw thread thread rolling; Treat to be sent to the rolling system that screw thread is accomplished at the thread rolling position after other operations are accomplished, so far, the rammer system process of blank 901 is all accomplished before dovetail groove 93 parts and 92 thread rollings of bar portion.
Referring to Fig. 5, in one embodiment of the invention, edger 40 comprises:
The 4th formpiston cover 41 is fixed on the said cold headers, and the axial line of the 4th formpiston cover 41 is provided with the discharging opening 411 of said dovetail groove screw semi-finished product 43, and the side end face of the 4th formpiston cover 41 is provided with the installing hole of set bolt 412;
The 4th preparatory punch die 42 is arranged in the 4th formpiston cover 41, is connected with discharging opening 411; The 4th preparatory punch die 42 and the 4th formpiston cover 41 interconnect fixing through set bolt 412;
The 4th station former 80 comprises:
The 4th former cover 81 is fixed on the said cold headers;
The 4th former 82 is arranged in the 4th former cover 81, and its axial line is provided with the 4th cavity impression 821;
The 4th push rod 83 is arranged in the 4th cavity impression 821, and with the 4th preparatory punch die 42 on same axial line;
First locking device 54 is locked at the 4th former cover 81 on the said cold headers;
When said the 3rd station cold-heading semi-finished product 33 being carried out upset end; The die orifice of the 4th former 82 delivered to said the 3rd station cold-heading semi-finished product 33 by said manipulator by the die orifice of the 3rd former 72; Said cold headers master slider drives the 4th preparatory punch die 42 and moves to the 4th former 82 directions, and under the effect of the 4th preparatory punch die 42, the 3rd station cold-heading semi-finished product 33 are headed into the die orifice of the 4th former 82; When said master slider moves forward the most preceding putting; The unnecessary material of the outer-hexagonal part of the 3rd station cold-heading semi-finished product 33 is downcut by edger 40, and edger 40 is retreated, and dovetail groove screw semi-finished product 43 are ejected from discharging opening 411 by the 4th push rod 83.
Said process belongs to the 4th station of cold-heading mould 100 processing, and edger 40 adopts fabricated structure, is fixed on the cold headers through the 4th formpiston cover 41, and wherein the 4th preparatory punch die 42 and the 4th formpiston cover 41 interconnects fixing through set bolt 412.The female mould structure form of this station, material selection, fit system etc. are all identical with first station, only are that the cavity impression inside dimension is different.In addition, be fixed at the 3rd station cold-heading semi-finished product 33 two ends on the same central axis of the 4th preparatory punch die 42 and the 4th former 82, manipulator opens abdicates the space; Because master slider is still forward; When moving to the most preceding putting, the unnecessary material of outer-hexagonal part is downcut by edger 40, and the 4th preparatory punch die 42 shrinks back subsequently; Dovetail groove screw semi-finished product 43 eject under the effect of the 4th push rod 83 ejecting forces, and unnecessary waste material also waste outlet 412 directions falls down entering waste material material road.
Said process belongs to the 4th station of cold-heading mould 100 processing, and this station is whole rammer station, is the crucial station of head 91 outer-hexagonal moulding.Manipulator is sent to the 4th station to the 3rd station cold-heading semi-finished product of producing by technological requirement 33, accomplishes the die-cut of outer-hexagonal by the hexagonal formpiston, with the excision of the waste material around the outer-hexagonal, accomplishes the moulding of outer-hexagonal.So far, the head 91 of outer-hexagonal dovetail groove screw 90 is all accomplished with the rammer system process of the preceding blank of bar portion 92 thread rollings.Shown in Figure 10 A～Figure 10 C, the head 91 of dovetail groove screw semi-finished product 43 is die-cut into the outer-hexagonal of dovetail groove screw head 91.
In above-mentioned a plurality of embodiment, the cross section of first cavity impression 521, second cavity impression 621, the 3rd cavity impression 721 and the 4th cavity impression 821 is rounded, and its size is confirmed according to the processing dimension of the bar portion 92 of said dovetail groove screw 90;
In order to realize another goal of the invention of the present invention, the present invention also provides a kind of cold-heading mould 100 that is used for the dovetail groove screw of above-mentioned processing method; The concrete structure of this cold-heading mould 100 has had description in above-mentioned a plurality of embodiment, repeat no more at this.
In sum, the present invention comprises wire rod-cold-heading-heat treatment-thread rolling-surface treatment-packing to the process of dovetail groove screw, owing to adopt multi-station cold-heading to accomplish the processing of dovetail groove, the relative dimensions precision of dovetail groove screw meets fully requirement is set.And after adopting cold-heading processing, the working (machining) efficiency of the dovetail groove of dovetail groove screw is high, main production process cold-heading, and its production efficiency >=80PCS/min, and do not have the waste material generation.Owing to adopted no cut; The resultant metal streamline is continuous; The fatigue strength at the dovetail groove position of product fatigue strength, especially dovetail groove screw is high, and the dovetail groove of fundamentally having stopped the dovetail groove screw is out of shape the unfavorable condition that copper sheet comes off, starter can't start that causes to be taken place; And greatly reduce the production cost, its technological utilization prospect is extensive.
Certainly; The present invention also can have other various embodiments; Under the situation that does not deviate from spirit of the present invention and essence thereof; Those of ordinary skill in the art work as can make various corresponding changes and distortion according to the present invention, but these corresponding changes and distortion all should belong to the protection domain of the appended claim of the present invention.
Claims (10)
1. the processing method of a dovetail groove screw is characterized in that, said method comprises:
The required material base line footpath and the used trade mark of the said dovetail groove screw of processing cuts said material base as required;
Adopt cold headers said material base to be processed into cold-heading dovetail groove screw semi-finished product through the cold-heading mould of said dovetail groove screw; The half-finished head moulding of said cold-heading dovetail groove screw, its bar portion preformed;
Said cold-heading dovetail groove screw semi-finished product are carried out modified heat treatment;
The half-finished bar of said cold-heading dovetail groove screw portion after the modified heat treatment is carried out thread rolling, and the thread-rolling screw moulding obtains said dovetail groove screw.
2. processing method according to claim 1 is characterized in that, said cold-heading mould comprises:
Four groups of formpistons comprise first, second, third station formpiston and edger;
Four groups of formers comprise respectively and said first, second, third station formpiston and the first, second, third and the 4th corresponding station former of edger;
Said four groups of formpistons and four groups of formers are fixed on the cold headers; And the manipulator through said cold headers is displaced into said material base between said four groups of formpistons and the four groups of formers, and said material base is carried out first rammer, preformed for the first time, the preformed for the second time of dovetail groove screw head and bar portion and the processing of upsetting eventually successively.
3. processing method according to claim 1 is characterized in that, the said first station formpiston comprises:
The first formpiston cover is fixed on the said cold headers;
The first preparatory punch die is arranged in said first formpiston cover, and its top is provided with a cushion block;
Cushion block is provided with a flexible member between the said cushion block and the said first preparatory punch die;
The first preparatory die center is arranged in the said first preset punch die, and its core rod head has a cavity;
The said first station former comprises:
The first former cover is fixed on the said cold headers;
First former is arranged in said first former cover, and its axial line is provided with first cavity impression;
First push rod is arranged in said first cavity impression, and with the said first preparatory die center on same axial line;
First locking device, with the said first former cover locking on said cold headers;
When said material base is carried out the first rammer of dovetail groove screw head and bar portion; Said manipulator is delivered to said material base in the former mouth of said first former; The master slider of said cold headers drives the said first preparatory die center through said cushion block and moves to the said first former direction, and the part material base gets into the first preparatory punch die that extends;
Move to the said first former direction when said master slider continuation, material base is headed in said first cavity impression under the said first preparatory die center effect; The said first preparatory punch die contacts with first former; The said first preparatory punch die forces the compression of said flexible member, and the first preparatory die center is when putting before under said master slider drives, moving forward, under the punching press of the said first preparatory die center; The first station cold-heading semi-finished product are accomplished in said material base upsetting squeeze distortion.
4. processing method according to claim 3 is characterized in that, the said second station formpiston comprises:
The second formpiston cover is fixed on the said cold headers, and its axial line is provided with the cavity in two different apertures that communicate;
The second preparatory punch die is arranged in said second formpiston cover, and its top is connected in the cavity in two different apertures that communicate of said second formpiston cover, and the centre of its die face is provided with the dovetail angle to outer process;
The matrix cover, assembly puts at said second formpiston, and said matrix cover has first through hole;
Matrix has second through hole, and assembly is on first through hole of said matrix cover, and said second through hole is corresponding on said first through hole;
The said second station former comprises:
The second former cover is fixed on the said cold headers;
Second former is arranged in said second former cover, and its axial line is provided with second cavity impression;
Second push rod is arranged in said second cavity impression, and with the said second preparatory punch die on same axial line;
First locking device, with the said second former cover locking on said cold headers;
When the said first station cold-heading semi-finished product being carried out first time preformed; The die orifice of said second former delivered to the said first station cold-heading semi-finished product by said manipulator by the die orifice of said first former; Said cold headers master slider drives the said second preparatory punch die and moves to the said second former direction; Under the effect of the said second preparatory punch die, the half-finished material of the part first station cold-heading is headed into the die orifice of said second former, when said master slider moves forward the most preceding putting; The second station cold-heading semi-finished product are accomplished in said first station cold-heading semi-finished product upsetting squeeze distortion.
5. processing method according to claim 4 is characterized in that, said dovetail angle is 140 degree; The side end face of the said second preparatory punch die is provided with the chamfering that is 10 degree with the top end face of the said second preparatory punch die; And said top end face is provided with steam vent; And/or
The said second preparatory punch die and the said second formpiston inner room are interference fit; Said matrix and matrix inner room adopt prestressing combination cover mode structure.
6. processing method according to claim 4 is characterized in that, said the 3rd station formpiston comprises:
The 3rd formpiston cover is fixed on the said cold headers, and its axial line is provided with cavity;
The 3rd preparatory punch die is arranged in said the 3rd formpiston cover, and its top is connected in the cavity of said the 3rd formpiston cover, and its die face is provided with two projections to outer process;
Said the 3rd station former comprises:
The 3rd former cover is fixed on the said cold headers;
The 3rd former is arranged in said the 3rd former cover, and its axial line is provided with the 3rd cavity impression;
The 3rd push rod is arranged in said the 3rd cavity impression, and with the said the 3rd preparatory punch die on same axial line;
First locking device, with said the 3rd former cover locking on said cold headers;
When the said second station cold-heading semi-finished product being carried out second time preformed; The die orifice of the 3rd former delivered to the second station cold-heading semi-finished product by said manipulator by the die orifice of second former; Said cold headers master slider drives said the 3rd station formpiston and moves to said the 3rd former direction; Under the effect of the said the 3rd preparatory punch die, the part second station cold-heading semifinished material is headed into the die orifice of said the 3rd former, when said master slider moves forward the most preceding putting; The 3rd station cold-heading semi-finished product are accomplished in said second station cold-heading semi-finished product upsetting squeeze distortion.
7. processing method according to claim 6 is characterized in that, said two to the position of projection on the die face of the said the 3rd preparatory punch die of outer process, corresponding to the left and right sides at said dovetail angle, said projection is arc surfaced; The side end face of the said the 3rd preparatory punch die is provided with the chamfering that is 10 degree with the die face top end face of the said the 3rd preparatory punch die;
The said the 3rd preparatory punch die and said the 3rd formpiston inner room adopt interference fit.
8. processing method according to claim 6 is characterized in that, said edger comprises:
The 4th formpiston cover is fixed on the said cold headers, and the axial line of said the 4th formpiston cover is provided with the half-finished discharging opening of said dovetail groove screw, and the side end face of said the 4th formpiston cover is provided with the installing hole of set bolt;
The 4th preparatory punch die is arranged in said the 4th formpiston cover, is connected with said discharging opening; The said the 4th preparatory punch die and said the 4th formpiston cover interconnect fixing through said set bolt;
Said the 4th station former comprises:
The 4th former cover is fixed on the said cold headers;
The 4th former is arranged in said the 4th former cover, and its axial line is provided with the 4th cavity impression;
The 4th push rod is arranged in said the 4th cavity impression, and with said edger on same axial line;
First locking device, with said the 4th former cover locking on said cold headers;
When said the 3rd station cold-heading semi-finished product being carried out upset end; The die orifice of said the 4th former delivered to said the 3rd station cold-heading semi-finished product by said manipulator by the die orifice of said the 3rd former; Said cold headers master slider drives edger and moves to said the 4th former direction, and under the effect of the said the 4th preparatory punch die, said the 3rd station cold-heading semi-finished product are headed into the die orifice of said the 4th former; When said master slider moves forward the most preceding putting; The unnecessary material of the half-finished outer-hexagonal part of said the 3rd station cold-heading is downcut by said edger, and said edger is retreated, and said dovetail groove screw semi-finished product are ejected from said discharging opening by said the 4th push rod.
9. processing method according to claim 7 is characterized in that, said first former is made up of Hardmetal materials and hot die steel two parts interference fit, and said first former cooperates with first former cover gap;
The cross section of said first cavity impression, second cavity impression, the 3rd cavity impression and the 4th cavity impression is rounded, and size is confirmed according to the processing dimension of the bar portion of said dovetail groove screw;
The half-finished head of the said first station cold-heading is the spheroidal that both ends of the surface are the plane, and its bar portion is column type, and has the step of connection between said head and the bar portion;
Offer dovetail groove on the end face of the half-finished head of the said second station cold-heading, the end face of its bar portion is offered the dovetail angle;
On the end face of the half-finished head of said the 3rd station cold-heading dovetail groove about offer the cabochon groove, its bar portion is of a size of the base footpath before the thread rolling;
The half-finished head of said dovetail groove screw is die-cut into the outer-hexagonal of dovetail groove screw head.
10. cold-heading mould that is used for the dovetail groove screw of any described processing method of claim 1～9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201110354433.3A CN102501021B (en) | 2011-11-10 | 2011-11-10 | Machining method for screws of dovetail grooves and cold-upsetting die of machining method |
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| CN201110354433.3A CN102501021B (en) | 2011-11-10 | 2011-11-10 | Machining method for screws of dovetail grooves and cold-upsetting die of machining method |
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| CN102501021A true CN102501021A (en) | 2012-06-20 |
| CN102501021B CN102501021B (en) | 2014-01-08 |
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| CN104117624B (en) * | 2014-05-07 | 2017-04-19 | 卓越紧固系统（上海）有限公司 | Cold heading manufacturing method for connection bolt of ignition switch and die |
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