Please refer to shown in Figure 1ly, it is a kind of schematic diagram of cutting pick boot forging, and 110 is the large end of tooth boots forging, and 120 is the small end of tooth boots forging.Cutting pick boot is used for mining machine, particularly coal mining mechanically, supports the use with pick, and be coal-winning machine, a large amount of a kind of easily-consumed products that use on the development machine.Cutting pick boot easily damages, and has increased the replacing number of times of part on the equipment, has reduced production efficiency, has also increased cost simultaneously.The tooth boots machining cycle is long, and consumptive material is many, and product strength is low, rapid wear.At present, manufacturing firm all adopts inner chamber precision forging blank technology both at home and abroad, and its efficient is high, cost is low.
The conventional Forging Technology of processing cutting pick boot comprises: blanking, and base, ball blast, coating, heating, jumping-up, punching, ball blast, coating, heating, just crowded, be shaped, anneal and get length.Please refer to shown in Fig. 2 (a)-2 (f) the change of shape procedure chart of the tooth boots product that it obtains for the Forging Technology that adopts above-mentioned cutting pick boot.Wherein, the shape of product that Fig. 2 (a) obtains for blanking procedure, the shape of product that Fig. 2 (b) obtains for the jumping-up operation, the shape of product that Fig. 2 (c) obtains for the punching operation, Fig. 2 (d) is for just squeezing the shape of product that operation obtains, the shape of product that Fig. 2 (e) obtains for forming process, Fig. 2 (f) is for getting the shape of product that farm labourer's order obtains.
Punching operation consumptive material in the above-mentioned technique is many, and the punching die design is complicated, and the hole precision of going out is low, needs the precision in following process guarantee hole.
Please refer to shown in Figure 3ly, it is for just squeezing the positive extruding mold that uses in the operation.This positive extruding mold comprises drift cover 310, drift 320, counterdie 330, stripping attachment 340.Drift 320 is the integral type drift, and its end diameter D1 is much smaller than outside diameter D2, and does not have round-corner transition at position A place.In the forward extrusion process, the large end of drift is subjected to downward active force, and the active force that makes progress that the drift small end is given by blank 350, because A place, position does not have round-corner transition, effect low punch 320 two kinds of power easily produces fracture, therefore need in process of production in time to change drift, reduced production efficiency.Simultaneously, because the guiding accuracy of drift 320 is not high, the Product Precision after the forging is low, affects the carrying out of forming process.
Therefore, be necessary to propose a kind of improved technical scheme and solve the problems referred to above.
For above-mentioned purpose of the present utility model, feature and advantage can be become apparent more, below in conjunction with the drawings and specific embodiments the utility model is described in further detail.
Alleged " embodiment " or " embodiment " refer to be contained in special characteristic, structure or the characteristic at least one implementation of the utility model herein.Different local in this manual " in one embodiment " that occur not are all to refer to same embodiment, neither be independent or the embodiment mutually exclusive with other embodiment optionally.
The utility model adopts plug drift and drift fairlead is fitted in a combination upper punch structure; when the cylinder blank with penetrating endoporus is carried out forward extrusion; reduce the pressure of plug drift; make not frangibility of plug drift; effectively protect the service life of upper punch assembly; raise the efficiency, reduce cost.
The utility model adopts anti-squeezing with drilling operating to replace direct punching operation, after blanking, annealing, utilize anti-extruding mold that blank is carried out backward extrusion, hole by machining after anti-the squeezing, guarantee blank endoporus axiality to foreign round, thereby guarantee the Product Precision of tooth boots forging, reduce simultaneously spillage of material, reduce cost.
Please refer to shown in Figure 4ly, it is the forging method process chart in one embodiment of the utility model cutting pick boot forging.Described technological process comprises the steps.
Step 410, blanking.
Described blanking is adjusted cutting length for selecting suitable bar, with Weight control in predefined scope.
Step 420, jumping-up.
Described jumping-up is bar material baiting to be put into mould carry out jumping-up, to obtain cylinder blank.
Step 430, anti-squeezing.
The described anti-die cavity that squeezes as described blank being put into anti-extruding mold carries out backward extrusion has the tubbiness endoporus with formation cylinder blank, owing to being at the die cavity internal shaping, therefore can guarantee blank endoporus axiality to foreign round.Because the anti-metal material that squeezes endoporus forms tubbiness by flowing, therefore low many of the thickness of the direct punching of bucket end Thickness Ratio of described blank have reduced spillage of material.
Step 440, boring.
Described boring is that endoporus direction along described blank is carried out machining boring at the bottom of to bucket, the cylinder blank that has penetrating endoporus with formation, and gradient a (described gradient is the angle of endoporus central shaft and endoporus side) is reserved in the aperture at the cylinder blank with penetrating endoporus, is convenient to the follow-up operation of just squeezing and leads.
Through sunykatuib analysis, in described drilling operating, when the aperture of the cylinder blank with penetrating endoporus reservation gradient a is 3 °, can play the high accuracy guiding to the lower operation of just squeezing together, increase by 1 ° of just crowded middle inner chamber folding, affect size, reduce 1 ° and can not play guide effect again, therefore, in a preferred embodiment, it is 3 ° that gradient a is reserved in the aperture of the cylinder blank with penetrating endoporus that obtains at drilling operating.
Step 450, just crowded.
Described just squeezing pushed for described cylinder blank with penetrating endoporus is put into positive extruding mold, with two hollow circular cylinders forming that diameter differs and the forging stock of the changeover portion between them, wherein the hollow circular cylinder of small diameter consists of the small end of cutting pick boot.
Step 460, shaping.
The described changeover portion that utilizes between two hollow circular cylinders that mould differs to the large footpath hollow circular cylinder in the described forging stock and diameter that is configured as pushes, and forms the large end of cutting pick boot, thereby forms forging.The large end of described cutting pick boot is that the longitudinal section is the trapezoidal of hollow.
Step 470, get length.
The described length of getting makes product reach drawing requirement for to described forging intercepted length.
Wherein, after step 410 blanking, also comprise base, ball blast, coating, heating process before step 420 jumping-up.
After step 440 boring, step 450 also comprises ball blast, coating, heating process before just squeezing.
Step 470 also comprises the temperature control refrigerating work procedure before getting length after step 460 is shaped,
Described temperature control is cooled to and adopts temperature control furnace that forging is cooled off, compares with conventional annealing, and annealing cycle shortening greatly, thus enhance productivity, reduce cost.
In sum, the forging method of cutting pick boot forging of the present utility model is compared its difference with the Forging Technology of existing cutting pick boot forging and is, adopt anti-squeezing with drilling operating to replace direct punching operation, after blanking, annealing, utilize anti-extruding mold that blank is carried out backward extrusion, guarantee forming blank endoporus axiality to foreign round, utilize machining boring after anti-the squeezing, reduce spillage of material, and after boring, leave 3 ° gradient in the aperture, lead when just squeezing operation together down, to play high accuracy, thus the Product Precision of assurance tooth boots forging.
Please refer to shown in Figure 5ly, it is to utilize the positive extruding mold in the utility model just squeezing the product shaping procedure chart of operation.
Positive extruding mold among the figure comprises the upper punch assembly, forms the counterdie 510 of lower mode cavity and from the upwardly extending stripping attachment 520 of lower mode cavity,
Described upper punch assembly comprises plug drift 530 and the drift fairlead 540 that is sheathed on plug drift periphery, and plug drift 530 extends described drift fairlead 540.Also can say, described plug drift 530 and described drift fairlead 540 fit in a combination upper punch structure.
Next introduce in detail the process of utilizing positive extruding mold just squeezing.Described cylinder blank 550 with penetrating endoporus is put into lower mode cavity.Described upper punch assembly moves downward, plug drift 530 is introduced in the endoporus of blank 550, proofread and correct the blank position, and the predetermined length H that plug drift 530 extends described drift fairlead 540 be blank 550 length h 2.5-3 doubly, after so just crowded operation is finished, described plug drift 530 is understood some outside the forging stock lower port, guarantees that forging stock can not produce the phenomenon that lower port inside contracts in extrusion process.Then drift fairlead 540 moves downward with blank 550 and contacts and extrusion billet, just squeezes, and when drift fairlead 540 contact blank 550, the length that drift fairlead 540 enters counterdie 510 is L, carries out guide effect.When just squeezing when finishing, the end of plug drift 530 exceeds the aperture, lower end 560 of just squeezing the operation forging stock, and and the stripping attachment 520 of counterdie bottom in ejector beam between leave gap b, general b is 2-4mm.
Because described upper punch assembly is split type structure; it is it drift fairlead 540 that comprises plug drift 530 and be sheathed on plug drift periphery; utilize drift fairlead 540 contact blanks 550 to push; reduce the pressure of plug drift 530; make not frangibility of plug drift 530; effectively protect the service life of upper punch assembly; and the upper punch assembly after cooperating utilizes drift fairlead 540 and counterdie 510 to carry out guiding by mould orifice; effectively raise the precision of product; the issuable problem of follow-up forging is reduced; also reduce the die change number of times, raise the efficiency, reduce cost.
Please refer to shown in Fig. 6 (a)-6 (g), it is the utility model shape of product change procedure figure in one embodiment.The shape of product that Fig. 6 (a) obtains for blanking procedure; The shape of product that Fig. 6 (b) obtains for the jumping-up operation; The shape of product that Fig. 6 (c) obtains for anti-crowded operation; The shape of product that Fig. 6 (d) obtains for drilling operating; Fig. 6 (e) is for just squeezing the shape of product that operation obtains; The shape of product that Fig. 6 (f) obtains for forming process; For to get the shape of product that farm labourer's order obtains, a is the aperture gradient with cylinder blank of penetrating endoporus to Fig. 6 (g).
The aperture of the product that anti-crowded operation obtains is designated as d1, this aperture also can be called as the anti-aperture d1 of squeezing, the aperture of the product that just crowded operation obtains is designated as d2, this aperture also can be called just squeezes aperture d2, the pass of the anti-aperture d1 of squeezing and just crowded aperture d2 is: 0＜instead squeezes aperture d1-is just squeezing aperture d2≤0.1mm, anti-squeezing with just crowded operation mesoporous differs little, because it is bigger instead to squeeze the just crowded aperture of aperture ratio, be convenient to plug drift 530 and can pass through smoothly blank 550, to produce inner chamber folding and can not produce the inner chamber of endoporus and the friction of plug drift.
Principle of the present utility model is to adopt plug drift and drift fairlead are fitted in a combination upper punch structure; utilize the drift fairlead that blank is led and push; reduce the pressure of plug drift; make not frangibility of plug drift, effectively protect the service life of upper punch assembly, and because the guiding by mould orifice effect of drift fairlead can guarantee Product Precision; the issuable problem of follow-up forging is reduced; also reduce the die change number of times, raise the efficiency, reduce cost.
Above-mentioned explanation has fully disclosed the specific embodiment of the present utility model.It is pointed out that and be familiar with the scope that any change that the person skilled in art does the specific embodiment of the present utility model does not all break away from claims of the present utility model.Correspondingly, the scope of claim of the present utility model also is not limited only to previous embodiment.