CN104107897B - The squeeze casting mould of straight tooth column metal gear and casting method thereof - Google Patents

The squeeze casting mould of straight tooth column metal gear and casting method thereof Download PDF

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Publication number
CN104107897B
CN104107897B CN201310132120.2A CN201310132120A CN104107897B CN 104107897 B CN104107897 B CN 104107897B CN 201310132120 A CN201310132120 A CN 201310132120A CN 104107897 B CN104107897 B CN 104107897B
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China
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bed die
mould
patrix
counterdie
gear
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CN201310132120.2A
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Chinese (zh)
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CN104107897A (en
Inventor
杜占军
邢书明
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北京时代锐智科技有限公司
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Publication of CN104107897A publication Critical patent/CN104107897A/en
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Publication of CN104107897B publication Critical patent/CN104107897B/en

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Abstract

The squeeze casting mould of straight tooth column metal gear and an extrusion casting method thereof, wherein mould comprises patrix, middle mould, counterdie, bed die, plate hole core and axis hole core; Patrix, middle mould, counterdie, bed die and axis hole core are coaxially arranged, and middle mould is fixed on the upper end of counterdie, and counterdie is provided with slip inner chamber, and bed die is set within slip inner chamber and sealing is slided within slip inner chamber; Plate hole core and axis hole core arrange and are fixed on bed die, and patrix is provided with the location steam vent corresponding with plate hole core and axis hole core; When patrix and middle mould matched moulds, patrix, middle mould, between counterdie and bed die, surround the cast chamber of sealing; And plate hole core and axis hole core are all inserted in corresponding location steam vent that patrix is arranged.Stock utilization of the present invention is up to 95%; Can work continuously, production efficiency is high; Pollute without antiquated sand, energy-conserving and environment-protective; Gear blank allowance is little, crystal grain is fine and closely woven, mechanical property is good.

Description

The squeeze casting mould of straight tooth column metal gear and casting method thereof
Technical field
The present invention relates to machinery manufacturing technology field, especially relate to a kind of squeeze casting mould and casting method thereof of straight tooth column metal gear.
Background technology
Gear is a strength member conventional in plant equipment, is usually made up of metals such as steel, cast iron or non-ferrous alloys.The gear blank manufacture method of prior art mainly four kinds: casting, forging, round steel cutting stock, extruding.
The gear blank that forging and round steel blanking are formed generally is not with profile of tooth, even disc not to forge yet, and its shape majority just cake, allowance is at more than 4mm, and stock utilization is less than 60%, and processing charges is high.
Solid-state extrusion method produces gear the method that two classes are concrete, and one is hot extrusion, and one is cold extrusion.They have the advantage that production efficiency is high, gear quality is good, but its equipment tonnage is large.Published through hot-extrusion method prepares straight spur gear (application number 03138823.x) by blank heating is reduced resistance of deformation, and pressurize from top, make bar diameter reduce formed gear, achieve the plastic deformation of metal, and directly extrude from bottom.Because its bar diameter is greater than gear blank diameter, so certainly exist clout, stock utilization is not high.And because extruding force is high, the parts of tooth of mould is very easily damaged.The extruding force that extruded type cold extrusion method prepares straight spur gear (application number 200510017621.1) is higher, and when preparing large scale gear, the tonnage of extrusion equipment is high, is difficult to apply.
The gear blank that casting method obtains has had disc, wheel hub, and even axis hole and disc lightening hole also can cast out.Although generally all there is no profile of tooth, also there is large increase than the stock utilization of forging gear.But, because its blank is not with profile of tooth, need follow-up machining to carry out the tooth of formed gear.Such machining cost is high, also creates larger waste of material.Method mainly sand casting and the extrusion casint of cast gear.Because sand casting Gear Processing surplus is excessive, the dense top layer of foundry goods is all machined away, and have impact on the performance of material property.In addition, sand casting gear blank is the contraction carrying out supplementary cooled and solidified process by the rising head under Action of Gravity Field.In order to ensure not having shrink defects, the quality of rising head is close to the quality of gear blank.Rising head large so not only significantly reduces production efficiency, and its cutting, reflow process also can cause huge energy consumption and the scaling loss of material, causes the waste of material.Approximately often produce one ton of gear blank to need to consume 1 ton, molding sand.The use of so a large amount of molding sand, process and recovery cause serious dust pollution, even bring anthraco-silicosis.This sand mould casting method, one has accidentally, just there will be sand holes defect.Therefore, the quality of sand casting gear is low, general only with being used for the not high occasion of performance requirement.Extrusion casting method manufactures gear can obtain toothed gear blank.Prior art discloses mould and the method (application number 200320122261.8 and 200310109211.0) of two extrusion casint gears, its axis hole core is arranged on patrix, molten metal is clamp-oned under upper molding pressure effect, therefore through hole cannot be obtained, stock utilization is still lower, and need to clamp-on molten metal under pressure because this is metal-cored, its life-span is extremely short; Its pressuring method is top pressurization, belong to Direct Squeezing Casting, so pour into liquid level place in mold cavity can occur annular cold shut defects when subsequently extruded before pressurization, the degree of depth can reach 3mm, the direct performance affecting gear, causes the gear of this method manufacture easily to occur broken teeth accident; It requires that patrix enters in counterdie and extrudes, and the matching relationship of teeth portion is difficult to ensure between each upper and lower mould, during extruding, frictional resistance is very large, effective extruding force is significantly reduced, inside workpiece is caused to have shrinkage defect, in a word, the problem that the extrusion casint gear blank of this upper pressurization exists cold shut and shrinkage defect, cannot obtain through axis hole, die life is short.
Summary of the invention
The object of the invention is to the squeeze casting mould and the casting method thereof that design a kind of straight tooth column metal gear, solve the problem.
To achieve these goals, the technical solution used in the present invention is as follows:
A squeeze casting mould for straight tooth column metal gear, comprises patrix, middle mould, counterdie, bed die, plate hole core and axis hole core; Described patrix, described middle mould, described counterdie, described bed die and described axis hole core are coaxially arranged, described middle mould is fixed on the upper end of described counterdie, described counterdie is provided with slip inner chamber, and described bed die is set within described slip inner chamber and sealing is slided within described slip inner chamber; Described plate hole core and described axis hole core arrange and are fixed on described bed die, and described patrix is provided with the location steam vent corresponding with described plate hole core and described axis hole core; When described patrix and described middle mould matched moulds, described patrix, described middle mould, surround the cast chamber of sealing between described counterdie and described bed die, the volume in described cast chamber is by regulating the position of described counterdie to regulate; And described plate hole core and described axis hole core are all inserted in corresponding described location steam vent that described patrix is arranged.
Preferably, also comprise bed die circle, described bed die snare to be located within described slip inner chamber and fixing, and described bed die is set within described bed die circle and sealing is slided within described bed die circle; When described patrix and described middle mould matched moulds, described patrix, described middle mould, described counterdie, between described bed die circle and described bed die, surround the cast chamber of sealing.
Preferably, also comprise lower bolster, pressure ram and collar, described counterdie is arranged on described lower bolster, perforate on described lower bolster, described collar passes the perforate on described lower bolster and is fixed on described counterdie, and described pressure ram is also fixed on described bed die through the perforate on described lower bolster.
Preferably, the shape of the lower surface of described patrix is agreed with mutually with the shape within the scope of the upper surface diameter D2 of gear blank, be the plane with exhaust duct beyond the lower surface D2 scope of described patrix, be provided with the through hole of respective numbers and size at the correspondence position of gear blank plate hole and axis hole; The upper surface of described patrix is plane, and is fixed together with described cope match-plate pattern, is arranged on the movable plate of extrusion casting machine, can be driven and vertically move up and down, movement travel H ~ 1000mm by movable plate;
The upper and lower end face of described middle mould is plane, and thickness equals the thickness H of teeth of gearing blanks, and the central authorities of described middle mould are through holes within the scope of diameter D3; The shape of described through hole is the ring gear be meshed with the teeth portion of gear blank, and is fixed together with described counterdie, is arranged on the workbench of extrusion casting machine by described counterdie and described lower bolster;
Described counterdie is cylindrical shell, upper and lower end face is for being plane, highly equal (2.5 ~ 5.5) H, fit with the lower surface of described middle mould and tighten together in the upper surface of described counterdie, fit with the upper surface of described lower bolster and tighten together in the lower surface of described counterdie, central authorities leave lower large little ladder circular hole, in described ladder circular hole, columniform described bed die circle is installed, the macropore of described ladder circular hole bottom and the ring flange matched in clearance of described bed die circle, fit clearance 0.05 ~ 0.15mm, the aperture on described ladder circular hole top and the outer surface of upper matched in clearance of described bed die circle, matched in clearance 0.1 ~ 0.25mm,
Described bed die is a cylinder, its upper surface shape and gear blank diameter are that the shape within the scope of D2 is agreed with mutually, at the correspondence position of plate hole and axis hole, described plate hole core and described axis hole core are installed, coaxial with described pressure ram, the lower surface of described bed die is plane and is connected and fixed with enforcement pressure ram, can vertically move up and down in described bed die circle under described pressure ram drives, movement travel (1 ~ 2) H, be matched in clearance between the surface in the outer surface of described bed die and described bed die circle, fit clearance 0.1 ~ 0.25mm;
Described bed die circle is the cylinder of bottom with ring flange, the cylindrical matched in clearance of its endoporus and described bed die, fit clearance 0.1 ~ 0.25mm, its outer wall coordinates with the shoulder hole of described counterdie, top fit clearance 0.1 ~ 0.25mm, the ring flange of described bed die circle and the fit clearance of described lower nib are 0.05 ~ 0.15mm, the upper surface outside diameter of described bed die circle equals the root diameter of gear blank, the interior circular diameter of described bed die circle is equal with the D2 of gear blank, the total height of described bed die circle is (2 ~ 5) × H, on the ring flange of described bed die circle, the distance at the step place of plane separation counterdie shoulder hole is movement travel, movement travel is H+1 ~ H+100mm, the lower surface of described bed die circle is connected with described collar, can be driven by the knockout cylinder of extrusion casting machine and move up and down.
Preferably, described plate hole core and described axis hole core hot die steel are made, two sections are cylinder, one section, centre is the round platform with 0.5 ~ 1 ° of tapering, the basal diameter of round platform is identical with the cylindrical diameter of hypomere, and the end face diameter of round platform is identical with the cylindrical diameter of epimere, highly equals the length of corresponding aperture on gear blank, three sections of intersections are without step, and lower surface and bed die are connected firmly.
Apply a casting method for the squeeze casting mould of described straight tooth column metal gear, comprise step as follows:
Step 1, adjustment mould: primer fluid forging machine, bed die circle is made to move to the upper surface of described bed die circle concordant with the upper surface of counterdie, make bed die enter upper surface (1 ~ the 1.2) × H of upper surface peak apart from described bed die circle of extremely described bed die in described bed die circle, make the upper surface 1.2 × H ~ 1000mm of mould in the lower surface distance of patrix;
Step 2, cast gear molten metal: in the cast chamber that the upper surface of inner surface and described bed die that gear molten metal qualified for melting is poured into described bed die circle is formed, the upper surface 1 ~ 20mm extremely apart from described bed die circle stops;
Step 3, matched moulds: the movable plate of described liquid forging machine drives described patrix descending rapidly, and extremely described patrix contacts with described middle mould and is pressurized to setting pressure and keeps;
Step 4, lower pressurization extrusion molding: the extrusion oil cylinder of described liquid forging machine drives described bed die up, the epimere cylinder of plate hole core and axis hole core enters in through hole corresponding to described patrix, gear molten metal be pushed to described bed die, described middle mould and described patrix formed die casting chamber in be full of, progressively be pressurized to the system pressure of setting, keep pressure until gear molten metal solidifies;
Step 5, die sinking is loosed core: described liquid forging machine drives up (1.1 ~ the 1.5) × Hmm of described patrix, exercises described plate hole core and described axis hole core extraction gear blank under described bed die;
Step 6, ejects: it is up that the knockout cylinder of described liquid forging machine promotes described bed die circle, promotes described gear blank up, described gear blank is separated with described middle mould, obtains the gear blank of needs of the present invention.
Preferably, in step 3, the movable plate of described liquid forging machine drives described patrix descending rapidly with the speed of 100 ~ 600mm/s; Described setting pressure equals the horizontal projected area of (20 ~ 150MPa) × gear blank;
In step 4, be progressively pressurized to the system pressure of setting with the pumping rate of 2 ~ 5MPa/S.
The so-called D1 of the present invention is the shaft hole diameter of gear blank;
The so-called D2 of the present invention is the wheel rim internal diameter of gear blank;
The so-called D3 of the present invention is the tip diameter of gear blank;
The so-called H of the present invention is the thickness of teeth of gearing blanks.
To there is cold shut and shrink defects, plate hole and axis hole when existing extrusion casting method prepares straight spur gear blank can not become through hole, die life short problem to solve, propose the present invention.
Beneficial effect of the present invention can be summarized as follows:
(1) stock utilization is high: the cylindrical straight gear metal-toothed wheel belt peristome base that the present invention obtains, profile is similar to gear part profile, there are the structures such as tooth, wheel rim, disc, wheel hub, stay the draw taper of the allowance of 0.5-2mm, the shrinkage factor of 1-1.3% and 0.5-1 °.Lightening hole on the axis hole of wheel hub and disc is through hole.Eliminate the rising head in existing foundry engieering, and directly obtain tooth-formation of gear, stock utilization is up to more than 95%;
(2) quality is high, performance good: gained gear blank dense structure of the present invention, ungauged regions defect and cold shut defects, performance can compare favourably with solid die forging gear.
(3) high-efficient energy-saving environment friendly: with can the metal mold of Reusability and metal-cored replacement sand mold and core, have fundamentally eradicated the dust pollution of sand casting; The waste heat after gear blank depanning can be utilized to carry out Residual Heat Treatment, saved the energy, improved cutting ability; Because under pressurized conditions, cooling velocity improves several times than sand casting, production efficiency is high.
Accompanying drawing explanation
Fig. 1 straight tooth column metal gear blank section
Mould state when Fig. 2 is poured
Mould state when Fig. 3 extrusion solidification is shaped
Mould state after the depanning of Fig. 4 gear blank
In figure: the disc 3 of the teeth portion 1 of gear blank, the wheel rim 2 of gear blank, gear blank, plate hole 4, wheel hub 5, axis hole 6, patrix 7, middle mould 8, counterdie 9, bed die circle 10, collar 11, pressure ram 12, lower bolster 13, bed die 14, plate hole core 15, the gear blank 16 of solidification forming, axis hole core 17, cope match-plate pattern 18, gear molten metal 19.
Detailed description of the invention
In order to make technical problem solved by the invention, technical scheme and beneficial effect clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
Environment division:
The squeeze casting mould of a kind of straight tooth column metal gear as shown in Figures 1 to 4, comprises patrix 7, middle mould 8, counterdie 9, bed die 14, plate hole core 15 and axis hole core 17; Described patrix 7, described middle mould 8, described counterdie 9, described bed die 14 and described axis hole core 17 are coaxially arranged, described middle mould 8 is fixed on the upper end of described counterdie 9, described counterdie 9 is provided with slip inner chamber, and described bed die 14 is set within described slip inner chamber and sealing is slided within described slip inner chamber; Described plate hole core 15 and described axis hole core 17 arrange and are fixed on described bed die 14, and described patrix 7 is provided with the location steam vent corresponding with described plate hole core 15 and described axis hole core 17; When described patrix 7 and described middle mould 8 matched moulds, described patrix 7, described middle mould 8, surround the cast chamber of sealing between described counterdie 9 and described bed die 14, the volume in described cast chamber regulates by regulating the position of described counterdie 9; And described plate hole core 15 and described axis hole core 17 are all inserted in the corresponding described location steam vent of setting on described patrix 7.
In the embodiment be more preferably, described squeeze casting mould also comprises bed die circle 10, and described bed die circle 10 to be set within described slip inner chamber and fixing, and described bed die 14 is set within described bed die circle 10 and sealing is slided within described bed die circle 10; When described patrix 7 and described middle mould 8 matched moulds, described patrix 7, described middle mould 8, described counterdie 9, between described bed die circle 10 and described bed die 14, surround the cast chamber of sealing.
In the embodiment be more preferably, described squeeze casting mould also comprises lower bolster 13, pressure ram 12 and collar 11, described counterdie 9 is arranged on described lower bolster 13, perforate on described lower bolster 13, described collar 11 passes the perforate on described lower bolster 13 and is fixed on described counterdie 9, and described pressure ram 12 is also fixed on described bed die 14 through the perforate on described lower bolster 13.
In the embodiment be more preferably, the shape of the lower surface of described patrix 7 is agreed with mutually with the shape within the scope of the upper surface diameter D2 of gear blank, be the plane with exhaust duct beyond the lower surface D2 scope of described patrix 7, be provided with the through hole of respective numbers and size at the correspondence position of gear blank plate hole and axis hole, the upper surface of described patrix 7 is plane, and is fixed together with described patrix 7 plate, is arranged on the movable plate of extrusion casting machine, can be driven and vertically move up and down, movement travel H ~ 1000mm by movable plate, the upper and lower end face of described middle mould 8 is plane, and thickness equals the thickness H of teeth of gearing blanks, and the central authorities of described middle mould 8 are through holes within the scope of diameter D3, the shape of described through hole is the ring gear be meshed with the teeth portion of gear blank, and is fixed together with described counterdie 9, is arranged on the workbench of extrusion casting machine by described counterdie 9 and described lower bolster 13, described counterdie 9 is cylindrical shell, upper and lower end face is for being plane, highly equal (2.5 ~ 5.5) H, fit with the lower surface of described middle mould 8 and tighten together in the upper surface of described counterdie 9, fit with the upper surface of described lower bolster 13 and tighten together in the lower surface of described counterdie 9, central authorities leave lower large little ladder circular hole, in described ladder circular hole, columniform described bed die circle 10 is installed, the macropore of described ladder circular hole bottom and the ring flange matched in clearance of described bed die circle 10, fit clearance 0.05 ~ 0.15mm, the aperture on described ladder circular hole top and the outer surface of upper matched in clearance of described bed die circle 10, matched in clearance 0.1 ~ 0.25mm, described bed die 14 is cylinders, its upper surface shape and gear blank diameter are that the shape within the scope of D2 is agreed with mutually, at the correspondence position of plate hole and axis hole, described plate hole core 15 and described axis hole core 17 are installed, coaxial with described pressure ram 12, the lower surface of described bed die 14 is plane and is connected and fixed with enforcement pressure ram 12, can vertically move up and down in described bed die circle 10 under described pressure ram 12 drives, movement travel (1 ~ 2) H, be matched in clearance between the surface in the outer surface of described bed die 14 and described bed die circle 10, fit clearance 0.1 ~ 0.25mm, described bed die circle 10 is bottom cylinders with ring flange, the cylindrical matched in clearance of its endoporus and described bed die 14, fit clearance 0.1 ~ 0.25mm, its outer wall coordinates with the shoulder hole of described counterdie 9, top fit clearance 0.1 ~ 0.25mm, the ring flange of described bed die circle 10 and the fit clearance in described counterdie 9 hole are 0.05 ~ 0.15mm, the upper surface outside diameter of described bed die circle 10 equals the root diameter of gear blank, the interior circular diameter of described bed die circle 10 is equal with the D2 of gear blank, the total height of described bed die circle 10 is (2 ~ 5) × H, on the ring flange of described bed die circle 10, the distance at the step place of plane separation counterdie 9 shoulder hole is movement travel, movement travel is H+1 ~ H+100mm, the lower surface of described bed die circle 10 is connected with described collar 11, can be driven by the knockout cylinder of extrusion casting machine and move up and down.
In the embodiment be more preferably, described plate hole core 15 and described axis hole core 17 are made with hot die steel, two sections are cylinder, one section, centre is the round platform with 0.5 ~ 1 ° of tapering, the basal diameter of round platform is identical with the cylindrical diameter of hypomere, and the end face diameter of round platform is identical with the cylindrical diameter of epimere, highly equals the length of corresponding aperture on gear blank, three sections of intersections are without step, and lower surface and bed die 14 are connected firmly.
Described squeeze casting mould is in certain preferred embodiment, and it is specifically implemented as follows:
The patrix 7 of this mould is made with hot die steel, lower surface mid-diameter is that the shape within the scope of D2 is agreed with mutually with the shape within the scope of the upper surface diameter D2 of gear blank, it is the plane with exhaust duct beyond the D2 scope of lower surface, the through hole of respective numbers and size is provided with at the correspondence position of gear blank plate hole 4 and axis hole 6, upper surface is plane, be fixed together by screw and cope match-plate pattern 18, be arranged on the movable plate (being also moved cross beam) of extrusion casting machine, driven by movable plate and vertically move up and down, movement travel H ~ 1000mm;
Described middle mould 8 is made with hot die steel, upper and lower end face is plane, thickness equals the thickness H of teeth of gearing blanks, through hole within the scope of its mid-diameter D3, shape of through holes is the ring gear be meshed with the teeth portion 1 of gear blank, with patrix 7 and counterdie 9 coaxial, be fixed together with screw and counterdie 9, be arranged on the workbench of extrusion casting machine by counterdie and lower bolster;
Described counterdie 9 is cylindrical shell, make with hot die steel, upper and lower end face is for being plane, highly equal (2.5 ~ 5.5) H, upper surface is together with middle mould 8 lower surface laminating screw fastening, fit with lower bolster 13 upper surface and with together with screw fastening in lower surface, central authorities leave lower large little ladder circular hole, in ladder circular hole, columniform bed die circle 10 is installed, the macropore of bottom and the ring flange matched in clearance of bed die circle 10, fit clearance 0.05 ~ 0.15mm, the aperture on top and the outer surface of upper matched in clearance of bed die circle 10, matched in clearance 0.1 ~ 0.25mm,
Described bed die 14 is cylinders, make with hot die steel, its upper surface shape and gear blank diameter are that the shape within the scope of D2 is agreed with mutually, at the correspondence position of plate hole 4 and axis hole 6, plate hole core 15 and axis hole core 17 are installed, coaxial with pressure ram 12, its lower surface is plane, be connected and fixed by screw and pressure ram 12, can vertically move up and down in bed die circle 10 under pressure ram 12 drives, movement travel (1 ~ 2) H, be matched in clearance between its outer surface and bed die circle 10 inner surface, fit clearance 0.1 ~ 0.25mm; Described plate hole core 15 and axis hole core 17 are made with hot die steel, two sections are cylinder, one section, centre is the round platform with 0.5 ~ 1 ° of tapering, the basal diameter of round platform is identical with the cylindrical diameter of hypomere, the end face diameter of round platform is identical with the cylindrical diameter of epimere, highly equals the length of corresponding aperture on gear blank, and three sections of intersections are without step, screwed hole is left in lower surface, is connected firmly by screw and bed die 14;
Described bed die circle 10 is bottom cylinders with ring flange, with patrix 7, middle mould 8, bed die 14 is coaxial, its endoporus and bed die 14 cylindrical matched in clearance, fit clearance 0.1 ~ 0.25mm, its outer wall coordinates with the shoulder hole of counterdie 9, top fit clearance 0.1 ~ 0.25mm, the fit clearance in ring flange and counterdie 9 hole is 0.05 ~ 0.15mm, upper surface outside diameter equals the root diameter of gear blank, interior circular diameter is equal with the D2 of gear blank, its total height is (2 ~ 5) × H, on its ring flange, the distance at the step place of plane separation counterdie 9 shoulder hole is movement travel, movement travel is H+1 ~ H+100mm, lower surface is connected with collar 11 by screw, driven by the knockout cylinder of extrusion casting machine and move up and down.
Method part:
A kind of casting method applying the squeeze casting mould of described straight tooth column metal gear as shown in Figures 2 to 4, comprises step as follows:
Step 1, adjustment mould: primer fluid forging machine, bed die circle 10 is made to move to the upper surface of described bed die circle 10 concordant with the upper surface of counterdie 9, make bed die 14 enter upper surface (1 ~ the 1.2) × H of upper surface peak apart from described bed die circle 10 of extremely described bed die 14 in described bed die circle 10, make the upper surface 1.2 × H ~ 1000mm of mould 8 in the lower surface distance of patrix 7;
Step 2, cast gear molten metal: in the cast chamber that the upper surface of inner surface and described bed die 14 that gear molten metal qualified for melting is poured into described bed die circle 10 is formed, the upper surface 1 ~ 20mm extremely apart from described bed die circle 10 stops;
Step 3, matched moulds: the movable plate of described liquid forging machine drives described patrix 7 descending rapidly, and extremely described patrix 7 contacts with described middle mould 8 and is pressurized to setting pressure and keeps;
Step 4, lower pressurization extrusion molding: the extrusion oil cylinder of described liquid forging machine drives described bed die 14 up, the epimere cylinder of plate hole core 15 and axis hole core 17 enters in the through hole of described patrix 7 correspondence, gear molten metal be pushed to described bed die 14, described middle mould 8 and described patrix 7 formed die casting chamber in be full of, progressively be pressurized to the system pressure of setting, keep pressure until gear molten metal solidifies;
Step 5, die sinking is loosed core: described liquid forging machine drives up (1.1 ~ the 1.5) × Hmm of described patrix 7, and described plate hole core 15 exercised for 14 times by described bed die and gear blank extracted out by described axis hole core 17;
Step 6, ejects: it is up that the knockout cylinder of described liquid forging machine promotes described bed die circle 10, promotes described gear blank up, described gear blank is separated with described middle mould 8, obtains the gear blank of needs of the present invention.
In the embodiment be more preferably, in step 3, the movable plate of described liquid forging machine drives described patrix 7 descending rapidly with the speed of 100 ~ 600mm/s; Described setting pressure equals the horizontal projected area of (20 ~ 150MPa) × gear blank; In step 4, be progressively pressurized to the system pressure of setting with the pumping rate of 2 ~ 5MPa/S.
In some preferred embodiment of described extrusion casting method, it is specifically implemented as follows:
Embodiment 1
An extrusion casting method for cylindrical straight gear metal-toothed wheel belt peristome base, comprises the steps
Step 1 adjusts mould: primer fluid forging machine, bed die circle 10 is made to move to the upper surface of bed die circle 10 concordant with counterdie 9 upper surface, make bed die 14 enter the interior upper surface peak to bed die 14 of bed die circle 10 apart from bed die circle 10 upper surface H, make mould 8 upper surface 1.2 × Hmm in the distance of patrix 7 lower surface;
Step 2 pours into a mould gear molten metal 19, is poured into by gear molten metal 19 qualified for melting in cast chamber that bed die circle 10 inner surface and bed die 14 upper surface formed, stops to apart from bed die circle 10 upper surface 1mm;
Step 3 matched moulds, it is descending rapidly with the speed of 100mm/s that liquid forging motor driven type strip moves patrix 7, contacts and be pressurized to setting pressure to keep to patrix 7 with middle mould 8; Described setting pressure equals the horizontal projected area of (20MPa) × gear blank;
Step 4 extrudes, liquid forging machine extrusion oil cylinder drives bed die 14 up, the epimere cylinder of plate hole core 15 and axis hole core 17 enters in the through hole of patrix 7 correspondence, gear molten metal be pushed to bed die 10, middle mould 8 and patrix 7 formed die casting chamber in be full of, progressively be pressurized to the system pressure of setting with the pumping rate of 2MPa/S, keep pressure until gear molten metal 19 solidifies;
Step 5 die sinking is loosed core, and liquid forging machine drives up (the 1.1) × Hmm of patrix 7, and bed die exercises plate hole core 15 14 times and gear blank 16 extracted out by axis hole core 17
Step 6 ejects: it is up that liquid forging machine knockout cylinder promotes bed die circle 10, promotes gear blank 16 up, gear blank 16 is separated with middle mould 8, obtains gear blank 16 of the present invention;
Embodiment 2
An extrusion casting method for cylindrical straight gear metal-toothed wheel belt peristome base, comprises the steps
Step 1 adjusts mould: primer fluid forging machine, bed die circle 10 is made to move to the upper surface of bed die circle 10 concordant with counterdie 9 upper surface, make bed die 14 enter the interior upper surface peak to bed die 14 of bed die circle 10 apart from bed die circle 10 upper surface (1.1) × H, make mould 8 upper surface 500mm in the distance of patrix 7 lower surface;
Step 2 pours into a mould gear molten metal 19, is poured into by gear molten metal 19 qualified for melting in cast chamber that bed die circle 10 inner surface and bed die 14 upper surface formed, stops to apart from bed die circle 10 upper surface 10mm;
Step 3 matched moulds, it is descending rapidly with the speed of 350mm/s that liquid forging motor driven type strip moves patrix 7, contacts and be pressurized to setting pressure to keep to patrix 7 with middle mould 8; Described setting pressure equals the horizontal projected area of (85MPa) × gear blank;
Step 4 extrudes, liquid forging machine extrusion oil cylinder drives bed die 14 up, the epimere cylinder of plate hole core 15 and axis hole core 17 enters in the through hole of patrix 7 correspondence, gear molten metal be pushed to bed die 10, middle mould 8 and patrix 7 formed die casting chamber in be full of, progressively be pressurized to the system pressure of setting with the pumping rate of 3.5MPa/S, keep pressure until gear molten metal 19 solidifies;
Step 5 die sinking is loosed core, and liquid forging machine drives up (the 1.3) × Hmm of patrix 7, and bed die exercises plate hole core 15 14 times and gear blank 16 extracted out by axis hole core 17
Step 6 ejects: it is up that liquid forging machine knockout cylinder promotes bed die circle 10, promotes gear blank 16 up, gear blank 16 is separated with middle mould 8, obtains gear blank 16 of the present invention;
Embodiment 3
An extrusion casting method for cylindrical straight gear metal-toothed wheel belt peristome base, comprises the steps
Step 1 adjusts mould: primer fluid forging machine, bed die circle 10 is made to move to the upper surface of bed die circle 10 concordant with counterdie 9 upper surface, make bed die 14 enter the interior upper surface peak to bed die 14 of bed die circle 10 apart from bed die circle 10 upper surface (1.2) × H, make mould 8 upper surface 1000mm in the distance of patrix 7 lower surface;
Step 2 pours into a mould gear molten metal 19, is poured into by gear molten metal 19 qualified for melting in cast chamber that bed die circle 10 inner surface and bed die 14 upper surface formed, stops to apart from bed die circle 10 upper surface 20mm;
Step 3 matched moulds, it is descending rapidly with the speed of 600mm/s that liquid forging motor driven type strip moves patrix 7, contacts and be pressurized to setting pressure to keep to patrix 7 with middle mould 8; Described setting pressure equals the horizontal projected area of (150MPa) × gear blank;
Step 4 extrudes, liquid forging machine extrusion oil cylinder drives bed die 14 up, the epimere cylinder of plate hole core 15 and axis hole core 17 enters in the through hole of patrix 7 correspondence, gear molten metal be pushed to bed die 10, middle mould 8 and patrix 7 formed die casting chamber in be full of, progressively be pressurized to the system pressure of setting with the pumping rate of 5MPa/S, keep pressure until gear molten metal 19 solidifies;
Step 5 die sinking is loosed core, and liquid forging machine drives up (the 1.5) × Hmm of patrix 7, and bed die exercises plate hole core 15 14 times and gear blank 16 extracted out by axis hole core 17
Step 6 ejects: it is up that liquid forging machine knockout cylinder promotes bed die circle 10, promotes gear blank 16 up, gear blank 16 is separated with middle mould 8, obtains gear blank 16 of the present invention.
The present invention is described in detail in preferred embodiment above by concrete; but those skilled in the art should be understood that; the present invention is not limited to the above embodiment; within the spirit and principles in the present invention all; any amendment of doing, equivalent replacement etc., all should be included within protection scope of the present invention.

Claims (6)

1. a squeeze casting mould for straight tooth column metal gear, is characterized in that: comprise patrix, middle mould, counterdie, bed die, plate hole core and axis hole core; Described patrix, described middle mould, described counterdie, described bed die and described axis hole core are coaxially arranged, described middle mould is fixed on the upper end of described counterdie, described counterdie is provided with slip inner chamber, and described bed die is set within described slip inner chamber and sealing is slided within described slip inner chamber; Described plate hole core and described axis hole core arrange and are fixed on described bed die, and described patrix is provided with the location steam vent corresponding with described plate hole core and described axis hole core; When described patrix and described middle mould matched moulds, described patrix, described middle mould, surround the cast chamber of sealing between described counterdie and described bed die, the volume in described cast chamber is by regulating the position of described counterdie to regulate; And described plate hole core and described axis hole core are all inserted in corresponding described location steam vent that described patrix is arranged;
Also comprise bed die circle, described bed die snare to be located within described slip inner chamber and fixing, and described bed die is set within described bed die circle and sealing is slided within described bed die circle; When described patrix and described middle mould matched moulds, described patrix, described middle mould, described counterdie, between described bed die circle and described bed die, surround the cast chamber of sealing.
2. the squeeze casting mould of straight tooth column metal gear according to claim 1, it is characterized in that: also comprise lower bolster, pressure ram and collar, described counterdie is arranged on described lower bolster, perforate on described lower bolster, described collar passes the perforate on described lower bolster and is fixed on described counterdie, and described pressure ram is also fixed on described bed die through the perforate on described lower bolster.
3. the squeeze casting mould of straight tooth column metal gear according to claim 2, is characterized in that:
The shape of the lower surface of described patrix is agreed with mutually with the shape within the scope of the upper surface diameter D2 of gear blank, be the plane with exhaust duct beyond the lower surface D2 scope of described patrix, be provided with the through hole of respective numbers and size at the correspondence position of gear blank plate hole and axis hole; The upper surface of described patrix is plane, and is fixed together with described cope match-plate pattern, is arranged on the movable plate of extrusion casting machine, can be driven and vertically move up and down, movement travel H ~ 1000mm by movable plate;
The upper and lower end face of described middle mould is plane, and thickness equals the thickness H of teeth of gearing blanks, and the central authorities of described middle mould are through holes within the scope of diameter D3; The shape of described through hole is the ring gear be meshed with the teeth portion of gear blank, and is fixed together with described counterdie, is arranged on the workbench of extrusion casting machine by described counterdie and described lower bolster;
Described counterdie is cylindrical shell, upper and lower end face is for being plane, highly equal (2.5 ~ 5.5) H, fit with the lower surface of described middle mould and tighten together in the upper surface of described counterdie, fit with the upper surface of described lower bolster and tighten together in the lower surface of described counterdie, central authorities leave lower large little ladder circular hole, in described ladder circular hole, columniform described bed die circle is installed, the macropore of described ladder circular hole bottom and the ring flange matched in clearance of described bed die circle, fit clearance 0.05 ~ 0.15mm, the aperture on described ladder circular hole top and the outer surface of upper matched in clearance of described bed die circle, matched in clearance 0.1 ~ 0.25mm,
Described bed die is a cylinder, its upper surface shape and gear blank diameter are that the shape within the scope of D2 is agreed with mutually, at the correspondence position of plate hole and axis hole, described plate hole core and described axis hole core are installed, coaxial with described pressure ram, the lower surface of described bed die is plane and is connected and fixed with enforcement pressure ram, can vertically move up and down in described bed die circle under described pressure ram drives, movement travel (1 ~ 2) H, be matched in clearance between the surface in the outer surface of described bed die and described bed die circle, fit clearance 0.1 ~ 0.25mm;
Described bed die circle is the cylinder of bottom with ring flange, the cylindrical matched in clearance of its endoporus and described bed die, fit clearance 0.1 ~ 0.25mm, its outer wall coordinates with the shoulder hole of described counterdie, top fit clearance 0.1 ~ 0.25mm, the ring flange of described bed die circle and the fit clearance of described lower nib are 0.05 ~ 0.15mm, the upper surface outside diameter of described bed die circle equals the root diameter of gear blank, the interior circular diameter of described bed die circle is equal with the D2 of gear blank, the total height of described bed die circle is (2 ~ 5) × H, on the ring flange of described bed die circle, the distance at the step place of plane separation counterdie shoulder hole is movement travel, movement travel is H+1 ~ H+100mm, the lower surface of described bed die circle is connected with described collar, can be driven by the knockout cylinder of extrusion casting machine and move up and down.
4. the squeeze casting mould of straight tooth column metal gear according to claim 1, it is characterized in that: described plate hole core and described axis hole core hot die steel are made, two sections are cylinder, one section, centre is the round platform with 0.5 ~ 1 ° of tapering, the basal diameter of round platform is identical with the cylindrical diameter of hypomere, and the end face diameter of round platform is identical with the cylindrical diameter of epimere, highly equals the length of corresponding aperture on gear blank, three sections of intersections are without step, and lower surface and bed die are connected firmly.
5. a casting method for application squeeze casting mould of straight tooth column metal gear as described in claim 1-4 any one, is characterized in that: comprise step as follows:
Step 1, adjustment mould: primer fluid forging machine, bed die circle is made to move to the upper surface of described bed die circle concordant with the upper surface of counterdie, make bed die enter upper surface (1 ~ the 1.2) × H of upper surface peak apart from described bed die circle of extremely described bed die in described bed die circle, make the upper surface 1.2 × H ~ 1000mm of mould in the lower surface distance of patrix;
Step 2, cast gear molten metal: in the cast chamber that the upper surface of inner surface and described bed die that gear molten metal qualified for melting is poured into described bed die circle is formed, the upper surface 1 ~ 20mm extremely apart from described bed die circle stops;
Step 3, matched moulds: the movable plate of described liquid forging machine drives described patrix descending rapidly, and extremely described patrix contacts with described middle mould and is pressurized to setting pressure and keeps;
Step 4, lower pressurization extrusion molding: the extrusion oil cylinder of described liquid forging machine drives described bed die up, the epimere cylinder of plate hole core and axis hole core enters in through hole corresponding to described patrix, gear molten metal be pushed to described bed die, described middle mould and described patrix formed die casting chamber in be full of, progressively be pressurized to the system pressure of setting, keep pressure until gear molten metal solidifies;
Step 5, die sinking is loosed core: described liquid forging machine drives up (1.1 ~ the 1.5) × Hmm of described patrix, exercises described plate hole core and described axis hole core extraction gear blank under described bed die;
Step 6, ejects: it is up that the knockout cylinder of described liquid forging machine promotes described bed die circle, promotes described gear blank up, described gear blank is separated with described middle mould, obtains the gear blank of needs of the present invention.
6. casting method according to claim 5, is characterized in that:
In step 3, the movable plate of described liquid forging machine drives described patrix descending rapidly with the speed of 100 ~ 600mm/s; Described setting pressure equals the horizontal projected area of (20 ~ 150MPa) × gear blank;
In step 4, be progressively pressurized to the system pressure of setting with the pumping rate of 2 ~ 5MPa/s.
CN201310132120.2A 2013-04-16 2013-04-16 The squeeze casting mould of straight tooth column metal gear and casting method thereof CN104107897B (en)

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