CN203076563U - Squeeze-casting die of zinc alloy worm wheel - Google Patents

Squeeze-casting die of zinc alloy worm wheel Download PDF

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Publication number
CN203076563U
CN203076563U CN 201220704999 CN201220704999U CN203076563U CN 203076563 U CN203076563 U CN 203076563U CN 201220704999 CN201220704999 CN 201220704999 CN 201220704999 U CN201220704999 U CN 201220704999U CN 203076563 U CN203076563 U CN 203076563U
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Prior art keywords
die
sleeve
worm gear
kirsite
counterdie
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CN 201220704999
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Chinese (zh)
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朱权利
张先满
汪桂龙
陈家坚
赵海东
陈维平
吴苑标
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Guangdong Guangdong Joaquin Polytron Technologies Inc
South China University of Technology SCUT
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Guangdong Huajin Alloy & Advanced Material Industrial Co Ltd
South China University of Technology SCUT
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Abstract

The utility model discloses a squeeze-casting die of a zinc alloy worm wheel. The squeeze-casting die of the zinc alloy worm wheel comprises an upper die sleeve, a lower die sleeve, an upper die and a lower die, wherein the upper die is embedded on the upper die sleeve, the lower die is embedded on the lower die sleeve, an air vent hole is formed in the center of the upper die and the upper die sleeve, a heating rod is arranged in the lower die sleeve, an overflow groove is formed in the upper end face of the lower die, a cooling water pipe is arranged inside the lower die and is used for arranging an ejector rod which is ejected out by a worm wheel blank on a punch chip, and the ejector rod penetrates through the upper die sleeve and a through hole in the upper die. According to the squeeze-casting die, when the die is opened, friction force produced by solidification and shrinkage of alloy liquid on the step position of the lower end face of the upper die is utilized to enable the worm wheel blank to be on the upper die, the ejector rod which is ejected out by the worm wheel blank is arranged on the punch chip, the ejector rod penetrates through the upper die sleeve and the through hole in the upper die, and the worm wheel blank is ejected out by the ejector rod. Therefore, a structure of the squeeze-casting die is simplified.

Description

The squeeze casting mould of kirsite worm gear
Technical field
The utility model relates to the extrusion casint technology of preparing, is specifically related to a kind of squeeze casting mould of kirsite worm gear.
Background technology
Owing to have advantages of good casting, mechanical property, friction and wear behavior, processing characteristics and cheap advantages such as cost, kirsite is widely used in the more multi-field of modern industry as high-abrasive material, and part replaces structural materials such as bronze, brass and cast iron.Such as, along with the overall development of elevator industry, the requirement of comfort level, security performance and other mechanical performances of elevator is also constantly promoted, select high-performance for use, the elevator accessory will bring the tangible market advantage cheaply.Traditional Worm wheel of tractor, the general metal mold gravity casting technology that adopts, in view of the coagulating property that the wide and easy generation of the kirsite crystallization range end contracts, the worm gear crystal grain of preparation is thick, tissue looseness, easily produce shrinkage cavity shrinkage porosity, worm-gear toothing root particularly, plasticity, toughness and anti-wear performance are relatively poor, in the course of the work the too fast wear phenomenon of generation early, mechanicalness noise is big, and brings potential safety hazard.Simultaneously, adopt metal gravity casting die, the blank of worm gear size of preparation is bigger, need be machined to smart base in a large number, makes that raw material and rate of energy are low, has increased production cost.
The utility model content
The utility model is in order to overcome the deficiency that above prior art exists, a kind of squeeze casting mould of high-quality and efficient kirsite worm gear is provided, under the lower condition of resource and energy resource consumption, the product that obtains is compared with the kirsite worm gear of metal gravity casting die production, organize tiny, no shrinkage cavity shrinkage porosity, combination property further improves.
The purpose of this utility model realizes by following technical scheme: the squeeze casting mould of kirsite worm gear, comprise Upper Die-sleeve, lower die-sleeve, upper die and lower die, described patrix is embedded in Upper Die-sleeve, counterdie is embedded in lower die-sleeve, and patrix and Upper Die-sleeve center are provided with steam vent, are provided with heating rod in the lower die-sleeve, the upper surface of counterdie is provided with overflow launder, counterdie inside has cooling water pipe, is used for the push rod that the worm gear base ejects is arranged on drift, and push rod passes the through hole of Upper Die-sleeve and patrix.
The lower surface of described patrix is stretched in the die cavity of counterdie under the matched moulds state, and the lower surface is in the inner radius of die cavity.
The die cavity of described counterdie is the annular shape with many steps.
Described patrix is embedded in Upper Die-sleeve by nut, and counterdie is embedded in lower die-sleeve by nut.
Described heating rod is the resistance wire heating rod.
The interior die wall of the die cavity of described counterdie is provided with 3 ~ 10 ° tapering.
Each step transition place of the die cavity of described counterdie is provided with the fillet of R1 ~ 5.
The Extrution casting technique of the squeeze casting mould of this kirsite worm gear may further comprise the steps:
(1), determines alloying ingredient;
(2), alloying ingredient is smelted into alloy liquid at smelting furnace, is rapidly heated low smelting heat, alloy liquid composition after the melting according to percentage by weight is: 22 ~ 32%Al, 1.0 ~ 5.0%Cu, 0.1 ~ 1.5%Mn, 0.01 ~ 0.2%Mg, 0.01 ~ 0.1%Ti, 0.005 ~ 0.1%B, 0.01 ~ 0.1%RE, surplus is Zn and unavoidable impurities, adds refining agent, skims, degasification, and the alloy liquid in the smelting furnace carried out stokehold check, change holding furnace over to after qualified to be incubated;
(3), the extrusion casting machine die shoe is provided with the running gate system of automatic propelling movement, after the manipulator scoop of running gate system dipped quantitative alloy liquid in the holding furnace, running gate system was advanced to the mold center position automatically, alloy liquid flows into die cavity through running gate system;
(4), after cast finishes, running gate system automatically resets, withdraw from mould, the drift of extrusion casting machine descends and steadily advances alloy liquid to die cavity, and supercharging makes the crystallization under the high pressure effect of alloy liquid fast, and is solidifying under the feeding by force, through the up die sinking of pressurize back punching head, the worm gear base is stayed patrix during die sinking, and push rod ejects the worm gear base, by material-receiving device the worm gear base is taken out.
In the described step (3), the manipulator scoop dips before the alloy liquid, and mould and running gate system all are heated to 150 ~ 250 ℃, and scribbles the kirsite releasing agent on the runner of the die cavity of mould and running gate system.
In the described step (3), the alloy liquid running gate system of flowing through carries out flowing into die cavity after the skimming.
Described running gate system pushes automatically under the drive of cylinder and automatically resets.
In the described step (2), the peak power of smelting furnace is 250KW ~ 300KW, and the maximum temperature of smelting furnace is 650 ℃ ~ 700 ℃, and the holding temperature of alloy liquid is 570 ~ 630 ℃.
In the described step (4), the decrease speed of drift is 0.1 ~ 15mm/s, and specific pressure is 30 ~ 180MPa, and the dwell time is 40 ~ 120s.
In the described step (1), in alloying ingredient, copper, manganese, titanium, compound rare-earth add with the form of AlCu50, AlMn10, AlTi5B, AlRE10 intermediate alloy respectively, and boron adds with the form of AlTi5B and AlB3 intermediate alloy.
In the described step (2), smelting furnace and holding furnace are medium-frequency induction furnace.
The utility model has following advantage with respect to prior art:
One, mould of the present utility model, utilize the solidification shrinkage of alloy liquid to make the worm gear base stay patrix during die sinking in the frictional force of step place, patrix lower surface generation, be used for the push rod that the worm gear base ejects is arranged on drift, push rod passes the through hole of Upper Die-sleeve and patrix, and the rear worm wheel base is ejected by push rod, so simplified the structure of squeeze casting mould.
Two, adopt the combining structure of core rod and die sleeve, make when producing the worm gear base of different size, only need to change core rod, thereby saved production cost.
Three, smelting technology has been optimized in the extrusion casint of this kirsite worm gear, employing is rapidly heated, the measure of low smelting heat, the peak power of smelting furnace is 250KW ~ 300KW, the maximum temperature of smelting furnace is 650 ℃ ~ 700 ℃, reduce the oxidation of zinc liquid and air-breathing effectively, reduced the scaling loss of alloy liquid, simultaneously, adopt medium-frequency induction furnace, also guaranteed the uniformity of alloy liquid composition.
Four, the cleannes of alloy liquid have been improved.On the one hand, adopt medium-frequency induction furnace, stopped alloy liquid and contacted, reduced the possibility that alloy liquid is brought objectionable impurities such as iron into the direct of ironware as holding furnace; On the other hand, alloy liquid is after the skimming of homemade running gate system, and the oxide on top layer and being mingled with is eliminated.
Five, the combination property of foundry goods significantly improves.The kirsite worm gear that adopts this squeeze casting mould to make, crystallization under sufficient pressure, and feeding by force takes place and solidify, dendrite is broken under pressure, crystal grain is tiny, eliminated casting flaws such as shrinkage cavity shrinkage porosity, organized densification more, so excellent combination property, wherein, tooth root portion tensile strength is brought up to 350 ~ 450MPa, there is no shrinkage porosite, and corrosion resistance and wearability also increase substantially.Extrusion casint has overcome shortcomings such as kirsite plasticity, toughness and elevated temperature strength are low, has obviously improved the performance of as cast condition kirsite, has enlarged its application greatly.
Six, the kirsite worm gear that utilizes the manufacturing of this squeeze casting mould to form can improve blank size precision, has reduced allowance, realizes the low consumption of the resource and the energy, has reduced production cost.
Description of drawings
Fig. 1 is the structural representation of the squeeze casting mould of kirsite worm gear of the present utility model.
Description of reference numerals:
The 1-drift; The 2-push rod; The 3-Upper Die-sleeve; The 4-patrix; The 5-overflow launder; The 6-die cavity; The 7-cooling water pipe; The 8-counterdie; The 9-lower die-sleeve; The 10-nut; The 11-heating rod; The 12-through hole; The 13-steam vent; The 14-running gate system; The 15-lower surface; The A-tapering.
Fig. 2 is a process forming process schematic diagram of the present utility model.
Fig. 3 is the microscopic structure of alloying component under metal mold gravity casting technology of embodiment 1.
Fig. 4 is the microscopic structure of alloying component under Extrution casting technique of embodiment 1.
The specific embodiment
The utility model is described in further detail below in conjunction with drawings and Examples.
Embodiment 1:
As shown in Figure 1, mould comprises Upper Die-sleeve, lower die-sleeve, upper die and lower die, patrix is embedded in Upper Die-sleeve by nut, counterdie is embedded in lower die-sleeve by nut, patrix and Upper Die-sleeve center are provided with steam vent, steam vent can be discharged the gas of upper and lower mould center sealing behind the matched moulds, prevents that the worm gear base from producing pore; Be provided with the heating rod that utilizes the resistance wire heating in the lower die-sleeve, heating rod conveniently is heated to temperature required to mould; The upper surface of counterdie is provided with overflow launder, produces batch seam so that the pressure loss when overflow launder can prevent excessive cast, and counterdie inside has cooling water pipe, and cooling water pipe can guarantee the die cavity temperature; Be used for the push rod that the worm gear base ejects is arranged on drift, push rod passes the through hole of Upper Die-sleeve and patrix, and die cavity is the annular shape with many steps.The interior die wall of die cavity is provided with 8 ° taper angles A, and each step transition place of die cavity is provided with the fillet of R1 ~ 5.The lower surface of patrix is stretched in the die cavity of counterdie under the matched moulds state, and the lower surface is in the inner radius of die cavity.
The Extrution casting technique of kirsite worm gear as shown in Figure 2 may further comprise the steps:
(1), determines alloying ingredient;
In alloying ingredient, copper, manganese, titanium, compound rare-earth add with the form of AlCu50, AlMn10, AlTi5B, AlRE10 intermediate alloy respectively, and boron adds with the form of AlTi5B and AlB3 intermediate alloy.
(2), alloying ingredient is smelted into alloy liquid at smelting furnace, is rapidly heated low smelting heat, alloy liquid composition after the melting according to percentage by weight is: 27%Al, 1.0%Cu, 0.2%Mn, 0.05%Mg, 0.03%Ti, 0.005%B, 0.05%RE, surplus is Zn and unavoidable impurities, adds refining agent, skims, degasification, and the alloy liquid in the smelting furnace carried out stokehold check, change holding furnace over to after qualified to be incubated;
The peak power of smelting furnace is 250KW, and the maximum temperature of smelting furnace is 680 ℃, and the holding temperature of alloy liquid is 600 ℃.
Smelting furnace and holding furnace are medium-frequency induction furnace.
(3), the extrusion casting machine die shoe is provided with the running gate system of automatic propelling movement, after the manipulator scoop of running gate system dipped quantitative alloy liquid in the holding furnace, running gate system was advanced to the mold center position automatically, alloy liquid flows into die cavity through running gate system;
The manipulator scoop dips before the alloy liquid, and mould and running gate system all are heated to 200 ℃, and scribbles the kirsite releasing agent on the runner of the die cavity of mould and running gate system.
The alloy liquid running gate system of flowing through carries out flowing into die cavity after the skimming.
Running gate system pushes automatically under the drive of cylinder and automatically resets.
(4), after cast finishes, running gate system automatically resets, withdraw from mould, the drift of extrusion casting machine descends and steadily advances alloy liquid to die cavity, and supercharging makes the crystallization under the high pressure effect of alloy liquid fast, and is solidifying under the feeding by force, through the up die sinking of pressurize back punching head, the worm gear base is stayed patrix during die sinking, and push rod ejects the worm gear base, by material-receiving device the worm gear base is taken out.
The fall off rate of drift is 0.1mm/s, and specific pressure is 60MPa, and the dwell time is 60s.
(5) the worm gear base to taking off, after being machined to smart base, gear hobbing becomes worm gear.
In the extrusion casint process because the crystallization under high pressure of alloy liquid, and feeding by force take place and solidify, so remarkable refinement crystal grain, eliminated shrinkage cavity shrinkage porosity, improved the density of alloy, thereby made the combination property of Zinc-alloy increase substantially.The effect of pressure has on the one hand improved nucleation rate, and the fusing point of the alloy that also raise causes setting rate to be accelerated, thus refinement crystal grain, on the other hand, also increased the solid solubility in zinc such as aluminium and copper, played the effect of solution strengthening and dispersion-strengtherning.
Worm rim entity heart portion to preparation takes a sample, and carries out mechanical property and microscopic structure comparative analysis.The microscopic structure of metal mold gravity casting as shown in Figure 3, the microscopic structure of extrusion casint as shown in Figure 4, find that same alloying component is under the Extrution casting technique, dendrite is obviously broken, crystal grain is tiny, no shrinkage cavity shrinkage porosity, thus improved the mechanical performance of alloy, especially plasticity be improved significantly, see the following form:
Technology Tensile strength (MPa) Percentage elongation (%)
Metal mold gravity casting 231 0.8
Extrusion casint 365 5.2
Embodiment 2:
Zinc liquid is poured in the running gate system that is preheating to 150 ℃, simultaneously mould and die preheating to 150 ℃.Before cast, running gate system and mould are all coated the kirsite releasing agent.The pouring temperature of zinc liquid is 600 ℃, and alloy liquid composition according to percentage by weight is: 22%Al, and 5.0%Cu, 0.2%Mn, 0.01%Mg, 0.01%Ti, 0.02%B, 0.01%RE, surplus is Zn and unavoidable impurities.To push drift then and steadily advance alloy liquid, quick supercharging to make the crystallization under high pressure effect of alloy liquid, and solidify under the feeding by force,, and eject the worm gear base, the worm gear base be taken out by material-receiving device through the up die sinking of pressurize back punching head to mold cavity.The fall off rate of pressure head is 7mm/s, and specific pressure is 120MPa, and the dwell time is 110s.
Embodiment 3:
Zinc liquid is poured in the running gate system that is preheating to 250 ℃, simultaneously mould and die preheating to 250 ℃.Before cast, running gate system and mould are all coated the kirsite releasing agent.The pouring temperature of zinc liquid is 630 ℃, and alloy liquid composition according to percentage by weight is: 32%Al, and 3.0%Cu, 2.0%Mn, 0.05%Mg, 0.1%Ti, 0.02%B, 0.05%RE, surplus is Zn and unavoidable impurities.To push drift then and steadily advance alloy liquid, quick supercharging to make the crystallization under high pressure effect of alloy liquid, and solidify under the feeding by force,, and eject the worm gear base, the worm gear base be taken out by material-receiving device through the up die sinking of pressurize back punching head to mold cavity.The fall off rate of pressure head is 14mm/s, and specific pressure is 30MPa, and the dwell time is 120s.
The above-mentioned specific embodiment is a preferred embodiment of the present utility model; can not limit the utility model; other any change that does not deviate from the technical solution of the utility model and made or other equivalent substitute mode are included within the protection domain of the present utility model.

Claims (6)

1. the squeeze casting mould of kirsite worm gear, it is characterized in that: comprise Upper Die-sleeve, lower die-sleeve, upper die and lower die, described patrix is embedded in Upper Die-sleeve, counterdie is embedded in lower die-sleeve, and patrix and Upper Die-sleeve center are provided with steam vent, are provided with heating rod in the lower die-sleeve, the upper surface of counterdie is provided with overflow launder, counterdie inside has cooling water pipe, is used for the push rod that the worm gear base ejects is arranged on drift, and push rod passes the through hole of Upper Die-sleeve and patrix.
2. the squeeze casting mould of kirsite worm gear according to claim 1 is characterized in that: the lower surface of described patrix is stretched in the die cavity of counterdie under the matched moulds state, and the lower surface is in the inner radius of die cavity.
3. the squeeze casting mould of kirsite worm gear according to claim 2 is characterized in that: the die cavity of described counterdie is the annular shape with many steps.
4. the squeeze casting mould of kirsite worm gear according to claim 1 is characterized in that: described patrix is embedded in Upper Die-sleeve by nut, and counterdie is embedded in lower die-sleeve by nut.
5. the squeeze casting mould of kirsite worm gear according to claim 1 is characterized in that: described heating rod is the resistance wire heating rod.
6. the squeeze casting mould of kirsite worm gear according to claim 2 is characterized in that: the interior die wall of the die cavity of described counterdie is provided with 3~10 ° tapering.
CN 201220704999 2012-12-18 2012-12-18 Squeeze-casting die of zinc alloy worm wheel Active CN203076563U (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104107898A (en) * 2014-06-30 2014-10-22 薛铁山 Zinc alloy worm gear extrusion casting die
CN106180643A (en) * 2016-09-23 2016-12-07 华南理工大学 The extrusion casting method of foundry goods
CN108015234A (en) * 2017-12-05 2018-05-11 西安工业大学 A kind of machine die
CN108608109A (en) * 2018-05-16 2018-10-02 高木汽车部件(佛山)有限公司 The mold and welding method of friction welding apparatus for automobile tail fin production
CN111014581A (en) * 2019-12-31 2020-04-17 安徽应流航源动力科技有限公司 Investment precision casting turbine mold and turbine preparation method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104107898A (en) * 2014-06-30 2014-10-22 薛铁山 Zinc alloy worm gear extrusion casting die
CN106180643A (en) * 2016-09-23 2016-12-07 华南理工大学 The extrusion casting method of foundry goods
CN106180643B (en) * 2016-09-23 2018-11-16 华南理工大学 The extrusion casting method of casting
CN108015234A (en) * 2017-12-05 2018-05-11 西安工业大学 A kind of machine die
CN108608109A (en) * 2018-05-16 2018-10-02 高木汽车部件(佛山)有限公司 The mold and welding method of friction welding apparatus for automobile tail fin production
CN111014581A (en) * 2019-12-31 2020-04-17 安徽应流航源动力科技有限公司 Investment precision casting turbine mold and turbine preparation method

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Address after: 510640 Tianhe District, Guangdong, No. five road, No. 381,

Patentee after: South China University of Technology

Patentee after: Guangdong Guangdong Joaquin Polytron Technologies Inc

Address before: 510640 Tianhe District, Guangdong, No. five road, No. 381,

Patentee before: South China University of Technology

Patentee before: Guangdong Huajin Alloy & Advanced Material Industrial Co., Ltd.

C56 Change in the name or address of the patentee