CN103736928B - A kind of evaporative pattern running gate system of gear box - Google Patents

A kind of evaporative pattern running gate system of gear box Download PDF

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Publication number
CN103736928B
CN103736928B CN201410023882.3A CN201410023882A CN103736928B CN 103736928 B CN103736928 B CN 103736928B CN 201410023882 A CN201410023882 A CN 201410023882A CN 103736928 B CN103736928 B CN 103736928B
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gate
sprue
cross
cross gate
ingate
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CN103736928A (en
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苏勇
汪琴
解明国
吴来发
刘伟
李金磊
马腾迪
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Hefei University of Technology
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Hefei University of Technology
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Abstract

The invention discloses a kind of evaporative pattern running gate system of gear box: sprue is set, described sprue is communicated with cup, the first cross gate and the second cross gate from top to bottom successively, described first cross gate and the second cross gate separately along the radial communication of described sprue on sprue; Further, the first ingate sprue gate, the second ingate sprue gate is respectively equipped with at the first cross gate, the second cross gate away from the end of sprue.Adopt running gate system of the present invention to carry out casting pouring, filling time shortens, and thermal loss reduces, and greatly reduces Shrinkage cavity defect, effectively improves casting quality.

Description

A kind of evaporative pattern running gate system of gear box
Technical field:
The present invention relates to the evaporative pattern running gate system of a kind of evaporative pattern casting system, particularly a kind of gear box.
Background technology:
Lost foam casting the paraffin similar to casting dimension shape or bubbles model is bondd to be combined into model cluster, after brushing fireproof coating is also dried, be embedded in vibration molding in drystone sand, pour into a mould under negative pressure, model is gasified, liquid metals occupies modal position, forms the novel casting method of foundry goods after solidifying cooling.Lost foam casting process comprises running and feeding system design, pouring temperature control, pouring operation control, vacuum cavitations etc.Running gate system has very consequence in lost foam casting process, is a key of castings production success or failure.Therefore, rational Design of Runner System plays vital effect for guarantee evaporative pattern casting quality.
In the present invention, gear box is ironcasting, and material is HT250, belongs to thin-wall part, and casing specification is 560 × 480 × 420mm, and wall unevenness is even, and minimum wall thickness (MINI W.) is 8mm, and thickest is 75mm, for 5-10t fork truck.Often there is the problems such as Shrinkage cavity in the foundry goods that prior art is produced.
Summary of the invention:
For overcoming the defect of prior art, the object of the present invention is to provide a kind of evaporative pattern running gate system of novel gear box, can casting quality be significantly improved.
Technical solution problem of the present invention adopts following technical scheme:
A kind of evaporative pattern running gate system of gear box:
Sprue is set, described sprue is communicated with cup, the first cross gate and the second cross gate from top to bottom successively, described first cross gate and the second cross gate separately along the radial communication of described sprue on sprue; Further, the first ingate sprue gate, the second horizontal ingate sprue gate is respectively equipped with at the first cross gate, the second cross gate away from the end of sprue.
Described first cross gate is totally semicircle, and described sprue is in the middle part of semicircle first cross gate, and two the first ingate sprue gates of described first cross gate end are divided and are in gear box first half both sides.
Described second cross gate is two and forms V-shaped, and two the second ingate sprue gates of the second cross gate end are in thick large part place bottom gear box.
The cross section of described first cross gate, the second cross gate is trapezoidal, and wherein, the end of the first cross gate trapezoid cross section is 2.6: 1 with the ratio of height; 0.73: 1 with the ratio of height at the bottom of second cross gate trapezoid cross section.
Described first ingate sprue gate, the second ingate sprue gate are truncated cone-shaped, and the intracavity section at truncated cone-shaped sprue gate gradually becomes, and it is 2.25: 1 that molten metal inflow end flows out end cross-sectional area ratio with molten metal.
Compared with the prior art, beneficial effect of the present invention is embodied in:
Filling time of the present invention is shorter, because running gate system of the present invention is step gating system, first cross gate, the second cross gate are divided into two-layer up and down, molten metal bath divides two-layer injection cast model by the first cross gate sprue gate, the second cross gate sprue gate, filling time shortens, and thermal loss reduces.Because the present invention is step gating system, the first cross gate is provided with sprue gate in the both sides of the gear box first half, can reduce casing top Shrinkage cavity defect; Two sprue gates of the second cross gate are distributed in thick large part place bottom gear box, and its sectional dimension is larger, well can easily produce Shrinkage cavity position to bottom half and carry out feeding effect, greatly reduce Shrinkage cavity defect, effectively improve casting quality.
Accompanying drawing illustrates:
Fig. 1 is structural representation of the present invention; Fig. 2 is gear box structural representation; Fig. 3 is application state schematic diagram of the present invention.
Number in the figure: 1 cup, 2 sprues, 3 first cross gates, 31 first ingate sprue gates, 4 second cross gates, 41 second ingate sprue gates, 5 gear boxes.
Below by way of detailed description of the invention, and the invention will be further described by reference to the accompanying drawings.
Detailed description of the invention:
Embodiment: composition graphs 1-3, the evaporative pattern running gate system of gear box of the present invention, sprue 2 is communicated with cup 1, first cross gate 3 and the second cross gate 4, first cross gate 3 and the second cross gate 4 respective radial communication along sprue successively from top to bottom on sprue 2; Further, the first ingate sprue gate 41, ingate sprue gate 31, second is respectively equipped with at the first cross gate, the second cross gate away from the end of sprue.
In specifically arranging, the first cross gate 3 is totally semicircle, and sprue is in the middle part of semicircle first cross gate, and 31 points, two first ingate sprue gates of the first cross gate end are in gear box 5 first half both sides.
Second cross gate is length different two and forms V-shaped, and two the second ingate sprue gates 41 of the second cross gate end are in thick large part place bottom gear box.
The cross section of the first cross gate 3, second cross gate 4 is trapezoidal, and wherein, the end of the first cross gate trapezoid cross section is 2.6: 1 with the ratio of height; 0.73: 1 with the ratio of height at the bottom of second cross gate trapezoid cross section.
First ingate sprue gate 41, ingate sprue gate 31, second is truncated cone-shaped, and the intracavity section at truncated cone-shaped sprue gate gradually becomes, and it is 2.25: 1 that molten metal inflow end flows out end cross-sectional area ratio with molten metal.
In embody rule, when molten metal bath flows through step gating system of the present invention, molten metal bath flows into the first cross gate 3, second cross gate 4 by sprue 2, and injecting cast model by respective sprue gate, filling time is shorter, and thermal loss reduces greatly, molten metal maintains good mobility, avoid the too early appearance of cold burden, the molten metal temperature entered in die cavity can be controlled preferably, greatly improve casting quality.First cross gate 3 and the second cross gate 4 have sufficient length and control molten metal flow direction, and the first cross gate, the second cross gate are isolated mutually, are not interfere with each other, can effectively prevent molten metal from forming turbulent flow, avoid entrained gas in molten metal, and then effectively avoid foundry goods to produce shrinkage cavity.The cross sectional shape of the first cross gate 3, second cross gate 4 is trapezoidal, because the cross gate molten metal thermal loss of trapezoid cross section is little, easy to process.And in the present invention, the second cross gate 4 sectional dimension is greater than the sectional dimension of the first cross gate 3, well can easily produce Shrinkage cavity position to bottom half and carry out feeding, greatly reduce Shrinkage cavity defect, improve casting quality.
In specifically arranging, cup 1 specification is diameter 240mm, high 120mm.Described sprue 2 cross section is circular, and be of a size of sprue diameter 50mm, high 600mm, bottom is gradual change, is gradient to diameter 50mm by diameter 70mm, high 250mm.Sprue 2 is positioned at casing one middle side part, apart from casing 120mm; First cross gate 3 cross section is trapezoidal, and sectional dimension is upper base 45mm, and go to the bottom 65mm, high 25mm, the end is 2.6: 1 with the ratio of height, its overall semicircular in shape, both sides, around tank top, second cross gate 4 cross section is similarly trapezoidal, upper base 34mm, go to the bottom 44mm, high 60mm, the end is 0.73: 1 with the ratio of height, is positioned at the thick large part place of bottom half.First ingate sprue gate, the second ingate sprue gate are truncated cone-shaped, cavity volume gradual change, and minimum cross-section is diameter 20mm, and maximum cross section is diameter 30mm, and sprue gate entrance is 2.25: 1 with the ratio of discharge area.First ingate sprue gate 31 is positioned at boss place, both sides, gear box top, and the second ingate sprue gate 41 is positioned at thick large part place bottom gear box.Through test measuring and calculating, adopt running gate system of the present invention to carry out gear box cast, filling time is 47.28s; Setting time is 3159.4s; Maximum contraction cavity ratio is 0.707%, effectively improves casting quality.

Claims (4)

1. an evaporative pattern running gate system for gear box, is characterized in that:
Sprue (2) is set, described sprue is communicated with cup (1), the first cross gate (3) and the second cross gate (4) from top to bottom successively, and described first cross gate (3) and the respective radial communication along described sprue of the second cross gate (4) are on sprue (2); Further, the first ingate sprue gate (31), the second ingate sprue gate (41) is respectively equipped with at the first cross gate, the second cross gate away from the end of sprue;
Described first cross gate (3) is totally semicircle, and described sprue is in the middle part of semicircle first cross gate, and two first ingate sprue gates (31) point of described first cross gate end are in gear box first half both sides.
2. the evaporative pattern running gate system of a kind of gear box according to claim 1, it is characterized in that, described second cross gate is two, and form V-shaped, two the second ingate sprue gates (41) of the second cross gate end are in thick large part place bottom gear box.
3. the evaporative pattern running gate system of a kind of gear box according to claim 1, it is characterized in that, the cross section of described first cross gate (3), the second cross gate (4) is trapezoidal, and wherein, the end of the first cross gate trapezoid cross section is 2.6:1 with the ratio of height; 0.73:1 with the ratio of height at the bottom of second cross gate trapezoid cross section.
4. the evaporative pattern running gate system of a kind of gear box according to claim 1, it is characterized in that, described first ingate sprue gate (31), the second ingate sprue gate (41) are truncated cone-shaped, and the intracavity section at truncated cone-shaped sprue gate gradually becomes, it is 2.25:1 that molten metal inflow end flows out end cross-sectional area ratio with molten metal.
CN201410023882.3A 2014-01-17 2014-01-17 A kind of evaporative pattern running gate system of gear box Active CN103736928B (en)

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CN104550890A (en) * 2014-12-26 2015-04-29 宁夏共享装备有限公司 Pouring system for reducing mold filling speed in pouring gate
CN104815962A (en) * 2015-03-30 2015-08-05 共享装备有限公司 Molten iron filtering apparatus for casting
CN104874741B (en) * 2015-06-05 2016-09-07 临汾鹏泰伟业有限公司 A kind of metallic magnesium refining pot manufacturing process
CN107199314B (en) * 2017-03-23 2019-01-18 山东银光钰源轻金属精密成型有限公司 A kind of 18KW video display lamps and lanterns front frame sand mould casting method
CN106955994B (en) * 2017-05-19 2019-02-26 河南科技大学 The temperature control type staged pouring procedure and staged casting device of casting
CN107755640A (en) * 2017-10-27 2018-03-06 襄阳新金开泵业有限公司 A kind of pouring procedure
CN109277526B (en) * 2018-11-07 2020-09-18 阜新力达钢铁铸造有限公司 Casting method of die casting machine template for thick and large-section ductile iron
CN109550903B (en) * 2018-12-10 2020-06-02 中国船舶重工集团公司第十二研究所 Precision casting forming method for thin-wall variable-section casting
CN110039007B (en) * 2019-05-05 2020-06-09 合肥江淮铸造有限责任公司 Cylinder body casting gating system
CN112139454A (en) * 2020-09-30 2020-12-29 大连金河铸造有限公司 Improved slag stopping structure and method for pouring system

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