CN101530892B - Investment casting thin-walled part casting method - Google Patents

Investment casting thin-walled part casting method Download PDF

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Publication number
CN101530892B
CN101530892B CN2009100972924A CN200910097292A CN101530892B CN 101530892 B CN101530892 B CN 101530892B CN 2009100972924 A CN2009100972924 A CN 2009100972924A CN 200910097292 A CN200910097292 A CN 200910097292A CN 101530892 B CN101530892 B CN 101530892B
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China
Prior art keywords
wax
pattern
casting
mould
foundry goods
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CN2009100972924A
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Chinese (zh)
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CN101530892A (en
Inventor
王亚伟
杨银岐
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宁波通达精密铸造有限公司
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Publication of CN101530892A publication Critical patent/CN101530892A/en
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Publication of CN101530892B publication Critical patent/CN101530892B/en

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Abstract

An investment casting thin-walled part casting method is disclosed, comprising the following steps of: (1) manufacturing the mould of a wax pattern; (2) manufacturing the wax pattern; (3) welding the wax pattern and a pouring wax rod group to a module; (4) shell making; (5) de-waxing; (6) roasting the shell; (7) pouring; (8) cleaning the shell; (9) heat treatment; (10) removing reinforcing ribs, implementing root polishing and ball blasting; the mould manufacturing of the wax pattern comprises that a mould is provided with two parallel cast cavities between which a plurality of channel holes are arranged; the wax manufacturing comprises that: the wax is injected into the mould of the wax pattern at first and then the wax pattern is de-moulded after being cooled, therefore, the shaped wax pattern is of a catamaran-type structure, and wax-made reinforcing ribs equal to the number of the channels in the step (1) are arranged between the catamaran-type structure. Compared with the prior art, the invention has the characteristics of being difficult of deformation, high rate of finished products and high benefit.

Description

Investment casting thin-walled part casting method

Technical field:

The present invention relates to the model casting field, particularly relate to a kind of investment casting thin-walled part casting method.

Background technology:

Model casting (claiming hot investment casting and lost-wax casting again) is to use one of Special Processes of Metal Castings method extremely widely, and its product relates to every field, and foundry goods annual production average annual growth both at home and abroad impressively ranks top in the Special Processes of Metal Castings method.

The investment-casting characteristics are:

1, dimensional accuracy height, surface smoothness is good;

2, can cast the foundry goods of differing complexity;

3, can cast book light casting below 0.5 millimeter and below 0.1 kilogram;

4, be not subjected to the restriction of alloy species;

5, can mechanization or a large amount of productions of half on-mechanicalization and manual limited production.

Present domestic model casting producer is various, but the method for prior art 80% all is the waterglass production technology that has adopted the low temperature wax material, especially in Yangtze River Delta Region, and sand-cast or structural member outside the foundry goods subrogate country of a large amount of these type of explained hereafter of annual outlet.But the critical defect that low temperature wax material waterglass production technology exists is that foundry goods is yielding, and especially book wall foundry goods is more remarkable, the foundry goods of having relatively high expectations is had only by artificial shaping of later stage or machining mode make up.

Cause the main cause of casting deformation to be:

1, in the low temperature wax material paraffin-the stearic acid of common use by the wax material of average 50% allotment.Its fusing point is at 50~51 ℃, and heat endurance is about 31 ℃.When as seen surpassing 31 ℃, the wax-pattern particularly wax-pattern of thin-wall part just begins to have deformation tendency, and temperature is higher more serious.Present domestic summer temperature is being very common more than 31 ℃, especially more can be up to more than 40 ℃ in south, so the wax-pattern distortion is the main factor that causes casting deformation.

2, especially the thin-wall part wax-pattern is in the process of placing and moving for wax-pattern, and the effect that is subjected to stress is yielding.

3, thin-wall part is handled at postorder, especially very easily distortion in heat treatment process.

At present, although on the market a lot of in temperature or high temperature mould material in continuous release, because a lot of enterprise products are various in style, as change wax material, because different wax material shrinkage factor differences, will cause a large amount of moulds will repair maybe can not use, and direct losses will millions of units.Therefore considerable enterprise would rather carry out modified product the postorder reparation, carry out machining or scrap processing and also can not change the low temperature wax material easily in the prior art.So how to solve that the foundry goods of low temperature wax material waterglass production technology is yielding, the rate of reducing the number of rejects and seconds and to increase the benefit be the difficult problem that numerous model casting producer faces.

Summary of the invention:

The present invention is directed to above problem provides the original wax material of a kind of maintenance constant, and the investment casting thin-walled part casting method of difficult of deformation, yield rate height and high efficiency when possessing original advantage.

The present invention overcomes the above problems used technical scheme: a kind of investment casting thin-walled part casting method, and it may further comprise the steps:

1., the Mold Making of wax-pattern; 2., wax-pattern is made; 3., wax-pattern becomes module with cast rod wax assembly welding; 4., system shell; 5., dewaxing; 6., formwork roasting; 7., cast; 8., formwork cleaning; 9., heat treatment; 10., remove reinforcement, and carry out the root reconditioning; , Shot Blasting, the Mold Making of described wax-pattern is meant, is provided with two parallel foundry goods die cavitys at a mould, is provided with several access openings between two die cavitys; Described wax-pattern is made and is meant that at first the mould to wax-pattern carries out casting, demolding after cooling again, and then the wax-pattern after the moulding is the catamaran type structure, is provided with between the binary and the step wax system reinforcement that 1. the passage number is identical.

After adopting above method, the present invention compared with prior art, because the wax-pattern after the moulding is the structure of catamaran type, be provided with several wax system reinforcements between the binary, reinforcement has played the effect of strengthening to the thin-wall part wax-pattern, then pour into a mould the thin-wall part that comes out and also be the catamaran type structure, also just form reinforcement between the binary naturally and strengthen; And when heat treatment, thin-wall part is the catamaran type bulk heat treatmet.So difficult of deformation of the present invention, yield rate height and high efficiency.

The specific embodiment:

Below in conjunction with concrete embodiment, the present invention is described further:

Embodiment 1

With length is 1200mm, and width is 300mm, and thickness is 15mm, and requiring flatness is that the mining equiment of 1.5mm is an example with the abrasion-proof backing block foundry goods:

A kind of investment casting thin-walled part casting method, it may further comprise the steps:

1., the Mold Making of wax-pattern: a mould is provided with two parallel abrasion-proof backing block foundry goods die cavitys, and every 200mm is provided with an access opening between two length directions of two foundry goods die cavitys, and then a length direction is 7 access openings, and totally 2 row are provided with 14 access openings;

2., wax-pattern is made: at first the mould to wax-pattern carries out casting, demolding after cooling again, then the wax-pattern after the moulding is the catamaran type structure, then form and the step wax system reinforcement that 1. the passage number is identical between the binary, catamaran type wax-pattern after the demoulding uprightly is placed on the flat board, behind the cooling 8h, 50 groups (100) were advanced wax-pattern planarity checking (method of inspection is conventional method in common), all met the requirements less than 1.5mm;

3., wax-pattern becomes module with cast rod wax assembly welding: the sprue gate of catamaran type structure wax-pattern is shared at two wax-patterns in catamaran type wax-pattern middle part, once welds during with cast rod wax bond pads to get final product;

4., the system shell: the module that assembly welding is good is by hanging fireproof coating, stucco, curing agent cured coating, air dry, repetitive operation is 7 times like this, the refractory material duricrust that forms certain thickness at the outer surface of module is a formwork;

5., dewaxing: the formwork that makes is placed in the container of dewaxing, heats by hot water, the wax in the formwork is melted lose, formwork forms cavity;

6., formwork roasting: the roasting in the roasting cellar for storing things of the formwork after will dewaxing was taken out after 1.5 hours;

7., cast: in the formwork roasting process, it is qualified that molten steel has melted, and pour steel formation foundry goods is removed after the cooling in the formwork;

8., formwork cleaning: manually will be coated on fireproof coating formwork outside the foundry goods and clean out and expose foundry goods with the hammering mode;

9., heat treatment: with the whole heating of couple structure foundry goods uniform temperature, in water, cool off (quenching), and then integral body heats uniform temperature, cooling (tempering) in air;

10., remove reinforcement, and carry out the root reconditioning: 14 reinforcements that will be connected between the couple structure foundry goods with gas cutting slice off, and with abrasive grinding wheel with reinforcement root equating residual on the product;

, Shot Blasting: product is suspended in the shot-blasting machine, with shot the oxide skin of product surface is removed and exposed the metal true qualities.

3. above step arrives step All adopt common process and method.

After above step was finished, 100 abrasion-proof backing block foundry goods were through check, have 98 qualified, other has 2 needs finishings.And adopt the technology of prior art single-cast, in wax-pattern is made, make 100 wax-patterns, have only 88 wax-patterns qualified through check, through after the follow-up step, 88 foundry goods of casting complete are after the process heat treatment process, and flatness is all above 1.5mm, the maximum 9mm that reaches all need just meet the requirements through after the finishing in later stage.

Embodiment 2

With length is 500mm, and width is 50mm, and thickness is 6mm, and requiring flatness is that the engineering machinery of 1.0mm is an example with the fin foundry goods:

A kind of investment casting thin-walled part casting method, it may further comprise the steps:

1., the Mold Making of wax-pattern: a mould is provided with two parallel fin foundry goods die cavitys, and every 160mm is provided with an access opening between two length directions of two foundry goods die cavitys, and then a length direction is 4 access openings, and totally 2 row are provided with 8 access openings;

2., wax-pattern is made: at first the mould to wax-pattern carries out casting, demolding after cooling again, then the wax-pattern after the moulding is the catamaran type structure, then form and the step wax system reinforcement that 1. the passage number is identical between the binary, catamaran type wax-pattern after the demoulding uprightly is placed on the flat board, behind the cooling 8h, 50 groups (100) were advanced wax-pattern planarity checking (method of inspection is conventional method in common), all met the requirements less than 1.0mm;

3., wax-pattern becomes module with cast rod wax assembly welding: the sprue gate of catamaran type structure wax-pattern is shared at two wax-patterns in catamaran type wax-pattern middle part, once welds during with cast rod wax bond pads to get final product;

4., the system shell: the module that assembly welding is good is by hanging fireproof coating, stucco, curing agent cured coating, air dry, repetitive operation is 5 times like this, the refractory material duricrust that forms certain thickness at the outer surface of module is a formwork;

5., dewaxing: the formwork that makes is placed in the container of dewaxing, heats by hot water, the wax in the formwork is melted lose, formwork forms cavity;

6., formwork roasting: the roasting in the roasting cellar for storing things of the formwork after will dewaxing was taken out after 1.5 hours;

7., cast: in the formwork roasting process, it is qualified that molten steel has melted, and pour steel formation foundry goods is removed after the cooling in the formwork;

8., formwork cleaning: manually will be coated on fireproof coating formwork outside the foundry goods and clean out and expose foundry goods with the hammering mode;

9., heat treatment: with the whole heating of couple structure foundry goods uniform temperature, in water, cool off (quenching), and then integral body heats uniform temperature, cooling (tempering) in air;

10., remove reinforcement, and carry out the root reconditioning: 14 reinforcements that will be connected between the couple structure foundry goods with gas cutting slice off, and with abrasive grinding wheel with reinforcement root equating residual on the product;

, Shot Blasting: product is suspended in the shot-blasting machine, with shot the oxide skin of product surface is removed and exposed the metal true qualities.

3. above step arrives step All adopt common process and method, just do not describing in detail here.

After above step was finished, 100 fin foundry goods were through check, have 99 qualified, other has 1 needs finishing.And adopt the technology of prior art single-cast, in wax-pattern is made, make 100 wax-patterns, have only 90 wax-patterns qualified through check, through after the follow-up step, 90 foundry goods of casting complete are after the process heat treatment process, and flatness is all above 1.0mm, the maximum 5mm that reaches all need just meet the requirements through after the finishing in later stage.Therefore produce wax-pattern and difficult of deformation, yield rate height and high efficiency with the present invention.

Above embodiment only is a preferable embodiment of the present invention, the present invention also allows other and changes, and is all in the scope of claim 1, all in the protection domain of claim of the present invention.

Claims (3)

1. investment casting thin-walled part casting method, it may further comprise the steps:
1., the Mold Making of wax-pattern; 2., wax-pattern is made; 3., wax-pattern becomes module with cast rod wax assembly welding; 4., system shell; 5., dewaxing; 6., formwork roasting; 7., cast; 8., formwork cleaning; 9., heat treatment; 10., remove reinforcement, and carry out the root reconditioning; , Shot Blasting, it is characterized in that: the Mold Making of described wax-pattern is meant, is provided with two parallel foundry goods die cavitys at a mould, is provided with several access openings between two die cavitys; Described wax-pattern is made and is meant that at first the mould to wax-pattern carries out casting, demolding after cooling again, and then the wax-pattern after the moulding is the catamaran type structure, is provided with between the binary and the step wax system reinforcement that 1. the passage number is identical.
2. investment casting thin-walled part casting method according to claim 1 is characterized in that: described step several access openings that are provided with in 1. are: every 150~250mm an access opening is set on two long limits of foundry goods die cavity.
3. investment casting thin-walled part casting method according to claim 2 is characterized in that: described step several access openings that are provided with in 1. are: every 200mm an access opening is set on two long limits of foundry goods die cavity.
CN2009100972924A 2009-03-31 2009-03-31 Investment casting thin-walled part casting method CN101530892B (en)

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Application Number Priority Date Filing Date Title
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Application Number Priority Date Filing Date Title
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CN101530892B true CN101530892B (en) 2011-01-05

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Cited By (1)

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TWI561139B (en) * 2012-06-18 2016-12-01 Shu-Yuan Liao

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CN101829776B (en) * 2010-05-26 2012-12-12 中国科学院金属研究所 Method for preparing high-temperature alloy thin wall cast with fine structure
CN101954454A (en) * 2010-10-14 2011-01-26 安徽应流集团霍山铸造有限公司 Method for eliminating casting heating cracks
CN101954455A (en) * 2010-10-14 2011-01-26 安徽应流集团霍山铸造有限公司 Method for removing heat cracks of framed-structure casting
CN102078919B (en) * 2010-12-17 2012-07-25 西安西工大超晶科技发展有限责任公司 Precision casting method of double-layer thin-wall bent pipe casting
CN102019353B (en) * 2010-12-17 2015-03-18 西安西工大超晶科技发展有限责任公司 Precision casting molding method for complex thin-walled member
CN102248125B (en) * 2011-06-25 2014-04-30 深圳技师学院 Simplified process method of lost wax casting
CN102266905A (en) * 2011-07-08 2011-12-07 山东泰山钢铁集团有限公司 Manufacturing process of part shell with location hole
CN102423794A (en) * 2011-12-03 2012-04-25 江苏欧玛机械有限公司 Process for manufacturing high-strength lifting appliance head for building
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TWI561139B (en) * 2012-06-18 2016-12-01 Shu-Yuan Liao

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