CN104550734A - Dewaxing method for investment casting, and special screw device for implementing method - Google Patents
Dewaxing method for investment casting, and special screw device for implementing method Download PDFInfo
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- CN104550734A CN104550734A CN201510017859.8A CN201510017859A CN104550734A CN 104550734 A CN104550734 A CN 104550734A CN 201510017859 A CN201510017859 A CN 201510017859A CN 104550734 A CN104550734 A CN 104550734A
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- screw
- wax
- screw rod
- pattern
- shell
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
- B22C9/04—Use of lost patterns
- B22C9/043—Removing the consumable pattern
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
The invention discloses a dewaxing method for investment casting, and a special screw device for implementing the method. In the dewaxing process, firstly a screw is removed out from a wax mould, and then the wax mould in a shell is melted and poured out. The specific method is as follows: firstly the screw is heated, so that a wax coat adhered to the surface of a threaded end of the screw in the wax mould is melted, and the connection between the wax mould and the screw is loosened so as to facilitate workers to remove the screw out of the wax mould easily; the shell outside the wax mould out of which the screw is removed is heated, so that the wax mould in the shell is melted, and further a wax liquid in the shell can be conveniently poured; in the melting process of the wax mould in the shell, the screw is taken out in advance, so that the phenomena that the screw deflects or falls off due to the lack of restriction does not occur, the touch damage of the screw to the wall of the shell is also avoided, and thus the damage of the screw to the molded shell is avoided in the dewaxing process of the investment casting.
Description
Technical field
The present invention relates to a kind of process for dewaxing of model casting and be exclusively used in the screw device implementing the method.
Background technology
Model casting, also known as lost-wax casting, is a kind of important casting method.It comprises wax-pattern processed, molding group, hangs coating, stucco, dewaxing, shell processed, roasting, the operations such as cast.The shaping of alloy-steel casting such as carbon steel, steel alloy, heat-resisting alloy, stainless steel, Precise Alloy, copper alloy, aluminium alloy can adopt lost-wax casting.The casting dimension that the method is produced is accurate, and surface roughness is little, and can produce complex-shaped foundry goods.Conveniently carry out the extension coating of model casting, stucco process, in the process of actual production compacting wax-pattern, solid screw is pressed in wax-pattern.In traditional investment casting process, screw rod and handle depart from wax-pattern in dewaxing process, because now shell is made, the screw rod of metal material is in wax-pattern melting process, due to Action of Gravity Field, can produce shell inner surface dope layer and collide with, scratch, especially for thinner shell, may occur breaking up shell situation, thus significant impact is produced to the surface quality of final casting, and common screw material is all irony, in Reusability process, screw rod easily gets rusty, like this in follow-up dewaxing process, while taking-up screw rod, iron rust on screw rod can and dewaxing to mix pollution wax-pattern.And, by with in the fusible pattern of solid screw and foundry goods fusible pattern connection procedure, due to the existence of screw rod, be difficult to modify to running channel fusible pattern, and not easily take out screw rod, bring very burden to work, reduce production efficiency.In addition, in the production process of different wax-pattern, according to the different size treating foundry goods, required spiro rod length is also different, and therefore need the screw rod of different length for subsequent use, this will cause the waste of material, also increase the preparatory period of model casting, reduce production efficiency.
Summary of the invention
The object of this invention is to provide a kind of process for dewaxing of model casting, be intended to solve screw rod in existing dewaxing process and easily damage the problem of shell.Another object of the present invention is to provide a kind of screw device being exclusively used in the process for dewaxing implementing described model casting simultaneously.
In order to realize above object, in the present invention, the technical scheme of the process for dewaxing of model casting is as follows:
The process for dewaxing of model casting, comprises the following steps:
Step one, with after the wax-pattern of screw rod makes shell, heats screw rod, and the wax coat sticking to screw surface to wax-pattern melts;
Step 2, extracts out screw rod from wax-pattern;
Step 3, heats the entirety of shell and wax-pattern, melts to the wax-pattern in shell, and the wax liquid after being melted by wax-pattern is poured out from shell.
In the present invention, the technical scheme of screw device is as follows:
Screw device, comprise and be fixed on the screw rod on wax-pattern and the handle for the confession staff gripping beyond wax-pattern that overhangs for plug-in mounting, one end of screw rod be provided with the externally threaded end of thread for the periphery of inserting in wax-pattern, the other end is fixing or the link that is integrally connected on handle, the link of screw rod offers the double thread end for heating rod inserts and carries out the heating jack heated, handle offers for heating rod through the rear PP pilot punch inserted in heating jack, PP pilot punch is communicated with heating jack.
Handle is by the removable link being fixedly connected on screw rod of syndeton.
The link of screw rod and handle form the expansion link that can stretch along screw axial by syndeton.
Syndeton comprises the sleeve portion and intercalation part that on the link of screw rod and handle, the corresponding sleeve arranged coordinates, and intercalation part is threaded in sleeve portion along screw axial.
Sleeve portion be heating jack or PP pilot punch wall surface of the hole on the connection step of annular of projection, the internal face connecting step is processed with internal thread.
Sleeve portion be heating jack wall surface of the hole on the connection step of projection, intercalation part is the outer peripheral face of one end be connected with the link of screw rod of handle.
Handle is the swivel nut that external diameter is less than the aperture of heating jack, and the periphery of swivel nut is provided with the external screw thread with the screw-internal thread fit be connected on step, and described PP pilot punch is the endoporus of swivel nut.
Heating jack is the central hole of the end face running through screw rod two ends, and central hole and screw coaxial are arranged.
Screw rod is the aluminium alloy body of rod or the stainless steel body of rod.
The operation that dewaxes in the present invention needs first to be extracted out from wax-pattern by screw rod, then the wax-pattern in shell is melted and pour out, specific practice is: first heated by screw rod, the wax coat sticked in wax-pattern on screw flight end surfaces is melted, connection between such wax-pattern and screw rod will there will be the phenomenon got loose, so that screw rod is extracted out from wax-pattern by staff easily; And then the shell heating outside the wax-pattern that screw rod removed, wax-pattern in shell is melted, very easily the wax liquid in shell can be poured out, and in the process that wax-pattern melts in shell, because screw rod is in front taking-up, so there will not be screw rod because lacking constraint deflection or the phenomenon that drops, also just avoid screw rod and damage is touched to the shell wall of shell, make screw rod in the dewaxing operation of model casting can not cause damage in type shell, thus solve screw rod in existing dewaxing process and easily to damage the problem of shell.
Accompanying drawing explanation
Fig. 1 is the structural representation of the embodiment of screw device of the present invention.
Detailed description of the invention
The embodiment of the process for dewaxing of model casting in the present invention: this process for dewaxing comprises the following steps:
Step one, with after the wax-pattern of screw rod makes shell, heats screw rod, and the wax coat sticking to screw surface to wax-pattern melts;
Step 2, extracts out screw rod from wax-pattern;
Step 3, heats the entirety of shell and wax-pattern, melts to the wax-pattern in shell, and the wax liquid after being melted by wax-pattern is poured out from shell.
Be exclusively used in the embodiment of the screw device of the process for dewaxing implementing above-mentioned model casting in the present invention: this screw device is a kind of screw device of precisely casting wax mold mould, be formed by connecting by screw rod 2 and handle 5 two parts.The front end of screw rod 2 is insert the end of thread in wax-pattern, rear end is the link of connecting handle 5, and the central hole that front and back pipe passes through is offered at the center of screw rod 2, this central hole is the heating jack inserted for heating rod, and the external screw thread 1 extended before and after the periphery of the end of thread is processed with, the aperture place of the central hole of link is provided with the connection step 3 of projection on the wall surface of the hole of central hole, the front ring end face connecting step 3 is in central hole and interval at externally threaded rear, the rear ring end face connecting step 3 is concordant with the ring end face of link, and connection internal thread is processed with on the inner ring wall connecting step 3.The swivel nut that handle 5 extends for front and back, the periphery of swivel nut offers and the connection external screw thread 4 being connected internal thread and mating, be less than the aperture of the central hole of screw rod 2 to make the large footpath of swivel nut but equal the large footpath of the connection internal thread connected on step 3, the endoporus of swivel nut is be communicated with the heating jack of screw rod 2, insert the PP pilot punch heated in jack for heating rod through rear, and after connecting internal thread and being connected external screw thread 4 connection, screw rod 2 and handle 5 form expansion link that can be elastic.
In the present embodiment, the screw rod 2 of screw device is designed to cored screw, when needs screw device is separated from wax-pattern, heating rod can be inserted in the heating jack of screw rod 2, after the temperature of screw rod 2 raises, melt the wax coat contacted with it, just directly can extract screw rod 2 out from wax-pattern, hollow-core construction also plays the effect of weight reduction simultaneously, so that pull and push operation, reduce the labour intensity of workman.As further design, whole screw device is divided into screw rod 2 and handle 5 two parts, wherein handle 5 spinning is in the rear end of screw rod 2, can the position of regulating handle 5 on screw rod 2 easily, thus the adjustment realized whole screw device length, make same screw device be applicable to different wax-pattern, improve the versatility of whole screw device.
In the present embodiment, in whole screw device, screw rod 2 and handle 5 all adopt aluminum alloy materials to make, and classic screw adopts the materials such as cast iron, and by contrast, in the present embodiment, the quality of screw device is light, antirust ability strong, can not pollute wax-pattern.Hollow screw rod 2 makes heating rod to insert easily, so that screw rod 2 is separated from wax-pattern, this is simple to operation, saves time, and facilitates follow-up casting process, enhances productivity.Whole screw device adopts two-part structure, be threaded connection and realize removable being connected, so just can adjust the total length of whole screw device easily, screw device can be made to be applicable to the lost wax casting of different length demand, increase the practicality of screw device, save material.In whole screw device, screw rod 2 and handle 5 all adopt hollow-core construction, will alleviate the weight of whole screw device like this, save human and material resources.
In the present embodiment with the wax-pattern of screw device from after Wax mold takes out, heating rod is inserted in the heating jack of screw rod 2 and heats, melt after screw rod 2 heating around after one deck cere, can screw device be extracted out; The length of whole screw device can be regulated by rotary handle 5 simultaneously.
In the above-described embodiments, screw rod and handle rely on to connect internal thread and connect being threaded between external screw thread and realize adjustable fixing, in other embodiments, the periphery of handle can also install the locking nut after being in screw rod additional, after the relative position locking between screw rod and handle, by screwing locking nut by handle locking on screw rod, handle and screw rod is made to form an entirety.In addition, the modes such as handle and screw rod also can be connected by Flange joint, porous pin, the connection of elongated hole pin realize that Telescopic shaft type is adjustable to be connected, and also can be realized by modes such as bonding, welding, one connection between handle and screw rod can not mode connection.
In the above-described embodiments, the heating jack in screw rod is perforation, and in other embodiments, this heating jack also can be only the blind hole that the rear end of screw rod is offered.
Claims (10)
1. the process for dewaxing of model casting, is characterized in that, comprises the following steps:
Step one, with after the wax-pattern of screw rod makes shell, heats screw rod, and the wax coat sticking to screw surface to wax-pattern melts;
Step 2, extracts out screw rod from wax-pattern;
Step 3, heats the entirety of shell and wax-pattern, melts to the wax-pattern in shell, and the wax liquid after being melted by wax-pattern is poured out from shell.
2. be exclusively used in the screw device of the process for dewaxing implementing model casting as claimed in claim 1, comprise and be fixed on the screw rod on wax-pattern and the handle for the confession staff gripping beyond wax-pattern that overhangs for plug-in mounting, one end of screw rod is be provided with the externally threaded end of thread for the periphery of inserting in wax-pattern, the other end is link that is fixing or that be integrally connected on handle, it is characterized in that, the link of screw rod offers the double thread end for heating rod inserts and carries out the heating jack heated, handle offers for heating rod through the rear PP pilot punch inserted in heating jack, PP pilot punch is communicated with heating jack.
3. screw device according to claim 2, is characterized in that, handle is by the removable link being fixedly connected on screw rod of syndeton.
4. screw device according to claim 3, is characterized in that, the link of screw rod and handle form the expansion link that can stretch along screw axial by syndeton.
5. screw device according to claim 4, is characterized in that, syndeton comprises the sleeve portion and intercalation part that on the link of screw rod and handle, the corresponding sleeve arranged coordinates, and intercalation part is threaded in sleeve portion along screw axial.
6. screw device according to claim 5, is characterized in that, sleeve portion be heating jack or PP pilot punch wall surface of the hole on the connection step of annular of projection, the internal face connecting step is processed with internal thread.
7. screw device according to claim 6, is characterized in that, sleeve portion be heating jack wall surface of the hole on the connection step of projection, intercalation part is the outer peripheral face of one end be connected with the link of screw rod of handle.
8. screw device according to claim 7, is characterized in that, handle is the swivel nut that external diameter is less than the aperture of heating jack, and the periphery of swivel nut is provided with the external screw thread with the screw-internal thread fit be connected on step, and described PP pilot punch is the endoporus of swivel nut.
9. screw device as claimed in any of claims 2 to 8, is characterized in that, heating jack is the central hole of the end face running through screw rod two ends, and central hole and screw coaxial are arranged.
10. screw device as claimed in any of claims 2 to 8, is characterized in that, screw rod is the aluminium alloy body of rod or the stainless steel body of rod.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510017859.8A CN104550734A (en) | 2015-01-14 | 2015-01-14 | Dewaxing method for investment casting, and special screw device for implementing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510017859.8A CN104550734A (en) | 2015-01-14 | 2015-01-14 | Dewaxing method for investment casting, and special screw device for implementing method |
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| CN104550734A true CN104550734A (en) | 2015-04-29 |
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| CN201510017859.8A Pending CN104550734A (en) | 2015-01-14 | 2015-01-14 | Dewaxing method for investment casting, and special screw device for implementing method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108746496A (en) * | 2018-06-01 | 2018-11-06 | 中国航发北京航空材料研究院 | A kind of moltening mold castings shell preparation method |
| CN108994259A (en) * | 2018-08-20 | 2018-12-14 | 西安科技大学 | A kind of essence casting device for art work hot investment casting |
| CN109014038A (en) * | 2018-10-16 | 2018-12-18 | 北京星航机电装备有限公司 | A method of reducing shell spalling in precision-investment casting dewaxing process |
| CN113524124A (en) * | 2021-07-13 | 2021-10-22 | 哈尔滨电气动力装备有限公司 | Double-thread hollow screw fastening hydraulic tool for wet winding motor |
Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63194842A (en) * | 1987-02-10 | 1988-08-12 | Mazda Motor Corp | Dewaxing method for lost wax casting |
| CN201405040Y (en) * | 2009-04-08 | 2010-02-17 | 宁波通达精密铸造有限公司 | Rod core used for hanging module groups on investment casting shell-making production line |
| CN201872274U (en) * | 2010-10-14 | 2011-06-22 | 安徽应流铸业有限公司 | Low-temperature wax wooden handle applicable to steam dewaxing |
| CN202701297U (en) * | 2012-07-23 | 2013-01-30 | 泰州鑫宇精密铸造有限公司 | Wax mould hanging tool quick-replacing structure |
| CN202762976U (en) * | 2012-09-04 | 2013-03-06 | 桐乡合德机械有限公司 | Automatic sand core demolding mechanism of screw compressor rotor |
| CN103567380A (en) * | 2012-07-23 | 2014-02-12 | 泰州鑫宇精密铸造有限公司 | Wax mould quick-changing structure |
| CN204396794U (en) * | 2015-01-14 | 2015-06-17 | 洛阳鹏起实业有限公司 | A kind of screw device of model casting |
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2015
- 2015-01-14 CN CN201510017859.8A patent/CN104550734A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63194842A (en) * | 1987-02-10 | 1988-08-12 | Mazda Motor Corp | Dewaxing method for lost wax casting |
| CN201405040Y (en) * | 2009-04-08 | 2010-02-17 | 宁波通达精密铸造有限公司 | Rod core used for hanging module groups on investment casting shell-making production line |
| CN201872274U (en) * | 2010-10-14 | 2011-06-22 | 安徽应流铸业有限公司 | Low-temperature wax wooden handle applicable to steam dewaxing |
| CN202701297U (en) * | 2012-07-23 | 2013-01-30 | 泰州鑫宇精密铸造有限公司 | Wax mould hanging tool quick-replacing structure |
| CN103567380A (en) * | 2012-07-23 | 2014-02-12 | 泰州鑫宇精密铸造有限公司 | Wax mould quick-changing structure |
| CN202762976U (en) * | 2012-09-04 | 2013-03-06 | 桐乡合德机械有限公司 | Automatic sand core demolding mechanism of screw compressor rotor |
| CN204396794U (en) * | 2015-01-14 | 2015-06-17 | 洛阳鹏起实业有限公司 | A kind of screw device of model casting |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108746496A (en) * | 2018-06-01 | 2018-11-06 | 中国航发北京航空材料研究院 | A kind of moltening mold castings shell preparation method |
| CN108994259A (en) * | 2018-08-20 | 2018-12-14 | 西安科技大学 | A kind of essence casting device for art work hot investment casting |
| CN108994259B (en) * | 2018-08-20 | 2020-04-17 | 西安科技大学 | A smart device of casting for work of art precision casting |
| CN109014038A (en) * | 2018-10-16 | 2018-12-18 | 北京星航机电装备有限公司 | A method of reducing shell spalling in precision-investment casting dewaxing process |
| CN113524124A (en) * | 2021-07-13 | 2021-10-22 | 哈尔滨电气动力装备有限公司 | Double-thread hollow screw fastening hydraulic tool for wet winding motor |
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Address after: 471023 Henan Province, Luoyang city Luolong District Yuwen Kai Street No. 67 Applicant after: LUOYANG PENGQI INDUSTRIAL CO., LTD. Address before: Kaiyuan Avenue, Luolong District 471000 in Henan province Luoyang City, No. 248 Continental Mansion 818 Applicant before: LUOYANG PENGQI INDUSTRIAL CO., LTD. |
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Application publication date: 20150429 |