CN104741544A - Method for controlling shrinking percentage of curve cylinder body castings - Google Patents
Method for controlling shrinking percentage of curve cylinder body castings Download PDFInfo
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- CN104741544A CN104741544A CN201310749044.XA CN201310749044A CN104741544A CN 104741544 A CN104741544 A CN 104741544A CN 201310749044 A CN201310749044 A CN 201310749044A CN 104741544 A CN104741544 A CN 104741544A
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- curve
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- cylindrical shell
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
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- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
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Abstract
The invention discloses a method for controlling shrinking percentage of curve cylinder body castings. The method comprises the following steps: generating an outline curve of a cylinder body by means of rich equation curves in 2D drawing software, obtaining the wall thickness of the cylinder body through the translation function of the 2D drawing software, and drawing an axial sectional view of the cylinder body; introducing a 2D graphic into 3D drawing software capable of zooming the X direction, the Y direction and the Z direction singly, and zooming the 2D graphic according to the axial and radial shrinking percentage requirements of the cylinder body castings to generate a 3D entity graph; then introducing the 3D entity graph into a numerical control processing center to process an outer die and a core die of curve cylinder bodies, and casting the curve cylinder bodies by adopting the outer die and the core die. X ray and fluorescent inspection prove that the internal quality of the curve cylinder bodies cast by the method completely satisfy the technical requirements, and machining, lineation detection and wall thickness size detection prove that the outline dimensions of the curve cylinder bodies completely satisfy the dimension precision requirements of the castings.
Description
Technical field
the present invention relates to a kind of control method of class of a curve cylindric casting shrinkage factor, belong to precision casting technology field.
Background technology
along with the develop rapidly of modern military science and technology, the front end profile of each model air defence weapon system substantially all adopts and more meets aerodynamic curvilinear equation and form streamlined cylinder part.These parts adopt casting usually, and because cylinder part is when casting, molten metal axial shrinkage in cooling procedure is obstructed less, and therefore cylinder part axial shrinkage factor in cooling procedure is greater than radial shrinkage ratio.Due to the particularity of class of a curve cylindrical shell, as still adopted the casting technique of common cylinder part, the parts cast out there will be the even technical requirement that cannot meet parts of wall unevenness owing to being subject to the inconsistent impact of shrinkage factor.This gives the design of parts casting technique mould undoubtedly, processing adds difficulty.
Summary of the invention
the object of the invention is to, a kind of control method of class of a curve cylindric casting shrinkage factor is provided, to solve casting mould design and the processing problems of class of a curve cylindrical shell, to meet the casting requirement of class of a curve cylinder part.
technical scheme of the present invention:
a kind of control method of class of a curve cylindric casting shrinkage factor, the method is the appearance curve utilizing equation curve abundant in 2D mapping software to generate cylindrical shell, and then the wall thickness of cylindrical shell is obtained by the translation functions in 2D mapping software, draw out the axial section of cylindrical shell; Again 2D figure is imported and can carry out separately X to, Y-direction, the 3D mapping software of Z-direction convergent-divergent, after requiring that 2D figure is carried out convergent-divergent according to the axis of cylindric casting and radial shrinkage ratio, generate 3D solid pattern; Then 3D solid pattern is imported external mold and the core that numerical control machining center processes class of a curve cylindrical shell, utilize external mold and core to complete the casting of class of a curve cylindrical shell.
in preceding method, described 2D mapping software adopts CAXA electronics two dimension chart board software.
in preceding method, described 3D mapping software adopts UG three-dimensional drawing software or I-DEAS three-dimensional drawing software.
in preceding method, described class of a curve cylindrical shell comprises direct tube section and curved section; The axial shrinkage rate A of class of a curve cylindrical shell is greater than radial shrinkage ratio B.
in preceding method, the inwall of described core forming curves class cylindric casting; The outer wall of external mold forming curves class cylindric casting, external mold is provided with gap running channel mould.
in preceding method, described core and external mold all adopt phenolic sand molding, and core and external mold are divided into two or more according to length, fit together when building again.
compared with prior art, the present invention adopts in the design process between current 2D and the 3D mapping software generally used and switches, complete the moulding of cabin body casting die, then nc program is generated, thus complete Mould Machining, no matter the mould processed like this is surface quality, or dimensional accuracy all steps on a new stage, thus ensures the dimensional accuracy of cabin body foundry goods.The class of a curve cylindrical shell that method of the present invention casts out is through X-ray and fluorescent inspection, and its internal soundness meets technical requirement completely, and appearance and size detects and wall thickness dimension detection through machined, line, meets the dimension precision requirement of this foundry goods completely.
Accompanying drawing explanation
fig. 1-1 is embodiment of the present invention tube structure figure to be processed;
fig. 1-2 is the right view of Fig. 1;
fig. 2 is the karman curve generated by CAXA electronics two dimension chart board;
fig. 3 is the karman curve entity of I-DEAS Software Create;
fig. 4-1 is the structural representation of one section of curved section external mold;
fig. 4-2 is right views of Fig. 4-1.
Detailed description of the invention
a kind of control method of class of a curve cylindric casting shrinkage factor, the method is the appearance curve utilizing equation curve abundant in 2D mapping software to generate cylindrical shell, and then the wall thickness of cylindrical shell is obtained by the translation functions in 2D mapping software, draw out the axial section of cylindrical shell; Again 2D figure is imported and can carry out separately X to, Y-direction, the 3D mapping software of Z-direction convergent-divergent, after requiring that 2D figure is carried out convergent-divergent according to the axis of cylindric casting and radial shrinkage ratio, generate 3D solid pattern; Then 3D solid pattern is imported external mold and the core that numerical control machining center processes class of a curve cylindrical shell, utilize external mold and core to complete the casting of class of a curve cylindrical shell.2D mapping software adopts CAXA electronics two dimension chart board software.3D mapping software adopts UG three-dimensional drawing software or I-DEAS three-dimensional drawing software.Class of a curve cylindrical shell comprises direct tube section and curved section; The axial shrinkage rate A of class of a curve cylindrical shell is greater than radial shrinkage ratio B.The inwall of core forming curves class cylindric casting; The outer wall of external mold forming curves class cylindric casting, external mold is provided with gap running channel mould.Core and external mold all adopt phenolic sand molding, and core and external mold are divided into two or more according to length, fit together when building again.
below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail, but not as any limitation of the invention.
Embodiment
this example is for certain model warhead cabin body foundry goods, the profile of these parts is as shown in Fig. 1-1 and Fig. 1-2, for cylinder part, total length 1408mm, cylindrical shell component curve section and straightway, and in card taking door curvilinear equation, axial 846 ~ 1815mm is curved section, back segment (1815 ~ 2254mm) is straightway, inner barrel is provided with 8 reinforcements and 4 weakening grooves vertically, and hoop is provided with 2 enhancing steel rings.Material is for being ZL201A alloy, and sand casting, T5 heat treatment, foundry goods type is I class foundry goods, and the technical standard of employing is GB1173-1995 and QJ169-1989.The internal structure of this Cang Ti foundry goods warhead cabin body foundry goods is comparatively simple, but cabin body is longer, and maximum outside diameter is φ 608mm, and internal soundness requires very high.Casting section thickness is 8.5mm, and the axiality of curved section and straightway is 0.25mm, and be 3.5 ± 0.5mm after wall thickness processing, dimension precision requirement is higher.Because the inner chamber smoothness requirements of cabin chaeta billet cast piece is also higher, in casting technique, adopt phenolic sand molding.
the mould of this warhead cabin body foundry goods is divided into core and external mold, and external mold and core are all divided into three sections: straight line portion is one section, and curved portion is evenly divided into two sections.The difference of external mold and core is that core forms cabin body cast inner wall, and external mold forms the outer wall of cabin body foundry goods, and external mold is provided with gap running channel mould.The outer wall of cabin body leaves allowance, machining after final removal running channel.
when carrying out straightway external mold and core design, due to the external mold of straightway and the machined of core tool also fairly simple.Axial and radial direction discharges shrinkage factor, the direct dimensioning of Mould Machining figure respectively.
when march line segment external mold and core design, the inner cavity size of cabin body is that the wall thickness moving to 8.5mm by appearance curve is formed, and after the length dimension of the straightway of inner chamber can first draw the contour structures of cabin body in a computer, directly measures.But in the 2D mapping software used at present, in AUTO CAD software, formula curve is fairly simple, the formula curve for complexity generates comparatively difficulty.In CAXA CAXA, formula curve drawing instrument is powerful, can generate comparatively complicated curve, and therefore the curved section of parts is generated by CAXA electronics two dimension chart board.Fig. 2 is the karman curve generated by CAXA electronics two dimension chart board, and the axial starting point of karman curve overlaps with 0 of CAXA electronics two dimension chart board software.
during designing mould, straightway and curved section can design respectively
1, the design of straightway mould
the axial length of karman curve is: (2254-1815)+(2254-1815) × 1.2%=444.268mm; Wherein: 1.2% is the axial shrinkage rate of straightway external mold.
the radial shrinkage ratio of straightway external mold is 1.1%, and the external diameter of external mold is: φ 608 × 1.1%=φ 614.688mm; Wherein: 1.1% is the radial shrinkage ratio of straightway external mold.
the shrinkage factor of straightway core is 1.2%, and directly measuring deliver from vault body core cavity length of straigh line is in a computer 438.97mm, and namely the axial length of core is: 438.97 × 1.2%=444.23764mm;
core box radial shrinkage ratio is 1.1%, and the internal diameter of core box is: (φ 608-8.5 × 2) × 1.1%=φ 597.501mm;
straightway external mold is relative with core processing simple, and common heavy duty machine tools just can be processed.
2, the design of curved section mould
warhead cabin body foundry goods, anterior in course, get karman curve 846 ~ 1815mm section and control its profile, in the external mold and core design process of curved section, if discharge shrinkage factor from karman curve equation, must be connected with straightway at 1815mm place, external diameter is φ 608 × 1.1%=φ 614.688mm, after axially discharging shrinkage factor, the profile of whole cabin body is mobile along front portion, course, although radial direction has discharged shrinkage factor, cabin body wall is thick also can be thickened.If discharge shrinkage factor from front end 846mm, also must be connected with straightway at 1815mm place, that is, in equation, being more than or equal to 1815mm section is all control its profile by straight line, and this can increase the length of straightway undoubtedly, do not conform to the profile of cabin body, after follow-up machined, the position wall thickness formed at 1815 ~ 1836.78mm can be thinning, do not reach the wall thickness requirement of cabin body.
in general 2D mapping software, overallly can only amplify, shrinkage factor can not be discharged separately with radial direction vertically.In the external mold and core design process of curved section, CAXA electronics two dimension chart board can be adopted to generate karman curve, get 846 ~ 1815mm section and proceed in 3D software.In 3D mapping software, in the sketch drafting instrument of SlolidWorks lowest version, equation function is fairly simple, and the generation for the curve of this kind of more complicated of karman curve is very difficult, and for the 3D entity generated, discharging separately shrinkage factor in axis and radial direction can not realize.At present, only comparatively complicated curve can be imported in UG mapping software or I-DEAS mapping software, also curve entity can be generated simultaneously.And UG mapping software or I-DEAS mapping software can also X to, Y-direction, Z-direction is discharged separately.By I-DEAS Software Create warhead cabin body foundry goods as shown in Figure 3.By the entity of generation at X to the shrinkage factor of discharging 1.2%, Y-direction and Z-direction discharge the shrinkage factor of 1.1%.Evenly be divided into two sections by discharging the entity curved section after shrinkage factor, inner chamber position forms internal mold, and profile position forms external mold, and on external mold, process dovetail groove assembling gap running channel mould.The external surface of external mold is curved surface, but dovetail groove can be processed into and faces directly, on the one hand good processing, and be convenient to withdrawing pattern on the other hand, external mold is as shown in Fig. 4-1 and Fig. 4-2.
after Design of Dies is good, be connected with numerical control machining center by the interface on computer, completed the processing mold of mould by numerical control machining center.
Claims (6)
1. the control method of a class of a curve cylindric casting shrinkage factor, it is characterized in that: the method is the appearance curve utilizing equation curve abundant in 2D mapping software to generate cylindrical shell, and then the wall thickness of cylindrical shell is obtained by the translation functions in 2D mapping software, draw out the axial section of cylindrical shell; Again 2D figure is imported and can carry out separately X to, Y-direction, the 3D mapping software of Z-direction convergent-divergent, after requiring that 2D figure is carried out convergent-divergent according to the axis of cylindric casting and radial shrinkage ratio, generate 3D solid pattern; Then 3D solid pattern is imported external mold and the core that numerical control machining center processes class of a curve cylindrical shell, utilize external mold and core to complete the casting of class of a curve cylindrical shell.
2. method according to claim 1, is characterized in that: described 2D mapping software adopts CAXA electronics two dimension chart board software.
3. method according to claim 2, is characterized in that: described 3D mapping software adopts UG three-dimensional drawing software or I-DEAS three-dimensional drawing software.
4. method according to claim 2, is characterized in that: described class of a curve cylindrical shell comprises direct tube section and curved section; The axial shrinkage rate A of class of a curve cylindrical shell is greater than radial shrinkage ratio B.
5. method according to claim 1, is characterized in that: the inwall of described core forming curves class cylindric casting; The outer wall of external mold forming curves class cylindric casting, external mold is provided with gap running channel mould.
6. method according to claim 1, it is characterized in that: described core and external mold all adopt phenolic sand molding, core and external mold are divided into two or more according to length, fit together when building again.
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| CN201310749044.XA CN104741544B (en) | 2013-12-31 | 2013-12-31 | A kind of control method of class of a curve cylindric casting shrinking percentage |
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| CN201310749044.XA CN104741544B (en) | 2013-12-31 | 2013-12-31 | A kind of control method of class of a curve cylindric casting shrinking percentage |
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| CN104741544B CN104741544B (en) | 2018-05-25 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107008866A (en) * | 2017-06-22 | 2017-08-04 | 洛阳鹏起实业有限公司 | A kind of manufacturing process of cylindrical work pieces |
Citations (2)
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| US6696659B1 (en) * | 2001-01-31 | 2004-02-24 | Southeastern Tool & Die Company, Inc. | Method of forming a mold for a golf club grip |
| CN101920312A (en) * | 2010-08-21 | 2010-12-22 | 宜昌船舶柴油机有限公司 | Casting method and leveling tool for large multi-blade casting |
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- 2013-12-31 CN CN201310749044.XA patent/CN104741544B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6696659B1 (en) * | 2001-01-31 | 2004-02-24 | Southeastern Tool & Die Company, Inc. | Method of forming a mold for a golf club grip |
| CN101920312A (en) * | 2010-08-21 | 2010-12-22 | 宜昌船舶柴油机有限公司 | Casting method and leveling tool for large multi-blade casting |
Non-Patent Citations (4)
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| 乔礼洪: "CAD/CAM 在铸造模具设计和制造中的应用", 《铸造》 * |
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| CN107008866A (en) * | 2017-06-22 | 2017-08-04 | 洛阳鹏起实业有限公司 | A kind of manufacturing process of cylindrical work pieces |
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