CN114042867A - Local pressurizing process for casting box body - Google Patents
Local pressurizing process for casting box body Download PDFInfo
- Publication number
- CN114042867A CN114042867A CN202111419860.5A CN202111419860A CN114042867A CN 114042867 A CN114042867 A CN 114042867A CN 202111419860 A CN202111419860 A CN 202111419860A CN 114042867 A CN114042867 A CN 114042867A
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- China
- Prior art keywords
- casting
- piston
- pressurizing device
- determining
- box body
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D18/00—Pressure casting; Vacuum casting
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D27/00—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting
- B22D27/09—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure
- B22D27/11—Treating the metal in the mould while it is molten or ductile ; Pressure or vacuum casting by using pressure making use of mechanical pressing devices
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Casting Devices For Molds (AREA)
Abstract
The invention provides a local pressurization process using the pressurization device, which comprises the following steps: (1) determining the volume of a thick and large part of the casting body; (2) determining the margin of the support body end face increase according to the volume needing to be fed; (3) determining a stroke distance of the piston according to the increased margin; (4) determining the pressurization pressure according to the extrusion distance; (5) and (3) installing a pressurizing device at the thick part of the casting body, then pouring, and when the temperature displayed by the temperature measuring element reaches the solidification temperature, opening a ventilation switch, and compressing the support body by the piston. According to the local pressurization process for casting the box body, the pressurization device is additionally arranged on the casting mould, so that the problem that the density of a thick part can not be improved in a mode of placing a dead head and communicating an inner pouring gate due to the limitation of a product structure of a large complex aluminum alloy sand casting is solved.
Description
Technical Field
The invention belongs to the technical field of casting, and particularly relates to a local pressurizing process for casting a box body.
Background
In the gravity and antigravity casting production of aluminum alloy sand molds, in order to improve the density and performance indexes of thick and large parts of castings, the gravity casting usually adopts a method of arranging a riser at the thick and large parts of the castings for feeding. The anti-gravity casting is usually carried out by adopting a method that an inner sprue is communicated with the thick part and a riser is arranged at the thick part.
In general, when the gravity feeding direction of a heavy part of a gravity casting is consistent with that of a riser, a good feeding effect can be obtained by utilization, but when the gravity feeding direction of the heavy part of the casting is inconsistent with that of the riser, the feeding capability of the riser is limited, and the expected feeding effect is difficult to achieve.
Under the condition that the feeding direction of the thick and large part of the casting is consistent with the feeding direction of the inner sprue and the casting is communicated with the inner sprue, a good feeding effect can be obtained, but under the condition that the feeding direction of the thick and large part of the casting is inconsistent with the feeding direction of the inner sprue and the casting is not communicated with the inner sprue, the expected feeding effect is difficult to achieve. Therefore, the density of the thick and large parts of the castings is reduced due to the fact that effective feeding of the thick and large parts of the castings cannot be obtained, and finally the performance indexes of the castings are reduced or the castings are scrapped. The process innovation breaks through the limitation of the traditional process, realizes effective feeding of thick and large parts at different positions of the casting, improves the density and performance indexes of the thick and large parts, and obtains a high-quality casting, which is the key technology of the design.
Large castings are produced by adopting a gravity casting method or a counter-gravity casting method for many years. The casting is designed by adopting an anti-gravity casting process, and the casting completes the casting processes of mold filling, pressurization and pressure maintaining under the action of anti-gravity. The process method achieves the stable mold filling of the box body and the sequential solidification of the casting.
However, since the cylinder outside the casting cannot be communicated with the ingate, feeding of the cylinder can be realized only by a method of placing a riser on the outer side. Because the cylinders are transversely arranged and the gravity feeding direction of the risers is inconsistent, and the feeding range of the cylinders far exceeds the effective feeding range of the risers, the density of the casting cylinders produced by the original process method, which are close to the risers, is higher, and the density of the casting cylinders far away from the risers is lower, so that the design requirements of products are difficult to achieve. If local overheating tendency is caused by further increasing the diameter of the riser, the density of the casting is also reduced, and therefore, how to improve the density of the internal structure of the cylinder without overheating tendency is the key technology of the invention.
Disclosure of Invention
In view of the above, the present invention is directed to overcoming the drawbacks of the prior art and providing a local pressurization process for casting a box.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a pressurizing device for casting a box body comprises a supporting body and a ventilation connecting pipe, wherein the supporting body is connected with a casting body, a piston is arranged on the supporting body, a piston wall is sleeved on the outer side of the piston, and one end of the piston wall is connected with the ventilation connecting pipe. The support body is transversely arranged on the outer side of the casting body and connected with the inner cavity, and the diameter of the support body is 6 times of the average wall thickness of the casting body.
Further, the piston is of a T-shaped structure, a piston cavity is arranged in the wall of the piston, and the structure of the piston cavity is matched with the piston. The T-shaped structure is used for limiting the ejection distance of the piston, and the piston transmits pressure to the supporting body through the heat insulation pad under the action of gas. The piston cavity is used for installing the piston and is of a T-shaped structure and used for limiting the ejection distance of the piston.
Furthermore, a heat insulation pad is arranged on the support body and is tightly attached to the piston. The heat insulation pad is made of a refractory heat insulation material and has the function of blocking the piston from chilling the support body to ensure the normal propulsion of the piston, the thickness of the heat insulation pad is more than 10mm, and the shape of the heat insulation pad is consistent with the shape of the cross section of the support body.
Furthermore, one end of the piston wall is in threaded connection with the ventilation connecting pipe, and the inner diameter of the other end of the piston wall is larger than or equal to the outer diameter of the heat preservation pad. The vent connecting pipe is used for connecting the piston cavity.
Further, the outer diameter of the heat preservation pad is equal to the diameter of the support body.
Furthermore, a ventilation switch is arranged on the ventilation connecting pipe. The ventilation switch is used for switching on and off a valve of compressed air.
Furthermore, the pressurizing device also comprises a temperature measuring element which is positioned on one side of the supporting body; the temperature measuring element is a thermocouple. The temperature measuring element is used for measuring the temperature of the surrounding part of the support body.
A partial pressurization process using the pressurization device of item, comprising the steps of:
(1) determining the volume of a thick and large part of the casting body;
(2) determining the margin of the support body end face increase according to the volume needing to be fed;
(3) determining a stroke distance of the piston according to the increased margin;
(4) determining the pressurization pressure according to the extrusion distance;
(5) and (3) installing a pressurizing device at the thick part of the casting body, then pouring, and when the temperature displayed by the temperature measuring element reaches the solidification temperature, opening a ventilation switch, and compressing the support body by the piston.
Further, the margin of the increase in the step (2) is 15-30%; preferably, the margin of increase is 20%.
Further, the temperature measuring element in the step (5) is a thermocouple; the temperature detected by the temperature measuring element is required to be 15-20 ℃ lower than the solidification temperature.
The solidification temperature is less than or equal to 557 ℃.
The process arranges the pressurizing device outside the support body with the large thickness of the casting body, after the casting body is poured, the compressed air is utilized to generate thrust to the piston, the piston acts on the supporting body and continuously generates the thrust, the volume of the supporting body is reduced after the supporting body is extruded, the density is increased, in order to accurately determine the time for starting pressurization, a thermocouple is arranged at the average wall thickness position of the adjacent support body positions and is used for detecting the temperature of the casting body which is poured to the average wall thickness position and reaches solidification, when the average wall thickness reaches a solidification state, the cylinder part is still in a melting state, the ventilation switch of the pressurizing device is opened, compressed air enters the piston cavity to push the piston to move forwards to extrude the support body, since the matrix around the support is already solidified at this time, the thrust acting on the piston only compresses the support in a molten state but does not spread to the periphery.
Compared with the prior art, the invention has the following advantages:
according to the local pressurization process for casting the box body, the pressurization device is additionally arranged on the casting mould, the problem that the density of the thick and large part cannot be improved in a mode of placing a dead head and communicating an inner pouring gate due to the limitation of a product structure of a large complex aluminum alloy sand casting is solved, the pressurization feeding can be carried out on a single thick and large part, the pressurization feeding can also be carried out on a plurality of thick and large parts simultaneously, the density of the thick and large part of the casting body subjected to the pressurization feeding is greatly improved, and the performance requirements of various large and complex box body type casting bodies can be met.
The pressurizing device for casting the box body can be repeatedly recycled.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic view of the original position of a pressurizing device for casting a box according to an embodiment of the invention;
FIG. 2 is an enlarged view of a portion at A;
FIG. 3 is a schematic diagram of a pressurizing device for casting a box body according to an embodiment of the invention after pouring;
fig. 4 is a partial enlarged view at B.
Description of reference numerals:
1. a casting body; 2. a support body; 3. a heat-insulating pad; 4. a piston; 5. a piston wall; 6. a ventilation connecting pipe; 7. a ventilation switch; 8. a temperature measuring element.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example 1
A pressurizing device for casting a box body comprises a supporting body and a ventilation connecting pipe, wherein the supporting body is connected with a casting body, a piston is arranged on the supporting body, a piston wall is sleeved on the outer side of the piston, and one end of the piston wall is connected with the ventilation connecting pipe. The support body is transversely arranged on the outer side of the casting body and connected with the inner cavity, and the diameter of the support body is 6 times of the average wall thickness of the casting body. The piston is of a T-shaped structure, a piston cavity is arranged in the wall of the piston, and the structure of the piston cavity is matched with the piston. The supporting body is provided with a heat insulation pad, and the piston is positioned on the heat insulation pad. The thickness of the heat preservation pad is 10-15mm, and the shape is consistent with the cross section shape of the support body. One end of the piston wall is in threaded connection with the ventilation connecting pipe, and the inner diameter of the other end of the piston wall is larger than or equal to the outer diameter of the heat insulation pad. The vent connecting pipe is used for connecting the piston cavity. The ventilation connecting pipe is provided with a ventilation switch. The pressurizing device also comprises a thermocouple, and the thermocouple is positioned on one side of the supporting body.
A partial pressurization process using the pressurization device, comprising the steps of:
(1) determining the diameter (phi 60mm) and the length (120mm) of a transverse partition plate of the machine body casting, and calculating the volume of a thick part;
(2) determining the margin of 30mm increased by the end face of the support body according to the volume to be fed, wherein the thickness of the support body is subject to the requirement that the density of the support body can be met after the piston extrudes the support body;
(3) determining the stroke distance of the piston to be 28mm according to the increased margin of 30mm, wherein the limiting sizes of the piston and the piston cavity are matched with the increased thickness of the end face of the support body;
(4) determining the extrusion pressure to be 0.5MPa according to the extrusion distance;
(5) the core making and core assembling process by adopting conventional resin sand comprises the following steps: before core making, firstly, a piston is arranged in a piston cavity, the front end faces of the piston and the piston cavity are flush, a heat insulation pad is placed at the end face of a support body, then the piston cavity is placed on the heat insulation pad, the piston is tightly attached to the heat insulation pad, meanwhile, a thermocouple is placed at the position of the set average wall thickness around the support body, core making is started, the piston cavity and a mold core are connected into a whole after resin sand is solidified, a ventilation connecting pipe is connected to a top cover of the piston cavity after the mold core is combined, the thermocouple is connected to a temperature measuring instrument, a ventilation switch is in a closed state, and the piston state is as shown in a figure 1-2;
(6) the casting is carried out and the state of the piston after the casting is finished is shown in figures 3-4. After pouring is finished, the temperature measuring instrument begins to record temperature changes of the casting body in different time periods, when the temperature displayed by the thermocouple is lower than the solidification temperature by 15-20 ℃, the temperature around the supporting body is shown to reach a solidification state, the supporting body is still in a melting state at the moment, the ventilation switch is turned on, the piston is pushed forward under the action of air pressure, the heat preservation cushion is driven to move forward together and is gradually pushed into the supporting body, the volume of the supporting body is gradually reduced under the action of continuous thrust of the piston, the density is continuously improved, and the extrusion process is finished when the piston is pushed to a limited position. The density of the structure of the part of the casting after extrusion is improved, and the tensile strength of the part is improved from 300-330MPa to 350-380MPa through anatomical detection.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a pressure device for box casting which characterized in that: the casting device comprises a supporting body and a ventilation connecting pipe, wherein the supporting body is connected with a casting body, a piston is arranged on the supporting body, a piston wall is sleeved on the outer side of the piston, and one end of the piston wall is connected with the ventilation connecting pipe.
2. The pressurizing device for casting the box body as claimed in claim 1, wherein: the piston is of a T-shaped structure, a piston cavity is arranged in the wall of the piston, and the structure of the piston cavity is matched with the piston.
3. The pressurizing device for casting the box body as claimed in claim 1, wherein: the supporting body is provided with a heat insulation pad, and the heat insulation pad is tightly attached to the piston.
4. The pressurizing device for casting the box body as claimed in claim 3, wherein: one end of the piston wall is in threaded connection with the ventilation connecting pipe, and the inner diameter of the other end of the piston wall is larger than or equal to the outer diameter of the heat insulation pad.
5. The pressurizing device for casting the box body as claimed in claim 4, wherein: the outer diameter of the heat preservation pad is equal to the diameter of the support body.
6. The pressurizing device for casting the box body as claimed in claim 1, wherein: the ventilation connecting pipe is provided with a ventilation switch.
7. The pressurizing device for casting the box body as claimed in claim 1, wherein: the pressurizing device also comprises a temperature measuring element which is positioned on one side of the supporting body; the temperature measuring element is a thermocouple.
8. A local pressurization process using the pressurization device according to any one of claims 1 to 7, characterized in that: the method comprises the following steps:
(1) determining the volume of a thick and large part of the casting body;
(2) determining the margin of the support body end face increase according to the volume needing to be fed;
(3) determining a stroke distance of the piston according to the increased margin;
(4) determining the pressurization pressure according to the extrusion distance;
(5) and (3) installing a pressurizing device at the thick part of the casting body, then pouring, and when the temperature displayed by the temperature measuring element reaches the solidification temperature, opening a ventilation switch, and compressing the support body by the piston.
9. The localized pressurization process for casting boxes according to claim 8, characterized in that: the margin of the increase in the step (2) is 15-30%; preferably, the margin of increase is 20%.
10. The localized pressurization process for casting boxes according to claim 8, characterized in that: the temperature measuring element in the step (5) is a thermocouple; the temperature detected by the temperature measuring element is required to be 15-20 ℃ lower than the solidification temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111419860.5A CN114042867A (en) | 2021-11-26 | 2021-11-26 | Local pressurizing process for casting box body |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111419860.5A CN114042867A (en) | 2021-11-26 | 2021-11-26 | Local pressurizing process for casting box body |
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| CN114042867A true CN114042867A (en) | 2022-02-15 |
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| CN202111419860.5A Pending CN114042867A (en) | 2021-11-26 | 2021-11-26 | Local pressurizing process for casting box body |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005088033A (en) * | 2003-09-16 | 2005-04-07 | Nippon Light Metal Co Ltd | Manufacturing method of piston for internal-combustion engine |
| CN101134235A (en) * | 2006-08-31 | 2008-03-05 | 三菱重工业株式会社 | Method and apparatus for manufacturing aluminum die-cast product |
| CN206663723U (en) * | 2017-04-15 | 2017-11-24 | 鸿泰精密模具（昆山）有限公司 | A kind of injection mould local pressurizing device |
| CN109570471A (en) * | 2017-09-28 | 2019-04-05 | 郭天龙 | A kind of more gate pressure casting dies of variable diameter runner |
| CN208712835U (en) * | 2018-08-17 | 2019-04-09 | 龙口市大川活塞有限公司 | A kind of negative pressure feeding structure |
| CN208743658U (en) * | 2018-08-31 | 2019-04-16 | 喀左志远铸业有限公司 | A kind of low-pressure die casting plant cooling device |
| CN209077751U (en) * | 2018-10-19 | 2019-07-09 | 华中科技大学 | A kind of die casting of excess enthalpy offset-type pressurized |
| CN112548079A (en) * | 2020-08-18 | 2021-03-26 | 东风汽车有限公司 | Aluminum alloy support local extrusion method and device based on gravity casting |
| CN113635002A (en) * | 2021-09-13 | 2021-11-12 | 山西柴油机工业有限责任公司 | Processing method for solving generation of local high-hardness cracks on small end face of metal part |
-
2021
- 2021-11-26 CN CN202111419860.5A patent/CN114042867A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005088033A (en) * | 2003-09-16 | 2005-04-07 | Nippon Light Metal Co Ltd | Manufacturing method of piston for internal-combustion engine |
| CN101134235A (en) * | 2006-08-31 | 2008-03-05 | 三菱重工业株式会社 | Method and apparatus for manufacturing aluminum die-cast product |
| CN206663723U (en) * | 2017-04-15 | 2017-11-24 | 鸿泰精密模具（昆山）有限公司 | A kind of injection mould local pressurizing device |
| CN109570471A (en) * | 2017-09-28 | 2019-04-05 | 郭天龙 | A kind of more gate pressure casting dies of variable diameter runner |
| CN208712835U (en) * | 2018-08-17 | 2019-04-09 | 龙口市大川活塞有限公司 | A kind of negative pressure feeding structure |
| CN208743658U (en) * | 2018-08-31 | 2019-04-16 | 喀左志远铸业有限公司 | A kind of low-pressure die casting plant cooling device |
| CN209077751U (en) * | 2018-10-19 | 2019-07-09 | 华中科技大学 | A kind of die casting of excess enthalpy offset-type pressurized |
| CN112548079A (en) * | 2020-08-18 | 2021-03-26 | 东风汽车有限公司 | Aluminum alloy support local extrusion method and device based on gravity casting |
| CN113635002A (en) * | 2021-09-13 | 2021-11-12 | 山西柴油机工业有限责任公司 | Processing method for solving generation of local high-hardness cracks on small end face of metal part |
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Effective date of registration: 20221028 Address after: 037036 No. 97, Daqing West Road, Yungang District, Datong City, Shanxi Province Applicant after: SHANXI DIESEL ENGINE INDUSTRY Co.,Ltd. Applicant after: Shanxi Zhongbing Foundry Co.,Ltd. Address before: 037036 No. 97, Daqing West Road, Yungang District, Datong City, Shanxi Province Applicant before: SHANXI DIESEL ENGINE INDUSTRY Co.,Ltd. |
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