CN119282032A - A V-type cylinder low-pressure core assembly double-lift liquid pipe casting weight compensation process and system - Google Patents
A V-type cylinder low-pressure core assembly double-lift liquid pipe casting weight compensation process and system Download PDFInfo
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- CN119282032A CN119282032A CN202411275161.1A CN202411275161A CN119282032A CN 119282032 A CN119282032 A CN 119282032A CN 202411275161 A CN202411275161 A CN 202411275161A CN 119282032 A CN119282032 A CN 119282032A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/082—Sprues, pouring cups
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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
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
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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)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Abstract
本发明涉及一种V型缸体低压组芯双升液管浇注重力补缩工艺及系统；系统包括浇注冒口、内浇口、浇口、双升液管、推插板机构；浇口分为左浇口、右浇口；双升液管是左侧浇注升液管和右侧浇注升液管；双升液管中上升的铝液会在V型缸体的砂包型腔内汇集；内浇口位于双升液管顶部与浇注冒口连接处；进行浇注时，左、右侧浇注升液管同时进行浇注；推插板机构由固定气缸、插板组成；浇注结束后，固定气缸推插板到位，封死内浇口；机器人翻转带有铝液的砂包，重力补缩凝固；本发明可减少铝水充型过程中的温度损失，杜绝冷气隔的形成，同时保证缸体曲轴箱瓦座位置的机械性能符合技术要求。
The invention relates to a V-type cylinder low-pressure core assembly double riser pouring gravity compensation process and system; the system comprises a pouring riser, an inner gate, a gate, a double riser pipe and a push-and-plug plate mechanism; the gate is divided into a left gate and a right gate; the double riser pipe is a left pouring riser pipe and a right pouring riser pipe; the aluminum liquid rising in the double riser pipe will be collected in a sand bag cavity of the V-type cylinder; the inner gate is located at the connection between the top of the double riser pipe and the pouring riser; when pouring, the left and right pouring riser pipes are poured at the same time; the push-and-plug plate mechanism consists of a fixed cylinder and a plug plate; after the pouring is completed, the fixed cylinder pushes the plug plate into place to seal the inner gate; a robot turns over the sand bag with aluminum liquid, and solidifies it by gravity compensation; the invention can reduce the temperature loss in the process of aluminum liquid filling, prevent the formation of cold air barrier, and ensure that the mechanical properties of the cylinder crankcase shoe seat position meet the technical requirements.
Description
Technical Field
The invention relates to the field of development and production of V-shaped engine cylinders, in particular to a gravity feeding process and a gravity feeding system for casting a low-pressure core-assembly double-lift-tube of a V-shaped cylinder.
Background
The invention relates to the field of development and production of V-shaped casting sleeve cylinder bodies of automobile aluminum alloy, and the production process is sand mold core assembly low-pressure pouring gravity feeding, and is mainly applied to production of V-shaped casting sleeve cylinder bodies of low-pressure sand mold aluminum alloy. The length of the V-shaped cylinder body is between 380mm and 700mm, the prior art adopts one-end single-lift liquid pipe for casting at present, aluminum water temperature field is unevenly distributed after casting is finished, the problems of local hot joint and cold insulation of the cylinder body can be caused, the service life and stability of an engine are greatly influenced, and the problems of oil leakage and cooling liquid leakage can be seriously caused. Currently, in the published patent literature, there is substantially no casting technology for V-type aluminum alloy sleeve cylinders. With the development and manufacture of high-performance and high-power V-shaped engine cylinder bodies with complex inner cavities, the quality of the cylinder bodies directly influences the performance of the engine.
The first casting technology adopted for the low-pressure sand mould V-shaped aluminum alloy casting sleeve cylinder body is bottom casting, aluminum water enters from a tile seat and the bottom surface, so that the tile seat is overheated, formed grains are thick and cannot meet the mechanical property of the engine cylinder body, the second casting technology adopts left and right top surface aluminum entering, a pouring gate is positioned at the front end surface position and the rear end surface position, aluminum water enters from the end surface of the cylinder body with larger length size, aluminum water in a cavity is inconsistent in temperature, aluminum water flows in the cavity, temperature loss is caused, the temperature of the aluminum water is low at the position far from the pouring gate, a cold air partition is formed, leakage cannot occur at the normal temperature, and leakage can occur at the cold air partition position under the hot state.
The technical background of the invention is that the technical requirement of a novel large-size inner cavity complex V-shaped aluminum alloy cylinder body is water jacket pressure test, namely, under the air pressure of 300kPa, the leakage amount is not more than 8cm/min, and the main oil duct pressure test of the cylinder body is that under the air pressure of 400kPa, the leakage amount is not more than 10cm/min, and meanwhile, the casting is required to be not allowed to have the defect forms of pores, shrinkage porosity, cold insulation, insufficient casting and the like.
Patent document 1 (CN 101298091 a) discloses a low-pressure core-set casting process for an engine V6 aluminum cylinder, which is used for casting an automobile engine V6 aluminum cylinder. The casting process comprises the steps of carrying out three-dimensional modeling on a product, determining a crankcase downwards according to the shape of a casting of an engine V6 aluminum cylinder body, pouring aluminum liquid from a crankcase baffle, selecting a gate position and determining a gate size, carrying out casting simulation by casting simulation software, analyzing possible defects of the casting, and then preparing a process design scheme according to analysis results, wherein the casting process comprises the steps of 1) core making, 2) combining sand cores into a sand core group, and 3) carrying out low-pressure casting. According to the invention, the flexible core assembly mode can be adopted according to different engine cylinder shapes to produce the aluminum cylinder casting with thin wall, complexity and excellent quality, and the aluminum cylinder casting is suitable for mass production of an automatic production line, so the aluminum cylinder casting has the characteristics of low cost, high efficiency and high qualification rate.
In patent document 2 (CN 102091772 a), a low-pressure casting method for a large casting is disclosed, in which two or more crucible melting and holding furnaces are used, each furnace is provided with a lift pipe, and the distance between the melting and holding furnaces is adjusted according to the sprue position of the mold. During low-pressure casting, the casting mould is hung on a low-pressure casting furnace, a low-pressure casting control device is started, and molten aluminum enters the casting mould according to the speed and pressure required by the process and is maintained in pressure, so that casting is completed.
The patent document 3 (CN 102091772A) relates to a high-efficiency aluminum alloy investment casting production method, which is characterized by comprising the following steps of (1) placing an aluminum ingot into a melting furnace, electrifying and melting the aluminum ingot, wherein the melting temperature is 730+/-20 ℃, the melting time is 4-5 hours, (2) adopting a rotary degassing machine to carry out degassing operation, introducing argon with the purity of 99 percent to remove gas and slag, 3) moving the melting furnace to the lower part of a double-lift-tube low-pressure liquid lift machine, putting two lift-tubes into aluminum liquid in the melting furnace, taking 2 strings of preheated mold shells to be placed on the double-lift-tube low-pressure casting machine, compacting and casting the gate and the lift-tube of the 2 strings of mold shells, automatically releasing pressure after casting, replacing the non-cast mold shells, carrying out pressure compensation on the melting furnace due to the reduction of the liquid level in the melting furnace after casting, and (4) using a sheller to unshelling the cast mold shells to obtain a casting blank with the gate, and removing the gate to obtain a complete casting. The casting efficiency can be improved, and the quality of castings can be guaranteed to be high-quality and reliable.
The above patent documents have low relevance to the present application.
Disclosure of Invention
The application aims to design a double-lift-tube casting process, aluminum is fed simultaneously at the left side and the right side, the temperature of aluminum water in a sand bag is ensured to be uniform, sequential solidification is realized, and a high-quality V-shaped aluminum alloy cylinder body is produced, so that the method has a certain guiding significance for developing and producing a low-pressure sand mould V-shaped aluminum alloy casting sleeve cylinder body.
The process can effectively solve the problem of an aluminum liquid temperature field in the sand core, improves the product quality of the V-shaped cylinder body, and provides a gravity feeding process and a gravity feeding system for casting the V-shaped aluminum alloy cylinder body by using the low-pressure core assembly double liquid lifting pipes.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
In order to solve the technical problems, the invention is realized by adopting the following technical scheme:
a gravity feeding system for casting a double lift tube with a low-pressure core assembly of a V-shaped cylinder body comprises a casting riser 2, an inner gate 9, a gate, a double lift tube and a push-plug plate mechanism;
The gate is divided into a left gate 1-1 and a right gate 1-2;
The double lift tube is two lift tubes, namely a left pouring lift tube 6-1 and a right pouring lift tube 6-2, and rising aluminum liquid of the double lift tube can be collected in a sand bag cavity of the V-shaped cylinder body;
the inner gate 9 is positioned at the joint of the top of the double riser tube and the casting riser;
The plug board pushing mechanism consists of a fixed air cylinder and a plug board, and after casting is finished, the fixed air cylinder pushes the plug board in place to seal the in-gate.
Further, the positions of the left pouring lift tube 6-1 and the right pouring lift tube 6-2 are determined according to the dimension between the left and right top surfaces of the V-shaped cylinder.
Further, the inner gate is of a cylindrical structure, after low-pressure pouring is finished, the fixed air cylinder pushes the inserting plate, the space of the inserting plate is reserved at the position of the sand core, the inserting plate is pushed into the reserved space to plug the inner gate of the cylinder, and the overflow of aluminum liquid in the cavity is prevented.
Further, the central line of the plugboard axially coincides with the cylinder;
further, two sets of pushing and inserting plate mechanisms are arranged.
A gravity feeding process for casting a V-shaped cylinder body with a low-pressure core assembly and double liquid lifting pipes comprises the following steps:
step one, combining the manufactured V-shaped cylinder sand cores;
Step two, pouring, namely pouring the liquid lifting pipes on the left side and the right side simultaneously;
Thirdly, after casting is finished, the fixed cylinder 7 pushes the plugboard 8 in place, and the inner gate is sealed;
And step four, turning over the sand bag to solidify.
In the sand bag combination state in the first step, the bottom plate core, the front end core, the rear end core, the left side core, the right side core, the left pipe barrel core, the right pipe barrel core, the large cover inner core and the top cover core are combined to form the V-shaped cylinder sand bag.
Further, in the second step, the sand ladle is clamped by a robot, the sand ladle is turned over for casting by 180 degrees, the liquid lifting pipes are cast on the left side and the right side simultaneously, aluminum is fed on the left side and the right side simultaneously, the temperature of the aluminum water in the sand ladle is ensured to be uniform, and sequential solidification is realized.
And step three, after the pouring is finished, fixing the cylinder pushing plug board in place to seal the in-gate, and adopting a double plug board design and a double cylinder design to seal the in-gate.
Further, in the fourth step, the robot turns over the sand bag at 180 ℃ and performs gravity feeding solidification.
Compared with the prior art, the invention has the beneficial effects that:
the invention can reduce the temperature loss in the aluminum water filling process, stop the formation of cold air barriers, and ensure that the mechanical properties of the cylinder crankcase tile seat meet the technical requirements.
Drawings
The invention is further described below with reference to the accompanying drawings:
FIG. 1 is an anatomic diagram of a low pressure core-set dual lift tube casting process system;
FIG. 2 is a front view overall of a low pressure core assembly dual lift tube casting process system;
FIG. 3 is a side overall view of a low pressure core assembly dual riser casting process system;
FIG. 4 is a schematic view of the sand pack after core assembly is completed;
FIG. 5 is a schematic diagram of a gravity feeding system for casting a double lift tube with a low-pressure core assembly of a V-shaped cylinder body;
FIG. 6 is a schematic view of a gate, casting riser, and header gate structure;
In the figure:
1-1, a left pouring gate;
1-2, right pouring gate;
2, casting a riser;
3, core assembly sand bags;
4, a crucible;
5, a furnace cover;
6-1, pouring a lift tube on the left side;
6-2, pouring a lift tube on the right side;
7, fixing a cylinder;
8, inserting plates;
And 9, inner pouring gate.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention become more apparent, the technical solutions in the embodiments of the present invention will be described in more detail below with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The described embodiments are some, but not all, embodiments of the invention. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention. Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
In the description of the present invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, merely to facilitate describing the present invention and simplify the description, and do not indicate or imply that the devices or elements being referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the scope of the present invention.
The invention is described in detail below with reference to the attached drawing figures:
The invention provides an embodiment of a gravity feeding system for low-pressure core assembly and double liquid lifting pipes of a V-shaped cylinder body, which comprises a riser, an inner gate and a gate, wherein each structure in fig. 1 realizes the low-pressure casting process and the inner gate plugging, and then a sand bag and a casting are turned for 180 degrees to realize gravity feeding.
The gravity feeding system for low-pressure pouring of the double lift tubes of the V-shaped cylinder body adopts a double-plugboard mechanism to plug an in-gate technology, the double-plugboard mechanism is shown in figure 1 and consists of a fixed cylinder and a plugboard, the double-plugboard design and the double-cylinder design are adopted, the parts realize the plugging of aluminum liquid after pouring of the double lift tubes, and the necessary condition for realizing gravity feeding by turning 180 degrees is realized. The double-plugboard mechanism plug in-gate technology is that a fixed cylinder pushes a plugboard to be in place to seal in-gate, the in-gate is of a cylindrical structure, after low-pressure casting is finished, the fixed cylinder pushes the plugboard, a plugboard space is reserved at the sand core position, the plugboard can be pushed into the reserved space to plug in-gate of the cylinder, and the overflow of aluminum liquid in a cavity is prevented.
The invention provides a low-pressure pouring gravity feeding system of a low-pressure sand mould V-shaped aluminum alloy casting sleeve cylinder body, which takes a V8TD cylinder body as an example, and is shown in figures 1, 2 and 3;
FIG. 1 is a schematic view in schematic section showing a state of a low pressure casting process, showing a double lift tube and push-insert plate mechanism, FIG. 2 is an exterior state elevation view of the low pressure casting process, FIG. 3 is an exterior state side view of the low pressure casting process;
The casting process principle is as follows:
The manufactured V-shaped cylinder sand cores are combined to form the state shown in fig. 4. And in the sand bag combination state, combining the bottom plate core, the front end core, the rear end core, the left side core, the right side core, the left pipe barrel core, the large cover inner core and the top cover core to form the V-shaped cylinder sand bag. The sand ladle is clamped by a robot, the sand ladle is turned over by 180 degrees to perform casting, the double lift pipes are two lift pipes, the left side casting lift pipe 6-1 and the right side casting lift pipe 6-2 are respectively arranged, the positions of the left side casting lift pipe 6-1 and the right side casting lift pipe 6-2 are determined according to the size between the left top surface and the right top surface of the V-shaped cylinder body, the two lift pipes are not connected, and rising aluminum liquid of the lift pipes can be collected in the sand ladle cavity of the V-shaped cylinder body. After the casting is finished, the cylinder is fixed, the plug board is pushed into place to seal the in-gate 9, the center line of the plug board axially coincides with the cylinder, and the in-gate 9 is positioned at the joint of the top of the riser tube and the riser, as shown in the positions of schematic diagrams 5 and 6. The robot turns the sand pack over 180 ℃ to solidify.
The invention provides an embodiment of a gravity feeding process for casting a V-shaped cylinder body by using a low-pressure core-assembling double-lift-tube casting system, wherein the casting of the V-shaped cylinder body is realized by using a double-lift-tube casting system of the V-shaped cylinder body, aluminum is fed at the left side and the right side simultaneously, the temperature uniformity of aluminum water in a sand bag is ensured, sequential solidification is realized, the aluminum liquid is prevented from overflowing a cavity after an inner pouring gate is plugged by a double-plug-plate mechanism, and then the sand bag filled with the aluminum liquid is turned over for gravity feeding.
The process flow comprises the steps of sand ladle combination completion, double liquid lifting pipe low-pressure pouring, pushing the plugboard to plug the in-gate aluminum liquid by the air cylinder, and overturning the sand ladle with the aluminum liquid by a robot to perform 180-gravity feeding solidification.
The foregoing is merely illustrative of specific embodiments of the present invention, and the scope of the invention is not limited thereto, but any modifications, equivalents, improvements and alternatives falling within the spirit and principles of the present invention will be apparent to those skilled in the art within the scope of the present invention. And all that is not described in detail in this specification is well known to those skilled in the art.
Claims (10)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411275161.1A CN119282032B (en) | 2024-09-12 | 2024-09-12 | A pressure feeding process and system for casting a V-shaped cylinder low-pressure core with a double-riser liquid pipe. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202411275161.1A CN119282032B (en) | 2024-09-12 | 2024-09-12 | A pressure feeding process and system for casting a V-shaped cylinder low-pressure core with a double-riser liquid pipe. |
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| Publication Number | Publication Date |
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| CN119282032A true CN119282032A (en) | 2025-01-10 |
| CN119282032B CN119282032B (en) | 2025-11-14 |
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| CN202411275161.1A Active CN119282032B (en) | 2024-09-12 | 2024-09-12 | A pressure feeding process and system for casting a V-shaped cylinder low-pressure core with a double-riser liquid pipe. |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107138680A (en) * | 2017-06-13 | 2017-09-08 | 鹰普航空零部件（无锡）有限公司 | Efficient aluminium alloy fusible pattern low pressure casting production method |
| CN211803763U (en) * | 2020-02-02 | 2020-10-30 | 温州瑞明工业股份有限公司 | Low-pressure filling type gravity compensation casting mould |
| CN113618047A (en) * | 2021-08-04 | 2021-11-09 | 苏州明志科技股份有限公司 | A low-pressure filling type gravity feeding device and process method |
| CN215902707U (en) * | 2021-08-04 | 2022-02-25 | 苏州明志科技股份有限公司 | Low-pressure filling type gravity feeding device |
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- 2024-09-12 CN CN202411275161.1A patent/CN119282032B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107138680A (en) * | 2017-06-13 | 2017-09-08 | 鹰普航空零部件（无锡）有限公司 | Efficient aluminium alloy fusible pattern low pressure casting production method |
| CN211803763U (en) * | 2020-02-02 | 2020-10-30 | 温州瑞明工业股份有限公司 | Low-pressure filling type gravity compensation casting mould |
| CN113618047A (en) * | 2021-08-04 | 2021-11-09 | 苏州明志科技股份有限公司 | A low-pressure filling type gravity feeding device and process method |
| CN215902707U (en) * | 2021-08-04 | 2022-02-25 | 苏州明志科技股份有限公司 | Low-pressure filling type gravity feeding device |
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| CN119282032B (en) | 2025-11-14 |
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