A rapid casting method for a large marine engine distributor and a sand core assembly
By setting up multiple inner gates and core-assembly devices in the sand core group of large marine engine distribution bodies, the problems of complex casting process and difficulty in positioning the sand core are solved, high-quality and efficient production of castings are achieved, and production costs are reduced .
Patent Information
- Application Number
- CN201911169599.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2019-11-26
- Publication Date
- 2024-12-27
- Estimated Expiration
- 2039-11-26
AI Technical Summary
The casting process of large marine engine distribution bodies is complicated, which leads to difficulty in positioning and assembly of sand cores, and is prone to problems such as poor dimensional accuracy, poor sealing, high scrap rate and high production costs.
A casting runner is set on one side of the sand core group, and a vertical inner gate and a transverse inner gate are set to align the partition mold cavity in the sand core group cavity. The iron flows into the casting runner and passes through the vertical inner gate. , , the horizontal inner gate is filled, and the molten iron is filled through the distribution of multiple inner gates, and the precise positioning and firm fixation of the sand core is achieved by combining the core-combining device.
It effectively ensures casting uniformity and casting quality, improves casting speed and structural rigidity, and reduces waste rate and production costs.
Smart Images
Figure CN110976778B_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of engine component installation, and more specifically, to a rapid casting method for a distributor of a large marine engine and a sand core assembly. Background Art
[0002] The engine thermostat assembly is a key component of the entire diesel engine. Its main function is to ensure that the heat generated by the engine during operation can be dissipated in time, meet the temperature control requirements of the engine, and ensure that the engine operates at the most suitable temperature state, so as to exert the best performance of the engine. The engine distributor is an important component of the thermostat assembly. Its main function is to distribute the direction of the fluid, thereby ensuring the cooling and lubrication of the engine during normal operation.
[0003] In large marine engines, water cooling is generally used for engine cooling, and oil lubrication is used for lubrication, so the fluids distributed by the distributor of large marine engines are mainly cooling water and oil. Because of the need to distribute fluids, there are often many water channels and oil channels irregularly distributed on the distributor. These water channels and oil channels are not only huge in number, but also independent of each other. The particularity of this function and structure leads to the complex structure distribution of the water channels and oil channel interlayers. Therefore, the internal structure of the distributor is generally more complicated.
[0004] The distributor is generally formed by casting. Due to the existence of the criss-cross oil-water channel interlayer, it is difficult to ensure smooth filling of the molten iron during pouring, the oil-water channel interlayer is prone to incomplete filling, and the casting is prone to casting defects such as wall penetration, shrinkage, and cold shut. In addition, due to the existence of independent water channels and oil channels, the casting process of the distributor is often complicated, the positioning and assembly of the sand core is very difficult, and the casting difficulty is very high. If the sand core is not positioned accurately or fixed unstably, the sand core is easy to shift or tilt, resulting in poor dimensional accuracy of the casting, causing the wall thickness of the oil-water channel interlayer of the casting to become thinner or penetrate the wall, resulting in poor sealing of the oil-water channel interlayer of the casting, high casting scrap rate, high production cost and other problems. This seriously restricts the development and production of engine distributors, thereby affecting the development of the entire engine industry.
[0005] According to the existing distribution body casting process and forming method, although the development and production of the distribution body can be completed, this casting process method still has obvious disadvantages, which are mainly manifested in:
[0006] (1) Due to the existence of the criss-cross oil-water channel interlayer, it is difficult to ensure smooth filling of the molten iron during pouring, and the oil-water channel interlayer is prone to incomplete filling, and the casting is prone to casting defects such as wall penetration, shrinkage, and cold shut;
[0007] (2) Due to the limitations of the independent water flow channel and oil channel structure, there are few installation points for a single sand core, and the positioning of a single sand core is inaccurate, difficult to fix, and unstable;
[0008] (3) Due to the limitation of the structure of water flow channel and oil channel, the number of sand cores in the casting process of the distributor is often large. The more sand cores there are, the more difficult it is to assemble the core. The water flow channel and oil channel of the distributor are independent of each other, and the position where the core head can be arranged is very limited. When assembling the core, it is easy to encounter problems such as difficulty in assembling the core and poor core assembly accuracy;
[0009] (4) The applicability of the existing casting process and forming method is limited to the distribution body castings with ordinary structures. For some sand cores with special structures, some sand cores cannot be assembled at all according to the traditional core assembly method. Even if they can be assembled, the core assembly efficiency is very low.
[0010] (5) The casting has poor dimensional accuracy, high scrap rate and high casting cost. Summary of the invention
[0011] The technical problem to be solved by the present invention is to address the above-mentioned deficiencies in the prior art. One of the purposes of the present invention is to provide a method for quickly casting a distributor of a large marine engine which ensures uniform casting and casting quality.
[0012] A second object of the present invention is to provide a sand core assembly for rapid casting of a distributor of a large marine engine.
[0013] To achieve the above-mentioned purpose one, the present invention provides a method for rapid casting of a large marine engine distributor body, the casting method comprising: setting a pouring runner on one side of a sand core group, setting a vertical ingate on the pouring runner to align with the vertical interlayer mold cavity in the sand core group cavity and setting a horizontal ingate to align with the horizontal interlayer mold cavity in the sand core group cavity, molten iron flows into the pouring runner and fills the cavity of the sand core group through the vertical ingate and the horizontal ingate to obtain a distributor body.
[0014] Furthermore, the casting method also includes: setting a vertical runner at the bottom end of the pouring cup of the pouring runner, setting a first horizontal runner at the bottom end of the vertical runner, setting a second horizontal runner above both ends of the first horizontal runner, and setting a vertically extending vertical inner gate and a horizontally extending horizontal inner gate on the inner side of the second horizontal runner.
[0015] Furthermore, a filter screen is provided between the vertical runner and the first transverse runner, and a slag collecting bag extending upward is provided on the second transverse runner.
[0016] Furthermore, the sand core group includes an upper sand core group and a lower sand core group, and the pouring runner is arranged in the upper sand core group and the lower sand core group; and a plurality of sand cores are arranged in the mold cavity in the upper sand core group and the lower sand core group.
[0017] Furthermore, the lower sand core group includes a lower outer mold, a first sand core, a second sand core, a third sand core, a fourth sand core, a fifth sand core and a sixth sand core; the upper sand core group includes an upper outer mold, an eighth sand core and a ninth sand core.
[0018] To achieve the second objective mentioned above, a sand core assembly for realizing a rapid casting method of a distributor of a large marine engine is provided, comprising an upper sand core group and a lower sand core group, wherein the upper sand core group and the lower sand core group are provided with pouring channels, and the cavities in the upper sand core group and the lower sand core group are provided with multiple sand cores; the pouring channels are provided with a vertical ingate aligned with the vertical interlayer cavity in the cavity of the sand core group and a horizontal ingate aligned with the horizontal interlayer cavity in the cavity of the sand core group.
[0019] Furthermore, a vertical runner is provided at the bottom of the pouring cup of the pouring runner, a first horizontal runner is provided at the bottom of the vertical runner, a second horizontal runner is provided above both ends of the first horizontal runner, and the vertical ingate and the horizontal ingate are provided on the inner side of the second horizontal runner.
[0020] Furthermore, the lower sand core group includes a lower outer mold, a first sand core, a second sand core, a third sand core, a fourth sand core, a fifth sand core and a sixth sand core; the upper sand core group includes an upper outer mold, an eighth sand core and a ninth sand core.
[0021] Furthermore, the first sand core is arranged on a side away from the pouring channel, and a core assembly device connected to the lower outer mold is provided on the first sand core; the sixth sand core is inserted at one end of the lower outer mold, and the fifth sand core is arranged at one end of the lower outer mold, and the end of the sixth sand core protrudes laterally and is provided with a connecting core head connected to the fifth sand core, and a conformal positioning and fastening rod is provided between the connecting core head and the fifth sand core.
[0022] Furthermore, the core assembly device includes a core assembly rod, a core assembly limiting plate, and a fastening nut.
[0023] Beneficial Effects
[0024] Compared with the prior art, the beneficial effects of the large marine engine distributor body rapid casting method and sand core assembly of the present invention are as follows: the large marine engine distributor body rapid casting method and sand core assembly, through the vertical inner gate aligned with the vertical oil-water channel interlayer of the distributor in the mold cavity, the horizontal inner gate aligned with the horizontal oil-water channel interlayer of the distributor in the mold cavity, such inner gate distribution can effectively ensure the smooth and rapid filling of molten iron, easy to ensure the full filling of the inner cavity oil-water channel interlayer, ensure the sealing of the oil-water channel interlayer, thereby ensuring the quality of the distributor casting. BRIEF DESCRIPTION OF THE DRAWINGS
[0025] Figure 1 It is a schematic diagram of the flow channel structure of the pouring flow channel in the present invention;
[0026] Figure 2 is a schematic diagram of a pouring runner and a distribution body in the present invention;
[0027] Figure 3 is a schematic diagram of the front side of the distribution body in the present invention;
[0028] Figure 4 is a schematic diagram of the rear side of the distribution body in the present invention;
[0029] Figure 5 It is a structural schematic diagram of the combination of the lower outer mold and the first sand core in the present invention;
[0030] Figure 6 It is a structural stereogram of the lower sand core group of the present invention;
[0031] Figure 7 It is a structural cross-sectional view of the lower sand core group in the present invention;
[0032] Figure 8 It is a bottom view of the structure of the first sand core in the present invention;
[0033] Fig. 9 is a top view of the structure of the first sand core in the present invention;
[0034] Fig.10 This is a schematic diagram of the structure of the sixth sand core and the connecting core head in the present invention.
[0035] Fig.11 It is a schematic structural diagram of the fifth sand core in the present invention;
[0036] Fig.12 It is a structural schematic diagram of the core assembly device in the present invention;
[0037] Fig.13 It is a structural schematic diagram of the conformable positioning and fastening rod in the present invention;
[0038] Fig.14 It is a structural schematic diagram of the upper sand core group in the present invention;
[0039] Fig.15 It is a schematic diagram of assembling the upper sand core group and the lower sand core combined mold in the present invention.
[0040] In the figure: 1, distribution body; 2, pouring runner; 201, vertical ingates; 202, horizontal ingates; 203, pouring cup; 204, vertical sprue; 205, first horizontal sprue; 206, second horizontal sprue; 207, filter screen; 208, slag collection bag; 3, lower outer mold; 4, first sand core; 401, first positioning core head; 402, second positioning core head; 403, third positioning core head; 404, connecting hole; 405, sand filling port; 5, third sand core; 6, core assembly device; 601, assembly Core rod; 602, core limit plate; 603, fastening nut; 604, gasket; 7, fourth sand core; 8, sixth sand core; 801, fourth positioning core head; 9, fifth sand core; 10, conformal positioning fastening rod; 11, second sand core; 12, upper outer shape; 13, ninth sand core; 14, eighth sand core; 15, lower sand core group; 16, upper sand core group; 17, connecting core head; 18, fifth positioning core head; 19, sixth positioning core head; 20, positioning stop; 21, positioning groove; 22, upper nail core head. DETAILED DESCRIPTION
[0041] The specific implementation modes of the present invention are described in detail below in conjunction with the accompanying drawings, but it should be understood that the protection scope of the present invention is not limited by the specific implementation modes.
[0042] The specific implementation of the present invention is as follows: Figure 1-15 As shown, a method for rapid casting of a large marine engine distributor body comprises: a pouring runner 2 is arranged on one side of a sand core group, the cavity in the sand core group is the mold cavity of the distributor body 1, a vertical ingate 201 is arranged on the pouring runner 2 to align with the vertical interlayer mold cavity in the sand core group mold cavity, and a horizontal ingate 202 is arranged to align with the horizontal interlayer mold cavity in the sand core group mold cavity, molten iron flows into the pouring runner 2 and fills the mold cavity of the sand core group through the vertical ingate 201 and the horizontal ingate 202 to obtain the distributor body 1. The vertical ingate 201 is aligned with the vertical oil-water channel interlayer of the distributor body 1, and the horizontal ingate 202 is aligned with the horizontal oil-water channel interlayer of the distributor body 1. Such an ingate distribution can effectively ensure that the molten iron is filled smoothly and quickly, and it is easy to ensure that the inner cavity oil-water channel interlayer is filled fully, and the sealing of the oil-water channel interlayer is ensured, thereby ensuring the quality of the distributor body casting.
[0043] In this embodiment, the casting method further includes: a vertical runner 204 is provided at the bottom end of the pouring cup 203 of the pouring runner 2, a first horizontal runner 205 is provided at the bottom end of the vertical runner 204, a second horizontal runner 206 is provided above both ends of the first horizontal runner 205, and a vertically extending vertical ingate 201 and a horizontally extending horizontal ingate 202 are provided on the inner side of the second horizontal runner 206. The vertical ingate 201 is located in front of the horizontal ingate 202.
[0044] A filter screen 207 is provided between the vertical runner 204 and the first horizontal runner 205, and a slag collecting bag 208 extending upward is provided on the second horizontal runner 206. The two second horizontal runners 206, the first horizontal runner 205 and the vertical runner 204 form a symmetrical structure to ensure that the molten iron flowing through the runner is uniform.
[0045] Molten iron flows from the pouring cup 203 into the vertical runner 204, flows through the filter 207, and is filtered by the filter 207. The clean molten iron flows into the first runner 205 from both sides at the same time, and then continues to flow upward through the second runner 206. The fine slag and impurities in the molten iron stop flowing in the slag collection bag 208 of the second runner 206. The molten iron first flows through the vertical ingates 201, and then flows into the mold through the horizontal ingates 202. The vertical ingates 201 are aligned with the vertical oil-water channel interlayer of the distribution body 1, and the horizontal ingates 202 are aligned with the horizontal oil-water channel interlayer of the distribution body 1. Such an ingates distribution can effectively ensure that the molten iron is filled smoothly and quickly, and it is easy to ensure that the inner cavity oil-water channel interlayer is filled with full molds, and the sealing of the oil-water channel interlayer is ensured, thereby ensuring the quality of the distribution body casting. The shell of the distribution body 1 is poured by multiple ingates, so that the casting speed of the distribution body 1 is fast, and the pouring is uniform, the structural rigidity is good, and the strength is high.
[0046] In this embodiment, the sand core group includes an upper sand core group 16 and a lower sand core group 15, and the pouring runner 2 is arranged in the upper sand core group 16 and the lower sand core group 15; a plurality of sand cores are arranged in the mold cavity in the upper sand core group 16 and the lower sand core group 15. The lower sand core group 15 includes a lower outer mold 3, a first sand core 4, a second sand core 11, a third sand core 5, a fourth sand core 7, a fifth sand core 9 and a sixth sand core 8; the upper sand core group 16 includes an upper outer mold 12, an eighth sand core 14 and a ninth sand core 13. The upper sand core group 16 and the lower sand core group 15 are assembled separately, and the efficiency of the assembly is fast, which facilitates the assembly of the upper and lower core groups.
[0047] A sand core assembly for rapid casting of a large marine engine distributor comprises an upper sand core group 16 and a lower sand core group 15. A pouring channel 2 is provided in the upper sand core group 16 and the lower sand core group 15. A plurality of sand cores are provided in the mold cavities of the upper sand core group 16 and the lower sand core group 15. The pouring channel 2 is provided with a vertical inner gate 201 aligned with the vertical interlayer mold cavity in the mold cavity of the sand core group and a horizontal inner gate 202 aligned with the horizontal interlayer mold cavity in the mold cavity of the sand core group.
[0048] A vertical runner 204 is provided at the bottom of the pouring cup 203 of the pouring runner 2, a first horizontal runner 205 is provided at the bottom of the vertical runner 204, a second horizontal runner 206 is provided above both ends of the first horizontal runner 205, and a vertical ingate 201 and a horizontal ingate 202 are provided on the inner side of the second horizontal runner 206. The horizontal ingate 202 is composed of an upper horizontal ingate and a lower horizontal ingate, the upper horizontal ingate is aligned with the horizontal interlayer cavity in the upper sand core group 16, and the lower horizontal ingate is aligned with the horizontal interlayer cavity in the lower sand core group 15.
[0049] The lower sand core group 15 includes the lower outer mold 3, the first sand core 4, the second sand core 11, the third sand core 5, the fourth sand core 7, the fifth sand core 9 and the sixth sand core 8; the upper sand core group 16 includes the upper outer mold 12, the eighth sand core 14 and the ninth sand core 13. The inner cavity of the upper outer mold 12 and the lower outer mold 3 is the outer contour cavity of the distribution body 1.
[0050] The first sand core 4 is arranged on a side away from the pouring channel 2, and a core assembly device 6 connected to the lower outer mold 3 is provided on the first sand core 4; the sixth sand core 8 is inserted at one end of the lower outer mold 3, and the fifth sand core 9 is arranged at one end of the lower outer mold 3. The end of the sixth sand core 8 protrudes laterally and is provided with a connecting core head 17 connected to the fifth sand core 9, and a conformal positioning fastening rod 10 is provided between the connecting core head 17 and the fifth sand core 9.
[0051] A fourth positioning core head 801 connected to the lower outer mold 3 is provided at the bottom of the sixth sand core 8, a fifth positioning core head 18 plugged into one end of the sixth sand core 8 is provided at the bottom of the connecting core head 17, a positioning stop 20 is provided between the connecting core head 17 and the fifth sand core 9, a positioning groove 21 is provided on the connecting core head 17 and the fifth sand core 9, and a conformal positioning fastening rod 10 is matched with the positioning groove 21. The connecting core head 17 and the fifth sand core 9 are firmly connected by the conformal positioning fastening rod 10, and the sixth sand core 8 and the fifth sand core 9 can be firmly assembled by filling sand in the positioning groove 21, thereby limiting the movement or tilt of the sixth sand core 8 and the fifth sand core 9 in all directions, thereby improving the stability and reliability of the core assembly.
[0052] The bottom of the first sand core 4 is protruding with a first positioning core head 401, a second positioning core head 402, and a third positioning core head 403 that are compatible with the positioning holes of the cavity of the lower outer mold 3. The first sand core 4 is provided with a connecting hole 404 corresponding to the first positioning core head 401, the second positioning core head 402, and the third positioning core head 403. The connecting hole 404 is compatible with the core assembly device 6, and the upper end of the connecting hole 404 is provided with a sand filling port 405. After the core assembly device 6 is installed at the corresponding positions of the first sand core 4 and the lower outer mold 3, the precise positioning and secure fixation of the first sand core 4 can be ensured. After the first sand core 4 is assembled and fastened, it only needs to fill the sand filling port 405 with sand to perfectly realize the accurate assembly of the first sand core 4. This device and core assembly method not only achieves the precise positioning and secure fixation of the sand core, but also ensures that the sand core does not float during casting, and finally realizes the uniform wall thickness of the oil-water channel barrier layer in the inner cavity of the distribution body. It can ensure the precise assembly and firm fixation of each individual sand core of the distributor, avoid problems such as displacement or tilt during core assembly and pouring, and ensure the quality of castings.
[0053] A sixth positioning core head 19 connected to the lower outer mold 3 is provided at the bottom of the fifth sand core 9 , and an upper nail core head 22 is provided at the outer end of the fifth sand core 9 for fast and stable positioning and connection with the lower outer mold 3 .
[0054] The core assembly device 6 includes a core assembly rod 601, a core assembly stopper 602, and a fastening nut 603. The core assembly rod 601 is arranged through the connecting hole 404, the core assembly stopper 602 is fixed to the bottom end of the core assembly rod 601, and can be adapted to the bottom surface of the lower outer mold 3, and the sand filling port 405 can accommodate the fastening nut 603. A gasket 604 is provided between the fastening nut 603 and the core assembly rod 601.
[0055] The core assembly limiting piece 602 is arranged at the bottom end of the core assembly rod 601 , and the core assembly limiting piece 602 is limited by the bottom surface of the lower outer mold 3 . The fastening nut 603 is arranged on the top end of the core assembly rod 601 through a thread and presses the first sand core 4 onto the lower outer mold 3 .
[0056] When designing the core assembly process of the eighth sand core 14 and the ninth sand core 13, they are cleverly assembled onto the upper outer mold 12 first, and then assembled as a whole, i.e., the upper sand core group 16. When assembling the core, the upper sand core group 16 is assembled first, and then turned over and combined with the lower sand core group 15, thereby completing the assembly of the entire sand mold component.
[0057] The above are only preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, several modifications and improvements can be made without departing from the structure of the present invention, which will not affect the effect of the implementation of the present invention and the practicality of the patent.
Claims
1. A method for rapid casting of a large marine engine distributor, characterized in that: The casting method comprises: arranging a pouring flow channel (2) on one side of a sand core group, arranging a vertical ingate (201) on the pouring flow channel (2) to align with a vertical interlayer mold cavity in a mold cavity of the sand core group, and arranging a horizontal ingate (202) to align with a horizontal interlayer mold cavity in a mold cavity of the sand core group, molten iron flows into the pouring flow channel (2) and fills the mold cavity of the sand core group through the vertical ingate (201) and the horizontal ingate (202) to obtain a distribution body (1); The casting method further comprises: arranging a vertical runner (204) at the bottom end of a pouring cup (203) of a pouring runner (2), arranging a first horizontal runner (205) at the bottom end of the vertical runner (204), arranging a second horizontal runner (206) above both ends of the first horizontal runner (205), and arranging a vertically extending vertical ingate (201) and a horizontally extending horizontal ingate (202) on the inner side of the second horizontal runner (206); A filter screen (207) is provided between the vertical runner (204) and the first horizontal runner (205), and a slag collecting bag (208) extending upward is provided on the second horizontal runner (206); The sand core group comprises an upper sand core group (16) and a lower sand core group (15); the pouring runner (2) is arranged in the upper sand core group (16) and the lower sand core group (15); a plurality of sand cores are arranged in the mold cavities in the upper sand core group (16) and the lower sand core group (15); The lower sand core group (15) comprises a lower outer mold (3) and a first sand core (4), a second sand core (11), a third sand core (5), a fourth sand core (7), a fifth sand core (9) and a sixth sand core (8) mounted on the lower outer mold (3); the upper sand core group (16) comprises an upper outer mold (12) and an eighth sand core (14) and a ninth sand core (13) mounted on the upper outer mold (12).
2. A sand core assembly for realizing the rapid casting method of a large marine engine distributor as claimed in claim 1, characterized in that: The invention comprises an upper sand core group (16) and a lower sand core group (15), wherein a pouring channel (2) is provided in the upper sand core group (16) and the lower sand core group (15), and a plurality of sand cores are provided in the mold cavities of the upper sand core group (16) and the lower sand core group (15); the pouring channel (2) is provided with a vertical ingate (201) arranged for the vertical interlayer mold cavity in the mold cavity of the sand core group, and a horizontal ingate (202) arranged for the horizontal interlayer mold cavity in the mold cavity of the sand core group; A vertical runner (204) is provided at the bottom end of the pouring cup (203) of the pouring runner (2), a first horizontal runner (205) is provided at the bottom end of the vertical runner (204), second horizontal runners (206) are provided above both ends of the first horizontal runner (205), and the vertical ingates (201) and the horizontal ingates (202) are provided on the inner side of the second horizontal runner (206); The lower sand core group (15) comprises a lower outer mold (3) and a first sand core (4), a second sand core (11), a third sand core (5), a fourth sand core (7), a fifth sand core (9) and a sixth sand core (8) mounted on the lower outer mold (3); the upper sand core group (16) comprises an upper outer mold (12) and an eighth sand core (14) and a ninth sand core (13) mounted on the upper outer mold (12).
3. The sand core assembly according to claim 2, characterized in that: The first sand core (4) is arranged at a side away from the pouring runner (2), and a core assembly device (6) connected to the lower outer mold (3) is provided on the first sand core (4); the sixth sand core (8) is inserted at one end of the lower outer mold (3), and the fifth sand core (9) is arranged at one end of the lower outer mold (3); the end of the sixth sand core (8) is laterally protruding and provided with a connecting core head (17) connected to the fifth sand core (9), and a conformal positioning fastening rod (10) is provided between the connecting core head (17) and the fifth sand core (9).
4. The sand core assembly according to claim 3, characterized in that: The core assembly device (6) comprises a core assembly rod (601), a core assembly limiting plate (602), and a fastening nut (603).