Motor valve body end cover casting process and motor valve body end cover

Abstract

The invention relates to the technical field of motor accessory manufacturing, in particular to a motor valve body end cover and a casting process thereof.The casting process comprises the steps that selected argil, pulverized coal, water, a binder, an anti-cracking agent and high-purity clay sand are mixed in proportion, and a uniform mixture is formed; according to the needed size, the mixture obtained in the step S1 is treated through a high-precision core making machine, and an oil duct loam core, a fan-shaped loam core, a 7-shaped loam core, a middle loam core, an upper cover loam core and a lower cover loam core are obtained. By optimizing the structural design of the oil channel, the fan-shaped channel and the 7-shaped channel in the valve body end cover and introducing a fine casting process and strict shot blasting and cleaning treatment, the problems that in the prior art, a through hole in the middle of a motor valve body end cover has many burrs, turbulent flow is likely to be formed, and the liquid circulation speed is affected are effectively solved; the optimized fluid path reduces turbulent flow, and the circulation efficiency is improved.

Description

Technical Field

[0001] The invention relates to the technical field of motor accessory manufacturing, in particular to a motor valve body end cover casting process and a motor valve body end cover. Background Art

[0002] Casting is an ancient manufacturing method. With the development of industrial technology, the quality of large castings directly affects the quality of products. Therefore, casting occupies an important position in the machinery manufacturing industry, and the development of casting technology is also very rapid. In large-scale mechanical equipment, the motor valve body end cover is one of the most common parts. The casting process of the end cover is to pour molten iron into the sand mold and obtain the casting after cooling.

[0003] However, when the prior art is actually used, there are many burrs on the through hole in the middle of the motor valve body end cover, which will form turbulence in the through hole and affect the liquid flow speed. Summary of the invention

[0004] The purpose of the present invention is to provide a motor valve body end cover casting process and a motor valve body end cover to solve the problem that there are many burrs in the through hole in the middle of the motor valve body end cover, which will form turbulence in the through hole and affect the liquid flow rate.

[0005] To achieve the above object, the present invention provides the following technical solution: a casting process for a motor valve body end cover, comprising the following steps: S1. Prepare ingredients: Mix selected clay, coal powder, water, binder, anti-cracking agent and high-purity clay sand in proportion to form a uniform mixture; S2, making a mud core mold: according to the required size, the mixture obtained in step S1 is processed by a high-precision core making machine to respectively obtain an oil channel mud core, a fan-shaped mud core, a 7-shaped mud core, a middle mud core, an upper cover mud core and a lower cover mud core, wherein a pouring port is provided on the top of the upper cover mud core; S3, forming a casting space: fix the oil channel mud core and the fan-shaped mud core, place the oil channel mud core and the 7-shaped mud core in the middle mud core and the lower cover mud core, and make the bottom of the oil channel mud core fit tightly to the bottom of the inner wall of the lower cover mud core, then press the upper cover mud core, the middle mud core and the lower cover mud core from top to bottom in sequence to ensure that the components fit tightly and have no gaps, and apply glue at the joints to fix the oil channel mud core, the fan-shaped mud core, the 7-shaped mud core, the middle mud core, the upper cover mud core and the lower cover mud core, and increase the bonding strength to form a casting space; S4. Embryo smelting: put the prepared motor valve body end cover blank into the smelting furnace for smelting, heat it to 1520-1540℃, melt the blank completely, then add rare earth magnesium alloy for alloying treatment, and remove gas and impurities in the molten iron by vacuum degassing technology to obtain pure casting molten iron, control the tapping temperature at 1450-1480℃, and keep it in a molten metal solution for 0.2-0.4h to ensure uniform alloying; S5, pouring: first, introducing compressed inert gas into the casting space formed in step S3 to remove gas and impurities in the casting space, and then steadily injecting the metal solution obtained in step S4 into the casting space through the pouring mechanism to the pouring port on the top of the upper cover mud core, the pouring temperature is controlled at 1330-1400° C., the pouring time is 10-20 seconds, and after the pouring is completed, the heat preservation treatment is performed for 100-200 minutes, and the demolding is completed after cooling and molding, wherein the oil channel mud core is located in the oil channel, the fan-shaped mud core is located in the fan-shaped channel, and the 7-shaped mud core is located in the 7-shaped channel; S6. Heat treatment: After pouring, open the casting space and take out the valve body end cover, and carry out quenching, cold treatment, tempering and stress relief treatment to further improve the hardness and bearing capacity of the casting, reduce internal stress, and avoid deformation and cracking; S7, recycling: the solid sand mold after demoulding is crushed and screened before recycling; S8. Finished product polishing: Use a shot blasting machine to sequentially perform shot blasting on the first shot blasting port, the second shot blasting port, the third shot blasting port, the fourth shot blasting port and the fifth shot blasting port of the valve body end cover. Finally, extend the shot blasting gun into the oil channel from the sixth shot blasting port and make the shot blasting port face one end of the fan-shaped channel to perform shot blasting on multiple connecting positions in the oil channel mud core. Then, put the valve body end cover into an ultrasonic cleaning machine, and use the high-frequency vibration of ultrasound in combination with cleaning fluid to thoroughly remove residues, oil stains and tiny impurities on the surface of the valve body end cover, reduce defects caused by impurities, and improve the overall product quality.

[0006] Preferably, in step S2, a second positioning protrusion and a first positioning protrusion are respectively provided at the top and bottom of the fan-shaped mud core, a first positioning groove is provided at the top of the oil channel mud core corresponding to the first positioning protrusion, and a second positioning groove is provided at the bottom of the upper cover mud core corresponding to the second positioning protrusion, and a third positioning groove for positioning the oil channel mud core and the 7-shaped mud core is provided at one end at the corresponding positions of the upper cover mud core and the middle mud core, wherein the internal space dimensions of the strokes of the middle mud core, the upper cover mud core and the lower cover mud core are slightly larger than the valve body end cover, and the difference is called the shrinkage margin.

[0007] Preferably, in the step S2, the oil channel mud core, fan-shaped mud core, 7-shaped mud core, middle mud core, upper cover mud core and lower cover mud core need to be deburred after being prepared to make their surfaces smooth. In the step S3, before fixing the oil channel mud core and the fan-shaped mud core, the oil channel mud core, the fan-shaped mud core and the 7-shaped mud core are dipped in paint, and the inner walls of the middle mud core and the lower cover mud core are coated by a coating machine to enhance the high temperature resistance and corrosion resistance of the oil channel mud core, the fan-shaped mud core, the 7-shaped mud core, the middle mud core and the lower cover mud core.

[0008] Preferably, in step S3, before fixing the oil channel mud core and the fan-shaped mud core, the oil channel mud core, the fan-shaped mud core, the middle mud core and the upper cover mud core are pre-installed, and the specific steps are as follows: Insert the first positioning protrusion at the bottom of the fan-shaped mud core into the first positioning groove at the top of the oil channel mud core, and then place the oil channel mud core in the third positioning groove between the middle mud core and the lower cover mud core, and at the same time insert the second positioning protrusion at the top of the fan-shaped mud core into the inner wall of the second positioning groove at the bottom of the upper cover mud core, and ensure that the oil channel mud core does not shake when the middle mud core and the lower cover mud core are pressed together, and ensure that the oil channel mud core and the fan-shaped mud core do not shake when the middle mud core and the upper cover mud core are pressed together, so that after the middle mud core, the upper cover mud core and the lower cover mud core are fixed, the oil channel mud core, the fan-shaped mud core and the 7-shaped mud core will not be displaced inside the middle mud core, the upper cover mud core and the lower cover mud core.

[0009] Preferably, in step S8, the time for shot blasting the first shot blasting port, the second shot blasting port, the third shot blasting port, the fourth shot blasting port and the fifth shot blasting port is 10 to 15 seconds, and the time for shot blasting the multiple connected positions in the oil channel mud core is 8 to 10 seconds.

[0010] Preferably, in step S8, the opening of the fourth shot blasting port is set downward when shot blasting is performed to discharge the residue, and after shot blasting, the residue inside the oil channel, the fan-shaped channel and the 7-shaped channel is blown out by an air gun through the first shot blasting port, the second shot blasting port, the third shot blasting port, the fourth shot blasting port, the fifth shot blasting port and the fourth shot blasting port in sequence.

[0011] The present invention also provides a motor valve body end cover made by the casting process of the above-mentioned motor valve body end cover, comprising a valve body end cover, wherein the middle part of the valve body end cover is respectively provided with an oil passage, a fan-shaped channel and a 7-shaped channel, the oil passage comprises two first shot blasting openings, two third shot blasting openings and two sixth shot blasting openings, the fan-shaped channel comprises two fourth shot blasting openings, the 7-shaped channel comprises two second shot blasting openings and two fifth shot blasting openings; the oil passage comprises six interconnected fluid channels, and the six fluid channels are all connected to the outside to form an optimized fluid path and reduce turbulence, the oil passage is connected to the fan-shaped channel, and the fan-shaped channel passes through the top of the valve body end cover, and the two ends of the 7-shaped channel respectively pass through the valve body end cover.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The present invention optimizes the structural design of the oil passage, fan-shaped passage and 7-shaped passage inside the valve body end cover, and introduces a fine casting process and strict shot blasting and cleaning treatment, thereby effectively solving the problem in the prior art that the through hole in the middle of the motor valve body end cover has many burrs and is prone to form turbulence that affects the liquid circulation speed. The optimized fluid path reduces turbulence and improves circulation efficiency. At the same time, the shot blasting and ultrasonic cleaning processes ensure the surface finish and internal cleanliness of the end cover, further improving the overall product quality and performance. The present invention not only improves the circulation efficiency and performance of the product through innovative channel design and casting process, but also pays attention to environmental protection and efficient utilization of resources. By recycling and reusing the solid sand mold after demolding and using rare earth magnesium alloy for alloying treatment, it not only reduces waste emissions but also enhances the high temperature resistance and corrosion resistance of the casting, embodies the concept of sustainable development, and has positive significance for environmental protection and resource conservation. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention discloses a motor valve body end cover casting process and a motor valve body end cover integral structure explosion Figure 1 ; Figure 2 The present invention discloses a motor valve body end cover casting process and a motor valve body end cover integral structure explosion Figure 2 ; Figure 3 A schematic diagram of a motor valve body end cover casting process and the overall structure of the motor valve body end cover of the present invention; Figure 4 The invention discloses a motor valve body end cover casting process and a motor valve body end cover mud core mold structure explosion Figure 1 ; Figure 5 The invention discloses a motor valve body end cover casting process and a motor valve body end cover mud core mold structure explosion Figure 2 .

[0014] In the figure: 1. Valve body end cover; 11. First shot blasting port; 12. Third shot blasting port; 13. Sixth shot blasting port; 14. Fourth shot blasting port; 15. Second shot blasting port; 16. Fifth shot blasting port; 201, oil channel mud core; 202, fan-shaped mud core; 203, 7-shaped mud core; 204, middle mud core; 205, upper cover mud core; 206, lower cover mud core; 207, first positioning protrusion; 208, first positioning groove; 209, second positioning protrusion; 210, second positioning groove; 211, third positioning groove. DETAILED DESCRIPTION

[0015] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0016] See also Figure 1-5 The present invention provides a technical solution: a motor valve body end cover, comprising a valve body end cover 1, wherein an oil passage, a fan-shaped passage and a 7-shaped passage are respectively opened in the middle of the valve body end cover 1, the oil passage comprises six interconnected fluid passages, and the six fluid passages are all connected to the outside to form an optimized fluid path to reduce turbulence, the oil passage is connected to the fan-shaped passage, and the fan-shaped passage passes through the top of the valve body end cover 1, and the two ends of the 7-shaped passage respectively pass through the valve body end cover 1, the oil passage comprises two first shot blasting openings 11, two third shot blasting openings 12 and two sixth shot blasting openings 13, the fan-shaped passage comprises two fourth shot blasting openings 14 for connecting with other components, and the 7-shaped passage comprises two second shot blasting openings 15 and two fifth shot blasting openings 16 for the entry and exit of liquid or gas.

[0017] The present invention also provides a casting process for a motor valve body end cover, comprising the following steps: S1. Prepare ingredients: Mix selected clay, coal powder, water, binder, anti-cracking agent and high-purity clay sand in a weight fraction ratio of 30%-50%: 5%-15%: 10%-20%: 1%-5%: 0.1%-1%: 40%-60% to form a uniform mixture to improve the strength and air permeability of the sand mold; S2, making a mud core mold: according to the required size, the mixed material obtained in step S1 is processed by a high-precision core making machine to obtain an oil channel mud core 201, a fan-shaped mud core 202, a 7-shaped mud core 203, an intermediate mud core 204, an upper cover mud core 205 and a lower cover mud core 206, wherein the fan-shaped mud core 202 is provided with a second positioning protrusion 209 and a first positioning protrusion 207 at the top and bottom respectively, the oil channel mud core 201 is provided with a first positioning groove 208 at the top corresponding to the position of the first positioning protrusion 207, and the upper cover mud core 205 is provided with a second positioning groove 210 at the bottom corresponding to the position of the second positioning protrusion 209, The upper cover mud core 205 and the middle mud core 204 are provided with a third positioning groove 211 at one end of the corresponding position for positioning the oil channel mud core 201 and the 7-shaped mud core 203. A pouring port is provided at the top of the upper cover mud core 205. The internal space size of the stroke of the middle mud core 204, the upper cover mud core 205 and the lower cover mud core 206 is slightly larger than the valve body end cover 1. The difference is called the shrinkage margin. The oil channel mud core 201, the fan-shaped mud core 202, the 7-shaped mud core 203, the middle mud core 204, the upper cover mud core 205 and the lower cover mud core 206 need to be deburred after being manufactured to make their surfaces smooth. S3, forming a casting space: firstly, the oil channel mud core 201, the fan-shaped mud core 202 and the 7-shaped mud core 203 are dipped in paint, and the inner walls of the middle mud core 204 and the lower cover mud core 206 are coated by a coating machine to enhance the high temperature resistance and corrosion resistance of the oil channel mud core 201, the fan-shaped mud core 202, the 7-shaped mud core 203, the middle mud core 204 and the lower cover mud core 206; It is necessary to pre-install the oil channel mud core 201, the fan-shaped mud core 202, the middle mud core 204 and the upper cover mud core 205, and the specific steps are as follows: Insert the first positioning protrusion 207 at the bottom of the fan-shaped mud core 202 into the first positioning groove 208 at the top of the oil channel mud core 201, and then place the oil channel mud core 201 in the third positioning groove 211 between the middle mud core 204 and the lower cover mud core 206, and at the same time insert the second positioning protrusion 209 at the top of the fan-shaped mud core 202 into the inner wall of the second positioning groove 210 at the bottom of the upper cover mud core 205, and ensure that the oil channel mud core 201 does not shake when the middle mud core 204 and the lower cover mud core 206 are pressed together, and ensure that the oil channel mud core 201 and the fan-shaped mud core 202 do not shake when the middle mud core 204 and the upper cover mud core 205 are pressed together, so that after the middle mud core 204, the upper cover mud core 205 and the lower cover mud core 206 are fixed, the oil channel mud core 201, the fan-shaped mud core 202 and the 7-shaped mud core 203 do not move inside the middle mud core 204, the upper cover mud core 205 and the lower cover mud core 206; Then, insert the first positioning protrusion 207 at the bottom of the fan-shaped mud core 202 into the first positioning groove 208 at the top of the oil channel mud core 201, and insert the second positioning protrusion 209 at the top of the fan-shaped mud core 202 into the inner wall of the second positioning groove 210 at the bottom of the upper cover mud core 205, and apply glue at the connection to fix the oil channel mud core 201 and the fan-shaped mud core 202, and place the oil channel mud core 201 and the 7-shaped mud core 203 on the inner wall of the third positioning groove 211 at the corresponding position of the middle mud core 204 and the lower cover mud core 206, and make the bottom of the oil channel mud core 201 The upper cover mud core 205, the middle mud core 204 and the lower cover mud core 206 are then pressed together from top to bottom to ensure that the components are tightly matched without gaps. At the same time, glue is applied to the joints to fix the oil channel mud core 201, the fan-shaped mud core 202, the 7-shaped mud core 203, the middle mud core 204, the upper cover mud core 205 and the lower cover mud core 206, and the bonding strength is increased to form a casting space. At the same time, a reasonable shrinkage margin is reserved to ensure that the casting will not crack or deform due to shrinkage during the cooling process; S4. Embryo smelting: put the prepared motor valve body end cover blank into the smelting furnace for smelting, heat it to 1520-1540℃, melt the blank completely, then add rare earth magnesium alloy for alloying treatment, and remove gas and impurities in the molten iron by vacuum degassing technology to obtain pure casting molten iron, control the tapping temperature at 1450-1480℃, and keep it in a molten metal solution for 0.2-0.4h to ensure uniform alloying; S5, pouring: first, introduce compressed inert gas into the casting space formed in step S3 to remove gas and impurities in the casting space, then steadily inject the metal solution obtained in step S4 into the casting space through the pouring mechanism to the pouring port on the top of the upper cover mud core 205, the pouring temperature is controlled at 1330-1400°C, the pouring time is 10-20 seconds, and after the pouring is completed, the heat preservation treatment is carried out for 100-200 minutes, and the demolding is completed after cooling and molding, wherein the oil channel mud core 201 is located in the oil channel, the fan-shaped mud core 202 is located in the fan-shaped channel, and the 7-shaped mud core 203 is located in the 7-shaped channel; S6. Heat treatment: After pouring, open the casting space and take out the valve body end cover 1, and perform the following heat treatment: Quenching: put the valve body end cover 1 into a quenching furnace and heat it to 800-900℃ and keep it warm for 100-200min; Cold treatment: oil cooling is performed immediately after quenching, the cold treatment temperature is 0~-50℃, and the time is 2h. The hardness of the valve body end cover 1 is improved through the design of quenching process and cold treatment process, so as to avoid deformation and cracking caused by large internal stress of the valve body end cover 1 during use; Tempering: After cold treatment, tempering is carried out, maintaining the tempering temperature at 150-240°C for 3-4 hours, and then cooling in the air; Stress relief: After tempering, the temperature is kept at 120-150°C for 6-8 hours for stress relief treatment. The internal stress of the valve body end cover 1 is further reduced through stress relief treatment, thereby improving the bearing capacity of the valve body end cover 1; S7, recycling: the solid sand mold after demoulding is crushed and screened before recycling; S8, finished product polishing: the first shot blasting opening 11, the second shot blasting opening 15, the third shot blasting opening 12, the fourth shot blasting opening 14 and the fifth shot blasting opening 16 of the valve body end cover 1 are shot blasted in sequence by a shot blasting machine, and finally a shot blasting gun is extended into the oil passage from the sixth shot blasting opening 13 and the shot blasting opening is directed toward one end of the fan-shaped channel position to perform shot blasting on multiple connecting positions in the oil passage mud core 201, wherein the time for shot blasting the first shot blasting opening 11, the second shot blasting opening 15, the third shot blasting opening 12, the fourth shot blasting opening 14 and the fifth shot blasting opening 16 is 10 to 15 seconds, and the time for shot blasting multiple connecting positions in the oil passage mud core 201 is 8 to 10 seconds; During the shot blasting treatment, the fourth shot blasting port 14 is opened downward to discharge the residue, and after the shot blasting treatment, the air gun is used to blow out the residue inside the oil channel, the fan-shaped channel and the 7-shaped channel through the first shot blasting port 11, the second shot blasting port 15, the third shot blasting port 12, the fourth shot blasting port 14, the fifth shot blasting port 16 and the fourth shot blasting port 14 in sequence; Then, the valve body end cover 1 is placed in an ultrasonic cleaning machine, and the high-frequency vibration of the ultrasonic wave is used in combination with a cleaning liquid to thoroughly remove the residues, oil stains and tiny impurities on the surface of the valve body end cover 1, thereby reducing defects caused by impurities and improving the overall product quality.

[0018] The present invention reduces fluid turbulence and improves circulation efficiency through a sophisticated internal channel layout, including oil channels and fan-shaped channels. At the same time, high-precision molding, alloying treatment and vacuum degassing technology are used to ensure the quality of the casting. The mud core mold is deburred after molding to avoid burrs in the oil channels, fan-shaped channels and 7-shaped channels of the valve body end cover 1 after it is manufactured. Shot blasting and ultrasonic cleaning processes are used to thoroughly remove surface and internal impurities to improve the overall smoothness and durability. At the same time, attention is paid to environmental protection, the recycling and reuse of casting waste is realized, and a new level of efficient, environmentally friendly and sustainable motor parts manufacturing is demonstrated.

[0019] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0020] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A casting process for a motor valve body end cover, characterized in that: The following steps are involved: S1. Prepare ingredients: Mix selected clay, coal powder, water, binder, anti-cracking agent and high-purity clay sand in proportion to form a uniform mixture; S2, preparing a mud core mold: using the mixed material obtained in step S1 to process the mixed material using a high-precision core making machine according to the required size, respectively preparing an oil channel mud core (201), a fan-shaped mud core (202), a 7-shaped mud core (203), an intermediate mud core (204), an upper cover mud core (205), and a lower cover mud core (206), wherein a pouring port is provided at the top of the upper cover mud core (205); S3, forming a casting space: fixing the oil channel mud core (201) and the fan-shaped mud core (202), placing the oil channel mud core (201) and the 7-shaped mud core (203) in the middle mud core (204) and the lower cover mud core (206), and making the bottom of the oil channel mud core (201) closely fit the bottom of the inner wall of the lower cover mud core (206), and then pressing the upper cover mud core (205), the middle mud core (204) and the lower cover mud core (206) in sequence from top to bottom to ensure that the components are closely matched and have no gaps, and at the same time applying glue at the joints to fix the oil channel mud core (201), the fan-shaped mud core (202), the 7-shaped mud core (203), the middle mud core (204), the upper cover mud core (205) and the lower cover mud core (206), and increase the bonding strength to form a casting space; S4. Embryo smelting: put the prepared motor valve body end cover blank into the smelting furnace for smelting, heat it to 1520-1540℃, melt the blank completely, then add rare earth magnesium alloy for alloying treatment, and remove gas and impurities in the molten iron by vacuum degassing technology to obtain pure casting molten iron, control the tapping temperature at 1450-1480℃, and keep it in a molten metal solution for 0.2-0.4h to ensure uniform alloying; S5, pouring: first, introducing compressed inert gas into the casting space formed in step S3 to remove gas and impurities in the casting space, then steadily injecting the metal solution obtained in step S4 into the casting space through a pouring mechanism to a pouring port at the top of the upper cover mud core (205), the pouring temperature is controlled at 1330-1400°C, the pouring time is 10-20 seconds, and after the pouring is completed, heat preservation treatment is performed for 100-200 minutes, and the mold is removed after cooling and molding, wherein the oil channel mud core (201) is located in the oil channel, the fan-shaped mud core (202) is located in the fan-shaped channel, and the 7-shaped mud core (203) is located in the 7-shaped channel; S6. Heat treatment: After pouring is completed, the casting space is opened and the valve body end cover (1) is taken out, and quenching, cold treatment, tempering and stress relief treatment are performed to further improve the hardness and bearing capacity of the casting, reduce internal stress, and avoid deformation and cracking; S7, recycling: the solid sand mold after demoulding is crushed and screened before recycling; S8. Finished product polishing: The first shot blasting opening (11), the second shot blasting opening (15), the third shot blasting opening (12), the fourth shot blasting opening (14) and the fifth shot blasting opening (16) of the valve body end cover (1) are shot blasted in sequence by a shot blasting machine. Finally, a shot blasting gun is inserted into the oil passage from the sixth shot blasting opening (13) and the shot blasting opening is directed toward one end of the fan-shaped passage to perform shot blasting on multiple connecting positions in the oil passage mud core (201). Thereafter, the valve body end cover (1) is placed in an ultrasonic cleaning machine. The high-frequency vibration of ultrasonic waves is used in combination with a cleaning liquid to thoroughly remove residues, oil stains and tiny impurities on the surface of the valve body end cover (1), thereby reducing defects caused by impurities and improving overall product quality.

2. The casting process of the motor valve body end cover according to claim 1, characterized in that: In step S2, the fan-shaped mud core (202) is provided with a second positioning protrusion (209) and a first positioning protrusion (207) at the top and bottom, respectively; the oil channel mud core (201) is provided with a first positioning groove (208) at the top corresponding to the first positioning protrusion (207); and the upper cover mud core (205) is provided with a second positioning groove (210) at the bottom corresponding to the second positioning protrusion (209); and the upper cover mud core (205) and the middle mud core (204) are provided with a third positioning groove (211) at one end at corresponding positions for positioning the oil channel mud core (201) and the 7-shaped mud core (203); wherein the internal space dimensions of the stroke of the middle mud core (204), the upper cover mud core (205) and the lower cover mud core (206) are slightly larger than the valve body end cover (1), and the difference is referred to as the shrinkage margin.

3. The casting process of the motor valve body end cover according to claim 2, characterized in that: In the step S2, the oil channel mud core (201), the fan-shaped mud core (202), the 7-shaped mud core (203), the middle mud core (204), the upper cover mud core (205) and the lower cover mud core (206) need to be deburred after being prepared to make their surfaces smooth. In the step S3, before the oil channel mud core (201) and the fan-shaped mud core (202) are fixed, the oil channel mud core (201), the fan-shaped mud core (202) and the 7-shaped mud core (203) are dipped in paint, and the inner walls of the middle mud core (204) and the lower cover mud core (206) are coated by a coating machine to enhance the high temperature resistance and corrosion resistance of the oil channel mud core (201), the fan-shaped mud core (202), the 7-shaped mud core (203), the middle mud core (204) and the lower cover mud core (206).

4. The casting process of the motor valve body end cover according to claim 3, characterized in that: In step S3, before the oil channel mud core (201) and the fan-shaped mud core (202) are fixed, the oil channel mud core (201) and the fan-shaped mud core (202) are pre-installed with the middle mud core (204) and the upper cover mud core (205). The specific steps are as follows: The first positioning protrusion (207) at the bottom of the fan-shaped mud core (202) is inserted into the first positioning groove (208) at the top of the oil channel mud core (201), and then the oil channel mud core (201) is placed in the third positioning groove (211) between the middle mud core (204) and the lower cover mud core (206). At the same time, the second positioning protrusion (209) at the top of the fan-shaped mud core (202) is inserted into the inner wall of the second positioning groove (210) at the bottom of the upper cover mud core (205), and the middle mud core (204) and the lower cover mud core (206) are placed in the third positioning groove (211). ) is pressed together to ensure that the oil channel mud core (201) does not shake, and when the middle mud core (204) and the upper cover mud core (205) are pressed together, ensure that the oil channel mud core (201) and the fan-shaped mud core (202) do not shake, so that after the middle mud core (204), the upper cover mud core (205) and the lower cover mud core (206) are fixed, the oil channel mud core (201), the fan-shaped mud core (202) and the 7-shaped mud core (203) do not move inside the middle mud core (204), the upper cover mud core (205) and the lower cover mud core (206).

5. The casting process of the motor valve body end cover according to claim 4, characterized in that: In step S8, the time for performing shot blasting on the first shot blasting opening (11), the second shot blasting opening (15), the third shot blasting opening (12), the fourth shot blasting opening (14) and the fifth shot blasting opening (16) is 10 to 15 seconds, and the time for performing shot blasting on the multiple connected positions in the oil channel mud core (201) is 8 to 10 seconds.

6. The casting process of the motor valve body end cover according to claim 5, characterized in that: In step S8, during the shot blasting process, the fourth shot blasting port (14) is opened downwardly to allow residue to be discharged, and after the shot blasting process, the residue inside the oil channel, the fan-shaped channel and the 7-shaped channel is blown out by an air gun through the first shot blasting port (11), the second shot blasting port (15), the third shot blasting port (12), the fourth shot blasting port (14), the fifth shot blasting port (16) and the fourth shot blasting port (14) in sequence.

7. A motor valve body end cover manufactured by the casting process of the motor valve body end cover according to any one of claims 1 to 6, comprising a valve body end cover (1), characterized in that: An oil passage, a fan-shaped passage and a 7-shaped passage are respectively provided in the middle of the valve body end cover (1); the oil passage comprises two first shot blasting openings (11), two third shot blasting openings (12) and two sixth shot blasting openings (13); the fan-shaped passage comprises two fourth shot blasting openings (14); and the 7-shaped passage comprises two second shot blasting openings (15) and two fifth shot blasting openings (16); the oil passage comprises six interconnected fluid passages, and the six fluid passages are all connected to the outside to form an optimized fluid path and reduce turbulence; the oil passage is connected to the fan-shaped passage, and the fan-shaped passage passes through the top of the valve body end cover (1); and both ends of the 7-shaped passage pass through the valve body end cover (1) respectively.

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