A core-pulling type oil pump die-casting mold and its molding method

Abstract

This invention discloses a core-pulling type oil pump die-casting mold and its forming method, belonging to the field of die-casting mold technology. During the forming process of the oil pump housing, the main cavity of the oil pump housing is formed by the cooperation of an upper insert block, a lower forming seat, a first protrusion, a second protrusion, and a third protrusion; the pipe section of the oil pump housing is formed by the cooperation of a first core-pulling block and a second core-pulling block; the outer wall surface of the oil pump housing is formed by the cooperation of a front forming block, a left forming block, a right forming block, an upper mold core, and a lower mold core; and the mounting holes of the oil pump housing are formed by the cooperation of the various components. This integrated forming of the oil pump housing not only effectively improves die-casting efficiency and ensures the production efficiency of the oil pump housing, but also, through the reasonable configuration of the size, shape, and position of the mold core, allows for smooth demolding of the oil pump housing, effectively reducing damage to the oil pump housing and ensuring the finished product quality and yield.

Description

Technical Field

[0001] This invention relates to the field of die-casting mold technology, specifically to a core-pulling type oil pump die-casting mold and its forming method. Background Technology

[0002] The "horizontal cold chamber die casting machine" is one of the most widely used and core equipment types in the metal die casting industry, and is especially suitable for producing castings with high melting points such as aluminum alloys and magnesium alloys.

[0003] like Figure 1 As shown, the oil pump housing 3 is composed of a top parting section 31, a bottom parting section 32, a front parting section 33, a left parting section 34, a right parting section 35, and a pipe section 36. The oil pump housing 3 also has a main chamber 37 inside. It is difficult to achieve a high height by using an integral molding method, and demolding is difficult.

[0004] Based on this, the present invention designs a core-pulling oil pump die-casting mold and its molding method to solve the above problems. Summary of the Invention

[0005] In view of the above-mentioned shortcomings of the existing technology, the present invention provides a core-pulling oil pump die-casting mold and its molding method.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A core-pulling type oil pump die casting mold includes an upper mold frame and a lower mold frame that can be mated together. The upper mold core and the lower mold core are respectively embedded in the middle part of the upper mold frame and the lower mold core. After the upper mold core and the lower mold core are mated together, they form a molding cavity that can form an oil pump housing.

[0008] The front, left, and right sides of the lower mold frame are respectively equipped with a front forming mechanism, a left forming mechanism, and a right forming mechanism, and the right side of the lower mold frame is also equipped with a core-pulling forming mechanism.

[0009] The core-pulling forming mechanism includes an arc-shaped moving component, a first core-pulling block, and a second core-pulling block. The arc-shaped moving component is mounted on the lower mold frame. The first core-pulling block is fixedly mounted on the moving end of the arc-shaped moving component. The second core-pulling block is fixedly mounted on the moving end of the left forming mechanism. The first core-pulling block and the second core-pulling block cooperate to form the inner cavity of the pipe section of the oil pump housing.

[0010] Furthermore, both the first and second core-pulling blocks have interlocking convex and concave structures near their proximal ends to ensure accurate alignment.

[0011] Furthermore, the arc-shaped moving assembly includes a fourth hydraulic cylinder, a fourth slider, a driving block, a connecting rod, and an arc-shaped track. The fourth hydraulic cylinder is fixedly installed on the right end of the lower mold frame via a bracket. The driving block is slidably installed on the lower mold frame, and the output end of the fourth hydraulic cylinder is fixedly connected to the fourth slider. The arc-shaped track is fixedly installed on the upper end of the lower mold frame, and the fourth slider is slidably connected to the arc-shaped track. A straight groove is provided on the driving block, and the straight groove is perpendicular to the sliding direction of the driving block. One end of the connecting rod is fixedly connected to the fourth slider, and the other end of the connecting rod is slidably connected to the straight groove. The fourth slider is fixedly connected to the second core-pulling block, and the arc-shaped track and the second core-pulling block are on the same arc.

[0012] Furthermore, an upper insert block is fixedly installed at the lower end of the upper mold core, and a lower forming seat is fixedly installed at the upper end of the lower mold core. The upper insert block is used to form the top parting portion of the oil pump housing, and the lower forming seat is used to form the bottom parting portion of the oil pump housing.

[0013] Furthermore, the front forming mechanism includes a first hydraulic cylinder, a first slider, a front forming block, and a front forming rod. The first hydraulic cylinder is fixedly installed at the front end of the lower mold frame via a bracket. The first slider is slidably installed at the upper end of the lower mold frame. The output end of the first hydraulic cylinder is fixedly connected to the first slider. The front forming block and the front forming rod are fixedly installed at the end of the first slider away from the first hydraulic cylinder. The front forming block is used to form the front parting section of the oil pump housing, and the front forming rod is used to form the mounting hole on the front side of the oil pump housing.

[0014] Furthermore, the left-side forming mechanism includes a second hydraulic cylinder, a second slider, a left-side forming block, and a left-side forming rod. The second hydraulic cylinder is fixedly installed at the front end of the lower mold frame via a bracket. The second slider is slidably installed at the upper end of the lower mold frame. The output end of the second hydraulic cylinder is fixedly connected to the second slider. The left-side forming block and the left-side forming rod are fixedly installed at the end of the second slider away from the second hydraulic cylinder. The left-side forming block is used to form the left-side parting section of the oil pump housing, and the left-side forming rod is used to form the mounting hole on the left side of the oil pump housing.

[0015] Furthermore, the right-side forming mechanism includes a third hydraulic cylinder, a third slider, a right-side forming block, and a right-side forming rod. The third hydraulic cylinder is fixedly installed at the front end of the lower mold frame via a bracket. The third slider is slidably installed at the upper end of the lower mold frame. The output end of the third hydraulic cylinder is fixedly connected to the third slider. The right-side forming block and the right-side forming rod are fixedly installed at the end of the third slider away from the third hydraulic cylinder. The right-side forming block is used to form the right-side parting section of the oil pump housing, and the right-side forming rod is used to form the mounting hole on the right side of the oil pump housing.

[0016] Furthermore, a first protrusion, a second protrusion, and a third protrusion are fixedly installed on the front molding block, the left molding block, and the right molding block, respectively. When the upper mold frame and the lower mold frame are fully closed, the upper and lower ends of the first protrusion are in contact with the upper insert block and the lower molding seat, respectively, and the left and right ends of the lower molding seat are in contact with the second protrusion and the third protrusion, respectively. The upper insert block, the lower molding seat, the first protrusion, the second protrusion, and the third protrusion cooperate to form the main cavity of the oil pump housing.

[0017] Furthermore, the upper ends of the first, second, third, and fourth sliders are all set as inclined surfaces, and multiple locking inclined blocks corresponding to the four sliders and sliding in coordination are fixedly installed on the upper mold frame and upper mold core.

[0018] To better achieve the objectives of this invention, this invention also provides a molding method for a core-pulling type oil pump die-casting mold, comprising the following steps:

[0019] Step 1: Start the first, second and third oil cylinders in sequence to put the front forming block, left forming block and right forming block into place one after another. Then start the fourth oil cylinder to move the first core-pulling block along the arc track until the first core-pulling block and the second core-pulling block are aligned.

[0020] Step 2: The upper mold frame and the lower mold frame are closed. The moving parts are locked by the locking wedge block. Material is injected into the forming cavity. The upper insert block, the lower forming seat, the first protrusion, the second protrusion and the third protrusion cooperate to form the main cavity of the oil pump housing. The first core pulling block and the second core pulling block cooperate to form the pipe part of the oil pump housing. The front forming block, the left forming block, the right forming block, the upper mold core and the lower mold core cooperate to form the outer wall surface of the oil pump housing. The front forming rod, the left forming rod and the right forming rod cooperate to form the mounting hole of the oil pump housing.

[0021] Step 3: After the oil pump housing is formed, the upper mold frame and the lower mold frame are separated.

[0022] Step 4: The fourth oil cylinder first drives the first core-pulling block to reset, causing the first core-pulling block to be pulled out from the pipe of the oil pump housing. Then, the first oil cylinder drives the first slider to reset, causing the front forming block, the front forming rod, and the first protrusion to disengage from the oil pump housing. Finally, the second and third oil cylinders drive the second and third sliders to reset, causing the left forming block, the left forming rod, the second protrusion, the second core-pulling block, the right forming block, the right forming rod, and the third protrusion to disengage from the oil pump housing, so that the ejector pin can smoothly hold the oil pump housing from the lower mold core.

[0023] Compared with the prior art, the beneficial effects of this invention are as follows: In the forming process of the oil pump housing, the upper insert block, lower forming seat, first protrusion, second protrusion, and third protrusion cooperate to form the main cavity of the oil pump housing; the first core-pulling block and second core-pulling block cooperate to form the tube part of the oil pump housing; the front forming block, left forming block, right forming block, upper mold core, and lower mold core cooperate to form the outer wall surface of the oil pump housing; and the front forming rod, left forming rod, and right forming rod cooperate to form the mounting hole of the oil pump housing. Through the cooperation of each component, the oil pump housing is integrally formed, which not only effectively improves the die-casting efficiency and ensures the production efficiency of the oil pump housing, but also, through the reasonable configuration of the size, shape, and position of the mold core, enables the oil pump housing to be demolded smoothly, effectively reducing damage to the oil pump housing and ensuring the finished product quality and yield of the oil pump housing. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are merely some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without any creative effort.

[0025] Figure 1 The three-dimensional structure of the oil pump housing Figure 1 ;

[0026] Figure 2 The three-dimensional structure of the oil pump housing Figure 2 ;

[0027] Figure 3 This invention relates to a three-dimensional die-casting mold for a core-pulling type oil pump. Figure 1 ;

[0028] Figure 4 This invention relates to a three-dimensional die-casting mold for a core-pulling type oil pump. Figure 2 ;

[0029] Figure 5 This is a perspective view of the lower mold frame of the present invention;

[0030] Figure 6 This is a perspective view of the upper mold frame of the present invention;

[0031] Figure 7 This is a perspective view of the core-pulling forming mechanism of the present invention;

[0032] Figure 8 This is a perspective view of the lower mold core of the present invention;

[0033] Figure 9 This is a perspective view of the lower mold core of the present invention.

[0034] The labels in the diagram represent:

[0035] 10. Upper mold frame; 11. Upper mold core; 12. Upper insert block; 20. Lower mold frame; 21. Lower mold core; 22. Lower forming seat; 3. Oil pump housing; 31. Top parting section; 32. Bottom parting section; 33. Front parting section; 34. Left parting section; 35. Right parting section; 36. Tube section; 37. Main chamber; 4. Front forming mechanism; 41. First oil cylinder; 42. First slider; 43. Front forming block; 44. Front forming rod; 45. First protrusion; 5. Left forming machine Structure; 51. Second hydraulic cylinder; 52. Second slider; 53. Left forming block; 54. Left forming rod; 55. Second protrusion; 6. Right forming mechanism; 61. Third hydraulic cylinder; 62. Third slider; 63. Right forming block; 64. Right forming rod; 65. Third protrusion; 7. Core-pulling forming mechanism; 71. Fourth hydraulic cylinder; 72. Fourth slider; 73. Drive block; 74. Connecting rod; 75. Arc track; 76. First core-pulling block; 77. Second core-pulling block; 8. Locking inclined block. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0037] In some embodiments, please refer to the accompanying drawings. Figures 1-9 A molding method for a core-pulling type oil pump die casting mold includes an upper mold frame 10 and a lower mold frame 20 that can be matched and paired. The upper mold frame 10 and the lower mold frame 20 are respectively fitted with an upper mold core 11 and a lower mold core 21 in the middle part. After the upper mold core 11 and the lower mold core 21 are matched, they form a molding cavity that can form an oil pump housing 3.

[0038] The front forming mechanism 4, the left forming mechanism 5, and the right forming mechanism 6 are respectively installed on the front, left, and right sides of the lower mold frame 20, and a core-pulling forming mechanism 7 is also installed on the right side of the lower mold frame 20.

[0039] The core-pulling forming mechanism 7 includes an arc-shaped moving component, a first core-pulling block 76, and a second core-pulling block 77. The arc-shaped moving component is mounted on the lower mold frame 20. The first core-pulling block 76 is fixedly mounted on the moving end of the arc-shaped moving component. The second core-pulling block 77 is fixedly mounted on the moving end of the left forming mechanism 5. The first core-pulling block 76 and the second core-pulling block 77 cooperate to form the inner cavity of the pipe section 36 of the oil pump housing 3.

[0040] In this embodiment, the first core-pulling block 76 and the second core-pulling block 77 are provided with interlocking concave and convex structures near their proximal ends so that they can be accurately aligned.

[0041] The arc-shaped moving assembly includes a fourth hydraulic cylinder 71, a fourth slider 72, a drive block 73, a connecting rod 74, and an arc-shaped track 75. The fourth hydraulic cylinder 71 is fixedly installed on the right end of the lower mold frame 20 via a bracket. The drive block 73 is slidably installed on the lower mold frame 20, and the output end of the fourth hydraulic cylinder 71 is fixedly connected to the fourth slider 72. The arc-shaped track 75 is fixedly installed on the upper end of the lower mold frame 20, and the fourth slider 72 is slidably connected to the arc-shaped track 75. A straight groove is provided on the drive block 73, and the straight groove is perpendicular to the sliding direction of the drive block 73. One end of the connecting rod 74 is fixedly connected to the fourth slider 72, and the other end of the connecting rod 74 is slidably connected to the straight groove. The fourth slider 72 is fixedly connected to the second core-pulling block 77, and the arc-shaped track 75 and the second core-pulling block 77 are on the same arc.

[0042] In this invention, the fourth oil cylinder 71 pushes the drive block 73, which in turn pushes the connecting rod 74 through the straight groove. The connecting rod 74 then drives the fourth slider 72 to slide along the arc track 75, thereby controlling the engagement and separation of the first core-pulling block 76 and the second core-pulling block 77, and meeting the integral molding requirement of the pipe section 36 of the oil pump housing 3.

[0043] The upper mold core 11 is fixedly installed with an upper insert block 12 at its lower end, and the lower mold core 21 is fixedly installed with a lower forming seat 22 at its upper end. The upper insert block 12 is used to form the top parting portion 31 of the oil pump housing 3, and the lower forming seat 22 is used to form the bottom parting portion 32 of the oil pump housing 3.

[0044] The front forming mechanism 4 includes a first hydraulic cylinder 41, a first slider 42, a front forming block 43, and a front forming rod 44. The first hydraulic cylinder 41 is fixedly installed at the front end of the lower mold frame 20 by a bracket. The first slider 42 is slidably installed at the upper end of the lower mold frame 20. The output end of the first hydraulic cylinder 41 is fixedly connected to the first slider 42. The front forming block 43 and the front forming rod 44 are fixedly installed at the end of the first slider 42 away from the first hydraulic cylinder 41. The front forming block 43 is used to form the front parting portion 33 of the oil pump housing 3, and the front forming rod 44 is used to form the mounting hole on the front side of the oil pump housing 3.

[0045] The left-side forming mechanism 5 includes a second hydraulic cylinder 51, a second slider 52, a left-side forming block 53, and a left-side forming rod 54. The second hydraulic cylinder 51 is fixedly installed at the front end of the lower mold frame 20 by a bracket. The second slider 52 is slidably installed at the upper end of the lower mold frame 20. The output end of the second hydraulic cylinder 51 is fixedly connected to the second slider 52. The left-side forming block 53 and the left-side forming rod 54 are fixedly installed at the end of the second slider 52 away from the second hydraulic cylinder 51. The left-side forming block 53 is used to form the left-side parting portion 34 of the oil pump housing 3, and the left-side forming rod 54 is used to form the mounting hole on the left side of the oil pump housing 3.

[0046] The right-side forming mechanism 6 includes a third hydraulic cylinder 61, a third slider 62, a right-side forming block 63, and a right-side forming rod 64. The third hydraulic cylinder 61 is fixedly installed at the front end of the lower mold frame 20 by a bracket. The third slider 62 is slidably installed at the upper end of the lower mold frame 20. The output end of the third hydraulic cylinder 61 is fixedly connected to the third slider 62. The right-side forming block 63 and the right-side forming rod 64 are fixedly installed at the end of the third slider 62 away from the third hydraulic cylinder 61. The right-side forming block 63 is used to form the right-side parting portion 35 of the oil pump housing 3, and the right-side forming rod 64 is used to form the mounting hole on the right side of the oil pump housing 3.

[0047] The front molding block 43, the left molding block 53 and the right molding block 63 are respectively fixedly installed with a first protrusion 45, a second protrusion 55 and a third protrusion 65. When the upper mold frame 10 and the lower mold frame 20 are fully closed, the upper end and the lower end of the first protrusion 45 are respectively attached to the upper insert block 12 and the lower molding seat 22, and the left end and the right end of the lower molding seat 22 are respectively attached to the second protrusion 55 and the third protrusion 65. The upper insert block 12, the lower molding seat 22, the first protrusion 45, the second protrusion 55 and the third protrusion 65 cooperate to form the main chamber 37 of the oil pump housing 3.

[0048] In this invention, the upper ends of the first slider 42, the second slider 52, the third slider 62 and the fourth slider 72 are all set as inclined surfaces. Multiple locking inclined blocks 8 corresponding to the four sliders and sliding in cooperation are fixedly installed on the upper mold frame 10 and the upper mold core 11. When the upper mold frame 10 and the lower mold frame 20 are fully closed, the locking inclined blocks 8 provide locking force to the corresponding sliders to ensure that the mold is closed in place and improve the molding accuracy of the finished product.

[0049] In some embodiments, such as Figures 1-9 As shown, in a preferred embodiment of the present invention, a method for forming a die-casting mold for a core-pulling oil pump includes the following steps:

[0050] Step 1: Start the first hydraulic cylinder 41, the second hydraulic cylinder 51 and the third hydraulic cylinder 61 in sequence to put the front forming block 43, the left forming block 53 and the right forming block 63 into place one after another. Then start the fourth hydraulic cylinder 71 to move the first core-pulling block 76 along the arc track 75 until the first core-pulling block 76 and the second core-pulling block 77 are engaged.

[0051] Step 2: The upper mold frame 10 and the lower mold frame 20 are closed. The moving parts are locked by the locking wedge block 8. Material is injected into the forming cavity. The upper insert block 12, the lower forming seat 22, the first protrusion 45, the second protrusion 55 and the third protrusion 65 cooperate to form the main chamber 37 of the oil pump housing 3. The first core pulling block 76 and the second core pulling block 77 cooperate to form the pipe part 36 of the oil pump housing 3. The front forming block 43, the left forming block 53, the right forming block 63, the upper mold core 11 and the lower mold core 21 cooperate to form the outer wall surface of the oil pump housing 3. The front forming rod 44, the left forming rod 54 and the right forming rod 64 cooperate to form the mounting hole of the oil pump housing 3.

[0052] Step 3: After the oil pump housing 3 is formed, the upper mold frame 10 and the lower mold frame 20 are separated.

[0053] Step 4: The fourth cylinder 71 first drives the first core-pulling block 76 to reset, so that the first core-pulling block 76 is pulled out from the pipe 36 of the oil pump housing 3. Then the first cylinder 41 drives the first slider 42 to reset, so that the front forming block 43, the front forming rod 44 and the first protrusion 45 are separated from the oil pump housing 3. Finally, the second cylinder 51 and the third cylinder 61 drive the second slider 52 and the third slider 62 to reset, so that the left forming block 53, the left forming rod 54, the second protrusion 55 and the second core-pulling block 77, as well as the right forming block 63, the right forming rod 64 and the third protrusion 65 are separated from the oil pump housing 3, so that the ejector rod can smoothly hold the oil pump housing 3 from the lower mold core 21.

[0054] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A core-pulling type oil pump die-casting mold, comprising an upper mold frame (10) and a lower mold frame (20) capable of mating, wherein an upper mold core (11) and a lower mold core (21) are respectively embedded in the middle portion of the upper mold frame (10) and the lower mold frame (20), and the upper mold core (11) and the lower mold core (21) form a molding cavity capable of forming an oil pump housing (3) after mating, characterized in that: The front molding mechanism (4), the left molding mechanism (5) and the right molding mechanism (6) are respectively installed on the front, left and right sides of the lower mold frame (20), and a core-pulling molding mechanism (7) is also installed on the right side of the lower mold frame (20). The core-pulling forming mechanism (7) includes an arc-shaped moving component, a first core-pulling block (76) and a second core-pulling block (77). The arc-shaped moving component is installed on the lower mold frame (20). The first core-pulling block (76) is fixedly installed on the moving end of the arc-shaped moving component. The second core-pulling block (77) is fixedly installed on the moving end of the left forming mechanism (5). The first core-pulling block (76) and the second core-pulling block (77) cooperate to form the inner cavity of the pipe section (36) of the oil pump housing (3). Both the first core-pulling block (76) and the second core-pulling block (77) have a mating and interlocking concave-convex structure near their near ends so that the two can be accurately aligned. The arc-shaped moving assembly includes a fourth hydraulic cylinder (71), a fourth slider (72), a drive block (73), a connecting rod (74), and an arc-shaped track (75). The fourth hydraulic cylinder (71) is fixedly installed on the right end of the lower mold frame (20) by a bracket. The drive block (73) is slidably installed on the lower mold frame (20), and the output end of the fourth hydraulic cylinder (71) is fixedly connected to the fourth slider (72). The arc-shaped track (75) is fixedly installed on the upper end of the lower mold frame (20), and the fourth slider (72) is slidably connected to the arc-shaped track (75). A straight groove is provided on the drive block (73), and the straight groove is perpendicular to the sliding direction of the drive block (73). One end of the connecting rod (74) is fixedly connected to the fourth slider (72), and the other end of the connecting rod (74) is slidably connected to the straight groove. The fourth slider (72) is fixedly connected to the second core-pulling block (77), and the arc-shaped track (75) and the second core-pulling block (77) are on the same arc. The upper mold core (11) is fixedly installed with an upper insert block (12) at its lower end, and the lower mold core (21) is fixedly installed with a lower forming seat (22) at its upper end. The upper insert block (12) is used to form the top parting part (31) of the oil pump housing (3), and the lower forming seat (22) is used to form the bottom parting part (32) of the oil pump housing (3). The front forming mechanism (4) includes a first oil cylinder (41) and a first slider (42). The first oil cylinder (41) is fixedly installed at the front end of the lower mold frame (20) by a bracket. The first slider (42) is installed at the upper end of the lower mold frame (20) and can slide back and forth. The output end of the first oil cylinder (41) is fixedly connected to the first slider (42). The left-side forming mechanism (5) includes a second oil cylinder (51) and a second slider (52). The second oil cylinder (51) is fixedly installed at the front end of the lower mold frame (20) by a bracket. The second slider (52) is installed at the upper end of the lower mold frame (20) and can slide back and forth. The output end of the second oil cylinder (51) is fixedly connected to the second slider (52). The right-side forming mechanism (6) includes a third oil cylinder (61) and a third slider (62). The third oil cylinder (61) is fixedly installed at the front end of the lower mold frame (20) by a bracket. The third slider (62) is installed at the upper end of the lower mold frame (20) and can slide back and forth. The output end of the third oil cylinder (61) is fixedly connected to the third slider (62).

2. The die-casting mold for a core-pulling oil pump according to claim 1, characterized in that, The front forming mechanism (4) further includes a front forming block (43) and a front forming rod (44). The front forming block (43) and the front forming rod (44) are fixedly installed at one end of the first slider (42) away from the first oil cylinder (41). The front forming block (43) is used to form the front parting part (33) of the oil pump housing (3), and the front forming rod (44) is used to form the mounting hole on the front of the oil pump housing (3).

3. The die-casting mold for a core-pulling oil pump according to claim 2, characterized in that, The left-side forming mechanism (5) also includes a left-side forming block (53) and a left-side forming rod (54). The left-side forming block (53) and the left-side forming rod (54) are fixedly installed at the end of the second slider (52) away from the second oil cylinder (51). The left-side forming block (53) is used to form the left-side parting section (34) of the oil pump housing (3), and the left-side forming rod (54) is used to form the mounting hole on the left side of the oil pump housing (3).

4. The die-casting mold for a core-pulling oil pump according to claim 3, characterized in that, The right-side forming mechanism (6) also includes a right-side forming block (63) and a right-side forming rod (64). The right-side forming block (63) and the right-side forming rod (64) are fixedly installed at the end of the third slider (62) away from the third oil cylinder (61). The right-side forming block (63) is used to form the right-side parting section (35) of the oil pump housing (3), and the right-side forming rod (64) is used to form the mounting hole on the right side of the oil pump housing (3).

5. The die-casting mold for a core-pulling oil pump according to claim 4, characterized in that, The front molding block (43), the left molding block (53) and the right molding block (63) are respectively fixedly installed with a first protrusion (45), a second protrusion (55) and a third protrusion (65). When the upper mold frame (10) and the lower mold frame (20) are fully closed, the upper end and the lower end of the first protrusion (45) are respectively attached to the upper insert block (12) and the lower molding seat (22), and the left end and the right end of the lower molding seat (22) are respectively attached to the second protrusion (55) and the third protrusion (65). The upper insert block (12), the lower molding seat (22), the first protrusion (45), the second protrusion (55) and the third protrusion (65) cooperate to form the main chamber (37) of the oil pump housing (3).

6. The die-casting mold for a core-pulling oil pump according to claim 5, characterized in that, The upper ends of the first slider (42), the second slider (52), the third slider (62) and the fourth slider (72) are all set as inclined surfaces. Multiple locking inclined blocks (8) corresponding to the four and sliding in coordination are fixedly installed on the upper mold frame (10) and the upper mold core (11).

7. A molding method, utilizing the core-pulling oil pump die-casting mold as described in claim 6, characterized in that, Includes the following steps: Step 1: Start the first cylinder (41), the second cylinder (51) and the third cylinder (61) in sequence to make the front molding block (43), the left molding block (53) and the right molding block (63) take place one after another. Then start the fourth cylinder (71) to make the first core-pulling block (76) move along the arc track (75) until the first core-pulling block (76) and the second core-pulling block (77) are aligned. Step 2: The upper mold frame (10) and the lower mold frame (20) are closed. The moving parts are locked by the locking wedge (8). Material is injected into the molding cavity. The upper insert block (12), the lower molding seat (22), the first protrusion (45), the second protrusion (55) and the third protrusion (65) cooperate to form the main chamber (37) of the oil pump housing (3). The first core-pulling block (76) and the second core-pulling block (77) cooperate to form the pipe (36) of the oil pump housing (3). The front molding block (43), the left molding block (53), the right molding block (63), the upper mold core (11) and the lower mold core (21) cooperate to form the outer wall of the oil pump housing (3). The front molding rod (44), the left molding rod (54) and the right molding rod (64) cooperate to form the mounting hole of the oil pump housing (3). Step 3: After the oil pump housing (3) is formed, the upper mold frame (10) and the lower mold frame (20) are separated. Step 4: The fourth cylinder (71) first drives the first core-pulling block (76) to reset, so that the first core-pulling block (76) is pulled out from the pipe (36) of the oil pump housing (3). Then the first cylinder (41) drives the first slider (42) to reset, so that the front molding block (43), the front molding rod (44) and the first protrusion (45) are separated from the oil pump housing (3). Finally, the second cylinder (51) and the third cylinder (61) drive the second slider (52) and the third slider (62) to reset, so that the left molding block (53), the left molding rod (54), the second protrusion (55) and the second core-pulling block (77), as well as the right molding block (63), the right molding rod (64) and the third protrusion (65) are separated from the oil pump housing (3), so that the ejector rod can smoothly push the oil pump housing (3) out of the lower mold core (21).

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