Casting mold and casting method for engine cylinder cover

Abstract

The invention relates to the technical field of cylinder cover casting, and particularly discloses an engine cylinder cover casting mold and a casting method.The engine cylinder cover casting mold comprises an upper side mold plate, a lower side mold plate, a left side mold plate, a right side mold plate, a front side mold plate, a rear side mold plate and a support, the lower side mold plate is arranged at the top of the support, and a hanging plate is arranged above the support; a limiting frame is arranged between the support and the lifting plate, a vertical cylinder is rotationally assembled in the lifting plate, and a connecting rod slidably arranged in the limiting frame is fixedly mounted on the side wall of the lifting plate; according to the engine cylinder cover casting mold and the casting method, in the mold closing process, after the left side mold plate and the right side mold plate are closed, or the front side mold plate and the rear side mold plate are closed, the vertical cylinder continues to rotate to compress the torsion spring, the ring sleeve and the arc-shaped frame cannot be continuously driven to rotate, and then falling of the vertical rod cannot be affected; and continuous moving mold closing of other mold plates cannot be influenced, so that mold plates of different models and sizes can be subjected to mold closing and mold opening through the equipment.

Description

Technical Field

[0001] The invention relates to the technical field of cylinder head casting, and in particular to a casting mold and a casting method for an engine cylinder head. Background Art

[0002] The engine cylinder is a key component of the internal combustion engine, located where the combustion process occurs in the engine. When casting the engine cylinder head, the molten casting metal is poured into the prepared mold, and the metal is guided into various parts of the mold through the gating system. After the casting metal cools, it solidifies to form the cylinder head.

[0003] In the invention patent with the announcement number CN103658524B, a sand mold for an engine cylinder head is disclosed, such as Figure 1 As shown, it includes at least one water sandwich lower core mold and at least one water sandwich upper core mold, the water sandwich upper core mold is buckled on the water sandwich lower core mold and a mold cavity is formed between the water sandwich lower core mold and the water sandwich upper core mold, and a plurality of movable blocks are respectively located between the water sandwich lower core mold and the water sandwich upper core mold and are all slidably connected to the water sandwich lower core mold on one side of the water sandwich lower core mold, the movable blocks are tilted upward and outwardly arranged, and the inner end of the movable block is inserted into the mold cavity, and the outer end extends to the outside of the water sandwich lower core mold, and the water sandwich upper core mold is provided with a toggle mechanism that can drive the movable block to move back and forth in its tilt direction under the action of external force. The water sandwich lower core mold is fixed on the chassis. The movable blocks include water hole movable blocks and exhaust duct movable blocks. In the present application, the toggle mechanism can move the movable blocks under the action of external force. Compared with the prior art, the present application is not only compact in structure and small in size, but also more practical (more convenient for mold opening), and also easy to manufacture, meeting the production requirements of enterprises.

[0004] However, this solution still has the following problems: it can only cast engine cylinder heads of specific models and cannot be used for engine cylinder heads of different models, resulting in poor versatility of the equipment. When producing engine cylinders of different models, multiple sets of equipment need to be prepared for coordinated use, resulting in high cost. Summary of the invention

[0005] The present invention provides an engine cylinder head casting mold and a casting method, aiming to solve the problem in the related art that only a specific model of engine cylinder head can be cast and different models of engine cylinder heads cannot be used for casting.

[0006] The engine cylinder head casting mold of the present invention comprises an upper template, a lower template, a left template, a right template, a front template, a rear template and a support, wherein the lower template is arranged on the top of the support, a hanging plate is arranged above the support, a limit frame is arranged between the support and the hanging plate, a vertical cylinder is rotatably mounted inside the hanging plate, and a connecting rod slidably arranged in the limit frame is fixedly mounted on the side wall of the hanging plate;

[0007] Two frames and two rods are slidably mounted on the hanging plate. The two rods are symmetrically distributed at both ends of the frame, and the two ends of the rod are slidably mounted inside the two frames, the front template and the rear template are respectively arranged on the two frames, and the left template and the right template are respectively arranged on the two rods;

[0008] A vertical rod is arranged inside the vertical cylinder, and the vertical cylinder can rotate in the hanging plate when the vertical rod is lifted. A pedestal is fixedly installed at the bottom end of the vertical rod, and the upper template is arranged at the bottom of the pedestal.

[0009] Both ends of the vertical cylinder are sleeved with ring sleeves, and two arc-shaped frames are symmetrically fixed on each ring sleeve, which can push the two frames and the two rods to move in opposite directions when the vertical cylinder rotates.

[0010] Preferably, a telescopic rod is fixedly mounted on the top of the support, and a limiting frame is fixedly mounted on the top of the telescopic rod.

[0011] Preferably, the interior of the hanger plate is provided with transverse grooves and circular grooves, there are four transverse grooves which are evenly distributed in a circular shape along the circumferential direction of the vertical tube, there are two circular grooves which are symmetrically distributed on the upper and lower sides of the hanger plate, and each circular groove is connected to the four transverse grooves, and the two ring sleeves are respectively located inside the two circular grooves.

[0012] Preferably, sliders are fixedly mounted on the frame and the rod body, and the multiple sliders are slidably assembled in the four transverse grooves respectively, the bottoms of the sliders on the two frames are fixedly connected to the lower side rods, and the bottom ends of the two lower side rods extend to the circular groove on the lower side of the hanging plate, and the tops of the sliders on the two rod bodies are fixedly connected to the upper side rods, and the top ends of the two upper side rods extend to the circular groove on the upper side of the hanging plate.

[0013] Preferably, a torsion spring is provided between the ring sleeve and the vertical cylinder, and two ends of the torsion spring are respectively fixed to the ring sleeve and the vertical cylinder.

[0014] Preferably, a transmission mechanism is provided between the vertical cylinder and the vertical rod for driving the vertical cylinder to rotate, and a reset assembly is provided between the hanging plate and the vertical rod for rotating and resetting the vertical cylinder when the vertical rod is raised.

[0015] Preferably, the transmission mechanism comprises a protrusion and a slideway, the protrusion is fixedly mounted on the side wall of the vertical rod, the slideway is spirally opened on the inner wall of the vertical tube, and the protrusion is slidably assembled inside the slideway.

[0016] Preferably, the reset assembly includes a pressure plate and a spring, the pressure plate is fixedly mounted on the outside of the vertical rod, the spring is sleeved on the outside of the vertical rod, and two ends of the spring are respectively fixed on the pressure plate and the hanging plate.

[0017] The engine cylinder head casting mold of the present invention comprises the following steps:

[0018] Step 1: Place the sand core on the lower template, and lower the vertical rod with the hanging plate to lower the upper template, the left template, the right template, the front template, and the rear template;

[0019] Step 2: As the left template, right template, front template and rear template move to the surrounding of the lower template, the limit frame blocks and limits the descending connecting rod, the hanging plate stops descending, and the vertical rod continues to descend, so that the protrusion slides along the slideway, pushing the vertical cylinder to rotate, and the pressure plate compresses the spring;

[0020] Step 3: The vertical cylinder drives the ring sleeve to rotate through the torsion spring, so that the arc frame pushes the slider to slide, so that the left template, the right template, the front template and the rear template move together toward the lower template, and the vertical rod continues to descend, so that the upper mold is buckled to the top to complete the mold closing;

[0021] Step 4: Inject casting liquid into the mold after mold closing to cast the workpiece;

[0022] Step 5: After the casting liquid solidifies, the vertical rod and the upper template are lifted. With the cooperation of the pressure plate and the spring to reset, the left template, the right template, the front template and the rear template are dispersed to the surroundings away from the lower template. The hanging plate follows the vertical rod to rise to complete the mold opening.

[0023] Beneficial effects:

[0024] When the present invention is in use, during the mold closing process, after the left template and the right template have completed the mold closing, or after the front template and the rear template have completed the mold closing, the vertical cylinder continues to rotate to compress the torsion spring, and cannot continue to drive the ring sleeve and the arc frame to rotate, thereby not affecting the descent of the vertical rod, and cannot affect the continued movement and mold closing of other templates, so that mold plates of different models and sizes can complete mold closing and mold opening through this equipment. When casting cylinder heads of different models, it only needs to replace the mold plate to quickly cast, thereby enhancing the versatility of the equipment and then reducing the production cost of users. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of a prior art mold.

[0026] Figure 2 It is a perspective view of the present invention.

[0027] Figure 3 It is a front view of the present invention.

[0028] Figure 4 It is a top view of the present invention.

[0029] Figure 5 It is a three-dimensional diagram of the bracket and the arc frame of the present invention.

[0030] Figure 6It is a three-dimensional diagram of the bracket of the present invention.

[0031] Figure 7 It is a stereogram of the pushing mechanism of the present invention.

[0032] Figure 8 It is a cross-sectional view of a hanging plate of the present invention.

[0033] Fig. 9 It is a cross-sectional view of the vertical tube of the present invention.

[0034] Fig.10 It is a three-dimensional diagram of the lifting platform of the present invention.

[0035] Reference numerals:

[0036] 10. Support; 11. Telescopic rod; 12. Limit frame; 20. Hanging plate; 21. Vertical tube; 22. Horizontal groove; 23. Circular groove; 24. Connecting rod; 30. Bracket; 31. Frame; 32. Rod body; 33. Sliding block; 34. Lower rod; 35. Upper rod; 40. Lifting platform; 41. Platform; 42. Vertical rod; 50. Pushing mechanism; 51. Ring sleeve; 52. Arc frame; 53. Torsion spring; 60. Transmission mechanism; 61. Bump; 62. Slide; 70. Reset assembly; 71. Press plate; 72. Spring. DETAILED DESCRIPTION

[0037] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0038] like Figures 2 to 10 As shown, the engine cylinder head casting mold of the present invention includes a mold plate, a support 10, a hanging plate 20, a bracket 30, a lifting platform 40, a pushing mechanism 50, a transmission mechanism 60 and a reset assembly 70. The mold plate is arranged between the support 10, the bracket 30 and the lifting platform 40, the hanging plate 20 is arranged on the outside of the lifting platform 40, the bracket 30 is arranged at the bottom of the hanging plate 20, the pushing mechanism 50 and the transmission mechanism 60 are located inside the hanging plate 20, the hanging plate 20 can be lifted and lowered together with the lifting platform 40, and the pushing mechanism 50 is driven by the transmission mechanism 60 to operate, push the bracket 30 to aggregate, and then realize the mold closing and mold opening of the mold plate, and the reset assembly 70 is located above the hanging plate 20, which can facilitate the reset and mold opening of the mold plate.

[0039] The mold plate includes an upper template, a lower template, a left template, a right template, a front template and a rear template, and the lower template is arranged on the top of the support 10, the upper template is located on the lifting platform 40, and the left template, the right template, the front template and the rear template are all located on the bracket 30. The upper template, the left template, the right template, the front template and the rear template can move away from or approach the lower template as the lifting platform 40 is raised and lowered, thereby realizing the opening and closing of the mold plate.

[0040] refer to Figure 2 and Figure 3 A telescopic rod 11 is fixedly installed on the top of the support 10, and a limit frame 12 is fixedly installed on the top of the telescopic rod 11.

[0041] refer to Figure 2 and Figure 8 The interior of the hanging plate 20 is rotatably equipped with a vertical cylinder 21 for installing the lifting platform 40 and the transmission mechanism 60. The interior of the hanging plate 20 is also provided with a transverse groove 22 and a circular groove 23 to facilitate the installation of the pushing mechanism 50. There are four transverse grooves 22 and they are evenly distributed in a ring shape along the circumferential direction of the vertical cylinder 21. There are two circular grooves 23 symmetrically distributed on the upper and lower sides of the hanging plate 20. Each circular groove 23 is connected to the four transverse grooves 22. The two ends of the vertical cylinder 21 extend to the inside of the two circular grooves 23 respectively. A connecting rod 24 slidably set in the limit frame 12 is fixedly connected to the side wall of the hanging plate 20. The connecting rod 24 can be limited by the limit frame 12 when the hanging plate 20 is descending, so that the hanging plate 20 cannot continue to follow the lifting platform 40 to descend.

[0042] refer to Figure 2 , Figure 5 as well as Figure 6 The bracket 30 is composed of two frames 31 and two rods 32. The two frames 31 are symmetrically distributed. The front template and the rear template are respectively arranged on the two frames 31. The two ends of the rod 32 are respectively slidably assembled inside the two frames 31. The two rods 32 are symmetrically distributed at the two ends of the frame 31. The left template and the right template are respectively arranged on the two rods 32. The two rods 32 can slide along the frame 31, and then adjust the distance between the two rods 32, so that the left template and the rear template are aggregated or separated, and the two frames 31 can also slide along the rod 32, and then adjust the distance between the two frames 31, so that the front template and the rear template are aggregated or separated.

[0043] refer to Figure 5 and Figure 6The frame 31 and the rod body 32 are fixedly mounted with sliders 33, and the multiple sliders 33 are slidably assembled in the four transverse grooves 22 respectively. The bottoms of the sliders 33 on the two frames 31 are fixedly connected with lower side rods 34, and the bottom ends of the two lower side rods 34 extend to the circular groove 23 on the lower side of the hanging plate 20. The tops of the sliders 33 on the two rod bodies 32 are fixedly connected with upper side rods 35, and the top ends of the two upper side rods 35 extend to the circular groove 23 on the upper side of the hanging plate 20. The two lower side rods 34 can be pushed to move in the opposite direction by the pushing mechanism 50, so that the left template and the right template are close to or away from each other. The two upper side rods 35 are pushed in the opposite direction by the pushing mechanism 50, so that the front template and the rear template are close to or away from each other, thereby realizing the mold closing and mold opening.

[0044] refer to Figure 3 , Figure 8 as well as Fig. 9 The lifting platform 40 includes a pedestal 41 and a vertical rod 42. The pedestal 41 is located at the bottom of the hanging plate 20, the upper template is arranged at the bottom of the pedestal 41, the vertical rod 42 is fixedly installed on the top of the pedestal 41, and the vertical rod 42 is slidably assembled inside the vertical tube 21. A hydraulic cylinder is arranged on the top of the vertical rod 42, which can push the vertical rod 42 to slide in the vertical tube 21, and then the pedestal 41 drives the upper template to rise and fall, so as to realize the opening and closing of the mold.

[0045] refer to Figure 5 , Figure 7 and Figure 8 The pushing mechanism 50 includes a ring sleeve 51, an arc frame 52 and a torsion spring 53. The ring sleeve 51 has two ring sleeves, both of which are sleeved on the outside of the vertical cylinder 21, and the two ring sleeves 51 are respectively located in the two circular grooves 23. The arc frame 52 has two symmetrically fixed on the outside of the ring sleeve 51. The two arc frames 52 on one ring sleeve 51 are respectively sleeved on the outside of the two lower side rods 34, and the two arc frames 52 on the other ring sleeve 51 are respectively sleeved on the outside of the two upper side rods 35. The torsion spring 53 is arranged between the ring sleeve 51 and the vertical cylinder 21, and the two ends of the torsion spring 53 are respectively fixed to the ring sleeve 51 and the vertical cylinder 21;

[0046] When the vertical cylinder 21 rotates, the torsion spring 53 drives the arc frame 52 to rotate, so that the arc frame 52 pushes the lower side rod 34 and the upper side rod 35 to move along the transverse groove 22, so that the two lower side rods 34 can move synchronously towards or away from each other, and the two upper side rods 35 can move synchronously towards or away from each other, and then the two frames 31 can drive the front side template and the rear side template to move closer to or away from each other, and the two rod bodies 32 can drive the left side template and the right side template to move closer to or away from each other. When the lower side rod 34 or the upper side rod 35 cannot move due to obstruction of the template, the torsion spring 53 cannot drive the ring sleeve 51 to rotate, and will be compressed with the rotation of the vertical cylinder 21, which will not affect the rotation of the vertical cylinder 21, and then will not affect the continued movement of other templates, and can better adapt to the clamping of mold plates of different models and sizes.

[0047] refer to Figure 8 and Fig. 9 The transmission mechanism 60 includes a protrusion 61 and a slide 62. The protrusion 61 is fixedly installed on the side wall of the vertical rod 42. The slide 62 is spirally opened on the inner wall of the vertical tube 21, and the protrusion 61 is slidably assembled inside the slide 62, so that the vertical rod 42 drives the protrusion 61 to move during lifting, and the protrusion 61 moves along the slide 62, thereby pushing the vertical tube 21 to rotate in the hanging plate 20, and then pushing the torsion spring 53 to rotate with the ring sleeve 51.

[0048] refer to Figure 2 and Figure 3 The reset assembly 70 includes a pressure plate 71 and a spring 72. The pressure plate 71 is fixedly mounted on the outside of the vertical rod 42, and the spring 72 is sleeved on the outside of the vertical rod 42, and the two ends of the spring 72 are respectively fixed on the pressure plate 71 and the hanging plate 20. When the vertical rod 42 descends in the hanging plate 20, the pressure plate 71 can push the spring 72 downward for compression. When the vertical rod 42 rises, the spring 72 gradually stretches and resets, and presses the hanging plate 20 to keep it stationary and unable to follow the vertical rod 42 to rise, so that the vertical rod 42 can drive the protrusion 61 to rise in the vertical tube 21, and push the vertical tube 21 to rotate, so that the arc frame 52 pushes the upper side rod 35 to slide, so that the slider 33 is reset.

[0049] A method for casting an engine cylinder head comprises the following steps:

[0050] Step 1: Place the sand core on the lower template, lower the vertical rod 42 with the hanging plate 20, and then lower the bracket 30, so that the upper template, the left template, the right template, the front template and the rear template are lowered;

[0051] Step 2: As the left template, the right template, the front template and the rear template move to the periphery of the lower template, the limit frame 12 blocks and limits the descending connecting rod 24, the hanging plate 20 stops descending, and the vertical rod 42 continues to descend, so that the protrusion 61 slides along the slideway 62, pushing the vertical cylinder 21 to rotate, and at the same time the pressure plate 71 compresses the spring 72;

[0052] Step 3: The vertical cylinder 21 rotates with the ring sleeve 51 through the torsion spring 53, so that the arc frame 52 pushes the slider 33 to slide, so that the left template, the right template, the front template and the rear template move together toward the lower template, and then the vertical rod 42 continues to descend, so that the upper mold is buckled to the upper side to complete the mold plate clamping;

[0053] Step 4: inject casting liquid into the mold plate after mold closing to cast the workpiece;

[0054] Step 5: After the casting liquid solidifies, the vertical rod 42 and the upper template are lifted, and the spring 72 gradually resets and stretches, pressing the hanging plate 20 to remain stationary, so that it will not be lifted along with the vertical rod 42, and then the vertical rod 42 can drive the vertical tube 21 to rotate, and the left template, the right template, the front template and the rear template are dispersed to the surroundings away from the lower template, and then as the spring 72 is completely reset, the hanging plate 20 is pulled up while the vertical rod 42 is lifted to complete the mold opening.

[0055] In the present invention, the vertical cylinder 21 is driven to rotate during the lifting of the vertical rod 42. Under the cooperation and promotion of the arc frame 52, the mold plate is automatically molded when the upper template is lowered, and the mold plate is automatically opened when the upper template is lifted, thereby making the mold closing and opening more convenient and quick, thereby improving the casting efficiency. In the mold closing process, as the left template and the right template are completed to close the mold, or the front template and the rear template are completed to close the mold, the vertical cylinder 21 continues to rotate to compress the torsion spring 53, and cannot continue to drive the ring sleeve 51 and the arc frame 52 to rotate, thereby not affecting the descent of the vertical rod 42, and cannot affect the continued movement and closing of other templates, so that mold plates of different models and sizes can complete mold closing and opening through this equipment. When casting cylinder heads of different models, it is only necessary to replace the mold plate to quickly cast, thereby enhancing the versatility of the equipment and reducing the production cost of the user.

[0056] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A casting mold for an engine cylinder head, comprising an upper mold plate, a lower mold plate, a left mold plate, a right mold plate, a front mold plate, a rear mold plate and a support (10), wherein the lower mold plate is arranged on the top of the support (10), characterized in that: A hanging plate (20) is arranged above the support (10), a limit frame (12) is arranged between the support (10) and the hanging plate (20), a vertical cylinder (21) is rotatably mounted inside the hanging plate (20), and a connecting rod (24) is fixedly mounted on the side wall of the hanging plate (20) and is slidably arranged in the limit frame (12); Two frames (31) and two rods (32) are slidably mounted on the hanging plate (20), the two rods (32) are symmetrically distributed at the two ends of the frame (31), and the two ends of the rods (32) are slidably mounted inside the two frames (31), the front template and the rear template are respectively arranged on the two frames (31), and the left template and the right template are respectively arranged on the two rods (32); A vertical rod (42) is arranged inside the vertical cylinder (21), and the vertical cylinder (21) can rotate inside the hanging plate (20) when the vertical rod (42) is raised or lowered. A pedestal (41) is fixedly mounted on the bottom end of the vertical rod (42), and an upper template is arranged at the bottom of the pedestal (41); Both ends of the vertical cylinder (21) are sleeved with ring sleeves (51), and two arc-shaped frames (52) are symmetrically fixed on each ring sleeve (51), which can push the two frames (31) and the two rods (32) to move in opposite directions when the vertical cylinder (21) rotates.

2. The engine cylinder head casting mold according to claim 1, characterized in that: A telescopic rod (11) is fixedly mounted on the top of the support (10), and a limiting frame (12) is fixedly mounted on the top of the telescopic rod (11).

3. The engine cylinder head casting mold according to claim 2, characterized in that: The interior of the hanging plate (20) is provided with a transverse groove (22) and a circular groove (23). There are four transverse grooves (22) which are evenly distributed in a circular shape along the circumferential direction of the vertical cylinder (21). There are two circular grooves (23) which are symmetrically distributed on the upper and lower sides of the hanging plate (20). Each circular groove (23) is connected to the four transverse grooves (22). The two ring sleeves (51) are respectively located inside the two circular grooves (23).

4. The engine cylinder head casting mold according to claim 3, characterized in that: The frame (31) and the rod body (32) are both fixedly mounted with sliders (33), and the plurality of sliders (33) are respectively slidably assembled in the four transverse grooves (22); the bottoms of the sliders (33) on the two frame bodies (31) are both fixedly connected with lower side rods (34), and the bottom ends of the two lower side rods (34) extend into the circular groove (23) on the lower side of the hanging plate (20); the tops of the sliders (33) on the two rod bodies (32) are both fixedly connected with upper side rods (35), and the top ends of the two upper side rods (35) extend into the circular groove (23) on the upper side of the hanging plate (20).

5. The engine cylinder head casting mold according to claim 4, characterized in that: A torsion spring (53) is provided between the annular sleeve (51) and the vertical cylinder (21), and two ends of the torsion spring (53) are respectively fixed to the annular sleeve (51) and the vertical cylinder (21).

6. The engine cylinder head casting mold according to claim 5, characterized in that: A transmission mechanism (60) is provided between the vertical cylinder (21) and the vertical rod (42) for driving the vertical cylinder (21) to rotate, and a reset assembly (70) is provided between the hanging plate (20) and the vertical rod (42) for causing the vertical cylinder (21) to rotate and reset when the vertical rod (42) is raised.

7. The engine cylinder head casting mold according to claim 6, characterized in that: The transmission mechanism (60) comprises a protrusion (61) and a slideway (62), wherein the protrusion (61) is fixedly mounted on the side wall of the vertical rod (42), the slideway (62) is spirally opened on the inner wall of the vertical cylinder (21), and the protrusion (61) is slidably assembled inside the slideway (62).

8. The engine cylinder head casting mold according to claim 6, characterized in that: The reset assembly (70) comprises a pressing plate (71) and a spring (72); the pressing plate (71) is fixedly mounted on the outside of the vertical rod (42); the spring (72) is sleeved on the outside of the vertical rod (42); and two ends of the spring (72) are respectively fixed on the pressing plate (71) and the hanging plate (20).

9. A method for casting an engine cylinder head, characterized in that: The engine cylinder head casting mold applicable to claim 8 comprises the following steps: Step 1: Place the sand core on the lower template, and lower the vertical rod (42) with the hanging plate (20), so that the upper template, the left template, the right template, the front template and the rear template are lowered; Step 2: As the left template, the right template, the front template and the rear template move to the periphery of the lower template, the limit frame (12) blocks and limits the descending connecting rod (24), the hanging plate (20) stops descending, and the vertical rod (42) continues to descend, so that the protrusion (61) slides along the slideway (62), pushing the vertical cylinder (21) to rotate, and causing the pressure plate (71) to compress the spring (72); Step 3: The vertical cylinder (21) drives the ring sleeve (51) to rotate through the torsion spring (53), so that the arc frame (52) pushes the slider (33) to slide, so that the left template, the right template, the front template and the rear template move together toward the lower template, and the vertical rod (42) continues to descend so that the upper mold is buckled to the top to complete the mold closing; Step 4: Inject casting liquid into the mold after mold closing to cast the workpiece; Step 5: After the casting liquid solidifies, the vertical rod (42) and the upper template are lifted, and the left template, the right template, the front template and the rear template are dispersed to the surroundings away from the lower template under the cooperation and reset of the pressure plate (71) and the spring (72). Then, the hanging plate (20) rises along with the vertical rod (42) to complete the mold opening.

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