A die casting equipment and method based on machining of an automobile engine thermostat housing

Abstract

The application relates to the field of die casting, and particularly discloses a die casting equipment and method based on automobile engine thermostat shell machining, which comprises a mold cavity formed by a lower mold and an upper mold, the top of the mold cavity is provided with a sprue, the sprue penetrates to the top of the upper mold, metal liquid is poured into the mold cavity from the sprue, and a thermostat shell containing a flange is formed after cooling, a slag collecting bag is formed on the thermostat shell, and the upper end and / or the lower end of the flange close to the inner wall of the mold cavity is provided with a taper block, so that the upper end and / or the lower end of the flange forms a taper pit, and the installation holes around the flange are convenient for subsequent machining. The taper block is arranged at the corresponding position of the flange on the inner wall of the mold cavity, the flange after forming forms a taper pit, an accurate initial positioning reference for subsequent machining of the installation holes is provided, hole position out-of-tolerance caused by micro-displacement of the thermostat shell is avoided, the problem that a drill bit is easy to be deflected and the edge is broken when starting to drill on a smooth end face or a round corner edge is solved, an additional rough milling end face process is not needed, and tool wear and tool cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of die casting technology, and in particular to a die casting equipment and method for machining automotive engine thermostat housings. Background Technology

[0002] The automotive engine thermostat is an automatic temperature-controlled valve installed at the cylinder head outlet in the cooling system. It usually contains a paraffin temperature-sensing element that automatically switches the circulation path according to the coolant temperature. During a cold start, the paraffin has not melted, so the thermostat closes the passage to the radiator, and the coolant only makes a "small circulation" inside the engine to quickly warm up the engine block. When the water temperature rises to the set value (usually 80-90℃), the paraffin expands due to heat and pushes open the valve, and the coolant changes to a "large circulation" through the radiator to remove excess heat, thereby maintaining the engine at the optimal operating temperature, avoiding overcooling or overheating, and balancing combustion efficiency and engine life. Die-casting equipment is the core equipment of pressure casting, mainly composed of a mold clamping mechanism (providing clamping force to prevent mold bulging), an injection mechanism (pressurizing metal into the mold cavity at high speed and high pressure), a hydraulic system, and an electronic control system.

[0003] Regarding die-casting equipment, prior art publication number CN121732747A discloses a die-casting device for high-strength, high-toughness, and lightweight automotive aluminum alloy parts. The device includes a base, a lower mold fixedly connected to the outer wall of the base, an upper mold mounted on the outer wall of the base via a cylinder, and a water tank fixedly connected to the top outer wall of the base. It also includes: a warning mechanism housed in the inner wall of the top of the water tank; a cooling mechanism mounted on the outer wall of the base; and a nozzle mounted on the outer wall of the cooling mechanism via a connecting mechanism. The warning mechanism includes a coolant reservoir, with a stop block fixedly connected to the outer wall of the reservoir. Through the cooperation of the stop block and square blocks, when the coolant in the reservoir is insufficient, a spiral spring drives a rotating shaft and a rotating plate to flip. The rotating plate clearly indicates to the operator that the coolant is low and needs to be added, preventing the operator from failing to detect insufficient coolant in time, thus avoiding problems that could affect the cooling effect.

[0004] In traditional die-casting of thermostat housings, the lack of a special structure designed for the corresponding flange position in the mold cavity results in flange edges that are mostly straight or have natural rounded corners. This leads to a lack of precise initial positioning datum when machining the flange mounting holes, making the housing prone to fretting and causing out-of-tolerance hole positioning. Furthermore, drill bits are highly susceptible to "deviation" or even chipping when starting to drill on smooth end faces or rounded edges. To solve this problem, it is necessary to add a preparatory step of rough milling the flange end face or use complex contour jigs. This not only significantly increases production cycle time, tool wear, and tooling costs, but also reduces product yield and production efficiency. Summary of the Invention

[0005] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0006] This invention provides a die-casting equipment and method for machining automotive engine thermostat housings, which solves the problem in existing technologies that "positioning holes that facilitate subsequent machining cannot be formed on the top of the thermostat housing." The specific solution is as follows: On one hand, the present invention provides a die-casting device for machining a thermostat housing of an automobile engine, including a mold cavity formed by a lower mold and an upper mold. The top of the mold cavity has a sprue that extends to the top of the upper mold. Molten metal is poured into the mold cavity from the sprue and, after cooling, forms a thermostat housing containing a flange. A slag collection bag is formed on the thermostat housing. The inner wall of the mold cavity has a cone block near the upper and / or lower end of the flange, which forms a cone pit at the upper and / or lower end of the flange, facilitating subsequent machining of the mounting holes around the flange.

[0007] Preferably, a bracket is fixed to the top of the upper mold, a base plate is installed at the bottom of the bracket, a hydraulic rod is installed on the base plate, the top of the hydraulic rod is connected to the lower mold, and the lower mold can be moved up and down through the hydraulic rod, so that the lower mold and the upper mold can perform mold opening or closing actions.

[0008] Preferably, sliders are fixed to both ends of the lower mold, and a lifting frame is fixed to the top of the base plate. A sliding groove matching the slider is opened in the middle of the lifting frame. The slider slides into the sliding groove. A rotating groove is opened at the bottom of the sliding groove. When the slider slides to the rotating groove at the bottom of the sliding groove, the lower mold can rotate to one side, and the center of gravity of the lower mold is biased towards the direction of the slider rotation.

[0009] Preferably, the end of the slider is fixedly connected to a limit post, the end of the lifting frame is fixedly connected to a limit frame, a limit groove is opened in the middle of the limit frame, the limit post and the limit groove are slidably connected, the semicircles at the upper and lower ends of the limit groove are concentric with the semicircles at the upper and lower ends of the slide groove, the top end of the hydraulic rod is hinged to the bottom of the lower mold, and the hinge axis is coaxial with the central axis of the limit post.

[0010] Preferably, the bottom of the lower mold has an ejector hole, and an ejector pin is slidably installed in the ejector hole. The bottom of the ejector pin is fixed to the bottom of the lower mold by a spring. A driven gear is fixed to the bottom of the hydraulic rod. The driven gear is rotatably connected to the base plate. A drive block is fixed to the top of the driven gear. When the hydraulic rod drives the lower mold to the lowest position, the limiting pin slides to the bottom of the limiting groove. Under the action of the lower mold's center of gravity shift, the sliders at both ends of the lower mold and the limiting pin rotate around the bottom of the limiting groove, causing the lower mold to begin to tilt. As the tilting proceeds, the ejector pin at the bottom of the lower mold overcomes the spring force and is squeezed into the lower mold by the squeezing action of the drive block, thereby ejecting the thermostat shell inside the lower mold.

[0011] Preferably, a drive gear meshes with one side of the driven gear, and a motor is fixedly mounted on the top of the drive gear. The motor is mounted on the base plate via a frame. The motor drives the drive gear to rotate, which in turn drives the driven gear to rotate, thereby causing the hydraulic rod and the lower mold to rotate, thus adjusting the tilt orientation of the lower mold.

[0012] Preferably, a dust collection cylinder and a spray head are respectively provided at both ends of the upper mold. The dust collection cylinder and the spray head are connected to a dust pump and a spray pump respectively through hoses. The inlet of the spray pump is connected to the mold release agent raw material tank.

[0013] Preferably, the vacuum cleaner is connected to the top of the bracket via a first telescopic member, and the spray head is connected to the top of the bracket via a second telescopic member.

[0014] Preferably, a limiting sleeve is provided on the outside of the ejector pin, and the limiting sleeve is fixed to the bottom of the lower mold. When the spring drives the ejector pin to reset, the limiting sleeve limits the bottom of the ejector pin, so that the top of the ejector pin is flush with the bottom of the inner wall of the mold cavity.

[0015] On the other hand, the present invention provides a die-casting method based on the machining of an automotive engine thermostat housing, comprising the following steps: S1. The lower mold and the upper mold are closed to form a mold cavity for molding the thermostat housing, wherein the inner wall of the mold cavity is provided with a cone block at the upper end and / or lower end of the flange of the thermostat housing to be molded. S2. The molten metal is injected into the mold cavity through the sprue that extends to the top of the upper mold; S3. Hold pressure and cool the molten metal in the mold cavity to solidify it into a thermostat housing casting with a flange. At the same time, use the cone block to form an inwardly recessed cone pit at the corresponding position of the upper and / or lower end of the flange, and make the molten metal solidify at the gating position to form a slag collection bag. S4. Open the mold and remove the thermostat housing casting.

[0016] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: 1. This invention sets a conical block at the corresponding position of the flange on the inner wall of the mold cavity, so that the formed flange forms a conical pit, which provides a precise initial positioning reference for subsequent machining of the installation hole, avoids the hole position deviation caused by the micro-displacement of the thermostat shell, and solves the problem of easy deviation and chipping of the drill bit when starting to drill on a smooth end face or rounded edge. No additional rough milling end face process is required, reducing tool wear and tooling costs.

[0017] 2. This invention utilizes the offset characteristics of the lower mold's center of gravity. When the hydraulic rod drives the lower mold to its lowest position, the slider slides into the rotating groove, causing the lower mold to tilt. The ejector pin is squeezed out of the thermostat housing by the drive block, eliminating the need for manual removal. With the help of springs and limit sleeves, the ejector pin automatically resets, ensuring a smooth inner wall of the mold cavity and improving part removal efficiency and safety.

[0018] 3. This invention features a retractable dust collection cylinder and a spray nozzle, which extend into the mold cavity after the lower mold is tilted. The dust collection cylinder absorbs residual metal slag, and the spray nozzle sprays a release agent, replacing traditional manual cleaning and spraying. This avoids impurities affecting the die-casting quality, while ensuring uniform coverage of the release agent, reducing the risk of mold sticking, and extending the mold life.

[0019] 4. This invention uses a hydraulic rod to drive the lower mold to lift and lower, thus achieving mold opening and closing. The driven gear and the driving gear work together to adjust the tilting direction of the lower mold, adapting to the needs of different workstations such as dust collection, spraying, and part removal. It eliminates the need for frequent fixture changes or equipment layout adjustments, simplifies the operation process, shortens the production cycle, and improves the versatility of the equipment.

[0020] 5. This invention completes a full processing cycle through the linkage of mechanical structure and control system from die casting and cooling to mold opening, material ejection, cleaning and spraying, and then mold resetting and closing. This improves product qualification rate and production efficiency, while reducing preparatory processes and tooling investment, resulting in a significant reduction in overall cost.

[0021] Other features and advantages of the invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings. Attached Figure Description

[0022] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein: Figure 1 This is a perspective view of the entire invention; Figure 2 This is a side view of the present invention; Figure 3 This is a cross-sectional view of the lower mold and the upper mold of the present invention; Figure 4 This is a perspective view of the thermostat housing of the present invention; Figure 5 This is an exploded view of the lower mold and upper mold of the present invention; Figure 6 This is a bottom perspective view of the thermostat housing of the present invention; Figure 7 This is a perspective view of the lower mold and lifting frame of the present invention; Figure 8 This is a perspective view of the lower mold of the present invention in an inclined state; Figure 9 This is a schematic diagram of the rotating groove of the present invention; Figure 10 This is a perspective view of the lower mold, lifting frame, and limiting frame of the present invention; Figure 11 This is a cross-sectional view of the lower mold of the present invention; Figure 12 This is a perspective view of the lower mold and thermostat housing in the ejected state of the present invention; Figure 13 This is a diagram showing the state changes of the lower mold in this invention; Figure 14 This is a perspective view of the spray head of the present invention in operation.

[0023] The accompanying figure is labeled as follows: 1. Lower mold; 2. Upper mold; 3. Mold cavity; 4. Sprue; 5. Thermostat housing; 6. Flange; 7. Slag collection bag; 8. Conical block; 9. Conical pit; 10. Support; 11. Base plate; 12. Hydraulic rod; 13. Slider; 14. Lifting frame; 15. Slide groove; 16. Rotating groove; 17. Limiting post; 18. Limiting frame; 19. Limiting groove; 20. Ejector hole; 21. Ejector post; 22. Spring; 23. Driven gear; 24. Drive block; 25. Limiting sleeve; 26. Drive gear; 27. Motor; 28. Frame; 29. ​​Dust collection cylinder; 30. Spray head; 31. First telescopic component; 32. Second telescopic component. Detailed Implementation

[0024] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of the present invention and, together with the embodiments of the present invention, serve to illustrate the principles of the present invention.

[0025] Example 1: As Figure 1 , Figure 2 , Figure 3 As shown, this embodiment provides a die-casting equipment for processing automotive engine thermostat housings, including a mold cavity 3 formed by a lower mold 1 and an upper mold 2, the top of the mold cavity 3 having a sprue 4, the sprue 4 extending through to the top of the upper mold 2.

[0026] like Figure 4 As shown, molten metal is injected into the mold cavity 3 under high pressure from the sprue 4. After cooling, it forms a thermostat housing 5 containing a flange 6, and a slag collection bag 7 is formed on the thermostat housing 5. The slag collection bag 7 can be removed by subsequent machining (turning). The slag collection bag 7 can serve as a local heat source, improve the temperature field distribution of the mold cavity 3, reduce flow marks, cold shuts, and incomplete pouring, and can play a certain role in backfilling and replenishing when residual metal cools and shrinks.

[0027] like Figure 5 , Figure 6 As shown, the inner wall of the mold cavity 3 has a cone block 8 near the upper and / or lower end of the flange 6, which forms a cone pit 9 at the upper and / or lower end of the flange 6. The cone pit 9 provides a precise initial positioning reference for subsequent machining of the mounting holes of the flange 6, thereby facilitating the machining of the mounting holes around the flange 6.

[0028] like Figure 1 , Figure 2 As shown, a bracket 10 is fixedly connected to the top of the upper mold 2, and a base plate 11 is fixedly installed at the bottom of the bracket 10. A hydraulic rod 12 is installed on the base plate 11, and the top of the hydraulic rod 12 is connected to the lower mold 1. The hydraulic rod 12 can drive the lower mold 1 to move up and down, thereby allowing the lower mold 1 and the upper mold 2 to perform mold opening or closing actions.

[0029] like Figure 7 , Figure 8 , Figure 9 As shown, sliders 13 are fixedly connected to both ends of the lower mold 1, and a lifting frame 14 is fixedly connected to the top of the base plate 11. A sliding groove 15 matching the slider 13 is opened in the middle of the lifting frame 14. The slider 13 is slidably connected to the sliding groove 15. A rotating groove 16 is opened at the bottom of the sliding groove 15. There is a hollow area on one side of the lower mold 1, so the center of gravity of the lower mold 1 is biased towards the direction of slider rotation.

[0030] In the above scheme, since the center of gravity of the lower mold 1 is biased towards the direction of the slider rotation, when the slider 13 slides to the rotation groove 16 at the bottom of the slide groove 15, the lower mold 1 can rotate to one side.

[0031] like Figure 9 , Figure 10 As shown, the end of the slider 13 is fixedly connected to the limiting post 17, the end of the lifting frame 14 is fixedly connected to the limiting frame 18, the middle of the limiting frame 18 is provided with the limiting groove 19, the limiting post 17 and the limiting groove 19 are slidably connected, the semicircles at the upper and lower ends of the limiting groove 19 are concentric with the semicircles at the upper and lower ends of the slide groove 15, the top end of the hydraulic rod 12 is hinged to the bottom of the lower mold 1, and the hinge axis is coaxial with the central axis of the limiting post 17.

[0032] like Figure 11 , Figure 12As shown, the bottom of the lower mold 1 has an ejector hole 20, and an ejector pin 21 is slidably installed in the ejector hole 20. The bottom of the ejector pin 21 is fixed to the bottom of the lower mold 1 by a spring 22. The bottom of the hydraulic rod 12 is fixedly connected to a driven gear 23, which is rotatably connected to the base plate 11. A drive block 24 is fixedly connected to the top of the driven gear 23. When the hydraulic rod 12 drives the lower mold 1 to descend to the lowest position, the limiting pin 17 slides to the bottom of the limiting groove 19. Under the action of the shift of the center of gravity of the lower mold 1, the sliders 13 and the limiting pin 17 at both ends of the lower mold 1 rotate around the bottom of the limiting groove 19, causing the lower mold 1 to begin to tilt. As the tilting proceeds, the ejector pin 21 at the bottom of the lower mold 1 slides into the lower mold 1 under the squeezing action of the drive block 24, overcoming the elastic force of the spring 22, thereby ejecting the thermostat shell 5 that has been cooled and formed inside the lower mold 1.

[0033] It should be noted that, as Figure 13 As shown, the drive block 24 has a decreasing arc surface on the side near the ejector pin 21. As the lower mold 1 rotates, the bottom of the ejector pin 21 can slide in the direction of decreasing arc, thereby allowing the ejector pin 21 to slide into the lower mold 1.

[0034] It should also be noted that, such as Figure 11 As shown, a limiting sleeve 25 is provided on the outside of the ejector pin 21. The limiting sleeve 25 is fixedly connected to the bottom of the lower mold 1. When the spring 22 drives the ejector pin 21 to reset, the limiting sleeve 25 limits the bottom of the ejector pin to prevent the ejector pin 21 from resetting excessively, so that the top of the ejector pin 21 is flush with the bottom of the inner wall of the mold cavity 3.

[0035] The top of the ejector pin 21 can also be slightly lower than the bottom of the inner wall of the mold cavity 3. This allows a slag collection bag to form at the bottom of the thermostat housing 5 during die casting, which can be removed later to prevent the ejector pin 21 from leaving ejector marks on the surface of the thermostat housing 5.

[0036] like Figure 1 As shown, a drive gear 26 meshes with one side of the driven gear 23. A motor 27 is fixedly mounted on the top of the drive gear 26. The motor 27 is mounted on the base plate via a frame 28. The motor 27 drives the drive gear 26 to rotate, and the drive gear 26 drives the driven gear 23 to rotate, thereby causing the hydraulic rod 12 and the lower mold 1 to rotate, thereby adjusting the tilt orientation of the lower mold 1.

[0037] The upper mold 2 is equipped with a dust suction cylinder 29 and a spray head 30 at both ends. The dust suction cylinder 29 and the spray head 30 are connected to a dust suction pump and a spray pump (not shown in the figure) respectively through hoses. The inlet of the spray pump is connected to the release agent raw material tank.

[0038] like Figure 14As shown, the vacuum cleaner 29 is connected to the top of the bracket via the first telescopic member 31, and the spray head 30 is connected to the top of the bracket 10 via the second telescopic member 32.

[0039] In the above scheme, when the lower mold 1 descends and is neither facing the dust collection cylinder 29 nor the spray head 30, the ejector column 21 in the above scheme can eject the formed thermostat shell 5, and then remove it through the clamp. When the lower mold 1 faces the dust collection cylinder 29, the first telescopic member 31 drives the dust collection cylinder 29 to extend into the mold cavity 3 to absorb the residual metal slag in the mold cavity 3. Then the lower mold 1 switches its orientation to face the spray head 30, and the second telescopic member 32 drives the spray head 30 to extend into the mold cavity 3. Then the spray pump... The release agent is pumped into the spray nozzle 30 and sprayed onto the inner wall of the mold cavity 3 in a diffused mist. Then, the lower mold 1 is rotated to the default angle and driven to rise by the hydraulic rod 12. Through the transition area between the rotating groove 16 and the slide groove 15, the slider 13 is caused to rotate and slide into the slide groove 15. Then, the lower mold 1 and the upper mold 2 are closed by the hydraulic rod 12. Finally, the molten metal is injected into the mold cavity 3 from the sprue 4 under pressure and then cooled and formed, thus completing the processing cycle of a thermostat shell 5.

[0040] Example 2: The technical solution of this example differs from that of Example 1 in that this example provides the following steps: S1. Initial state and mold closing action: The upper mold 2 is fixed relative to the ground / frame, the bracket 10 is fixed on the top of the upper mold 2, the base plate 11 is installed on the bottom of the bracket 10, and the hydraulic rod 12 is installed on the base plate 11, with its top connected to the lower mold 1.

[0041] When the mold is closed, the hydraulic rod 12 extends and pushes the lower mold 1 upward as a whole; the sliders 13 at both ends of the lower mold 1 slide linearly within the slide groove 15 of the lifting frame 14 to ensure that the lower mold 1 does not wobble or rotate until the upper parting surface of the lower mold 1 is attached to and locked with the lower parting surface of the upper mold 2 to form a closed mold cavity 3.

[0042] S2, High-pressure die casting filling and cooling molding: The molten metal enters the sprue 4 from the external injection / gating system and is injected into the mold cavity 3 under high pressure through the sprue 4; the molten metal cools and solidifies after filling the cavity.

[0043] Because the inner wall of the mold cavity 3 is provided with cone blocks 8 near the upper and / or lower ends of the flange 6, a cone pit 9 is formed at the corresponding position of the solidified thermostat shell 5.

[0044] The final casting shape is: thermostat shell 5 + slag collection bag 7 connected to the gating / overflow + conical pit 9 on the edge of flange 6.

[0045] S3, Mold Opening and Lowering: The hydraulic rod 12 retracts, pulling the lower mold 1 downwards as a whole.

[0046] During the downward movement of the lower mold 1, the slider 13 still maintains its posture in the vertical section of the slide groove 15: it does not flip or rotate, but only performs translational separation, so that the parting surface opens, and the thermostat housing 5 remains on one side of the lower mold 1 due to the "shrinkage clamping force / adhesion force".

[0047] S4, Enter the rotating slot 16: When slider 13 continues to descend to the bottom of slide groove 15 and connects with rotating groove 16: The "sidewall guide" of chute 15 disappears / gives up here; Because there is a "hollow area" on one side of the lower mold 1, the overall center of gravity is biased towards the direction of the slider rotation. Under the action of its own weight eccentricity moment, the lower mold 1 no longer maintains a vertical posture, but begins to tilt to one side with the center of the arc of the rotating groove 16 as the swing center.

[0048] At the same time, the limiting post 17 enters the limiting groove 19 of the limiting frame 18: The semicircles at the upper and lower ends of the limiting groove 19 are concentric with the semicircles at the upper and lower ends of the slide groove 15; and the hinge axis between the top of the hydraulic rod 12 and the lower mold 1 is coaxial with the central axis of the limiting post 17.

[0049] S5. Complete the "top material" process during tilting: A drive block 24 is fixedly connected to the top of the driven gear 23, and the bottom of the ejector pin 21 in the ejector hole 20 is elastically connected to the bottom of the lower mold 1 by a spring 22; the outer ring of the ejector pin 21 is also fixed to the bottom of the lower mold 1 by a limit sleeve 25 to limit the upper limit of the rebound and ensure that the top surface of the ejector pin 21 is flush with the bottom surface of the mold cavity 3 after reset.

[0050] When the hydraulic rod 12 lowers the lower mold 1 to its lowest position and the lower mold 1 begins to tilt and rotate: The bottom end face of the ejector pin 21 will slide against the surface of the drive block 24, thereby pushing the ejector pin 21 into the lower mold 1, and thus pushing out the thermostat housing 5.

[0051] When the lower mold 1 rises and disengages from the drive block 24, the spring 22 pulls the ejector pin 21 back, the limit sleeve 25 stops the over-extension, and restores the state of "the top surface is flush with the cavity", which does not affect the next mold closing and filling.

[0052] S6. Adjust the tilt orientation of the lower mold 1: Driven gear 23 is rotatably connected to base plate 11, drive gear 26 meshes with driven gear 23, and drive gear 26 is driven by motor 27 through frame 28.

[0053] Motor 27 → Drive gear 26 → Driven gear 23 → Drive hydraulic rod 12 and lower mold 1 to rotate together around the vertical axis, thereby changing the "inclined opening orientation" of lower mold 1.

[0054] The two processing bits are: Dust collection cylinder 29 side: The dust collection cylinder 29 is sent into the mold cavity 3 area through the first telescopic member 31, and the external dust collection pump sucks away the debris / dust left over from the previous die casting. Spray head 30 side: The spray head 30 is sent into the mold cavity 3 area through the second telescopic member 32, and the spray pump atomizes the release agent and sprays it onto the inner wall of the mold cavity 3 to ensure that the next mold does not stick and the demolding is smooth.

[0055] S7, Reset: After cleaning / spraying is completed, motor 27 rotates lower mold 1 to the "default center position" and hydraulic rod 12 extends to lift lower mold 1. The slider 13 climbs back up the transition area of ​​the "vertical section of the slide groove 15" along the arc segment of the rotating groove 16. The lower mold 1 is straightened from the tilted posture and restored to vertical translation guidance until it closes with the upper mold 2 to form the mold cavity 3. Then, molten metal is injected to complete one cycle.

[0056] In summary, this invention provides a precise initial positioning reference for subsequent machining of mounting holes by setting a conical block 8 at the corresponding position of the flange 6 on the inner wall of the mold cavity 3, so that the formed flange 6 forms a conical pit 9. This avoids hole position deviation caused by the micro-displacement of the thermostat housing 5. At the same time, it solves the problem of easy deviation and chipping of the drill bit when starting drilling on smooth end faces or rounded edges, eliminating the need for additional rough milling end face processes, reducing tool wear and tooling costs. By utilizing the center of gravity offset characteristics of the lower mold 1, when the hydraulic rod 12 drives the lower mold 1 to the lowest position, the slider 13 slides into the rotating groove 16 to tilt the lower mold 1. The ejector column 21 is squeezed out of the thermostat housing 5 by the driving block 24, eliminating the need for manual removal. With the help of the spring 22 and the limiting sleeve 25, the ejector column 21 is automatically reset, ensuring the flatness of the inner wall of the mold cavity 3, improving the removal efficiency and safety. By setting a retractable dust suction cylinder 29 and a spray head 30, the lower mold can be cleaned and sprayed. After tilting, the nozzles 29 and 30 extend into the mold cavity 3 to absorb residual metal slag and spray release agent, respectively. This replaces traditional manual cleaning and spraying, avoiding impurities from affecting the die-casting quality and ensuring uniform coverage of the release agent, reducing the risk of mold sticking and extending mold life. The lower mold 1 is lifted and lowered by the hydraulic rod 12 to achieve mold opening and closing. The driven gear 23 and the drive gear 26 work together to adjust the tilting direction of the lower mold 1, adapting to the needs of different workstations such as dust collection, spraying, and part removal. There is no need to frequently change fixtures or adjust the equipment layout, simplifying the operation process, shortening the production cycle, and improving the versatility of the equipment. From mold closing and die casting to cooling and forming, mold opening and ejection, cleaning and spraying, and then resetting and closing the mold, each link is linked by the mechanical structure and control system to complete the complete processing cycle, improving the product qualification rate and production efficiency, while reducing preparatory processes and tooling investment, and significantly reducing the overall cost.

[0057] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0058] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the present application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0059] The devices or elements referred to in the embodiments of this application or implied herein must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as limiting the embodiments of this application. In the description of the embodiments of this application, "a plurality of" means two or more, unless otherwise precisely specified.

[0060] The preferred embodiments of the present invention disclosed above are merely illustrative of the invention. These preferred embodiments do not exhaustively describe all details, nor do they limit the invention to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of the invention, thereby enabling those skilled in the art to better understand and utilize the invention. The invention is limited only by the claims and their full scope and equivalents.

Claims

1. A die-casting equipment for machining automotive engine thermostat housings, comprising a mold cavity formed by a lower mold and an upper mold, characterized in that: The top of the mold cavity has a sprue that extends to the top of the upper mold. Molten metal is poured into the mold cavity from the sprue and, after cooling, forms a thermostat housing containing a flange. A slag collection bag is formed on the thermostat housing. The inner wall of the mold cavity has a cone near the upper and / or lower end of the flange, which forms a cone pit at the upper and / or lower end of the flange, facilitating subsequent machining of the mounting holes around the flange.

2. The die-casting equipment based on the machining of an automotive engine thermostat housing as described in claim 1, characterized in that: The top of the upper mold is fixed to a bracket, the bottom of the bracket is mounted on a base plate, and a hydraulic rod is mounted on the base plate. The top of the hydraulic rod is connected to the lower mold, and the hydraulic rod can drive the lower mold to move up and down, thereby allowing the lower mold and the upper mold to perform mold opening or closing actions.

3. The die-casting equipment based on the machining of an automobile engine thermostat housing as described in claim 2, characterized in that: The lower mold has sliders fixed at both ends, and a lifting frame is fixed at the top of the base plate. The middle of the lifting frame has a groove that matches the slider. The slider slides into the groove. A rotating groove is provided at the bottom of the groove. When the slider slides to the rotating groove at the bottom of the groove, the lower mold can rotate to one side, and the center of gravity of the lower mold is biased towards the direction of the slider's rotation.

4. The die-casting equipment based on the machining of an automotive engine thermostat housing as described in claim 3, characterized in that: The end of the slider is fixedly connected to a limit post, the end of the lifting frame is fixedly connected to a limit frame, the middle of the limit frame is provided with a limit groove, the limit post and the limit groove are slidably connected, the semicircles at the upper and lower ends of the limit groove are concentric with the semicircles at the upper and lower ends of the slide groove, the top of the hydraulic rod is hinged to the bottom of the lower mold, and the hinge axis is coaxial with the central axis of the limit post.

5. The die-casting equipment based on the machining of an automobile engine thermostat housing as described in claim 4, characterized in that: The bottom of the lower mold has an ejector hole, in which an ejector pin is slidably installed. The bottom of the ejector pin is fixed to the bottom of the lower mold by a spring. The bottom of the hydraulic rod is fixed to a driven gear, which is rotatably connected to the base plate. A drive block is fixed to the top of the driven gear. When the hydraulic rod drives the lower mold to its lowest position, the limit pin slides to the bottom of the limit groove. Under the action of the lower mold's center of gravity shift, the sliders and limit pins at both ends of the lower mold rotate around the bottom of the limit groove, causing the lower mold to begin to tilt. As the tilting continues, the ejector pin at the bottom of the lower mold overcomes the spring force and is squeezed into the lower mold by the squeezing action of the drive block, thereby ejecting the thermostat housing inside the lower mold.

6. The die-casting equipment based on the machining of an automobile engine thermostat housing as described in claim 5, characterized in that: A drive gear meshes with one side of the driven gear. A motor is fixedly mounted on the top of the drive gear. The motor is mounted on the base plate via a frame. The motor drives the drive gear to rotate, which in turn drives the driven gear to rotate, thereby causing the hydraulic rod and the lower mold to rotate, thus adjusting the tilt orientation of the lower mold.

7. The die-casting equipment based on the machining of an automobile engine thermostat housing as described in claim 5, characterized in that: The upper mold is equipped with a dust collection cylinder and a spray nozzle at both ends. The dust collection cylinder and the spray nozzle are connected to the dust pump and the spray pump respectively via hoses. The inlet of the spray pump is connected to the mold release agent raw material tank.

8. The die-casting equipment based on the machining of an automobile engine thermostat housing as described in claim 7, characterized in that: The vacuum cleaner canister is connected to the top of the bracket via a first telescopic component, and the spray nozzle is connected to the top of the bracket via a second telescopic component.

9. The die-casting equipment based on the machining of an automobile engine thermostat housing as described in claim 5, characterized in that: The ejector pin is provided with a limiting sleeve on its outside. The limiting sleeve is fixed to the bottom of the lower mold, and the ejector pin is slidably connected to the limiting sleeve.

10. A die-casting method for machining an automotive engine thermostat housing, employing the die-casting equipment described in any one of claims 1-9, characterized in that... Includes the following steps: S1. The lower mold and the upper mold are closed to form a mold cavity for molding the thermostat housing, wherein the inner wall of the mold cavity is provided with a cone block at the upper end and / or lower end of the flange of the thermostat housing to be molded. S2. The molten metal is injected into the mold cavity through the sprue that extends to the top of the upper mold; S3. Hold pressure and cool the molten metal in the mold cavity to solidify it into a thermostat housing casting with a flange. At the same time, use the cone block to form an inwardly recessed cone pit at the corresponding position of the upper and / or lower end of the flange, and make the molten metal solidify at the gating position to form a slag collection bag. S4. Open the mold and remove the thermostat housing casting.

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