Die-casting die for left and right D columns of automobile

Abstract

The invention relates to the technical field of die-casting dies, and discloses a die-casting die for left and right D columns of an automobile. A left cavity and a right cavity of a die cavity each comprise a straight wall module, an upper folding wall module and an outer convex wall module on a movable die core, and the straight wall modules, the upper folding wall modules and the outer convex wall modules intersect to form a three-branch shape; the inner edges of the straight wall module and the upper folding wall module are connected to form an obtuse-angle long edge, and a mold sprue is connected with the obtuse-angle long edge through a sub-runner; a first vacuum valve communicated with the outer edge of the upper folding wall module, a second vacuum valve communicated with the outer edge of the straight wall module and a vacuum exhaust block structure communicated with the edge of the outer convex wall module are arranged on the movable mold core. According to the automobile left and right D column die-casting die, obtuse-angle long-side feeding is adopted, compared with traditional short-side feeding, the flowing path of molten aluminum in a thin-wall structure D column special-shaped piece cavity is greatly shortened, the filling time of all areas is more uniform, and the product forming quality is remarkably improved.

Description

Technical Field

[0001] The invention relates to the technical field of die casting dies, in particular to a die casting die for left and right D-pillars of an automobile. Background Art

[0002] In the field of automobile manufacturing, the die-casting process of automobile body structural parts has received increasing attention. The left and right D-pillars of automobiles are important supporting and connecting parts of the automobile body. Their quality and performance directly affect the safety and stability of the entire vehicle. With the advancement of the lightweight design concept of automobiles, D-pillars are mostly designed as special-shaped parts with thin-walled structures, which puts higher requirements on the research and development of die-casting molds.

[0003] The structure of the left and right D-pillars of the car is shown in Figure 3 As shown, the left D-pillar 41 and the right D-pillar 42 of the automobile are symmetrical structures, both including a straight wall section 421, an upper folded wall section 422 and an outer convex wall section 423. The straight wall section 421, the upper folded wall section 422 and the outer convex wall section 423 intersect to form a trifurcated shape. Assuming that the edge formed by the outer convex wall section 423 and the edge of the straight arm section 421 is connected to form an L-shaped edge 425, and the edge formed by the upper folded wall section 422 and the edge of the straight wall section 421 is connected to form an obtuse angle edge 424, the length of the L-shaped edge 425 is significantly shorter than the obtuse angle edge 424. When designing the left and right D-pillar molds of the automobile, the traditional die-casting mold scheme often adopts the method of short-side feeding and flat gate. This design has certain advantages in the construction of the mold structure. Its structure is relatively simple, easy to process and manufacture, and easy to assemble and debug the mold, which can reduce the initial R&D cost and production cycle of the mold. However, this scheme has exposed many problems in the actual application process. Due to the use of short-side feeding, the flow path of the molten metal in the mold cavity is relatively long, especially for the thin-walled D-pillar special-shaped parts, the molten metal will face greater resistance and heat loss during the filling process at the far end. This leads to a decrease in the flow rate of the molten metal in the far-end area and a significant drop in temperature, which makes the product prone to defects such as undercasting and cold shut in the far-end part, seriously affecting the molding quality of the product. Moreover, due to insufficient shrinkage compensation during the solidification process of the molten metal, the far-end area is prone to internal defects such as shrinkage cavities and shrinkage, which has a great negative impact on the mechanical properties of the product, such as reducing its key performance indicators such as strength and toughness, and it is difficult to meet the performance requirements of high strength and high reliability of the D-pillar during actual driving of the car. Therefore, in order to overcome the shortcomings of the existing mold solutions, it is urgent to develop a new die-casting mold for the left and right D-pillars of automobiles. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a die-casting mold for the left and right D-pillars of an automobile, aiming to ensure that the D-pillar castings have good molding quality and stable performance within the entire structural range, and meet the needs of the modern automobile industry for high-quality body structural parts.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A die-casting mold for left and right D-pillars of an automobile comprises a fixed mold frame, a movable mold frame, a square iron and a movable mold bottom plate which are arranged in sequence from front to back, a fixed mold core is arranged on the fixed mold frame, a movable mold core is arranged on the movable mold frame, the fixed mold core and the movable mold core are combined to form a mold cavity, the mold cavity comprises a left cavity and a right cavity which are arranged symmetrically on the left and right, a mold gate is arranged between the left cavity and the right cavity, the left cavity and the right cavity both comprise a straight wall module, an upper folded wall module and an outer convex wall module on the movable mold core, the straight wall module, the upper folded wall module and the outer convex wall module intersect into a three-fork shape, the inner edges of the straight wall module and the upper folded wall module are connected to form an obtuse long side, the mold gate is connected to the obtuse long side through a diverter, the movable mold core is provided with a first vacuum valve which is communicated with the outer edge of the upper folded wall module, a second vacuum valve which is communicated with the outer edge of the straight wall module, and a vacuum exhaust block structure which is communicated with the edge of the outer convex wall module.

[0007] As a further improvement of the above technical solution, the first vacuum valve and the second vacuum valve each include a vacuum filter, a vacuum insert arranged on the cavity of the moving mold core, a pull rod axially passing through the vacuum insert and controlling the opening and closing of the vacuum port, and an oil cylinder driven by the pull rod, and the vacuum insert is connected to the vacuum generating device of the die-casting machine through the vacuum filter.

[0008] As a further improvement of the above technical solution, a notch for installing the oil cylinder is provided on the side of the movable mold frame, and two guide slides that are spaced apart and extend forward and backward are fixed on the inner top surface of the notch. A plug plate that can slide with the two guide slides is provided on the top of the oil cylinder, and a threaded hole is provided on the front end surface of each of the guide slides, and through holes that are the same number and correspond one to one with the threaded holes are provided on the front end surface of the plug plate, and a screw is inserted into each through hole to connect it with the corresponding threaded hole.

[0009] As a further improvement of the above technical solution, the cylinder includes a cylinder body and a top plate arranged on the cylinder body, the piston rod of the cylinder body is connected to the pull rod through a coupling, two flat grooves are provided on the side wall of the end of the pull rod connected to the coupling, the side wall on the coupling is provided with a snap-in mounting opening that engages with the flat groove of the pull rod, and the top plate is provided with an avoidance opening corresponding to the snap-in mounting opening.

[0010] As a further improvement of the above technical solution, a radial positioning block is provided on the top plate, and a radial positioning groove matching the radial positioning block is provided on the side wall of the coupling. The plug plate includes a flat plate body and a limit strip provided on the front end surface of the flat plate body and extending laterally. The flat plate body and the limit strip are combined to form a T-shaped structure, and a through hole is provided on each of the two ends of the limit strip. The flat plate body is fixed to the top plate by screws and is provided with a through hole for the coupling to move.

[0011] As a further improvement of the above technical solution, the limiting strip of the plug board is connected to an outwardly extending extension rod, and one end of the extension rod away from the plug board is connected to the handle.

[0012] As a further improvement of the above technical solution, the vacuum exhaust block structure includes a vacuum filter and an exhaust block. The exhaust block is provided with a wave groove and an exhaust hole connected to the wave groove. The exhaust hole cooperates with the exhaust pin to form an exhaust gap. The exhaust block is connected to the vacuum generating device of the die-casting machine through the vacuum filter.

[0013] As a further improvement of the above technical solution, a pressure plate located behind the fixed mold core is fixed on the fixed mold frame, and an ejector mounting plate and an ejector push plate are provided between the pressure plate and the fixed mold core. The fixed mold core is penetrated by multiple ejectors and return rods, and one end of the return rod is connected to a pop-up assembly. The ejector mounting plate and the ejector push plate clamp the ejector and the pop-up assembly by splicing them front and back. Multiple pop-up assemblies and return rods are distributed at the corners of the ejector mounting plate, and the pop-up assembly provides a force for the ejector mounting plate, the ejector push plate, the ejector and the return rod to move toward the mold cavity.

[0014] As a further improvement of the above technical solution, the pop-up assembly includes a sleeve with a closed end, a bolt, a spring, a pressure sleeve and a limit ring. The tail end of the bolt is threadedly connected to the limit ring. The spring and the pressure sleeve can be movably mounted on the bolt. The head of the bolt limits the pressure sleeve from detaching from the bolt. The pressure sleeve can drive the spring to compress toward the limit ring, and the spring can release the elastic force to press the pressure sleeve toward the pressure plate.

[0015] As a further improvement of the above technical solution, a positioning outer ring is provided on the open end of the sleeve for clamping the ejector mounting plate and the ejector push plate, and one end of the return rod is fixed to the closed end of the sleeve by a fixing ring and a screw.

[0016] Beneficial effects of the present invention: Compared with the prior art, the left and right D-pillar die-casting molds for automobiles provided by the present invention adopt obtuse-angle long-side feeding, which greatly shortens the flow path of molten aluminum in the cavity of thin-walled D-pillar special-shaped parts compared to traditional short-side feeding, making the filling time of each area more uniform, and effectively solving the problems of reduced flow rate of molten metal at the far end and obvious temperature drop caused by the long flow path, avoiding defects such as under-casting and cold shut at the far end of the product, and significantly improving the product molding quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the structure of the left cavity and the right cavity on the moving mold core in the die-casting mold of the left and right D-pillars of the automobile.

[0018] Figure 2 It is a three-dimensional image of the left and right D-pillar castings of the car.

[0019] Figure 3 It is a schematic diagram of the structure of the left D-pillar and the right D-pillar of a car.

[0020] Figure 4 This is a three-dimensional image of the die-casting molds for the left and right D-pillars of a car.

[0021] Figure 5 Schematic diagram of the structure of the first vacuum valve.

[0022] Figure 6 This is an exploded view of the first vacuum valve.

[0023] Figure 7 It is a schematic diagram of the structure of the oil cylinder of the first vacuum valve.

[0024] Figure 8 A three-dimensional diagram of the fixed mold ejection structure provided by the present invention.

[0025] Fig. 9 A perspective view of the connection between the ejection assembly and the return rod.

[0026] Fig.10 A cross-sectional view of the ejection assembly connected to the return rod.

[0027] Fig.11 This is a schematic diagram of the coordination between the fixed mold ejection structure and the fixed mold core.

[0028] Main component symbol description: 11-fixed mold frame, 12-fixed mold core, 2-movable mold frame, 21-notch, 31-square iron, 32-movable mold bottom plate, 4-casting, 41-automobile left D-pillar, 42-automobile right D-pillar, 421-straight wall section, 422-upper folded wall section, 423-convex wall section, 424-obtuse angle edge, 425-L-shaped edge, 43-diverter slag bag, 44-exhaust slag bag, 5-movable mold core, 50-mold gate, 51-diverter channel, 52-left cavity, 53-right cavity, 531-straight wall module, 532-upper folded wall module, 533-convex wall module, 534-obtuse angle long edge, 6-first vacuum valve, 61-vacuum insert, 62-pull rod, 621-flat cut groove, 63-oil cylinder, 631-oil cylinder body, 632 -top plate, 6321-avoidance port, 633-coupling, 6331-clamping mounting port, 6332-radial positioning groove, 634-radial positioning block, 65-guide slide bar, 651-threaded hole, 66-insert plate, 661-flat plate, 662-limiting strip, 663-through hole, 664-through port, 67-screw, 681-extension rod, 682-handle, 69-vacuum filter, 7-second vacuum valve, 8-vacuum exhaust block structure, 93-pressing plate, 94-thimble mounting plate, 95-thimble push plate, 96-return rod, 97-thimble, 98-ejection assembly, 981-sleeve, 9810-positioning outer ring, 982-bolt, 983-spring, 984-pressing sleeve, 985-limiting ring, 986-fixing ring. DETAILED DESCRIPTION

[0029] The present invention provides a die-casting mold for left and right D-pillars of an automobile. In order to make the purpose, technical solution and effect of the present invention clearer and more specific, the present invention is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the scope of protection of the present invention.

[0030] See also Figure 1 and Figure 4The present invention provides a die-casting mold for left and right D-pillars of an automobile, comprising a fixed mold frame 11, a movable mold frame 2, a square iron 31 and a movable mold bottom plate 32 arranged in sequence from front to back, the fixed mold frame 11 is provided with a fixed mold core 12, the movable mold frame 2 is provided with a movable mold core 5, the fixed mold core 12 and the movable mold core 5 are combined to form a mold cavity, the mold cavity comprises a left mold cavity 52 and a right mold cavity 53 arranged symmetrically on the left and right, a mold gate 50 is arranged between the left mold cavity 52 and the right mold cavity 53, the left mold cavity 52 and the right mold cavity 53 both comprise a straight wall module 531 and an upper folding wall module on the movable mold core 5 532 and an outer convex wall module 533, the straight wall module 531, the upper folded wall module 532 and the outer convex wall module 533 intersect into a trifurcated shape, the inner edges of the straight wall module 531 and the upper folded wall module 532 are connected to form an obtuse-angled long side 534, the mold gate 50 is connected to the obtuse-angled long side 534 through a branch channel 51, and the movable mold core 5 is provided with a first vacuum valve 6 connected to the outer edge of the upper folded wall module 532, a second vacuum valve 7 connected to the outer edge of the straight wall module 531, and a vacuum exhaust block structure 8 connected to the edge of the outer convex wall module 533.

[0031] The aluminum liquid is injected from the mold gate 50 and flows to the obtuse long side 534 with the left cavity 52 and the right cavity 53 through the branch channel 51. Since the obtuse long side 534 is formed by connecting the inner edge of the straight wall module 531 and the upper folded wall module 532, the aluminum liquid can be evenly diffused to various areas inside the cavity along this long side, shortening the flow path of the aluminum liquid and reducing the pressure and heat loss caused by the long flow path. In the initial stage of filling, the aluminum liquid quickly enters the cavity under the action of pressure. At this time, the first vacuum valve 6 and the second vacuum valve 7 are in an open state, and work together with the vacuum exhaust block at the edge of the outer convex wall module 533 to extract the air in the cavity, reduce the air pressure in the cavity, and promote the aluminum liquid to fill the cavity quickly and stably. When the aluminum liquid reaches the vicinity of the inner gate area, the first vacuum valve 6 and the second vacuum valve 7 are closed to prevent the aluminum liquid from backflowing, but in the subsequent low-speed casting stage of the runner, they will be opened again to assist the aluminum liquid to further fill the fine parts of the cavity and exhaust the gas. The vacuum exhaust block works continuously during the whole process, constantly extracting the gas and possible impurities in the cavity, ensuring that the aluminum liquid can fully fill every corner in the cavity, especially ensuring the good filling effect of the outer convex wall module 533 and other areas, reducing defects caused by gas residue, and also facilitating the shrinkage compensation of the molten metal during its solidification process, avoiding shrinkage cavities, shrinkage porosity and other problems, and finally making the product obtain good molding quality and high mechanical properties.

[0032] See Figure 2As shown, the left and right D-pillar castings 4 of the automobile are special-shaped parts. According to the structure of the cavity, the structure of the casting 4 includes the left D-pillar 41 of the automobile, the right D-pillar 42 of the automobile, the slag bag of the runner 51 and the exhaust slag bag 44. The left and right D-pillar castings 4 of the automobile mostly adopt a thin-walled structure. This thin-wall design can not only effectively reduce the overall weight of the automobile, but also improve fuel economy and vehicle handling performance while ensuring strength and stability. However, the thin-walled structure also puts higher requirements on the die-casting process, and the filling process of the molten metal needs to be accurately controlled to avoid defects such as undercasting and cold shut.

[0033] Compared with the prior art, the automobile left and right D-pillar die-casting mold provided by the present invention adopts the obtuse long side 534 feeding, which greatly shortens the flow path of the aluminum liquid in the thin-walled D-pillar special-shaped part cavity compared to the traditional short side feeding, making the filling time of each area more uniform, and effectively solving the problems of reduced flow rate of the far end metal liquid and obvious temperature drop caused by the long flow path, avoiding defects such as under-casting and cold shut at the far end of the product, and significantly improving the product molding quality.

[0034] In addition, the unique vacuum slag removal design, through the cooperation of the vacuum valve near the gate and the vacuum exhaust block at the end of the gate, improves the vacuum degree inside the cavity and enhances the filling capacity of the aluminum liquid. It effectively solves the problem of internal defects such as shrinkage cavities and shrinkage in the distal area due to insufficient shrinkage compensation during the solidification of the molten metal, improves the mechanical properties of the product, such as key indicators such as strength and toughness, and meets the automobile's requirements for high strength and high reliability of the D-pillar.

[0035] For details, see 4 to Figure 7 As shown, the first vacuum valve 6 and the second vacuum valve 7 both include a vacuum filter 69, a vacuum insert 61 arranged on the cavity of the movable mold core 5, a pull rod 62 axially passing through the vacuum insert 61 and controlling the opening and closing of the air extraction port, and an oil cylinder 63 for driving and connecting with the pull rod 62. The vacuum insert 61 is connected to the vacuum generating device of the die casting machine through the vacuum filter 69. In the early stage of filling, the pull rod 62 controls the air extraction port of the vacuum insert 61 to be in an open state. Under the action of the vacuum generating device of the die casting machine, the air in the cavity is successively extracted through the vacuum insert 61 and the vacuum filter 69, reducing the internal air pressure of the cavity, creating favorable conditions for the smooth filling of the aluminum liquid, so that the aluminum liquid can fill various parts of the cavity more quickly and evenly, and reduce gas inclusions. When the aluminum liquid reaches a specific position (such as near the area of ​​the diverter 51), the oil cylinder 63 drives the pull rod 62 again to close the air extraction port to prevent the aluminum liquid from flowing back into the air extraction channel. During the low-speed casting stage of the runner, the oil cylinder 63 can drive the pull rod 62 again according to the setting to open the exhaust port, so as to assist in completing the gas treatment related to cavity exhaust and shrinkage compensation during the remaining casting process.

[0036] During the die-casting process, the oil cylinder 63 is a component that drives the pull rod 62 to move, and its operating frequency is relatively high. After long-term use, the seal inside the oil cylinder 63 may wear and age, causing the oil cylinder 63 to leak and other faults. The traditional oil cylinder 63 is usually fixed by a large number of bolts 982. The distribution position of these bolts 982 may be relatively complex, and some may be located in a small space inside the mold and are difficult to reach. During disassembly, special tools are required, and a lot of time is spent to unscrew the bolts 982 one by one, which increases the difficulty of disassembly. Therefore, the present invention provides a quick-release structure of the oil cylinder 63.

[0037] The quick-release structure of the oil cylinder 63 is specifically as follows: a notch 21 for installing the oil cylinder 63 is provided on the side of the movable mold frame 2, and two guide slides 65 arranged at intervals and extending forward and backward are fixedly provided on the inner top surface of the notch 21. A plug plate 66 that can slidably cooperate with the two guide slides 65 is provided on the top of the oil cylinder 63, and a threaded hole 651 is provided on the front end surface of each of the guide slides 65. The front end surface of the plug plate 66 is provided with through holes 663 that are the same in number and one-to-one corresponding to the threaded holes 651, and a screw 67 is inserted into each through hole 663 to connect with the corresponding threaded hole 651.

[0038] When the oil cylinder 63 needs to be installed, the insert plate 66 is inserted along the guide slide 65, the through hole 663 on the insert plate 66 is aligned with the threaded hole 651 on the front end surface of the guide slide 65, and then the screw 67 is inserted to connect, so that the oil cylinder 63 is fixed to the notch 21 of the movable mold frame 2. When the oil cylinder 63 needs to be removed, it is only necessary to unscrew the screw 67 and then slide the oil cylinder 63 out along the guide slide 65.

[0039] Unlike the traditional fixing method that uses a large number of bolts 982 and is in a complex and difficult to reach position, this oil cylinder 63 quick-release structure, through the cooperation of the guide slide 65 and the plug plate 66, only needs to unscrew a small number of screws 67 to pull the entire oil cylinder 63 outward, greatly reducing the steps and time of disassembly. For the oil cylinder 63 in a complex position such as a small space inside the mold, this method avoids the trouble of using special tools to unscrew a large number of screws 67 one by one, making the disassembly work more convenient, and then the faulty oil cylinder 63 can be repaired or replaced in time, which helps to reduce production delays caused by oil cylinder 63 failure, ensure the normal progress of die-casting production, and improve production efficiency.

[0040] Furthermore, the oil cylinder 63 includes an oil cylinder body 631 and a top plate 632 disposed on the oil cylinder body 631. The piston rod of the oil cylinder body 631 is connected to the pull rod 62 through a coupling 633, which can achieve relatively accurate power transmission. During the die-casting process, the oil cylinder 63 drives the pull rod 62 to move to control the opening and closing of the air extraction port. This connection method can accurately convert the telescopic action of the oil cylinder 63 into the corresponding action of the pull rod 62, ensuring the accuracy of the opening and closing of the air extraction port, thereby better controlling the vacuuming process of the mold cavity. The oil inlet and outlet joints on the oil cylinder body 631 are used to connect the oil circuit to control the piston rod of the oil cylinder 63 to lift and pull back to control the vacuuming time.

[0041] In fact, two flat grooves 621 are provided on the side wall of the end portion of the pull rod 62 connected to the coupling 633, a snap-fit ​​installation opening 6331 is provided on the side wall of the coupling 633 to be engaged with the flat groove 621 of the pull rod 62, and a avoidance opening 6321 corresponding to the snap-fit ​​installation opening 6331 is provided on the top plate 632; the two flat grooves 621 on the side wall of the end portion of the pull rod 62 are engaged with the snap-fit ​​installation opening 6331 on the side wall of the coupling 633, and this design provides a precise positioning method for the connection between the pull rod 62 and the coupling 633. During the installation process, the operator can easily align the pull rod 62 with the coupling 633 so that the flat groove 621 is accurately embedded in the snap-fit ​​installation opening 6331, without the need for a complicated adjustment process, thereby speeding up the installation speed, improving the assembly efficiency, and reducing human errors during the installation process. The connected pull rod 62 and coupling 633 are stable and reliable, which ensures the stability of power transmission and ensures that the pull rod 62 can accurately control the opening and closing of the vacuum port of the vacuum insert 61 to maintain the normal operation of the vacuum valve.

[0042] When the oil cylinder 63 needs to be disassembled, the oil cylinder 63 is pulled forward. Since the coupling 633 is engaged with the pull rod 62 through the flat cut groove 621 and the clamping installation opening 6331, a clearance opening 6321 corresponding to the clamping installation opening 6331 is provided on the top plate 632, so that the coupling 633 can be smoothly separated from the pull rod 62 during the process of pulling the oil cylinder 63 forward. This design greatly simplifies the disassembly process, does not require the use of complex tools or cumbersome operations, and saves disassembly time and labor costs.

[0043] The top plate 632 is provided with a radial positioning block 634, and the side wall of the coupling 633 is provided with a radial positioning groove 6332 matched with the radial positioning block 634. Through such a configuration, on the one hand, the coupling 633 can be accurately positioned and installed to ensure that the clamping installation opening 6331 on the coupling 633 is aligned with the pull rod 62 toward the rear, and on the other hand, the radial positioning block 634 can guide the coupling 633 to move in a straight line to avoid deflection that affects the opening and closing performance of the pull rod 62.

[0044] Specifically, the plug plate 66 includes a flat plate body 661 and a limit bar 662 disposed on the front end surface of the flat plate body 661 and extending transversely. The flat plate body 661 and the limit bar 662 are combined to form a T-shaped structure. The two ends of the limit bar 662 are respectively provided with a through hole 663. The flat plate body 661 is fixedly connected to the top plate 632 by screws 67 and is provided with a through hole 664 for the coupling 633 to move. When the plug plate 66 is connected to the threaded hole 651 on the front end surface of the guide slide bar 65 by screws 67 through the through holes 663 at both ends of the limit bar 662, the limit bar 662 can effectively prevent the plug plate 66 from shaking in directions other than the front and rear directions, thereby ensuring the position stability of the oil cylinder 63 after installation, ensuring the relative position accuracy between the oil cylinder 63 and the pull rod 62 and other components, and facilitating the normal operation of the vacuum valve.

[0045] In fact, the oil cylinder 63 is located deep in the notch 21. To facilitate the disassembly of the oil cylinder 63, the limit bar 662 of the plug plate 66 is connected to an outwardly extending extension rod 681, and one end of the extension rod 681 away from the plug plate 66 is connected to a handle 682. The staff can use the handle 682 to operate.

[0046] The vacuum exhaust block structure 8 includes a vacuum filter 69 and an exhaust block. The exhaust block is provided with a wave groove and an exhaust hole connected to the wave groove. The exhaust hole cooperates with the exhaust pin to form an exhaust gap. The exhaust block is connected to the vacuum generating device of the die casting machine through the vacuum filter 69. The continuous undulating design of the wave groove can slow down the flow speed of the aluminum liquid until it stops, and collect the excess aluminum liquid. Since the vacuum exhaust block structure 8 is located at the end of the product (at the edge of the outer convex wall module 533), the continuous exhaust and vacuum maintenance can promote the metal liquid to better fill the terminal area, ensure the molding integrity of the terminal part, improve the overall mechanical properties and appearance quality of the product, and make the left and right D-pillars of the car have better performance at key parts such as the terminal connection, thereby enhancing the safety and stability of the whole vehicle.

[0047] Since the clamping force of the left and right D-pillar castings 4 of the automobile on the fixed mold is relatively large, a special fixed mold ejection structure needs to be set up for easy demoulding. In the traditional fixed mold ejection structure, the elastic force of the spring 983 of the ejection assembly 98 directly acts on the ejector mounting plate 94, so that the ejector 97 on the ejector mounting plate 94 moves toward the cavity, thereby ejecting the casting 4. When the die-casting mold is closed, the ejector mounting plate 94 is driven away from the cavity, so that the spring 983 of the ejection assembly 98 re-stores energy. However, in such a structure, since the ejection assembly 98 directly acts on the ejector mounting plate 94, after actual production, the mold undergoes a large number of opening and closing movements, which easily causes the ejector mounting plate 94 to be deformed by force, making it difficult to ensure the ejection balance of the ejector 97.

[0048] See Figure 4 , Figures 8 to 11 To this end, the present invention provides a fixed mold ejection structure, which is specifically as follows: a pressure plate 93 located behind a fixed mold core 12 is fixed on the fixed mold frame 11, and an ejector mounting plate 94 and an ejector push plate 95 are arranged between the pressure plate 93 and the fixed mold core 12. The fixed mold core 12 is penetrated by multiple ejectors 97 and a return rod 96, and one end of the return rod 96 is connected to an ejection assembly 98. The ejector mounting plate 94 and the ejector push plate 95 clamp the ejector 97 and the ejection assembly 98 by splicing them front and back. Multiple ejection assemblies 98 and return rods 96 are distributed at the corners of the ejector mounting plate 94. The ejection assembly 98 provides a force for the ejector mounting plate 94, the ejector push plate 95, the ejector 97 and the return rod 96 to move toward the mold cavity.

[0049] In the fixed mold ejection structure, when the casting 4 needs to be ejected, the thrust generated by the ejection assembly 98 directly acts on the return rod 96. Since the return rod 96 is connected to the ejection assembly 98 in a one-to-one correspondence, the return rod 96 obtains the power to move toward the mold cavity under the action of the spring 983 of the ejection assembly 98. The ejector mounting plate 94 and the ejector push plate 95 clamp the ejector 97 and the ejection assembly 98 by splicing them front and back. At this time, the ejector mounting plate 94 and the ejector push plate 95 are indirectly stressed. With the movement of the return rod 96, the ejector mounting plate 94 and the ejector push plate 95 are driven to move as a whole, thereby causing the ejector 97 to penetrate the fixed mold core 12 and move toward the mold cavity to eject the casting 4. When the die-casting mold is closed, the ejector mounting plate 94 and the ejector push plate 95 are driven away from the cavity. In this process, the spring 983 of the ejection assembly 98 re-stores energy to prepare for the next ejection of the casting 4.

[0050] By directly driving the thrust of the spring 983 ejection assembly 98 to the return rod 96, the way in which the spring 983 elastic force directly acts on the ejector mounting plate 94 in the traditional structure is changed, so that the ejector mounting plate 94 and the ejector push plate 95 are indirectly stressed, and the force distribution is more uniform, avoiding the problem of the ejector mounting plate 94 being deformed due to the concentrated force caused by a large number of mold opening and closing movements. Since the ejector mounting plate 94 is not easy to deform, it can better ensure the ejection balance of multiple ejectors 97 during the ejection of the casting 4, improve the quality and stability of the demolding of the casting 4, and is conducive to improving the production accuracy and production efficiency of die-casting products such as automotive parts, reducing the scrap rate, extending the service life of the mold, and reducing the increase in production costs caused by mold maintenance and replacement of parts. It has significant progressive significance and practical value in the field of die-casting mold technology.

[0051] Specifically, the pop-up assembly 98 includes a sleeve 981 with a closed end, a bolt 982, a spring 983, a pressing sleeve 984 and a limiting ring 985. The tail end of the bolt 982 is threadedly connected to the limiting ring 985. The spring 983 and the pressing sleeve 984 can be movably sleeved on the bolt 982. The head of the bolt 982 limits the pressing sleeve 984 from being separated from the bolt 982. The pressing sleeve 984 can drive the spring 983 to be compressed toward the limiting ring 985. Since the bolt 982 and the limiting ring 985 are threadedly connected, the spring 983 and the limiting ring 985 can be movably sleeved on the bolt 982. The compression degree of the spring 983 can be precisely adjusted by rotating the bolt 982, thereby changing the elastic force of the spring 983; the spring 983 can release the elastic force to press the pressing sleeve 984 toward the pressing plate 93. When the spring 983 releases the elastic force, the pressing sleeve 984, as a force transmission medium, can stably transmit the elastic force of the spring 983 to the pressing plate 93, and then act on the ejector 97 through the return rod 96, the ejector mounting plate 94, the ejector push plate 95 and other components to achieve accurate ejection of the casting 4. This force transmission path is clear and accurate, which helps to ensure the stability and consistency of the ejection process and further improve the demoulding quality and accuracy of the casting 4.

[0052] The open end of the sleeve 981 is provided with a positioning outer ring 9810 for the ejector mounting plate 94 and the ejector push plate 95 to clamp, that is, the ejector mounting plate 94 and the ejector push plate 95 are provided with an annular groove adapted to the positioning outer ring 9810. The setting of the positioning outer ring 9810 provides an accurate clamping and positioning reference for the ejector mounting plate 94 and the ejector push plate 95, so that the two can be quickly and accurately positioned when clamping the ejection assembly 98, ensuring the assembly accuracy of the entire ejection structure. During the long-term operation of the mold, this precise positioning helps to maintain the relative position relationship between the ejector mounting plate 94 and the ejector push plate 95 and other components stable, thereby ensuring the ejection position accuracy of the ejector 97 and the consistency of the ejection action, and effectively improving the stability of the demolding quality of the casting 4. In addition, one end of the return rod 96 is fixed to the closed end of the sleeve 981 by a fixing ring 986 and a screw 67, forming a stable and reliable connection method. When the ejection assembly 98 is working, the elastic force released by the spring 983 can be efficiently transmitted to the return rod 96 through the sleeve 981, avoiding the loss or deviation of force transmission caused by loose connection. This reliable connection and force transmission mechanism ensures the timeliness and effectiveness of the ejection action, ensures that the casting 4 can be demolded smoothly, and improves the working efficiency and production reliability of the mold.

[0053] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0054] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0055] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and inventive concept of the present invention, and all these changes or substitutions should fall within the protection scope of the present invention.

Claims

1. A die-casting mold for left and right D-pillars of a car, characterized in that: It includes a fixed mold frame, a movable mold frame, a square iron and a movable mold bottom plate which are arranged in sequence from front to back, a fixed mold core is arranged on the fixed mold frame, a movable mold core is arranged on the movable mold frame, the fixed mold core and the movable mold core are combined to form a mold cavity, the mold cavity includes a left cavity and a right cavity which are symmetrically arranged on the left and right, a mold gate is arranged between the left cavity and the right cavity, the left cavity and the right cavity both include a straight wall module, an upper folded wall module and an outer convex wall module on the movable mold core, the straight wall module, the upper folded wall module and the outer convex wall module are converged into a three-way shape, the inner edges of the straight wall module and the upper folded wall module are connected to form an obtuse long side, the mold gate is connected to the obtuse long side through a diverter, and a first vacuum valve connected to the outer edge of the upper folded wall module, a second vacuum valve connected to the outer edge of the straight wall module, and a vacuum exhaust block structure connected to the edge of the outer convex wall module are provided on the movable mold core.

2. The die-casting mold for the left and right D-pillars of a car according to claim 1, characterized in that: The first vacuum valve and the second vacuum valve both include a vacuum filter, a vacuum insert arranged on the cavity of the moving mold core, a pull rod axially passing through the vacuum insert and controlling the opening and closing of the vacuum port, and an oil cylinder driven by the pull rod. The vacuum insert is connected to the vacuum generating device of the die-casting machine through the vacuum filter.

3. The die-casting mold for the left and right D-pillars of a car according to claim 1, characterized in that: A notch for installing the oil cylinder is provided on the side of the movable mold frame, and two guide slide bars which are arranged at intervals and extend forward and backward are fixed on the inner top surface of the notch. A plug plate which can slide with the two guide slide bars is provided on the top of the oil cylinder, and a threaded hole is provided on the front end surface of each guide slide bar, and through holes which are the same in number and correspond one to one to the threaded holes are provided on the front end surface of the plug plate, and a screw is inserted into each through hole to connect it with the corresponding threaded hole.

4. The die-casting mold for the left and right D-pillars of a car according to claim 3, characterized in that: The oil cylinder comprises an oil cylinder body and a top plate arranged on the oil cylinder body. The piston rod of the oil cylinder body is connected to the pull rod through a coupling. Two flat grooves are provided on the side wall of the end of the pull rod connected to the coupling. The side wall on the coupling is provided with a snap-in mounting opening that engages with the flat groove of the pull rod. The top plate is provided with an avoidance opening corresponding to the snap-in mounting opening.

5. The die-casting mold for the left and right D-pillars of a car according to claim 4, characterized in that: A radial positioning block is arranged on the top plate, a radial positioning groove matching with the radial positioning block is arranged on the side wall of the coupling, the plug plate comprises a flat plate body and a limit strip arranged on the front end surface of the flat plate body and extending laterally, the flat plate body and the limit strip are combined to form a T-shaped structure, a through hole is respectively arranged on the two ends of the limit strip, the flat plate body is fixedly connected to the top plate by screws and is provided with a through hole for the coupling to move.

6. The die-casting mold for the left and right D-pillars of a car according to claim 5, characterized in that: The limiting strip of the plug board is connected with an extension rod extending outward, and one end of the extension rod away from the plug board is connected with the handle.

7. The die-casting mold for the left and right D-pillars of an automobile according to claim 1, characterized in that: The vacuum exhaust block structure includes a vacuum filter and an exhaust block. The exhaust block is provided with a wave groove and an exhaust hole connected to the wave groove. The exhaust hole cooperates with the exhaust pin to form an exhaust gap. The exhaust block is connected to the vacuum generating device of the die-casting machine through the vacuum filter.

8. The die-casting mold for the left and right D-pillars of an automobile according to claim 1, characterized in that: A pressure plate located behind the fixed mold core is fixed on the fixed mold frame, and an ejector mounting plate and an ejector push plate are arranged between the pressure plate and the fixed mold core. The fixed mold core is penetrated by multiple ejectors and return rods, and one end of the return rod is connected to a pop-up assembly. The ejector mounting plate and the ejector push plate clamp the ejector and the pop-up assembly by splicing them front and back. Multiple pop-up assemblies and return rods are distributed at the corners of the ejector mounting plate, and the pop-up assembly provides a force for the ejector mounting plate, the ejector push plate, the ejector and the return rod to move toward the mold cavity.

9. The die-casting mold for the left and right D-pillars of an automobile according to claim 8, characterized in that: The pop-up assembly includes a sleeve with a closed end, a bolt, a spring, a pressure sleeve and a limit ring. The tail end of the bolt is threadedly connected to the limit ring. The spring and the pressure sleeve can be movably mounted on the bolt. The head of the bolt limits the pressure sleeve from being separated from the bolt. The pressure sleeve can drive the spring to be compressed toward the limit ring, and the spring can release the elastic force to press the pressure sleeve toward the pressure plate.

10. The die-casting mold for the left and right D-pillars of an automobile according to claim 9, characterized in that: The open end of the sleeve is provided with a positioning outer ring for clamping the ejector mounting plate and the ejector push plate, and one end of the return rod is fixed to the closed end of the sleeve through a fixing ring and a screw.

Images