Die system for counter-pressure casting of steering knuckle and counter-pressure equipment

Abstract

The utility model relates to a die system for counter-pressure casting of a steering knuckle and counter-pressure equipment, the die system comprises a sealing cover, a bottom die core, an upper die core and a side pulling core which are positioned in the sealing cover, and a hydraulic core pulling structure assembly which is arranged on the inner side and the outer side of the sealing cover in a penetrating manner and is used for enabling the side pulling core to do reciprocating motion, the hydraulic core-pulling structure assembly comprises a plurality of movable guide rods fixedly connected with a core-pulling core head of the side-pulling core, a first core-pulling movable plate connected with one end of each movable guide rod, a hydraulic piston of a hydraulic cylinder fixedly connected to the first core-pulling movable plate, an oil cylinder fixing plate connected with the bottom of the hydraulic cylinder, and a second core-pulling movable plate connected with the oil cylinder fixing plate. The oil cylinder supporting rods are respectively mounted on the oil cylinder fixing plate; and the oil cylinder supporting rods penetrate through the sealing cover and are fixed on the side core-pulling internal mold. Therefore, the weight reduction requirement can be met, and the process and equipment requirements of the modeling steering knuckle are met.

Description

Technical Field

[0001] The utility model relates to the field of differential pressure casting, in particular to a mold system and differential pressure equipment for differential pressure casting of a steering knuckle. Background Art

[0002] Differential pressure casting, also known as reverse pressure casting or differential pressure casting, is developed on the basis of low-pressure casting. A sealing cover is placed outside the casting mold, and compressed air is introduced into the crucible and the sealing cover at the same time. However, there is a pressure difference between the crucible and the sealing cover. Under the action of the pressure difference, the molten metal in the crucible fills the mold cavity through the riser tube and crystallizes under pressure. It is a casting method. In essence, the alloy liquid is low-pressure casting when filling the mold, and solidifies (crystallizes) under pressure. It has the characteristics of two processes at the same time, and can obtain castings without pores, inclusions, and dense structure. Its mechanical properties are much better than those of general gravity casting and low-pressure casting.

[0003] At present, in order to adapt to the development trend of automobile energy conservation, emission reduction and lightweight, the requirements for the weight of differential pressure steering knuckle castings in the design process are getting higher and higher. In order to meet the weight requirements of customers and achieve the mechanical properties and mechanical properties of casting products, the design of differential pressure steering knuckle products has become more and more complicated. Since the differential pressure casting steering knuckle is generally filled by bottom injection, the mold design is carried out by upper and lower molds. However, due to the need to reduce weight, some steering knuckles are designed to reduce weight from the side, which will make it impossible to open the molds from top to bottom.

[0004] In this regard, the applicant believes that a side hydraulic core pulling structure design can be carried out during mold design. Figure 1 The following is an example of a differential pressure steering knuckle that requires a side core pulling design. However, the weight reduction on this side is beyond the norm, and the normal mold structure and conventional differential pressure equipment can no longer meet its mold opening requirements, which has caused great difficulties in mold design and differential pressure equipment.

[0005] On the other hand, Figure 2The schematic diagram of the upper and lower tanks of a conventional differential pressure machine is shown, including: an intermediate plate 51, a mold assembly 52, a movable table 53, a liquid riser 54, a crucible furnace 55, and a sealing cover 14. The crucible furnace 55 is placed under the movable table 53, generally referred to as the lower tank, and the mold assembly 52 is installed on the upper plate of the movable table 53, and a sealing cover 14 is placed on the periphery of the mold assembly 52 for sealing, generally referred to as the upper tank. During the casting process, compressed air is injected into the upper and lower tanks at the same time. When a certain pressure is reached, the pressure of the upper tank is maintained, and the pressure of the lower tank continues to increase, so that the aluminum liquid in the crucible furnace 55 flows up through the liquid riser 54 to the mold cavity to complete the casting process. For this differential pressure equipment, the upper tank is a sealed tank body, which belongs to a pressure vessel and is made by rolling square. Moreover, the internal temperature of the upper tank is relatively high. If a hydraulic cylinder is used for core pulling design, the hydraulic cylinder is set inside the sealing cover 14 and installed on the mold core. Due to the high temperature, it is very easy for the molding oil seal to leak oil, causing the hydraulic cylinder to fail. Designing a mechanical core puller inside the sealing cover 14 requires sufficient space and travel. Since the space is not allowed, the core puller structure design is greatly restricted.

[0006] Therefore, it is necessary to improve the existing mold structure and differential pressure equipment to adapt to the weight reduction requirements and meet the process and equipment requirements of the shaped steering knuckle.

[0007] The information in the above background technology section is only intended to increase the understanding of the overall background of the present invention, and shall not necessarily be regarded as an admission or suggestion in any form that the information constitutes the prior art known to those skilled in the art. Utility Model Content

[0008] In order to overcome the shortcomings of the existing differential pressure casting mold structure and the existing differential pressure casting equipment that cannot meet the side core pulling modeling requirements, the purpose of the utility model is to provide a mold system for differential pressure casting steering knuckles. On the one hand, on the basis of the existing differential pressure standard casting mold, appropriate structural adjustments are made to it to meet the side hydraulic core pulling structure requirements; on the other hand, on the basis of the existing standard differential pressure equipment, its sealing cover is modified to meet the differential pressure equipment's mold opening requirements for the side core pulling modeling steering knuckle.

[0009] According to one aspect of the utility model, a mold system for differential pressure casting steering knuckle is provided, characterized in that it includes: a sealing cover, a bottom mold core, an upper mold core and a side core pull located in the sealing cover, and a hydraulic core pull structure component that penetrates the inside and outside of the sealing cover and is used to make the side core pull reciprocate, wherein the hydraulic core pull structure component includes: a plurality of movable guide rods fixedly connected to the core pull core head of the side core pull, a first core pull movable plate connected to one end of the movable guide rod, a hydraulic piston of a hydraulic cylinder fixedly connected to the first core pull movable plate, a cylinder fixing plate connected to the bottom of the hydraulic cylinder, and a plurality of cylinder support rods respectively installed on the cylinder fixing plates, and the cylinder support rods pass through the sealing cover and are fixed to the bottom mold core.

[0010] Preferably, the core pulling head of the side core pulling is connected to the second core pulling movable plate via a pulling plate, and the other end of the movable guide rod is fixedly connected to the second core pulling movable plate, wherein the opening at the center position of the second core pulling movable plate is fixedly connected to one end of the hydraulic core pulling connecting shaft, and the other end of the hydraulic core pulling connecting shaft is fixedly connected to the pulling plate, and the pulling plate and the core pulling head are fixedly connected together.

[0011] Preferably, the pull plate is provided with a keyhole at the center position, one end of the hydraulic core pulling connecting shaft passes through the pull plate and is clamped, and the other end passes through the second core pulling movable plate and is clamped by the hydraulic core pulling end baffle. The hydraulic core pulling end baffle is a U-shaped plate, and a side groove is provided at the other end of the hydraulic core pulling connecting shaft, and the hydraulic core pulling end baffle is clamped into the side groove for fixed connection.

[0012] Preferably, one end of the four movable guide rods is connected to the first core-pulling movable plate, and the other end passes through the fixed sleeve and the cylinder fixed plate to be fixedly connected to the second core-pulling movable plate, and the four corners of the cylinder fixed plate are respectively installed with cylinder support rods.

[0013] Preferably, the sealing cover is provided with a through hole for the movable guide rod and the oil cylinder support rod to pass through, and the through hole is designed with a sealing gasket and a sealing ring.

[0014] Preferably, two limit rings are installed on the movable guide rod, and two limit switches are correspondingly provided on the support plate fixedly connected to the oil cylinder fixing plate.

[0015] Preferably, the hydraulic cylinder is arranged in an inverted manner: the rod chamber of the hydraulic cylinder is powered when the mold is closed, and the rodless chamber of the hydraulic cylinder is powered when the mold is opened.

[0016] According to another aspect of the utility model, a differential pressure device is provided, which has the above-mentioned mold system for differential pressure casting steering knuckle.

[0017] Preferably, the differential pressure device is a one-mold four-cavity structure, and each cavity side is independently provided with a set of mold systems.

[0018] According to the design of the utility model, the demand for weight reduction can be met and the process and equipment requirements for shaping the steering knuckle can be satisfied. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The following is a detailed description of the implementation scheme of the present invention in conjunction with the accompanying drawings, wherein:

[0020] Figure 1 Shows the knuckle shape that requires side core pulling design.

[0021] Figure 2 A simplified structural diagram of the upper and lower tanks of the differential pressure machine is shown.

[0022] Figure 3 The side core pulling mold structure is shown.

[0023] Figure 4 The side core pulling mold structure is shown after the upper mold core is hidden.

[0024] Figure 5 A side core pulling mold cavity layout diagram of one embodiment is shown.

[0025] Figure 6 The layout of the side core pulling mold opening state is shown.

[0026] Figure 7 A cross-sectional view showing the side core pulling and mold opening state.

[0027] Figure 8 The side hydraulic core pulling structure is shown.

[0028] Fig. 9 A partial cross-sectional view showing a hydraulic core pulling structure.

[0029] Fig.10 A parts drawing showing a hydraulic core pulling structure.

[0030] Fig.11 A perspective view of the sealing cover is shown. DETAILED DESCRIPTION

[0031] The exemplary embodiments of the present utility model are described in detail below in conjunction with the accompanying drawings. The exemplary embodiments described below and shown in the accompanying drawings are intended to teach the principles of the present utility model, so that those skilled in the art can implement and use the present utility model in several different environments and for several different applications. Therefore, the scope of protection of the present utility model is defined by the attached claims, and the exemplary embodiments are not intended to be, and should not be considered to be, a restrictive description of the scope of protection of the present utility model. Moreover, for the convenience of description, the sizes of the various parts shown in the accompanying drawings are not necessarily drawn according to the actual proportional relationship, and the orientation description, such as the longitudinal direction corresponding to the longitudinal length of the main body, and the orientation or position relationship indicated by the upper, lower, left, right, top, bottom, etc., are all based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0032] Although most steering knuckle products can be cast by differential pressure through upper and lower molds, there are some steering knuckles that cannot be designed by upper and lower molds due to requirements such as weight reduction. It is necessary to design side core pulling to open the mold first, and then open the upper and lower molds.

[0033] <Mold system>

[0034] According to the utility model, a mold system based on a side hydraulic core-pulling structure for differential pressure casting of an aluminum alloy steering knuckle is provided (hereinafter referred to as a "side core-pulling mold structure").

[0035] like Figure 3 As shown, the main components of the side core pulling mold structure include: mold bottom plate 1, blank casting 2, gate insert 3, bottom mold core 4, guide key 5, side core pulling 6, pull plate 7, upper mold core 8, mold upper plate 9, ejector plate 10, ejector plate 11, columnar pad 12, and spring 13.

[0036] The movement of the side core-pulling mold structure can be roughly divided into two types, one is the mold closing process, and the other is the mold opening process. The specific movement conditions are as follows.

[0037] Mold closing process: When closing the mold, the side core 6 is usually closed first to ensure that the side core is in place, and then the upper mold core 8 is closed together with the mold upper plate 9 to complete the mold closing and ensure that the mold core is tightly matched without aluminum leakage. The mold bottom plate 1 and the differential pressure device are fixed together by screws and remain motionless. The bottom mold core 4 is fixed to the mold bottom plate 1 by bolts, generally in an annular surface, one mold with four cavities or one mold with six cavities. The existing differential pressure equipment can mainly meet the one mold four cavities with side hydraulic core pulling structure (see Figure 5 , 6 , 8). The upper mold core 8 is connected to the mold upper plate 9 by bolts. The mold upper plate 9 together with the upper mold core 8 can move upward to realize mold opening. The pull plate 7 is fixed to the side core pulling 6 by screws, and the core pulling and returning to the outside can be realized by the action of the hydraulic cylinder.

[0038] Mold opening process: When opening the mold, the side core puller 6 usually starts to move first and is pulled outward to realize side mold opening. After the side core puller 6 is completely separated from the blank casting 2, the upper mold core 8 and the mold upper plate 9 are lifted up together to finally realize mold opening. In this way, it can ensure that the blank casting is stable and does not produce surface defects such as pulling.

[0039] Figure 4 The side core pulling mold structure behind the upper mold core 8 is hidden, so that the matching relationship between the side core pulling 6 and the blank casting 2 can be more intuitively seen. Among them, the side core pulling 6 has a core pulling core head 16.

[0040] Figure 4 , 5 A typical side core pulling mold cavity layout diagram of an embodiment is shown. This layout is a one-mold four-cavity layout mold, which is distributed in a circle, generally with two left and two right layouts, that is, two left pieces and two right pieces. Since the side core pulling is not centered, it is impossible to adopt a uniform distribution form. Among them, the main components are: bottom water collector 21, mold bottom plate 1, bottom mold core 4, blank casting 2, side core pulling 6.

[0041] from Figure 6 , Figure 7 It can be seen that even in the mold opening state, the side core pull 6 is still placed in the sealing cover 14 and does not interfere with the sealing cover 14 .

[0042] <Hydraulic core pulling system>

[0043] Figures 8 to 10 Shown is a hydraulic core pulling system for side core pulling.

[0044] Based on the position relative to the sealing cover 14 , the hydraulic core pulling system mainly includes: a hydraulic core pulling structural component 26 , a sealing cover structural component 27 , and a mold cavity structural component 28 .

[0045] The hydraulic core pulling structure component 26 mainly provides hydraulic power to pull the core pulling structure to reciprocate. The sealing cover structure component 27 is a pressure vessel and needs to be sealed. In addition to opening holes in the sealing cover 14 for necessary light bar connections, the hydraulic core pulling structure component 26 must also be fixed to achieve a supporting and fixing effect. Each cavity side core pulling corresponds to a set of hydraulic core pulling systems, and each cavity provides power independently, so there is no power interference problem. At the same time, because it is hydraulic pressure, the four core pullings can achieve synchronous movement during the reciprocating core pulling process, thereby avoiding the problem of individual core pulling not being in place. Fig. 9 A partial cross-sectional view of the hydraulic core pulling structural assembly 26 is shown.

[0046] More specifically Fig.10 As shown: the core puller 16 and the pull plate 7 are fixed together by screws and can be regarded as a whole for movement (see Figure 3). The pull plate 7 is provided with a keyhole at the center position, so that one end of the hydraulic core pulling connecting shaft 32 can pass through the pull plate 7 and be stuck, while the other end passes through the second core pulling movable plate 41 and is stuck by the hydraulic core pulling end baffle 31. This hydraulic core pulling end baffle 31 is a U-shaped plate, and the other end of the hydraulic core pulling connecting shaft 32 is provided with a side groove, and the hydraulic core pulling end baffle 31 can be stuck into the side groove so that the three are fixedly connected together. The four corners of the first core pulling movable plate 36 are provided with threaded holes for connecting the movable guide rods 35. One end of the four movable guide rods 35 is connected to the first core pulling movable plate 36, and the other end passes through the fixed sleeve 33 and the cylinder fixed plate 34 to be fixedly connected to the second core pulling movable plate 41. The four corners of the cylinder fixed plate 34 are respectively installed with cylinder support rods 42. The oil cylinder support rod 42 passes through the sealing cover 14 and is fixed in the threaded hole on the internal mold, so that the whole set of hydraulic core pulling is rigidly connected, and the fixed plate 34 can be fixed and immobilized, serving as the fixed plate of the hydraulic cylinder 38. The bottom of the hydraulic cylinder 38 is located on the oil cylinder fixed plate 34, and at the same time, the hydraulic piston 37 is fixedly connected to the first core pulling movable plate 36. In addition, on one side, there are two limit switches 40 fixed on a support plate, and this support plate is fixedly connected to the oil cylinder fixed plate 34. Two limit rings 39 are installed on the movable guide rod 35. When moving, the limit ring 39 touches the limit switch 40, and the hydraulic cylinder 38 will stop moving. The power is provided by the hydraulic pressure to make the core pulling move. From the perspective of hydraulic power, the hydraulic cylinder 38 mainly has the following two actions.

[0047] Mold closing process: When closing the mold, the rod chamber of the hydraulic cylinder 38 is energized, and the hydraulic oil enters the rod chamber, thereby driving the hydraulic piston 37 to move inward (relative to the sealing cover 14). The hydraulic piston 37 is fixedly connected to the center position of the first core-pulling movable plate 36, so that the first core-pulling movable plate 36 also moves accordingly. The four corners of the first core-pulling movable plate 36 are respectively equipped with one end of the moving guide rod 35, and the other end of the moving guide rod 35 is fixedly connected to the four corners of the second core-pulling movable plate 41, thereby driving the second core-pulling movable plate 41 to move toward the core-pulling side. The opening at the center position of the second core-pulling movable plate 41 is fixedly connected to one end of the hydraulic core-pulling connecting shaft 32, and the other end of the hydraulic core-pulling connecting shaft 32 is fixedly connected to the pull plate 7, and the pull plate 7 is fixedly connected to the core-pulling core head 16. Thereby driving the core-pulling core head 16 to move inward to realize the side core-pulling mold closing. After moving a certain distance, the inner limit ring 39 will touch the inner limit switch 40. Once the shift fork of the limit switch 40 rotates, it means that the limit switch starts to work and the hydraulic cylinder 38 needs to stop moving. It also means that the core puller 16 is in place.

[0048] Mold opening process: The mold opening process is just the opposite of the mold closing process. The rodless cavity of the hydraulic cylinder 38 is energized, and the hydraulic cylinder enters the rodless cavity, thereby driving the hydraulic piston 37 to move outward. The motion transmission process is the same as the mold closing state, except that after moving a certain distance, the outer limit ring 39 will touch the outer limit switch 40, so that the hydraulic cylinder 38 stops moving, the core puller 16 stops opening the mold, and the mold is opened in place.

[0049] In this way, when closing the mold, the hydraulic side core pulling structure is closed first, and under the action of hydraulic pressure, the four independent hydraulic side core pulling structures are closed at the same time to ensure that the core pulling system is closed in place, and there will be no problem of individual mold closing not being in place. Then, the upper plate 9 of the mold is closed downward together with the upper mold core 8. The upper mold core 8, the bottom mold core 4 and the core pulling are all closed in place and tightly sealed, and there will be no aluminum leakage during the filling process. When opening the mold, the hydraulic side core pulling structure is opened first, and under the action of hydraulic pressure, the four independent hydraulic side core pulling structures are opened at the same time to ensure that the four hydraulic side core pulling structures are separated from the casting body. Then, the upper mold and the upper mold core are opened upward together to pull the casting out of the bottom mold core 4 to achieve casting demolding and mold opening.

[0050] In the hydraulic core pulling structure, the hydraulic cylinder is reverse mounted (also called inverted), which is different from the general forward mounting structure of the hydraulic cylinder. One purpose is to avoid the core pulling head moving too fast when closing the mold, so as not to cause a great collision with the mold core, and the other purpose is to prevent the piston rod from baking at high temperature and leaking oil.

[0051] According to the connection method of the core pulling core head and the hydraulic core pulling system of the utility model, a detachable connection can be realized. Regarding the through-hole design of the sealing cover, generally speaking, the sealing cover of the differential pressure casting design belongs to a pressure vessel, and its sealing function is extremely strict, and is made by rolling. For this through-hole design, sealing gaskets and sealing rings are designed in the through-holes to prevent compressed air leakage. The reverse installation form of the hydraulic cylinder can ensure the slow and precise mold closing of the core pulling core head.

[0052] In the description of the present application, "multiple" means two or more than two, unless otherwise clearly and specifically defined. Unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected 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 this application can be understood according to the specific circumstances. Although the present invention has been described with reference to various specific embodiments, it should be understood that variations can be made within the spirit and scope of the concept of the described utility model. Therefore, it is intended that the present invention is not limited to the described embodiments, but will have the full scope defined by the language of the appended claims.

Claims

1. A mold system for differential pressure casting steering knuckle, characterized in that: include: A sealing cover (14), a bottom mold core (4), an upper mold core (8) and a side core pull (6) located inside the sealing cover (14), and a hydraulic core pull structure component (26) penetrating the inside and outside of the sealing cover (14) for causing the side core pull (6) to reciprocate, wherein the hydraulic core pull structure component (26) comprises: a plurality of movable guide rods (35) fixedly connected to the core pull core head (16) of the side core pull (6), a first core pull movable plate (36) connected to one end of the movable guide rod (35), a hydraulic piston (37) of a hydraulic cylinder (38) fixedly connected to the first core pull movable plate (36), a cylinder fixing plate (34) connected to the bottom of the hydraulic cylinder (38), and a plurality of cylinder support rods (42) respectively mounted on the cylinder fixing plates (34), wherein the cylinder support rods (42) pass through the sealing cover (14) and are fixed to the bottom mold core (4).

2. The mold system for differential pressure casting steering knuckle according to claim 1, characterized in that: The core pulling head (16) of the side core pulling (6) is connected to the second core pulling movable plate (41) via the pulling plate (7), and the other end of the movable guide rod (35) is fixedly connected to the second core pulling movable plate (41), wherein a hole at the center position of the second core pulling movable plate (41) is fixedly connected to one end of the hydraulic core pulling connecting shaft (32), and the other end of the hydraulic core pulling connecting shaft (32) is fixedly connected to the pulling plate (7), and the pulling plate (7) and the core pulling head (16) are fixedly connected together.

3. The mold system for differential pressure casting steering knuckle according to claim 2, characterized in that: The pull plate (7) is provided with a keyhole at the center position, one end of the hydraulic core pulling connecting shaft (32) passes through the pull plate (7) and is clamped, and the other end passes through the second core pulling movable plate (41) and is clamped by the hydraulic core pulling end baffle (31), the hydraulic core pulling end baffle (31) is a U-shaped plate, and the other end of the hydraulic core pulling connecting shaft (32) is provided with a side groove, and the hydraulic core pulling end baffle (31) is clamped into the side groove for fixed connection.

4. The mold system for differential pressure casting steering knuckle according to claim 2, characterized in that: One end of the four movable guide rods (35) is connected to the first core-pulling movable plate (36), and the other end passes through the fixed sleeve (33) and the cylinder fixed plate (34) to be fixedly connected to the second core-pulling movable plate (41). The four corners of the cylinder fixed plate (34) are respectively provided with cylinder support rods (42).

5. The mold system for differential pressure casting steering knuckle according to claim 1, characterized in that: The sealing cover (14) is provided with a through hole for the movable guide rod (35) and the oil cylinder support rod (42) to pass through, and the through hole is designed with a sealing gasket and a sealing ring.

6. The mold system for differential pressure casting steering knuckle according to claim 5, characterized in that: Two limit rings (39) are installed on the movable guide rod (35), and two limit switches (40) are correspondingly provided on a support plate fixedly connected to the oil cylinder fixing plate (34).

7. The mold system for differential pressure casting steering knuckle according to claim 1, characterized in that: The hydraulic cylinder (38) is arranged in an inverted manner such that when the mold is closed, the rod chamber of the hydraulic cylinder (38) is energized, and when the mold is opened, the rodless chamber of the hydraulic cylinder (38) is energized.

8. A differential pressure device, characterized in that: A mold system for differential pressure casting of a steering knuckle according to any one of claims 1 to 7.

9. The differential pressure device according to claim 8, characterized in that It is a one-mold four-cavity structure, and each cavity side is independently equipped with a set of mold systems.

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