Front die for magnesium alloy die casting

Abstract

The front mold comprises a front mold frame and a front mold core, a top plate, a spring mounting plate and an insert pin mounting plate are sequentially and horizontally arranged on the front mold frame from outside to inside, the top plate is fixedly embedded in the outer surface of the front mold frame, the spring mounting plate is fixedly connected with the insert pin mounting plate, and the insert pin mounting plate is fixedly connected with the front mold frame. The top plate is connected with the spring mounting plate through a plurality of telescopic springs, the top end of the forming insert pin is fixedly arranged in the insert pin mounting plate, a plurality of return pins are further arranged in the insert pin mounting plate, located on one side of the forming insert pin and far away from the product cavity, and the top ends of the return pins are fixedly arranged in the insert pin mounting plate. And the bottom end of the return pin is movably arranged in the front mold core or the front mold frame in a penetrating manner. By adopting the front die provided by the utility model, the problem of shrinkage caused by unsmooth exhaust of a magnesium alloy die-casting product can be effectively avoided, and the forming quality can be ensured; and the water-based release agent can be effectively prevented from being accumulated to block the insert pin hole, off-machine cleaning is not needed, the magnesium alloy die-casting production efficiency can be improved, and the labor intensity can be reduced.

Description

Technical Field

[0001] The utility model relates to a front mold for magnesium alloy die-casting, belonging to the technical field of die-casting molds. Background Art

[0002] With the improvement of environmental awareness and the rapid development of new energy vehicles, the lightweight characteristics of magnesium alloys have made them have wide application potential in many fields, including automobile manufacturing, electronic product manufacturing, aerospace, etc. For example: in the automobile manufacturing industry, the use of magnesium alloy die-casting technology to manufacture automobile parts, such as engine hoods, doors, seat frames, etc., helps to achieve lightweight, energy saving and emission reduction, and safety improvement of automobiles. In addition, magnesium alloy die-casting technology in the power system can be used to manufacture components such as cylinder heads and oil pans, which can improve the performance and efficiency of the power system.

[0003] However, the existing front mold structure for magnesium alloy die casting is as shown in the attached Figure 1 As shown, it includes a front mold frame and a front mold core arranged in the front mold frame, a product cavity is arranged on the front mold core, a plurality of pin holes connected to the product cavity are pierced in the front mold core, and forming pins are arranged in the pin holes. Since the forming pins in the existing front molds for magnesium alloy die-casting are fixedly installed, the gas in the product cavity cannot be discharged during the production process, which not only easily causes shrinkage problems in magnesium alloy die-casting products and affects the molding quality of magnesium alloy die-casting products, but also the water-based mold release agent is easy to accumulate and block the pin holes. After a period of production, the front mold needs to be taken off the machine for cleaning, which affects the production efficiency of magnesium alloy die-casting and increases labor intensity. Utility Model Content

[0004] In view of the above problems existing in the prior art, the purpose of the utility model is to provide a front mold for magnesium alloy die-casting which can improve the molding quality and production efficiency.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A front mold for magnesium alloy die-casting, comprising a front mold frame and a front mold core arranged in the front mold frame, the front mold core is provided with a product cavity, the front mold core is provided with a plurality of pin holes connected with the product cavity, the pin holes are provided with forming pins, a top plate, a spring mounting plate and a pin mounting plate are horizontally arranged in sequence from outside to inside on the front mold frame, the top plate is fixedly embedded in the outer surface of the front mold frame, the spring mounting plate is fixedly connected to the pin mounting plate, the top plate and the spring mounting plate are connected by a plurality of telescopic springs, the top end of the forming pin It is fixed in the pin mounting plate, and a plurality of return pins are also arranged in the pin mounting plate. The return pins are located on one side of the molding pins and away from the product cavity. The top end of the return pins is fixed in the pin mounting plate, and the bottom end of the return pins is movably inserted in the front mold core or the front mold frame; and, when the telescopic spring is in an extended state, the bottom end of the return pins extends out of the bottom surface of the front mold core or the front mold frame and the extended length of the return pins is equal to the maximum stroke distance of the telescopic spring; when the telescopic spring is in a contracted state, the bottom surface of the return pins is flush with the bottom surface of the front mold core or the front mold frame.

[0007] In one implementation, a top plate embedding groove matched with the top plate is provided in the front mold frame, the top plate is fixedly installed in the top plate embedding groove, a mounting groove connected to the top plate embedding groove is provided below the top plate embedding groove, and the spring mounting plate and the pin mounting plate are movably installed in the mounting groove.

[0008] In a preferred embodiment, the height dimension of the mounting groove is adapted to the sum of the height dimensions of the spring mounting plate and the pin mounting plate and the maximum travel distance of the telescopic spring.

[0009] In one embodiment, the top plate is connected to the spring mounting plate via at least two telescopic springs.

[0010] In one implementation scheme, spring installation grooves adapted to the telescopic springs are provided at the bottom of the top plate and the top of the spring installation plate, and the two ends of the telescopic spring are respectively installed in the spring installation grooves at corresponding positions.

[0011] In one embodiment, at least two return pins are symmetrically arranged in the pin mounting plate, wherein the bottom ends of one part of the return pins are movably inserted into the front mold core, and the bottom ends of the other part of the return pins are movably inserted into the front mold frame.

[0012] A preferred solution is to provide four return pins symmetrically in the pin mounting plate in front and back and left and right directions, wherein the bottom ends of two return pins are movably inserted into the front mold core, and the bottom ends of the other two return pins are movably inserted into the front mold frame.

[0013] Compared with the prior art, the beneficial technical effects of the utility model are:

[0014] By adopting the front mold provided by the utility model, when the magnesium alloy die-casting mold production is carried out, the bottom end of the return pin extending out of the bottom surface of the front mold core or the front mold frame will be pushed upward to be flush with the bottom surface of the front mold core or the front mold frame, so that the telescopic spring is in a contracted state, the spring mounting plate and the pin mounting plate are pushed to the highest position, and then the forming pin is lifted up, so that the gas in the product cavity can be discharged smoothly, thereby effectively avoiding the shrinkage cavity problem caused by poor exhaust of the magnesium alloy die-casting product, and ensuring the molding quality of the magnesium alloy die-casting product; in addition, when the mold is opened, the bottom end of the return pin is freely released, so that the telescopic spring is in an extended state, so that the spring mounting plate and the pin mounting plate are pushed to the lowest position by the telescopic spring, and then the forming pin is moved down into the product cavity, which plays a role in unblocking the pin hole, thereby effectively preventing the accumulation of water-based mold release agent and clogging the pin hole, without the need for off-machine cleaning, and can improve the production efficiency of magnesium alloy die-casting and reduce labor intensity; therefore, compared with the prior art, the utility model has obvious practical value and progressiveness. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the structure of the existing front mold for magnesium alloy die casting;

[0016] Figure 2 is a schematic diagram of the three-dimensional structure of a front mold for magnesium alloy die-casting in an original state (i.e., mold opening) provided in an embodiment;

[0017] Figure 3 is a state diagram showing the molding pin and the telescopic spring described in the embodiment when the front mold is in the original state (i.e., mold opening);

[0018] Figure 4 It is a state diagram showing the return pin described in the embodiment when the front mold is in the original state (i.e., mold opening);

[0019] Figure 5 It is a schematic diagram of the three-dimensional structure of the front mold for magnesium alloy die-casting provided in the embodiment in the original state (ie, open mold) and after the front mold frame is removed;

[0020] Figure 6 is a longitudinal cross-sectional structural diagram of the front mold frame described in the embodiment;

[0021] Figure 7 is a schematic diagram of the three-dimensional structure of a front mold for magnesium alloy die-casting provided in an embodiment in a working state (i.e., mold closing);

[0022] Figure 8 It is a state diagram showing the molding pin and the telescopic spring described in the embodiment when the front mold is in a working state (i.e., mold closing);

[0023] Fig. 9It is a state diagram showing the return pin described in the embodiment when the front mold is in a working state (i.e., mold closing);

[0024] The numbers in the figure are as follows:

[0025] 1. Front mold frame; 1-1. Top plate embedding groove; 1-2. Mounting groove; 1-3. Top plate fixing hole; 1-4. Insert pin hole; 1-5. Return pin hole; 2. Front mold core; 3. Product cavity; 4. Forming insert pin; 5. Top plate; 6. Spring mounting plate; 7. Insert pin mounting plate; 8. Telescopic spring; 9. Return pin;

[0026] 1', a front mold frame in an existing front mold for magnesium alloy die-casting; 2', a front mold core in an existing front mold for magnesium alloy die-casting; 3', a product cavity in an existing front mold for magnesium alloy die-casting; 4', a forming pin in an existing front mold for magnesium alloy die-casting. DETAILED DESCRIPTION

[0027] The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the utility model should be the common meanings understood by people with general skills in the field. The directions or positional relationships indicated by the terms "inside", "outside", "upper", "lower", "top", "bottom", "front", "back", "left", "right", etc. are based on the directions or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying that the device referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the utility model. In addition, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection; it can be an indirect connection or a direct connection. For ordinary technicians in the field, the specific meanings of the above terms in this application can be understood according to the specific circumstances; it should also be noted that when an element is referred to as "fixed on" or "set on" another element, it can be directly on another element or there can also be a central element.

[0028] Example

[0029] Please combine Figures 2 to 9As shown: A front mold for magnesium alloy die-casting provided in this embodiment comprises a front mold frame 1 and a front mold core 2 arranged in the front mold frame 1, the front mold core 2 is provided with a product cavity 3, a plurality of pin holes (i.e., channels through which forming pins 4 are passed) communicating with the product cavity 3 are penetrated in the front mold core 2, a forming pin 4 is provided in the pin holes, a top plate 5, a spring mounting plate 6 and a pin mounting plate 7 are horizontally arranged in sequence from the outside to the inside on the front mold frame 1, the top plate 5 is fixedly embedded in the outer surface of the front mold frame 1, the spring mounting plate 6 is fixedly connected to the pin mounting plate 7, the top plate 5 The plate 5 is connected to the spring mounting plate 6 through a plurality of telescopic springs 8. The top end of the molding insert pin 4 is fixedly arranged in the insert pin mounting plate 7. A plurality of return pins 9 are also arranged in the insert pin mounting plate 7. The return pins 9 are located on one side of the molding insert pin 4 and away from the product cavity 3. The top end of the return pin 9 is fixedly arranged in the insert pin mounting plate 7. The bottom end of the return pin 9 is movably inserted into the front mold core 2 or the front mold frame; and when the telescopic spring 8 is in an extended state, the bottom end of the return pin 9 extends out of the bottom surface of the front mold core 2 or the front mold frame 1 and the extension length of the return pin is equal to the maximum travel distance of the telescopic spring (see Figure 3 and Figure 4 When the telescopic spring 8 is in the contracted state, the bottom surface of the return pin 9 is flush with the bottom surface of the front mold core 2 or the front mold frame 1 (see Figure 8 and Fig. 9 as shown).

[0030] In the present invention, the number and distribution of the molding pins 4 can be adjusted according to the product to be molded. In this embodiment, two molding pins 4 are used as an example, but the number is not limited to two.

[0031] Please combine again Figure 3 , Figure 4 , Figure 6 and Figure 8 As shown, in this embodiment, a top plate embedding groove 1-1 adapted to the top plate 5 is provided in the front mold frame 1, the top plate 5 is fixedly installed in the top plate embedding groove 1-1, a mounting groove 1-2 connected to the top plate embedding groove 1-1 is provided below the top plate embedding groove 1-1, and the spring mounting plate 6 and the pin mounting plate 7 are movably installed in the mounting groove 1-2. Top plate fixing holes 1-3 are provided around the top of the mounting groove 1-2, and pin insertion holes 1-4 and return pin holes 1-5 are provided at the bottom of the mounting groove 1-2 (see Figure 6 As shown); place the top plate 5 into the top plate embedding groove 1-1, and pass the screws through the top plate to the top plate fixing hole 1-3 to achieve fixed installation of the top plate 5. The installation groove 1-2 combined with the top plate 5 can limit the spring mounting plate 6 and the pin mounting plate 7.

[0032] A preferred solution is that the height dimension of the mounting groove 1-2 is adapted to the sum of the height dimensions of the spring mounting plate 6 and the needle mounting plate 7 and the maximum travel distance of the telescopic spring 8, so as to ensure that the spring mounting plate 6 and the needle mounting plate 7 have adapted moving space under the action of the telescopic spring 8.

[0033] In the present invention, the top plate 5 is connected to the spring mounting plate 6 by at least two telescopic springs 8. In this embodiment, four telescopic springs 8 are symmetrically arranged in front and back and left and right as an example (see Figure 5 As shown), this design can effectively ensure that the spring mounting plate 6 and the needle mounting plate 7 can move up and down stably, and thus can effectively ensure that the return needle 9 and the forming needle 4 can move up and down stably.

[0034] In addition, spring mounting grooves adapted to the telescopic springs 8 are provided at the bottom of the top plate 5 and the top of the spring mounting plate 6 (see Figure 3 and Figure 8 As shown in the figure, the position of the telescopic spring 8 is the position of the spring installation slot), and the two ends of the telescopic spring 8 are respectively installed in the spring installation slots at the corresponding positions. The telescopic spring 8 is installed and limited by the spring installation slot, which can effectively ensure that the telescopic spring 8 can stably perform linear telescopic movement.

[0035] In the utility model, at least two return pins 9 are symmetrically arranged in the pin mounting plate 7, wherein the bottom ends of one part of the return pins 9 are movably inserted into the front mold core 2, and the bottom ends of the other part of the return pins 9 are movably inserted into the front mold frame 1. In this way, the return pins 9 can be evenly distributed in the entire front mold, and can move up and down relative to the front mold core 2 and the front mold frame 1 at the same time, thereby effectively ensuring that the return pins 9 can move up and down stably, and further ensuring that the molding pins 4 can move up and down stably.

[0036] Please see again Figure 5 As shown, in this embodiment, four return pins 9 are symmetrically arranged in the front and back and left and right directions in the pin mounting plate 7, wherein the bottom ends of two return pins 9 are movably inserted into the front mold core 2, and the bottom ends of the other two return pins 9 are movably inserted into the front mold frame 1.

[0037] The working principle of the front mold for magnesium alloy die casting described in the utility model is as follows:

[0038] Because when the telescopic spring 8 is in the extended state, the bottom end of the return pin 9 extends out of the bottom surface of the front mold core 2 or the front mold frame 1 and the extended length of the return pin is equal to the maximum stroke distance of the telescopic spring 8; when the telescopic spring 8 is in the contracted state, the bottom surface of the return pin 9 is flush with the bottom surface of the front mold core 2 or the front mold frame 1; therefore, when the magnesium alloy die-casting mold is produced, the bottom end of the return pin 9 extending out of the bottom surface of the front mold core 2 or the front mold frame 1 will be pushed upward to be flush with the bottom surface of the front mold core 2 or the front mold frame 1, so that the telescopic spring 8 is in the contracted state, the spring mounting plate 6 and the pin mounting plate 7 are pushed to the highest position, and then the molding pin 4 is lifted up and leaves the product cavity 3 (please refer to Figure 8 As shown), the gas in the product cavity 3 can be discharged smoothly, thereby effectively avoiding the shrinkage problem of the die-cast product caused by poor exhaust. After the mold is opened, the bottom end of the return pin 9 is freely released, so that the telescopic spring 8 is in an extended state, and the spring mounting plate 6 and the needle mounting plate 7 are pushed to the lowest position by the telescopic spring 8, so that the molding needle 4 moves down into the product cavity 3 (please refer to Figure 3 As shown), it plays the role of clearing the pin hole and can effectively prevent the accumulation of water-based release agent to block the pin hole.

[0039] From the above, it can be seen that the front mold provided by the utility model can not only effectively avoid the shrinkage problem of magnesium alloy die-casting products caused by poor exhaust, but also ensure the molding quality of magnesium alloy die-casting products; it can also effectively prevent the accumulation of water-based mold release agent to block the pin holes, without the need for off-machine cleaning, and can improve the production efficiency of magnesium alloy die-casting and reduce labor intensity; therefore, compared with the prior art, the utility model has obvious practical value and progress.

[0040] Finally, it is necessary to point out that the above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited to this. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed by the utility model should be covered within the protection scope of the utility model.

Claims

1. A front mold for magnesium alloy die-casting, comprising a front mold frame and a front mold core arranged in the front mold frame, wherein the front mold core is provided with a product cavity, the front mold core is provided with a plurality of pin holes connected with the product cavity, and the pin holes are provided with forming pins; characterized in that: A top plate, a spring mounting plate and a pin mounting plate are horizontally arranged in sequence from the outside to the inside on the front mold frame, the top plate is fixedly embedded in the outer surface of the front mold frame, the spring mounting plate is fixedly connected to the pin mounting plate, the top plate and the spring mounting plate are connected via a plurality of telescopic springs, the top end of the forming pin is fixedly arranged in the pin mounting plate, a plurality of return pins are also arranged in the pin mounting plate, the return pins are located on one side of the forming pin and away from the product cavity, the top end of the return pin is fixedly arranged in the pin mounting plate, the bottom end of the return pin is movably inserted into the front mold core or the front mold frame; and, when the telescopic spring is in an extended state, the bottom end of the return pin extends out of the bottom surface of the front mold core or the front mold frame and the extending length of the return pin is equal to the maximum stroke distance of the telescopic spring; when the telescopic spring is in a contracted state, the bottom surface of the return pin is flush with the bottom surface of the front mold core or the front mold frame.

2. The front mold for magnesium alloy die casting according to claim 1, characterized in that: A top plate embedding groove matched with the top plate is provided in the front mold frame, the top plate is fixedly installed in the top plate embedding groove, a mounting groove connected with the top plate embedding groove is provided below the top plate embedding groove, and the spring mounting plate and the pin mounting plate are movably installed in the mounting groove.

3. The front mold for magnesium alloy die casting according to claim 2, characterized in that: The height dimension of the mounting groove is adapted to the sum of the height dimensions of the spring mounting plate and the needle mounting plate and the maximum travel distance of the telescopic spring.

4. The front mold for magnesium alloy die casting according to claim 1, characterized in that: The top plate is connected to the spring mounting plate via at least two telescopic springs.

5. The front mold for magnesium alloy die casting according to claim 1, characterized in that: A spring installation groove matched with the telescopic spring is arranged at the bottom of the top plate and the top of the spring installation plate, and two ends of the telescopic spring are respectively installed in the spring installation grooves at corresponding positions.

6. The front mold for magnesium alloy die casting according to claim 1, characterized in that: At least two return pins are symmetrically arranged in the pin mounting plate, wherein the bottom ends of one part of the return pins are movably inserted into the front mold core, and the bottom ends of the other part of the return pins are movably inserted into the front mold frame.

7. The front mold for magnesium alloy die casting according to claim 6, characterized in that: Four return pins are symmetrically arranged in the pin mounting plate in a front-to-back and left-to-right manner, wherein the bottom ends of two return pins are movably inserted into the front mold core, and the bottom ends of the other two return pins are movably inserted into the front mold frame.

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