Internal parting mold and ejection method of product therein

Abstract

The present invention discloses an internal split mold and a method for ejecting a product therein. The internal split mold comprises a front mold and a rear mold. The lower part of the rear mold is provided with an ejector plate, a ejector block assembly is fixed on the ejector plate, a front mold undercut area is provided on the inner side of the front mold, a first guide rail seat and at least one second guide rail seat are fixed on the rear mold, and two inclined ejector assemblies are also fixed on the ejector plate. A push rod assembly is provided in one inclined ejector assembly, one end of the push rod assembly is connected to one end of the product, and the other end of the push rod assembly is arranged in the guide rail of the first guide rail seat; at least one pull block assembly is provided in the other inclined ejector assembly, the number of the pull block assemblies is the same as the number of the second guide rail seats, one end of the pull block assembly is connected to the other end of the product, and the other end of the pull block assembly is arranged in the guide rail of the corresponding second guide rail seat. Through the mold and the method for ejecting a product therein of the present invention, the product is deformed in the mold to complete the demoulding structure, and the mold movement is ensured to be smooth.

Description

Technical Field

[0001] The invention relates to an internal parting mould and an ejection method of a product therein, belonging to the technical field of injection moulds. Background Art

[0002] With the development of the plastics industry, plastic products are expanding and being used more and more widely in various industries, and the structure of products is becoming more and more complex. There are higher standards for the precision matching of molds and the stability of dimensions. The complexity of products directly places higher requirements on the stability of mold structures. How to ensure the simplicity of processing, the convenience of maintenance, and the rationality of structure while simplifying the structure has become a series of research courses.

[0003] The rapid development of science and technology has led to a rapid reduction in product replacement cycles. Shortening delivery time and responding quickly to market demand have become the first factors for injection mold companies to participate in market competition. In order to meet the improvement of the quality of life, in some more humanized product development, plastic products have a more cutting-edge appearance, visual sense, application properties, and mold structures are becoming more complex. Compared with traditional mold design, modern mold design has undergone earth-shaking changes, especially the design of mold structure, and some product functional requirements, and typical cases of special structures have also been born. Here, it is more necessary to consider the rationality and stability of the structure, the simplicity of processing and the convenience of production! How to optimize and penetrate the existing structure to obtain a simple, cost-controlled, more reasonable and effective mold structure.

[0004] The front and rear bumpers are located right in front and rear of the car, and are sensitive parts of the exterior. Figure 1a , Figure 1b As shown in the figure, it is a rear bumper on a car, and it is also the first appearance of the car, which is equivalent to a person's "face". The appearance requirements are quite high. Especially for some high-end brand cars, it is clearly stated that a parting line on the outside affects the aesthetics. From the optimization and troubleshooting of plastic properties to structural infeasibility, it has a defect that the maximum contour line of the product section 1 is Figure 2a Magnified view of the middle R angle—— Figure 2b The parting line on the left side of the R angle is called the outer parting line a because it is on the visible surface. This structure is a conventional structure and is also the most acceptable design for processing and assembly. In the figure, b is the inner parting line; c is the appearance area of ​​the product; and d is the assembly area of ​​the product.

[0005] Now customers require that the parting surface be placed on the product assembly surface, so that the defects of the parting line can be covered after the assembly is completed. The hidden and (internal parting) parting line is used. As shown in Figure 1, the assembly area is located just below the R angle. Now the direction is clear. It needs to be placed below the R angle, as shown in Figure 2, the internal parting line position. In this way, the R angle needs to be wrapped around the front mold, and an undercut will be generated on the front mold. Figure 4a , Figure 4b As shown, this processing is quite difficult, and a five-axis machine tool must be used to meet the processing requirements. This problem can be solved by general factories. The front mold is undercut, and the mechanism of the rear mold will interfere when opening and closing the mold. How to solve this problem has become a key issue in the production of this product. In addition, due to the large front and rear bumpers, the mold is nearly 26 tons. Solving the above problems also puts unprecedented pressure on designers. Summary of the invention

[0006] The technical problem to be solved by the present invention is: how to make the product with undercuts be smoothly demolded by using the push-pull block plus guide rail solution.

[0007] In order to solve the above technical problems, the technical solution of the present invention is to provide an internal parting mold, including a front mold and a rear mold, the lower part of the rear mold is provided with an ejector plate, and an ejector block assembly for ejecting the product is fixed on the ejector plate, characterized in that the inner side of the front mold is provided with a front mold undercut area matching the undercut outer side of the product, a first guide rail seat and at least one second guide rail seat are fixed on the upper side of the rear mold, and two inclined ejector assemblies for assisting in ejecting the product are also fixed on the ejector plate, wherein,

[0008] A push rod assembly is provided in a tilting ejector assembly, one end of the push rod assembly is connected to one end of the product, and the other end of the push rod assembly is arranged in the guide rail of the first guide rail seat; when the mold is opened, the push rod assembly moves in the guide rail of the first guide rail seat, so that the product is separated from the undercut area of ​​the front mold;

[0009] At least one pull block assembly is arranged in the other inclined top assembly, the number of the pull block assemblies is the same as the number of the second guide rail seats, one end of the pull block assembly is connected to the other end of the product, and the other end of the pull block assembly is arranged in the guide rail of the corresponding second guide rail seat; during the mold opening process, each pull block assembly moves in the guide rail of the corresponding second guide rail seat, so that the undercut of the product is separated from the rear mold;

[0010] The two inclined ejector assemblies and the ejector block assembly all move synchronously with the ejector plate.

[0011] Preferably, the inclined ejector assembly comprises an inclined ejector rod and an inclined ejector, the top end of the inclined ejector rod is connected to the lower end of the inclined ejector; the inclined ejector rod is vertically arranged relative to the horizontally placed ejector pin plate, and the inclined ejector is arranged with its end inclined toward the center of the mold; the upper end of the inclined ejector is arranged with its upper end inclined toward the center of the mold;

[0012] The guide rail of the first guide rail seat is divided into four sections, which are the first section, the second section, the third section, and the fourth section connected in sequence according to the order in which the push rod assembly passes on the guide rail of the first guide rail seat during the mold opening process;

[0013] The guide rail of the second guide rail seat is also divided into four sections, which are the fifth section, the sixth section, the seventh section, and the eighth section connected in sequence according to the order in which the pull block assembly passes on the guide rail of the first guide rail seat during the mold opening process;

[0014] The first and fifth sections are both arranged with their ends tilted toward the center of the mold so that the product can be separated from the undercut area of ​​the front mold; the second section is arranged vertically relative to the horizontally placed ejector plate; the front section of the sixth section is arranged vertically relative to the horizontally placed ejector plate, and the rear section of the sixth section is arranged tilted toward the center of the mold so that the undercut of the product can be separated from the rear mold; the third section is arranged with its end tilted away from the center of the mold, and the end of the third section is arranged on the projection of the head end of the first section on the ejector plate; the seventh section is arranged with its end tilted toward the center of the mold; the fourth and eighth sections are both arranged vertically relative to the horizontally placed ejector plate.

[0015] Preferably, the inclination angles of the first section and the fifth section are the same, both smaller than the inclination angle of the slanted roof, and the difference between the two is 0-1 degree; the inclination angle of the slanted roof is the angle between the slanted roof top rod and the right hypotenuse of the slanted roof; the inclination angle of the first section is the angle between the straight line where the first section is located and the slanted roof top rod; the inclination angle of the fifth section is the angle between the straight line where the fifth section is located and the slanted roof top rod.

[0016] Preferably, the inclination angle of the inclined roof is 8 degrees to 15 degrees.

[0017] Preferably, the inclination angle of the inclined roof is 12 degrees to 15 degrees.

[0018] Preferably, the push rod assembly includes a push block, on which are fixed two push block guide rods for controlling the movement direction of the push block in the inclined roof; one end of the push rod is fixed to the push block, and the other end of the push rod is arranged in the guide rail of the first guide rail seat.

[0019] Preferably, the other end of the push rod is connected to two guide pulleys through a pin, and the guide pulleys are arranged in the guide rail of the first guide rail seat.

[0020] Preferably, the pulling block assembly comprises a pulling block, a pushing block connected to one end of a pulling rod via a guiding block, the other end of the pulling rod being arranged in the guide rail of the second guide rail seat, and two pulling block guiding rods being arranged on the pushing block.

[0021] Preferably, the other end of the pull rod is connected to two guide pulleys through a pin, and the guide pulleys are arranged in the guide rail of the second guide rail seat.

[0022] A method for ejecting a product in an inner parting mold includes three stages of ejection:

[0023] First stage ejection:

[0024] When the ejector plate drives the inclined ejector assembly to do the ejection movement, the inclined ejector moves away from the front mold, that is, the AB plates (i.e., the upper and lower mold plates) are parted, and the inclined ejector and the front mold are not parted. The lower part with undercuts on the product is pushed by the push rod assembly to complete the deformation of the product in the mold, so that the product is separated from the undercut area of ​​the front mold. Subsequently, the front mold and the inclined ejector assembly are parted;

[0025] The deformation of the product is based on the highest point of the inclined top as the base point, and the part of the inclined top below the base point moves in the direction of the inclined top to complete the deformation;

[0026] Second stage ejection:

[0027] When the ejector plate continues to drive the inclined ejector assembly to perform ejection movement, the deformed product is controlled inside the mold and does not move. All the pull block assemblies move together with the inclined ejector assembly. The inclined ejector assembly moves the product out of the undercut position on the rear mold, so that all the pull block assemblies complete the ejection action inside the pull block.

[0028] The third stage of ejection:

[0029] When the ejector plate continues to drive the inclined ejector assembly to perform ejection movement, the push block restores the deformed product and increases the stroke of the inclined ejector assembly to facilitate the removal of the product.

[0030] By using the mold and the method for ejecting the product therein of the present invention, the product is deformed in the mold to complete the demolding structure. The calculation of the structural motion trajectory ensures smooth mold movement, avoids interference of the rear mold mechanism during mold opening and closing, reduces the risk of assembly interference, simplifies assembly difficulty, and makes machining feasible. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1a It is a schematic diagram of the product structure;

[0032] Figure 1b for Figure 1a A magnified schematic diagram of the C position in the middle;

[0033] Figure 2a for Figure 1a AA section view;

[0034] Figure 2b for Figure 2a A partial enlarged view of the middle A;

[0035] Figure 3 It is a schematic diagram of the deformation base point and deformation driving force of the product;

[0036] Figure 4aIt is a schematic diagram of the undercut position on the front mold;

[0037] Figure 4b for Figure 4a A partial enlarged view of point B in the middle;

[0038] Figure 5 This is a schematic diagram of an inner-partitioned inclined roof structure;

[0039] Figure 6 It is a structural schematic diagram of an inner parting mold;

[0040] Figure 7a is a perspective view of a push rod assembly;

[0041] Figure 7b is the front view of the push rod assembly;

[0042] Figure 7c is a top view of the push rod assembly;

[0043] Figure 8a is a three-dimensional diagram of a pull block assembly;

[0044] Figure 8b This is the main view of the pull block component;

[0045] Figure 8c A top view of the pull block assembly;

[0046] Fig. 9 It is a rendering of an assembly of the inclined top assembly, the push block assembly and the pull block assembly;

[0047] Fig.10a It is a side view of the inclined top assembly and the pull block assembly;

[0048] Fig.10b for Fig.10a BB cross-sectional view;

[0049] Fig.11a It is a schematic diagram of the push block assembly, the product and the front mold during mold closing;

[0050] Fig.11b for Fig.11a A partial enlarged view of the middle A;

[0051] Fig.11c It is a schematic diagram of the pull block assembly, the product and the front mold during mold closing;

[0052] Fig.12a This is a schematic diagram of the push block assembly, the product and the front mold during the first stage of ejection;

[0053] Figure 12b for Fig.12a A partial enlarged view of point D in the middle;

[0054] Fig.12c This is a schematic diagram of the pull block assembly, the product and the front mold during the first stage of ejection;

[0055] Fig.13a This is a schematic diagram of the push block assembly, the product and the front mold during the second stage of ejection;

[0056] Fig.13b This is a schematic diagram of the pull block assembly, the product and the front mold during the second stage of ejection;

[0057] Fig.13c for Fig.13b Schematic diagram of the A-direction position;

[0058] Fig.14a This is a schematic diagram of the push block assembly, the product and the front mold during the third stage of ejection;

[0059] Fig.14b This is a schematic diagram of the pull block assembly, product and front mold during the third stage of ejection. DETAILED DESCRIPTION

[0060] In order to make the present invention more clearly understood, preferred embodiments are described in detail below with reference to the accompanying drawings.

[0061] The present invention is an internal parting mold. For ease of understanding, it only shows the structural part that we need to express. Since the mold is quite large, only a partial diagram is shown below to explain the movement process of the mold. Figure 6 As shown, it includes a front mold 17, a rear mold 18, an ejector plate 19, and some other mold mechanisms. The ejector plate 19 is arranged at the lower part of the rear mold 18. The ejector plate 19 has a 170MM ejection stroke space, which is reserved here for the subsequent mechanism action. Figure 5 As shown, there is a 170MM three-stage ejection stroke. The inner side of the front mold 17 is provided with a front mold undercut area 20 that matches the undercut outer side of the product, such as Figure 4a , Figure 4b As shown, a first guide rail seat 10 and at least one second guide rail seat 14 are fixed on the rear mold 18, and an ejector block assembly 16 for ejecting products and two inclined ejector assemblies L1 for assisting in ejecting products are fixed on the ejector plate 19, wherein:

[0062] A push rod assembly L2 is provided in a tilting ejector assembly L1, one end of the push rod assembly L2 is connected to one end of the product, and the other end of the push rod assembly L2 is provided in the guide rail of the first guide rail seat 10; when the mold is opened, the push rod assembly L2 moves in the guide rail of the first guide rail seat 10, so that the product is separated from the front mold undercut area 20;

[0063] At least one pull block assembly L3 is provided in another inclined top assembly L1, the number of pull block assemblies L3 is the same as the number of second guide rail seats 14, one end of the pull block assembly L3 is connected to the other end of the product, and the other end of the pull block assembly L3 is provided in the guide rail of the corresponding second guide rail seat 14; during the mold opening process, each pull block assembly L3 moves in the guide rail of its corresponding second guide rail seat 14, so that the undercut of the product is separated from the rear mold 18.

[0064] The inclined ejector assembly L1 includes an inclined ejector rod 4 and an inclined ejector 3. The top end of the inclined ejector rod 4 is connected to the bottom end of the inclined ejector 3. The inclined ejector rod 4 is vertically arranged relative to the horizontal ejector plate 19. The end of the inclined ejector 3 is inclined toward the center of the mold; the upper end of the inclined ejector 3 is inclined toward the center of the mold. Since the inclined ejector rod 4 and the ejector block assembly 16 are both connected to the ejector plate 19, the inclined ejector 3 and the ejector block assembly 16 are synchronously moved with the ejector plate 19.

[0065] like Figure 6 As shown, the guide rail of the first guide rail seat 10 is divided into four sections, which are the first section, the second section, the third section, and the fourth section connected in sequence according to the order in which the push rod assembly L2 passes on the guide rail of the first guide rail seat 10 during the mold opening process. The guide rail of the second guide rail seat 14 is also divided into four sections, which are the fifth section, the sixth section, the seventh section, and the eighth section connected in sequence according to the order in which the pull block assembly L3 passes on the guide rail of the first guide rail seat 10 during the mold opening process. The first and fifth sections are both arranged with their ends tilted toward the center of the mold, so that the product can be separated from the front mold undercut area 20; the second section is arranged vertically relative to the horizontal ejector plate 19; the front section of the sixth section is arranged vertically relative to the horizontal ejector plate 19, and the rear section of the sixth section is arranged tilted toward the center of the mold, so that the undercut of the product can be separated from the rear mold 18; the third section is arranged with its end tilted away from the center of the mold, and the end of the third section is arranged on the projection of the head end of the first section on the ejector plate 19; the seventh section is arranged with its end tilted toward the center of the mold; the fourth and eighth sections are both arranged vertically relative to the horizontal ejector plate 19. The first and fifth sections have the same tilt angle, which is smaller than the tilt angle of the inclined ejector 3, and the difference between the two is 0-1 degree; the tilt angle of the inclined ejector 3 is the angle between the inclined ejector pin 4 and the right hypotenuse of the inclined ejector 3; the tilt angle of the first section is the angle between the straight line where the first section is located and the inclined ejector pin 4; the tilt angle of the fifth section is the angle between the straight line where the fifth section is located and the inclined ejector pin 4. The maximum applicable range of the inclination angle of the inclined roof 3 is 8 degrees to 15 degrees. Among them, the optimal range of the inclination angle of the inclined roof 3 is 12 degrees to 15 degrees.

[0066] like Figure 7a-7c As shown, the push block assembly L2 is arranged in the inclined top 3 of an inclined top assembly L1, because its function is to control the deformation of the product in the mold (such as Figure 3The product deformation base point and deformation driving force 2) are finally pushed back to the original position. The push block assembly L2 includes a push block 5, which is connected to a push block guide rod 6. The push block guide rod 6 is used to control the movement direction of the push block 5 in the inclined top 3. One end of the push rod 7 is connected to the push block 5, and the other end is connected to the first guide rail seat 10. The medium connecting it to the first guide rail seat 10 is a pin 9 plus two guide pulleys 8. The guide pulleys 8 are arranged in the guide rail of the first guide rail seat 10. The advantage of this is that the push block 5 is not easy to get stuck when moving on the first guide rail seat 10.

[0067] like Figure 8a-8c As shown, the pull block assembly L3 is arranged in the inclined top 3 of another inclined top assembly L1, and it is mainly used to solve some undercut problems that the inclined top 3 cannot be demolded normally. The pull block assembly L3 includes a pull block 11, and the pull block 11 is connected to one end of a pull rod 13 through a guide block 15. The other end of the pull rod 13 is arranged in the guide rail of the second guide rail seat 14. Two pull block guide rods 12 are arranged on the pull block 11. The other end of the pull rod 13 is connected to two guide pulleys 8 through a pin 9, and the guide pulleys 8 are arranged in the guide rail of the second guide rail seat 14. Fig.10a , Fig.10b Its layout can be seen in the figure, with a 48-degree angle ( Figure 6 (Seen from the right side, it is the angle between the lift rod 4 and the pull rod 13). This angle is determined according to the product features and can be any angle. One end of the pull rod 13 is connected to the guide block 15. This 48-degree angle requires a guide block 15 to solve the problem of movable joints during movement. It is exactly the same as the structure of the push block assembly L2, except that its pull block guide rod 12 is angled, and a guide block 15 is added. Because it needs to have an undercut inside the lift, the angle of the pull block guide rod 12 is currently designed to be 27 degrees (i.e. the angle between the pull block guide rod 12 and the pull rod 13). Fig.10a , Fig.10b The flexibility of this structure is reflected in the perfect cooperation between the pull rod 13 and the pull block guide rod 12, so it can solve the undercut problem of any angle (48 degrees) of the inclined top 3.

[0068] like Figure 5 As shown, the angle between the pull block guide rod 12 and the pull rod 13 is arctan(e / (g*tanA)), the inclination angle of the inclined ejector 3 is A, the undercut size of the product is e, the first-stage ejection distance (i.e., the movement distance of the inclined ejector rod 4 when the push rod 7 moves in the first section of the first guide rail seat 10; or the movement distance of the inclined ejector rod 4 when the pull rod 13 moves in the fifth section of the second guide rail seat 14) is f, and the second-stage ejection distance (i.e., the length of the second section of the first guide rail seat 10) is g; the pull rod 13 is fixed on the pull block 11 and cannot rotate, while the pull block guide rod 12 can rotate.

[0069] like Fig. 9 As shown, it is mainly a rendering of an assembly of the inclined top assembly L1, the push block assembly L2 and the pull block assembly L3. The main difficulty of this structure lies in the design of this large inclined top, in which a push block assembly L2 and N pull block assemblies L3 can be designed. In this embodiment, only one pull block assembly L3 is needed. The structural details vary from product to product. Figure 5 The internally divided inclined roof structure diagram explains how they work in coordination.

[0070] In this embodiment, the main Figure 5 The internal splitting inclined top structure is the core component of this structure. It consists of an inclined top 3, a push block 5, a pull block 11, and of course, N pull blocks 11 can be formed. This needs to be determined according to the actual situation of the product, but the composition of this structure needs to be completed by these three mechanisms. If the product does not meet the design of these three structures, you can negotiate with the product designer to increase and improve the product features required by the mold structure.

[0071] Combination Figure 5 The car bumper has a split-type inclined roof structure, such as Figure 11a-Figure 14b As shown, an analysis and explanation is made on the three stages of the mold opening sequence. Fig.11a , Fig.11c This is a diagram of the mold closing state, with the push block assembly L2 on the left and the pull block assembly L3 on the right. Fig.11a , Fig.11b You can see the tip of the inclined lift assembly L1, which is the base point for controlling product deformation (such as Figure 3 As shown). Now the inclined ejector is in the first stage. This process needs to move synchronously with the front mold. A mold opening mechanism is required here, which will not be explained in the present invention.

[0072] like Figure 12a-Figure 12c As shown, the first stage ejects 70MM (i.e., when the push rod 7 moves in the first section of the first guide rail seat 10, the moving distance of the inclined ejector rod 4 is 70MM; or when the pull rod 13 moves in the fifth section of the second guide rail seat 14, the moving distance of the inclined ejector rod 4 is 70MM), L1 is designed to be 12 degrees (i.e., the inclination angle of the inclined ejector 3), and L2 / L3 is designed to be 11 degrees (i.e., the inclination angle of the first section and the inclination angle of the fifth section). There is an angle difference of 1 degree here, and its function is to compensate for the processing error design. If the processing angle here is too large, the mold will get stuck during movement. When the mold is ejected 70MM, the L1 stroke is 14.88, and the L2 / L3 stroke is 13.6. Here, L2 will "hold" the product and move inward 13.6. Because there are some protruding shapes on L2, they can hold together and force the product to deform inward at the base point, such as Fig.12aAs shown, it can be seen that the product has been deformed by 13.6, the product has been separated from the front mold undercut, the safety distance has reached 9.4, L2 also moves synchronously here, it and L1 basically move in unison, and its undercut stroke can now be ignored. At this time, the front mold can be completely separated from the inclined ejector and enter the second stage of ejection.

[0073] like Figure 13a-Figure 13c As shown, the second stage of ejection is designed from 70 and the ejector plate to the position of 120 (ejection 50) (that is, when the push rod 7 moves in the second section of the first guide seat 10, the moving distance of the inclined ejector rod 4 is 50MM; or when the pull rod 13 moves in the sixth section of the second guide seat 14, the moving distance of the inclined ejector rod 4 is 50MM). In this process, the guide line of L2 is vertical upward. Relatively speaking, L2 does not move here, which means that the relative position of the product in the mold does not deform. The situation of L3 is different. Its guide line is also vertical upward, and the relative position of L3 does not move. However, the difference is that two 27-degree pull block guide rods 12 are designed. When the L1 large inclined ejector and the L3 pull rod have a stroke of 11.9, because of this stroke, under the action of the pull block guide rod 12 at 27 degrees, L3 moves 6.06 (that is, the size of the product's undercut) in the direction of the guide block 15. As shown in FIG. Fig.13c As shown in the figure, the L1 inclined top inner undercut is demolded without the product moving. In this way, the undercut problem of the internal structure of the mold is basically solved.

[0074] like Fig.14a , Fig.14b As shown, the third stage of ejection is now continued (i.e., the distance that the push rod 7 moves in the third section of the first guide rail seat 10, and the distance that the lift rod 4 moves in the seventh section of the second guide rail seat 14). Its purpose is to restore the product deformation and at the same time, to allow the lifters L1 / L2 / L3 to completely detach from the product, so that the product can be demoulded smoothly. Here, the end point of L2 is restored to the starting point of L2, so that the product deformation restoration angle can be adjusted appropriately according to the product, and it does not have to be at the original starting point. L3 moves 10 degrees to the right, as shown in FIG. Fig.14b The ejection safety distance increases to 14.36, and the stroke of L1 reaches 36.12. At this time, the product is completely separated from the rear mold structure and the product is taken out.

[0075] Note: The units following the above length data are all in mm.

[0076] In the first stage, the second stage and the third stage, the lift assembly L1 moves upward all the time. After the first stage ends and before the second stage begins, that is, after the product is separated from the front mold undercut area 20, the lift assembly L1 stops moving and the front mold 17 moves upward, so that the front mold 17 is separated from the product.

[0077] The mold structure of the present invention can be derived into many mold structures that meet the product structure according to the different product structures, which can fully meet the current product diversification requirements. As customers' requirements for product appearance continue to increase, the internal parting structure will play its role to a greater extent. This structure is completely a related movement on the inclined top component L1. The design calculation method needs to be verified by motion simulation to be considered a qualified design.

Claims

1. An internal splitting mold, comprising a front mold (17) and a rear mold (18), wherein an ejector plate (19) is provided at the lower part of the rear mold (18), and an ejector block assembly (16) for ejecting a product is fixed on the ejector plate (19), characterized in that: The inner side of the front mold (17) is provided with a front mold undercut area (20) matching the undercut outer side of the product, a first guide rail seat (10) and at least one second guide rail seat (14) are fixed on the rear mold (18), and two inclined ejector assemblies (L1) for assisting in ejecting the product are also fixed on the ejector plate (19), wherein: A push rod assembly (L2) is provided in a tilting ejector assembly (L1), one end of the push rod assembly (L2) is connected to one end of the product, and the other end of the push rod assembly (L2) is arranged in the guide rail of the first guide rail seat (10); when the mold is opened, the push rod assembly (L2) moves in the guide rail of the first guide rail seat (10) so that the product is separated from the front mold undercut area (20); At least one pull block assembly (L3) is arranged in another inclined top assembly (L1), the number of the pull block assemblies (L3) is the same as the number of the second guide rail seats (14), one end of the pull block assembly (L3) is connected to the other end of the product, and the other end of the pull block assembly (L3) is arranged in the guide rail of the corresponding second guide rail seat (14); during the mold opening process, each pull block assembly (L3) moves in the guide rail of the corresponding second guide rail seat (14), so that the undercut of the product is separated from the rear mold (18); The two inclined ejector assemblies (L1) and the ejector block assembly (16) both move synchronously with the ejector plate (19); The inclined ejector assembly (L1) comprises an inclined ejector rod (4) and an inclined ejector (3), wherein the top end of the inclined ejector rod (4) is connected to the bottom end of the inclined ejector (3); the inclined ejector rod (4) is vertically arranged relative to a horizontally placed ejector pin plate (19), and the end of the inclined ejector (3) is inclined toward the center of the mold; the upper end of the inclined ejector (3) is inclined toward the center of the mold; The guide rail of the first guide rail seat (10) is divided into four sections, which are the first section, the second section, the third section and the fourth section connected in sequence according to the order in which the push rod assembly (L2) passes on the guide rail of the first guide rail seat (10) during the mold opening process; The guide rail of the second guide rail seat (14) is also divided into four sections, which are the fifth section, the sixth section, the seventh section, and the eighth section connected in sequence according to the order in which the pull block assembly (L3) passes on the guide rail of the first guide rail seat (10) during the mold opening process; The first section and the fifth section are both arranged with their ends tilted toward the center of the mold, so that the product can be separated from the front mold undercut area (20); the second section is arranged vertically relative to the horizontal ejector plate (19); the front section of the sixth section is arranged vertically relative to the horizontal ejector plate (19), and the rear section of the sixth section is arranged tilted toward the center of the mold, so that the undercut of the product can be separated from the rear mold (18); the third section is arranged with its end tilted away from the center of the mold, and the end of the third section is arranged on the projection of the head end of the first section on the ejector plate (19); the seventh section is arranged with its end tilted toward the center of the mold; the fourth section and the eighth section are both arranged vertically relative to the horizontal ejector plate (19); The first section and the fifth section have the same inclination angle, which is smaller than the inclination angle of the inclined top (3), and the difference between the two is 0-1 degree; the inclination angle of the inclined top (3) is the angle between the inclined top push rod (4) and the right hypotenuse of the inclined top (3); the inclination angle of the first section is the angle between the straight line where the first section is located and the inclined top push rod (4); the inclination angle of the fifth section is the angle between the straight line where the fifth section is located and the inclined top push rod (4); The push rod assembly (L2) comprises a push block (5), on which are fixed two push block guide rods (6) for controlling the movement direction of the push block (5) in the inclined top (3); one end of the push rod (7) is fixed on the push block (5), and the other end of the push rod (7) is arranged in the guide rail of the first guide rail seat (10); The pulling block assembly (L3) comprises a pulling block (11), the pulling block (11) is connected to one end of a pulling rod (13) via a guiding block (15), the other end of the pulling rod (13) is arranged in the guide rail of the second guide rail seat (14), and two pulling block guiding rods (12) are arranged on the pulling block (11); The pull block guide rod (12) is angled, and the tip of the inclined top assembly (L1) is the base point for controlling product deformation.

2. An internal parting mold according to claim 1, characterized in that: The inclination angle of the inclined roof (3) is 8 degrees to 15 degrees.

3. An internal parting mold according to claim 1, characterized in that: The other end of the push rod (7) is connected to two guide pulleys (8) through a pin (9), and the guide pulleys (8) are arranged in the guide rail of the first guide rail seat (10).

4. An internal parting mold according to claim 1, characterized in that: The other end of the pull rod (13) is connected to two guide pulleys (8) via a pin (9), and the guide pulleys (8) are arranged in the guide rail of the second guide rail seat (14).

5. A method for ejecting a product from an inner parting mold as claimed in claim 1, characterized in that: The ejection process consists of three stages: First stage ejection: When the ejector plate (19) drives the inclined ejector assembly (L1) to perform ejection movement, the inclined ejector (3) moves away from the front mold (17), and the push rod assembly (L2) pushes the lower part with undercut on the product, so that the product is deformed in the mold, so that the product is separated from the undercut area (20) of the front mold, and then the front mold (17) and the inclined ejector assembly (L1) are separated; The deformation of the product is based on the highest point of the inclined top (3) as the base point, and the part of the inclined top (3) below the base point moves in the direction of the inclined top (3) to complete the deformation; Second stage ejection: When the ejector plate (19) continues to drive the inclined ejector assembly (L1) to perform ejection movement, the deformed product is controlled to remain inside the mold without moving, and all the pull block assemblies (L3) move together with the inclined ejector assembly (L1). The inclined ejector assembly (L1) moves the product out of the undercut position on the rear mold (18), so that all the pull block assemblies (L3) complete the ejection action inside the pull block (11); The third stage of ejection: When the ejector plate (19) continues to drive the inclined ejector assembly (L1) to perform ejection movement, the push block (5) restores the deformed product and increases the stroke of the inclined ejector assembly (L1) to facilitate the removal of the product.

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