Mold structure for thermoplastic parts with flanged ends that are less prone to flash.

Abstract

This invention discloses a mold structure for thermoplastic parts with flanged ends that are less prone to flash. The mold structure adds an upper pressure block and a lower pressure block to the upper and lower surfaces of the combined slider, respectively. When the mold is opened and closed, the upper template directly contacts the upper pressure block, and the push plate directly contacts the lower pressure block. After the combined slider, upper module and push plate form the molding cavity, the combined module will not directly rub against the upper template and push plate, thus preventing wear. The plastic part is less prone to flash during the molding process. In addition, the fit between the combined module and the upper and lower pressure blocks does not reach zero gap, so the molded cavity has an air venting function.

Description

Technical Field

[0001] This invention belongs to the field of machinery, and in particular relates to a mold structure that prevents flash from forming on the edges of thermoplastic parts with flanged ends. Background Technology

[0002] Currently, there are two main mold structures for plastic parts with flanges at the ends:

[0003] 1. The molded part is supported by a push plate, and the upper mold plate opens and closes the combined slider to move the combined slider to the target position to form the molded cavity. During the molding process, the push plate is attached to the lower surface of the combined slider, and the upper mold plate is attached to the upper surface of the combined slider. Each time the mold is opened and closed, friction will occur between the push plate and the combined slider, and between the upper mold plate and the combined slider. After a certain period of time, wear will occur, and gaps will be generated between them. Flash is easy to be generated on the flange edge. Especially for plastic parts with high requirements for the flash on the flange edge, the push plate and the combined slider need to be replaced frequently. Although this structure has a good venting effect, it cannot guarantee the control of flash.

[0004] 2. The blind cavity mold structure is used for molding. Although this structure can ensure that no flash is generated on the edge of the flange, it does not play a role in venting, so it is easy to cause underpressure. At the same time, when the flange thickness is small, it is particularly difficult to process the mold cavity or it is impossible to process the mold cavity.

[0005] Both of these structures have their own advantages and disadvantages, and each has its own limitations. Summary of the Invention

[0006] In order to solve the technical problems existing in the prior art, the present invention provides a mold structure for thermoplastic parts with flanged ends that are not prone to flash. This structure can at least ensure that there is no wear during mold opening and closing of the molded combined cavity, that is, there is no friction between the push plate and the upper module and the combined slider, so that the plastic part is not prone to flash around the periphery during the molding process, and the molded cavity has the function of venting.

[0007] To achieve the objectives of this invention, the mold structure provided herein for preventing flash formation on the edges of thermoplastic parts with flanged ends includes:

[0008] The upper mold includes an upper backing plate, a lower module, a wedge, and a wedge guide post;

[0009] The middle part includes a combined slider, an upper pressure block, a lower pressure block, a push plate, and a first fixed plate; the combined slider is mounted on the first fixed plate and is movable; the upper pressure block and the lower pressure block are respectively mounted on both sides of the combined slider to ensure that the lower module contacts the upper pressure block but not the combined slider during use, and the lower pressure block prevents the combined slider from contacting the push plate; the push plate is mounted on the first fixed plate.

[0010] During the mold opening and closing process, the inclined guide post is inserted into the inclined guide hole located on the combined slider, and under the action of the inclined guide post and the inclined wedge, the combined slider is pushed to move the upper pressure block (13) and the lower pressure block to the target position to form the molded cavity.

[0011] Furthermore, in some embodiments, the intermediate portion further includes a guide slider that provides a slide rail for the combined slider.

[0012] Furthermore, in some embodiments, the mold structure provided by the present invention further includes a core, one end of which is mounted on the first fixing plate and the other end of which passes through the push plate.

[0013] Furthermore, in some embodiments, the mold structure provided by the present invention further includes a pad placed on the bottom surface of the first fixing plate.

[0014] Furthermore, in some embodiments, the mold structure provided by the present invention further includes a lower mold, the lower mold including a base plate and a support block, the support block being installed between the first fixing plate and the base plate.

[0015] Furthermore, in some embodiments, the lower mold further includes a push rod for ejecting the push plate. The push plate, pushed by the push rod, ejects the plastic part, and the plastic part can be directly removed after ejection, facilitating the removal of the plastic part.

[0016] Furthermore, in some embodiments, the mold structure provided by the present invention further includes a second fixed plate, a return rod, and an elastic element that provides restoring force; one end of the push rod and the return rod are respectively mounted on the second fixed plate, and the other end of the push rod is connected to the push plate; the length of the return rod allows the push rod to return to its initial position; the elastic element is placed between the first fixed plate and the second fixed plate, ensuring that the push rod can automatically return to its initial position, reducing manual intervention.

[0017] Furthermore, in some embodiments, the mold structure provided by the present invention further includes a pad mounted on the bottom surface of the second fixing plate.

[0018] Another structure of the mold structure provided by the present invention includes:

[0019] The upper mold includes an upper pad, an upper module installed together with the upper pad, a wedge installed on the upper module, and a wedge guide post, one end of which passes through the upper module and is installed on the upper pad, and the other end extends out of the upper module and is suspended in the air;

[0020] The middle section includes a combined slider, a guide slider, a push plate, a first fixed plate, a core, a pad, an upper pressure block, and a lower pressure block. The combined slider is mounted on the first fixed plate. The guide slider is mounted on both sides of the combined slider to provide slide rails for the combined slider, enabling it to move. The upper pressure block and the lower pressure block are respectively mounted on both sides of the combined slider to ensure that the lower module contacts the upper pressure block but not the combined slider during use. The lower pressure block prevents the combined slider from contacting the push plate. The push plate is mounted on the first fixed plate. One end of the core is mounted on the first fixed plate, and the other end passes through the push plate. The pad is mounted on the bottom surface of the first fixed plate.

[0021] The lower mold includes a base plate, a pad plate, a second fixed plate, an elastic element, a return rod, a support block, and a push rod. The pad plate is installed between the base plate and the second fixed plate. The elastic element is placed between the pad block and the second fixed plate to provide restoring force. One end of the return rod and the push rod are respectively installed on the second fixed plate, and the other end of the push rod is connected to the push plate. The length of the return rod allows the push rod to return to its initial position. The support block is installed between the base plate and the pad block.

[0022] During the mold opening and closing process, the inclined guide post is inserted into the inclined guide hole located on the combined slider, and under the action of the inclined guide post and the inclined wedge, the combined slider is pushed to move the upper pressure block and the lower pressure block to the target position to form the molded cavity.

[0023] The method of using the mold provided by this invention is as follows: When closing the mold, the upper mold moves forward to the combined slider, so that the guide pin is inserted into the inclined guide hole located on the combined slider. Under the action of the inclined guide pin and the inclined wedge, the combined slider is pushed to drive the upper pressure block and the lower pressure block to move. After the inclined guide pin is fully inserted into the inclined guide hole, the combined slider drives the upper pressure block and the lower pressure block to move to the target position to form a molded cavity. After molding is completed, the upper mold moves away from the combined slider, and the inclined guide pin is pulled out from the inclined guide hole. Under the action of the inclined guide pin and the inclined wedge, the combined slider is pushed to drive the upper pressure block and the lower pressure block to move. After moving a certain distance, the molded plastic part can be taken out.

[0024] The mold structure provided by this invention adds an upper pressure block and a lower pressure block to the upper and lower surfaces of the combined slider, respectively. When the mold is opened and closed, the upper template directly contacts the upper pressure block, and the push plate directly contacts the lower pressure block. After the combined slider, the upper module and the push plate form the molding cavity, the combined module will not directly rub against the upper template and the push plate, thus preventing wear. The plastic part is less likely to have flash around its perimeter during the molding process. In addition, the fit between the combined module and the upper and lower pressure blocks does not reach zero gap, so the molded cavity has an air venting function.

[0025] The beneficial effects that the technical solution of this invention can achieve are at least:

[0026] 1. The molded cavity does not experience wear caused by mold opening and closing, and the plastic part is less likely to have flash around its perimeter;

[0027] 2. The molded cavity serves to release air and is also easy to process;

[0028] 3. It shortens the mold manufacturing cycle and makes replacement and maintenance easier. Attached Figure Description

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and, together with the description, serve to explain the principles of the invention. It is obvious that the drawings described below are merely some embodiments of the invention, and those skilled in the art can obtain other drawings based on these drawings without any inventive effort. In the drawings:

[0030] Figure 1 A schematic diagram of the overall structure of the mold structure provided by the present invention. Figure 1 ;

[0031] Figure 2 A schematic diagram of the overall structure of the mold structure provided by the present invention. Figure 2 ;

[0032] Figure 3 The left view of the mold structure provided by the present invention;

[0033] Figure 4 This is a schematic diagram of the molding cavity formed by moving the combined slider, upper pressure block and lower pressure block of the present invention to the target position;

[0034] Figure 5 for Figure 4 Left sectional view;

[0035] Figure 6 This is a schematic diagram of the combined slider described in this invention;

[0036] Figure 7 This is a schematic diagram of the combined slider structure described in this invention. Figure 1 ;

[0037] Figure 8 This is a schematic diagram of the combined slider structure described in this invention. Figure 2 ;

[0038] Figure 9 This is a schematic diagram of the upper pressure block described in this invention;

[0039] Figure 10This is a schematic diagram of the structure of the upper pressure block assembly as described in this invention;

[0040] Figure 11 This is a schematic diagram of the structure of the pressure block described in this invention;

[0041] Figure 12 This is a schematic diagram of the structure of the assembled pressure block as described in this invention;

[0042] In the attached diagram: 1-garbage nail, 2-base plate, 3-pad plate, 4-second fixing plate, 5-pad block, 6-first fixing plate, 7-slanted guide post, 8-slanted wedge, 9-second screw, 10-lower module, 11-upper pad block, 12-first screw, 13-upper pressure block, 14-combined slider, 15-guide slider, 16-lower pressure block, 17-push plate, 18-cavity, 19-support block, 20-return rod, 21-elastic element, 22-top rod, 23-plastic part, 24-pin, 25-screw, 26-flow channel, 27-screw. Detailed Implementation

[0043] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the invention will be more thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art.

[0044] Reference Figure 1 As shown, the mold structure provided by the present invention includes at least an upper mold and a middle part.

[0045] The upper mold includes an upper pad 11, a lower module 10 which is installed together with the upper pad 11 by a first screw 12 or a pin or other means, a wedge 8 and a wedge 7 which are installed on the lower module 10 by a second screw 9 or a pin or other means; one end of the wedge 7 passes through the upper module 10 and is installed on the upper pad 11, and the other end extends out of the lower module 10 and is suspended.

[0046] The middle part includes a combined slider 14, an upper pressure block 13, a lower pressure block 16, a push plate 17, and a first fixed plate 6. The combined slider 14 is placed on the first fixed plate 6 and is movable. The upper pressure block 13 and the lower pressure block 16 are respectively placed on both sides of the combined slider 14 to ensure that the lower module 10 contacts the upper pressure block 13 during use, but does not contact the combined slider 14. The lower pressure block 16 prevents the combined slider 14 from contacting the push plate 17. The first fixed plate 6 has an installation groove for the push plate 17, which can move up and down under the action of external force.

[0047] During the mold opening and closing process, the inclined guide post 7 is inserted into the inclined guide hole 141 located on the combined slider 14. Under the action of the inclined guide post 7 and the inclined wedge 8, the combined slider 14 is pushed, which in turn moves the upper pressure block 13 and the lower pressure block 16 to the target position to form a molding cavity for molding the plastic part 23. Figure 4 , Figure 5 As shown.

[0048] The upper pressure block 13 and the lower pressure block 6 are installed on both sides of the combined slider 14 in any way to ensure that the combined slider 14, the upper pressure block 13 and the lower pressure block 16 move together, such as by means of pins 24 and / or screws 25 respectively installed on both sides of the boss 141 of the combined slider 14.

[0049] In this mold structure, the combined slider 14 is divided into two parts, which are arranged opposite to each other. Each combined slider 14 has upper and lower pressure blocks installed on both sides. Figures 6-12 As shown. Correspondingly, the guide pillars 7 and wedges 8 on the upper mold are in two sets, which act on the two combined sliders 14 to realize the movement of the combined sliders 14, so as to achieve the purpose of opening and closing the mold, and are used for molding the plastic part 23 and removing the molded plastic part 23.

[0050] The upper backing plate 11 and the lower module 10 in the upper mold are respectively provided with through holes for forming the flow channel 26 and mounting holes for ensuring mold opening and closing. The mounting holes can be matched with mounting posts, and the two are connected to ensure effective molding.

[0051] Based on the above structure, the middle part also includes a guide slider 15 that provides a slide rail 151 for the combined slider 14. The guide slider 15 is placed on both sides of the combined slider 14 to ensure the movement of the combined slider 14.

[0052] like Figure 1 As shown, the mold structure provided in this paper also includes a core 18, one end of which is mounted on the first fixed plate 6, and the other end passes through the push plate 17 and is located between the combined sliders 14.

[0053] A pad 5 is also installed on the bottom surface of the first fixing plate 6 to improve the support force.

[0054] In this embodiment, the mold structure further includes a lower mold for support and installation, in addition to the structure described above. Figure 1 , Figure 2 and Figure 3 The lower mold includes at least a base plate 2 and a support block 19, with the support block 19 installed between the first fixed plate 6 and the base plate 2; when a pad block 5 is installed, the support block 19 is installed between the pad block 5 and the base plate 2.

[0055] To facilitate the removal of the molded plastic part 23, the lower mold here also includes an ejector pin 22 for ejecting the push plate 17. After the plastic part 23 is molded, the push plate 17, pushed by the ejector pin 22, ejects the plastic part, which can then be removed directly.

[0056] With the ejector pin 22 in place, to ensure that the push plate 17 automatically returns to its initial position (the position during the molding process) after the plastic part is removed by the ejector pin 22, the lower mold here also includes a second fixed plate 4, a return rod 20, and an elastic element 21; one end of the ejector pin 22 and the return rod 20 are respectively mounted on the second fixed plate 4, and the other end of the ejector pin 22 is connected to the push plate 17; the length of the return rod 20 allows the ejector pin 22 to return to its initial position; the elastic element 21 is placed between the first fixed plate 6 and the second fixed plate 4.

[0057] As the push plate 17 is moved vertically upward by the push rod 22, it drives the second fixed plate 4 installed at the bottom of the push rod 22 to move upward as well, compressing the elastic element 21. When the push plate 17 is completely pushed out to the target position and the plastic part is removed, no external force is applied to the push rod 22. The restoring force generated by the elastic element 21 causes the second fixed plate 4 to move downward, and the push rod 22 returns to its initial position under the action of the return rod 20.

[0058] A pad 3 is also installed on the bottom surface of the second fixing plate 4.

[0059] Reference Figures 1-12 In this embodiment, the complete structure of the mold may include the following components:

[0060] The upper mold includes an upper pad 11, an upper module 10 mounted together with the upper pad 11, a wedge 8 mounted on the upper module 10, and a wedge 7. One end of the wedge 7 passes through the upper module 10 and is mounted on the upper pad 11, while the other end extends out of the upper module 10 and is suspended in the air.

[0061] The middle part includes a combined slider 14, a guide slider 15, a push plate 17, a first fixed plate 6, a core 18, a pad 5, an upper pressure block 13, and a lower pressure block 16. The combined slider 14 is placed on the first fixed plate 6. The guide slider 15 is placed on both sides of the combined slider 14 to provide slide rails 151 for the combined slider 14, enabling the combined slider 14 to move. The upper pressure block 13 and the lower pressure block 16 are respectively placed on both sides of the combined slider 14 to ensure that the lower module 10 contacts the upper pressure block 13 during use, but does not contact the combined slider 14. The lower pressure block 16 prevents the combined slider 14 from contacting the push plate 17. The push plate 17 is placed on the first fixed plate 6. One end of the core 18 is installed on the first fixed plate 6, and the other end passes through the push plate 17. The pad 5 is placed on the bottom surface of the first fixed plate 6 by screws, pins, integral molding, or other means.

[0062] The lower mold includes a base plate 2, a pad 3 mounted on the base plate 1 by means of a nail 1, a pin, a screw, or other means, a second fixed plate 4 mounted on the pad 3 by means of a screw 27, a pin, or other means, an elastic element 21, a return rod 20, a support block 19, and a push rod 22; the elastic element 21 is placed between the second fixed plate 4 and the pad 5 to provide restoring force; one end of the return rod 20 and the push rod 22 are respectively mounted on the second fixed plate 4, and the other end of the push rod 22 is connected to the push plate 17; the length of the return rod 20 allows the push rod 22 to return to its initial position, and the support block 19 is mounted between the base plate 2 and the pad 5;

[0063] During the mold opening and closing process, the inclined guide post 7 is inserted into the inclined guide hole 141 located on the combined slider 14, and under the action of the inclined guide post 7 and the inclined wedge 8, the combined slider 14 is pushed to move the upper pressure block 13 and the lower pressure block 16 to the target position to form the molded cavity.

[0064] The elastic element 21 described in this article can be any element that can contract when subjected to an external force and return to its state before the external force is applied, such as a spring. The upper and lower pressure blocks can be higher or lower than the combined slider; of course, they can also be the same.

[0065] The number of return rod 20, top rod 22, elastic element 21, and support rod 19 described in this article can be set according to actual conditions.

[0066] The mold structure is fixed. The upper pad 11 is installed on the upper mold plate of the equipment, and the bottom plate 2 is installed on the lower mold plate of the equipment. When the mold opens, the upper pad 11 moves in the mold opening direction under the action of the equipment, first separating at point I as shown in Figure 1. The inclined guide post 7 moves in the mold opening direction under the action of the upper pad 11. Under the action of the inclined guide post 7, the upper pressure block 13, the combined slider 14, and the lower pressure block 16 move in the left and right directions. When they move to a certain distance, the push plate 15 pushes the plastic part out under the push of the equipment ejector rod. After ejection, the plastic part can be directly removed. When the mold closes, the upper pressure block 13, the combined slider 14, and the lower pressure block 16 move in the left and right directions. When they move to a certain distance, they form a molded cavity for molding the plastic part.

[0067] When designing the mold, an upper pressure block 13 is added to the upper surface of the combined slider 14, and a lower pressure block 16 is added to the lower surface. During mold opening and closing, the upper template 10 directly contacts the upper pressure block 13, and the push plate 17 directly contacts the lower pressure block 16. Therefore, the combined slider 14 (flange forming cavity) will not experience wear due to direct friction with the upper template 10 and the push plate 17, thus eliminating wear during mold opening and closing of the formed combined cavity. In other words, adding a fixed pressure block to each of the upper and lower surfaces of the combined cavity avoids friction between the push plate and the upper template and the cavity surface. This ensures that the flange forming cavity is free from wear caused by mold opening and closing, so there is less chance of flash around the flange. The flange forming cavity also has a venting function and is easy to process.

[0068] The mold structure provided in this article is used for the molding of thermoplastic parts in electromechanical components. It is particularly suitable for thermoplastic parts with flanges at both ends or one end, while requiring minimal flash on the flange edges.

[0069] This disclosure has been described with reference to the foregoing embodiments; however, these embodiments are merely examples for implementing this disclosure. It must be noted that the disclosed embodiments do not limit the scope of this disclosure. On the contrary, any changes and modifications made without departing from the spirit and scope of this disclosure are within the scope of patent protection of this disclosure.

Claims

1. A mold structure for preventing flash from forming on the edges of thermoplastic parts with flanged ends, characterized in that, The mold structure includes: The upper mold includes an upper pad (11), an upper module (10) mounted together with the upper pad (11), a wedge (8) mounted on the upper module (10), and a wedge (7). One end of the wedge (7) passes through the upper module (10) and is mounted on the upper pad (11), while the other end extends out of the upper module (10) and is suspended in the air. The middle section includes a combined slider (14), a guide slider (15), a push plate (17), and a first fixing plate (6). The mold consists of a core (18), a pad (5), an upper pressure block (13), and a lower pressure block (16). The combined slider (14) is mounted on the first fixed plate (6), and the guide slider (15) is mounted on both sides of the combined slider (14) to provide a slide rail (151) for the combined slider (14) so ​​that the combined slider (14) can move. The upper pressure block (13) and the lower pressure block (16) are respectively mounted on both sides of the combined slider (14) to ensure that the upper module (10) contacts the upper pressure block (13) and does not contact the combined slider (14) during use. The lower pressure block (16) prevents the combined slider (14) from contacting the push plate (17). The push plate (17) is mounted on the first fixed plate (6). One end of the core (18) is mounted on the first fixed plate (6), and the other end passes through the push plate (17). The pad (5) is mounted on the bottom surface of the first fixed plate (6). During the mold opening and closing process, the inclined guide post (7) is inserted into the inclined guide hole (141) on the combined slider (14), and under the action of the inclined guide post (7) and the inclined wedge (8), the combined slider (14) is pushed to drive the upper pressure block (13) and the lower pressure block (16) to move to the target position to form a molded cavity.

2. The mold structure for preventing flash from easily forming on the edges of thermoplastic parts with flanged ends, as described in claim 1, is characterized in that... Also includes: The lower mold includes a base plate (2), a pad plate (3), a second fixed plate (4), an elastic element (21), a return rod (20), a support block (19), and a push rod (22). The pad plate (3) is installed between the base plate (2) and the second fixed plate (4). The elastic element (21) is placed between the pad block (5) and the second fixed plate (4) to provide restoring force. One end of the return rod (20) and the push rod (22) are respectively installed on the second fixed plate (4), and the other end of the push rod (22) is connected to the push plate (17). The length of the return rod (20) allows the push rod (22) to return to its initial position. The support block (19) is installed between the base plate (2) and the pad block (5).

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