Mold and using method thereof

Abstract

The invention discloses a mold and a using method thereof, and relates to the technical field of molds, the mold comprises a front mold, a rear mold and a core pulling assembly, mold closing and mold opening are achieved by arranging the front mold and the rear mold, and the core pulling assembly is adopted for core pulling. A pressing base of the core pulling assembly is installed on the rear mold, an insert pin is fixedly arranged on an installation base, an elastic piece is connected with the installation base, and the installation base is in sliding connection with the pressing base. The elastic piece is adopted to drive the insert pin to move, so that the conditions of shaking, deviation and the like of the insert pin caused by the instability problem during opening of the front mold can be avoided. Due to the fact that the installation base is in sliding connection with the pressing base, the elastic piece can drive the installation base to slide along the pressing base, then the insert pin is driven to conduct core pulling from the through hole of the product, and subsequent product demolding is facilitated. The insert pin does not need to be positioned through a positioning hole formed in the rear mold, so that the problems of abrasion, breakage and the like in the matching process of the insert pin and the positioning hole are solved, the production efficiency is improved, the maintenance cost is reduced, and the product quality is ensured.

Description

Technical Field

[0001] The present invention relates to the field of mold technology, and in particular to a mold and a use method thereof. Background Art

[0002] When the side wall of the injection molded product is provided with features such as holes and grooves, it is necessary to pull the core before it can be ejected from the mold during the demolding stage. For example, the outer wall of the product is provided with two ears at intervals, and both ears are provided with through holes, and the two through holes are coaxially arranged. In the related art, by providing an inlay pin in the front mold, when the mold is closed, the inlay pin needs to be inserted into the positioning hole of the rear mold for positioning. In the mold opening stage after injection molding, it is necessary to separate the front mold and the rear mold, at which time the front mold drives the inlay pin to pull the core, and finally the ejection mechanism ejects the product from the mold. With this solution, due to problems such as manufacturing accuracy and stability during mold opening, the front mold will cause the inlay pin to shake, shift and dislocate, and the inlay pin will contact and wear with the through hole, the positioning hole of the rear mold and other parts, which can easily lead to unqualified products and broken inlay pins. The inlay pins need to be replaced frequently, with low production efficiency and high maintenance costs. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a mold that can improve the problems of easy breakage of the insert pin, low production efficiency and high maintenance cost, while also ensuring the quality of the product.

[0004] The invention also provides a method for using the mold.

[0005] According to the first aspect of the present invention, the mold of the embodiment comprises: a front mold; a rear mold, which is used to cooperate with the front mold to realize the mold closing and mold opening of the mold; a core pulling assembly, including an insert pin, a mounting seat, an elastic member and a pressure seat, the pressure seat is installed on the rear mold, the insert pin is fixedly connected to the mounting seat, the elastic member is connected to the mounting seat, and the mounting seat and the pressure seat are slidably connected; wherein, when the mold is closed, the front mold abuts against the mounting seat, and the elastic member is in a compressed state; when the mold is in the process of opening, the mounting seat slides relative to the pressure seat under the elastic force of the elastic member to pull out the insert pin.

[0006] The mold according to the embodiment of the present invention has at least the following beneficial effects:

[0007] The mold closing and mold opening are realized by setting the front mold and the rear mold, and the core pulling assembly is used for core pulling. The pressure seat of the core pulling assembly is installed on the rear mold, the inlay pin is fixed on the mounting seat, the elastic member is connected to the mounting seat, and the mounting seat and the pressure seat are slidably connected. When the mold closing is completed, the front mold and the mounting seat are abutted, and the elastic member is in a compressed state. When the mold is opened, the front mold and the rear mold are gradually separated, and the pressure on the mounting seat by the front mold is gradually reduced, and the mounting seat can drive the inlay pin to be pulled out under the elastic force of the elastic member. By using the elastic member to drive the inlay pin to move, it is possible to avoid the inlay pin from shaking, deflecting, etc. due to the instability problem when the front mold is opened. Since the mounting seat and the pressure seat are slidably connected, the elastic member can drive the mounting seat to slide along the pressure seat, and then drive the inlay pin to pull the core from the through hole of the product, which is convenient for the subsequent product to be ejected. The inlay pin does not need to be positioned through the positioning hole set in the rear mold, which improves the problems of wear and breakage of the inlay pin in the process of matching with the positioning hole, so as to improve production efficiency, reduce maintenance costs, and ensure product quality.

[0008] According to some embodiments of the present invention, the pressure seat is provided with a mounting hole, the inner wall of the mounting hole is provided with a first guide portion, the mounting seat is arranged in the mounting hole, the outer wall of the mounting seat is provided with a second guide portion, and the second guide portion and the first guide portion are slidably matched.

[0009] According to some embodiments of the present invention, the extension direction of the second guide portion and the first guide portion is the same as the sliding direction of the mounting seat, the first guide portion is a guide groove, the second guide portion is a guide protrusion, and the guide protrusion is slidably arranged in the guide groove.

[0010] According to some embodiments of the present invention, the mounting seat includes a positioning member and a seat body, one end of the seat body is provided with a mounting rod, the positioning member is arranged on the mounting rod, and the inlay pin is connected to the positioning member.

[0011] According to some embodiments of the present invention, a slot is provided at one end of the positioning member, and a locking portion is provided at one end of the inlay pin, and the locking portion is locked in the slot.

[0012] According to some embodiments of the present invention, the mounting seat includes a seat body, the seat body forms a mounting cavity, the elastic member is a nitrogen spring, the nitrogen spring is disposed in the mounting cavity, and the nitrogen spring abuts against the rear mold.

[0013] According to some embodiments of the present invention, the rear mold includes a slider, a driving assembly and a guide member, the slider is slidably arranged on the guide member, the driving assembly is drivingly connected to the slider, and the slider is equipped with the core pulling assembly.

[0014] According to some embodiments of the present invention, the slider is provided with a limiting groove, the driving assembly comprises a cylinder and a connecting member, one end of the connecting member is connected to the output end of the cylinder, and the other end of the connecting member is provided in the limiting groove.

[0015] According to the method for using the mold of the second aspect of the present invention, based on the mold described in the above embodiment, the mold further includes an ejection assembly. The method for using the mold includes:

[0016] The mold is closed, a cavity for injection molding a product is formed between the front mold and the rear mold, and the front mold is in contact with the mounting seat, so that the elastic member is in a compressed state and drives the insert pin to move toward the cavity;

[0017] The molten material is injected from the pouring system into the cavity through an injection molding machine to form a product;

[0018] The mold is opened, and the front mold and the mounting seat are separated, so that the insert pin can be pulled out in a direction away from the product under the elastic force of the elastic member;

[0019] The ejection assembly ejects the product.

[0020] The method for using the mold according to the embodiment of the present invention has at least the following beneficial effects:

[0021] By adopting the above-mentioned method of use, when the mold is closed, the front mold and the mounting seat are in contact, and the elastic member is in a compressed state. When the mold is opened, the front mold and the rear mold are gradually separated, and the pressure on the mounting seat from the front mold gradually decreases, and the mounting seat can drive the inlay pin to be pulled out under the elastic force of the elastic member. By using an elastic member to drive the movement of the inlay pin, it is possible to avoid shaking, offset, and the like of the inlay pin due to the instability problem when the front mold is opened. Since the mounting seat and the pressure seat are slidably connected, the elastic member can drive the mounting seat to slide along the pressure seat, and then drive the inlay pin to pull the core out of the through hole of the product, which is convenient for the subsequent product to be demolded. The inlay pin does not need to be positioned through the positioning hole set in the rear mold, which improves the problems of wear and breakage of the inlay pin during the cooperation with the positioning hole, so as to improve production efficiency, reduce maintenance costs, and ensure product quality.

[0022] According to some embodiments of the present invention, the rear mold includes a slider and a driving assembly, the driving assembly is drivingly connected to the slider, and the slider is equipped with the core pulling assembly;

[0023] After the inserting needle pulls out the product and before the ejection assembly ejects the product, the method further comprises: the driving assembly drives the slider and the core pulling assembly to be pulled out in a direction away from the product.

[0024] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0026] Figure 1 It is a structural schematic diagram of an injection molded product according to an embodiment of the present invention;

[0027] Figure 2 It is a schematic diagram of the overall structure of a mold according to an embodiment of the present invention;

[0028] Figure 3 It is a structural schematic diagram of a core pulling assembly according to an embodiment of the present invention;

[0029] Figure 4 It is a structural schematic diagram of a core pulling assembly after the pressing seat is hidden in one embodiment of the present invention;

[0030] Figure 5 yes Figure 4 A cross-sectional schematic diagram of a core pulling assembly in FIG.

[0031] Figure 6 is an exploded schematic diagram of a core pulling assembly according to an embodiment of the present invention;

[0032] Figure 7 1 is a bottom schematic diagram of a front mold according to an embodiment of the present invention;

[0033] Figure 8 It is a schematic structural diagram of the cooperation between the front mold core, the rear mold and the core pulling assembly in one embodiment of the present invention;

[0034] Fig. 9 It is a schematic diagram of the structure of the front mold core and the mounting seat in cooperation with one embodiment of the present invention;

[0035] Fig.10 It is a structural schematic diagram of the cooperation between a slider, a core pulling assembly and a product according to an embodiment of the present invention;

[0036] Fig.11 is a schematic structural diagram of a driving assembly according to an embodiment of the present invention;

[0037] Fig.12 is a flow chart of a method for using a mold according to an embodiment of the present invention;

[0038] Fig.13 It is a flow chart of a method for using a mold according to an embodiment of the present invention.

[0039] Reference numerals:

[0040] Mould 1000;

[0041] Front mold 100; front mold core 110; panel 120; runner plate 130; front mold foot 140; A plate 150;

[0042] rear mold 200; slider 210; limit groove 211; drive assembly 220; oil cylinder 221; connecting piece 222; guide piece 230; bottom plate 240; rear mold foot 250; B plate 260; ejector assembly 270; rear mold core 280;

[0043] The core pull assembly 300; the insert pin 310; the positioning portion 311; the mounting seat 320; the guide protrusion 321; the positioning member 322; the slot 3221; the fastener 323; the seat body 324; the mounting rod 3241; the mounting cavity 3242; the elastic member 330; the pressing seat 340; the positioning surface 341; the mounting hole 342; the guide slot 343;

[0044] Product 400; ear 410; through hole 411. DETAILED DESCRIPTION

[0045] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0046] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., and orientations or positional relationships indicated are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0047] In the description of the present invention, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood as not including the number itself, and "above", "below", "within" etc. are understood as including the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0048] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0049] When the side wall of the product 400 is provided with structures such as grooves and holes, the product 400 needs to be demolded after core pulling during the injection molding stage. Figure 1 As shown in the product 400, the side wall of the product 400 is provided with two ears 410, and the two ears 410 are provided with a through hole 411, and the through holes 411 of the two ears 410 are coaxially arranged. Before injection molding, it is usually necessary to set a needle 310 to form the through hole 411. After the injection molding is completed, the needle 310 needs to be pulled out of the through hole 411 so that the product 400 can be demoulded. However, the needle 310 in the related art is prone to breakage when being pulled out, and the needle 310 needs to be replaced frequently, which has low production efficiency and high maintenance cost.

[0050] In order to improve the problem that the insert pin 310 is easily broken, a mold 1000 according to an embodiment of the present invention can be used to produce Figure 1 The product 400 shown. It should be noted that in addition to the production Figure 1 The product 400 shown in the figure may also be a product 400 of other shapes, for example, the side wall of the product 400 may have one, three, four, or other number of holes, or may be oblique holes, blind holes, etc. The appropriate solution is selected according to the actual situation. For the convenience of explanation, the following embodiments are all based on Figure 1 The product 400 in FIG. 1 is used as an example for explanation.

[0051] Reference Figure 2 and Figure 3 As shown, a mold 1000 of an embodiment of the present invention includes a front mold 100, a rear mold 200 and a core pulling assembly 300. The front mold 100 and the rear mold 200 are arranged in the up and down direction. The front mold 100 and the rear mold 200 cooperate to achieve mold closing and mold opening of the mold 1000. Figure 4 and Figure 5 As shown, the core pulling assembly 300 includes a pin 310, a mounting seat 320, an elastic member 330 and a pressing seat 340, the pressing seat 340 is connected to the rear mold 200, the pin 310 is fixedly connected to the mounting seat 320, and the elastic member 330 is connected to the mounting seat 320. It should be noted that the front mold 100 and the rear mold 200 can also be arranged in the left-right direction, the front-back direction, etc., and the subsequent embodiments are described by taking the front mold 100 and the rear mold 200 in the up-down direction as an example.

[0052] When the product 400 needs to be injected, the mold 1000 is in a mold-closing state, at which time the front mold 100 and the rear mold 200 are connected, and a cavity for injection molding is defined between the front mold 100 and the rear mold 200. The front mold 100 also abuts against the mounting seat 320 so that the elastic member 330 is in a compressed state, and the insert pin 310 is located in the cavity. After the product 400 is formed by injection molding in the cavity, the mold 1000 can be opened. During the mold opening process, the front mold 100 and the rear mold 200 are separated, and the pressure applied by the front mold 100 on the mounting seat 320 is gradually reduced, and finally the front mold 100 and the mounting seat 320 are completely separated. In this process, the elastic force of the elastic member 330 can make the mounting seat 320 slide along the pressure seat 340, for example, the mounting seat 320 slides upward, and when the mounting seat 320 slides, it drives the insert pin 310 to be pulled out in a direction away from the through hole 411 of the product 400, thereby automatically completing the core pulling action, which is convenient for the subsequent demolding of the product 400.

[0053] By using the elastic member 330 to drive the movement of the insert pin 310, it is possible to avoid the insert pin 310 from shaking, deflecting, etc. due to the instability of the front mold 100 when opening the mold, thereby reducing the occurrence of scratches caused by the friction between the insert pin 310 and the through hole 411. Since the mounting seat 320 and the pressure seat 340 are slidably connected, the pressure seat 340 has the function of guiding the direction of the mounting seat 320, and the elastic member 330 can drive the mounting seat 320 to slide along the pressure seat 340, reducing the misalignment of the insert pin 310, which is conducive to ensuring the qualified rate of the product 400 and improving the deviation of the position of the through hole 411 during injection molding. The core pulling assembly 300 is installed on the rear mold 200 through the pressure seat 340, so the insert pin 310 does not need to be positioned through the positioning hole, further reducing the wear problem of the insert pin 310. Therefore, the insert pin 310 has high reliability, is not easy to break, has a long service life, does not need to be frequently replaced, can improve production efficiency, and reduce costs.

[0054] Reference Figure 6 As shown, in the embodiment of the present invention, the pressing seat 340 is provided with a mounting hole 342, and the inner wall of the mounting hole 342 is provided with a first guide portion. The mounting seat 320 is arranged in the mounting hole 342, and the outer wall of the mounting seat 320 is provided with a second guide portion, and the extension direction of the second guide portion is also the same as the sliding direction of the mounting seat 320. For example, the first guide portion and the second guide portion are both extended in the up-down direction. The first guide portion and the second guide portion are slidably matched to guide the mounting seat 320 to slide in the up-down direction to ensure accuracy.

[0055] Continue to refer to Figure 6As shown, in the embodiment of the present invention, the extending direction of the first guide portion and the second guide portion is the same as the sliding direction of the mounting seat 320. For example, the first guide portion may be a guide groove 343, and the second guide portion may be a guide protrusion 321, and the guide protrusion 321 is slidably connected to the guide groove 343. Through the guiding cooperation between the guide protrusion 321 and the guide groove 343, the sliding direction of the mounting seat 320 can be determined, and the structure is simple and reliable. In another embodiment, two guide protrusions 321 may be provided, and the two guide protrusions 321 are arranged at intervals along the peripheral wall of the mounting seat 320 and extend in the up-down direction; the guide grooves 343 are also provided with two guide grooves 343 and are arranged at intervals along the peripheral wall of the mounting hole 342, and the extending direction of the two guide grooves 343 is the same as the extending direction of the guide protrusion 321. The two guide protrusions 321 are correspondingly arranged in the two guide grooves 343 to limit the rotation of the mounting seat 320, improve the stability of the movement of the mounting seat 320, and avoid the situation where the setting pin 310 is misaligned due to the rotation of the mounting seat 320. It should be noted that the number of the guide protrusions 321 and the guide grooves 343 can be one or two, three, four, etc., and the appropriate setting method and number can be selected according to actual conditions.

[0056] In another embodiment, the guiding cooperation manner of the mounting seat 320 and the pressure seat 340 can also be: the first guiding part is the guiding protrusion 321, the second guiding part is the guiding groove 343, the guiding protrusion 321 and the guiding groove 343 are slidably cooperated, and can also guide the mounting seat 320 to slide along a preset direction.

[0057] Continue to refer to Figure 6 As shown, in the embodiment of the present invention, the mounting seat 320 includes a positioning member 322 and a seat body 324. The end of the seat body 324 facing the front mold 100 is provided with a mounting rod 3241, the mounting rod 3241 is connected to the positioning member 322, the positioning member 322 is connected to the insert pin 310, and the insert pin 310 and the seat body 324 are arranged at intervals. The extension direction of the insert pin 310 is the same as the extension direction of the guide groove 343 and the guide protrusion 321. Among them, the guide protrusion 321 is arranged on the outer wall surface of the seat body 324, and the seat body 324 and the guide groove 343 of the pressure seat 340 are slidably matched. The seat body 324 and the positioning member 322 are matched to drive the insert pin 310 to move, thereby improving the reliability of the movement of the insert pin 310.

[0058] Reference Figure 4 and Figure 5As shown, in an embodiment of the present invention, one end of the positioning member 322 is sleeved on the mounting rod 3241, and the mounting seat 320 also includes a fastener 323, and the positioning member 322 is fixedly connected to the mounting rod 3241 through the fastener 323 to limit the position of the positioning member 322. Further, the fastener 323 can be a nut, and the mounting rod 3241 is provided with a thread. After the positioning member 322 is sleeved on the mounting rod 3241, it is fixed by the nut, and the positioning member 322 is detachably connected to the mounting rod 3241. Therefore, when the inlay pin 310 needs to be replaced, the positioning member 322 and the inlay pin 310 can be replaced together by removing the nut, which is simple to operate and convenient to replace. In order to improve the stability of the connection, double nuts can be used for fastening. In another embodiment of the present invention, the fastener 323 can be a structure such as a sleeve with internal threads in addition to being a nut. In addition to being connected and fixed by the fastener 323, the positioning member 322 can also be connected by welding, clamping, integral molding, etc.

[0059] Reference Figure 6 As shown, in the embodiment of the present invention, a slot 3221 is provided at one end of the positioning member 322 away from the mounting rod 3241, and a clamping portion 311 is provided at one end of the insert pin 310, and the clamping portion 311 is clamped with the slot 3221, so that the positioning member 322 and the insert pin 310 are detachably connected. When the insert pin 310 needs to be replaced, the insert pin 310 can be removed from the positioning member 322, and the operation is simple and convenient. Further, the slot 3221 is a structure formed by an inward depression at one end of the positioning member 322, and the clamping portion 311 is a structure formed by a depression of the side wall of the insert pin 310, and the clamping portion 311 is clamped with the slot 3221, which can limit the rotation of the insert pin 310. In another embodiment of the present invention, the way of connecting the insert pin 310 and the positioning member 322 can be connected by the clamping portion 311 and the slot 3221, or by welding, screw connection, riveting, etc.

[0060] It should be noted that, in order to facilitate the replacement of the insert pin 310, in addition to the detachable connection between the positioning member 322 and the insert pin 310 and the detachable connection between the positioning member 322 and the mounting rod 3241, the insert pin 310 and the mounting seat 320 can be replaced as a whole, or the entire core pulling assembly 300 can be replaced with a new one. The appropriate solution can be selected according to the actual situation.

[0061] Reference Figure 5As shown, in the embodiment of the present invention, a mounting cavity 3242 is formed inside the seat body 324, and an end of the seat body 324 away from the mounting rod 3241 is provided with an opening connected to the mounting cavity 3242. The elastic member 330 is a spring, which is arranged in the mounting cavity 3242. One end of the spring can protrude from the opening of the seat body 324 and abut against the rear mold 200. Therefore, when the front mold 100 abuts against the seat body 324, the spring can be compressed, and the seat body 324 drives the inlay pin 310 to move downward, which is convenient for injection molding of the product 400.

[0062] Further, refer to Figure 6 As shown, in the embodiment of the present invention, the spring can be a nitrogen spring. The nitrogen spring is an elastic component with high-pressure nitrogen as the working medium. The nitrogen spring has the advantages of small size, large elastic force, long stroke, stable operation, long service life, and gentle elastic curve. It can also simplify the installation and adjustment of the mold 1000, extend the service life of the mold 1000, and ensure the stability of the quality of the product 400. It can be understood that the shape of the installation cavity 3242 is compatible with the shape of the nitrogen spring. When the mold 1000 is closed, the upper ends of the front mold 100 and the seat body 324 are abutted, and the lower end of the nitrogen spring is abutted against the rear mold 200, so that the nitrogen spring is in a compressed state. When the mold 1000 is opened, the front mold 100 and the seat body 324 are separated, and the elastic force of the nitrogen spring causes the seat body 324 to move upward, and the seat body 324 moves upward while driving the insert pin 310 to pull the core.

[0063] In another embodiment of the present invention, the spring may also be a coil spring, and the coil spring may also be arranged in the installation cavity 3242, and one end of the coil spring protrudes from the opening of the seat body 324. It should be noted that, in addition to using the installation cavity 3242 to install the coil spring, the seat body 324 may also be provided with a guide rod at one end of the seat body 324 away from the installation rod 3241, and the coil spring is sleeved on the guide rod, with one end of the coil spring abutting against one end of the seat body 324, and the other end of the coil spring abutting against the rear mold 200. With this solution, the core pulling of the insert pin 310 can also be achieved, and the appropriate solution is selected according to the actual situation.

[0064] Reference Figure 8As shown, in the embodiment of the present invention, the rear mold 200 includes a slider 210, a driving assembly 220 and a guide member 230. The slider 210 is slidably disposed on the guide member 230. The driving assembly 220 and the slider 210 are drivingly connected to drive the slider 210 to slide along the guide member 230. The core pulling assembly 300 is disposed on the slider 210. When the driving assembly 220 drives the slider 210 to slide, the slider 210 can drive the core pulling assembly 300 to be pulled out together. Therefore, the mold 1000 adopts a secondary core pulling method to facilitate product demolding. The first core pulling is when the front mold 100 and the rear mold 200 are separated, and the pin 310 is pulled out under the action of the elastic member 330; the second core pulling is when the slider 210 is driven by the driving assembly 220 to be pulled out in a direction away from the product 400.

[0065] Reference Fig.10 and Fig.11 As shown, in an embodiment of the present invention, the slider 210 is provided with a limiting groove 211, for example, the limiting groove 211 is T-shaped, and the driving assembly 220 includes a cylinder 221 and a connecting member 222, one end of the connecting member 222 is connected to the output end of the cylinder 221, and the other end of the connecting member 222 is provided with a T-block, and the T-block is arranged in the limiting groove 211. Therefore, when the cylinder 221 is actuated, the slider 210 can be driven to move through the connecting member 222 to complete the secondary core pulling. It should be noted that the shape of the limiting groove 211 can be not only T-shaped, but also L-shaped, or an irregular shape, and the other end of the connecting member 222 is provided with a connecting block corresponding to the shape of the limiting groove 211.

[0066] In another embodiment, in addition to using the oil cylinder 221 to drive the slider 210 to move, it can also be driven by a pneumatic cylinder, an electric cylinder, a motor, etc. For example, when a motor is used, a gear can be set at the output end of the motor, and a rack is set on the slider 210, and the gear is used to drive the rack to drive the slider 210 to move.

[0067] Reference Figure 2 and Figure 7 As shown, in an embodiment of the present invention, the front mold 100 includes a front mold core 110, a panel 120, a runner plate 130, a front mold 100 foot and an A plate 150, the panel 120 is connected to the upper end of the runner plate 130, the front mold 100 foot is arranged at the lower end of the runner plate 130, and the A plate 150 is connected to the front mold 100 foot. A cavity is formed between the A plates 150, and the front mold core 110 is arranged in the cavity. The panel 120 can be connected to an injection molding machine, and a runner is formed in the runner plate 130, which can deliver the molten material to the nozzles at each injection point. The front mold core 110 is one of the most precisely processed parts of the mold 1000, and is mainly used to form the shape and appearance of the product 400.

[0068] Reference Figure 2 and 8As shown, in an embodiment of the present invention, the rear mold 200 further includes a rear mold core 280, a B plate 260, a bottom plate 240, a rear mold 200 foot, and an ejection assembly 270. The rear mold 200 foot is connected between the bottom plate 240 and the B plate 260, and the bottom plate 240 is located below the B plate 260. A cavity for installing the rear mold core 280 is formed between the B plates 260, and the ejection assembly 270 is penetrated through the bottom plate 240. The rear mold core 280 is one of the most precisely processed parts of the mold 1000, and is mainly used to form the outer shape and inner side of the product 400. When the product 400 needs to be ejected from the mold, the ejection assembly 270 ejects the product 400 to complete the ejection.

[0069] Reference Figure 8 and Fig. 9 As shown, in the embodiment of the present invention, when the mold 1000 is closed, the front mold core 110 and the upper end of the mounting seat 320 abut against each other, thereby compressing the nitrogen spring. Fig.10 As shown, after the mounting seat 320 loses the pressure applied by the front mold core 110, one end of the mounting seat 320 protrudes out of the pressure seat 340 under the elastic force of the nitrogen spring.

[0070] Reference Fig.12 As shown, a method for using a mold according to an embodiment of the present invention, the mold is the mold 1000 of the above embodiment. The method for using the embodiment of the present invention, based on the mold 1000 of the above embodiment, comprises the following steps:

[0071] Step S1201: The mold 1000 is closed, and a cavity for the injection molding product 400 is formed between the front mold 100 and the rear mold 200. The front mold 100 and the mounting seat 320 are in contact, so that the elastic member 330 is in a compressed state, and the insert pin 310 is driven to move toward the cavity. It should be noted that a release agent can be applied to the front mold core 110 and the rear mold core 280 before closing the mold, so as to facilitate the subsequent demolding of the product 400.

[0072] Step S1202: The molten material is injected into the mold cavity from the pouring system through the injection molding machine to form the product 400. After injection molding, the molten material can be cooled naturally to form the product 400, or the cooling system can be used to accelerate the cooling of the molten material, thereby improving the molding efficiency of the product 400.

[0073] Step S1203: The mold 1000 is opened, and the front mold 100 and the mounting seat 320 are separated, so that the insert pin 310 is pulled out in a direction away from the product 400 under the elastic force of the elastic member 330. The core pulling of the insert pin 310 is achieved by the elastic force of the elastic member 330, so the core pulling assembly 300 has a simple structure, a reasonable and reliable design, and can improve the stability of the insert pin 310 when pulling out the core.

[0074] Step S1204: The ejection assembly 270 ejects the product 400, and the product 400 is ejected from the mold. After the product 400 is ejected from the mold, it can be collected and stored, or enter the next process.

[0075] By adopting the above method, the insert pin 310 is driven by the elastic member 330, which can avoid the insert pin 310 from shaking, deflecting, etc. due to the instability problem when the front mold 100 is opened, thereby reducing the situation where the insert pin 310 rubs against the through hole 411 and causes scratches. Since the mounting seat 320 and the pressure seat 340 are slidably connected, the pressure seat 340 has the function of guiding the direction of the mounting seat 320, and the elastic member 330 can drive the mounting seat 320 to slide along the pressure seat 340, reducing the misalignment of the insert pin 310, which is conducive to ensuring the qualified rate of the product 400 and improving the deviation of the position of the through hole 411 during injection molding. The core pulling assembly 300 is installed on the rear mold 200 through the pressure seat 340, so the insert pin 310 does not need to be positioned through the positioning hole, further reducing the wear problem of the insert pin 310. Therefore, the insert pin 310 has high reliability, is not easy to break, has a long service life, does not need to be frequently replaced, can improve production efficiency, and reduce costs. In some embodiments, the product 400 can be ejected after the pin 310 is pulled out, that is, the product 400 can be ejected only after a core pulling process. However, in other embodiments, the product 400 can also be ejected after a second core pulling process.

[0076] Reference Fig.13 As shown, in the embodiment of the present invention, the method for using the mold 1000 further includes between step S1203 and step S1204:

[0077] Step S1301: The driving assembly 220 drives the slider 210 and the core pulling assembly 300 to be pulled out in a direction away from the product 400. The pin 310 is pulled out under the elastic force of the elastic member 330 as a primary core pulling, and the slider 210 is pulled out under the drive of the driving assembly 220 as a secondary core pulling. By adopting the secondary core pulling method, the product 400 can be demolded smoothly, so the structural design of the mold 1000 is reasonable and reliable.

[0078] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A mold, characterized in that: include: front mold; A rear mold, used for cooperating with the front mold to realize mold closing and mold opening of the mold; The core pulling assembly comprises an insert pin, a mounting seat, an elastic member and a pressure seat, wherein the pressure seat is mounted on the rear mold, the insert pin is fixedly connected to the mounting seat, the elastic member is connected to the mounting seat, and the mounting seat is slidably connected to the pressure seat; Among them, when the mold is closed, the front mold abuts against the mounting seat and the elastic member is in a compressed state; when the mold is in the process of opening, the mounting seat slides relative to the pressure seat under the elastic force of the elastic member to pull out the insert pin.

2. The mold according to claim 1, characterized in that: The pressure seat is provided with a mounting hole, the inner wall of the mounting hole is provided with a first guide portion, the mounting seat is arranged in the mounting hole, the outer wall of the mounting seat is provided with a second guide portion, and the second guide portion and the first guide portion are slidably matched.

3. The mold according to claim 2, characterized in that: The extension direction of the second guide portion and the first guide portion is the same as the sliding direction of the mounting seat, the first guide portion is a guide groove, the second guide portion is a guide protrusion, and the guide protrusion is slidably arranged in the guide groove.

4. The mold according to claim 1, characterized in that: The mounting seat comprises a positioning member and a seat body, one end of the seat body is provided with a mounting rod, the positioning member is arranged on the mounting rod, and the inlay pin is connected to the positioning member.

5. The mold according to claim 4, characterized in that: A clamping groove is provided at one end of the positioning piece, and a clamping portion is provided at one end of the inlay pin, and the clamping portion is clamped in the clamping groove.

6. The mold according to claim 1, characterized in that: The mounting seat comprises a seat body, the seat body is formed with a mounting cavity, the elastic member is a nitrogen spring, the nitrogen spring is arranged in the mounting cavity, and the nitrogen spring abuts against the rear mold.

7. The mold according to claim 1, characterized in that: The rear mold includes a slider, a driving assembly and a guide member. The slider is slidably arranged on the guide member. The driving assembly is drivingly connected to the slider. The slider is equipped with the core pulling assembly.

8. The mold according to claim 7, characterized in that: The slide block is provided with a limiting groove, and the driving assembly comprises an oil cylinder and a connecting member, one end of the connecting member is connected to the output end of the oil cylinder, and the other end of the connecting member is arranged in the limiting groove.

9. A method for using the mold, characterized in that: The mold is the mold according to any one of claims 1 to 8, and the mold further includes an ejection assembly, and the method of using the mold includes: The mold is closed, a cavity for injection molding a product is formed between the front mold and the rear mold, and the front mold is in contact with the mounting seat, so that the elastic member is in a compressed state and drives the insert pin to move toward the cavity; The molten material is injected from the pouring system into the cavity through an injection molding machine to form a product; The mold is opened, and the front mold and the mounting seat are separated, so that the insert pin can be pulled out in a direction away from the product under the elastic force of the elastic member; The ejection assembly ejects the product.

10. The method for using the mold according to claim 9, characterized in that: The rear mold includes a slider and a driving assembly, the driving assembly is drivingly connected to the slider, and the slider is equipped with the core pulling assembly; After the inserting needle extracts the product and before the ejection assembly ejects the product, the method further comprises: The driving assembly drives the slider and the core pulling assembly to be pulled out in a direction away from the product.

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