High-efficiency rear mold core-pulling mechanism

Abstract

The utility model relates to the technical field of mold manufacturing, and particularly discloses a high-efficiency rear mold core-pulling mechanism which comprises a front mold, a rear mold and a synchronizing device, the rear mold comprises a rear mold plate, a bearing plate, an equal-height screw, an ejector pin panel, an ejector pin bottom plate, a groove and a through hole, and the synchronizing device comprises a synchronous push rod, a synchronous fixing block and a synchronous buckling machine; wherein the equal-height screw penetrates through a through hole of the rear mold plate to be in threaded connection with the bearing plate, the synchronous push rod is fixedly connected with the two ends of the ejector pin panel and the ejector pin bottom plate through threads, the synchronous fixing block is connected with the bearing plate through threads, and the synchronous buckling machine is installed in grooves in the two ends of the rear mold plate and can move in the grooves. Through multi-aspect structural improvement design including arrangement of the synchronizing device, improvement of the rear mold plate and the base plate and introduction of the equal-height screws with the limiting function, the rear mold core-pulling mechanism can adapt to complex product structures, the core-pulling precision and efficiency are improved, the mold cost is reduced, maintenance is easy, and the urgent requirements of the injection molding industry can be met.

Description

Technical Field

[0001] This utility model relates to the field of mold manufacturing technology, specifically to a high-efficiency rear mold core-pulling structure for plastic molds. Background Technology

[0002] In the mold manufacturing industry, the design and production process of plastic molds play a decisive role in the quality and production efficiency of plastic products. The rear mold core-pulling mechanism, as a key component of plastic molds, directly affects the molding quality of the product and the service life of the mold.

[0003] Early plastic mold core-pulling technology was relatively simple, mostly employing a single core-pulling method, which was unable to handle plastic products with complex structures. For example, in the production of small plastic toys, due to the simple undercut structure on the toys, traditional core-pulling mechanisms, relying on simple sliders, often resulted in damage to the undercut area during core pulling, leading to obvious defects in the product's appearance and a scrap rate as high as 10%-15%. This not only increased production costs but also severely impacted production efficiency due to frequent rework of defective products.

[0004] With technological advancements and diversified market demands, the structure of plastic products has become increasingly complex. Taking the production of plastic parts for automotive interiors as an example, these products exhibit complex features such as multiple undercuts and irregularly shaped protrusions. When using traditional core-pulling mechanisms, problems become increasingly apparent. Incomplete core pulling leads to partial failure to demold, while forced demolding causes severe product deformation, resulting in a scrap rate soaring to 20%-30%. This not only significantly increases production costs for companies but also damages their cooperative relationships with automakers due to the inability to deliver qualified products on time.

[0005] To address these issues, several improved core-pulling technologies have emerged in the industry. For example, some molds utilize hydraulically driven core-pulling devices to improve stability and precision. However, when producing electronic device housings with intricate internal structures, these improvements merely address the existing structure, failing to fundamentally solve the core-pulling challenges of complex products. While reducing product damage to some extent, the complexity of the hydraulic system increases mold manufacturing costs and significantly enhances maintenance difficulty. In case of malfunction, lengthy repair times severely impact production schedules. Furthermore, existing core-pulling mechanisms are inadequate in their coordination with other mold components, hindering efficient and stable production cycles. Utility Model Content

[0006] The purpose of this utility model is to provide a high-efficiency rear mold core-pulling mechanism. Through various structural improvements, including the installation of a synchronization device and improvements to the rear template and base plate, and the introduction of equal-height screws with limiting functions, the rear mold core-pulling mechanism can adapt to complex product structures, improve core-pulling accuracy and efficiency, reduce mold costs, and is easy to maintain, thereby meeting the urgent needs of the injection molding industry.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] A high-efficiency rear mold core-pulling mechanism includes a front mold, a rear mold, and a synchronization device. The rear mold includes a rear template, a support plate, equal-height screws, an ejector plate, an ejector base plate, grooves, and through holes. The synchronization device includes a synchronization push rod, a synchronization fixing block, and a synchronization fastener. The equal-height screws pass through the through holes of the rear template and are threadedly connected to the support plate. The synchronization push rods are threadedly connected to both ends of the ejector plate and the ejector base plate. The synchronization fixing block is threadedly connected to the support plate. The synchronization fasteners are installed in the grooves at both ends of the rear template and can move within them.

[0009] There is a gap between the concave surface of the through hole and the lower part of the head of the equal-height screw, and there are 4 through holes and 4 equal-height screws.

[0010] A compression spring is provided between the synchronous buckle and the groove, and a concave hole is provided at the contact end of the synchronous buckle and the compression spring; one end of the compression spring is inserted into the concave hole to play a fixing role, and the other end is in contact with the bottom end face of the groove.

[0011] The upper end of the synchronous buckle machine is provided with a synchronous buckle machine inclined surface, which extends out of the groove. The distance between the end face of the synchronous buckle machine concave hole and the bottom of the groove is greater than the distance of the synchronous buckle machine inclined surface extending out of the groove.

[0012] The synchronous fixing block has a guide groove in the middle that matches the synchronous push rod, and the upper end of the synchronous fixing block has an inclined surface. The end of the guide groove near the support plate has a screw hole.

[0013] The rear mold also includes a core-pulling insert, a return pin, a reset block, and a reset spring. The core-pulling insert is embedded inside the support plate. The return pin and the reset block are movably embedded above the rear mold plate. The reset spring is placed on the four guide pillars of the ejector plate.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] 1. The high-efficiency rear mold core-pulling mechanism provided by this utility model, through various structural improvements, including the setting of a synchronization device and improvements to the rear template and base plate, and the introduction of equal-height screws with limiting function, enables the rear mold core-pulling mechanism to adapt to complex product structures, improve core-pulling accuracy and efficiency, reduce mold costs and facilitate maintenance, and can meet the urgent needs of the injection molding industry.

[0016] 2. In this utility model, when the product is molded, the synchronous device lifts the mold plate by 10mm and is then limited by the equal height screw, thereby allowing the product to separate from the core-pulling insert fixed on the support plate. This achieves the effect of core-pulling in areas with greater product clamping force. Then, the ejector plate continues to move, allowing the ejector pin to eject the product, avoiding problems such as whitening, deformation, and rotting of the product. This ensures both the appearance and quality of the injection molded product, extends the mold life, and reduces mold maintenance costs.

[0017] 3. By setting up a method of first pulling out the core and then ejecting it, this utility model effectively solves the problems of whitening, deformation, and rotting during product ejection, and significantly improves the appearance quality and pass rate of the product.

[0018] 4. By reducing the impact of the product on the mold, the service life of the mold is extended, and the maintenance frequency and cost of the mold are reduced.

[0019] 5. The structure of this utility model is reasonable, and the components work together to improve the production efficiency of plastic products, enhance product quality and competitiveness in the market. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall external structure of the rear mold core-pulling structure in an embodiment of this utility model;

[0021] Figure 2 This is a schematic diagram of the overall cross-sectional structure of the rear mold core-pulling structure in the mold-closing state in an embodiment of this utility model.

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the product in the mold parting state of the rear mold core-pulling structure in an embodiment of this utility model.

[0023] Figure 4 This is a schematic diagram of the ejection cross-sectional structure of the product in the mold parting state of the rear mold core-pulling structure in this embodiment of the present invention;

[0024] Figure 5 This is a partially enlarged cross-sectional view of the rear mold core-pulling structure in the mold closing state in an embodiment of this utility model.

[0025] Figure 6 This is a schematic diagram of the overall structure of the rear mold portion of the rear mold core-pulling structure in an embodiment of this utility model;

[0026] Figure 7 This is a schematic diagram of the side structure of the rear mold portion of the rear mold core-pulling structure in an embodiment of this utility model;

[0027] Figure 8 This is a cross-sectional schematic diagram of the overall structure of the rear mold portion of the rear mold core-pulling structure in an embodiment of this utility model;

[0028] Figure 9 This is a cross-sectional schematic diagram of the synchronization device structure of the rear mold part of the rear mold core-pulling structure in an embodiment of this utility model.

[0029] Figure 10 This is a cross-sectional schematic diagram of the synchronous buckle structure in the synchronous device of the rear mold part of the rear mold core pulling structure in this embodiment of the utility model.

[0030] Figure 11 This is a schematic diagram of the synchronization fixing block structure in the synchronization device of the rear mold part of the rear mold core pulling structure in this embodiment of the utility model.

[0031] Figure 12 This is a schematic diagram of the front structure of the synchronous buckle mechanism in the synchronous device of the rear mold core-pulling structure in this embodiment of the present invention.

[0032] Figure 13 This is a schematic diagram of the back structure of the synchronous buckle in the synchronous device of the rear mold part of the rear mold core pulling structure in this embodiment of the utility model.

[0033] Figure 14 This is a schematic diagram of the synchronous push rod structure in the synchronous device of the rear mold part of the rear mold core-pulling structure in this utility model embodiment;

[0034] In the diagram: 1. Front mold; 2. Rear mold; 201. Rear template; 202. Support plate; 203. Equal height screw; 204. Core-pulling insert; 205. Ejector plate; 206. Ejector base plate; 207. Return spring; 208. Return pin; 209. Return block; 210. Groove; 211. Through hole; 3. Synchronizing device; 301. Synchronizing push rod; 302. Synchronizing fixing block; 3021. Guide groove for synchronous fixing block; 3022. Inclined surface of synchronous fixing block; 303. Synchronizing latch; 3031. Inclined surface of synchronous latch; 3032. Concave hole. Detailed Implementation

[0035] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0036] Please see Figures 1-14 The high-efficiency rear mold core-pulling mechanism provided by this utility model includes a front mold 1, a rear mold 2, and a synchronization device 3. The rear mold 2 includes a rear template 201, a support plate 202, an equalizing screw 203, an ejector plate 205, an ejector base plate 206, a groove 210, and a through hole 211. The synchronization device 3 includes a synchronization push rod 301, a synchronization fixing block 302, and a synchronization latch 303. The equalizing screw 203 passes through the through hole 211 of the rear template 201 and is threadedly connected to the support plate 202. The synchronization push rod 301 is fixed to both ends of the ejector plate 205 and the ejector base plate 206 by threaded connection. The synchronization fixing block 302 is threadedly connected to both ends of the support plate 202. The synchronization latch 303 is installed in the grooves 210 at both ends of the rear template 201 and can move (rotate) in the grooves 210.

[0037] There is a gap between the concave surface of the through hole 211 and the lower part of the head of the equal-height screw 203. There are four through holes 211 and four equal-height screws 203. A compression spring is provided between the synchronous fastener 303 and the groove 210. The contact end of the synchronous fastener 303 and the compression spring is provided with a concave hole 3032. One end of the compression spring is inserted into the concave hole 3032 for fixing, while the other end contacts the bottom surface of the groove 210. The upper end of the synchronous fastener 303 is provided with a synchronous fastener inclined surface 3031, which extends out of the groove 210. The distance between the end face of the concave hole 3032 of the synchronous fastener 303 and the bottom of the groove 210 is greater than that of the synchronous fastener. The distance by which the inclined surface of 303 extends beyond the groove 210; the synchronous fixing block 302 is provided with a guide groove 3021 in the middle that matches the synchronous push rod 301, the upper end of the synchronous fixing block 302 is provided with an inclined surface 3022, and the end of the guide groove 3021 near the support plate 202 is provided with a screw hole; the rear mold 2 further includes a core-pulling insert 204, a return pin 208, a reset block 209 and a reset spring 207, the core-pulling insert 204 is embedded (fixed) inside the support plate 202, the return pin 208 and the reset block 209 are embedded (movable) above the rear mold plate 201, and the reset spring 207 is placed on the four guide posts of the ejector plate 205.

[0038] The working principle of this utility model is as follows:

[0039] During the injection molding process, when the mold is being separated, the synchronization device 3 moves together with the ejector plate 205 and the ejector base plate 206. The rear template 201 has a through hole 211 reserved for the equalizing screw 203. In the mold-closed state, there is a 10mm gap between the rear template 201 and the head of the equalizing screw 203. The synchronization push rod 301 moves upward along the guide groove 3021 of the synchronization fixing block and pushes up the synchronization buckle 303 connected by a spring in the groove 210 of the rear template 201, thereby moving the rear template 201 by 10mm. Then, the equalizing screw 203 fixed by the support plate 202 is limited, allowing the injection molded product to separate from the core-pulling insert 204 fixed to the support plate 202. At this time, the rear template 201 and the support plate 202 will separate by 10mm, achieving a high-efficiency and precise core-pulling effect.

[0040] The top of the synchronous buckle 303 and the synchronous fixing block 302 are also provided with a sloping guide design. The sloping surface 3031 of the synchronous buckle and the sloping surface 3022 of the synchronous fixing block cooperate with each other. When the synchronous push rod 301 moves along the guide groove 3021 of the synchronous fixing block to lift the synchronous buckle 303 and thus lift the rear template 201 to move (move) 10mm, the rear template 201 will no longer move due to the limit of the equal height screw 203 fixed on the support plate 202. However, the push rod continues to push the ejector plate 205 and the ejector base plate 206. 01 also moves together. Under the force of the push rod, the synchronous push rod 301 lifts the synchronous buckle 303. The inclined surface 304 of the synchronous fixing block contacts the inclined surface 305 of the synchronous buckle. Under the pushing force of the synchronous push rod 301 and the guiding action of the two inclined surfaces, the spring in the concave hole 3032 of the synchronous buckle 303 continues to compress, allowing the space reserved in the groove 210 of the rear template 201 of the synchronous buckle 303 to retract. This allows the ejector plate 205, the ejector base plate 206 and the synchronous push rod 301 to continue moving, so that the ejector pin ejects the core-pulled injection molded product.

[0041] During mold closing, the ejector pins of the injection molding machine retract, and the return spring 207 on the ejector plate panel 205 returns to the pre-compression state. At this time, the ejector plate 205, the ejector base plate 206, and the return pin 208 are reset. The synchronous push rod 301 retracts along with the ejector plate 205 and the ejector base plate 206. The synchronous buckle 303 is pushed back to the original ejection state by the retraction of the synchronous push rod 301. The reset block 209 on the rear mold plate 201 also pulls the rear mold plate 201 back to the reset state. The front mold 1 and the rear mold 2 merge and return to the initial mold closing state.

[0042] The above-described embodiments of this utility model mainly improve the design of various structures, including the setting of a synchronization device and the improvement of the rear template and base plate, and the introduction of equal-height screws with limiting function. This enables the rear mold core pulling mechanism to adapt to complex product structures, improve core pulling accuracy and efficiency, ensure product appearance and quality, extend mold life, reduce mold costs and facilitate maintenance, and better meet the urgent needs of the injection molding industry.

[0043] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is limited by the appended claims and their equivalents.

Claims

1. A high-efficiency rear mold core-pulling mechanism, characterized in that: The device includes a front mold (1), a rear mold (2), and a synchronization device (3). The rear mold (2) includes a rear template (201), a support plate (202), an equal-height screw (203), an ejector plate (205), an ejector base plate (206), a groove (210), and a through hole (211). The synchronization device (3) includes a synchronization push rod (301), a synchronization fixing block (302), and a synchronization fastener (303). The equal-height screw (203) passes through the through hole (211) of the rear template (201) and is threadedly connected to the support plate (202). The synchronization push rod (301) is threadedly connected to both ends of the ejector plate (205) and the ejector base plate (206). The synchronization fixing block (302) is threadedly connected to the support plate (202). The synchronization fastener (303) is installed in the grooves (210) at both ends of the rear template (201) and can move therein.

2. The rear mold core-pulling mechanism according to claim 1, characterized in that: There is a gap between the concave surface of the through hole (211) and the lower part of the head of the equal height screw (203), and there are 4 through holes (211) and 4 equal height screws (203).

3. The rear mold core-pulling mechanism according to claim 1, characterized in that: A compression spring is provided between the synchronous buckle (303) and the groove (210), and a recessed hole (3032) is provided at the contact end of the synchronous buckle (303) and the compression spring; one end of the compression spring is inserted into the recessed hole (3032) for fixation, and the other end is in contact with the bottom surface of the groove (210).

4. The rear mold core-pulling mechanism according to claim 3, characterized in that: The upper end of the synchronous buckle (303) is provided with a synchronous buckle inclined surface (3031), which extends out of the groove (210). The distance between the end face of the concave hole (3032) of the synchronous buckle (303) and the bottom of the groove (210) is greater than the distance of the synchronous buckle (303) inclined surface extending out of the groove (210).

5. The rear mold core-pulling mechanism according to claim 1, characterized in that: The synchronous fixing block (302) is provided with a synchronous fixing block guide groove (3021) in the middle that matches the synchronous push rod (301). The synchronous fixing block (302) is provided with a synchronous fixing block inclined surface (3022) at the upper end. The synchronous fixing block guide groove (3021) is provided with a screw hole at one end near the support plate (202).

6. The rear mold core-pulling mechanism according to claim 1, characterized in that: The rear mold (2) also includes a core-pulling insert (204), a return pin (208), a reset block (209), and a reset spring (207); the core-pulling insert (204) is embedded and fixed inside the support plate (202), the return pin (208) and the reset block (209) are embedded above the rear template (201), and the reset spring (207) is set on the four guide pillars of the ejector plate (205).

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