A mold core positioning device for injection mold production

Abstract

The utility model discloses a kind of mould core positioning devices for injection mould production, including lower die holder, the inside of lower die holder is installed with panel, the top of panel is engaged and connected with injection mould cavity, the inside of lower die holder is installed with ejector pin, one end of ejector pin is fixedly connected with ejector pin fixed plate, the top of ejector pin fixed plate is fixedly connected with ejector pin guide rod, the outside of ejector pin guide rod is provided with reset spring, the upper portion of injection mould cavity is installed with upper die, the inside of upper die is embeddedly installed with die guide rod, the inside of injection mould cavity is installed with positioning assembly. The utility model provides a kind of mould core positioning devices for injection mould production, and the accurate correction and positioning of mould core are realized by positioning assembly, the cooperation of correcting frame, top rod and correcting spring can carry out preliminary correction to mould core positioning block, the contact of roller and arc-shaped groove and the cooperation of wedge-shaped positioning pin and wedge-shaped hole further improve positioning accuracy.

Description

Technical Field

[0001] This utility model relates to the field of injection mold production technology, specifically to a mold core positioning device for injection mold production. Background Technology

[0002] In the utility model patent application CN212603109U, published on February 26, 2021, entitled "An Injection Mold with Replaceable Mold Cores," this utility model relates to an injection mold with replaceable mold cores, including a hot runner system, a mold core system, a cooling system, an ejection system, and side locks, guide sleeves, guide pillars, and positioning connection devices. The mold core system includes a front mold core and a rear mold core assembly; the rear mold core assembly includes a rear mold core portion and a fixed-shape connection part; the ejection system is provided with a rear mold core base, and the upper end of the rear mold core base is provided with two fixed-shape connection parts; the connection part and the connection parts are detachably connected; a fixed-shape front mold core hole is provided on the template of the front mold core, and the outer contour of the front mold core mates with the front mold core hole; a fixed-shape rear mold core assembly hole is provided on the template of the rear mold core assembly, and the outer contour of the rear mold core assembly mates with the rear mold core assembly hole. The advantage of this invention is that it only requires changing the mold core system to produce different products, without changing the template and other systems, which greatly reduces mold costs and shortens the mold manufacturing cycle.

[0003] In the prior art, including the aforementioned patents, injection molds are crucial in the production of plastic products. The positioning accuracy of the mold core directly affects the dimensional accuracy, appearance quality, and mold life. Traditional positioning devices are prone to positioning deviations due to assembly errors, stress deformation, etc., leading to problems such as flash, material shortages, and inconsistent dimensions. Furthermore, low heat dissipation efficiency can affect production cycles and product performance. Therefore, it is necessary to design a high-precision, stable, and efficient heat dissipation mold core positioning device. Utility Model Content

[0004] The purpose of this invention is to provide a mold core positioning device for injection mold production, so as to solve the problem of achieving high-precision positioning of the mold core and reducing positioning deviation mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a mold core positioning device for injection mold production, comprising a lower mold base, a panel installed inside the lower mold base, an injection mold cavity engaged with the top of the panel, an ejector pin installed inside the lower mold base, an ejector pin fixing plate fixedly connected to one end of the ejector pin, an ejector pin guide rod fixedly connected to the top of the ejector pin fixing plate, a return spring provided outside the ejector pin guide rod, an upper mold installed above the injection mold cavity, a mold guide rod fitted inside the upper mold, and a positioning component installed inside the injection mold cavity.

[0006] Furthermore, a positioning ring is embedded in the top of the upper mold, and a heat dissipation component is installed on the outer wall of the injection mold cavity.

[0007] Furthermore, the positioning assembly includes a straightening frame, an ejector rod, a straightening spring, a mold core positioning block, rollers, and wedge-shaped positioning pins. The straightening frame is installed on the outer wall of the injection mold cavity, and an ejector rod is installed through the inside of the straightening frame. A straightening spring is installed on the outer wall of the ejector rod. The mold core positioning block is engaged with the inside of the injection mold cavity. Rollers are installed at the bottom of the upper mold, and wedge-shaped positioning pins are installed at the bottom of the upper mold.

[0008] Furthermore, the inner wall of the correction frame is provided with a guide groove that matches the push rod, and the side wall of the mold core positioning block is provided with another guide groove that matches the push rod.

[0009] Furthermore, the top of the mold core positioning block is provided with an arc-shaped groove that matches the roller, the outer surface of the roller is plated with a hard chrome layer, and the interior of the mold core positioning block is provided with a wedge-shaped hole that mates with the wedge-shaped positioning pin.

[0010] Furthermore, the heat dissipation assembly includes cooling water channels, threaded pipe joints, and nuts arranged around the outer wall of the injection mold cavity. The inlet and outlet of the cooling water channels are both equipped with threaded pipe joints, which are located on both sides of the injection mold cavity and are connected to the external cooling system through the pipe joints. Nuts are installed on the threads of the outer wall of the threaded pipe joints.

[0011] Furthermore, multiple sets of mold guide rods are provided between the upper mold and the injection mold cavity, and the panel and the lower mold base are connected by hexagonal head screws.

[0012] Compared with the prior art, the beneficial effects of this utility model are: the mold core positioning device for injection mold production is reasonable and has the following advantages:

[0013] (1) This utility model achieves high-precision correction and positioning of the mold core through a precision-designed positioning component. In actual operation, the correction frame serves as the basic support structure, and together with the ejector rod and the correction spring, it forms an elastic correction system that can perform adaptive preliminary correction of the mold core positioning block. After the mold core is placed, the pre-tightening force provided by the correction spring can effectively offset the assembly error and make the positioning block quickly return to the initial position. At the same time, the line contact design between the roller and the arc groove uses rolling friction instead of sliding friction to reduce wear and achieve fine adjustment without dead angles. The precise fit between the wedge positioning pin and the wedge hole, through the self-locking characteristics of the wedge mechanism, can control the positioning error. This multi-dimensional and phased positioning mechanism not only significantly improves the accuracy of mold core installation, but also fundamentally ensures the stability of the mold during the injection molding process, effectively reducing quality problems such as product size deviation and flash caused by positioning deviation, and providing a reliable guarantee for the production of high-quality injection molded products.

[0014] (2) This utility model has a cooling water channel in the heat dissipation component that surrounds the outer wall of the injection mold cavity, which can increase the heat dissipation area and improve the heat dissipation efficiency. The coolant enters and exits the cooling water channel through the threaded pipe joint and is connected to the external cooling system, which can remove the heat generated during the injection process in time, and avoid the mold from being affected by excessive temperature, thus affecting the service life and product quality. At the same time, the panel and the lower mold base are connected by internal hexagonal head screws, which makes installation and disassembly convenient. The multiple sets of mold guide rods set between the upper mold and the injection mold cavity make the mold closing process smoother and the operation simple and easy. In addition, the hard chrome plating on the outer surface of the roller improves its wear resistance and reduces wear during use. The reasonable cooperation and connection between the components also enhances the overall stability and durability of the device. Attached Figure Description

[0015] Figure 1 This is an overall drawing of the present utility model;

[0016] Figure 2 This is a schematic diagram of the injection mold cavity and positioning assembly of this utility model;

[0017] Figure 3 This is a side view of the structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the upper mold and injection mold cavity of this utility model;

[0019] Figure 5 This is a structural schematic diagram of the upper mold and positioning components of this utility model.

[0020] In the diagram: 1. Lower mold base; 2. Panel; 3. Injection mold cavity; 4. Ejector pin; 5. Ejector pin fixing plate; 6. Ejector pin guide rod; 7. Return spring; 8. Upper mold; 9. Mold guide rod; 10. Positioning assembly; 1001. Correcting frame; 1002. Ejector rod; 1003. Correcting spring; 1004. Mold core positioning block; 1005. Roller; 1006. Wedge positioning pin; 11. Positioning ring; 12. Heat dissipation assembly; 1201. Cooling water channel; 1202. Threaded pipe joint; 1203. Nut. Detailed Implementation

[0021] 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.

[0022] Please see Figure 1-5 The present invention provides a technical solution as follows:

[0023] Example 1:

[0024] A core positioning device for injection mold production includes a lower mold base 1, a panel 2 installed inside the lower mold base 1, an injection mold cavity 3 engaged with the top of the panel 2, an ejector pin 4 installed inside the lower mold base 1, an ejector pin fixing plate 5 fixedly connected to one end of the ejector pin 4, an ejector pin guide rod 6 fixedly connected to the top of the ejector pin fixing plate 5, a return spring 7 provided outside the ejector pin guide rod 6, an upper mold 8 installed above the injection mold cavity 3, a mold guide rod 9 fitted inside the upper mold 8, and a positioning component 10 installed inside the injection mold cavity 3.

[0025] The above structure uses ejector pins 4 in the lower mold base 1 to eject the molded product. One end of the ejector pin 4 is connected to the ejector pin fixing plate 5. The top of the ejector pin fixing plate 5 is fixed with the ejector pin guide rod 6. A return spring 7 is sleeved on the outside of the ejector pin. When the mold is opened, the return spring 7 assists the ejector pin fixing plate 5 to drive the ejector pin 4 to move, so as to realize the ejection of the product. The ejector pin guide rod 6 ensures the guidance and stability of the ejection movement.

[0026] Furthermore, a positioning ring 11 is embedded in the top of the upper mold 8, and a heat dissipation component 12 is installed on the outer wall of the injection mold cavity 3.

[0027] Furthermore, the positioning assembly 10 internally includes a straightening frame 1001, an ejector rod 1002, a straightening spring 1003, a mold core positioning block 1004, a roller 1005, and a wedge-shaped positioning pin 1006. The straightening frame 1001 is mounted on the outer wall of the injection mold cavity 3. The ejector rod 1002 is internally inserted through the straightening frame 1001. The straightening spring 1003 is mounted on the outer wall of the ejector rod 1002. The mold core positioning block 1004 is engaged internally within the injection mold cavity 3. The bottom of the upper mold 8 is equipped with... The roller 1005 has a wedge-shaped locating pin 1006 installed at the bottom of the upper mold 8. The inner wall of the straightening frame 1001 has a guide groove that matches the ejector rod 1002, and the side wall of the mold core locating block 1004 has another guide groove that matches the ejector rod 1002. The top of the mold core locating block 1004 has an arc-shaped groove that matches the roller 1005. The outer surface of the roller 1005 is plated with a hard chrome layer, and the interior of the mold core locating block 1004 has a wedge-shaped hole that matches the wedge-shaped locating pin 1006.

[0028] The above structure plays a key positioning role through the positioning component 10 in the injection mold cavity 3. The straightening frame 1001 is installed on the outer wall of the injection mold cavity 3, and the ejector rod 1002 passes through it. The straightening spring 1003 is sleeved on its outer wall. The mold core positioning block 1004 is engaged in the injection mold cavity 3. The roller 1005 and wedge positioning pin 1006 at the bottom of the upper mold 8 cooperate with the mold core positioning block 1004. When the mold is closed, the wedge positioning pin 1006 is inserted into the wedge hole for initial positioning, and the roller 1005 is embedded in the arc groove for auxiliary positioning. If there is a deviation, the straightening spring 1003 pushes the ejector rod 1002 and uses the guide groove to correct the position of the mold core positioning block 1004, so as to achieve high-precision positioning.

[0029] Furthermore, the heat dissipation component 12 includes a cooling water channel 1201, a threaded pipe joint 1202, and a nut 1203 arranged around the outer wall of the injection mold cavity 3. The inlet and outlet of the cooling water channel 1201 are both equipped with threaded pipe joints 1202, which are located on both sides of the injection mold cavity 3 respectively, and are connected to the external cooling system through the pipe joints. The outer wall of the threaded pipe joint 1202 is threaded with a nut 1203.

[0030] The above structure uses a heat dissipation component 12 on the outer wall of the injection mold cavity 3, which includes a cooling water channel 1201, a threaded pipe joint 1202, and a nut 1203. The cooling water channel 1201 increases the contact area with the injection mold cavity 3, thereby improving heat dissipation efficiency. The threaded pipe joints 1202 at the inlet and outlet connect to the external cooling system, and the nut 1203 tightens the pipe joint to prevent leakage of the cooling medium. By circulating the cooling medium, the heat of the mold is quickly removed, the temperature of the mold cavity is controlled, and product quality and production continuity are ensured.

[0031] Furthermore, multiple sets of mold guide rods 9 are provided between the upper mold 8 and the injection mold cavity 3, and the panel 2 and the lower mold base 1 are connected by hexagonal head screws.

[0032] The above structure uses an upper mold 8 above the injection mold cavity 3 to fit mold guide rods 9 inside. Multiple sets of mold guide rods 9 are provided between the upper mold 8 and the injection mold cavity 3 to provide precise guidance during mold closing, ensuring accurate alignment between the upper mold 8 and the injection mold cavity 3 and improving the positioning accuracy of the mold core.

[0033] Working principle: When in use, firstly, the panel 2 is fixedly installed on the lower mold base 1 with hexagon socket head cap screws. Then, the injection mold cavity 3 is snapped onto the top of the panel 2. Next, the mold core is placed on the mold core positioning block 1004 inside the injection mold cavity 3, and the mold core is positioned by the positioning component 10.

[0034] Secondly, when the positioning component 10 is working, the push rod 1002 inside the straightening frame 1001 pushes against the mold core positioning block 1004 under the action of the straightening spring 1003. Since the inner wall of the straightening frame 1001 and the side wall of the mold core positioning block 1004 are provided with guide grooves that are compatible with the push rod 1002, the push rod 1002 can push the mold core positioning block 1004 along the guide groove to perform preliminary correction of the position of the mold core positioning block 1004. When the upper mold 8 moves downward, the roller 1005 at the bottom of the upper mold 8 will contact the arc-shaped groove at the top of the mold core positioning block 1004. The hard chrome plating on the outer surface of the roller 1005 can reduce wear and improve service life. As the upper mold 8 continues to descend, the wedge-shaped positioning pin 1006 will be inserted into the wedge-shaped hole inside the mold core positioning block 1004 to further realize the precise positioning of the mold core.

[0035] During the injection molding process, the mold guide rod 9 ensures accurate mold closing between the upper mold 8 and the injection mold cavity 3. The positioning ring 11 positions the nozzle of the injection molding machine, ensuring that the molten plastic can be accurately injected into the injection mold cavity 3. At the same time, the heat dissipation component 12 starts to work, and the external cooling system introduces coolant into the cooling water channel 1201 through the threaded pipe joint 1202. The coolant flows in the cooling water channel 1201, which can quickly remove the heat generated by the injection mold cavity 3 during the injection molding process, thereby improving injection molding efficiency and product quality.

[0036] Finally, after injection molding is completed, the ejector pin 4 fixing plate moves upward under the action of external power, driving the ejector pin 4 to push the injection molded product upward. The ejector pin guide rod 6 can ensure the stability of the movement of the ejector pin fixing plate 5, and the return spring 7 plays a role in buffering and resetting when the ejector pin fixing plate is reset.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A mold core positioning device for injection mold production, comprising a lower mold base (1), characterized in that: The lower mold base (1) is equipped with a panel (2), and the top of the panel (2) is engaged with an injection mold cavity (3). The lower mold base (1) is equipped with an ejector pin (4), one end of the ejector pin (4) is fixedly connected to an ejector pin fixing plate (5), the top of the ejector pin fixing plate (5) is fixedly connected to an ejector pin guide rod (6), and a return spring (7) is provided on the outside of the ejector pin guide rod (6). The upper mold (8) is installed above the injection mold cavity (3), and a mold guide rod (9) is fitted inside the upper mold (8). The injection mold cavity (3) is equipped with a positioning component (10).

2. The mold core positioning device for injection mold production according to claim 1, characterized in that: A positioning ring (11) is embedded in the top of the upper mold (8), and a heat dissipation component (12) is installed on the outer wall of the injection mold cavity (3).

3. The mold core positioning device for injection mold production according to claim 1, characterized in that: The positioning assembly (10) includes a straightening frame (1001), an ejector rod (1002), a straightening spring (1003), a mold core positioning block (1004), a roller (1005), and a wedge positioning pin (1006). The straightening frame (1001) is installed on the outer wall of the injection mold cavity (3). The ejector rod (1002) is installed through the inside of the straightening frame (1001). The straightening spring (1003) is installed on the outer wall of the ejector rod (1002). The mold core positioning block (1004) is engaged with the inside of the injection mold cavity (3). The roller (1005) is installed at the bottom of the upper mold (8). The wedge positioning pin (1006) is installed at the bottom of the upper mold (8).

4. The mold core positioning device for injection mold production according to claim 3, characterized in that: The inner wall of the correction frame (1001) is provided with a guide groove that is compatible with the push rod (1002), and the side wall of the mold core positioning block (1004) is provided with another guide groove that is compatible with the push rod (1002).

5. A mold core positioning device for injection mold production according to claim 3, characterized in that: The top of the mold core positioning block (1004) is provided with an arc-shaped groove that matches the roller (1005). The outer surface of the roller (1005) is plated with a hard chrome layer. The interior of the mold core positioning block (1004) is provided with a wedge-shaped hole that matches the wedge-shaped positioning pin (1006).

6. A mold core positioning device for injection mold production according to claim 2, characterized in that: The heat dissipation assembly (12) includes a cooling water channel (1201), a threaded pipe joint (1202), and a nut (1203) arranged around the outer wall of the injection mold cavity (3). The inlet and outlet of the cooling water channel (1201) are both equipped with threaded pipe joints (1202), which are located on both sides of the injection mold cavity (3) and are connected to the external cooling system through the pipe joints. The outer wall of the threaded pipe joint (1202) is threaded with a nut (1203).

7. The mold core positioning device for injection mold production according to claim 1, characterized in that: Multiple sets of mold guide rods (9) are provided between the upper mold (8) and the injection mold cavity (3), and the panel (2) and the lower mold base (1) are connected by internal hexagonal head screws.

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