A core rod for slide core

Abstract

The utility model discloses a kind of slide core core rod for core-pulling, including core rod stem, the front end of core rod stem is equipped with shaped tip, shaped tip is integrally fixed with connecting column, one end of core rod stem is equipped with cylindrical groove for connecting column adaptive installation, and connecting column and cylindrical groove are detachably fixed connection, the rear end of core rod stem is integrally formed with core rod connector, the one end of core rod connector away from core rod stem is integrally formed with positioning boss, the outer peripheral wall of positioning boss is equipped with one-side positioning plane along radial, cooling flow passage is passed through and is equipped in the inside of core rod stem along center axis, the core rod structure can accurately form product lateral hole, the maintenance cost is reduced by the design of detachable shaped tip, overall rigidity is enhanced by stepped transition structure, positioning boss and one-side positioning plane guarantee core-pulling directionality and forming precision, cooling flow passage can be efficiently assisted heat dissipation, help to improve production efficiency and product quality.

Description

Technical Field

[0001] This utility model relates to the field of mold technology, and in particular to a core rod for sliding block core pulling. Background Technology

[0002] Mandrels for slider core pulling are key components in the mold technology field, adaptable to injection molding and die casting processes. They are mainly used to mold complex structures such as lateral holes and irregular grooves in products. Their molding accuracy, ease of maintenance, and motion stability directly affect product quality and production efficiency. However, traditional mandrels often adopt a structure design where the molding tip and the main body are molded as one piece. When the molding tip wears due to long-term friction, the entire mandrel needs to be disassembled and replaced, which not only increases mold maintenance costs but also prolongs equipment downtime. At the same time, some mandrels lack precise limit design in their connection and positioning structure, which is prone to circumferential rotation or axial displacement during the core pulling process, resulting in fluctuations in molding accuracy and affecting product consistency.

[0003] Therefore, those skilled in the art have provided a mandrel for core pulling of a slider to solve the problems mentioned in the background art. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a core rod for slider core pulling.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A core rod for slider core pulling includes a core rod body, the front end of the core rod body is provided with a forming tip, a connecting post is integrally fixed to one end of the forming tip near the core rod body, and a cylindrical groove is opened at the front end of the core rod body for the connecting post to be fitted and installed, and the connecting post and the cylindrical groove are detachably and fixedly connected.

[0007] The rear end of the mandrel body is integrally formed with a mandrel connector. The outer diameter of the mandrel connector is larger than the outer diameter of the mandrel body, and the mandrel connector and the mandrel body have a stepped transition structure.

[0008] The end of the mandrel connector away from the mandrel body is integrally formed with a positioning protrusion ring, and the outer peripheral wall of the positioning protrusion ring is provided with a single-sided positioning plane along the radial direction.

[0009] A cooling channel is formed inside the mandrel body along the central axis. One end of the cooling channel extends to the rear side near the forming tip, and the other end extends to the mandrel connector.

[0010] The mandrel connector has a pipe interface along its axis that is coaxially connected to the cooling channel. The pipe interface is used to connect to an external cooling pipe.

[0011] The diameter of the cooling channel is smaller than the diameter of the cylindrical groove, and the cooling channel is connected to the cylindrical groove.

[0012] Preferably, the outer wall of the connecting column is provided with external threads, and the inner wall of the cylindrical groove is provided with matching internal threads. The connecting column and the cylindrical groove are fixed by thread engagement.

[0013] Preferably, the radial dimension of the positioning protrusion is greater than the radial dimension of the mandrel connector, the extension direction of the positioning plane is perpendicular to the axis of the mandrel body, and the length of the positioning plane does not exceed the radial dimension of the positioning protrusion.

[0014] Preferably, the mandrel body, the forming tip, and the mandrel connector are all made of SKD61 mold steel.

[0015] Compared with the prior art, the beneficial effects of this utility model are:

[0016] The mandrel structure designed in this utility model features a detachable connection between the forming tip and the mandrel body. After wear, only the forming tip needs to be replaced, eliminating the need to scrap the entire mandrel, significantly reducing mold maintenance costs and shortening equipment downtime. The precise fit between the positioning convex ring and the single-sided positioning plane with the mold slider groove effectively prevents circumferential rotation or axial displacement of the mandrel during core pulling, ensuring product forming accuracy and consistency. The stepped transition structure between the mandrel connector and the mandrel body enhances the overall structural rigidity of the mandrel, stably withstanding axial forces during core pulling and reducing the risk of mandrel deformation. Simultaneously, a cooling channel running along the axis of the mandrel body and close to the rear of the forming tip facilitates efficient heat dissipation. Combined with the use of SKD61 mold steel in the mandrel body, forming tip, and mandrel connector, the mandrel's wear resistance, high-temperature resistance, and deformation resistance are further improved, extending its service life and operational stability, thus contributing to ensuring production efficiency and product quality. Attached Figure Description

[0017] To illustrate the technical solutions in the embodiments of the present invention or the prior art more specifically and intuitively, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below.

[0018] Figure 1 This is a schematic diagram of the mandrel structure for core pulling of the slider proposed in this utility model;

[0019] Figure 2 This is a schematic diagram of the cross-sectional structure of the mandrel proposed in this utility model;

[0020] Figure 3 The present utility model proposes Figure 2 Enlarged structural diagram at point A in the middle.

[0021] In the figure: 1. Mandrel body; 2. Molding tip; 21. Connecting post; 3. Mandrel connector; 31. Positioning protrusion; 32. Positioning plane; 4. Cylindrical groove; 5. Cooling channel. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] Reference Figure 1-3 A core rod for a slider core pulling includes a core rod body 1, a forming tip 2 at the front end of the core rod body 1, a connecting post 21 integrally fixed to one end of the forming tip 2 near the core rod body 1, and a cylindrical groove 4 for the connecting post 21 to be fitted and installed at the front end of the core rod body 1, and the connecting post 21 and the cylindrical groove 4 are detachably fixedly connected.

[0024] The rear end of the mandrel rod 1 is integrally formed with a mandrel connector 3. The outer diameter of the mandrel connector 3 is larger than the outer diameter of the mandrel rod 1, and the mandrel connector 3 and the mandrel rod 1 have a stepped transition structure.

[0025] The end of the mandrel connector 3 away from the mandrel body 1 is integrally formed with a positioning protrusion 31, and the outer peripheral wall of the positioning protrusion 31 is provided with a single-sided positioning plane 32 along the radial direction.

[0026] A cooling channel 5 is provided inside the mandrel body 1 along the central axis. One end of the cooling channel 5 extends to the rear side near the forming tip 2, and the other end extends to the mandrel connector 3.

[0027] Using the above technical solutions, the forming tip 2 has a conical structure, which can accurately adapt to the forming requirements of the product's lateral holes. The conical design also reduces demolding resistance and prevents damage to the product's forming surface. The detachable fixed connection between the connecting column 21 and the cylindrical groove 4 ensures the stability of the connection between the forming tip 2 and the mandrel body 1, and facilitates individual disassembly and replacement of the forming tip 2 after wear, eliminating the need to scrap the entire mandrel and significantly reducing mold maintenance costs. The mandrel connector 3 has an outer diameter larger than the mandrel body 1 and adopts a stepped transition structure, enhancing the overall structural rigidity of the mandrel and enabling it to stably withstand the axial force during the core-pulling movement. To prevent mandrel deformation, the positioning protrusion 31, in conjunction with the single-sided positioning plane 32, can precisely engage with the slot of the mold slider, restricting the circumferential rotation of the mandrel, ensuring the directional transmission of the core-pulling motion, and improving molding accuracy. The cooling channel 5 is opened through the central axis of the mandrel body 1, with one end extending to the rear side near the molding tip 2, directly targeting the core heat-generating area of ​​the product molding, so that the cooling medium can quickly reach the heat source and efficiently remove the heat generated during the molding process. At the same time, the cooling channel 5 extends to the mandrel connector 3, providing a channel for connecting to the external cooling system, ensuring smooth cooling circulation, and effectively shortening the product cooling cycle.

[0028] The mandrel connector 3 has a pipe interface along its axis that is coaxially connected to the cooling channel 5. The pipe interface is used to connect to external cooling pipes.

[0029] The diameter of the cooling channel 5 is smaller than the diameter of the cylindrical groove 4, and the cooling channel 5 is connected to the cylindrical groove 4.

[0030] Using the above technical solution, the pipe interface on the mandrel connector 3 is coaxially connected with the cooling channel 5, which can accurately connect to the external cooling pipe, reduce the flow resistance of the cooling medium at the interface, and ensure smooth flow of the medium. The diameter of the cooling channel 5 is smaller than the diameter of the rod mounting groove 4. The stepped positioning surface formed by the two facilitates the positioning and installation of the connecting column 21.

[0031] The outer wall of the connecting column 21 is provided with external threads, and the inner wall of the cylindrical groove 4 is provided with matching internal threads. The connecting column 21 and the cylindrical groove 4 are fixed by thread engagement.

[0032] By adopting the above technical solution, the external thread on the outer wall of the connecting column 21 is screwed into the internal thread on the inner wall of the cylindrical groove 4 for fixation. Compared with other detachable connection methods, the assembly and disassembly operations are more convenient, further improving the maintenance and replacement efficiency of the forming tip 2. The sealing performance of the threaded fit is better, which can effectively prevent the cooling medium in the cooling channel 5 from leaking from the connection gap, avoiding the decrease in cooling efficiency caused by the loss of cooling medium. At the same time, it prevents the forming material from seeping into the gap and affecting the normal operation of the mandrel. This not only ensures the circulation stability of the cooling system, but also extends the service life of the mandrel.

[0033] The radial dimension of the positioning protrusion 31 is greater than the radial dimension of the mandrel connector 3, the extension direction of the positioning plane 32 is perpendicular to the axis of the mandrel body 1, and the length of the positioning plane 32 does not exceed the radial dimension of the positioning protrusion 31.

[0034] By adopting the above technical solution, the radial dimension of the positioning protrusion 31 is larger than that of the mandrel connector 3, which can form a precise limit with the mounting hole of the mold slider, improve the overall coaxiality of the mandrel installation, and avoid the mandrel offset during the core pulling movement; the extension direction of the positioning plane 32 is perpendicular to the axis of the mandrel body 1, and the length does not exceed the radial dimension of the positioning protrusion 31, which not only ensures a tight fit with the mold slider slot and realizes stable directional transmission of the core pulling movement, but also avoids the positioning plane 32 being too long and interfering with other parts of the mold, ensuring smooth core pulling action, reducing local frictional heat generated by movement jamming, and indirectly helping to maintain the stable operation of the cooling system.

[0035] The mandrel body 1, the forming tip 2, and the mandrel connector 3 are all made of SKD61 mold steel.

[0036] Using the above technical solution, the mandrel body 1, the forming tip 2, and the mandrel connector 3 are all made of SKD61 mold steel. This material has excellent wear resistance, high temperature resistance, and deformation resistance, and can withstand the high temperature environment and repeated friction in the molding process such as injection molding and die casting. This prevents the mandrel from deforming due to high temperature, which would cause changes in the cross-section of the cooling channel 5 and ensure the stability of the cooling medium flow path. At the same time, the wear-resistant material reduces the wear rate of the forming tip 2, maintaining its molding accuracy while preventing heat accumulation due to gaps caused by tip wear. Combined with the cooling effect of the cooling channel 5, this further optimizes the overall cooling effect and the service life of the mandrel.

[0037] Working principle:

[0038] During assembly, the mandrel is fitted and fixed to the mold slider groove via the positioning protrusion 31 and the single-sided positioning plane 32 of the mandrel connector 3. The pipe interface of the mandrel connector 3 is connected to the external cooling system. After the mold is closed, the forming tip 2 at the front end of the mandrel rod 1 extends into the cavity and cooperates with the cavity to form the side hole of the product. At the same time, the cooling medium flows into the cooling channel 5 through the pipe interface and flows through the rear side of the forming tip 2 for efficient heat dissipation. After the product is formed, the mold slider drives the mandrel to be pulled out laterally, and the forming tip 2 is separated from the product hole to complete the demolding. If the forming tip 2 is worn, the fixing structure of the connecting column 21 and the cylindrical groove 4 can be removed and replaced separately.

[0039] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A core rod for pulling a slider, comprising a core rod body (1), characterized in that, The front end of the mandrel rod (1) is provided with a forming tip (2), and a connecting post (21) is integrally fixed to one end of the forming tip (2) near the mandrel rod (1). The front end of the mandrel rod (1) is provided with a cylindrical groove (4) for the connecting post (21) to be fitted and installed, and the connecting post (21) and the cylindrical groove (4) are detachably fixedly connected. The rear end of the mandrel rod (1) is integrally formed with a mandrel connector (3), the outer diameter of the mandrel connector (3) is larger than the outer diameter of the mandrel rod (1), and the mandrel connector (3) and the mandrel rod (1) have a stepped transition structure. The end of the mandrel connector (3) away from the mandrel body (1) is integrally formed with a positioning protrusion (31), and the outer peripheral wall of the positioning protrusion (31) is provided with a single-sided positioning plane (32) in the radial direction; The mandrel body (1) has a cooling channel (5) running through its interior along the central axis. One end of the cooling channel (5) extends to the rear side near the forming tip (2), and the other end extends through to the mandrel connector (3).

2. A mandrel for core pulling of a slider according to claim 1, characterized in that, The mandrel connector (3) has a pipe interface along the axis that is coaxially connected to the cooling channel (5), and the pipe interface is used to connect to the external cooling pipe. The diameter of the cooling channel (5) is smaller than the diameter of the cylindrical groove (4), and the cooling channel (5) is connected to the cylindrical groove (4).

3. A core rod for sliding block core pulling according to claim 1, characterized in that, The outer wall of the connecting column (21) is provided with an external thread, and the inner wall of the cylindrical groove (4) is provided with a matching internal thread. The connecting column (21) and the cylindrical groove (4) are fixed by thread engagement.

4. A core rod for sliding block core pulling according to claim 1, characterized in that, The radial dimension of the positioning protrusion (31) is greater than the radial dimension of the mandrel connector (3), the extension direction of the positioning plane (32) is perpendicular to the axis of the mandrel rod (1), and the length of the positioning plane (32) does not exceed the radial dimension of the positioning protrusion (31).

5. A core rod for sliding block core pulling according to claim 1, characterized in that, The mandrel body (1), the forming tip (2), and the mandrel connector (3) are all made of SKD61 mold steel.

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