Connecting structure of mold core and mold core seat in mold
By introducing guide holes, clearance holes, locking holes, and the meshing design of operating rods in the connection structure of the core and core seat in the mold, the problem of decreased precision caused by loose bolts after long-term use is solved, achieving stable connection and accurate molding effect, and preventing unauthorized disassembly.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- TAIZHOU VOCATIONAL & TECHN COLLEGE
- Filing Date
- 2026-04-02
- Publication Date
- 2026-05-12
AI Technical Summary
In existing molds, the connection between the core and the core holder is prone to bolt loosening after prolonged use, leading to a decrease in molding accuracy.
By setting guide holes and clearance holes on the core and locking holes and mounting holes on the core seat, the core and core seat are stably positioned by the meshing of the rack and operating rod. Combined with the fastening of bolts, the core is double-connected and limited in the direction of the bolt axis.
This effectively avoids the impact of loose bolts on the product molding accuracy, ensures the fitting accuracy of the core and core seat during long-term use, and prevents unauthorized disassembly through the design of the solder plate and cover plate, facilitating the determination of responsibility.
Smart Images
Figure CN122007191A_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of mold technology and relates to a connection structure between a mold core and a core seat. Background Technology
[0002] During the use of molds, bolts are usually used to fix the core seat and the core together. When problems arise with the quality of the mold after use, it is necessary to determine whether the failure is caused by improper use or by a failure during production. This can lead to disputes between the manufacturer and the mold maker when problems occur.
[0003] In existing molds, the connection between the core and the core holder is described in, for example, Chinese patent application [Authorization Announcement No.: CN216441397U], which discloses a combined drawing mold for grooved parts, including a mold body and a detachable cantilever. The mold body includes a mold sleeve and a core located inside the mold sleeve. The core is tightly fitted to the mold sleeve. The cantilever includes a core and a core holder. The core holder is fixed to the upper end face of the mold sleeve. The upper part of the core is fixedly connected to the core holder. The lower part of the core extends into the drawing die hole of the mold body, and the thickness of the core section located in the drawing die hole is equal to the groove width of the finished grooved part.
[0004] In the above structure, the core and the core seat are fixed together by bolts. However, during long-term use, the bolts may loosen due to fatigue, affecting the fitting accuracy of the core and the core seat, and thus affecting the molding quality of the plastic part. Summary of the Invention
[0005] The purpose of this invention is to address the aforementioned problems in existing technologies by proposing a connection structure for the core and core holder in a mold. The technical problem to be solved by this invention is: how to solve the problem of decreased fitting accuracy between the core and core holder in existing molds after prolonged use.
[0006] The objective of this invention can be achieved through the following technical solutions: A connection structure for a core and a core seat in a mold, the mold including a core seat and a core, the core seat having a positioning groove, the core being embedded in the positioning groove and pressed against the bottom surface of the positioning groove by a bolt, characterized in that the connection structure includes a rack and a control lever, the core having a guide hole perpendicular to the bolt and elongated in shape, the rack slidingly through the guide hole along the axial direction and being radially fixed by the core, the core having an elongated clearance hole, the guide hole and the clearance hole being perpendicular to each other and communicating, the core seat having a locking hole concentric with the guide hole and a mounting hole concentric with the clearance hole, the end of the control lever having meshing teeth, the control lever passing through the mounting hole and the clearance hole and meshing the meshing teeth with the rack, the control lever being able to drive the rack to move axially so that the end of the rack slides into the locking hole so that the rack is radially fixed by the core seat.
[0007] By providing guide holes and clearance holes on the core, with the guide holes and clearance holes arranged perpendicularly to each other and connected, and by providing locking holes and mounting holes on the core seat, the rack is first placed in the guide holes and radially fixed by the core. The core is then placed in the positioning groove of the core seat and tightened onto the bottom surface of the positioning groove with bolts. The operating rod is then inserted through the mounting holes and clearance holes, allowing the meshing teeth of the operating rod to engage with the rack. Rotating the operating rod then slides one end of the rack into the locking hole, radially fixing the rack to the core seat. Through this fixing to the core and radial fixation by the core seat, the rack is effectively secured. The rack stably positions the core and core seat, further pressing the core firmly against the bottom surface of the positioning groove. Through the limiting relationship between the rack and the core and core seat, and the fastening of the bolts, with the bolt connection direction perpendicular to the rack's axis, the rack can radially position the core and core seat, further firmly pressing the core against the bottom surface of the positioning groove of the core seat. This achieves dual connection and limiting of the core seat and core in the bolt axis direction, preventing the bolts from loosening during long-term use and affecting the molding accuracy of the product, thus ensuring the fitting accuracy between the core seat and core during long-term use.
[0008] In the connection structure between the core and the core seat in the above-mentioned mold, the operating rod is in the shape of a long column and is located in the middle of the core.
[0009] The position of the operating lever ensures that the meshing point between the operating lever and the rack is located in the middle of the core, hidden inside the core. This avoids interference from external dust and improves the fitting accuracy and connection stability between the core and the core seat.
[0010] In the above-mentioned mold core and core seat connection structure, a limiting strip is formed on the side wall of the rack along the length direction of the rack, and a limiting slide is provided on one side of the guide hole for the limiting strip to slide, and the outer side wall of the limiting strip fits against the side wall of the limiting slide.
[0011] The setting of the limiting strip serves two purposes. First, it guides the movement of the rack, ensuring that the rack can only slide along the guide hole. Second, when the rack slides, the outer wall of the limiting strip fits against the side wall of the limiting groove, thus limiting the rack circumferentially and preventing circumferential rotation during the rack's movement. This, in turn, improves the fitting accuracy between the core and the core seat.
[0012] In the above-mentioned mold core and core seat connection structure, the rack is cylindrical, the transverse cross section of the limiting strip is square, and the limiting strip and the meshing teeth on the rack are arranged symmetrically along the radial direction of the rack.
[0013] The shape of the rack and the limiting strip, as well as the position of the meshing teeth on the rack and the limiting strip, ensure that the meshing and guiding of the rack do not affect each other. Therefore, the rack can stably mesh with the operating rod while being stably guided and limited by the limiting strip, which improves the accuracy of the meshing between the rack and the operating rod. This allows the rack to stably fix the core radially, which is then radially fixed by the core seat, further improving the fitting accuracy between the core seat and the core.
[0014] In the above-mentioned mold core and core seat connection structure, one end of the operating rod has meshing gear teeth located in the clearance hole, and the other end has a cylindrical operating part that protrudes circumferentially. The mounting hole is a countersunk hole, and the operating part is set in the countersunk end of the countersunk hole. An operating blind hole is opened at the outer end of the operating part.
[0015] By setting the meshing gear teeth in the clearance hole and providing an operating part that protrudes axially at the other end, the operating part is placed at the countersunk end of the countersunk hole for placement. An operating blind hole, usually a hexagonal screw hole or a cross hole, is provided at the outer end of the operating part to facilitate the insertion of tools and drive the operating part to rotate, thereby realizing the rotation of the operating rod and facilitating installation.
[0016] In the above-mentioned mold core and core seat connection structure, the operating part is welded with a solder plate that closes the operating blind hole, the outer wall of the core seat is provided with a closed hole that communicates with the mounting hole, and the core seat is fixedly connected with a cover plate that covers the solder plate in the closed hole.
[0017] By sealing the blind holes with a solder plate and then fixing the cover plate to the core seat to shield the solder plate, stable positioning of the operating rod is achieved. When the core needs to be disassembled and repaired, the cover plate must be removed first, and then the solder plate can be forcibly destroyed. This solves the problem of whether the mold was disassembled and repaired by the manufacturer without authorization, making it easier to determine responsibility for the mold later. The cover plate prevents external impurities or dust from falling into the solder plate, avoiding damage to the outer wall of the solder plate and improving the sealing effect.
[0018] In the above-mentioned mold core and core seat connection structure, a clearance gap is formed between the cover plate and the solder plate.
[0019] The clearance setting ensures that the solder plate placement does not affect the cover plate installation, improving installation convenience.
[0020] In the connection structure between the core and the core seat in the above-mentioned mold, both the guide hole and the locking hole are cylindrical grooves, and the diameter of the guide hole is equal to the diameter of the locking hole.
[0021] This design facilitates the placement of the rack, reduces the difficulty of rack assembly, and improves assembly convenience.
[0022] In the above-mentioned mold core and core seat connection structure, one end of the limiting slide passes through the core, and the port of that end is connected to the slot of the guide hole.
[0023] The structure of the limiting slide allows the rack to slide into the core from one end of the limiting slide and the slot of the guide hole, improving the ease of rack installation. It also ensures that the connection between the operating rod rack of the core and the core seat is located inside both, avoiding contamination from external dust and other contaminants, and guaranteeing the meshing accuracy of the operating rod rack.
[0024] In the connection structure of the core and core seat in the above-mentioned mold, there is an installation gap between the bottom of the clearance hole and the operating rod.
[0025] This structure ensures that when the operating lever rotates and drives the rack to move, the driving force only drives the rack to rotate, without friction with the bottom of the clearance hole, thus guaranteeing stable meshing between the two.
[0026] Compared with existing technologies, the connection structure between the core and the core holder in this mold has the following advantages: 1. By limiting the connection between the rack, core, and core seat, and by fixing it with bolts, the connection direction of the bolts is perpendicular to the axis of the rack. This allows the rack to radially position the core and core seat, further and stably pressing the core onto the bottom surface of the positioning groove of the core seat. This achieves dual connection and limiting of the core seat and core in the bolt axis direction, preventing the bolts from loosening during long-term use and affecting the molding accuracy of the product. It also ensures the fitting accuracy between the core seat and core during long-term use.
[0027] 2. By sealing the blind holes with a solder plate and then fixing the cover plate to the core seat to shield the solder plate, stable positioning of the operating rod is achieved. When the core needs to be disassembled and repaired, the cover plate must be removed first, and then the solder plate can be forcibly destroyed. This solves the problem of whether the mold was disassembled and repaired by the manufacturer without authorization, making it easier to determine the responsibility of the mold later. The cover plate prevents external impurities or dust from falling into the solder plate, avoiding damage to the outer wall of the solder plate and improving the sealing effect. Attached Figure Description
[0028] Figure 1 This is a schematic diagram of the structure of the present invention.
[0029] Figure 2 This is a side view of the present invention.
[0030] Figure 3 yes Figure 2 Sectional view of AA.
[0031] Figure 4 yes Figure 2 A cross-sectional view of BB.
[0032] Figure 5 yes Figure 4 A magnified view of a portion of point A in the middle.
[0033] Figure 6 This is a partial exploded view of the present invention.
[0034] Figure 7 This is a partial structural schematic diagram of the present invention.
[0035] In the diagram, 1 is the core; 11 is the guide hole; 11a is the limiting slide; 12 is the clearance hole; 2 is the core seat; 21 is the locking hole; 22 is the mounting hole; 23 is the sealing hole; 24 is the positioning groove; 3 is the bolt; 4 is the rack; 41 is the limiting strip; 42 is the meshing tooth; 5 is the operating lever; 51 is the meshing gear tooth; 52 is the operating part; 52a is the operating blind hole; 6 is the solder plate; 7 is the cover plate; 8 is the clearance clearance; and 9 is the installation clearance. Detailed Implementation
[0036] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings to further illustrate the technical solutions of the present invention. However, the present invention is not limited to these embodiments.
[0037] like Figure 1-3 As shown, the connection structure of the core and core seat in this mold is as follows: the mold includes a core seat 2 and a core 1. The core seat 2 has a positioning groove 24. The core 1 is embedded in the positioning groove 24 and pressed against the bottom surface of the positioning groove 24 by the action of the bolt 3.
[0038] Specifically, such as Figure 1-5 As shown, this connection structure includes a rack 4 and a lever 5. The core 1 has a guide hole 11 that is perpendicular to the bolt 3 and is elongated. The rack 4 slides axially through the guide hole 11 and is radially fixed by the core 1. The core 1 has an elongated clearance hole 12. The guide hole 11 and the clearance hole 12 are perpendicular to each other and communicate with each other. The core seat 2 has a locking hole 21 concentric with the guide hole 11 and a mounting hole 22 concentric with the clearance hole 12. The end of the lever 5 has meshing teeth 51. The lever 5 passes through the mounting hole 22 and the clearance hole 12 and meshes with the rack 4. The lever 5 can drive the rack 4 to move axially so that the end of the rack 4 slides into the locking hole 21 and the rack 4 is radially fixed by the core seat 2.
[0039] A guide hole 11 and a clearance hole 12 are provided on the core 1, and the guide hole 11 and the clearance hole 12 are arranged perpendicularly to each other and connected. A locking hole 21 and a mounting hole 22 are provided on the core seat 2. During installation, the rack 4 is first placed in the guide hole 11, and the rack 4 is radially fixed by the core 1. The core 1 is then placed in the positioning groove 24 of the core seat 2 and tightened onto the bottom surface of the positioning groove 24 by the threaded bolt 3. The operating rod 5 is then inserted into the mounting hole 22 and the clearance hole 21, so that the meshing gear teeth 51 of the operating rod 5 mesh with the rack 4. The operating rod 5 is then rotated, causing one end of the rack 4 to slide into the locking hole 21, so that the rack 4 is radially fixed by the core seat 2. The rack 4 is fixed to the core 1. The core 1 and the core seat 2 are radially fixed by the rack 4, which achieves stable positioning of the core 1 and the core seat 2. The rack 4 further presses the core 1 firmly against the bottom surface of the positioning groove 24. Through the connection of the rack 4 and the fastening of the bolt 3, the connection direction of the bolt 3 is perpendicular to the axis of the rack 4. The rack 4 can rely on itself to radially position the core 1 and the core seat 2, and can further press the core 1 firmly against the bottom surface of the positioning groove 24 of the core seat 2. This achieves double connection and limitation of the core seat 2 and the core 1 in the axial direction of the bolt 3, avoiding the impact on the molding accuracy of the product after the bolt 3 loosens during long-term use, and ensuring the fitting accuracy between the core seat 2 and the core 1 during long-term use.
[0040] like Figure 3-5 As shown, the operating lever 5 is a long column and is located in the middle of the core 1. A limiting strip 41 is formed on the side wall of the rack 4 along the length of the rack 4. A limiting slide 11a is provided on one side of the guide hole 11 for the limiting strip 41 to slide. The outer side wall of the limiting strip 41 fits against the side wall of the limiting slide 11a. One end of the limiting slide 11a penetrates the core 1 and the port of that end is connected to the slot of the guide hole 11. The rack 4 is cylindrical and the transverse cross section of the limiting strip 41 is square. The meshing teeth 42 on the limiting strip 41 and the rack 4 are symmetrically arranged radially along the rack 4. The guide hole 11 and the locking hole 21 are both cylindrical slots. The diameter of the guide hole 11 is equal to the diameter of the locking hole 21. The length of the limiting strip 41 is less than the length of the rack 4, and the limiting strip 41 is located at one end of the rack 4 located in the core 1.
[0041] like Figure 4-7As shown, one end of the operating lever 5 has meshing gear teeth 51 located in the clearance hole 12, and the other end has an operating part 52 that protrudes circumferentially and is cylindrical. The mounting hole 22 is a countersunk hole. The operating part 52 is set in the countersunk end of the countersunk hole. An operating blind hole 52a is opened at the outer end of the operating part 52. A solder plate 6 that closes the operating blind hole 52a is welded on the operating part 52. A closed hole 23 communicating with the mounting hole 22 is opened on the outer wall of the core seat 2. A cover plate 7 that covers the solder plate 6 is fixedly connected to the core seat 2 in the closed hole 23. A clearance gap 8 is formed between the cover plate 7 and the solder plate 6. There is an installation gap 9 between the bottom of the clearance hole 12 and the operating lever 5.
[0042] The solder board 6 is made of tin foil, and is specifically soldered onto the operating part 52 by a tin foil coating and heat sealing process.
[0043] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.
Claims
1. A connection structure between a core and a core holder in a mold, the mold comprising a core holder (2) and a core (1), wherein the core holder (2) has a positioning groove (24), and the core (1) is embedded in the positioning groove (24) and pressed against the bottom surface of the positioning groove (24) by a bolt (3), characterized in that, This connection structure includes a rack (4) and a lever (5). The core (1) has a guide hole (11) that is perpendicular to the bolt (3) and is elongated. The rack (4) slides axially through the guide hole (11) and is radially fixed by the core (1). The core (1) has an elongated clearance hole (12). The guide hole (11) and the clearance hole (12) are perpendicular to each other and communicate with each other. The core seat (2) has a clearance hole (11) that is perpendicular to the guide hole (12). 1) A concentric locking hole (21) and a mounting hole (22) concentric with the clearance hole (12). The end of the operating lever (5) has meshing gear teeth (51). The operating lever (5) passes through the mounting hole (22) and the clearance hole (12) and makes the meshing gear teeth (51) mesh with the rack (4). The operating lever (5) can drive the rack (4) to move axially so that the end of the rack (4) slides into the locking hole (21) so that the rack (4) is radially fixed by the core seat (2).
2. The connection structure between the core and the core holder in the mold according to claim 1, characterized in that, The control lever (5) is in the shape of a long column and is located in the middle of the core (1).
3. The connection structure between the core and the core holder in the mold according to claim 1 or 2, characterized in that, A limiting strip (41) is formed on the side wall of the rack (4) along the length direction of the rack (4). A limiting slide (11a) is provided on one side of the guide hole (11) for the limiting strip (41) to slide. The outer side wall of the limiting strip (41) is in contact with the side wall of the limiting slide (11a).
4. The connection structure between the core and the core holder in the mold according to claim 3, characterized in that, The rack (4) is cylindrical, the transverse cross section of the limiting strip (41) is square, and the limiting strip (41) and the meshing teeth (42) on the rack (4) are arranged symmetrically along the radial direction of the rack (4).
5. The connection structure between the core and the core holder in the mold according to claim 1 or 2, characterized in that, One end of the control lever (5) has meshing gear teeth (51) located in the clearance hole (12), and the other end has a cylindrical operating part (52) that protrudes circumferentially. The mounting hole (22) is a countersunk hole, and the operating part (52) is located in the countersunk end of the countersunk hole. The outer end of the operating part (52) is provided with an operating blind hole (52a).
6. The connection structure between the core and the core holder in the mold according to claim 5, characterized in that, The operating part (52) is welded with a solder plate (6) that closes the operating blind hole (52a). The outer wall of the core seat (2) is provided with a hole (23) that closes the mounting hole (22). The core seat (2) is fixed with a cover plate (7) that covers the solder plate (6) in the hole (23).
7. The connection structure between the core and the core holder in the mold according to claim 6, characterized in that, A clearance gap (8) is formed between the cover plate (7) and the solder plate (6).
8. The connection structure between the core and the core holder in the mold according to claim 1 or 2, characterized in that, Both the guide hole (11) and the locking hole (21) are cylindrical grooves, and the diameter of the guide hole (11) is equal to the diameter of the locking hole (21).
9. The connection structure between the core and the core holder in the mold according to claim 3, characterized in that, One end of the limiting slide (11a) passes through the core (1), and the port of that end is connected to the slot of the guide hole (11).
10. The connection structure between the core and the core holder in the mold according to claim 3, characterized in that, There is an installation gap (9) between the bottom of the clearance hole (12) and the control lever (5).