Inverted drilling box body mold
By improving the slider forming rod structure and ejector pin design of the inverted drill box mold, the problem of cold material residue was solved, efficient production and low-cost manufacturing were achieved, and product quality was ensured.
Patent Information
- Application Number
- CN202422871085.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-11-25
- Publication Date
- 2025-09-23
- Estimated Expiration
- 2034-11-25
AI Technical Summary
During the injection molding process, cold material is easily retained at the contact points of the ejector pins on both sides of the drill box, resulting in low production efficiency and high cost, and the need to add a subsequent punching process.
A reverse drill box mold is designed, which adopts a forming rod structure connected by a first slider and a second slider. The forming rod abuts and cools in the mold cavity to reduce cold material residue. Through the design of multiple ejectors and arc-shaped gates, the product is ensured to be smoothly demolded and the subsequent processing steps are simplified.
Reduce cold material residue, improve processing efficiency, reduce production costs, ensure product quality and production efficiency, simplify the demoulding process, and improve equipment utilization.
Smart Images
Figure CN223369989U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of injection molds, and particularly relates to an inverted drill box mold. Background Art
[0002] Retrograde interlocking intramedullary nailing is one of the effective methods for treating certain specific fractures. During fracture surgery, a reverse drill is used to insert a guide wire into the medullary cavity through a small incision on the distal side of the fracture site (usually the end away from the center of the body). The medullary cavity is then expanded along the guide wire, and the intramedullary nail is inserted into the medullary cavity from the distal side to the proximal side for fixation. In order to enable the reverse drill to more accurately control the angle of the drill blade, the reverse drill box is improved, an internal square hole is added, and a double-core-pulling mold is designed for one-time molding of the product. However, during the injection molding process, it was found that cold material was easily retained at the contact points of the ejector pins on both sides, and the cold material remained on the hole wall, requiring the addition of a post-punching process, resulting in low production efficiency and high production costs.
[0003] Therefore, the above problems need to be solved urgently. Utility Model Content
[0004] Purpose of the utility model: In order to overcome the above shortcomings, the utility model provides a reverse drilling box mold, so that the molded product has a through hole with square holes at both ends and a round hole in the middle, reducing the residual cold material, and eliminating the need for subsequent processes to cut off the residual cold material, thereby improving processing efficiency and reducing production costs.
[0005] Technical solution: In order to achieve the above-mentioned purpose, it includes a movable template, a fixed template, a first slider and a second slider. The first slider and the second slider are arranged between the movable template and the fixed template, the first slider is slidably connected to the movable template along the first core-pulling direction, and the second slider is slidably connected to the movable template along the second core-pulling direction. The first core-pulling direction and the second core-pulling direction are arranged in a straight line and opposite to each other. The first slider is connected to the first forming rod, and the second slider is connected to the second forming rod, and the first forming rod and the second forming rod are arranged coaxially. The first forming rod is configured as a square column at one end away from the first slider, and the first forming rod is configured as a cylindrical portion close to the square column of the first forming rod. The second forming rod is configured as a cylindrical portion away from the second slider, and the second forming rod is configured as a square column portion close to the cylindrical portion of the second slider. When the mold is closed, the first forming rod and the second forming rod abut against each other, and the movable template and the fixed template abut against each other to form a mold cavity. The first core-pulling direction is the direction in which the first slider is away from the second slider, and the second core-pulling direction is the direction in which the second slider is away from the first slider. The improved inverted drill box is provided with a through hole, and there are square holes at both ends of the circular hole. The diameter of the circular hole is smaller than the square hole. The traditional single-side core pulling method requires additional subsequent processes to process the square hole on the other side of the circular hole. The utility model combines a movable template and a fixed template to form a mold cavity, and the first slider and the second slider slide toward the mold cavity respectively, and the first forming rod and the second forming rod abut in the mold cavity, and the molten material is cooled and formed in the mold cavity. During the cooling process, the molten material wraps the first forming rod and the second forming rod. Since the abutting ends of the second forming rod and the first forming rod are cylindrical, the middle part of the second forming rod is square, and the abutting ends of the first forming rod and the second forming rod are square, when the second forming rod and the first forming rod abut to form a core with square columns connected to the two ends of the cylinder respectively, when the molten material cools in the mold cavity around the first forming rod and the second forming rod, the movable template and the fixed template are separated, and the first slider moves along the first core-pulling direction to drive the first forming rod to move out of the mold cavity, and the second slider moves along the second core-pulling direction to drive the second forming rod to move out of the mold cavity, completing demolding, and the molded product has a through hole with square holes at both ends and a round hole in the middle. In the original injection molded product, the abutment part of the first molding rod and the second molding rod was designed to be in the middle of the circular hole, and the residual cold material was large, which needed to be punched out later. Now the abutment part of the first molding rod and the second molding rod is designed to be at the step where the square hole and the circular hole are connected, which reduces the residual cold material. The residual cold material does not affect the subsequent assembly and does not need to be punched out later, which reduces the subsequent processing steps, improves the processing efficiency, and reduces the production cost.
[0006] Furthermore, in the aforementioned inverted drill box mold, the movable platen is provided with a core, which is positioned between a first slider and a second slider. The core is provided with a first through-hole along a first core-pulling direction and a second core-pulling direction. A first forming rod is inserted into the first through-hole. One end of the first forming rod, which is in the shape of a square column, extends to the side of the core away from the first slider. After the first forming rod passes through the core, it abuts against the second forming rod. The molten material cools and forms around the first forming rod, the second forming rod, and the core, forming a three-way hole. After the molten material cools, the core moves with the movable platen, forming a three-core-pulling structure, meeting production requirements and improving production efficiency.
[0007] Furthermore, in the aforementioned inverted drill box mold, the core is cylindrical, with a second through-hole defined along its axis. An ejector pin is inserted into the second through-hole. After the melt cools, the movable and fixed mold plates are separated, and the ejector pin is ejected through the second through-hole to complete demolding, reducing manual intervention and improving processing efficiency.
[0008] Furthermore, in the aforementioned inverted drill box mold, multiple second through-holes are provided, arranged in an array along the core axis, with ejector pins and second through-holes disposed correspondingly. Providing multiple ejector pins and second through-holes increases the number of contact points between the ejector pins and the product, ensuring more uniform force distribution on the product, ensuring smooth product ejection from the mold cavity, reducing the possibility of product deformation and damage during demolding, distributing ejection force, reducing ejection marks, and improving product appearance quality.
[0009] Furthermore, in the above-mentioned inverted drill box mold, the first slider is provided with a first oblique groove, a first guide post is provided in the first oblique groove, and the first guide post and the first oblique groove are correspondingly arranged. During mold separation, the first guide post pushes the first slider along the first core-pulling direction. The second slider is provided with a second oblique groove, a second guide post is provided in the second oblique groove, and the second guide post and the second oblique groove are correspondingly arranged. During mold separation, the second guide post pushes the second slider along the second core-pulling direction. The first guide post and the second guide post are respectively connected to the fixed mold plate. The second guide post is longer than the first guide post. The longer second guide post can increase the core-pulling distance, ensure that the second guide post can be smoothly separated from the product, and demolding can be smoothly achieved.
[0010] Furthermore, in the aforementioned inverted drill box mold, two or more cores, first forming rods, and second forming rods are each provided, with the cores corresponding to the first and second forming rods. Two or more cores, first forming rods, and second forming rods can be used to mold and produce two or more products simultaneously, improving production efficiency and equipment utilization. The first slider connects two or more first forming rods, and the second slider connects two or more second forming rods. This simplifies the mold structure and reduces the difficulty of mold manufacturing while ensuring synchronous core pulling.
[0011] Furthermore, in the aforementioned inverted drill box mold, the movable platen is provided with a movable mold core, the fixed platen is provided with a fixed mold core, the movable mold core is provided with a lower groove on the side close to the fixed mold core, and the fixed mold core is provided with an upper groove on the side close to the movable mold core. Two or more lower grooves and upper grooves are provided, respectively, and the lower grooves and upper grooves form a mold cavity. Two or more ejectors are provided in the lower grooves. During the demolding process, the ejectors in the lower grooves synchronously eject the cold sprue from the sprue, ensuring smooth demolding. Two or more corresponding lower grooves and upper grooves form multiple mold cavities, enabling the production of multiple products in one molding, improving production efficiency and reducing production costs.
[0012] Furthermore, in the aforementioned inverted drill box mold, an upper flow channel is provided between the two lower grooves, and a lower flow channel is provided between the two upper grooves. The upper and lower flow channels are arranged in a corresponding manner and are both curved. The upper and lower flow channels form a sprue that connects the multiple mold cavities. The curved sprue design causes the molten material to gradually change direction in the sprue, reducing flow resistance and pressure loss. This allows the fluid to smoothly and evenly fill the multiple mold cavities, ensuring tea quality for farmers.
[0013] Furthermore, in the aforementioned inverted drill box mold, the movable platen is equipped with cooling water channels, extending to the upper and lower sides of the mold cavity. The cooling water channels help accelerate the cooling and solidification of the plastic, shorten the injection molding cycle, improve production efficiency, ensure that product shrinkage during cooling is minimized, and enhance product quality stability.
[0014] Furthermore, in the above-mentioned inverted drill box mold, a fixed mold base plate is provided on the side of the fixed mold plate away from the movable mold plate, an ejector plate is provided on the side of the movable mold plate away from the fixed mold plate, and a movable mold base plate is provided on the side of the ejector plate away from the movable mold plate.
[0015] It can be seen from the above technical solution that the utility model has the following beneficial effects: the utility model uses an inverted drill box mold so that the product after molding has a through hole with square holes at both ends and a round hole in the middle, which can reduce the residual cold material. The residual cold material does not affect the subsequent assembly and does not need to be punched and removed subsequently, which reduces the subsequent processing steps, improves the processing efficiency, and reduces the production cost. The setting of multiple mold cavities enables the production of multiple products in one molding, improves production efficiency, and reduces production costs. Multiple ejectors can increase the contact points between the ejector and the product, so that the product is more evenly stressed, ensuring that the product is smoothly ejected from the mold cavity, reducing the possibility of deformation and damage of the product during the demoulding process, dispersing the ejection force, reducing ejection marks, and improving the appearance quality of the product. The arc-shaped sprue design allows the molten material to gradually change direction in the sprue, reducing flow resistance, reducing pressure loss, and enabling the fluid to smoothly and evenly fill multiple mold cavities to ensure product quality. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a front view of the inverted drill box mold of the utility model;
[0017] Figure 2 for Figure 1 The BB sectional view is shown;
[0018] Figure 3 is a schematic structural diagram of the first forming rod;
[0019] Figure 4 is a schematic structural diagram of the second forming rod;
[0020] Figure 5 for Figure 1 The AA sectional view is shown;
[0021] Figure 6 for Figure 3 Partial enlarged view;
[0022] Figure 7 This is a schematic diagram of the interior of the inverted drill box mold of the utility model.
[0023] In the figure: 1. movable platen, 11. movable mold core, 111. lower groove, 112. upper flow channel, 12. first slider, 121. first forming rod, 122. first inclined groove, 123. first guide column, 13. second slider, 131. second forming rod, 132. second inclined groove, 133. second guide column, 14. core, 141. first through hole, 142. second through hole, 15. ejector pin, 16. cooling water channel, 212. lower flow channel, 2. fixed platen, 21. fixed mold core, 211. upper groove, 3. fixed mold base plate, 4. ejector plate, 5. movable mold base plate. DETAILED DESCRIPTION
[0024] Example 1
[0025] like Figure 1-4The mold for an inverted drill box shown includes a movable platen 1, a fixed platen 2, a first slider 12, and a second slider 13. The first slider 12 and the second slider 13 are arranged between the movable platen 1 and the fixed platen 2. The first slider 12 is slidably connected to the movable platen 1 along a first core-pulling direction, and the second slider 13 is slidably connected to the movable platen 1 along a second core-pulling direction. The first core-pulling direction and the second core-pulling direction are arranged in opposite directions in a straight line. The first slider 12 is connected to a first forming rod 121, and the second slider 13 is connected to a second forming rod 131. The first forming rod 121 and the second forming rod 131 are arranged coaxially. The first forming rod 121 is configured as a square column at the end away from the first slider 12, and the square column portion of the first forming rod 121 near the first forming rod 121 is configured as a cylinder. The second forming rod 131 is configured as a cylinder at the end away from the second slider 13, and the cylindrical portion of the second forming rod 131 near the second forming rod 131 is configured as a square column. When the mold is closed, the first forming rod 121 and the second forming rod 131 abut against each other, and the movable plate 1 and the fixed plate 2 abut against each other to form a mold cavity. The first core-pulling direction is the direction in which the first slider 12 moves away from the second slider 13, and the second core-pulling direction is the direction in which the second slider 13 moves away from the first slider 12. A fixed mold base plate 3 is provided on the side of the fixed plate 2 away from the movable plate 1, an ejector plate 4 is provided on the side of the movable plate 1 away from the fixed plate 2, and a movable mold base plate 5 is provided on the side of the ejector plate 4 away from the movable plate 1. The movable plate 1 is provided with a core 14, which is provided between the first slider 12 and the second slider 13. The core 14 is provided with a first through hole 141 (see FIG. 1 ) along the first core-pulling direction and the second core-pulling direction. Figure 6 ), the first molding rod 121 passes through the first through hole 141, and one end of the first molding rod 121 is in the shape of a square column and extends to the side of the core 14 away from the first slider 12. When the mold is closed, the first molding rod 121 passes through the core 14 and abuts against the second molding rod 131. The movable mold plate 1 is provided with a movable mold core 11, and the fixed mold plate 2 is provided with a fixed mold core 21. The movable mold core 11 is provided with a lower groove 111 on the side close to the fixed mold core 21, and the fixed mold core 21 is provided with an upper groove 211 on the side close to the movable mold core 11. There are 2 or more lower grooves 111 and upper grooves 211 respectively, and the lower grooves 111 and the upper grooves 211 form a mold cavity. There are 2 or more ejectors in the lower groove 11. During the demolding process, the ejectors in the lower groove 11 will simultaneously eject the cold material from the sprue to ensure smooth demolding. The movable mold plate 1 is provided with a cooling water channel 16, and the cooling water channel 16 extends to the upper and lower sides of the mold cavity respectively.
[0026] During use, the fixed mold base plate 3 and the movable mold base plate 5 are respectively connected to the injection molding machine, the injection molding machine is closed, the movable mold plate 1 and the fixed mold plate 2 are abutted, the lower groove 111 and the upper groove 211 form a mold cavity, the first slider 12 and the second slider 13 slide into the mold cavity respectively, the first molding rod 121 and the second molding rod 131 move in the mold cavity, the first molding rod 121 is in the shape of a square column and one end extends to the side of the core 14 away from the first slider 12 and abuts against the second molding rod 131, the molten material is injected into the mold cavity from the gate, the molten material is cooled and formed in the mold cavity, the cooling water channel 16 is injected with cooling water for cooling during the cooling process, the molten material wraps the first molding rod 121 and the second molding rod 131 to cool and form, The abutting ends of 131 and the first forming rod 121 are cylindrical, the middle part of the second forming rod 131 is square, and the abutting ends of the first forming rod 121 and the second forming rod 131 are square. When the second forming rod 131 and the first forming rod 121 abut against each other, a core with square columns connected at both ends of the cylinder is formed. After the molten material cools in the mold cavity around the first forming rod 121 and the second forming rod 131, the movable mold plate 1 and the fixed mold plate 2 are separated, and the first slider 12 moves along the first core-pulling direction to drive the first forming rod 121 out of the mold cavity. The second slider 13 moves along the second core-pulling direction to drive the second forming rod 131 out of the mold cavity. The ejector plate 4 drives the ejector to move to eject the product, completing demolding.
[0027] like Figure 5 In the illustrated inverted drill box mold, the first slider 12 is provided with a first beveled groove 122, within which a first guide post 123 is disposed, and the first guide post 123 and the first beveled groove 122 are disposed in correspondence. During mold separation, the first guide post 123 pushes the first slider 12 in the first core-pulling direction. The second slider 13 is provided with a second beveled groove 132, within which a second guide post 133 is disposed, and the second guide post 133 and the second beveled groove 132 are disposed in correspondence. During mold separation, the second guide post 133 pushes the second slider 13 in the second core-pulling direction. The first guide post 123 and the second guide post 133 are respectively connected to the fixed mold plate 2. The second guide post 133 is longer than the first guide post 123. Two or more cores 14, first molding rods 121, and second molding rods 131 are each provided, and the core 14 and the first molding rods 121 and second molding rods 131 are disposed in correspondence. There are two or more lower grooves 111 and upper grooves 211 respectively, an upper flow channel 112 is provided between the two lower grooves 111, and a lower flow channel 212 is provided between the two upper grooves 211. The upper flow channel 112 and the lower flow channel 212 are arranged correspondingly, and both the upper flow channel 112 and the lower flow channel 212 are arc-shaped.
[0028] like Figure 6-7In the illustrated inverted drill box mold, the core 14 is cylindrical, with a second through-hole 142 defined along its axis. An ejector pin 15 is inserted into the second through-hole 142. Multiple second through-holes 142 are provided, arranged in an array along the axis of the core 14, with the ejector pin 15 positioned correspondingly to the second through-holes 142.
[0029] The above embodiments are illustrative and intended to illustrate the technical concepts and features of the present invention so that those skilled in the art can understand the present invention and implement it accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the spirit of the present invention shall be included within the scope of protection of the present invention.
Claims
1. A reverse drilling box mold, characterized by: The invention comprises a movable plate (1), a fixed plate (2), a first slider (12) and a second slider (13); the first slider (12) and the second slider (13) are arranged between the movable plate (1) and the fixed plate (2); the first slider (12) is slidably connected to the movable plate (1) along a first core-pulling direction, and the second slider (13) is slidably connected to the movable plate (1) along a second core-pulling direction; the first core-pulling direction and the second core-pulling direction are arranged in opposite directions in a straight line; the first slider (12) is connected to a first forming rod (121), the second slider (13) is connected to a second forming rod (131), and the first forming The molding rod (121) and the second molding rod (131) are coaxially arranged; the first molding rod (121) is configured as a square column at one end away from the first slider (12), and the first molding rod (121) is configured as a cylindrical portion close to the square column of the first molding rod (121); the second molding rod (131) is configured as a cylindrical portion away from the second slider (13), and the cylindrical portion of the second molding rod (131) close to the second molding rod (131) is configured as a square column; when the mold is closed, the first molding rod (121) and the second molding rod (131) abut against each other, and the movable mold plate (1) and the fixed mold plate (2) abut against each other to form a mold cavity.
2. The inverted drill box mold according to claim 1, characterized in that: The movable template (1) is provided with a core (14), and the core (14) is provided between the first slider (12) and the second slider (13). The core (14) is provided with a first through hole (141) along the first core-pulling direction and the second core-pulling direction. The first forming rod (121) penetrates the first through hole (141). The first forming rod (121) is in a square column shape and one end extends to the side of the core (14) away from the first slider (12).
3. The inverted drill box mold according to claim 2, characterized in that: The core (14) is cylindrical, and a second through hole (142) is provided along the axis of the core (14), and a thimble (15) is inserted into the second through hole (142).
4. The inverted drill box mold according to claim 3, characterized in that: There are two or more second through holes (142), and the second through holes (142) are arranged in an array along the axis of the core (14), and the ejector pins (15) and the second through holes (142) are arranged accordingly.
5. The inverted drill box mold according to claim 1, characterized in that: The first slider (12) is provided with a first inclined groove (122), a first guide column (123) is provided in the first inclined groove (122), and the first guide column (123) and the first inclined groove (122) are correspondingly arranged; when the mold is separated, the first guide column (123) pushes the first slider (12) out along the first core-pulling direction; the second slider (13) is provided with a second inclined groove (132), a second guide column (133) is provided in the second inclined groove (132), and the second guide column (133) and the second inclined groove (132) are correspondingly arranged; when the mold is separated, the second guide column (133) pushes the second slider (13) out along the second core-pulling direction; the first guide column (123) and the second guide column (133) are respectively connected to the fixed mold plate (2), and the second guide column (133) is longer than the first guide column (123).
6. The inverted drill box mold according to claim 2, characterized in that: The core (14), the first forming rod (121), and the second forming rod (131) are respectively provided with two or more, and the core (14), the first forming rod (121), and the second forming rod (131) are arranged correspondingly.
7. The inverted drill box mold according to claim 6, characterized in that: The movable mold plate (1) is provided with a movable mold core (11), the fixed mold plate (2) is provided with a fixed mold core (21), a lower groove (111) is provided on a side of the movable mold core (11) close to the fixed mold core (21), and an upper groove (211) is provided on a side of the fixed mold core (21) close to the movable mold core (11); two or more lower grooves (111) and upper grooves (211) are provided respectively, and the lower grooves (111) and upper grooves (211) form a mold cavity.
8. The inverted drill box mold according to claim 7, characterized in that: An upper flow channel (112) is provided between the two lower grooves (111), and a lower flow channel (212) is provided between the two upper grooves (211). The upper flow channel (112) and the lower flow channel (212) are provided correspondingly, and both the upper flow channel (112) and the lower flow channel (212) are arc-shaped.
9. The inverted drill box mold according to claim 1, characterized in that: The movable die plate (1) and the fixed die plate (2) are provided with cooling water channels (16), and the cooling water channels (16) extend to the upper and lower sides of the die cavity respectively.
10. The inverted drill box mold according to claim 1, characterized in that: A fixed die base plate (3) is provided on the side of the fixed die plate (2) away from the movable die plate (1), an ejector plate (4) is provided on the side of the movable die plate (1) away from the fixed die plate (2), and a movable die base plate (5) is provided on the side of the ejector plate (4) away from the movable die plate (1).