A device for cutting off the sprue of an injection molded automobile part

Abstract

The utility model discloses a kind of material head cutting device of automobile injection molding, including base and bearing seat, the base is equipped with the slide bar for being penetrated bearing seat and with bearing seat constitutes sliding connection, the bottom of bearing seat one end is equipped with cutting mechanism, the surface of base is fixed with guide column, it is connected between the guide column by cutting plate, cutting plate is below cutting mechanism, the top shaft head of guide column is connected with fastening shaft head by screw thread, the utility model adopts manual pressing bearing seat cooperation spring reset driving mode, overall structure is simple and compact, operator only needs to manually press to complete cutting, while metal support column is stably supported to cutting plate, further guarantee the structural stability of cutting process, not only let equipment is small and exquisite, can be flexibly moved to production station nearby, also reduce failure probability and maintenance difficulty, without professional personnel can complete routine maintenance.

Description

Technical Field

[0001] This utility model mainly relates to the field of automotive injection molding processing technology, specifically a material cutting device for automotive injection molding parts. Background Technology

[0002] Automotive injection molded parts refer to various components used in automobile manufacturing, produced from plastic as raw material through injection molding (injecting molten plastic raw material into a mold cavity, cooling and solidifying to form a specific shape). Automotive plastic clips are a subcategory of automotive injection molded parts, referring to small plastic accessories produced through injection molding for connecting or fixing automotive components. Their structure typically includes a "clamping part" (for embedding or fastening other parts) and a "base" (for connecting to the fixed component). The material is mostly nylon or PP with good toughness, and they are commonly found in interior panel fixing, wiring harness organization, sealing strip installation, and headliner assembly.

[0003] As typical automotive injection molded parts, snap fasteners are small in size and come in various shapes. To improve production efficiency, they are often mass-produced using a "one-out-of-many" mold—that is, multiple snap fasteners are injection molded in one operation, and these snap fasteners are connected as a group through a plastic "sprue" (the residual part of the channel through which molten plastic flows during injection). The sprue is only an auxiliary structure in the production process and is not the product itself. Therefore, a cutting device is needed to separate the snap fasteners from the sprue, thus requiring a sprue cutting device. However, most current cutting equipment relies on hydraulic or pneumatic drive systems, which are complex in structure and have many parts. They are prone to failure due to problems such as oil circuit blockage and air circuit leakage, resulting in high maintenance costs. At the same time, the equipment requires professional personnel to operate and debug, which requires high skills. However, small injection molded parts such as snap fasteners are small in size and simple in structure. The cutting operation only needs to accurately cut the connecting bridge of the material head, which can be completed without complex power drive. The current equipment relies on hydraulic or pneumatic drive, resulting in complex structure, high maintenance costs, and high operating threshold, which is not compatible with the characteristics of small snap fasteners of "small size, simple structure, and mass production". Therefore, there is an urgent need for a manual material head cutting device with a simplified structure, easy operation, low maintenance cost, and flexible adaptation to snap fasteners of multiple sizes. Utility Model Content

[0004] This utility model addresses the problem of overly simplistic existing technical solutions by providing a cutting device for automotive injection molded parts. This device solves the technical problems mentioned in the background section, where existing cutting equipment relies on hydraulic or pneumatic drives, resulting in complex structures, high maintenance costs, and high operating thresholds, which are incompatible with the characteristics of automotive plastic clips: "small size, simple structure, and mass production."

[0005] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: A cutting device for the sprue of an automotive injection molded part includes a base and a support. The base is provided with a slide rod for passing through the support and forming a sliding connection with the support. A cutting mechanism is provided at the bottom of one end of the support. Guide columns are fixed on the surface of the base. The guide columns are connected by a cutting plate. The cutting plate is located below the cutting mechanism. A fastening shaft head is threaded to the top of the guide column.

[0006] The cutting mechanism includes a top plate frame and a positioning post integrated on the top of the cutter. The top plate frame has a positioning slot for inserting the positioning post inside. A limit stop is attached to the lower part of the positioning slot. One end of the outer wall of the top plate frame has a mounting slot for movably connecting a pressing button. The pressing button and the limit stop are connected by a connecting rod.

[0007] Furthermore, a spring is wound around one end of the base surface by a sliding rod that passes through the bearing seat, and the springs are distributed vertically and spaced apart by the bearing seat. A support column is fixed to the other end of the base.

[0008] Furthermore, the support column is made of cylindrical metal, and its top is tightly fitted to the bottom of the cutting board.

[0009] Furthermore, the surface of the cutting plate is provided with a through slot for fitting with the sharp end of the upper cutting tool. The slot and the center of the cutting edge of the upper cutting tool are arranged along the same center line in the vertical direction. Along both ends of the slot, through grooves are symmetrically distributed to separate the workpiece from the material head.

[0010] Furthermore, the guide posts are distributed along the four corners of the cutting plate, and each of the four corners of the cutting plate has through holes for the guide posts to pass through. The guide posts are provided with annular protrusions on their exterior, which are used to fit tightly against the bottom of the cutting plate and to support and limit the cutting plate.

[0011] Furthermore, the positioning posts are symmetrically distributed along the central axis of the tool surface where they are located, and the positioning posts have a stepped shape that is narrower at the top and wider at the bottom. An integral shaft is provided at the center of the shaft below the wide surface, and the limiting block is distributed between the positioning post and the positioning slot.

[0012] Furthermore, the top plate frame is fixed to one side of the bottom of the support seat corresponding to the cutting plate, and a spring is fixed inside the top plate frame to one side corresponding to the limiting block. One end of the spring is fixed to the limiting block at the corresponding end, and one end of the limiting block is provided with a semi-circular groove. When the positioning post is inserted into the positioning slot, the surface of the positioning post is attached to and abuts against the bottom of the largest area of ​​the limiting block, and the semi-circular groove at the bottom of the limiting block covers the outside of the positioning post shaft.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This device adopts a manual pressing and spring-reset drive method, eliminating the need for complex power systems such as hydraulics and cylinders. The overall structure is simple and compact. Operators only need to manually press to complete the cutting. The spring's buffering effect can also reduce the rigid impact between the blade and the cutting board, reducing component wear. At the same time, the metal support column provides stable support for the cutting board, further ensuring the structural stability of the cutting process. This not only makes the equipment compact and easily movable to the vicinity of the production station, but also reduces the probability of failure and maintenance difficulty. Routine maintenance can be completed without professional personnel.

[0014] 2. The cutting blade and cutting plate of this device are modularly customized as needed, and matching components can be customized according to the specifications of the automotive plastic clips to be cut (such as the size and shape of the material head connecting bridge, the size of the clip body, etc.). The cutting blade quickly inserts into the positioning slot of the top plate frame through the symmetrically distributed stepped positioning posts on the top, and achieves stable fixation and convenient disassembly with the spring return structure of the limit stop. The cutting plate is quickly replaced and positioned by precise cooperation between the four corner through holes and the guide column, with the help of the annular protrusion and the fastening shaft head. When cutting clips of the corresponding specifications, this cutting device can be adapted to different specifications of clips by simply changing the corresponding module, which improves the versatility and switching efficiency of the equipment.

[0015] The present invention will be explained in detail below with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the main structure of this utility model; Figure 2 This is a schematic diagram of the cutting board and fastening shaft head structure of this utility model; Figure 3 This is a schematic diagram of the support column distribution structure of this utility model; Figure 4 This is a schematic diagram of the cutting mechanism of this utility model.

[0017] Numbering on the map: 1. Base; 2. Bearing seat; 3. Cutting mechanism; 301. Top plate frame; 302. Positioning column; 303. Positioning slot; 304. Limiting block; 305. Connecting rod; 306. Pressing button; 4. Guide column; 5. Cutting plate; 6. Fastening shaft head; 7. Support column. Detailed Implementation

[0018] To facilitate understanding of this utility model, a more comprehensive description of the utility model will be given below with reference to the accompanying drawings, which show several embodiments of the utility model. However, the utility model can be implemented in different forms and is not limited to the embodiments described in the text. On the contrary, these embodiments are provided to make the disclosure of the utility model more thorough and comprehensive.

[0019] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used in this document are for illustrative purposes only.

[0020] Please refer to the appendix carefully. Figure 1-4 A cutting device for cutting the sprue of an automotive injection molded part includes a base 1 and a support 2. The base 1 is provided with a slide rod for passing through the support 2 and forming a sliding connection with the support 2. A cutting mechanism 3 is provided at the bottom of one end of the support 2. A guide column 4 is fixed on the surface of the base 1. The guide columns 4 are connected by a cutting plate 5. The cutting plate 5 is located below the cutting mechanism 3. A fastening shaft head 6 is threadedly connected to the top shaft head of the guide column 4.

[0021] The cutting mechanism 3 includes a top plate frame 301 and a positioning post 302 integrated on the top of the cutter. The top plate frame 301 has a positioning slot 303 for inserting the positioning post 302 inside. A limit stop 304 is attached to the lower part of the positioning slot 303. One end of the outer wall of the top plate frame 301 has a mounting slot for movably connecting a pressing button 306. The pressing button 306 and the limit stop 304 are connected by a connecting rod 305.

[0022] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, a spring is wrapped around the outside of a sliding rod that passes through the bearing seat 2 at one end of the surface of the base 1, and the springs are distributed vertically and spaced apart by the bearing seat 2. A support column 7 is fixed at the other end of the base 1.

[0023] With the above structure, considering the miniaturization, lightweighting and mass production characteristics of injection molded parts such as automotive plastic buckles, there is no need to use complex hydraulic or cylinder-driven automated cutting equipment. The cutting action can be completed simply by the operator manually pressing down the support seat 2. When the support seat 2 is pressed down, the spring on one side is compressed and stores elastic potential energy. After the cutting is completed, the spring force can automatically drive the support seat 2 to return to its original position. This not only eliminates the step of manually lifting and resetting, improving the convenience of operation, but also avoids rigid impact during cutting through the buffering effect of the spring, reducing the wear on the cutter and cutting plate 5, thus balancing ease of operation and equipment durability.

[0024] In this embodiment, as Figure 2 and Figure 3 As shown, the support column 7 is made of cylindrical metal, and its top is tightly attached to the bottom of the cutting board 5.

[0025] Through the above structure, the material of the support column 7 itself can provide stable bottom support for the cutting plate 5. Especially when the blade presses down to cut the material head, it can effectively disperse the cutting force and prevent the cutting plate 5 from bending or deforming due to excessive local force.

[0026] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the surface of the cutting plate 5 has a through slot for fitting with the sharp end of the upper cutting tool. The slot and the center of the cutting edge of the upper cutting tool are arranged along the same center line in the vertical direction. Along both ends of the slot, there are through grooves for separating the workpiece from the material head.

[0027] Through the above structure, the design of the groove on the surface of the cutting plate 5 being collinear with the center of the blade in the vertical direction ensures that the blade is accurately embedded in the groove when the blade is pressed down, achieving a tight fit with the material head connecting bridge. This not only ensures the accuracy of the cutting position, but also enhances the stability of the cutting process by limiting the blade through the groove. The through-slots symmetrically distributed at both ends of the groove provide a dedicated drop channel for the separated buckle body. Combined with the placement and positioning of the buckle, the separated workpiece can be quickly removed from the cutting area.

[0028] In this embodiment, as Figure 1 , Figure 2 and Figure 3 As shown, the guide posts 4 are distributed along the four corners of the cutting plate 5, and each of the four corners of the cutting plate 5 has through holes for the guide posts 4 to pass through. The guide posts 4 have annular protrusions on their exterior, which are used to fit tightly against the bottom of the cutting plate 5 and to support and limit the cutting plate 5.

[0029] Through the above structure, the guide columns 4 distributed at the four corners provide a precise positioning reference for the cutting plate 5, ensuring that the cutting plate 5 is stable after installation. The outer ring protrusion restricts the vertical displacement of the cutting plate 5 by tightly fitting with the bottom of the cutting plate 5. Together with the fastening shaft head 6 at the top, it can form a two-way fixation from top to bottom. Furthermore, the cutting plate 5 can be modularly customized according to the specifications of the automotive plastic buckles to be cut (including the size and shape of the buckle body, the position, length and distribution of the material head connecting bridge, etc.). It can work in conjunction with the similarly modularly customized cutter to meet the cutting needs of buckles under different specifications.

[0030] In this embodiment, as Figure 4 As shown, the positioning pins 302 are symmetrically distributed along the central axis of the tool surface on which they are located, and the positioning pins 302 have a stepped shape that is narrower at the top and wider at the bottom. A shaft with an integral structure is provided at the center of the shaft below the wide surface, and the limiting block 304 is distributed between the positioning pins 302 and the positioning slot 303.

[0031] Through the above structure, the symmetrical distribution of the positioning posts 302 ensures balanced force on the cutter, avoiding blade skewing caused by center of gravity shift during cutting. Its structural shape facilitates quick insertion of the positioning posts 302 into the positioning slots 303, simplifying installation. Furthermore, the positioning posts 302 can be integrated into the top of the cutter. The cutter can be modularly customized according to parameters such as the size, thickness, shape (e.g., straight, irregular) of the connecting bridge of the automotive plastic clip to be cut, as well as the specifications of the clip body, to adapt to the cutting requirements of different workpieces. By simply replacing the cutter module integrated with positioning posts 302 of different specifications and the corresponding cutting plate 5, the adaptability of this device to automotive plastic clips of different sizes and shapes can be expanded. In this embodiment, as Figure 4 As shown, the top plate frame 301 is fixed to the bottom of the bearing seat 2 on one side corresponding to the cutting plate 5, and a spring is fixed inside the top plate frame 301 on one side corresponding to the limiting block 304. One end of the spring is fixed to the limiting block 304 at the corresponding end, and a semi-circular groove is opened at one end of the limiting block 304. When the positioning post 302 is inserted into the positioning slot 303, the surface of the positioning post 302 is attached to and abuts against the bottom of the largest area of ​​the limiting block 304, and the semi-circular groove at the bottom of the limiting block 304 covers the outside of the shaft of the positioning post 302.

[0032] Through the above structure, the limit stop 304 connected by the spring can automatically reset with the help of the elastic force. With the semi-circular groove at one end of the limit stop 304 covering the shaft of the positioning post 302, and the abutting relationship between the surface of the positioning post 302 and the bottom of the largest area of ​​the limit stop 304, the tool can be limited and fixed, ensuring the structural stability of the tool after installation and preventing deviation or shaking during cutting. Furthermore, the connecting rod 305 driven by the pressing button 306 enables the limit stop 304 to move quickly, making the disassembly and replacement of the tool convenient and efficient. It takes into account both connection strength and operational flexibility, and adapts to the rapid switching needs of modular tools.

[0033] The specific operating procedure of this utility model is as follows: It should be noted that both the cutting blade and the cutting plate 5 in the cutting mechanism 3 can be set as modular components. The two need to be matched with each other to meet the cutting requirements of different specifications of buckles. The modular blade is customized based on the specific parameters of the buckle to be cut. For example, the width and angle of the blade need to be adapted to the size and thickness of the material head connecting bridge, and the shape of the cutting edge needs to correspond to the shape of the material head connecting bridge (such as a straight cutting edge for a straight material head and a special curved cutting edge for an irregularly shaped material head). The design of the cutting plate 5 also follows the adaptation principle. The groove on its surface that fits into the blade needs to be precisely matched with the blade parameters of the selected blade to ensure that the blade can be fully embedded in the groove when the blade is pressed down to achieve a tight fit, thus avoiding material residue or blade damage during cutting. At the same time, the through slots symmetrically distributed at both ends of the cutting plate 5 are positioned and have diameters determined according to the size and shape of the buckle body to correspond to the falling path after the buckle and the material are separated, ensuring that the separated buckle can fall smoothly through the through slot and achieve automated collection (only one set of modular blades and the matching cutting plate 5 are shown in the attached figure).

[0034] When using this automotive injection molded part cutting device, the metal base 1 should first be placed stably on the processing table near the production part to ensure the overall stability of the equipment.

[0035] Place the multiple automotive plastic clips connected to the material heads on the surface of the cutting plate 5, aligning the material head connecting bridges (i.e., the parts connecting the clips) with the grooves on the surface of the cutting plate 5 that fit against the blade edge. Ensure that the material head connecting bridges are directly below the blade edge. At the same time, the main body of the clips should be positioned above the symmetrically distributed through slots at both ends of the cutting plate 5, providing a drop channel for the clips after separation. The operator holds the protruding handle on one side of the support seat 2 and presses it down. At this time, the support seat 2 slides downward along the sliding rod on the base 1. The spring wrapped around the outside of the slide bar is compressed; as the support seat 2 moves down, the cutting mechanism 3 at its bottom descends synchronously, and the blade gradually contacts the material head connecting bridge at the groove of the cutting plate 5. At this time, the bottom of the cutting plate 5 is tightly supported by the support column 7 to prevent the cutting plate 5 from deforming under force when the blade is pressed down, thus ensuring the support performance during the cutting process. After continuous pressure is applied, because the blade of the cutting mechanism is modularly matched according to the specifications of the material head connecting bridge, when the blade cuts the material head connecting bridge, the buckle will disengage from the connecting bridge where the material head is located.

[0036] The separated material ends remain near the groove of the cutting plate 5, while the main body of the buckle falls through the through slots at both ends of the cutting plate 5, completing a single cutting operation. After the pressure on the support seat 2 is released, the support seat 2 returns to its initial position under the elastic force of the spring outside the slide rod, so as to perform the next cutting.

[0037] If the cutting plate 5 needs to be replaced, the fastening head 6 on the top of the guide column 4 can be unscrewed. After all the fastening heads 6 are removed, the old cutting plate 5 is removed from the guide column 4. Then, the through holes at the four corners of the new cutting plate 5 are aligned with the guide column 4, so that its bottom fits against the annular protrusion on the outside of the guide column 4. Finally, the fastening head 6 is screwed on the top of the guide column 4 to fix the cutting plate 5.

[0038] For the installation or replacement of the cutting tool of the cutting mechanism 3, push the pressing button 306 on the outer wall of the top plate frame 301. The connecting rod 305 drives the limiting block 304 to move inward and compress the spring on one side. The semi-circular groove at the bottom of the limiting block 304 then disengages from the covering state of the positioning post 302 shaft. At the same time, the original abutting relationship between the surface of the limiting block 304 and the positioning post 302 is released, allowing the positioning post 302 to disengage from the positioning slot 303.

[0039] Subsequently, the cutting tool will be disassembled from the top plate holder 301, thus achieving the disassembly of the cutting tool.

[0040] During installation, push the pressing button 306 on the outer wall of the top plate frame 301 again to compress the spring of the limit block 304 and keep it in the innermost position, ensuring that the positioning slot 303 is in an insertable state. Insert the positioning pin 302, which has a stepped shape with a narrow top and a wide bottom, into the positioning slot 303 until the shaft of the positioning pin 302 is fully inserted into the groove of the top plate frame 301. Release the pressing button 306, and the limit block 304 will reset under the action of the spring force. The semi-circular groove at its bottom will cover the shaft of the positioning pin 302 again. At the same time, the bottom of the positioning pin 302 will be in close contact with the surface of the limit block 304 to limit it, thereby achieving a stable installation of the new tool.

[0041] The present invention has been described above by way of example in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvement made by adopting the inventive concept and technical solution of the present invention, or the direct application of the inventive concept and technical solution of the present invention to other occasions without modification, shall be within the protection scope of the present invention.

Claims

1. A cutting device for the sprue of automotive injection molded parts, comprising a base (1) and a support (2), characterized in that: The base (1) is provided with a sliding rod for passing through the bearing seat (2) and forming a sliding connection with the bearing seat (2). A cutting mechanism (3) is provided at the bottom of one end of the bearing seat (2). A guide column (4) is fixed on the surface of the base (1). The guide columns (4) are connected by a cutting plate (5). The cutting plate (5) is located below the cutting mechanism (3). A fastening shaft head (6) is threaded to the top shaft head of the guide column (4). The cutting mechanism (3) includes a top plate frame (301) and a positioning post (302) integrated on the top of the cutter. The top plate frame (301) has a positioning slot (303) for inserting the positioning post (302) inside. A limit stop (304) is attached to the bottom of the positioning slot (303). One end of the outer wall of the top plate frame (301) has an installation slot for movably connecting a pressing button (306). The pressing button (306) and the limit stop (304) are connected by a connecting rod (305).

2. The material cutting device for automotive injection molded parts according to claim 1, characterized in that: One end of the base (1) is wrapped with a spring by a sliding rod that passes through the bearing seat (2), and the springs are distributed vertically and spaced apart by the bearing seat (2). The other end of the base (1) is fixed with a support column (7).

3. The material cutting device for automotive injection molded parts according to claim 2, characterized in that: The support column (7) is made of cylindrical metal and its top is tightly attached to the bottom of the cutting board (5).

4. The material cutting device for automotive injection molded parts according to claim 1, characterized in that: The surface of the cutting plate (5) is provided with a slot for fitting with the sharp end of the upper cutting tool. The slot and the center of the cutting edge of the upper cutting tool are arranged along the same center line in the vertical direction. Along both ends of the slot, there are through grooves for separating the workpiece from the material head.

5. The material cutting device for automotive injection molded parts according to claim 1, characterized in that: The guide posts (4) are distributed along the four corners of the cutting plate (5), and the four corners of the cutting plate (5) are provided with through holes for the guide posts (4) to pass through. The guide posts (4) are provided with annular protrusions on the outside. The annular protrusions are used to fit tightly with the bottom of the cutting plate (5) and to support and limit the cutting plate (5).

6. The material cutting device for automotive injection molded parts according to claim 1, characterized in that: The positioning pins (302) are symmetrically distributed along the central axis of the tool surface on which they are located, and the positioning pins (302) have a stepped shape that is narrow at the top and wide at the bottom. An integral shaft is provided at the center of the shaft below the wide surface. The limiting block (304) is distributed between the positioning pins (302) and the positioning slot (303).

7. The material cutting device for automotive injection molded parts according to claim 1, characterized in that: The top plate frame (301) is fixed to the bottom of the bearing seat (2) on one side corresponding to the cutting plate (5), and a spring is fixed inside the top plate frame (301) on one side corresponding to the limiting block (304). One end of the spring is fixed to the limiting block (304) at the corresponding end, and a semi-circular groove is opened at one end of the limiting block (304). When the positioning post (302) is inserted into the positioning slot (303), the surface of the positioning post (302) is attached to and abuts against the bottom of the largest area of ​​the limiting block (304), and the semi-circular groove at the bottom of the limiting block (304) covers the outside of the shaft of the positioning post (302).

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