A cutting device for resin-pur combinations

Abstract

The resin-PUR combination product cutting device disclosed by the embodiments of the present disclosure comprises a rack and a hot cutting assembly arranged on the rack, wherein the hot cutting assembly comprises an operation platform arranged on the rack, and a cutting mechanism arranged at the middle position of the operation platform; the cutting mechanism comprises an inverted L-shaped upper knife holder fixed on the rack, and a heated lower knife holder opposite to the upper knife holder; the inner side of the supporting arm of the upper knife holder is provided with a longitudinal sliding rail, the side of the heated lower knife holder is provided with a sliding block matched with the longitudinal sliding rail, a longitudinally driven air cylinder is arranged on the rack, the driving end of the air cylinder is connected with the bottom of the heated lower knife holder, a fixed knife is arranged on the upper knife holder, a movable knife is arranged on the heated lower knife holder, the blade parts of the fixed knife and the movable knife are vertically opposite, and a temperature sensing probe connected with a temperature controller is arranged in the fixed knife. The device realizes the cutting of the resin inner core and the PUR material combined mold through the hot knife structure of the upper and lower pressure, guarantees the smooth and flat cutting surface, and guarantees that the combined surface is not layered, thereby guaranteeing the product quality and reducing the cost.

Description

Technical Field

[0001] This disclosure relates to the field of product cutting technology, specifically to a cutting device for a resin-PUR composite product. Background Technology

[0002] The information disclosed in this background section is intended only to enhance understanding of the overall background of this disclosure and is not necessarily to be construed as an admission or in any way an implication that the information constitutes related technology that is already known to those skilled in the art.

[0003] In related technologies, the product with in-mold spraying process has a resin material inside and a PUR material outside. The PUR material wraps around the inner resin material product. Since the resin core of the product sprayed in the mold needs to be full and the PUR flow is stable, the material bundle connecting the products is wide and thick. However, the thickness of the outer PUR material is basically the same, which is a thin layer bond. The material bundle is difficult to remove when the mold is used.

[0004] Currently, globally, the removal of gates after injection molding of products produced using this process is mostly done via CNC machining. This method offers high gate cleanliness and ensures dimensional accuracy. However, the flying debris during CNC machining can easily cause scratches on the product. Milling resin-PUR composite products can also lead to delamination between the resin and PUR layers, as well as issues like bubbles, chipped corners, and irregular shapes, making performance testing unreliable. On the other hand, some factories have begun to use edge-sealing agents to reduce delamination during CNC machining. However, this process results in an uneven surface and poor appearance. Furthermore, CNC machining and the procurement of edge-sealing agents increase costs, add processes and manpower, and raise the defect rate. Utility Model Content

[0005] Therefore, this disclosure provides a cutting device for resin-PUR composite products to solve the problems in the related art where delamination easily occurs when cutting products with resin material inside and PUR material outside, and where the need to add edge sealing agent results in unreliable product quality or increased costs.

[0006] To achieve the goal of obtaining a gate removal method that is low-cost, involves fewer processes, and has a guaranteed yield and performance, the embodiments of this disclosure provide the following technical solutions: In a first aspect of the embodiments of this disclosure, a cutting apparatus for a resin-PUR composite product is provided, comprising: The frame contains an electrical control box and a temperature controller. The hot cutting assembly is mounted on the frame, including an operating platform mounted on the frame, and a cutting mechanism is provided at the middle position of the operating platform; The cutting mechanism includes an inverted L-shaped upper blade holder fixed on the frame, and a heated lower blade holder opposite to the upper blade holder. The heated lower blade holder is connected to a temperature controller. A longitudinal slide rail is provided on the inner side of the support arm of the upper blade holder. The side of the heated lower blade holder has a slider that cooperates with the longitudinal slide rail. A longitudinally driven cylinder is provided on the frame. The driving end of the cylinder is connected to the bottom of the heated lower blade holder. A fixed blade is provided on the upper blade holder, and a moving blade is provided on the heated lower blade holder. The blades of the fixed blade and the moving blade are perpendicular to each other. A temperature sensing probe connected to the temperature controller is provided inside the fixed blade.

[0007] Furthermore, the operating platform includes a front frame and a rear frame, the rear frame has a frame groove, the front frame part is fitted into the frame groove, and the cutting mechanism is disposed in the frame groove.

[0008] Furthermore, the cutting mechanism is fixed to the longitudinal end face of the front frame by an adjusting plate, the tool holder assembly is fixed on the adjusting plate, the upper tool holder is set on the side of the tool holder assembly, the bottom of the tool holder assembly forms a clamping structure, the cylinder is installed inside the tool structure, and the driving end of the cylinder passes upward through the tool holder assembly.

[0009] Furthermore, the mounting portion of the moving blade is provided with a transverse receiving hole, and the temperature sensing probe is disposed within the receiving hole.

[0010] Furthermore, the frame is also equipped with a waste recycling bin, the upper opening of which is opposite to the frame slot.

[0011] Furthermore, the bottom of the frame is equipped with casters.

[0012] According to the embodiments of this disclosure, the hot cutting device has the following advantages: it includes a frame and a hot cutting assembly mounted on the frame, including an operating platform mounted on the frame, with a cutting mechanism located in the middle of the operating platform; the cutting mechanism includes an inverted L-shaped upper blade holder fixed on the frame and a heated lower blade holder opposite to the upper blade holder, a longitudinal slide rail is provided on the inner side of the support arm of the upper blade holder, and a slider that cooperates with the longitudinal slide rail is provided on the side of the heated lower blade holder, a longitudinally driven cylinder is provided on the frame, the driving end of the cylinder is connected to the bottom of the heated lower blade holder, a fixed blade is provided on the upper blade holder, a moving blade is provided on the heated lower blade holder, the blades of the fixed blade and the moving blade are perpendicularly opposite each other, and a temperature sensing probe connected to a temperature controller is provided inside the fixed blade. This device employs a top-and-bottom pressurized hot blade structure. By using a hot blade on the resin core side and a fixed blade on the PUR material side to apply pressure and cut, it achieves the cutting of the mold that bonds the resin core and PUR material. This ensures a smooth and flat cutting surface without delamination of the bonding surface, guaranteeing product quality and reducing costs. A temperature sensor is installed near the blade's cutting surface to control temperature control for more precise heat transfer. This results in a smooth cut surface with more accurate dimensions and no residue after hot cutting. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments or related technologies of this disclosure, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0014] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the conditions under which this disclosure can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this disclosure can produce, should still fall within the scope of the technical content disclosed herein.

[0015] Figure 1 This is a perspective view of a cutting device for a resin-PUR composite product according to an exemplary embodiment; Figure 2 This is a front view of a cutting device for a resin-PUR composite product according to an exemplary embodiment. Figure 3 This is a perspective view of a cutting mechanism in a cutting device for a resin-PUR composite product according to an exemplary embodiment. Figure 4 This is a front view of a cutting mechanism according to an exemplary embodiment.

[0016] In the diagram: 1. Frame; 2. Electrical control box; 3. Temperature controller; 4. Front frame; 5. Rear frame; 6. Frame slot; 7. Tool holder assembly; 8. Adjustment plate; 9. Upper tool holder; 10. Heated lower tool holder; 11. Longitudinal slide rail; 12. Slider; 13. Cylinder; 14. Fixed tool; 15. Moving tool; 16. Accommodation hole; 17. Waste recycling bin; 18. Casters. Detailed Implementation

[0017] The following specific embodiments illustrate the implementation of this disclosure. Those skilled in the art can easily understand other advantages and effects of this disclosure from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. Based on the embodiments in this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0018] The terms “upper,” “lower,” “left,” “right,” and “middle” used in this specification are merely for clarity of description and are not intended to limit the scope of this disclosure. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of this disclosure.

[0019] Resin-PUR composites are a type of product using in-mold spraying technology, primarily used in automotive interior and exterior parts. The core layer is made of resin, and the outer layer is made of PUR material, both materials being injection molded. Since the parts are produced continuously, the material bundles at the joints are wide and thick, requiring subsequent trimming. However, the outer PUR material has a relatively uniform thickness, representing a thin-layer bond. The production process for resin-PUR composites is as follows: ① PC material pre-drying - PUR material pre-heating in a pipeline; ② Injection molding of the PC skeleton layer, the mold rotating to the PUR end, and PUR spraying onto the cavity surface; ③ PUR curing, PC skeleton layer injection molding; ④ Product removal, static electricity removal, and hot shearing. Currently, CNC machining is commonly used, but CNC machining easily leads to chipping, dents, and scratches from debris. Furthermore, due to the small cutting distance, delamination can occur during the cutting of the composite material, affecting product quality. Therefore, a device is needed that prevents product delamination during cutting.

[0020] like Figure 1-4 As shown, it illustrates a cutting device for a resin-PUR composite product provided by this utility model, including... The rack 1 contains an electrical control box 2 and a temperature controller 3. The hot cutting assembly is mounted on the frame 1, including an operating platform mounted on the frame 1, and a cutting mechanism is provided in the middle of the operating platform; The cutting mechanism includes an inverted L-shaped upper blade holder 9 fixed on the frame 1, and a heated lower blade holder 10 opposite to the upper blade holder 9. The heated lower blade holder 10 is connected to a temperature controller. A longitudinal slide rail 11 is provided on the inner side of the support arm of the upper blade holder 9. The side of the heated lower blade holder 10 has a slider 12 that cooperates with the longitudinal slide rail 11. A longitudinally driven cylinder 13 is provided on the frame 1. The driving end of the cylinder 13 is connected to the bottom of the heated lower blade holder 10. A fixed blade 14 is provided on the upper blade holder 9, and a moving blade 15 is provided on the heated lower blade holder 10. The blades of the fixed blade 14 and the moving blade 15 are perpendicular to each other. A temperature sensing probe connected to the temperature controller 3 is provided inside the fixed blade 14.

[0021] The temperature sensing probe is installed in the receiving hole 16 formed in the mounting part of the moving knife 15 for heating the moving knife 15. The cylinder 13 must meet the requirements of a length of 70-90mm, a width of 50-80mm, and a height of 133-180mm. The knife heating temperature is between 200-300℃. The cylinder 13 uses an air pressure between 4-6mpa. The hot knife surface is coated with Teflon.

[0022] Compared with traditional cutting devices, this device uses a hot knife structure with upper and lower pressure. By applying pressure to the moving knife 15 on the resin core side and the fixed knife 14 on the PUR material side, a combination of hot cutting by the moving knife 15 and cold cutting by the fixed knife 14 is formed. This achieves the cutting of the mold that combines the resin core and PUR material, ensuring a smooth and flat cutting surface and preventing delamination of the joint surface, thus ensuring product quality and reducing costs.

[0023] To improve the stability of the device structure, the operating platform is a segmented structure, including a front frame 4 and a rear frame 5. The rear frame 5 has a frame groove 6, and part of the front frame 4 is fitted into the frame groove 6. The cutting mechanism is set in the frame groove 6. The front frame 4 and the rear frame 5 are respectively fixed to the crossbeam of the frame 1.

[0024] See Figure 3 , Figure 4 As shown, the cutting mechanism is fixed to the longitudinal end face of the front frame 4 by the adjusting plate 8. The tool holder 7 is fixed on the adjusting plate 8. The upper tool holder 9 is set on the side of the tool holder 7. The bottom of the tool holder 7 forms a clamping structure. The cylinder 13 is installed inside the tool structure. The driving end of the cylinder 13 passes upward through the tool holder 7. The tool holder 7 can stably fix the upper tool holder 9 and the heated lower tool holder 10 and ensure that they are always on the same vertical plane. At the same time, the clamping structure at the bottom restricts the position of the cylinder 13 to ensure the consistency of the positions of the three components. The adjusting plate 8 is also provided with a keyway, which can adjust the position of the tool holder mechanism up and down to adapt to the cutting of the product.

[0025] To ensure the recycling of waste materials after cutting, a waste recycling bin 17 is also provided inside the frame 1. The upper opening of the waste recycling bin 17 is opposite to the frame groove 6. The bottom of the frame 1 is provided with casters 18, which can facilitate the movement of the hot cutting device and improve the flexibility of use.

[0026] During operation, the cutting mechanism is first reset, with the blade of the moving blade 15 aligned with the working platform. The power is then turned on, and the product to be cut is placed on the working platform, moving from the front frame 4 to the rear frame 5. The front end of the mounting hole near the cutting surface on the product aligns with the end line of the front frame 4, ensuring the first cutting surface of the waste material is opposite the blade of the cutting blade. The moving blade 15 is set to a temperature of 230℃, which closely matches the melting point of the PC layer (resin core outer layer) (approximately 220-240℃), allowing for precise local melting of the PC layer. Under the upward thrust of the hot blade, the molten PC layer naturally folds upward and wraps around the PUR layer at the root of the material, forming a "resin-PUR" physical interlocking structure. The moving blade 15 is then driven by the cylinder 13 to cut the product. The product is pushed forward, with the rear end of the mounting hole near the cutting surface on the product aligning with the end line of the front frame 4, ensuring the second cutting surface of the waste material is opposite the blade of the cutting blade. The moving blade 15 is then driven by the cylinder 13 to cut the product.

[0027] This device has at least the following advantages: The core parameters are precisely controllable, resulting in high quality consistency: The key parameters of hot shearing (hot blade temperature 230℃, cylinder pressure 5MPa) can be precisely set and monitored in real time through the equipment. Temperature fluctuations can be controlled within ±5℃, and pressure fluctuations ≤0.2MPa, avoiding quality fluctuations caused by parameter instability. In contrast, the quality of CNC milling is easily affected by factors such as tool wear (e.g., tool dulling leading to changes in cutting force) and programming accuracy (e.g., path deviation leading to shearing position offset), resulting in poor consistency. Optimized equipment structure reduces process interference: The design of fixing the hot knife to the moving knife side allows the white powder generated by PUR hot melting to fall naturally, avoiding powder accumulation between the knife and the product, and reducing uneven shearing surface caused by powder adhesion; at the same time, the Teflon coating (polytetrafluoroethylene) on the surface of the hot knife has low viscosity, which can prevent molten material from sticking to the knife, reduce the frequency of knife cleaning, and ensure production continuity. Standardized operating procedures and low learning curve: The "pre-cutting of the material - precise positioning - step-by-step cutting" process of hot shearing can form a standardized SOP. Operators only need to complete the product positioning as required (X phase and Y phase alignment with the reference), and the equipment can automatically complete the shearing without complex programming or skill accumulation. In contrast, CNC milling requires professional personnel to program toolpaths and adjust parameters, which requires high operator skills, and programming errors can easily lead to batch scrap. Low tool maintenance costs: Compared to the frequent tool changes and maintenance in CNC milling, tool maintenance in hot shearing is simpler and more efficient. The Teflon coating on the hot tool surface is highly durable, requiring only an inspection every 5,000 pieces sheared, eliminating the need for frequent replacements. The clearance calibration cycle for the upper and lower blades is weekly, and the operation is simple, requiring only basic tools and no professional technicians. This not only reduces maintenance labor costs but also lowers the material costs of tool replacement, further improving the economics of hot shearing.

[0028] Although the present disclosure has been described in detail above with general descriptions and specific embodiments, modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, such modifications or improvements made without departing from the spirit of the present disclosure are all within the scope of protection claimed by the present disclosure.

Claims

1. A cutting device for a resin-PUR composite product, characterized in that, include The frame contains an electrical control box and a temperature controller. The hot cutting assembly is mounted on the frame, including an operating platform mounted on the frame, and a cutting mechanism is provided at the middle position of the operating platform; The cutting mechanism includes an inverted L-shaped upper blade holder fixed on the frame, and a heated lower blade holder opposite to the upper blade holder. The heated lower blade holder is connected to a temperature controller. A longitudinal slide rail is provided on the inner side of the support arm of the upper blade holder. The side of the heated lower blade holder has a slider that cooperates with the longitudinal slide rail. A longitudinally driven cylinder is provided on the frame. The driving end of the cylinder is connected to the bottom of the heated lower blade holder. A fixed blade is provided on the upper blade holder, and a moving blade is provided on the heated lower blade holder. The blades of the fixed blade and the moving blade are perpendicular to each other. A temperature sensing probe connected to the temperature controller is provided inside the fixed blade.

2. The cutting device for the resin-PUR composite product according to claim 1, characterized in that, The operating platform includes a front frame and a rear frame. The rear frame has a frame groove, and part of the front frame structure is fitted into the frame groove. The cutting mechanism is disposed in the frame groove.

3. The cutting device for the resin-PUR composite product according to claim 2, characterized in that, The cutting mechanism is fixed to the longitudinal end face of the front frame by an adjusting plate. The tool holder assembly is fixed on the adjusting plate. The upper tool holder is set on the side of the tool holder assembly. The bottom of the tool holder assembly forms a clamping structure. The cylinder is installed inside the tool structure, and the driving end of the cylinder passes upward through the tool holder assembly.

4. The cutting device for the resin-PUR composite product according to claim 3, characterized in that, The mounting part of the moving knife is provided with a transverse receiving hole, and the temperature sensing probe is provided in the receiving hole.

5. The cutting device for the resin-PUR composite product according to claim 4, characterized in that, The frame is also equipped with a waste recycling bin, the upper opening of which is opposite to the frame slot.

6. The cutting device for the resin-PUR composite product according to claim 1, characterized in that, The bottom of the frame is equipped with casters.

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