A hot stamping device and method

Abstract

The present application provides a hot stamping equipment and method, belongs to surface decoration technical field, including bottom plate, frame, stamping mechanism, horizontal slide rail, horizontal motor, bottom die, heavy load guide rail and weakening line pressure frame;Frame is fixed on both sides of bottom plate, horizontal slide rail and heavy load guide rail are equipped on frame;Horizontal motor is arranged on stamping mechanism, horizontal motor output shaft is matched with horizontal slide rail, stamping mechanism is matched with heavy load guide rail slidingly;Bottom die is arranged on bottom plate, weakening line pressure frame is arranged on bottom plate, the present application adopts linear servo motor to provide accurate stamping pressure and depth control;Cold and hot integrated temperature control system, fast heating and cooling;Movable stamping head, can stamp 1m*1.5m size leather;Material self-adapting, with leather thickness automatic compensation function, automatically adjusts stamping parameter according to the thickness, soft and hard of material;Through a variety of positioning means, realize accurate stamping position;Temperature and pressure adjusting range is large, can realize the stamping of various leather and other materials.

Description

Technical Field

[0001] This invention belongs to the field of surface decoration technology, specifically a hot stamping equipment and method. Background Technology

[0002] Leather hot stamping allows automakers to add personalized patterns, logos, or decorative elements to interior parts to meet consumer demand for personalization. This helps enhance the brand value and appeal of automobiles. Current leather hot stamping equipment in the industry suffers from the following problems: Inaccurate pressure control: The widespread use of cylinders or hydraulic levers makes it difficult to precisely control pressure and displacement; Fluctuating stamping quality: Stamping quality fluctuates due to variations in leather thickness and thermal conductivity; Poor material compatibility: Commonly used automotive interior materials such as genuine leather, fabrics, and synthetic leathers (PU / PVC / TPO) are not interchangeable; Inaccurate stamping position: Patterns or logos are difficult to precisely position on the leather; Small stamping area, unable to accommodate large-sized leather pieces. Summary of the Invention

[0003] To address the above issues, this invention provides a hot stamping device and method. It employs a linear servo motor to provide precise stamping pressure and depth; a combined heating and cooling temperature control system for rapid heating and cooling; a movable stamping head with a working area of ​​1m x 1.5m; material self-adaptation with automatic leather thickness compensation, allowing for automatic adjustment of stamping parameters based on material thickness and hardness to achieve consistent stamping results; compatibility with multiple materials, enabling stamping of genuine leather, PU / PVC / TPO materials through a wide range of precise temperature and pressure adjustments; high production flexibility with automatic mold changing, requiring only 5 minutes for product switching; improved stamping quality stability and consistency; adaptability to various materials and types of stamping patterns; enhanced personalization of interior products; and improved market competitiveness.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A hot stamping device includes: a base plate, a frame, a hot stamping mechanism, a horizontal slide rail, a horizontal motor, a bottom mold, a heavy-duty guide rail, and a weakening line pressure frame; wherein, the frame is fixed on both sides of the base plate, and the horizontal slide rail and the heavy-duty guide rail are provided on the frame; the horizontal motor is mounted on the hot stamping mechanism, the output shaft of the horizontal motor cooperates with the horizontal slide rail, and the hot stamping mechanism slides with the heavy-duty guide rail; the bottom mold is mounted on the base plate, and the weakening line pressure frame is mounted on the base plate;

[0006] The hot stamping mechanism includes a vertical motor, a heating plate, a hot stamping head, a vertical guide rail, and a vertical motor cylinder. The vertical motor cylinder slides with the vertical guide rail, and a heating plate is provided at the end of the vertical motor cylinder. The hot stamping head is fixed on the heating plate.

[0007] The vertical motor is equipped with a pressure controller and an acceleration sensor, which can continuously monitor the pressure during the descent of the hot stamping head.

[0008] Furthermore, the bottom mold is equipped with vacuum holes;

[0009] Furthermore, the bottom mold is equipped with cooling water channels or air-cooled channels;

[0010] Furthermore, a heating element is provided inside the bottom mold; a punch is provided on the bottom mold;

[0011] Furthermore, the bottom mold also has matching integrated blocks, which can be installed at any position on the surface of the bottom mold.

[0012] A hot stamping method includes the following steps:

[0013] S1: Install the base mold onto the equipment base plate and fix it in place; the horizontal motor drives the hot stamping mechanism to move to the specified position; turn on the cooling water or cooling air to reach the specified temperature; heat the hot stamping head to the set temperature; lay the leather to be hot stamped flat on the base mold, position it and fix it in place;

[0014] The S2 vertical motor drives the hot stamping head to descend. When it comes into contact with the leather surface, it performs material adaptive control, which can automatically sense the hot stamping depth according to different materials. The linearization of the hot stamping depth can ensure the precise control of speed and depth during the hot stamping process.

[0015] After the S3 hot stamping is completed, the vertical motor drives the hot stamping head to rise.

[0016] Furthermore, in step S2, the material adaptive control specifically involves setting different "compaction pressures" for different materials based on experiments. The pressure is continuously monitored as the vertical motor descends. When the pressure reaches the compaction pressure, the system records the current position and sets it as the compaction zero point. Then, based on the compaction zero point, the system continues to move downwards by a specified distance to achieve a constant compaction hot stamping depth, ensuring consistent hot stamping effects.

[0017] Furthermore, in step S2, the depth linearization specifically involves the vertical motor having a built-in acceleration sensor that detects nonlinear pressure changes during the hot stamping process and immediately feeds back to the control system for intervention, thereby achieving a stable and accurate hot stamping depth.

[0018] Furthermore, the vertical motor has a built-in pressure sensor with a pressure range of 50KN-600KN, a displacement range of 10cm-100cm, and a speed range of 1-500mm / s.

[0019] Furthermore, the heating plate temperature is 100℃~300℃, the hot stamping depth is 0.5mm-3mm, the holding time is 0-300s, the hot stamping pressure is 0.1Mpa~20Mpa, the hot stamping speed is 0.1~10mm / s, and the cooling temperature is 0-30℃.

[0020] Compared with existing technologies, it has the following beneficial effects:

[0021] Material self-adaptation: It automatically adjusts the hot stamping parameters according to the thickness and hardness of the material to achieve a consistent hot stamping effect; Compatible with multiple materials: Through a wide range and precise temperature and pressure adjustment, it can hot stamp genuine leather, PU / PVC / TPO materials; Movable hot stamping head: The working range reaches 0.7m*0.5m; Quick mold change: It adopts an automatic mold change method, and the product changeover only takes 5 minutes, improving manufacturing capabilities; It improves the stability and consistency of hot stamping quality; It adapts to multiple materials and multiple types of hot stamping patterns; It enhances the personalization of interior products and improves market competitiveness. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the device of the present invention.

[0023] Figure 2 This is a front view structural diagram of the device of the present invention.

[0024] In the picture:

[0025] 1-Base plate; 2-Frame; 3-Hot stamping mechanism; 4-Horizontal motor; 5-Horizontal slide rail; 6-Bottom mold; 7-Reduced line pressure frame; 8-Heavy-duty guide rail; 301 Vertical motor; 302 Heating plate; 303 Hot stamping head; 304 Vertical guide rail; 305 Vertical motor cylinder. Detailed Implementation

[0026] It should be noted that in the description of this invention, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation.

[0027] In this invention, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; a connection can be a mechanical connection or an electrical connection; a link can be a direct connection or an indirect connection through an intermediate medium, and can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0028] A hot stamping device includes: a base plate 1, a frame 2, a hot stamping mechanism 3, a horizontal motor 4, a horizontal slide rail 5, a bottom mold 6, a weakened line pressure frame 7, and heavy-duty guide rails 8. The base plate 1 supports the entire device structure. The frame 2 is fixed on both sides of the base plate. The frame 2 is provided with the horizontal slide rail 5 and two heavy-duty guide rails 8. The horizontal slide rail 5 serves as a guide, and the heavy-duty slide rails 8 serve as a support. The hot stamping mechanism 3 is fixedly connected to the horizontal motor 4. The output shaft of the horizontal motor 4 cooperates with the horizontal slide rail 5. The hot stamping mechanism 3 is slidably connected to the heavy-duty guide rails 8. The horizontal motor 4 can drive the hot stamping mechanism 3 to reciprocate along the slide rail.

[0029] The hot stamping mechanism 3 includes a vertical motor 301, a heating plate 302, a hot stamping head 303, a vertical guide rail 304, and a vertical motor cylinder 305. The vertical motor cylinder 305 is slidably engaged with the vertical guide rail 304. The heating plate 302 is provided at the end of the vertical motor cylinder, and the hot stamping head 303 is fixed on the heating plate 302.

[0030] The bottom mold 6 is fixed on the base plate 1, allowing for quick mold changes.

[0031] The bottom mold has six sections with vacuum holes for securing the leather (vacuum zone);

[0032] The bottom mold has six areas with cooling water channels or air cooling channels for cooling the leather (cooling zone);

[0033] Heating tubes are installed in six areas of the bottom mold to heat the leather (heated area);

[0034] The bottom mold has six sections with punches installed, and quick-connect fittings for vacuum, cooling water, compressed air, and power supply are provided on the bottom mold.

[0035] The leather hot stamping area of ​​the base mold 6 can be one or a combination of vacuum zone, cooling zone, heating zone, and punch. The hot stamping area is installed on the base mold using an independent integrated block, which can be quickly switched. The weakened line pressure frame 7 is fixed to the edge of the base mold 6. It is a frame with a specific shape and a hollow center. It moves up and down by a cylinder and its function is to provide positioning indicators for subsequent processes.

[0036] Specific work steps:

[0037] Connect the mold changing trolley to the equipment base plate 1, push the bottom mold onto the equipment base plate, manually insert the positioning pin, close the clamps, connect the quick-connect connector, and move the mold changing trolley out.

[0038] The equipment automatically identifies the program number, retrieves the corresponding parameters, and the horizontal motor drives the hot stamping mechanism to move to the specified position.

[0039] Press the cooling button to turn on the cooling water or cooling air. When the corresponding cooling temperature is reached, the cooling ready indicator light will illuminate.

[0040] Secure the hot stamping head to the bottom of the heating plate with screws and start heating at the specified temperature. Once the specified temperature is reached, the heating ready indicator light will illuminate.

[0041] Lay the leather to be heat-pressed flat on the lower mold and position it along the edge contour. Then press the vacuum button to firmly attach the leather. After pressing the clamping button, the clamping plate presses down to further fix the leather.

[0042] Press the start button, and the vertical motor will drive the hot stamping head down. When it comes into contact with the leather surface, it will begin hot stamping according to the preset parameters (speed, pressure, time, depth).

[0043] Parameter settings can be done in stages, such as using different pressures or holding for different times at different depths;

[0044] Due to fluctuations in leather thickness and hardness, the hot stamping effect can be inconsistent. This equipment has added a "zero-point tracking" function, which means that the pressure is continuously monitored during the descent of the hot stamping head. When a certain set value is reached, the leather is completely "pressed" and the hot stamping is performed with that point as the "zero point". This can achieve stable and consistent hot stamping quality.

[0045] After the hot stamping reaches the final position, and after a period of pressure holding, the vertical motor drives the hot stamping head to rise.

[0046] During the hot stamping process, the weakening line pressing frame descends simultaneously; after the hot stamping is completed, the operator first pastes the barcode paper with scale lines onto the cutout area of ​​the pressing frame, and then presses the button to open the pressing frame, cancel the vacuum, and open the clamp.

[0047] Remove the stamped leather and place it on the equipment cart, ready for the next cycle.

[0048] During mold changing, the movements of the positioning pins, quick-connect couplings, and clamps can be done manually or automatically by electric, pneumatic, or hydraulic power.

[0049] The left and right movement and locking of the hot stamping mechanism can be driven by a motor, or it can be done by pneumatic, hydraulic or manual means;

[0050] The temperature of the cooling water is between 10℃ and 30℃; the source of the cooling air can be compressed air, air cooler, or vortex refrigeration mechanism.

[0051] Cold air and cold water can share the same channel in the bottom mold;

[0052] The bottom mold hot stamping area can be equipped with heating and cooling channels at the same time, either spaced out or arranged, and the corresponding heating or cooling function is activated depending on the leather material being stamped.

[0053] The connection between the hot stamping head and the heating plate can be achieved by manually tightening screws, mechanically locking with a cylinder, or electromagnetically locking.

[0054] The leather can be positioned and fixed in the base mold using vacuum adsorption, pressure plate clamping, hanging pins, and edge contour positioning.

[0055] The vertical motor uses an integrated servo electric cylinder (also known as a linear motor) with a built-in pressure sensor, which can precisely control pressure, displacement, and speed. The pressure range is 50KN to 600KN, preferably 150KN to 300KN; the displacement range is 10cm to 100cm, preferably 10cm to 20cm; and the speed range is 1 to 500mm / s, preferably 50 to 200mm / s.

[0056] The hot stamping parameters mainly include: heating plate temperature, ranging from 100℃ to 300℃, preferably 100℃ to 200℃; stamping depth, ranging from 0.5mm to 3mm, preferably 0.5mm to 1mm; holding time, ranging from 0 to 300s, preferably 20 to 60s; stamping pressure, ranging from 0.1Mpa to 20Mpa, preferably 0.3 to 1Mpa; stamping speed, ranging from 0.1 to 10mm / s, preferably 0.5 to 1mm / s; and cooling temperature, ranging from 0 to 30℃, preferably 15 to 20℃.

[0057] Gradient parameter control refers to using different parameters at different processing stages (such as different depths) to achieve better hot stamping results. For example, if the hot stamping depth is set to 1mm, a hot stamping speed of 1mm / s can be used at a depth of 0-0.5mm; and a hot stamping speed of 0.5mm / s can be used at a depth of 0.5-1mm.

[0058] The "zero-point tracking" function, also known as the "material self-adaptation" function, refers to using a reference pressure to "detect" the "compaction degree" of the leather material. All leather samples are stamped to the same depth from the same "compaction degree," thus avoiding fluctuations in stamping quality caused by variations in leather thickness and hardness. The reference pressure range is 0.03 MPa to 0.2 MPa, preferably 0.03 MPa to 0.06 MPa.

[0059] The method for achieving adaptive material control is as follows: Due to the loose structure and high resilience of leather, it exhibits an "apparent thickness" under no pressure, but forms a "compacted thickness" under pressure. The most important parameter affecting the hot stamping effect is the compacted stamping depth, which refers to the displacement of the stamping head within the leather's "compacted thickness." Traditional techniques can only achieve a constant stamping position or constant stamping pressure, but cannot achieve a constant compacted stamping depth, thus resulting in fluctuations in stamping quality. The solution of this invention is to first set different "compacting pressures" for different materials based on experiments. A linear servo motor first slowly descends while continuously monitoring the pressure. When the pressure reaches the "compacting pressure," the system records the current position and sets it as the "compacting zero point." Then, based on the compacting zero point, it continues to move downwards a predetermined distance, thus achieving a constant compacted stamping depth and ensuring consistent stamping results.

[0060] The method for achieving linearized hot stamping depth is as follows: Due to the loose structure and high resilience of leather, the rebound force experienced by the hot stamping head during the pressing process is not linear, and this rebound force gradually increases with the increase in hot stamping depth. This nonlinear rebound force acts on the mechanical structure of the linear servo motor through the hot stamping head, causing the motor to be unable to accurately control the speed, ultimately leading to fluctuations in the hot stamping depth. The solution of this invention is: the linear servo motor has a built-in acceleration sensor. When it detects nonlinear pressure changes during the hot stamping process, it immediately feeds back to the control system for intervention, thereby achieving a stable and accurate hot stamping depth.

[0061] The purpose of the weakening line clamping frame is to provide positioning marks for the next process. In this application, the purpose is to position the weakening line during the leather upholstery process of the dashboard. Positioning marks can be either affixed with a barcode with graduated lines or a hydrolytic marker.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hot stamping method of a hot stamping apparatus, characterized by, The application relates to a hot stamping device and a hot stamping method. The device comprises a base plate, a frame, a hot stamping mechanism, horizontal sliding rails, a horizontal motor, a bottom die, heavy-load guide rails and a weakened line pressing frame; the frame is fixed on both sides of the base plate, the horizontal sliding rails and the heavy-load guide rails are arranged on the frame; the horizontal motor is arranged on the hot stamping mechanism, the output shaft of the horizontal motor is matched with the horizontal sliding rails, the hot stamping mechanism is slidably matched with the heavy-load guide rails; the bottom die is arranged on the base plate and can be quickly replaced; the weakened line pressing frame is arranged on the base plate and is a hollow frame in the middle; the weakened line pressing frame is moved up and down by a cylinder and provides positioning indication for a subsequent process. The hot stamping mechanism comprises a vertical motor, a heating plate, a hot stamping head, vertical guide rails and a vertical motor cylinder body; the vertical motor cylinder body is slidably matched with the vertical guide rails; the vertical motor cylinder body is provided with the heating plate at the tail end; and the hot stamping head is fixed on the heating plate. The vertical motor is provided with a pressure sensor and an acceleration sensor; the pressure can be continuously monitored during the descending process of the hot stamping head; the bottom die is provided with a vacuum hole; the bottom die is provided with a cooling water channel or an air cooling channel; the bottom die is provided with a heating pipe; and the bottom die is provided with a male die. The hot stamping method comprises the following steps: S1, the bottom die is installed on the base plate of the device and fixed; the horizontal motor drives the hot stamping mechanism to move to a specified position; cooling water or cooling air is connected to reach a specified temperature; the hot stamping head is heated to a specified temperature; and the leather to be hot stamped is laid on the bottom die and positioned and fixed; S2, the vertical motor drives the hot stamping head to descend; when the hot stamping head contacts the surface of the leather, material self-adaptive control is carried out; the hot stamping depth is linearized; the speed and depth precision control in the hot stamping process can be ensured; S3, after the hot stamping is completed, the vertical motor drives the hot stamping head to ascend; In step S2, the material self-adaptive control is specifically that different compaction pressures are set for different materials according to experiments; the pressure is monitored when the vertical motor descends; when the pressure reaches the compaction pressure, the system records the current position and sets the position as a compaction zero point; then the vertical motor continues to move downward by a specified distance on the basis of the compaction zero point to realize constant compaction hot stamping depth and keep the hot stamping effect consistent; In step S2, the hot stamping depth linearization is specifically that when the acceleration sensor built in the vertical motor detects nonlinear pressure change in the hot stamping process, the control system is immediately intervened to realize stable and accurate hot stamping depth.

2. A hot stamping method as claimed in claim 1, characterized in that The pressure range of the pressure sensor built in the vertical motor is 50KN-600KN, the displacement range is 10cm-100cm, and the speed range is 1-500mm / s.

3. A hot stamping method as claimed in claim 2, characterized in that The temperature of the heating plate is 100-300 DEG C, the hot stamping depth is 0.5-3mm, the pressure maintaining time is 0-300s, the hot stamping pressure is 0.1-20Mpa, the hot stamping speed is 0.1-10mm / s, and the cooling temperature is 0-30 DEG C.

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