Fine adjustment device for positioning pin of hot stamping die

Abstract

The invention relates to the technical field of dies, in particular to a hot stamping die positioning pin fine adjustment device which comprises a positioning pin, a lead screw, a support, a circular truncated cone, a guide rail, a sliding block, a translation servo motor and a rotation servo motor. Compared with the prior art, the servo motor is controlled to automatically achieve movement of the positioning pin at any position in a circle, shutdown operation or manual operation is not needed, the lead screw structure can achieve high-precision fine adjustment of the positioning pin, therefore, positioning of a high-temperature blank before stamping is adjusted, the situation that the edge size of a plate is unqualified due to inaccurate positioning of the plate is reduced, and the production efficiency is improved. The cutting-free of the plate material is realized; the two micro motors can act simultaneously, so that the time for fine adjustment of the positioning pin is shortened. The method has the characteristics of high precision and high reliability, has high technical advantages and practical application value, and provides support for cost reduction and efficiency improvement of a hot stamping cutting-free process and accurate stamping forming.

Description

Technical Field

[0001] This invention relates to the field of mold technology, specifically to a fine-tuning device for positioning pins in hot stamping molds. Background Technology

[0002] In modern stamping manufacturing, locating pins are typically pressed directly into the die base or mounted with an interference fit, making their position completely unadjustable. Alternatively, they can be "coarsely adjusted" by machining shims of different thicknesses or replacing bushings with different outer diameters. This remains a discrete, stepped adjustment with low precision and cumbersome operation. During the reciprocating stamping process, locating pins or blocks come into contact with the workpiece or oxidize at high temperatures, leading to wear over time. This wear causes deviations in the contact position between the locating pins / blocks and the workpiece, resulting in decreased positioning accuracy. In hot stamping processes, inaccurate initial positioning of the sheet metal within the die can cause dimensional deviations in the formed part, requiring rework or resulting in scrap, increasing costs and production time. The positioning of the workpiece is primarily controlled by locating pins, which are the core components ensuring accurate and repeatable positioning of the sheet metal within the die. Even minor deviations in their position can lead to a series of serious problems, creating a rigid demand for "fine-tuning."

[0003] With the development of non-cutting processes, conventional methods require machine shutdowns when deviations occur in non-cutting parts to identify the cause and find solutions. However, inspecting the mold positioning system and the sheet metal clamping system on the production line not only affects production efficiency but also easily leads to batches of scrap. Using a positioning fine-tuning device, a micro-motor is controlled based on visual feedback from an industrial camera and computer commands to adjust the position of the positioning pins, ensuring that the stamped sheet metal meets the non-cutting requirements. This avoids increased costs and time due to additional cutting processes, reduces scrap rates, and improves production efficiency.

[0004] Currently, there are some manual mold positioning pin adjustment mechanisms; for example, the mold positioning pin adjustment mechanism disclosed in patent publication number CN223222323U includes a fixed block, an adjusting block, a positioning pin, an adjusting screw, and steel plates. The fixed block is installed on the mold, and the positioning pin is installed on the adjusting block. The distance between the fixed block and the adjusting block is adjusted by removing or adding steel plates, thereby adjusting the position of the positioning pin on the mold. Since positioning can be achieved by aligning the two planes of the adjusting block and the fixed block, only steel plates of the same thickness can be removed to achieve effective adjustment of the positioning pin. Therefore, the positioning pin position can only be adjusted in a straight line, and it cannot achieve adjustment at any angle or point, which has great limitations. Furthermore, this device requires manual adjustment, which requires stopping the machine during production, reducing production efficiency. Moreover, this device controls the positioning of the positioning pin by adjusting the thickness of the steel plates, which has very low precision and cannot achieve high-precision positioning.

[0005] It is evident that existing technologies cannot achieve real-time adjustment of the positioning pins based on information fed back from the monitoring system. Therefore, it is necessary to design a fine-tuning device for the positioning pins of hot stamping dies, which can adjust the position of the positioning pins by controlling a servo motor based on the edge information detected by the detection system, thereby facilitating the adjustment of the blank's positioning and improving the dimensional accuracy of the parts. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a fine-tuning device for the positioning pin of a hot stamping die, which solves the problem of the traditional positioning pin being unadjustable, realizes real-time adjustment of the blank positioning, improves the dimensional accuracy of the formed sheet, and provides support for the cut-free process and high-precision stamping forming process.

[0007] To achieve the above objectives, this invention provides a fine-tuning device for a positioning pin in a hot stamping die, comprising a positioning pin, a lead screw, a bracket, a frustum, a guide rail, a slider, a translational servo motor, and a rotational servo motor. The rotational servo motor is installed inside the die, and its shaft is connected to the center of the frustum. The top of the frustum is fixed with the translational servo motor, the guide rail, and the bracket, which is installed at the center of the top of the frustum. One end of the guide rail is located below the bracket, and the other end extends towards the translational servo motor. The slider is slidably mounted on the guide rail, and a lead screw connects the slider to the shaft of the translational servo motor. A positioning pin is mounted on the top of the slider. The upper part of the bracket is a cylindrical structure with a U-shaped groove extending to the bottom. The opening direction of the U-shaped groove is the same as that of the guide rail. The positioning pin is movably mounted in the U-shaped groove, with its upper end protruding from the top of the cylindrical structure. The rotational servo motor controls the rotation angle of the frustum, and the translational servo motor controls the radial movement distance of the positioning pin, enabling the positioning pin to move to any position within a polar coordinate range with the center of the frustum as the pole.

[0008] One end of the lead screw is fixed to the shaft of the translation servo motor, and the other end of the lead screw is threaded to the slider. The shaft of the translation servo motor drives the lead screw to rotate, and the rotation is converted into the sliding of the slider along the guide rail through the lead screw, thereby driving the positioning pin to move in the U-shaped groove.

[0009] The lead screw is connected to the shaft of the translation servo motor by a key.

[0010] The upper outer side of the positioning pin is provided with a protective cover, which fits against the top of the cylindrical structure of the bracket to prevent hot air and debris from entering the central through hole of the bracket and damaging the device during hot stamping.

[0011] The slider and the positioning pin are connected by threads.

[0012] The frustum is connected to the translation servo motor, the frustum to the rotation servo motor, the frustum to the guide rail, and the frustum to the bracket by bolts.

[0013] Compared with existing technologies, this invention automatically moves the positioning pin to any position within a circle using a servo motor, eliminating the need for machine stoppage or manual operation. The lead screw structure allows for high-precision fine-tuning of the positioning pin, thereby adjusting the positioning of the high-temperature blank before stamping. This reduces sheet metal edge dimension defects caused by inaccurate positioning, achieving sheet metal cutting-free operation. Two micro-motors can operate simultaneously, shortening the fine-tuning time of the positioning pin. This invention features high precision and high reliability, possessing significant technical advantages and practical application value, providing support for cost reduction and efficiency improvement in hot stamping cutting-free processes and precision stamping forming. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 This is an exploded view of the present invention after the motor has been removed.

[0016] Figure 3 This is a schematic diagram of the installation of the present invention in a mold.

[0017] Figure 4 This is a schematic diagram illustrating the principle of fine-tuning the positioning pin position in this invention.

[0018] Figure 5 This is a cross-sectional view of the present invention. Detailed Implementation

[0019] The present invention will now be further described with reference to the accompanying drawings.

[0020] See Figure 1 , Figure 2 , Figure 3 and Figure 5 This invention relates to a fine-tuning device for a positioning pin in a hot stamping die, comprising a positioning pin, a lead screw, a bracket, a frustum, a guide rail, a slider, a translational servo motor, and a rotational servo motor. The rotational servo motor 8 is installed inside the die 10, and its shaft is connected to the center of the frustum 5. A translational servo motor 6, a guide rail 7, and a bracket 2 are fixed to the top of the frustum 5. The bracket 2 is installed at the center of the top of the frustum 5. One end of the guide rail 7 is located below the bracket 2, and the other end of the guide rail 7 extends towards the translational servo motor 6. The slider 3 is slidably mounted on the guide rail 7, and the slider 3 is connected to the translational servo motor 6. The shafts of the servo motor 6 are connected by a lead screw 4. The top of the slider 3 is equipped with a positioning pin 1. The upper part of the bracket 2 is a cylindrical structure with a U-shaped groove 21 that extends to the bottom. The opening direction of the U-shaped groove 21 is the same as that of the guide rail 7. The positioning pin 1 can be installed in the U-shaped groove 21 in a translational manner, and the upper end of the positioning pin 1 protrudes from the top of the cylindrical structure. The rotation servo motor 8 controls the rotation angle of the frustum 5, and the translation servo motor 6 controls the radial movement distance of the positioning pin 1, so as to realize the movement of the positioning pin 1 at any position within the polar coordinate range with the center of the frustum 5 as the pole.

[0021] One end of the lead screw 4 is fixed to the shaft of the translation servo motor 6, and the other end of the lead screw 4 is threadedly connected to the slider 3. The shaft of the translation servo motor 6 drives the lead screw 4 to rotate, and the rotation is converted into the sliding of the slider 3 along the guide rail 7 through the lead screw 4, thereby driving the positioning pin 1 to move in the U-shaped groove 21 to achieve high-precision transmission.

[0022] The lead screw 4 and the shaft of the translation servo motor 6 are connected by key 9 for better power transmission.

[0023] The purpose of bracket 2 is to reduce the size of the holes and reduce the possibility of hot air and debris entering the device. To further prevent hot air and debris from entering the central through hole of bracket 2 and damaging the device during hot stamping, a protective cover 11 is provided on the upper outer side of the positioning pin 1, and the protective cover 11 fits against the top of the cylindrical structure of bracket 2.

[0024] The slider 3 and the positioning pin 1 are connected by a thread, and the positioning pin 1 moves horizontally along with the slider 3. The frustum 5 is connected to the translation servo motor 6, the frustum 5 to the rotation servo motor 8, the frustum 5 to the guide rail 7, and the frustum 5 to the bracket 2 by bolts.

[0025] The translation servo motor 6 and the rotation servo motor 8 can operate independently, reducing the adjustment time of the positioning pin. For example, if the control system calculates that the positioning pin needs to be adjusted radially by 0.25mm and rotated clockwise by 30°, it can simultaneously control the number of rotations of the translation servo motor 6 and the rotation servo motor 8. That is, the distance or angle the positioning pin moves when the motor rotates once is calculated by the control terminal, and the output signal controls the motor rotation. Using servo motors can achieve precise braking of the motor rotation.

[0026] See Figure 4 The control system calculates the distance the positioning pin needs to move and adjusts its direction and path by controlling the translation servo motor 6 and the rotation servo motor 8. The principle of position adjustment is based on establishing a Cartesian coordinate system with the length of the press as the x-axis and the width as the y-axis, using the center of the mounting support frustum as the pivot point, and then establishing a polar coordinate system with the center of the mounting bracket frustum as the pole. First, the coordinates of the positioning pin in the Cartesian coordinate system are determined. Convert to polar coordinates Then determine the coordinates of the position to be adjusted. Convert to polar coordinates Translational momentum is The amount of rotation is The formula for transforming rectangular coordinates to polar coordinates is: , , Let be the arctangent function in the four quadrants. If the positioning pin moves by s units when the servo motor controlling translation rotates one revolution, then the servo motor controlling translation needs to rotate R / s revolutions. If the positioning pin rotates by an angle α around the center of the supporting frustum when the servo motor controlling rotation rotates one revolution, then the servo motor controlling rotation needs to rotate... lock up.

[0027] The rotation angle is achieved by rotating a frustum. The rotation servo motor 8 drives the frustum to rotate around its center. The frustum drives all the components mounted on it to rotate together. It's like the entire device is a polar coordinate system with the center of the frustum as the pole. The translation servo motor 6 controls the radius of movement, and the rotation servo motor 8 controls the angle, thus enabling the positioning pin to move at any point within a circle.

[0028] Translational momentum is achieved through a lead screw drive. The translational servo motor 6 drives the lead screw to rotate, and the lead screw converts the rotation into linear motion of the slider along the guide rail. The slider then drives the positioning pin to move linearly together.

[0029] This invention controls a servo motor to automatically move the positioning pin to any position within a circle, eliminating the need for machine stoppage or manual operation. The lead screw structure allows for high-precision fine-tuning of the positioning pin, thereby adjusting the positioning of the high-temperature blank before stamping. This reduces the risk of inaccurate sheet metal positioning leading to non-compliant edge dimensions, achieving sheet metal cutting-free operation. Two micro-motors can operate simultaneously, shortening the time required for fine-tuning the positioning pin. This invention features high precision and high reliability, possessing significant technical advantages and practical application value, providing support for cost reduction and efficiency improvement in hot stamping cutting-free processes and precision stamping forming.

Claims

1. A fine-tuning device for a positioning pin of a hot stamping die, comprising a positioning pin, a lead screw, a bracket, a frustum, a guide rail, a slider, a translation servo motor, and a rotation servo motor, characterized in that: A rotary servo motor (8) is installed inside the mold (10). The shaft of the rotary servo motor (8) is connected to the center of the frustum (5). A translation servo motor (6), a guide rail (7), and a bracket (2) are fixed on the top of the frustum (5). The bracket (2) is installed at the center of the top of the frustum (5). One end of the guide rail (7) is located below the bracket (2), and the other end of the guide rail (7) extends toward the translation servo motor (6). A slider (3) is slidably installed on the guide rail (7), and the slider (3) is connected to the shaft of the translation servo motor (6) by a lead screw (4). The top of the slider (3) The bracket (2) is equipped with a positioning pin (1). The upper part of the bracket (2) is a cylindrical structure with a U-shaped groove (21) that extends to the bottom. The opening direction of the U-shaped groove (21) is the same as the setting direction of the guide rail (7). The positioning pin (1) can be installed in the U-shaped groove (21) in a horizontal position, and the upper end of the positioning pin (1) protrudes from the top of the cylindrical structure. The rotation servo motor (8) controls the rotation angle of the frustum (5), and the translation servo motor (6) controls the radial movement distance of the positioning pin (1), so that the positioning pin (1) can move at any position within the polar coordinate range with the center of the frustum (5) as the pole.

2. The hot stamping die positioning pin fine-tuning device according to claim 1, characterized in that: One end of the lead screw (4) is fixed to the shaft of the translation servo motor (6), and the other end of the lead screw (4) is threaded to the slider (3). The shaft of the translation servo motor (6) drives the lead screw (4) to rotate, and the rotation is converted into the sliding of the slider (3) along the guide rail (7) through the lead screw (4), thereby driving the positioning pin (1) to move in the U-shaped groove (21).

3. The hot stamping die positioning pin fine-tuning device according to claim 2, characterized in that: The lead screw (4) is connected to the shaft of the translation servo motor (6) via a key (9).

4. The hot stamping die positioning pin fine-tuning device according to claim 1, characterized in that: The upper outer side of the positioning pin (1) is provided with a protective cover (11), which is attached to the top of the cylindrical structure of the bracket (2) to prevent hot air and debris from entering the central through hole of the bracket (2) and damaging the device during hot stamping.

5. The hot stamping die positioning pin fine-tuning device according to claim 1, characterized in that: The slider (3) and the positioning pin (1) are connected by threads.

6. The hot stamping die positioning pin fine-tuning device according to claim 1, characterized in that: The frustum (5) is bolted to the translation servo motor (6), the frustum (5) is bolted to the rotation servo motor (8), the frustum (5) is bolted to the guide rail (7), and the frustum (5) is bolted to the bracket (2).

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