Mold platen incorporating particle damper, method of manufacture, and die shear forming apparatus

Abstract

The application discloses a die workbench plate integrated with a particle damper, a manufacturing method and a chip cutting forming equipment, the die workbench plate is integrally manufactured with the particle damper, the particle damper is embedded in the interior of the die workbench plate, and the die workbench plate is manufactured by adopting a laser powder bed melting technology; un-melted powder is reserved at a certain position in the laser powder bed melting process, so that a particle powder inner cavity is formed, and the particle damper is integrated in the die workbench plate. The application plays a role in vibration reduction and noise reduction in stamping of the chip cutting forming equipment.

Description

Technical Field

[0001] The present invention relates to the field of chip cutting and rib forming equipment, and in particular to a mold workbench plate of an integrated particle damper, a manufacturing method and chip cutting and rib forming equipment. Background Art

[0002] With the development of society and the advancement of science and technology, people have higher requirements for their working and living environment, and also have higher requirements for vibration reduction of equipment used for production in factories. Chip cutting and forming equipment is an important equipment in the semiconductor chip packaging and testing industry chain. After the chip DIE mold is sealed on the lead frame, this equipment is used to complete the cutting and chip lead forming process. There is huge vibration noise during the stamping process of chip cutting and forming equipment, which affects the processing accuracy and makes the working environment in the workshop noisy, reducing the enthusiasm of factory workers, which can easily lead to a decrease in production efficiency and production competitiveness. At present, the vibration and noise reduction of the high noise of chip cutting and forming equipment during stamping is generally achieved by placing it in a soundproof enclosure or soundproof room to isolate the noise source, but the vibration and noise reduction effect is limited, and it will still cause damage to the human ears of the workers in the workshop.

[0003] Applying particle damping to enhance energy dissipation and modal damping can fundamentally reduce vibration and noise in chip cutting and forming equipment. Particle dampers offer advantages such as low weight impact, insensitivity to ambient temperature, multi-directional operation across a wide frequency range, simplicity, reliability, and low cost. By introducing particle collision friction, structural modal damping can be significantly improved, thereby achieving vibration and noise reduction. However, existing particle dampers are complex to assemble and occupy a considerable amount of space within the equipment's operating area. Summary of the Invention

[0004] In order to overcome the above-mentioned shortcomings and deficiencies of the prior art, the object of the present invention is to provide a mold workbench plate of an integrated particle damper, a manufacturing method and a chip cutting and forming device.

[0005] Another object of the present invention is to provide a method for manufacturing a mold working plate

[0006] Another object of the present invention is to provide a chip cutting and forming device including the mold working plate.

[0007] The purpose of the present invention is achieved through the following technical solutions:

[0008] A mold workbench with an integrated particle damper is provided. The mold workbench and the particle damper are manufactured in an integrated manner, and the particle damper is embedded in the mold workbench.

[0009] Furthermore, the inner cavity of the particle damper is in the shape of a cube, and the particle filling rate is 80% to 95%.

[0010] Furthermore, the cube is further divided into a plurality of cubic cavities, which are used to reduce the excitation conditions of the particle damper and increase the number of effective collisions of particles to enhance energy loss.

[0011] Furthermore, the granular powder material is 316L, and the particle diameter is at least 50 μm.

[0012] A method for manufacturing the mold worktable comprises the following steps:

[0013] The modal vibration model of the mold workbench is established through finite element modal analysis;

[0014] According to the modal vibration model, the modal vibration shapes in the frequency range of 1000-3000 Hz are analyzed to determine the distribution position of the particle damper;

[0015] A model of the additive manufacturing modal workbench is established based on the distribution positions of the particle dampers, and the particle damper cavities are modeled at the determined distribution positions.

[0016] Laser powder bed fusion technology is used to additively manufacture mold worktables.

[0017] Furthermore, the application of laser powder bed fusion technology to additively manufacture the mold worktable is specifically as follows:

[0018] First, a layer of powder is laid, and the powder in the area that needs to be solidified is melted by laser scanning according to the layered cross-sectional pattern of the model;

[0019] Then, the workpiece is lowered a layer, and the next layer of powder is laid. The laser melts and solidifies the powder. The powder laying and laser process are repeated until the additive manufacturing of the entire mold worktable is completed.

[0020] During this manufacturing process, the laser does not scan the solidified metal powder in the cavity area set in the model. Therefore, after the layer-by-layer processing is completed, multiple inner cavities are formed in the modal tool platen, each of which contains unmelted metal powder, realizing the integration of the particle damper inside the mold worktable.

[0021] Furthermore, based on the modal vibration model, the modal vibration shapes in the frequency range of 1000-3000 Hz were analyzed to determine the distribution position of the particle damper, specifically:

[0022] In the frequency range, the vibration amplitude of the workbench is analyzed under the modes of frequency 1403 Hz, frequency 2135 Hz and frequency 3062 Hz, the overlapping area with the largest amplitude is determined, and the particle damper is set.

[0023] Furthermore, the arrangement includes linear distribution, circular distribution or staggered distribution.

[0024] A chip cutting and forming device includes the mold workbench.

[0025] Furthermore, under the strong structural vibration caused by the high-intensity stamping of the chip cutting and forming equipment, the unmelted granular powder inside the particle damper rubs and collides with the granular powder or the granular powder and the inner cavity wall of the particle damper, consuming vibration energy in the process of collision and friction, and converting the vibration energy into friction internal energy and collision kinetic energy, thereby enhancing structural damping, and the mold worktable has strong damping performance.

[0026] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0027] The present invention adopts laser powder bed fusion additive manufacturing technology (LPBF) to directly integrate the particle damper into the interior of the mold worktable. There is no need for additional assembly to install the particle damper. Therefore, the installation and layout position of the particle damper does not need to consider the overall assembly and working conditions of the equipment, and better damping performance is achieved without affecting the processing operation.

[0028] The present invention effectively arranges particle dampers in areas with the greatest vibration response through design, and integrates a mold worktable with multiple particle dampers inside. This acts as a damper under the vibration generated by the high-intensity stamping of chip cutting and forming equipment, effectively reducing vibration and noise, thereby improving the factory production environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is an overall schematic diagram of a chip cutting and forming device described in an embodiment.

[0030] Figure 2 This is the 1403 Hz modal vibration shape structure of the mold worktable described in the embodiment.

[0031] Figure 3 This is the 2135 Hz modal vibration shape structure of the mold worktable described in the embodiment.

[0032] Figure 4 This is the 3062 Hz modal vibration shape structure of the mold worktable described in the embodiment.

[0033] Figure 5 Schematic diagram of the distribution of particle dampers in the mold worktable described in the embodiment.

[0034] Figure 6 This is a schematic structural perspective view of the integrated particle damper mold workbench described in the embodiment.

[0035] Figure 7 Schematic diagram of a single structure of the particle damper inside the mold worktable described in the embodiment. DETAILED DESCRIPTION

[0036] The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

[0037] Example 1

[0038] A mold workbench with an integrated particle damper, specifically an LPBF (Laser Powder Bed Fusion) particle damper mold workbench used for integrated stamping vibration reduction and noise reduction of chip cutting and forming equipment, relates to stamping vibration reduction and noise reduction of chip cutting and forming equipment, and the mold workbench and the particle damper are manufactured in an integrated manner, and the particle damper is embedded in the interior of the mold workbench.

[0039] The particle damper in the present invention is fully integrated and is processed and integrated into the interior of the mold workbench during the additive manufacturing process, so as to avoid affecting the assembly and coordination between the mold workbench and other components of the chip cutting and forming equipment.

[0040] The particle damper integrated in the mold worktable is made of 316L powder material, with a particle diameter of about 50μm and a particle filling rate of 80% to 95%. The particle damper cavity is in the shape of a cube. To increase the number of effective particle collisions to enhance energy loss and reduce the difficulty of simulation, the particle damper cavity is further divided into 4×4×4 small cavities, each of which contains unmelted powder. Figure 7 shown.

[0041] This embodiment also provides a method for manufacturing a mold worktable with an integrated particle damper, comprising the following steps:

[0042] The modal vibration model of the mold workbench is established through finite element modal analysis, which facilitates the further determination of the distribution position of the LPBF particle damper through the modal vibration model;

[0043] The main analysis is on the modal vibration shape in the frequency range of 1000-3000 Hz. The vibration noise generated in this frequency range is the most sensitive frequency range that the human ear can hear.

[0044] like Figure 2 、 Figure 3 and Figure 4As shown in the figure, the modal vibration shape structure of the mold workbench. Analysis shows that under the mode with a frequency of 1403 Hz, the middle of the left and right ends of the mold workbench is greatly bent, and torsion occurs on both sides. Under the mode with a frequency of 2135 Hz, the left and right ends of the workbench are bent. Under the mode with a frequency of 3062 Hz, the front and rear ends of the workbench are bent. The three modal vibration shapes are comprehensively analyzed. Different marking frames are used on the two-dimensional plane diagram of the mold workbench to mark the positions with larger vibration amplitudes under the above three different modal vibration shapes, so as to determine the overlapping area of ​​the positions with larger amplitudes. LPBF particle dampers are mainly arranged in this area, as shown in the figure. Figure 5 As shown, in this embodiment, finite element analysis software is used to perform modal analysis, and an additive manufacturing model is established according to the arrangement of the particle damper, as shown in FIG. Figure 6 shown.

[0045] The model of the additive manufacturing modal workbench is established according to the distribution positions of the particle dampers, and the particle damper cavities are modeled at the determined distribution positions.

[0046] Laser powder bed fusion technology is used to additively manufacture the mold workbench, specifically:

[0047] First, a layer of powder is laid, and the powder in the area that needs to be solidified is melted by laser scanning according to the layered cross-sectional pattern of the model;

[0048] Then, the workpiece is lowered a layer, and the next layer of powder is laid. The laser melts and solidifies the powder. The powder laying and laser process are repeated until the additive manufacturing of the entire mold worktable is completed.

[0049] During this manufacturing process, the laser does not scan the solidified metal powder in the cavity area set in the model. Therefore, after the layer-by-layer processing is completed, multiple inner cavities are formed in the modal tool platen, each of which contains unmelted metal powder, realizing the integration of the particle damper inside the mold worktable.

[0050] The working principle is:

[0051] Under the intense structural vibration caused by the high-intensity stamping of the chip cutting and forming equipment, the unmelted granular powder inside the LPBF particle damper in the mold worktable rubs and collides with each other or with the inner cavity wall of the particle damper. During the collision and friction process, the vibration energy is consumed and converted into friction internal energy and collision kinetic energy, thereby enhancing the structural damping and giving the mold worktable a strong damping performance.

[0052] The vibration of the mold worktable caused by the high-intensity stamping of the chip cutting and forming equipment is weakened by the LPBF particle damper, thereby reducing vibration noise and weakening the further transmission of vibration, thereby achieving vibration and noise reduction of the chip cutting and forming equipment.

[0053] like Figure 1 As shown, this embodiment provides a chip cutting and forming equipment, including a processing waste bin 1, a mold work table 2, a lower stamping mold 3, a chip conveyor belt 4, a processed chip storage bin 5, a support column 6, an upper stamping mold 7, a stamping punch 8 and a motor drive module 9, and the mold work table has a built-in particle damper.

[0054] The present invention uses laser powder bed fusion technology (LPBF) to manufacture an integrated mold worktable, which is located in the chip cutting and forming equipment. Figure 1 As shown, laser powder bed fusion technology is used to additively manufacture the entire mold worktable. The processing process mainly involves laser melting metal powder layer by layer, laying a layer of powder, laser melting the powder in the corresponding area according to the model, and then laying the next layer of powder. The process is repeated until the processing is completed. During the process, powder that has not been laser melted is retained at a certain position according to the model. After the processing is completed, a granular powder cavity is formed, and a particle damper is integrated in the mold worktable.

[0055] The above embodiments are preferred implementation modes of the present invention, but the implementation modes of the present invention are not limited to the embodiments. Any other changes, modifications, substitutions, combinations, and simplifications that do not deviate from the spirit and principles of the present invention should be considered as equivalent replacement methods and are included in the scope of protection of the present invention.

Claims

1. A method for manufacturing a mold worktable, characterized in that: The steps include: The modal vibration model of the mold workbench is established through finite element modal analysis; According to the modal vibration model, the modal vibration shapes in the frequency range of 1000-3000 Hz are analyzed to determine the distribution location of the particle damper; A model of the additive manufacturing modal workbench is established based on the distribution positions of the particle dampers, and the particle damper cavities are modeled at the determined distribution positions. Apply laser powder bed fusion technology to additively manufacture mold worktables; The application of laser powder bed fusion technology to additively manufacture the mold worktable is specifically as follows: First, a layer of powder is laid, and the powder in the area that needs to be solidified is melted by laser scanning according to the layered cross-sectional pattern of the model; Then, the workpiece is lowered a layer, and the next layer of powder is laid. The laser melts and solidifies the powder. The process of laying powder and laser melting and solidifying powder is repeated until the additive manufacturing of the entire mold worktable is completed. During the additive manufacturing process, the laser does not scan the solidified metal powder in the cavity area set in the model. Therefore, after the layer-by-layer processing is completed, multiple cavities are formed in the modal tool platen, each of which contains unmelted metal powder, realizing the integration of the particle damper inside the mold worktable.

2. The method according to claim 1, characterized in that The arrangement of particle dampers includes linear distribution, circular distribution or staggered distribution.

3. A mold workbench manufactured by the method according to any one of claims 1-2, characterized in that: The mold workbench and the particle damper are manufactured in an integrated manner, and the particle damper is embedded in the interior of the mold workbench.

4. The mold worktable according to claim 3, characterized in that: The inner cavity of the particle damper is in the shape of a cube, and the particle filling rate is 80% to 95%.

5. The mold workbench according to claim 4, characterized in that: The cube is further divided into a plurality of cube cavities, which are used to reduce the excitation conditions of the particle damper and increase the number of effective collisions of particles to enhance energy loss.

6. The mold work table according to claim 4 or 5, characterized in that: The material model of the particles is 316L, and the particle diameter is at least 50 μm.

7. A chip cutting and forming device, characterized in that: The invention comprises the mold workbench plate described in any one of claims 3 to 6.

8. The chip cutting and forming equipment according to claim 7, characterized in that: Under the strong structural vibration caused by the high-intensity stamping of the chip cutting and forming equipment, the unmelted particles inside the particle damper rub and collide with each other or with the inner wall of the particle damper. The vibration energy is consumed in the process of collision and friction, and the vibration energy is converted into friction internal energy and collision kinetic energy, thereby enhancing structural damping.

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