Press and bake cart tool to improve PCB warpage

Abstract

The utility model discloses a kind of improve the press baking trolley tool of PCB warping, including the trolley body made of stainless steel material, the trolley body is provided with placing plate, for placing multiple stacked PCB board, the trolley body is used to carry and drive PCB board into baking equipment, the trolley body is provided with at least one pressure plate, the pressure plate is used to abut the top of stacked PCB board, the top of the pressure plate can place multiple levels of combinable weight, multiple levels of combinable weight are uniformly arranged, so that the pressure plate compacts stacked PCB board.

Description

Technical Field

[0001] This utility model relates to the field of circuit board manufacturing technology, and in particular to a pressure baking cart tool for improving PCB warpage. Background Technology

[0002] Baking is a crucial step in PCB (Printed Circuit Board) manufacturing. Baking removes moisture from the PCB, preventing quality issues such as delamination and board bursting during subsequent processing and use. However, PCB warping often occurs during baking. This warping is primarily caused by uneven stress distribution within the board and differences in thermal expansion coefficients. When the PCB enters the baking equipment, as the temperature rises, moisture evaporates, and the varying degrees of thermal expansion in different areas create stress concentration, leading to warping. Warped PCBs not only affect the accuracy of subsequent surface mount processes, causing poor component placement and cold solder joints, but also reduce product reliability and stability, increasing production costs and scrap rates.

[0003] In related technologies, the industry has adopted several measures to improve the warping problem during PCB baking. For example, pre-pressing the PCB board before baking is one method, but this requires additional equipment and operational steps, increasing the complexity and cost of the production process. Another method involves using simple weights to press on the PCB board during baking, but this method suffers from uneven weight distribution and unstable pressure, failing to effectively solve the PCB warping problem and potentially even damaging the PCB board. Utility Model Content

[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a pressure baking trolley tool to improve PCB warpage, which can uniformly apply stable pressure to stacked PCB boards during the PCB baking process, effectively improving PCB warpage and enhancing PCB production quality.

[0005] According to a first aspect of the present invention, a pressure baking trolley tool for improving PCB warpage includes a trolley body made of stainless steel. The trolley body is provided with a placement plate for placing multiple stacked PCBs. The trolley body is used to carry and move the PCBs into a baking device. The trolley body is provided with at least one pressure plate for abutting against the top of the stacked PCBs. The top of the pressure plate can hold multiple levels of combinable weights, which are evenly arranged to press the stacked PCBs tightly against the pressure plate.

[0006] The pressure baking trolley tool for improving PCB warpage according to embodiments of this utility model has at least the following beneficial effects: By setting a pressure plate and multi-level combinable weights on the trolley body, this utility model can apply uniform and stable pressure to stacked PCB boards during the PCB baking process, effectively suppressing warpage caused by uneven internal stress distribution and differences in thermal expansion coefficients, improving the flatness of the PCB boards, and ensuring the accuracy and product quality of subsequent processing steps. Furthermore, the multi-level combinable weight design allows operators to flexibly adjust the weight and quantity of weights according to the actual size, thickness, and quantity of PCB boards in production to meet different production needs. Simultaneously, the reasonable structural design of the trolley body facilitates the placement and removal of PCB boards, as well as the pushing and pulling of the trolley body into and out of the baking equipment, improving production efficiency. In addition, the trolley body is made of stainless steel, which has good corrosion resistance and high-temperature stability, allowing for long-term use in the high-temperature environment of the baking equipment without deformation or damage. The design of the pressure plate and multi-stage combinable weights ensures stable and uniform pressure transmission, preventing damage to the PCB board and improving the reliability and safety of the tool. Furthermore, compared to traditional methods for improving PCB warpage, this invention's pressure-baking trolley tool eliminates the need for additional complex equipment and operating procedures, reducing production costs. Simultaneously, by effectively reducing the PCB warpage scrap rate, it further improves production efficiency and lowers the overall cost for enterprises.

[0007] According to some embodiments of the present invention, the pressure plate is provided with a plurality of heat conduction holes, which are equidistant from each other and evenly arranged.

[0008] According to some embodiments of this utility model, the heat-conducting hole is a circular hole or a honeycomb hole.

[0009] According to some embodiments of the present invention, a push-pull handle is connected to one side of the placement plate, and the push-pull handle includes two symmetrically arranged vertical rods and a horizontal rod connecting the vertical rods.

[0010] According to some embodiments of this utility model, the vertical rod is slidably connected with a snap-fit ​​component, which is used to snap onto one side of the pressure plate. The pressure plate slides along the vertical rod through the snap-fit ​​component to abut against or move away from the PCB board.

[0011] According to some embodiments of this utility model, multiple vertical rods are provided along the length direction to engage multiple pressure plates, and the multiple pressure plates respectively abut against multiple stacked PCB boards arranged in the vertical direction.

[0012] According to some embodiments of this utility model, the multi-level combinable weight system includes multiple weights of different weights, which can be flexibly combined as needed.

[0013] According to some embodiments of the present invention, the bottom of the vehicle body is provided with four omnidirectional wheels, which are distributed at four corners. Each omnidirectional wheel is provided with a brake assembly, which can fix the omnidirectional wheel to prevent the vehicle body from moving.

[0014] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein: Figure 1 This is a schematic diagram of a pressure baking cart tool for improving PCB warpage according to an embodiment of the present invention.

[0016] Reference numerals: vehicle body 100; support plate 110; push-pull handle 120; vertical rod 121; horizontal rod 122; snap-fit ​​component 123; caster wheel 130; pressure plate 200; heat conduction hole 210; multi-stage combinable weight system 300. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0019] In the description of this utility model, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. If "first" or "second" is used in the description, it is only for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0020] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "installation," and "connection" should be interpreted broadly. Those skilled in the art can reasonably determine the specific meaning of these terms in this utility model based on the specific content of the technical solution. In the description of this utility model, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. In the description of this specification, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0021] Reference Figure 1 This utility model proposes a pressure baking trolley tool to improve PCB warpage, including a trolley body 100, which is made of stainless steel. The trolley body 100 is provided with a placement plate for placing multiple stacked PCB boards. The trolley body 100 is used to carry and move the PCB boards into the baking equipment. The trolley body 100 is provided with at least one pressure plate 200, which is used to abut against the top of the stacked PCB boards. The top of the pressure plate 200 can hold multiple levels of combinable weights, which are evenly arranged to make the pressure plate 200 press the stacked PCB boards tightly.

[0022] Specifically, the vehicle body 100 is made of stainless steel, which has excellent corrosion resistance and high-temperature stability, allowing it to be used for extended periods in the high-temperature environment of baking equipment without deformation or damage, ensuring the tool's lifespan and reliability. The placement plate on the vehicle body 100 has a planar structure, enabling the stable placement of multiple stacked PCB boards, providing a stable support platform for the PCB boards.

[0023] A pressure plate 200 is mounted on the vehicle body 100, and its position corresponds to the top of the stacked PCB boards on the mounting plate. The function of the pressure plate 200 is to withstand the pressure applied by the multi-level combinable weights and to evenly transfer the pressure to the stacked PCB boards, thereby effectively compressing the PCB boards.

[0024] Multi-level combinable weights are placed on top of the pressure plate 200, allowing for the selection and combination of weights of different weights and quantities according to actual needs. The even distribution of multi-level combinable weights on the pressure plate 200 ensures that the pressure is evenly distributed on the surface of the PCB board, avoiding damage or increased warping caused by excessive local stress on the PCB board due to uneven pressure.

[0025] In a specific embodiment, a stainless steel vehicle body 100 is fabricated. The dimensions of the vehicle body 100 are designed based on the commonly used PCB board sizes and baking equipment specifications in actual production. A placement plate is installed on the vehicle body 100. The surface of the placement plate is flat and smooth to ensure that the PCB boards are placed stably. A pressure plate 200 is installed on the vehicle body 100. The pressure plate 200 is parallel to the placement plate, and the distance between the pressure plate and the placement plate is sufficient to accommodate a certain number of stacked PCB boards. Multi-level combinable weights are prepared, with weight specifications including 1kg, 2kg, and 5kg, to be combined according to actual needs. Multiple PCB boards to be baked are neatly stacked on the placement plate of the vehicle body 100, ensuring that there are no obvious gaps or misalignments between the PCB boards. According to the size, thickness, and quantity of the PCB boards, as well as the requirements of the baking process, appropriate weights and quantities of weights are selected for combination. For example, for a batch of large and thick PCB boards, multiple 5kg weights can be selected for combination. The combined weights are evenly placed on top of the pressure plate 200, so that the pressure plate 200 is subjected to uniform pressure. The vehicle body 100, containing the PCB board and weights, is pushed into the baking equipment and baked according to the predetermined baking process parameters. During the baking process, the pressure plate 200, under the action of the weights, consistently applies stable pressure to the stacked PCB boards, effectively suppressing PCB board warping. After baking, the vehicle body 100 is pulled out of the baking equipment. Once the PCB boards have cooled to room temperature, the weights are removed, and the baked PCB boards are removed from the vehicle body 100 for subsequent processing steps.

[0026] In other embodiments, four casters 130 with brakes are installed at the bottom of the vehicle body 100 to facilitate movement and positioning of the vehicle body 100 within the production workshop. Simultaneously, multiple weight placement slots are provided on the pressure plate 200, evenly distributed across it, for more accurate weight placement and ensuring uniform weight distribution. The operation process is essentially the same as in the embodiments described above, except that the weights are accurately placed into the weight placement slots on the pressure plate 200 to further improve the uniformity of pressure distribution. When moving the vehicle body 100, the casters 130 allow for easy pushing or pulling into or out of the baking equipment, and when positioning is required, the brakes are engaged to fix the vehicle body 100 in the designated position.

[0027] Understandably, this utility model's pressure baking trolley tool, by setting a pressure plate 200 and multi-level combinable weights on the trolley body 100, can apply uniform and stable pressure to stacked PCB boards during the PCB baking process. This effectively suppresses warping problems caused by uneven internal stress distribution and differences in thermal expansion coefficients, improving the flatness of the PCB boards and ensuring the precision of subsequent processing steps and product quality. Furthermore, the multi-level combinable weight design allows operators to flexibly adjust the weight and quantity of weights according to the actual size, thickness, and quantity of PCB boards in production, meeting different production needs. Simultaneously, the reasonable structural design of the trolley body 100 facilitates the placement and removal of PCB boards, as well as the pushing and pulling of the trolley body 100 into the baking equipment, improving production efficiency. In addition, the trolley body 100 is made of stainless steel, possessing excellent corrosion resistance and high-temperature stability, allowing for long-term use in the high-temperature environment of the baking equipment without deformation or damage. The design of the pressure plate 200 and the multi-level combinable weights ensures the stability and uniformity of pressure transmission, preventing damage to the PCB board and improving the reliability and safety of the tool. Furthermore, compared to traditional methods for improving PCB warpage, this invention's pressure-baking trolley tool requires no additional complex equipment or operating procedures, reducing production costs. Simultaneously, by effectively reducing the PCB warpage scrap rate, it further improves production efficiency and lowers the overall cost for enterprises.

[0028] Furthermore, in manufacturing the carriage 100 of the pressure baking trolley tool for improving PCB warpage, the pressure plate 200 is processed. Using a drilling machine, multiple heat-conducting holes 210 are drilled on the pressure plate 200 according to a pre-designed equidistant and uniform layout. For example, if the pressure plate 200 is square with a side length of 50cm, the spacing between the heat-conducting holes 210 can be designed to be 5cm, evenly distributed across the entire surface of the pressure plate 200. After the PCB boards are stacked on the placement plate of the carriage 100, the pressure plate 200 with heat-conducting holes 210 is placed on top of the stacked PCB boards, and then multi-level combinable weights are placed on top. When the carriage 100 is pushed into the baking equipment for baking, the heat generated by the baking equipment can be transferred more quickly and evenly to the interior of the stacked PCB boards through these heat-conducting holes 210. The placement of the heat conduction holes 210 allows heat to be distributed more evenly in the PCB stack, avoiding uneven heating of different parts of the PCB due to local heat concentration or poor heat transfer, thereby further reducing warping caused by uneven thermal stress and improving the baking quality of the PCB.

[0029] Optionally, the heat-conducting hole 210 can be a circular hole or a honeycomb hole. The circular heat-conducting hole 210 has a mature manufacturing process, low cost, and relatively low resistance during heat transfer, ensuring smooth heat transfer within the PCB stack and improving baking uniformity and efficiency. The honeycomb hole's unique structure provides a larger heat exchange area, significantly improving heat transfer efficiency, resulting in more uniform heating of the PCB and further reducing the risk of warping. Its unique structure also increases the strength and stability of the pressure plate 200.

[0030] Reference Figure 1 Furthermore, two symmetrically arranged vertical rods 121 are welded or bolted to one side of the placement plate. The length of the vertical rods 121 is determined according to actual usage requirements. Then, a suitable connector is used to connect a horizontal rod 122 between the two vertical rods 121, forming a push-pull handle 120. The push-pull handle 120 can be made of the same stainless steel as the vehicle body 100 to ensure its strength and corrosion resistance. When the vehicle body 100 needs to be pushed into or pulled out of the baking equipment, the operator holds the horizontal rod 122 and can easily move the vehicle body 100 by applying pushing or pulling force. The design of the push-pull handle 120 makes it easier and more convenient for the operator to move the vehicle body 100, especially when pushing or pulling the vehicle body 100 into or out of the baking equipment, without directly contacting other parts of the vehicle body 100, avoiding safety hazards such as burns, and improving the efficiency and comfort of operation.

[0031] Furthermore, a sliding groove is provided on the vertical rod 121, and the locking member 123 is slidably connected to the sliding groove via a slider. One end of the locking member 123 is designed with a slot that matches one side of the pressure plate 200. When the pressure plate 200 needs to be placed on top of the stacked PCB boards, the pressure plate 200 is first placed in a suitable position, and then the locking member 123 is slid so that the slot of the locking member 123 locks one side of the pressure plate 200, thereby fixing the position of the pressure plate 200. When it is necessary to adjust the distance between the pressure plate 200 and the PCB board, simply slide the locking member 123 to raise or lower the pressure plate 200 to abut or move away from the PCB board. For example, when initially placing the PCB board, the pressure plate 200 is raised, and after the PCB boards are stacked, the locking member 123 is slid to lower the pressure plate 200 to press it onto the PCB board. Through the sliding connection between the snap-fit ​​123 and the vertical rod 121, the operator can easily adjust the position of the pressure plate 200 without the need for additional tools. The pressure plate 200 can be placed in the appropriate position quickly and accurately to meet the pressure baking requirements of PCB boards of different sizes and thicknesses.

[0032] In some embodiments, each vertical rod 121 is provided with multiple snap-fit ​​members 123 along its length. Depending on the height and position of the multiple stacked PCB boards to be pressed, multiple pressure plates 200 are slidably connected to the vertical rod 121 via the snap-fit ​​members 123. Specifically, for a first stack of PCB boards with a lower height, the first pressure plate 200 is fixed at a lower position using the snap-fit ​​members 123 and pressed onto the PCB board; for a second stack of PCB boards with a higher height, the second pressure plate 200 is fixed at a higher position using the snap-fit ​​members 123 and pressed onto the PCB board. Multi-level combinable weights of corresponding weights are placed on top of each pressure plate 200 to achieve simultaneous pressing of multiple PCB boards.

[0033] It should be noted that the multi-level combinable weight system 300 includes multiple weights of different weights, such as several weights weighing 0.5kg, 1kg, 2kg, and 5kg. Operators can flexibly select and combine weights of different weights according to the size, thickness, quantity, and baking process requirements of the PCB boards. For example, for a batch of smaller, thinner PCB boards, a combination of two 0.5kg and one 1kg weight can be selected; for larger, thicker PCB boards, a combination of two 5kg weights can be selected. The assembled weights are evenly placed on top of the pressure plate 200 to apply appropriate pressure to the stacked PCB boards. The multi-level combinable weight system 300 can be flexibly adjusted according to different production needs, and is suitable for the pressure baking process of PCB boards of various sizes, thicknesses, and quantities, improving the versatility and adaptability of the tool.

[0034] Four casters 130 are installed at the four corners of the bottom of the vehicle body 100, and the casters 130 are fixedly connected to the vehicle body 100 with bolts. Each caster 130 is equipped with a braking assembly, which generally includes a brake pedal and brake pads. When the vehicle body 100 needs to be moved, the operator can easily push or pull the vehicle body 100, and the casters 130 can rotate freely, enabling the vehicle body 100 to move flexibly. When the vehicle body 100 reaches a designated position, such as before being pushed into the baking equipment or when the vehicle body 100 needs to be fixed, the brake pedal is pressed with the foot. The brake pads will make close contact with the casters 130, generating friction, thereby fixing the casters 130 and preventing the vehicle body 100 from moving. The four casters 130 distributed at the four corners allow the vehicle body 100 to move freely and flexibly within the production workshop, making it convenient for operators to quickly and accurately push or pull the vehicle body 100 into or out of the baking equipment, as well as transfer it between different work areas, improving the smoothness and efficiency of production.

[0035] The embodiments of the present utility model have been described in detail above with reference to the accompanying drawings. However, the present utility model is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present utility model.

Claims

1. A pressure baking cart tool for improving PCB warpage, characterized in that, include: The vehicle body is made of stainless steel and is equipped with a placement plate for placing multiple stacked PCB boards. The vehicle body is used to carry and move the PCB boards into the baking equipment. The vehicle body is equipped with at least one pressure plate for abutting the top of the stacked PCB boards. The top of the pressure plate can hold multiple levels of combinable weights, which are evenly distributed to make the pressure plate press the stacked PCB boards tightly.

2. The pressure baking cart tool for improving PCB warpage according to claim 1, characterized in that, The pressure plate is provided with multiple heat conduction holes, which are equidistant from each other and evenly arranged.

3. The pressure baking cart tool for improving PCB warpage according to claim 2, characterized in that, The heat-conducting holes are circular holes or honeycomb-shaped holes.

4. The pressure baking cart tool for improving PCB warpage according to claim 1, characterized in that, A push-pull handle is connected to one side of the placement plate. The push-pull handle includes two symmetrically arranged vertical rods and a horizontal rod connecting the vertical rods.

5. The pressure baking cart tool for improving PCB warpage according to claim 4, characterized in that, The vertical rod is slidably connected to a snap-fit ​​component, which is used to snap onto one side of the pressure plate. The pressure plate slides along the vertical rod via the snap-fit ​​component to abut against or move away from the PCB board.

6. The pressure baking cart tool for improving PCB warpage according to claim 5, characterized in that, The vertical rods are provided in multiple ways along their length to engage multiple pressure plates, and the multiple pressure plates respectively abut against multiple stacked PCB boards arranged in the vertical direction.

7. The pressure baking cart tool for improving PCB warpage according to claim 1, characterized in that, The multi-level combinable weight system includes multiple weights of different weights, which can be flexibly combined as needed.

8. The pressure baking cart tool for improving PCB warpage according to claim 1, characterized in that, The bottom of the vehicle body is equipped with four casters, which are distributed at the four corners. Each caster is equipped with a brake assembly, which can fix the casters to prevent the vehicle body from moving.

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