Ceramic substrate dicing tool

Abstract

The application discloses a ceramic substrate splitting tool, wherein a fixing shaft and a rotating shaft are both fixed on a tool base, the fixing shaft is provided with a boss, the rotating shaft is provided with a groove matched with the boss, and the fixing shaft and the rotating shaft are embedded together through the boss and the groove; when the boss groove of the fixing shaft and the boss groove of the rotating shaft are overlapped and aligned, a person-shaped gap is formed. A cylindrical contact device is additionally arranged on the top of the air rod of a force cylinder, and the contact device and the rotating shaft are in soft contact; one end of a booster spring is fixed on the rotating shaft, and the other end is fixed on a spring base, and the spring base is fixed on the base. The application can effectively reduce the phenomenon of more or less ceramic after splitting, ensure the size integrity of the substrate, and prevent the damage to the front and back surface mounted devices during the splitting process, and the circuit performance is not affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of ceramic substrate, in particular to a ceramic substrate slicing device. BACKGROUND

[0002] The CA series integrated circuit is widely used in front-end thermal control processing systems of new energy vehicles and traditional vehicles. With the continuous expansion of the market size of new energy vehicles, the market demand for vehicle commercial core chip control circuits is huge and shows an explosive growth trend.

[0003] In the current technology, the slicing process of thick film circuits has low aging, and there are many ceramic slicing and ceramic missing phenomena, which affect the appearance and performance of the product.

[0004] In the production process, the thickness of the series product is 2mm thick ceramic substrate, the whole size area is large (continuous piece size: 112.2*96.8mm; single piece product size: 14.15*12.4*2mm), the number of continuous pieces is large (42 continuous pieces), and the depth of the scratch line is 1mm. It is not easy to slice in the production process, and the ceramic slicing and ceramic missing phenomenon is more serious after slicing. And in the slicing process, the positive and negative surface mounted devices are easily damaged, thereby affecting the circuit performance. SUMMARY

[0005] The present application provides a ceramic substrate slicing tool, which reduces the ceramic slicing and ceramic missing phenomenon of the product after slicing, ensures the size integrity of the substrate, and does not easily damage the positive and negative surface mounted devices during slicing, without affecting the circuit performance.

[0006] The technical scheme of the present application is a ceramic substrate slicing tool, characterized in that it comprises a fixed shaft and a rotating shaft, both of which are fixed on a tool base, the fixed shaft is provided with a boss, the rotating shaft is provided with a groove matched with the boss, and the fixed shaft and the rotating shaft are embedded together by the boss and the groove; a fixed shaft groove is provided on the fixed shaft, and a rotating shaft groove is provided on the rotating shaft; when the fixed shaft groove and the rotating shaft groove are embedded, a person-shaped gap is formed.

[0007] Further, a force applying cylinder, a booster spring and a foolproof photoelectric switch are also fixed on the tool base; a cylindrical contact device is installed on the top of the gas rod of the force applying cylinder for soft contact between the rotating shaft; one end of the booster spring is fixed on the rotating shaft, and the other end is fixed on a spring base; the foolproof photoelectric switch is fixed on the rotating shaft through a foolproof photoelectric switch fixing seat.

[0008] Further, the fixed shaft groove and the rotating shaft groove are the same size and the position direction is mirror image.

[0009] Further, the fixed shaft groove is larger in size than the rotating shaft groove, and the position direction is mirror image.

[0010] Further, the rebound auxiliary force direction of the assisting spring is 45 degrees with the pushing force direction of the air rod.

[0011] The present application has the following advantages:

[0012] 1. The present application uses corresponding grooves on the fixed shaft and the rotating shaft to ensure that the device does not touch the slicing tool during slicing.

[0013] 2. The front end of the air rod and the rotating shaft are in soft contact, which ensures that the force of the air cylinder through the air rod is stable regardless of the position of the rotating shaft, ensuring the integrity of the substrate during slicing.

[0014] 3. The assisting spring of the present application uses a spring with a size of about 5N to assist the rotating shaft to return to its original position, and the position direction is 45 degrees with the pushing direction of the air rod, which ensures the stability of the rotating shaft.

[0015] 4. Through technical innovation and process improvement, the present application is committed to solving the slicing process of 2mm thick ceramic substrates, optimizing and perfecting the product process technology, realizing large-scale production, and meeting the performance and appearance requirements of the product. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 is a schematic diagram of a whole product;

[0017] Figure 2 is a schematic diagram of a slicing product

[0018] Figure 3 is a schematic diagram of a solder pad front;

[0019] Figure 4 is a schematic diagram of a solder pad back;

[0020] Figure 5 is a schematic diagram of a slicing tool;

[0021] Figure 6 is a schematic diagram of slicing operation;

[0022] Figure 7 is a schematic diagram of a slicing tool;

[0023] Figure 8 is a schematic diagram of a slicing rotating combination;

[0024] Figure 9 is a schematic diagram of slicing tool operation;

[0025] Figure 10 is a schematic diagram of a fixed shaft;

[0026] Figure 11 is a schematic diagram of a rotating shaft;

[0027] Figure 12 is a rotating shaft groove schematic diagram;

[0028] Figure 13 is a fixed shaft groove schematic diagram;

[0029] Figure 14 is a power spring force direction schematic diagram;

[0030] Figure legend: 1 - tool base, 2 - force cylinder, 3 - rotating shaft, 4 - fixed shaft, 5 - rotating shaft groove, 6 - fixed shaft groove, 7 - power spring, 8 - spring base, 9 - foolproof photoelectric switch, 10 - foolproof photoelectric switch fixing seat, 11 - cylindrical contact device. DETAILED DESCRIPTION

[0031] As Figure 1 , Figure 2 , Figure 3 , Figure 4 indicated, the product front and back surface exists surface mount device, and part of the device thickness is greater than the substrate thickness, so in the slicing process, the device of the protruding part is easy to be damaged, and because of the physical properties of ceramic material, the edge of the product substrate after slicing will exist the phenomenon of protrusion or depression, that is, the phenomenon of more ceramic and less ceramic, the appearance of this phenomenon will affect the adaptability and safety of the product itself, and there is a certain electrical performance hidden danger in the product.

[0032] The present application mainly utilizes the bending principle to design the tool, and the cylinder is powered to assist the operation in the slicing process. The primary goal of the design is to protect the integrity of the product substrate and the device, so corresponding grooves are made according to the distribution of the product device in the early stage of design to ensure that the device will not touch the slicing tool during slicing. Secondly, the design is made for the phenomenon of more ceramic and less ceramic on the edge of the product. Through the stress analysis model demonstration, it is found that the phenomenon of more ceramic and less ceramic caused by uneven stress is more obvious, so the stress on the product during slicing on the tool is as uniform as possible.

[0033] The present application mainly consists of tool base 1, folding strip rotating combination and slicing rotating combination three parts; the folding strip rotating combination and the slicing rotating combination are fixed on the base.

[0034] The tool base 1 is made of square steel, mainly to improve the stability in the slicing process and reduce the shaking of the product during slicing.

[0035] As Figure 5As shown, the folding and rotating assembly is made of polyester fiber and can provide a certain amount of external force to fix the product, protecting the integrity of the substrate and preventing damage to the device. It consists of two parts: a fixed shaft 4 and a fixed shaft groove 6, and a rotating shaft 3 and a rotating shaft groove 5. The fixed shaft has a boss, and the rotating shaft has a groove that matches the boss. The fixed shaft and the rotating shaft rotate together by engaging the boss and the groove. The fixed shaft groove 6 and the rotating shaft groove 5 are the same size and are mirror images of each other. Figure 10 , Figure 11 , Figure 12 , Figure 13 As shown, when the fixed shaft groove 5 and the rotating shaft groove 6 are aligned, there is a herringbone-shaped notch.

[0036] like Figure 7 , Figure 8 As shown, the segmented rotating assembly consists of five parts: a force-applying cylinder 2, a booster spring 7, a spring base 8, a foolproof photoelectric switch 9, a fixed shaft 4 and a fixed shaft groove 5, and a rotating shaft 3 and a rotating shaft groove 6, all made of polyester fiber. In addition to the main body, the auxiliary device includes an auxiliary air source, and the overall assembly constitutes a complete segmented tooling.

[0037] The foolproof photoelectric switch 9 is fixed on the rotating shaft 3 by the foolproof photoelectric switch mounting base 10.

[0038] One end of the assist spring 7 is fixed on the rotating shaft 3, and the other end is fixed on the spring base 8. The spring base 8 is fixed on the tooling base 1.

[0039] The fixed shaft groove 5 is larger than the rotating shaft groove 6, and their positions are mirror images of each other.

[0040] The auxiliary air source uses a 2MPa air source, which is used uniformly on the production line. During the slicing process, it can meet the time and force required for product bending, and there is no need to provide an additional dedicated air source, which is convenient for production line layout and daily inspection and maintenance.

[0041] Air source and pneumatic rod assembly: The pneumatic rod has a stroke length of 14mm, which meets the movement distance of the rotating shaft, increasing the range of rotation of the rotating shaft and achieving better slicing effect. A cylindrical contact device 11 with a thickness of 12mm and a diameter of 18mm is added to the top of the pneumatic rod to ensure stable contact between the rotating shaft 3 and the pneumatic rod, facilitating stable force application. The front end of the pneumatic rod has a soft contact with the rotating shaft because the pneumatic rod moves linearly while the rotating shaft moves in a curved path. The advantage of soft contact is that regardless of the change in the position of the rotating shaft, the force applied by the cylinder through the pneumatic rod remains stable, ensuring the integrity of the substrate during the slicing process.

[0042] Assist spring 7: A spring with a strength of approximately 5N is used to assist in the return of the rotating shaft 3. The direction of its rebound assist force forms a 45° angle with the direction of the gas rod's pushing force.Figure 14 As shown, this ensures the springback stability of the rotating shaft.

[0043] The foolproof photoelectric switch 9 uses a limit alarm, limiting the slit size based on the individual piece dimensions, combined with infrared foolproofing and cylinder linkage. When the slit product is not fully inserted into the groove, the foolproof photoelectric switch is activated, and the cylinder control switch is pressed, but the cylinder does not move. When the slit product is fully inserted into the groove, the foolproof photoelectric switch is not activated, and the cylinder control switch is pressed, causing the cylinder to operate normally for the slitting operation.

[0044] Due to the different length and width dimensions of the products, in order to ensure the neatness of the edges of the segmented products, a separate slitting and slicing process is designed. That is, the whole product is first slitted according to the design direction (with the blank substrate end as the insertion groove direction). The slitted products are then divided into smaller pieces with the pad end as the insertion groove direction, thus obtaining the final product.

[0045] The most important thing in the slitting and slicing process is to reduce the phenomenon of too much or too little ceramic in the slicing products and ensure the dimensional integrity of the substrate.

[0046] like Figure 6 As shown, the slitting process is as follows: With the direction of the solder pad as the bottom insertion direction and the side containing the blank substrate as the top, first remove the process edges on the bottom, left, and right sides, retaining the top process edge (i.e., the blank substrate portion). Insert the blank substrate into the grooves of the fixed and rotating shafts, aligning the substrate's scratch line with the bending point of the fixture. Utilizing the bending principle, manually push the rotating shaft of the fixture to obtain a strip-shaped product. It is important to note that when inserting the blank substrate into the groove, it should not be inserted from top to bottom. To protect the surface mount components of the product, it should be inserted horizontally from left to right or right to left. After rotation and bending, the product must be kept stable to avoid large-scale shaking. This greatly reduces the occurrence of missing or insufficient ceramic at both ends of the resulting strip.

[0047] During the slitting process, because the rotation point of the tooling bends directly acts on the blank substrate, the force dissipates at the blank substrate during the slitting rotation. The remaining parts are directly decomposed during force transmission due to the presence of the scratch lines, without damaging the substrate or components. In this way, phenomena such as missing ceramic or chipped edges during slitting are concentrated on the blank substrate, which helps protect the integrity of the product and the good condition of the components.

[0048] like Figure 9As shown, the slicing process is as follows: Insert the sliced ​​product into the grooves of the fixed shaft and the rotating shaft with the direction of the solder pad as the bottom insertion direction. Ensure that one end of the product is against the fixture limit point, aligning the substrate scratch line with the fixture bend. Confirm that the foolproof photoelectric switch has no alarm, then step on the cylinder control switch. The force cylinder pushes the rotating shaft downwards to bend, thus obtaining the final product. When the rotating shaft moves downwards, the assist spring provides an upward thrust, helping the rotating shaft to spring back to the same horizontal position as the fixed shaft.

[0049] The rotation angle when the rotating shaft is bent is crucial. If the rotation angle is too small, the kinetic energy generated when the product splits cannot be dissipated in time, resulting in more obvious ceramic chipping. If the rotation angle is too large, the kinetic energy will be distributed at the edge of the substrate, causing severe ceramic chipping. Therefore, the rotation angle of the rotating shaft is set within the range of 5°±1° according to the product thickness.

Claims

1. A ceramic substrate slicing fixture, characterized in that, Includes a fixed shaft (4) and a rotating shaft (3). Both the fixed shaft (4) and the rotating shaft (3) are fixed on the tooling base (1). The fixed shaft (4) is provided with a boss, and the rotating shaft (3) is provided with a groove that is compatible with the boss. The fixed shaft (4) and the rotating shaft (3) are fitted together by the boss and the groove. A fixed shaft groove (6) is provided on the fixed shaft, and a rotating shaft groove (5) is provided on the rotating shaft. When the fixed shaft groove (6) and the rotating shaft groove (5) are fitted together, there is a herringbone notch. In order to ensure that the edges of the sliced ​​products are neat, the whole plate of products is first slit with the blank substrate end as the insertion direction of the groove. The slit products are then divided into smaller pieces with the pad end as the insertion direction of the groove, thus obtaining the final product. Slitting process: With the direction of the solder pad as the bottom insertion direction and the side of the blank substrate as the top, first remove the process edges of the bottom, left and right sides, keeping the blank substrate part. Insert the blank substrate into the groove of the fixed shaft and the rotating shaft, align the substrate scratch line with the bending part of the tooling, and use the bending principle to push the rotating shaft of the tooling to obtain the strip product. The rotation angle of the rotating shaft is within the range of 5°±1°; During the slitting process, since the rotation point of the tooling bend directly acts on the blank substrate, the force dissipates at the blank substrate during the slitting rotation. The remaining parts are directly decomposed during the force transmission process due to the presence of the scratch lines, without damaging the substrate and devices.

2. The ceramic substrate slicing fixture as described in claim 1, characterized in that, A force-applying cylinder (2), an assisting spring (7), and a foolproof photoelectric switch (9) are also fixed on the tooling base (1); a cylindrical contact device (11) is installed on the top of the rod of the force-applying cylinder (2) to make soft contact with the rotating shaft (3); one end of the assisting spring (7) is fixed on the rotating shaft (3), and the other end is fixed on the spring base (8); the foolproof photoelectric switch (9) is fixed on the rotating shaft (3) through the foolproof photoelectric switch fixing seat (10).

3. The ceramic substrate slicing fixture as described in claim 1, characterized in that, The fixed shaft groove (6) and the rotating shaft groove (5) are the same size and are mirror images of each other.

4. The ceramic substrate slicing fixture as described in claim 2, characterized in that, The size of the fixed shaft groove (6) is larger than the size of the rotating shaft groove (5), and the position direction is mirror image.

5. The ceramic substrate slicing fixture as described in claim 4, characterized in that, The direction of the rebound assist force of the assist spring (7) forms a 45° angle with the direction of the push force of the air rod.

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