Novel jig for chip resistor grinding process
By designing a new chip resistance grinding fixture including a reference platform, upper cover and lower cover, the product crack problem caused by large linear speed differences in traditional fixtures is solved, and the flexibility and scope of fixtures are improved through multiple cavity combination designs, achieving higher product quality and lower maintenance costs.
Patent Information
- Application Number
- CN202421882173.6
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-05
- Publication Date
- 2025-05-16
- Estimated Expiration
- 2034-08-05
AI Technical Summary
Traditional chip resistance grinding fixtures have large differences in linear speed due to integrated structure, resulting in product cracks, and a large number of fixtures of different specifications are required, which increases resource and maintenance costs.
A new type of fixture is designed, including a reference platform, an upper cover and a lower cover. The upper cover and a lower cover are fixed to the reference platform through a fixing device. The cavity is arranged outside the center of the upper cover and the lower cover to achieve a more uniform linear velocity distribution, and the flexibility and scope of use of the fixture are improved through the design of multiple cavity combinations.
It effectively solves the product crack problem caused by the difference in linear speed in traditional fixtures, reduces the number and maintenance costs of fixtures, and improves product quality, yield and reliability.
Smart Images
Figure CN222874207U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of chip resistor grinding, in particular to a new type of jig used in a chip resistor grinding process. Background Art
[0002] In the production process of chip thick film resistors, when the front and back conductors are connected by metallization paste filling process, the metal in the hole is not very flat in the overlap area between the front and back metals, which can easily lead to product performance and quality defects and affect the product qualification rate. It is necessary to use a grinding process to grind off the conductors that are higher than the printed layer. A grinding jig is required in the grinding process. Traditional grinding jigs are usually integrated metal discs with a cavity in the center of the disc.
[0003] In the prior art, the linear speed of the chip resistors fixed in the center is too different during the grinding process. According to the linear speed formula V=ωR, the linear speed at the center (center of the circle) is 0, while the value at the edge is very large, resulting in a considerable proportion of cracks in the chip resistors after grinding, which has caused great trouble to the subsequent process arrangement: the integrated single cavity structure leads to low utilization rate of a single model of jig; at the same time, more models of jigs need to be reserved for chip resistors of different sizes and thicknesses, occupying more resources and storage space; the bottom of the cavity is prone to wear and tear after long-term use, and even an indefinite number of pits are generated. Such integrated structure jigs need to be trimmed or scrapped as a whole, and the process is complicated. To this end, we propose a new jig for chip resistor grinding process to solve the above problems. Utility Model Content
[0004] The purpose of the utility model is to provide a new type of jig for chip resistor grinding process to solve the problems raised in the above background technology.
[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a new type of jig for chip resistor grinding process, comprising a reference platform, an upper cover and a lower cover, the upper cover and the lower cover are provided with a cavity, a fixing device is provided between the reference platform and the upper cover, and between the reference platform and the lower cover, the fixing device is used to fix the upper cover and the lower cover on the reference platform, the fixing device comprises a hook provided on the upper cover and the lower cover, the hook is movably inserted into a groove, a pin for limiting the hook and separating from the hook is movably inserted into the groove, and the pin is provided with a spring for pushing the pin to move into the groove.
[0006] Preferably, the cavities of the upper cover and the lower cover are arranged outside the center of the upper cover and the lower cover.
[0007] Preferably, the cavities of the upper cover and the lower cover are divided into independent single-type models or nested double-type models.
[0008] Preferably, the hook is an L-shaped structure, the length of the hook is less than or equal to the height of the groove, and one end of the hook is connected to the upper cover and the lower cover on one side facing the reference platform.
[0009] Preferably, the size of the groove is larger than that of the hook, the groove is opened on the reference platform, the groove consists of two parts, one part is a rectangular structure, and the other part is a cylindrical structure, one end of the cylindrical part of the groove penetrates to the side wall of the reference platform.
[0010] Preferably, the length of the latch is less than or equal to the length of the groove, the latch is covered with a protective sleeve, the diameter of the latch is less than the height of the upper half of the hook, and the top of the latch is below the top of the groove.
[0011] Preferably, the spring is a compression spring, one end of the spring is arranged on the latch, and the other end of the spring is arranged on the cylindrical part of the groove.
[0012] Compared with the prior art, the beneficial effects of the utility model are:
[0013] 1. Effectively solve the problem of large difference in grinding line speed in different grinding areas during the traditional chip resistor grinding process, which leads to product cracks, low product yield, poor product reliability and other quality problems; at the same time, it can effectively solve the problem that different models of products need to produce a large number of different specifications of jigs due to different specifications, and the maintenance cost is high. In addition, the same jig can be flexibly used for the grinding of a variety of different specifications and models of products, reducing the number of jigs and maintenance costs, and effectively improving product quality, yield and reliability.
[0014] 2. Pull the latch, the latch moves to compress the spring, and the latch is separated from the rectangular part of the groove, then move the upper cover and the lower cover so that the upper cover and the lower cover move to fit the reference platform. When the upper cover and the lower cover move, the hook follows the upper cover and the lower cover to move and insert into the groove, then release the latch, the latch moves to insert into the rectangular part of the groove, and passes through the inner corner of the hook, thereby limiting the movement of the hook and separating from the groove, completing the connection between the upper cover, the lower cover and the reference platform, making it easy to fix the upper cover and the lower cover on the reference platform, thereby improving the installation efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0015] Figure 1 This is a schematic diagram of a single-sided structure (including only the upper cover) in the utility model;
[0016] Figure 2 For this utility model Figure 1 A magnified view of the structure at center;
[0017] Figure 3 It is a schematic diagram of the double-sided structure (including an upper cover and a lower cover) in the utility model;
[0018] Figure 4 This is a schematic diagram of the structure of the three distributed single-model independent cavity in the utility model;
[0019] Figure 5 It is a schematic diagram of the structure of the three-distributed double-model nested cavity in the utility model.
[0020] In the figure: 1. reference platform; 2. upper cover; 3. fixing device; 31. hook; 32. groove; 33. latch; 34. spring; 4. lower cover. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0022] See also Figure 1-5 , a new type of jig for chip resistor grinding process, including a reference platform 1 and an upper cover 2. According to the use requirements, a lower cover 4 can be added. It is designed as a double-sided structure. For the convenience of discussion, the following is a double-sided structure. The upper cover 2, the lower cover 4 and the middle layer of the reference platform 1 have a selective combined design, which reduces the frequency of frequent replacement of the upper cover 2 and the lower cover 4 and effectively saves man-hours. The upper cover 2 and the lower cover 4 can belong to chip resistors of different sizes, or chip resistors of different thicknesses, or chip resistors of different sizes and thicknesses. The upper cover 2 and the lower cover 4 can be of various structures and do not have to be consistent. The factory can fix the frequently used specifications together and bundle them together according to the grinding requirements of the product, and the commonly used specifications can be recycled, which greatly reduces the number of times the upper cover 2 and the lower cover 4 are replaced; at the same time, the fixing device 3 connecting the upper cover 2, the lower cover 4 and the reference platform 1 also plays a good protective role, and the deadline for its loosening and failure is greatly delayed.
[0023] Furthermore, a layer of flannel cloth can be set on the end surface of the reference platform 1 between the reference platform 1 and the upper cover 2, and between the reference platform 1 and the lower cover 4 for buffering, so that some brittle chip resistors are not directly fixed and adhered to the surface of the contact jig, but are directly fixed and adhered to the flannel cloth. When the chip resistor is ground, the flannel cloth has a buffering effect, which greatly reduces the risk of cracks in the chip resistor during the grinding process.
[0024] Both the upper cover 2 and the lower cover 4 are provided with cavities, and the cavities of the upper cover 2 and the lower cover 4 are respectively arranged outside the center of the circle of the upper cover 2 and the lower cover 4 (eccentric cavity), so that the linear speed of the fixed chip resistor distributed in various places is relatively balanced, the difference will not be very large, and there will be no position where the linear speed is 0.
[0025] It can be selected according to usage requirements and is divided into a single-sided structure (1 upper cover 2 and 1 reference platform 1), and a double-sided structure (1 upper cover 2, 1 lower cover 4 and 1 reference platform 1); the three-distributed cavity is that the upper cover 2 contains 3 cavities distributed in an annular manner. When the ceramic piece is too small or too large, it can also be processed into a form containing 2 or 4 cavities with annular symmetry.
[0026] The double-model nested cavity of the upper cover 2 and the lower cover 4 can hold and fix any one of the double-model ceramic pieces. When the nested cavity is in a circular distribution (2-4 cavities on each side), at least two sizes of ceramic pieces can be ground simultaneously each time.
[0027] The cavities of the upper cover 2 and the lower cover 4 can be designed in different combinations according to usage requirements: single-sided and double-sided layouts (containing only the upper cover 2, or containing both the upper cover 2 and the lower cover 4) and three annular distributed cavity designs (2 cavities, 3 cavities, and 4 cavities), as well as two single cavity capacity designs (single-model independent cavity, double-model nested cavity). In total, at least 2X 3X2=12 major categories of jigs for grinding chip resistors can be designed; in addition, the reference platform 1 can be mixed and matched according to the upper cover 2 or the lower cover 4 of different thicknesses and sizes to form a 2+1 sandwich structure.
[0028] Different upper covers 2 and lower covers 4 can be made according to the size and thickness specifications of the ceramic sheet. The processing is economical, the volume is small, and it is convenient for storage and stacking management. As for the reference platform 1, it is a universal specification and is suitable for chip resistors of all sizes and thicknesses. Therefore, only 2-3 spare ones are needed. When the reference platform 1 is worn, only the reference platform 1 needs to be fine-milled and ground to avoid the situation where the old integrated fixture, when the bottom of the central cavity is worn, needs to simultaneously fine-mill the surface of the fixture and the bottom of the cavity, because the thickness must be kept consistent with the chip resistor to be ground.
[0029] like Figure 4 As shown in the figure, the size specifications of commonly used chip resistors are sufficient to make multiple cavities on the reference platform 1 for simultaneous grinding. According to the test results, it is generally appropriate to make three cavities on the reference platform 1 (in the case where the ceramic sheet is too small or too large, two or four cavities with annular symmetry can also be made). Figure 4plus the double-layer optimized structure of the upper cover 2 and the lower cover 4, there are a total of 6 cavities (taking the case of 3 cavities with circular symmetry on one side as an example), which can be recycled.
[0030] like Figure 5 As shown in the figure, the size specifications of the two types of chip resistors are not much different. When the above requirements are met, the cavity can be designed as follows: Figure 5 Structure: The two types of cavities cross each other, and when the double-layer optimized structure contains the upper cover 2 and the lower cover 4, there are 6+6=12 cavities available for recycling (taking the case of 3 double-type nested cavities with circular symmetry on one side as an example). In this way, the use range of the upper cover 2 and the lower cover 4 is greatly improved (a single upper cover 2 or lower cover 4 can use two sizes of ceramic pieces to be ground), and the number of times the upper cover 2 and the lower cover 4 are replaced is also effectively reduced, saving working hours. During grinding, each side can grind 3 smaller ceramic pieces at the same time, or grind 3 larger ceramic pieces at the same time, or grind 2 small and 1 large ceramic pieces at the same time, or grind 2 large and 1 small ceramic pieces at the same time, which facilitates production planning and flexibly promotes production activities.
[0031] It effectively solves the problem of large difference in grinding line speed in different grinding areas during the grinding process of traditional chip resistors, which leads to product cracks, low product yield, poor product reliability and other quality problems; at the same time, it can effectively solve the problem of different models of products needing to produce a large number of different specifications of jigs due to different specifications, and high maintenance costs. The same jig can be flexibly used for grinding a variety of products of different specifications and models, reducing the number of jigs and maintenance costs, and effectively improving product quality, yield and reliability.
[0032] A fixing device 3 is provided between the reference platform 1, the upper cover 2 and the lower cover 4. The fixing device 3 is used to fix the upper cover 2 and the lower cover 4 on the reference platform 1 respectively. The fixing device 3 is provided with multiple groups. The fixing device 3 includes a hook 31 provided on the upper cover 2 and the lower cover 4. The hook 31 is inserted into the groove 32. A latch 33 is inserted into the groove 32 to limit the hook 31 and separate from the hook 31. The latch 33 is provided with a spring 34 for pushing the latch 33 to move and insert into the groove 32. The hook 31 is an L-shaped structure. The length of the hook 31 is less than or equal to the height of the groove 32. One end of the hook 31 is connected to the upper cover 2 and the lower cover 4 toward the reference platform 1. On the side, the size of the groove 32 is larger than the size of the hook 31. The groove 32 is opened on the reference platform 1. The groove 32 consists of two parts, one part is a rectangular structure, and the other part is a cylindrical structure. One end of the cylindrical part of the groove 32 penetrates to the side wall of the reference platform 1. The length of the pin 33 is less than or equal to the length of the groove 32. The outside of the pin 33 is covered with a protective sleeve. The diameter of the pin 33 is less than the height of the upper half of the hook 31. The length of the pin 33 is greater than or equal to the length of the groove 32. The top of the pin 33 is below the top of the groove 32. The spring 34 is a compression spring. One end of the spring 34 is arranged on the pin 33, and the other end of the spring 34 is arranged on the cylindrical part of the groove 32.
[0033] Pull the latch 33, the latch 33 moves the compression spring 34, and the latch 33 is separated from the rectangular part of the groove 32, then move the upper cover 2 and the lower cover 4, so that the upper cover 2 and the lower cover 4 move to fit the reference platform 1, when the upper cover 2 and the lower cover 4 move, the hook 31 follows the upper cover 2 and the lower cover 4 to move and insert into the groove 32, then release the latch 33, the latch 33 moves to insert into the rectangular part of the groove 32, and passes through the inner corner of the hook 31, thereby limiting the movement of the hook 31 and separating from the groove 32, completing the connection between the upper cover 2 and the lower cover 4 and the reference platform 1, making it easy to fix the upper cover 2 and the lower cover 4 on the reference platform 1, thereby improving the efficiency of the installation work.
[0034] Working principle: the utility model pulls the latch 33, the latch 33 moves the compression spring 34, and the latch 33 is separated from the rectangular part of the groove 32, and then moves the upper cover 2 and the lower cover 4, so that the upper cover 2 and the lower cover 4 move to fit the reference platform 1, when the upper cover 2 and the lower cover 4 move, the hook 31 follows the upper cover 2 and the lower cover 4 to move and insert into the groove 32, and then releases the latch 33, the latch 33 moves to insert into the rectangular part of the groove 32, and passes through the inner corner of the hook 31, thereby limiting the movement of the hook 31 and separating from the groove 32, completing the connection between the upper cover 2 and the lower cover 4 and the reference platform 1, making it easy to fix the upper cover 2 and the lower cover 4 on the reference platform 1, thereby improving the installation work efficiency.
[0035] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A novel jig for chip resistor grinding process, comprising a reference platform (1), an upper cover (2) and a lower cover (4), characterized in that: The upper cover (2) and the lower cover (4) are both provided with cavities, a fixing device (3) is provided between the reference platform (1) and the upper cover (2), and a fixing device (3) is provided between the reference platform (1) and the lower cover (4), the fixing device (3) is used to fix the upper cover (2) and the lower cover (4) on the reference platform (1), the fixing device (3) comprises a hook (31) provided on the upper cover (2) and the lower cover (4), the hook (31) is movably inserted into a groove (32), a latch (33) is movably inserted into the groove (32) for limiting the hook (31) and separating from the hook (31), and a spring (34) is provided on the latch (33) for pushing the latch (33) to move and insert into the groove (32).
2. The novel jig for chip resistor grinding process according to claim 1 is characterized in that: The cavities of the upper cover (2) and the lower cover (4) are respectively arranged outside the center of the upper cover (2) and the lower cover (4).
3. The novel jig for chip resistor grinding process according to claim 2 is characterized in that: The cavities of the upper cover (2) and the lower cover (4) can be divided into independent single-type models or nested double-type models.
4. The novel jig for chip resistor grinding process according to claim 1 is characterized in that: The hook (31) is an L-shaped structure, the length of the hook (31) is less than or equal to the height of the groove (32), and one end of the hook (31) is connected to a side of the upper cover (2) facing the reference platform (1).
5. The novel jig for chip resistor grinding process according to claim 1 is characterized in that: The size of the groove (32) is larger than that of the hook (31). The groove (32) is opened on the reference platform (1). The groove (32) consists of two parts, one of which is a rectangular structure and the other is a cylindrical structure. One end of the cylindrical part of the groove (32) penetrates the side wall of the reference platform (1).
6. The novel jig for chip resistor grinding process according to claim 1 is characterized in that: The length of the latch (33) is less than or equal to the length of the groove (32), the latch (33) is covered with a protective sleeve, the diameter of the latch (33) is less than the height of the upper half of the hook (31), and the top of the latch (33) is below the top of the groove (32).
7. The novel jig for chip resistor grinding process according to claim 1 is characterized in that: The spring (34) is a compression spring, one end of the spring (34) is arranged on the latch (33), and the other end of the spring (34) is arranged on the cylindrical part of the groove (32).