A clamping fixture for grinding an i-type fine planing tool on a five-axis tool grinder

Abstract

A clamping fixture for grinding a type I precision planer on a five-axis tool grinder is provided, comprising a shank and a clamping body. The shank is clamped to a spring collet. The clamping body has two equally spaced and centrally symmetrical clamping slots on its circumference. Each clamping slot is formed by the intersection of a horizontal and an inclined clamping surface, with the included angle equal to the wedge angle ε of the type I precision planer, thus positioning the planer. The clamping body also has two equally spaced and centrally symmetrical screw slots parallel to the axis of the clamping body. Countersunk screws pass through these slots and engage with the threaded hole of the type I precision planer, tightening and fixing the planer onto the clamping slots of the clamping body. This invention achieves high-precision, simple, and efficient machining of the type I precision planer; the fixture has a simple structure, is easy to manufacture, has low processing costs, long service life, and is convenient to install and disassemble; the machining quality is consistent, stable, and reliable, making it suitable for widespread application.

Description

Technical Field

[0001] This utility model belongs to the technical field of fixtures used in grinding and polishing machine tools for operation and transportation, and specifically relates to a clamping fixture for grinding the cutting edge of a type I precision planer on a five-axis tool grinder. Background Technology

[0002] With the rapid development of the machinery industry, machining equipment and methods have also been updated. The Type I precision planer is specifically designed for machining spur bevel gears with a reference tooth angle of 20°. In fields such as machinery manufacturing, automotive, and aerospace, the Type I precision planer plays a crucial role in machining spur bevel gears requiring high precision.

[0003] In the existing technology, for example, Figure 1 , Figure 2 The machining of the cutting edge of the Type I precision planer shown is typically performed on a surface grinder using a sinusoidal magnetic clamp or specialized angle fixtures to ensure the tool's tooth profile angle α = 20° ± 5′, top edge width b ± 0.01, and secondary side edge angle. The cutting parameters of the Type I precision planer are individually corrected through staged machining and independent grinding processes to ultimately meet design tolerances. However, this method suffers from issues such as inadequate dimensional accuracy, consistency, surface roughness, and low production efficiency. To address these issues, the following improved technical solution is proposed. Utility Model Content

[0004] The technical problem solved by this utility model is to provide a clamping fixture for grinding type I precision planing tools on a five-axis tool grinder, thereby solving the technical problem of how to process the cutting edge of type I precision planing tools with high precision, simplicity and efficiency on a five-axis tool grinder.

[0005] The technical solution adopted by this utility model is as follows: A clamping fixture for grinding a type I precision planer on a five-axis tool grinder, comprising a shank and a fixture body; the shank is clamped and connected to the spring collet of the five-axis tool grinder; the fixture body is provided at the end of the shank, and the fixture body has two clamping grooves that are equally divided on the circumference and centrally symmetrical; the clamping grooves are formed by the intersection of a horizontal clamping groove surface and an inclined clamping groove surface, and the included angle of the clamping grooves is equal to the wedge angle ε of the type I precision planer, and the clamping grooves are used to position the type I precision planer; the fixture body also has two screw slot through holes that are equally divided on the circumference and centrally symmetrical, the center line of the screw slot through holes is parallel to the axial direction, and the screw slot through holes are used to install countersunk screws, and the countersunk screws pass through the screw slot through holes and are screwed to fit and connect to the threaded hole of the type I precision planer to be processed, thereby pulling and fixing the type I precision planer on the fixture slot of the fixture body.

[0006] In the above technical solution, the handle and the clamp are integrally formed and are both made of 40Cr alloy structural steel with a hardness of 45HRC to 50HRC.

[0007] In the above technical solution, the handle and the clamping body are further connected by an arc transition.

[0008] In the above technical solution, the handle is further composed of a clamping part and a grinding wheel deflection part, wherein the length of the grinding wheel deflection part is greater than the radius of the grinding wheel.

[0009] In the above technical solution, further: the handle is a φ16 cylindrical straight handle structure with an outer circle runout of no more than 0.003mm; the clamping groove angle is 73°±5′; the screw groove through hole is a long groove structure with a width of 10.5mm and a length of 28mm; the countersunk screw is flush with the clamping body after tightening; the distance from the intersection line of the horizontal clamping groove surface and the inclined clamping groove surface to the axis in the direction of the horizontal clamping groove surface is a fixed value l, the fixed value l is equal to the bottom width of the type I precision planer, l=10mm±0.006mm; the spacing between the parallel horizontal clamping groove surfaces is 17mm±0.02mm, and the parallelism between the horizontal clamping groove surface and the axis of the handle is no more than 0.005mm.

[0010] In the above technical solution, the fixture body and the fixture groove are further processed in one operation using a slow wire EDM machine.

[0011] In the above technical solution, the countersunk screw is a cross-head countersunk screw.

[0012] Advantages of this utility model compared to the prior art:

[0013] 1. This utility model can clamp two type I precision planers to be processed at one time on a five-axis tool grinder, and realize high-precision, simple and efficient processing of the cutting edge of the type I precision planer; the fixture has a simple structure, is easy to manufacture, has low processing cost, long service life, and the workpiece is easy to install and disassemble on the fixture. The workpiece has excellent consistency in processing quality, and is stable and reliable.

[0014] 2. This utility model fixture achieves accurate, reliable, convenient and fast positioning and clamping of the Type I precision planer on the fixture; the two key links of positioning and clamping work closely together, positioning provides an accurate foundation for clamping, and clamping further consolidates the positioning effect, so that the tool can maintain a stable position and posture throughout the grinding process, thereby ensuring the machining accuracy and quality of the tool, while also improving production efficiency and reducing production costs.

[0015] 3. The selection of materials and hardness control in the manufacturing of this utility model fixture have significant technical advantages in terms of structural performance, processing technology, and usage effect. The fixture has high overall strength, good rigidity, good fatigue resistance, guaranteed dimensional accuracy, simplified processing steps, good surface quality, stable heat treatment performance, excellent wear resistance, and strong adaptability.

[0016] 4. The handle and clamping body of this utility model are connected by a rounded transition, which helps to optimize the performance of the fixture's heat treatment, reduce deformation, uniformly distribute the temperature during heat treatment, alleviate stress release, reduce the risk of heat treatment deformation, improve the quality of the fixture's heat treatment, enhance the structural strength and reliability of the fixture, improve fatigue resistance, enhance impact resistance, improve machinability, facilitate tool processing, improve surface quality, and at the same time enhance the safety and ease of maintenance of the fixture, prevent scratches to operators, and facilitate cleaning and maintenance.

[0017] 5. The design of the grinding wheel deflection part of this utility model ensures machining safety, avoids grinding wheel collision, prevents fixture damage, ensures personal safety and normal equipment operation, improves machining quality, ensures the stability of the grinding process, achieves precise grinding control, optimizes equipment adaptability, adapts to different specifications of grinding wheels, is compatible with multiple model processes, extends fixture life, reduces wear and fatigue, reduces heat impact, maintains the performance stability of the shank material, and further improves the service life of the fixture.

[0018] 6. This utility model features precise dimensional and geometric tolerance design for each part of the fixture, offering significant technical advantages in terms of clamping stability, machining accuracy, machining convenience, and versatility. The cylindrical straight shank structure facilitates clamping and ensures coaxiality, which is beneficial for power transmission and balance. The fixture slots precisely match the tool wedge angle, accurately positioning the tool and adapting to tool machining requirements. The screw slot through-hole design provides adjustment flexibility. The countersunk screw design ensures a flat fixture surface and enhances clamping stability. The fixture slot surface intersection design accurately positions the bottom of the tool, and the horizontal fixture slot surface spacing design facilitates machining and ensures accuracy, parallelism, and clamping quality.

[0019] 7. The fixture body and fixture groove of this utility model are formed by slow wire EDM in one step, which ensures machining accuracy, extremely high dimensional accuracy, precise form and position tolerance, improves product quality, reduces the accumulation of clamping errors, improves the surface quality of the tool, enhances clamping stability, has good overall structure, accurate and reliable positioning, improves production efficiency, reduces costs, shortens the production cycle, facilitates quality control and standardized production, facilitates quality traceability, and is conducive to standardized production.

[0020] 8. The countersunk screw design of this utility model reduces the overall weight and height of the clamp, improves stability, reduces vibration, enhances connection rigidity, optimizes operation, facilitates installation and disassembly, reduces space occupation, adapts to clamps with different surface shapes, ensures reliable connection, provides appropriate preload, and prevents corrosion and wear. Attached Figure Description

[0021] Figure 1 This is a front view of the Type I precision planer to be processed according to this utility model;

[0022] Figure 2 for Figure 1 A side view including side cutting edge parameters;

[0023] Figure 3 This is the front view of the fixture of this utility model;

[0024] Figure 4 for Figure 3 The image shows a cross-sectional view of the clamping device, including the countersunk screws to be assembled.

[0025] In the figure: 1-Handle body, 101-Clamping part, 102-Grinding wheel deflection part, 103-Arc, 2-Clamping body, 3-Clamping groove, 4-Screw groove through hole, 5-Counterhead screw, 6-Horizontal clamping groove surface, 7-Inclined clamping groove surface, 8-Type I precision planer. Detailed Implementation

[0026] The following will refer to the appendix in the embodiments of this utility model. Figure 3-4 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] (like Figure 3 (As shown) A clamping fixture for grinding Type I precision planing tools on a five-axis tool grinder comprises a shank 1 and a clamping body 2. The shank 1 is clamped to the spring collet of the five-axis tool grinder, providing a universal and convenient clamping method. During production, the fixture can be quickly installed on the grinder without complex operations or special tools, significantly shortening equipment preparation time and improving production efficiency. Furthermore, the universal and convenient connection method of the shank 1 allows the fixture to be adapted to various models of five-axis tool grinders. As long as the machine tool is equipped with a spring collet, this fixture can be used for grinding Type I precision planing tools, enhancing the fixture's versatility and applicability, and reducing equipment investment costs for enterprises.

[0028] (like Figure 4As shown, the end of the handle 1 is provided with a clamping body 2, which has two clamping grooves 3 that are equally divided on the circumference and centrally symmetrical. The clamping grooves 3 are formed by the intersection of a horizontal clamping groove surface 6 and an inclined clamping groove surface 7. The included angle of the clamping grooves 3 is equal to the wedge angle ε of the type I planing tool 8, and the clamping grooves 3 are used to position the type I planing tool 8. The included angle of the clamping grooves 3 on the clamping body 2 is equal to the wedge angle ε of the type I planing tool 8. This design allows the tool to naturally fit against the groove wall when placed in the clamping groove 3, achieving precise angular positioning. This ensures that the tool maintains the correct posture during grinding, thereby ensuring that the cutting edge angle of the ground type I planing tool 8 meets the design requirements, improving the machining accuracy and quality of the tool. In addition, the clamping grooves 3 are equally divided on the circumference and centrally symmetrically distributed. This layout provides stable and balanced positioning support for the tool. During the grinding process, the forces on the tool in all directions can be evenly distributed, reducing tool vibration and deformation, further improving the machining accuracy and surface quality of the tool.

[0029] The fixture body 2 also has two equally spaced and centrally symmetrical screw slots 4 on the circumference. The centerline of the screw slots 4 is parallel to the axial direction, and the screw slots 4 are used to install countersunk screws 5. The countersunk screws 5 pass through the screw slots 4 and are screwed into the threaded hole of the type I precision planer 8 to be processed, thereby tightening and fixing the type I precision planer 8 on the fixture groove 3 of the fixture body 2. The positioning and tightening of the type I precision planer 8 on the fixture is accurate, reliable, convenient, and fast. The fixture body 2 has two equally spaced and centrally symmetrical screw slots 4 on the circumference, with their centerlines parallel to the axial direction. This design provides a precise position and direction for installing the countersunk screws 5, allowing them to pass smoothly and accurately into the threaded hole of the type I precision planer 8 to be processed. Furthermore, by screwing the countersunk screws 5 through the screw slots 4 and into the threaded hole of the type I precision planer 8, the tool is tightened and fixed on the fixture groove 3 of the fixture body 2. This fixing method is simple and quick to operate, enabling tool clamping to be completed in a short time, thus improving production efficiency. At the same time, the tension is applied evenly to the tool, ensuring it does not loosen during grinding and guaranteeing machining stability and safety.

[0030] In summary, this fixture achieves accurate, reliable, convenient, and rapid positioning and clamping of the Type I precision planer 8. The two key aspects of positioning and clamping work closely together; positioning provides an accurate foundation for clamping, while clamping further solidifies the positioning effect, ensuring the tool maintains a stable position and posture throughout the grinding process. This guarantees the tool's machining accuracy and quality, while also improving production efficiency and reducing production costs.

[0031] In the above embodiments, furthermore: the shank 1 and the fixture 2 are integrally formed and both are made of 40Cr alloy structural steel with a hardness of 45HRC to 50HRC. This material has good comprehensive mechanical properties, good low-temperature impact toughness, and good hardenability. Furthermore, the integral forming design ensures that there are no connecting gaps or weak points between the shank 1 and the fixture 2, resulting in good material continuity and the ability to withstand greater external forces without breakage or damage. During grinding on a five-axis tool grinder, the fixture is subjected to various forces such as the cutting force of the tool and the vibration of the grinder. The integral forming structure ensures that the fixture remains stable under these forces, providing reliable support and positioning for the tool. 40Cr alloy structural steel itself has good rigidity, and the integral forming of the shank 1 and the fixture 2 further enhances the overall rigidity of the fixture. High rigidity means that the fixture is less prone to deformation under stress, ensuring the positional and angular accuracy of the tool during grinding, thereby improving the machining quality of the tool. For example, when grinding the cutting edge of a type I precision planer 8, a high-rigidity fixture ensures that the straightness and surface roughness of the cutting edge meet the requirements. During long-term grinding, the fixture is constantly subjected to alternating stress, making it prone to fatigue cracks. The integrated structure of the shank 1 and fixture body 2, combined with the good toughness of 40Cr alloy structural steel, gives the fixture excellent fatigue resistance, enabling it to withstand large amounts of cyclic loads without fatigue failure, thus extending its service life. The integrated manufacturing of the shank 1 and fixture body 2 allows for the entire shank and fixture body to be manufactured in a single process, reducing the accumulation of errors from multiple clamping and machining operations. Compared to a separate structure, the dimensional accuracy of the integrated fixture is easier to control, better meeting the precision requirements of five-axis tool grinders and ensuring the machining accuracy of the cutting tool. Since the shank 1 and fixture body 2 do not need to be machined and assembled separately, the integrated manufacturing process simplifies the fixture manufacturing process, reducing machining steps and time. This not only reduces production costs but also improves production efficiency, enabling the delivery of qualified fixture products to users more quickly. The integral molding of the handle 1 and the fixture body 2 achieves better surface quality and reduces surface defects and machining marks. 40Cr alloy structural steel has excellent heat treatment properties; through appropriate heat treatment processes, the hardness of the fixture can be controlled between 45HRC and 50HRC. Within this hardness range, the fixture possesses sufficient hardness to resist wear during grinding while also having a certain degree of toughness to prevent brittle fracture. Simultaneously, the heat-treated structure exhibits good uniformity, ensuring consistent performance across different parts of the fixture and improving its reliability. The higher hardness of 45HRC to 50HRC allows the fixture to better resist tool wear and abrasive erosion during grinding, maintaining its shape and dimensional accuracy. This is crucial for fixtures used continuously for extended periods, reducing replacement frequency, lowering production costs, and increasing production efficiency.The one-piece molded fixture, made of 40Cr alloy structural steel, can accommodate the grinding of different specifications and models of Type I precision planers. Its excellent comprehensive performance can meet the requirements of various grinding processes, providing users with greater processing flexibility and versatility.

[0032] In the above embodiments, furthermore, the handle 1 and the fixture body 2 are connected by a circular arc 103. The circular arc 103 has an radius of 10mm, which mainly avoids heat treatment deformation and stress concentration. Furthermore, it exhibits significant technical advantages in several key aspects such as heat treatment performance, structural strength, service life, and processing technology. During heat treatment, various parts of the fixture undergo heating, holding, and cooling stages, and the temperature change rate may differ in different parts. The 10mm circular arc 103 transition makes the geometry at the connection between the handle 1 and the fixture body 2 smoother, reducing sharp edges and abrupt changes. This design helps heat to be conducted and distributed more evenly within the fixture, avoiding uneven thermal expansion and contraction caused by excessively high or low local temperatures, thereby significantly reducing the risk of heat treatment deformation. During heat treatment, various stresses such as phase transformation stress and thermal stress are generated within the material. The circular arc transition structure can provide a relatively gentle stress release path, allowing stress to be distributed more evenly and gradually released within the fixture. Compared to right-angle transitions or other sharp transitions, the R10mm 103 arc effectively avoids localized stress concentration, reducing heat treatment defects such as cracks and deformation caused by stress concentration, and improving the heat treatment quality of the fixture. During the grinding process on a five-axis tool grinder, the fixture is continuously subjected to alternating loads such as cutting forces from the tool and vibrations from the grinder. The R10mm 103 arc transition eliminates stress concentration points at the connection between the shank and the fixture body, allowing stress to be distributed more evenly throughout the transition area. This uniform stress distribution reduces the initiation and propagation of fatigue cracks, thereby improving the fixture's fatigue resistance, extending its service life, and ensuring stable performance during long-term use. When the fixture is clamping or unclamping tools or subjected to accidental collisions, it may be subjected to significant impact forces. The 103 arc transition structure better disperses impact energy, preventing excessive localized stress that could damage the fixture. The 10mm radius of curvature is moderate, providing sufficient cushioning and energy dispersion while ensuring a compact overall fixture structure. This enhances the fixture's impact resistance and improves its reliability. When manufacturing the fixture, using a 10mm radius 103 transition simplifies the tool's machining path. For milling and turning processes, the 103 transition is easier to program and operate than a right-angle transition, reducing the number of tool entry and exit points, lowering machining difficulty, and improving efficiency. Simultaneously, the smoother surface of the 103 transition reduces tool wear and extends tool life. The 103 transition structure also improves the surface finish of the fixture. During machining, the 103 surface allows for smoother coolant flow, effectively carrying away chips and heat, reducing friction and thermal deformation during cutting, thus improving the quality of the machined surface. Good surface quality not only reduces fixture wear during use but also improves tool clamping accuracy and stability.The 10mm radius arc transition (R103) makes the edges of the fixture smoother, avoiding sharp edges and greatly improving operational safety, reducing workplace accidents. The 103 arc transition surface has no dead corners or chip grooves, making cleaning and maintenance of the fixture easier. Chips and grinding fluid impurities do not easily accumulate on the arc surface and can be quickly removed, keeping the fixture clean and in good working condition, extending its service life.

[0033] (like Figure 3 As shown in the above embodiment, the shank 1 is further composed of a clamping part 101 and a grinding wheel deflection part 102. The length of the grinding wheel deflection part 102 is greater than the radius of the grinding wheel. Generally, a grinding wheel with a diameter of φ125mm is selected, which is more than half the diameter of the grinding wheel and has a safety overflow of 10mm over the grinding point.

[0034] It should be noted that the above embodiments are designed with the shank 1 consisting of a clamping part 101 and a grinding wheel deflection part 102. The length of the grinding wheel deflection part 102 is specifically designed, offering significant technical advantages in ensuring machining safety, improving machining quality, optimizing equipment compatibility, and extending fixture life. Sufficient clearance space is provided for the grinding wheel. When grinding a type I planer on a five-axis tool grinder, the grinding wheel may shift due to various factors during high-speed rotation. A sufficiently long grinding wheel deflection part 102 ensures that the grinding wheel will not collide with the clamping part of the shank or other components in case of accidental displacement, thus avoiding grinding wheel breakage, splashing, and other safety accidents. This ensures the personal safety of operators and the normal operation of the equipment, while reducing fixture damage and lowering production costs. When the grinding wheel has sufficient clearance space, it can operate more smoothly during grinding, reducing interference and vibration caused by insufficient space and ensuring the stability of the grinding process. A reasonable design for the length of the grinding wheel deflection part 102 helps to achieve precise control of the grinding depth. Although a φ125mm diameter grinding wheel is generally selected, other wheel specifications may be used in actual production depending on different processing requirements. The design of the grinding wheel deflection section 102, with a length greater than the grinding wheel radius and a safety overflow at the grinding point, gives this fixture a certain degree of versatility, enabling it to adapt to the processing requirements of grinding wheels of different diameters within a certain range. Only the length of the grinding wheel deflection section 102 needs to be ensured to meet safety requirements based on the actual grinding wheel diameter used; no large-scale modification or replacement of the fixture is required, thus improving equipment utilization and production efficiency. Different grinding processes have different requirements for the grinding wheel's movement trajectory and deflection space. The grinding wheel deflection section 102 of this fixture is designed to meet the needs of various grinding processes, such as external cylindrical grinding, internal cylindrical grinding, and surface grinding. When grinding complex-shaped tools on a five-axis tool grinder, the grinding wheel needs to move and deflect in multiple directions. A sufficiently long grinding wheel deflection section 102 provides flexible movement space for the grinding wheel, ensuring the smooth implementation of various grinding processes. Because the wheel deflection section 102 avoids collisions and interference with the grinding wheel, it reduces the impact and friction forces experienced by the shank during grinding. This helps reduce wear and fatigue of the shank material and extends the service life of the fixture. During grinding, the friction between the grinding wheel and the cutting tool generates a large amount of heat. If the grinding wheel collides or interferes with the shank, it will cause a sharp increase in local temperature, generating thermal stress and accelerating thermal fatigue and deformation of the shank material. A well-designed wheel deflection section 102 can reduce this thermal impact, maintain the stability of the shank material's performance, and further improve the service life of the fixture.

[0035] In the above embodiments, furthermore: the shank 1 is a φ16 cylindrical straight shank structure, which facilitates clamping by the spring collet, and the outer diameter runout is no greater than 0.003mm. This standardized straight shank shape has good compatibility with the spring collet, facilitating quick and stable clamping. On equipment such as five-axis tool grinders, the fixture can be quickly installed and positioned, improving production efficiency. Simultaneously, the accuracy requirement of an outer diameter runout of no more than 0.003mm ensures the stability of the shank 1 during rotation, allowing the fixture to maintain high coaxiality during machining, thereby guaranteeing the machining accuracy of the type I precision planer 8 and reducing tool quality defects caused by coaxiality errors. The cylindrical straight shank structure has good symmetry during rotation, which can evenly transmit the power of the grinder spindle, reducing vibration and unbalanced forces. This helps improve the stability of the grinding process, making the contact between the grinding wheel and the tool more uniform, improving the grinding quality of the tool surface, and reducing surface roughness.

[0036] The included angle of the fixture groove 3 is 73°±5′, meaning the wedge angle ε of the type I precision planer 8 is 73°±5′. This precise angle design ensures that the tool is correctly positioned and supported in the fixture groove, maintaining an accurate angular relationship between the tool's cutting edge and the grinding direction, thereby guaranteeing the tool's geometric accuracy and cutting performance. For example, when grinding the cutting edge of the type I precision planer 8, the correct wedge angle ensures the tool has good sharpness and durability during cutting. A suitable fixture groove angle also provides the necessary space and guidance for tool grinding, allowing the grinding wheel to smoothly grind the tool, avoiding problems such as wheel-tool interference or insufficient grinding caused by angle mismatch, and adapting to the tool's machining requirements.

[0037] The screw slot through-hole 4 is a long slot structure with a width of 10.5mm and a length of 28mm. This design provides ample space for the installation and adjustment of the countersunk screw 5. When clamping the type I precision planer 8, the position of the countersunk screw 5 can be flexibly adjusted according to the actual size of the tool and the clamping requirements to ensure that the tool can be firmly fixed in the fixture slot 3. At the same time, the long slot structure can also adapt to the clamping requirements of different specifications of type I precision planer 8, improving the versatility of the fixture.

[0038] After being tightened, the countersunk screw 5 is flush with the fixture body 2. This design makes the surface of the fixture smooth and flat, preventing the protruding part of the countersunk screw 5 from interfering with the grinding wheel or other components during machining. At the same time, the flat surface facilitates cleaning and maintenance of the fixture, reducing the accumulation of impurities such as chips and grinding fluid on the fixture surface, which helps maintain the fixture's accuracy and service life. The flat connection between the countersunk screw 5 and the fixture body 2 also improves the connection strength between the screw and the fixture, allowing the countersunk screw 5 to more firmly fix the tool after tightening, reducing tool loosening and vibration during machining, thereby improving the tool's machining accuracy and surface quality.

[0039] The distance from the intersection line of the horizontal clamping groove 6 and the inclined clamping groove 7 to the axis in the direction of the horizontal clamping groove 6 is a fixed value l, which is equal to the bottom width of the type I precision planer 8, l = 10mm ± 0.006mm (e.g. Figure 2 , Figure 4 (As shown). This precise design ensures that the tool is accurately positioned at the bottom in the fixture slot 3, maintaining a stable position and orientation during machining. Accurate bottom positioning is crucial for ensuring the dimensional and geometric accuracy of the tool, especially during high-precision grinding.

[0040] The horizontally parallel fixture groove surfaces 6 are spaced 17mm ± 0.02mm apart, 1mm larger than the shank 1. This spacing facilitates slow wire EDM machining of the fixture grooves 3 while ensuring the dimensional accuracy of the fixture grooves. Slow wire EDM is a high-precision machining method. The larger spacing provides sufficient operating space for the machining equipment, reduces interference and collisions during machining, and improves the stability and reliability of the machining process. Simultaneously, precise spacing control ensures the parallelism and symmetry between the fixture grooves 3, further improving the tool clamping accuracy and machining quality. Furthermore, the high-precision requirement of the parallelism between the horizontal fixture groove surfaces 6 and the axis of the shank 1 being no greater than 0.005mm ensures that the tool maintains an accurate positional relationship with the shank axis during clamping. During grinding, the rotation axis of the tool must be highly aligned with the axis of the grinding machine spindle; otherwise, machining errors will occur. The high-precision parallelism design reduces such errors and improves the machining accuracy and consistency of the tool.

[0041] In the above embodiments, the fixture body 2 and the fixture groove 3 are further processed in one step using a slow wire EDM machine, thereby ensuring the parallelism requirements in terms of dimensional accuracy and geometric tolerance, ensuring processing accuracy, improving product quality, enhancing clamping stability, improving production efficiency and reducing costs, and facilitating quality control and standardized production.

[0042] It should be noted that the slow wire EDM machine uses an electrode wire (usually copper or molybdenum wire) to perform pulse spark discharge erosion machining on the workpiece. Its discharge energy is precisely controlled, achieving micron-level machining accuracy. The fixture body 2 and fixture slot 3 are machined in a single operation, ensuring that all dimensional parameters of the fixture slot, such as length, width, and depth, strictly meet design requirements with errors controlled within a very small range. For example, for machining some high-precision I-type planer tools, the dimensional accuracy of the fixture slot can be stably controlled within ±0.005mm, providing a solid foundation for precise tool machining. Single-operation machining guarantees the relative positional accuracy between the fixture body 2 and fixture slot 3, especially the form and position tolerances such as parallelism and perpendicularity. If the fixture body and fixture slot are machined separately, errors are inevitable, and these errors accumulate during tool clamping, affecting the tool's machining accuracy. High-precision fixtures can reduce tool vibration and wobble during machining, making the contact between the grinding wheel and the tool more uniform and stable. Under the action of a fixture that completes machining in one step, the cutting force distribution on the tool during grinding is more uniform, and the surface roughness can be effectively controlled, thereby improving the surface quality of the tool and extending its service life. One-step machining makes the fixture body 2 and fixture slot 3 an organic whole, with a more compact and stable structure. The fixture structure has good overall integrity, can withstand greater cutting forces and vibrations, and is less prone to deformation or loosening, providing reliable clamping support for the tool. Because the dimensional accuracy and geometric tolerances of the fixture slot 3 are precisely controlled, the tool can be accurately positioned in the fixture slot during clamping, resulting in a tighter fit with the fixture and accurate and reliable positioning. Completing the fixture body 2 and fixture slot 3 in one step reduces machining steps and assembly time, avoiding production delays caused by multiple clamping and adjustments. Compared with traditional separate machining and assembly methods, the production cycle can be significantly shortened, improving production efficiency. Reducing machining steps and assembly processes not only lowers labor costs but also reduces scrap and rework rates due to assembly errors, thereby reducing production costs. A single-process fixture has clear processing records and quality inspection data, facilitating traceability and management of fixture quality. If quality problems arise during tool processing, the cause can be quickly identified by checking the fixture's processing records, allowing for timely improvement and resolution. This helps companies establish a comprehensive quality management system and improve product quality control. Unified processing techniques and quality standards make fixture production more standardized and regulated. Companies can mass-produce single-process fixtures based on market demand and production capacity, ensuring consistency and interchangeability of fixture quality. This provides strong support for standardized production, improving production management and market competitiveness.

[0043] In the above embodiments, the countersunk screw 5 is a cross-head countersunk screw, which reduces the overall weight and height of the fixture and improves the stability of the fixture. The length of the countersunk screw 5 should be such that it is just exposed after tightening.

[0044] It should be noted that the above embodiments are as follows: Phillips head countersunk screws are typically made of lightweight yet high-strength materials, such as stainless steel and aluminum alloys. Compared to some traditional solid screws or other heavy-duty connectors, they are lighter in weight while still meeting connection strength requirements. Using such lightweight screws in the overall fixture design can effectively reduce the overall weight of the fixture. The countersunk screw design significantly reduces the overall height of the fixture, minimizing interference with machining equipment, providing more machining space for the tool and workpiece, and improving machining flexibility and accuracy. The lighter fixture weight results in less inertial force during machining, significantly reducing the vibration amplitude of the fixture when the machine tool operates at high speed or starts and stops rapidly. The design where the screw is just flush with the surface after tightening ensures full contact and tight fit between the screw and the connected part. This tight connection effectively transmits the cutting force generated during machining, reducing loosening and deformation of the connection, thereby improving the overall rigidity of the fixture. When subjected to large cutting forces, the fixture can maintain a stable structure, ensuring the machining accuracy and consistency of the tool. The Phillips head design makes tightening and loosening screws with a Phillips head screwdriver more convenient and faster. Compared to slotted screws, the Phillips head screwdriver fits more tightly with the screw groove, reducing slippage and minimizing the risk of errors and screw damage during operation. Because the screw head is recessed into the fixture body 2, no protruding part forms on the fixture surface, making it easier for operators to clamp and adjust tools without being interfered with by the screw head. The head shape of the countersunk screw 5 can be designed according to the surface shape of the connected parts, such as flat countersunk or spherical countersunk. This versatile design allows the screw to better adapt to different shaped fixture surfaces, ensuring a tight fit between the screw head and the surface of the fixture body 2, improving the sealing and aesthetics of the connection. Reducing the weight and height of the fixture makes it easier to coordinate with other processing equipment or auxiliary components. The lightweight and low-height fixture reduces interference between devices, improving the overall operating efficiency and stability of the processing system. The screw length should ideally be just flush with the surface after tightening. This ensures adequate preload when tightening, allowing operators to more easily control the tightening and guaranteeing sufficient friction and clamping force at the connection point, preventing loosening during processing. Cross-head countersunk screws typically undergo surface treatments such as zinc plating or nickel plating to improve their corrosion and wear resistance. In processing environments, screws may come into contact with corrosive media such as cutting fluids and coolants; surface treatment effectively protects them from corrosion, extending their service life. Furthermore, high wear resistance reduces wear during frequent assembly and disassembly, ensuring connection accuracy and reliability.

[0045] The working principle of this utility model is as follows: After the Type I precision planer 8 is clamped on the fixture, a dial indicator is used to level the radial horizontal plane, correct the radial runout of the fixture, and quickly find the horizontal center line of the Type I precision planer 8. During batch processing, only one correction is needed. The fixture provided by this utility model requires the writing of corresponding CNC machining programs according to various machine tool systems. During machining, the outer wide surface of the CBN precision grinding wheel is used to grind each cutting edge of the Type I precision planer 8 along the axial direction of the fixture. The grinding switching of each cutting edge of the Type I precision planer 8 is controlled by the program to rotate the workpiece axis, move axially, rotate the grinding wheel, and index to complete the grinding. This utility model fixture, through a single clamping of the Type I precision planer 8, uses two CBN precision grinding wheels in groups to precision grind the three grinding surfaces of the Type I precision planer 8, merging the original three grinding processes into one process. This reduces the number of times tooling changes, grinding wheel corrections, tool setting, and initial inspections are performed, saving a significant amount of processing time, reducing the labor intensity of workers, and improving production efficiency. It also avoids positioning errors caused by multiple clamping operations. It features a simple structure, convenient manufacturing, low cost, long service life, convenient and reliable installation and disassembly of the Type I precision planer 8, and guaranteed machining quality of the cutting edge of the Type I precision planer 8.

[0046] As can be seen from the above description, this utility model provides a clamping fixture for machining the cutting edge of a type I precision planer 8 on a five-axis tool grinder. Using this fixture, two type I precision planers 8 can be machined at once on the five-axis tool grinder. At the same time, the three grinding processes of the three grinding surfaces of the type I precision planer 8 cutting edge can be combined into one process, reducing the number of times tool changes, grinding wheel correction, tool setting, and first inspection are required. This not only saves a lot of processing time, reduces the labor intensity of workers, and improves production efficiency, but also avoids positioning errors caused by multiple clamping. It has the characteristics of simple structure, convenient manufacturing, low processing cost, long service life, convenient and reliable tool installation and disassembly, and guaranteed processing quality.

[0047] In summary, this utility model solves the technical problem of how to process the cutting edge of a type I precision planer with high precision, simplicity, and efficiency on a five-axis tool grinder. It can clamp two type I precision planers 8 to be processed at the same time on a five-axis tool grinder, and achieve high-precision, simple, and efficient processing of the cutting edge of the type I precision planer 8. The fixture has a simple structure, is easy to manufacture, has low processing cost, and long service life. The workpiece is easy to install and remove on the fixture, and the processing quality of the workpiece is consistent, stable, and reliable, making it suitable for widespread application.

[0048] The various embodiments in this specification are described in a related manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0049] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the scope of protection of the present utility model. Any modifications and equivalent substitutions made within the spirit and principles of the present utility model are included within the scope of protection of the present utility model.

Claims

1. A clamping fixture for grinding a type I precision planer on a five-axis tool grinder, characterized in that: It consists of a shank (1) and a clamping body (2); the shank (1) is clamped to the spring collet of a five-axis tool grinder; the end of the shank (1) is provided with a clamping body (2), the clamping body (2) has two clamping grooves (3) that are equally divided on the circumference and centrally symmetrical; the clamping grooves (3) are formed by the intersection of a horizontal clamping groove surface (6) and an inclined clamping groove surface (7), the included angle of the clamping grooves (3) is equal to the wedge angle ε of the type I precision planer (8), and the clamping grooves (3) are used for positioning The fixture body (2) also has two screw slot through holes (4) that are equally divided on the circumference and centrally symmetrical. The center line of the screw slot through hole (4) is parallel to the axial direction, and the screw slot through hole (4) is used to install countersunk screws (5). After the countersunk screws (5) pass through the screw slot through hole (4), they are screwed into the threaded hole of the I-type precision planer (8) to be processed, thereby tightening and fixing the I-type precision planer (8) on the fixture slot (3) of the fixture body (2).

2. The clamping fixture according to claim 1, characterized in that: The handle (1) and clamp (2) are integrally formed and are both made of 40Cr alloy structural steel with a hardness of 45HRC~50HRC.

3. The clamping fixture according to claim 1 or 2, characterized in that: The handle (1) and the clamping body (2) are connected by a circular arc (103).

4. The clamping fixture according to claim 3, characterized in that: The handle (1) is composed of a clamping part (101) and a grinding wheel deflection part (102), the length of which is greater than the radius of the grinding wheel.

5. The clamping fixture according to claim 1, characterized in that: The handle (1) is a φ16 cylindrical straight handle structure with an outer circle runout of no more than 0.003mm; the clamping groove (3) has an included angle of 73°±5′; the screw groove through hole (4) is a long groove structure with a width of 10.5mm and a length of 28mm; the countersunk screw (5) is flush with the clamping body (2) after tightening; the distance between the intersection line of the horizontal clamping groove surface (6) and the inclined clamping groove surface (7) and the axis in the direction of the horizontal clamping groove surface (6) is a fixed value l, which is equal to the bottom width of the type I precision planer (8), l=10mm±0.006mm; the spacing between the parallel horizontal clamping groove surfaces (6) is 17mm±0.02mm, and the parallelism between the horizontal clamping groove surface (6) and the axis of the handle (1) is no more than 0.005mm.

6. The clamping fixture according to claim 1 or 5, characterized in that: The fixture body (2) and fixture groove (3) are processed in one step using a slow wire EDM machine.

7. The clamping fixture according to claim 1 or 5, characterized in that: The countersunk screw (5) is a cross-head countersunk screw.

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