A kind of tooth profile tooling and optical curve grinder processing wide thin punch method

Abstract

The application discloses a tooth-shaped tool and a method for processing a wide-thin punch by an optical curve grinding machine. The tooth-shaped tool comprises a tool body, a plurality of sawtooth-shaped protrusions are arranged on the tool body, tooth-shaped grooves are formed between adjacent sawtooth-shaped protrusions, and the top of the sawtooth-shaped protrusion forms a contact and support line for the wide-thin punch. The method comprises the following steps: applying glue on the tooth-shaped tool, so that the glue fills the tooth-shaped grooves; contacting the wide-thin punch with the top of the sawtooth-shaped protrusion, so that the wide-thin punch is fixedly connected with the tooth-shaped tool by the glue; after the glue is solidified, the tooth-shaped tool and the wide-thin punch are installed on the machine tool platform of the optical curve grinding machine; and the optical curve grinding machine performs grinding processing on the wide-thin punch. The tooth-shaped tool can realize linear contact with the wide-thin punch, so that the micro deformation and heat accumulation in the grinding processing of the wide-thin punch can be effectively reduced, the machining precision is improved, burrs are reduced, the service life of the mold is prolonged, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of electronic component processing technology, specifically to a method for processing wide and thin punches using a toothed tooling and an optical profile grinding machine. Background Technology

[0002] Optical profile grinding (PG) is a core piece of equipment in the field of precision mold manufacturing, widely used in the forming and processing of complex-shaped parts such as leadframe punches. As electronic components develop towards higher density and miniaturization, the pin pitch of leadframe products continues to shrink, increasing the precision requirements for punches. The punch structure is also trending towards wider and thinner designs—that is, the working part is wider but extremely thinner, resulting in poor rigidity and easy deformation.

[0003] In existing technologies, the machining of wide and thin punches typically employs a planar bonding clamping method: the mounting surface of the wide and thin punch is glued to the large plane of the tooling, and then ground using an optical profile grinder. However, this clamping method has the following technical drawbacks: First, the wide and thin punch and the tooling have a large planar contact area, making it difficult for the glue to be distributed completely and evenly, resulting in uneven stress on the punch. During machining, elastic deformation causes dimensional deviations, with deformation reaching 0.005~0.01mm. Second, under the planar bonding method, the cutting heat generated by the grinding wheel of the optical profile grinder cannot be effectively dissipated, leading to heat accumulation and thermal deformation of the wide and thin punch, and even surface burns. Third, after deformation, the wide and thin punch needs to be forcibly corrected before use, which not only increases the number of processes but also easily leads to breakage of the wide and thin punch during use, seriously affecting the mold life and production efficiency. Summary of the Invention

[0004] To address the aforementioned shortcomings of existing technologies, this invention provides a toothed tooling and a method for machining wide and thin punches using an optical profile grinder. The toothed tooling enables line contact with the wide and thin punch, thereby effectively reducing minute deformation and heat accumulation during the grinding process of the wide and thin punch when using this toothed tooling on the optical profile grinder. This, in turn, improves machining accuracy, reduces burrs, extends die life, and increases production efficiency.

[0005] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0006] A toothed tooling includes a tooling body having a first surface and a second surface opposite to each other. The first surface is a bearing surface for a wide and thin punch. The bearing surface for the wide and thin punch has a plurality of parallel serrated protrusions. A toothed groove is formed between adjacent serrated protrusions. A support line is formed at the top of the serrated protrusions. The support line is used to contact the mounting surface of the wide and thin punch.

[0007] Preferably, the serrated protrusions are arranged sequentially at intervals along the length of the tooling body, and the number of the serrated protrusions matches the length of the wide and thin punch.

[0008] The cross-section of the serrated protrusion is triangular or trapezoidal, the top of the serrated protrusion is an arc surface or a plane with a width of less than 0.1 mm, and the center-to-center distance between adjacent serrated protrusions is 0.3~0.8 mm;

[0009] The bottom of the toothed groove is a flat or arc-shaped surface, the depth of the toothed groove is 0.5~2.0mm, and the width of the toothed groove is 0.2~0.5mm.

[0010] Preferably, the second surface of the tooling body is provided with a positioning structure that is connected to the machine tool platform, and the positioning structure includes at least one of a positioning groove, a positioning hole, or a positioning boss.

[0011] The tooling body is provided with an end stop at at least one end along its length direction. The height of the end stop is lower than the height of the serrated protrusion. The end stop is used to contact the end of the wide and thin punch along its length direction to limit the displacement of the punch along its length direction.

[0012] The tooling body is provided with a lateral stop at at least one end along its width direction. The height of the lateral stop is lower than the height of the serrated protrusion. The lateral stop is used to contact the end of the wide and thin punch in the width direction to limit the displacement of the punch in the width direction.

[0013] Preferably, the tooling body is made of tool steel or alloy steel with a hardness of HRC50~60;

[0014] The surface roughness Ra of the sawtooth protrusion is ≤0.4μm; the tops of each sawtooth protrusion are coplanar and together form a supporting reference surface, the flatness tolerance of the supporting reference surface is less than 0.002mm, and the supporting reference surface is parallel to the second surface of the tooling body.

[0015] A method for machining wide and thin punches using an optical profile grinding machine, characterized by comprising the following steps:

[0016] Step S1) Apply adhesive to the toothed tooling as described above, so that the adhesive fills the toothed groove;

[0017] Step S2) The mounting surface of the wide and thin punch to be processed is brought into contact with the top of the serrated protrusion, so that the wide and thin punch and the toothed tooling are bonded and fixed together with glue.

[0018] Step S3) After the adhesive has cured, the toothed tooling together with the wide and thin punch is mounted on the machine tool platform of the optical profile grinder through the second surface;

[0019] Step S4) The wide and thin punch is ground by an optical profile grinding machine.

[0020] Preferably, in step S1), when applying the adhesive, the adhesive is quantitatively injected into the toothed groove, and the amount of adhesive injected is less than the volume of the toothed groove, so that the adhesive is lower than the top of the serrated protrusion in the initial state.

[0021] In step S2), when the wide thin punch contacts the top of the serrated protrusion, a pressure of 0.1~0.5MPa is applied to the wide thin punch so that the mounting surface of the wide thin punch contacts the top of the serrated protrusion. At the same time, the glue is squeezed out of the toothed groove under pressure and fills the gap between the mounting surface of the wide thin punch and the serrated protrusion.

[0022] Preferably, in step S4), during the grinding of the wide and thin punch by the optical profile grinding machine, the rotational speed of the grinding wheel in the optical profile grinding machine is 6000~12000 rpm, the speed of the grinding wheel's up-and-down reciprocating oscillation is 0.5~2.0 m / min, the stroke of the grinding wheel's up-and-down reciprocating oscillation is 60~80 mm, the cutting depth of the grinding wheel per transverse feed is 0.003~0.030 mm, and the speed of the grinding wheel's transverse feed is 0.4~0.6 mm / min.

[0023] Preferably, in step S4), the optical profile grinding machine uses a segmented grinding method when grinding the wide and thin punch. The optical profile grinding machine first performs rough grinding on the wide and thin punch to remove 60% to 80% of the total machining allowance, then performs semi-finish grinding on the wide and thin punch to remove 70% to 80% of the remaining machining allowance, and finally performs finish grinding on the wide and thin punch to the final size.

[0024] Preferably, in step S4), the rotational speed of the grinding wheel during the rough grinding stage is 6000~8000 rpm, and the cutting depth of the grinding wheel per transverse feed is 0.020~0.030 mm;

[0025] During the semi-finishing stage, the grinding wheel speed is 8000~10000rpm, and the cutting depth per transverse feed of the grinding wheel is 0.008~0.020mm;

[0026] During the fine grinding stage, the grinding wheel speed is 10,000~12,000 rpm, and the cutting depth per transverse feed of the grinding wheel is 0.003~0.008 mm.

[0027] Preferably, in step S4), after the optical profile grinding machine finishes processing the wide and thin punch, the toothed fixture and the wide and thin punch are removed together from the machine tool platform of the optical profile grinding machine. The wide and thin punch is separated from the toothed fixture by heating or solvent dissolution, and the residual glue on the surface of the toothed fixture is cleaned.

[0028] Compared with the prior art, the present invention has the following advantages:

[0029] 1. This invention processes a sawtooth protrusion on a toothed tooling, and uses the sawtooth protrusion to make multi-point line contact with the wide and thin punch. That is, multiple parallel support lines are formed on the mounting surface of the wide and thin punch and the top of the sawtooth protrusion, thereby changing the traditional planar bonding into discrete support with multi-point line contact. Simultaneously, the adhesive is initially positioned below the top of the serrated protrusion. This ensures that when the wide, thin punch contacts the top of the serrated protrusion, a pure metal-to-metal line contact is formed first. Then, a pressure of 0.1~0.5MPa is applied to the wide, thin punch, causing the mounting surface of the punch to fit tightly against the top of the serrated protrusion. Under pressure, the adhesive is squeezed upwards from the serrated grooves, filling the tiny gaps between the mounting surface of the wide, thin punch and the serrated protrusion. This process sequence of contact followed by filling ensures the initial positioning accuracy of the punch under pressure. Furthermore, the adhesive filling the serrated grooves forms micro-anchoring points, making the force on the punch more uniform during processing and eliminating elastic deformation caused by uneven adhesive layer. Actual measurements show that the processing deformation of the wide, thin punch is controlled within 0.002mm, reducing it from the original 0.005~0.01mm, thus meeting the precision requirements of high-density lead frames for wide, thin punches.

[0030] 2. This invention breaks away from the traditional planar bonding structure by constructing a microchannel heat dissipation structure between the wide and thin punch and the toothed tooling through a toothed groove. When the grinding wheel rotates at high speed to grind the wide and thin punch, the resulting cutting heat is conducted to its mounting surface through the punch. Since most of the mounting surface of the wide and thin punch is not in direct contact with the toothed tooling but is exposed to the air, the heat can be directly radiated and convected into the air for heat dissipation. At the same time, the reciprocating motion of the grinding wheel drives the surrounding airflow, forming forced convection. The opening direction of the toothed groove intersects with the airflow direction, allowing air to enter the groove and exchange heat with the mounting surface of the wide and thin punch and the surface of the toothed tooling, carrying away the accumulated heat. This significantly improves heat dissipation efficiency, avoids thermal deformation and surface burns caused by heat accumulation, and ensures the geometric accuracy of the wide and thin punch.

[0031] 3. This solution achieves a process chain of efficient rough grinding removal, semi-fine grinding shape correction, and high-precision fine grinding by segmented grinding and refined parameter control (rotation speed, depth of cut, feed rate, etc.), so that the deformation of the wide and thin punch is controlled within 0.002mm.

[0032] 4. Through the coordinated design of toothed tooling and processing methods, this invention enables optical profile grinding machines to effectively reduce micro-deformation and heat accumulation during the grinding of wide and thin punches, thereby improving processing accuracy, reducing burrs, extending mold life, and increasing production efficiency. Attached Figure Description

[0033] Appendix Figure 1 This is a schematic diagram showing the connection between a wide and thin punch and a tooling in the prior art;

[0034] Appendix Figure 2 This is a flowchart of the method for machining wide and thin punches using an optical profile grinder according to the present invention;

[0035] Appendix Figure 3 This is a schematic diagram of the toothed tooling in the method for machining wide and thin punches using an optical profile grinder according to the present invention;

[0036] Appendix Figure 4 This is a schematic diagram showing the connection of the toothed tooling, the wide and thin punch, the grinding wheel, and the machine tool platform from one perspective in the method of machining a wide and thin punch with an optical profile grinding machine according to the present invention.

[0037] Appendix Figure 5 This is a schematic diagram of the connection between the toothed tool, the wide and thin punch, the grinding wheel, and the machine tool platform in the method of machining a wide and thin punch with an optical profile grinding machine according to the present invention;

[0038] Appendix Figure 6 For the appendix Figure 5 Enlarged diagram of point A in the middle.

[0039] Explanation of reference numerals in the attached drawings: 1. Tooling; 2. Wide and thin punch; 3. Glue; 4. Tooling body; 5. Serrated protrusion; 6. Toothed groove; 7. Machine tool platform; 8. Toothed tooling; 9. Grinding wheel. Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0042] Furthermore, in describing representative embodiments, the specification may have presented methods and / or processes as a specific sequence of steps. However, the method or process should not be limited to the specific order of steps described herein, to the extent that it does not depend on such a specific order. As will be understood by those skilled in the art, other sequences of steps are also possible. Therefore, the specific order of steps set forth in the specification should not be construed as a limitation on the embodiments. Moreover, the method and / or process should not be limited to the steps performed in the written order; those skilled in the art will readily understand that these orders can be varied and still remain within the spirit and scope of the embodiments of this application.

[0043] A wide-thin punch is a punch with a relatively large width and an extremely thin thickness. Existing processing methods for this type of wide-thin punch are shown in the appendix. Figure 1 As shown, glue 3 is filled between tooling 1 and wide, thin punch 2, and the two are in surface contact. This method can easily lead to deformation of the wide, thin punch, which in turn can cause burrs and other problems in the products produced. This not only seriously affects the service life of the mold and the processing accuracy of the product, but also greatly reduces production efficiency.

[0044] To address the aforementioned technical problems, this specific embodiment provides a method for machining wide and thin punches using an optical profile grinding machine, as shown in the attached figure. Figure 2 To the attached Figure 6 As shown, it includes the following steps:

[0045] Step S1) Apply glue to the toothed tool 8 so that the glue fills the toothed groove 6.

[0046] Specifically, as shown in the appendix Figure 3As shown, the toothed fixture 8 includes a fixture body 4, which has a first surface and a second surface. The first surface is the bearing surface of the wide and thin punch. Multiple parallel serrated protrusions 5 are arranged on the bearing surface of the wide and thin punch. A toothed groove 6 is formed between adjacent serrated protrusions 5. A support line is formed at the top of each serrated protrusion 5, and the support line is used to contact the mounting surface of the wide and thin punch. In this way, by setting the serrated protrusions 5 and their top support lines, the traditional planar bonding is changed to a multi-point line contact support structure. The mounting surface of the wide and thin punch only contacts the top support lines of each serrated protrusion 5, significantly reducing the bonding area and making the pressure transmission more concentrated and uniform. This avoids stress fluctuations and elastic deformation caused by uneven adhesive layers in large-area planar bonding, laying a structural foundation for subsequent uniform bonding and high-precision processing.

[0047] For example, the serrated protrusions 5 are arranged sequentially at intervals along the length of the tooling body 4, and the number of serrated protrusions 5 matches the length of the wide and thin punch.

[0048] The cross-section of the serrated protrusion 5 is triangular or trapezoidal, and the top of the serrated protrusion 5 is an arc surface or a plane with a width of less than 0.1 mm. The center-to-center distance between adjacent serrated protrusions 5 is 0.3~0.8 mm. The triangular or trapezoidal cross-section of the serrated protrusion 5, with an arc surface or a tiny plane with a width of less than 0.1 mm at the top, ensures the uniform distribution of the support lines and the feasibility of processing.

[0049] The bottom of the toothed groove 6 is a flat or arc-shaped surface, the depth of the toothed groove 6 is 0.5~2.0mm, and the width of the toothed groove 6 is 0.2~0.5mm.

[0050] In this way, the optimized combination of the bottom shape and depth of the toothed groove 6, the groove width, and the center spacing not only ensures sufficient support strength, but also provides ample space for glue filling and heat dissipation. At the same time, the relationship between the number of serrated protrusions 5 and the length of the wide and thin punch is proportional to achieve the matching of support point density and punch rigidity.

[0051] Specifically, for a wide and thin punch with a length of 3-5mm, the tooth tip width of the serrated protrusion 5 is set to 0.2mm, the depth of the toothed groove 6 is set to 0.5-0.8mm, and the groove width of adjacent serrated protrusions 5 is 0.2mm; for a wide and thin punch with a length greater than 5mm, the tooth tip width of the serrated protrusion 5 is set to 0.3mm, the depth of the toothed groove 6 is set to 0.8-1.2mm, and the groove width of adjacent serrated protrusions 5 is 0.3mm.

[0052] Therefore, specific tooth tip width, tooth groove depth, and tooth groove width are set for wide and thin punches of different lengths: for short wide and thin punches of 3~5mm, a tooth tip width of 0.2mm and a tooth groove depth of 0.5~0.8mm are used; for long wide and thin punches greater than 5mm, a tooth tip width of 0.3mm and a tooth groove depth of 0.8~1.2mm are used. This parameter-graded design allows for precise matching between the tooling and the dimensions of the wide and thin punches. Short wide and thin punches obtain sufficient support point density, while long wide and thin punches enhance heat dissipation through larger tooth grooves, avoiding the limitations of a single parameter that cannot meet the processing requirements of wide and thin punches of different specifications.

[0053] For example, the second surface of the tooling body 4 is provided with a positioning structure that connects to the machine tool platform 7. The positioning structure includes at least one of a positioning groove, a positioning hole, or a positioning boss. In this way, the positioning structure (positioning groove, positioning hole, or positioning boss) on the second surface enables the rapid and accurate installation of the toothed tooling 8 and the machine tool platform 7, ensuring the repeatability of the positioning accuracy of the toothed tooling 8 and the machine tool.

[0054] Specifically, at least one end of the tooling body 4 along its length is provided with an end stop, the height of which is lower than the height of the serrated protrusion 5. The end stop is used to contact the end of the wide and thin punch along its length to limit the displacement of the punch along its length. At least one end of the tooling body 4 along its width is provided with a side stop, the height of which is lower than the height of the serrated protrusion 5. The side stop is used to contact the end of the wide and thin punch along its width to limit the displacement of the punch along its width. In this way, the end stop at at least one end along the length contactes the end of the wide and thin punch along its length, and the side stop at at least one end along the width contactes the side of the wide and thin punch along its width. The two together form an L-shaped positioning system, which effectively limits the displacement of the wide and thin punch in two orthogonal directions in the horizontal plane, prevents the wide and thin punch from sliding under the action of grinding force, and significantly improves clamping stability and machining safety.

[0055] Specifically, the tooling body 4 is made of tool steel or alloy steel with a hardness of HRC50~60. By using tool steel or alloy steel and controlling the hardness to HRC50~60, the tooling has sufficient wear resistance and deformation resistance, and can maintain its shape accuracy even after long-term use.

[0056] The surface roughness Ra of the serrated protrusions 5 is ≤0.4μm; the tops of each serrated protrusion 5 are coplanar and together form a supporting reference surface, the flatness tolerance of which is less than 0.002mm, and the supporting reference surface is parallel to the second surface of the tooling body 4. Thus, the surface roughness Ra of the serrated protrusions 5 is ≤0.4μm, reducing the microscopic unevenness of the contact surface with the wide and thin punch; the coplanar tops of each serrated protrusion 5 forming a supporting reference surface with a flatness tolerance of less than 0.002mm and parallel to the second surface ensure the initial flatness of the wide and thin punch during installation, providing an accurate reference datum for subsequent precision machining.

[0057] Specifically, when applying the adhesive, a measured amount of adhesive is injected into the toothed groove 6, and the amount of adhesive injected is less than the volume of the toothed groove 6, so that the adhesive is initially below the top of the serrated protrusion 5. By filling the toothed groove 6 directly with adhesive instead of applying it to the surface of the serrated protrusion 5, the adhesive is prevented from contaminating the top of the serrated protrusion 5 and affecting the contact accuracy.

[0058] For example, an adhesive applicator is used to apply adhesive to the toothed fixture 8, and the diameter of the adhesive applicator is 0.1~0.5mm. In this way, the diameter of the adhesive applicator (0.1~0.5mm) matches the width of the toothed groove 6. During adhesive application, the adhesive applicator precisely controls the injection volume each time through a pressure control mechanism, ensuring that the adhesive is quantitatively filled without overflowing, which greatly improves the repeatability and reliability of the process. The precise design of the adhesive applicator diameter allows it to penetrate deep into the bottom of the toothed groove 6, avoiding uneven adhesive application or air bubbles, and reducing the impact of human operation errors on the bonding quality.

[0059] Step S2) The mounting surface of the wide and thin punch to be processed is brought into contact with the top of the serrated protrusion 5, so that the wide and thin punch and the toothed fixture 8 are bonded and fixed with glue.

[0060] Specifically, when the wide, thin punch contacts the top of the serrated protrusion 5, a pressure of 0.1~0.5MPa is applied to the wide, thin punch, causing the mounting surface of the wide, thin punch to contact the top of the serrated protrusion 5. Simultaneously, under pressure, the adhesive is squeezed upwards from the toothed groove 6 and fills the gap between the mounting surface of the wide, thin punch and the serrated protrusion 5, as shown in the attached figure. Figure 6 As shown.

[0061] In this way, by injecting a measured amount of adhesive into the toothed groove 6, with the injection volume being less than the volume of the toothed groove 6, the adhesive is initially positioned at the bottom of the toothed groove 6 and below the top of the serrated protrusion 5, ensuring that the wide and thin punch and the top of the serrated protrusion 5 first form a pure line contact. Subsequently, a pressure of 0.1~0.5MPa is applied to the wide and thin punch, making the mounting surface of the wide and thin punch fit tightly against the top of the serrated protrusion 5. At the same time, the adhesive is squeezed upward from the toothed groove 6 under pressure, filling the tiny gap between the mounting surface of the wide and thin punch and the serrated protrusion 5. After the adhesive cures, multiple micro-adhesive anchor points are formed, which not only ensures the uniform distribution of adhesive force but also avoids adhesive overflow and contamination, significantly improving the consistency and reliability of the bonding quality.

[0062] Step S3) After the adhesive has cured, mount the toothed fixture 8 along with the wide, thin punch onto the machine tool platform 7 of the optical profile grinder via the second surface, as shown in the attached figure. Figure 4 and attached Figure 5 As shown.

[0063] Step S4) The wide and thin punch is ground by an optical profile grinding machine.

[0064] Specifically, in the grinding of wide and thin punches by an optical profile grinder, the rotational speed of the grinding wheel 9 is 6000~12000 rpm, the reciprocating speed of the grinding wheel 9 is 0.5~2.0 m / min, the stroke of the reciprocating motion of the grinding wheel 9 is 60~80 mm, the cutting depth of the grinding wheel 9 per transverse feed is 0.003~0.030 mm, and the transverse feed speed of the grinding wheel 9 is 0.4~0.6 mm / min.

[0065] In this way, by defining a wide range of grinding parameters for the entire process of rough grinding, semi-finish grinding, and finish grinding: the grinding wheel 9 rotation speed of 6000~12000 rpm adapts to the cutting requirements of different stages; the oscillation speed of 0.5~2.0 m / min and the oscillation stroke of 60~80 mm ensure uniform wear of the grinding wheel 9 and full coverage of the machining area; the cutting depth of 0.003~0.030 mm covers the feed range from roughing to finishing; and the transverse feed speed of 0.4~0.6 mm / min ensures surface finish. These upper-level parameters provide a basis for subsequent segmentation and refinement, ensuring the overall controllability and stability of the grinding process.

[0066] Specifically, the optical profile grinding machine is the GLS-821 type optical forming grinding machine, which includes a grinding wheel 9 reciprocating motion adjustment device, a CCD image acquisition device, and a grinding wheel 9 wear compensation device. The grinding wheel 9 reciprocating motion adjustment device precisely controls the movement trajectory of the grinding wheel 9; the CCD image acquisition device monitors the workpiece contour in real time and compares it with a magnified image; the grinding wheel 9 wear compensation device automatically calculates and compensates for the wear of the grinding wheel 9. These three devices work together to achieve real-time monitoring and precision compensation of the machining process, further ensuring the consistency of punch dimensions and machining efficiency.

[0067] Specifically, when the optical profile grinder grinds the wide and thin punch, it adopts a segmented grinding method. First, the optical profile grinder rough grinds the wide and thin punch to remove 60% to 80% of the total machining allowance. During the rough grinding stage, the rotation speed of the grinding wheel 9 is 6000 to 8000 rpm, and the cutting depth of the grinding wheel 9 is 0.020 to 0.030 mm per transverse feed. Then, the wide and thin punch is semi-finished to remove 70% to 80% of the remaining machining allowance. During the semi-finished grinding stage, the rotation speed of the grinding wheel 9 is 8000 to 10000 rpm, and the cutting depth of the grinding wheel 9 is 0.008 to 0.020 mm per transverse feed. Finally, the wide and thin punch is finished to the final size. During the finish grinding stage, the rotation speed of the grinding wheel 9 is 10000 to 12000 rpm, and the cutting depth of the grinding wheel 9 is 0.003 to 0.008 mm per transverse feed.

[0068] Thus, a segmented grinding method with gradient parameters is adopted: In the rough grinding stage (6000~8000 rpm, depth of cut 0.020~0.030 mm), 60%~80% of the total material is removed, achieving efficient material removal; in the semi-finish grinding stage (8000~10000 rpm, depth of cut 0.010~0.020 mm), 70%~80% of the remaining material is removed, correcting the shape error after rough grinding; in the finish grinding stage (10000~12000 rpm, depth of cut 0.003~0.008 mm), combined with an oscillation speed of 0.5~2.0 m / min, an oscillation stroke of 60~80 mm, and a transverse feed speed of 0.4~0.6 mm / min, high-precision forming is achieved. The parameters of each stage form a reasonable gradient, ensuring efficiency while controlling the punch deformation within 0.002 mm.

[0069] Specifically, after the optical profile grinder completes the machining of the wide and thin punch, the toothed fixture 8 and the wide and thin punch are removed together from the machine tool platform 7 of the optical profile grinder. The wide and thin punch is separated from the toothed fixture 8 by heating or solvent dissolution, and the residual adhesive on the surface of the toothed fixture 8 is cleaned. After machining, the punch is separated from the fixture by heating or solvent dissolution and the residual adhesive is cleaned, allowing the toothed fixture 8 to be reused, significantly reducing production costs.

[0070] Compared with the prior art, the present invention processes a sawtooth protrusion 5 on the toothed tooling 8 and uses the sawtooth protrusion 5 to make multi-point line contact with the wide and thin punch. That is, multiple parallel support lines are formed on the mounting surface of the wide and thin punch and the top of the sawtooth protrusion 5, thereby changing the traditional planar bonding into discrete support with multi-point line contact. Simultaneously, the adhesive is initially positioned below the top of the serrated protrusion 5. This ensures that when the wide, thin punch contacts the top of the serrated protrusion 5, a pure metal-to-metal line contact is formed first. Then, a pressure of 0.1~0.5MPa is applied to the wide, thin punch, causing the mounting surface of the punch to fit tightly against the top of the serrated protrusion 5. At the same time, under pressure, the adhesive is squeezed upwards from the toothed groove 6, filling the tiny gap between the mounting surface of the wide, thin punch and the serrated protrusion 5. This process sequence of contact followed by filling ensures the initial positioning accuracy of the punch under pressure. Furthermore, the adhesive filling the toothed groove 6 forms micro-anchoring points, making the force on the punch more uniform during processing and eliminating elastic deformation caused by uneven adhesive layer. Actual measurements show that the processing deformation of the wide, thin punch is controlled within 0.002mm, reducing it from the original 0.005~0.01mm, thus meeting the precision requirements of high-density lead frames for wide, thin punches.

[0071] This invention breaks away from the traditional planar bonding structure where the mounting surface of the wide, thin punch and the tooling are in large-area contact by constructing a microchannel heat dissipation structure between the toothed groove 6 and the wide, thin punch. When the grinding wheel 9 rotates at high speed to grind the wide, thin punch, the resulting cutting heat is conducted to its mounting surface through the punch. Since most of the mounting surface of the wide, thin punch is not in direct contact with the toothed tooling 8 but is exposed to the air, the heat can be directly radiated and convected into the air for heat dissipation. At the same time, the reciprocating motion of the grinding wheel 9 drives the surrounding airflow, forming forced convection. The opening direction of the toothed groove 6 intersects with the airflow direction, allowing air to enter the groove and exchange heat with the mounting surface of the wide, thin punch and the surface of the toothed tooling 8, carrying away the accumulated heat. This significantly improves the heat dissipation efficiency, avoids thermal deformation and surface burns caused by heat accumulation, and ensures the geometric accuracy of the wide, thin punch.

[0072] This solution achieves a process chain of efficient rough grinding removal, semi-fine grinding shape correction, and high-precision fine grinding by segmented grinding and refined parameter control (rotation speed, depth of cut, feed rate, etc.), which controls the deformation of wide and thin punches within 0.002mm.

[0073] This invention, through the coordinated design of toothed tooling and processing methods, enables optical profile grinding machines to effectively reduce micro-deformation and heat accumulation during the grinding of wide and thin punches, thereby improving processing accuracy, reducing burrs, extending mold life, and increasing production efficiency.

[0074] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit the technical solutions. Those skilled in the art should understand that any modifications or equivalent substitutions to the technical solutions of the present invention without departing from the spirit and scope of the present invention should be covered within the scope of the claims of the present invention.

Claims

1. A toothed tool, characterized in that, The toothed fixture includes a fixture body, which has a first surface and a second surface. The first surface is a bearing surface for a wide and thin punch. The bearing surface for the wide and thin punch has a plurality of parallel serrated protrusions. A toothed groove is formed between adjacent serrated protrusions. A support line is formed at the top of the serrated protrusions. The support line is used to contact the mounting surface of the wide and thin punch.

2. The toothed tooling according to claim 1, characterized in that, The serrated protrusions are arranged sequentially at intervals along the length of the tooling body, and the number of the serrated protrusions matches the length of the wide and thin punch. The cross-section of the serrated protrusion is triangular or trapezoidal, the top of the serrated protrusion is an arc surface or a plane with a width of less than 0.1 mm, and the center-to-center distance between adjacent serrated protrusions is 0.3~0.8 mm; The bottom of the toothed groove is a flat or arc-shaped surface, the depth of the toothed groove is 0.5~2.0mm, and the width of the toothed groove is 0.2~0.5mm.

3. The toothed tooling according to claim 2, characterized in that, The second surface of the tooling body is provided with a positioning structure that is connected to the machine tool platform. The positioning structure includes at least one of a positioning groove, a positioning hole, or a positioning boss. The tooling body is provided with an end stop at at least one end along its length direction. The height of the end stop is lower than the height of the serrated protrusion. The end stop is used to contact the end of the wide and thin punch along its length direction to limit the displacement of the punch along its length direction. The tooling body is provided with a lateral stop at at least one end along its width direction. The height of the lateral stop is lower than the height of the serrated protrusion. The lateral stop is used to contact the end of the wide and thin punch in the width direction to limit the displacement of the punch in the width direction.

4. The toothed tooling according to claim 3, characterized in that, The tooling body is made of tool steel or alloy steel with a hardness of HRC50~60. The surface roughness Ra of the sawtooth protrusion is ≤0.4μm; the tops of each sawtooth protrusion are coplanar and together form a supporting reference surface, the flatness tolerance of the supporting reference surface is less than 0.002mm, and the supporting reference surface is parallel to the second surface of the tooling body.

5. A method for machining wide and thin punches using an optical profile grinding machine, characterized in that, Includes the following steps: Step S1) Apply adhesive to the toothed tooling as described in any one of claims 1 to 4, so that the adhesive fills the toothed groove; Step S2) The mounting surface of the wide and thin punch to be processed is brought into contact with the top of the serrated protrusion, so that the wide and thin punch and the toothed tooling are bonded and fixed together with glue. Step S3) After the adhesive has cured, the toothed tooling together with the wide and thin punch is mounted on the machine tool platform of the optical profile grinder through the second surface; Step S4) The wide and thin punch is ground by an optical profile grinding machine.

6. The method for machining wide and thin punches using an optical profile grinder according to claim 5, characterized in that, In step S1), when applying glue, a measured amount of glue is injected into the toothed groove, and the amount of glue injected is less than the volume of the toothed groove, so that the glue is lower than the top of the serrated protrusion in the initial state. In step S2), when the wide thin punch contacts the top of the serrated protrusion, a pressure of 0.1~0.5MPa is applied to the wide thin punch so that the mounting surface of the wide thin punch contacts the top of the serrated protrusion. At the same time, the glue is squeezed out of the toothed groove under pressure and fills the gap between the mounting surface of the wide thin punch and the serrated protrusion.

7. The method for machining wide and thin punches using an optical profile grinder according to claim 6, characterized in that, In step S4), during the grinding of the wide and thin punch by the optical profile grinding machine, the rotational speed of the grinding wheel in the optical profile grinding machine is 6000~12000 rpm, the speed of the grinding wheel's up-and-down reciprocating oscillation is 0.5~2.0 m / min, the stroke of the grinding wheel's up-and-down reciprocating oscillation is 60~80 mm, the cutting depth of the grinding wheel per transverse feed is 0.003~0.030 mm, and the speed of the grinding wheel's transverse feed is 0.4~0.6 mm / min.

8. The method for machining wide and thin punches using an optical profile grinder according to claim 7, characterized in that, In step S4), the optical profile grinding machine uses a segmented grinding method when grinding the wide and thin punch. The optical profile grinding machine first performs rough grinding on the wide and thin punch to remove 60% to 80% of the total machining allowance, then performs semi-finish grinding on the wide and thin punch to remove 70% to 80% of the remaining machining allowance, and finally performs finish grinding on the wide and thin punch to the final size.

9. The method for machining wide and thin punches using an optical profile grinder according to claim 8, characterized in that, In step S4), the grinding wheel speed is 6000~8000 rpm during the rough grinding stage, and the cutting depth of the grinding wheel per transverse feed is 0.020~0.030 mm. During the semi-finishing stage, the grinding wheel speed is 8000~10000rpm, and the cutting depth per transverse feed of the grinding wheel is 0.008~0.020mm; During the fine grinding stage, the grinding wheel speed is 10,000~12,000 rpm, and the cutting depth per transverse feed of the grinding wheel is 0.003~0.008 mm.

10. The method for machining wide and thin punches using an optical profile grinder according to claim 9, characterized in that, In step S4), after the optical profile grinding machine finishes processing the wide and thin punch, the toothed fixture and the wide and thin punch are removed from the machine tool platform of the optical profile grinding machine. The wide and thin punch is separated from the toothed fixture by heating or solvent dissolution, and the residual glue on the surface of the toothed fixture is cleaned.

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