Guiding, forming and spot facing compound tool
By integrating a guide, forming, and countersinking composite tool, the problem of multiple tool changes in bushing hole machining was solved, achieving efficient and precise bushing hole machining and improving the quality and reliability of automotive high-pressure chassis components.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-06
- Publication Date
- 2026-03-06
AI Technical Summary
In the existing technology, the machining of bushing holes requires multiple tool changes, which leads to longer CNC machining time, reduced accuracy and increased production costs, affecting the performance and reliability of automotive high-pressure chassis components.
Design a guide, forming, and countersinking composite tool that integrates guide inserts, forming inserts, countersinking inserts, and chamfering inserts into a single tool, enabling the machining of bushing holes to be completed in one operation, thus avoiding frequent tool changes.
This significantly shortens processing time, improves processing accuracy and efficiency, reduces production costs, and enhances the performance and reliability of automotive high-pressure chassis components.
Smart Images
Figure CN223970874U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a hole machining tool, and more particularly to a guiding, shaping, and countersinking composite tool for machining bushing holes. Background Technology
[0002] In the manufacturing process of automotive high-pressure chassis components, the machining quality of the bushing holes directly affects the performance and reliability of the entire high-pressure chassis component. Therefore, high requirements are placed on the machining accuracy and surface quality of the bushing holes.
[0003] The CNC (Computer Numerical Control) machining of bushing holes mainly involves the following steps: First, roughing is performed to guide the determination of the bushing hole's position; then, finishing is performed to achieve the required dimensional accuracy and ensure precise fitting of the bushing hole; next, the end face is machined by countersinking to improve the end face quality of the bushing hole; finally, chamfering is performed to remove burrs and provide a smooth transition, ultimately obtaining the bushing hole.
[0004] Currently, this machining process cannot be completed in one go; it requires the use of multiple different cutting tools for different machining operations, necessitating multiple tool changes. Each tool change requires resetting and readjusting, which not only increases CNC machining time but can also lead to the accumulation of errors during CNC machining, affecting product consistency and quality. Furthermore, after each tool change, the hole center needs to be re-aligned, a time-consuming and error-prone task. The accuracy of this alignment directly impacts the precision of CNC machining and the final product quality. In summary, multiple tool changes and resetting significantly extend CNC machining time, reducing machining efficiency; frequent tool changes and accumulated errors in alignment lead to decreased machining accuracy, affecting product quality; and the increased machining time and lower yield rate correspondingly increase production costs. Summary of the Invention
[0005] The technical problem to be solved by this utility model is to provide a guiding, shaping, and countersinking composite tool that can complete the machining of bushing holes in one go without frequent tool changes, greatly shortening the machining time, improving machining accuracy, and reducing production costs, thereby improving the performance and reliability of automotive high-pressure chassis components.
[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is as follows: a guide, forming, and countersinking composite tool, including a tool body, characterized in that: the tool body is composed of an integrally set main mounting part and a neck for convenient chamfering, the main mounting part is evenly provided with a plurality of axial mounting notches along the circumferential direction, and the tail of the axial mounting notch extends to the neck, and a guide blade, a forming blade, a countersinking blade and a chamfering blade are sequentially installed in each axial mounting notch from the outside to the inside.
[0007] The front half of each axial mounting notch is provided with a blade mounting groove for mounting the guide blade. After the guide blade is embedded in the blade mounting groove, the cutting edge of the guide blade protrudes from the front end face of the main mounting part. In this structure, the embedded mounting of the guide blade ensures the stability and accuracy of the guide blade, helps to improve the accuracy of the bushing hole position, and makes the replacement of the guide blade simple and quick. The guide blade plays a pioneering role in the entire tool, so its cutting edge protrudes from the front end face of the main mounting part for roughing guidance.
[0008] The cutting edge of the guide insert is formed by two intersecting bevels that meet at the front end to form a protruding tip, with an overall shape resembling an umbrella. This structure allows the guide insert to enter the workpiece material more smoothly during cutting, reducing resistance and impact during initial cutting, thereby reducing cutting force and tool wear. Furthermore, the protruding tip allows for precise positioning of the bushing hole's starting point, reducing deviations during machining and improving machining accuracy.
[0009] Two independent raised rings are integrally formed on the outer peripheral wall corresponding to the rear half of the axial mounting notch of the main mounting part. These two raised rings define the mounting positions of the forming blade and the countersinking blade, ensuring that the size of the forming hole obtained after finishing with the forming blade is larger than the size of the guide hole obtained after rough machining with the guide blade. For example, the single-sided dimension of the guide hole is 0.2 mm smaller than the forming hole. In this structure, setting the raised rings before installing the forming blade ensures that the size of the forming hole is larger than the guide hole. When actually installing the forming blade and the countersinking blade, care must be taken that the portion of the countersinking blade protruding from the outer peripheral wall of the raised ring does not exceed the portion of the forming blade protruding from the outer peripheral wall of the raised ring.
[0010] Each of the axial mounting notches defines a position corresponding to the front convex ring as a first blade mounting position for mounting the forming blade. After the forming blade is welded and mounted on the first blade mounting position, the cutting edge of the forming blade protrudes from the outer peripheral wall of the front convex ring. In this structure, the mounting position of the forming blade is defined, and fine machining is performed after rough machining guidance.
[0011] Each of the axial mounting notches, corresponding to the rear-facing protrusion, defines a second blade mounting position for mounting the countersunk blade. After the countersunk blade is welded and mounted to the second blade mounting position, the cutting edge of the countersunk blade protrudes from the rear end face of the main mounting portion. In this structure, the mounting position of the countersunk blade is defined, and the end face is machined by countersunk after finishing.
[0012] The connection between the main mounting part and the necked section is designed as a tapered surface extending towards the main mounting part. Each axial mounting notch corresponds to a position on the tapered surface as a third blade mounting position for mounting the chamfering blade. After the chamfering blade is welded to the third blade mounting position, the cutting edge of the chamfering blade protrudes from the outer peripheral wall of the tapered surface, and the slope of the chamfering blade matches the slope of the tapered surface to ensure consistency and accuracy in the chamfering process. In this structure, the mounting position of the chamfering blade is defined, and chamfering is performed after the end face is machined by countersinking.
[0013] The guide insert is made of cemented carbide, while the forming insert, countersinking insert, and chamfering insert are all made of polycrystalline diamond. Due to their hardness and wear resistance, cemented carbide and polycrystalline diamond inserts are suitable for different machining needs, improving tool life and machining quality.
[0014] Two axial mounting notches are evenly provided along the circumference of the main mounting part. There are two of each type of guide blade, forming blade, countersinking blade, and chamfering blade, which are installed in the two axial mounting notches respectively, and the installation order of the blades does not affect the function of the tool.
[0015] Compared with the prior art, the advantages of this utility model are:
[0016] By integrating the guide insert, forming insert, countersinking insert, and chamfering insert into a single tool, roughing guidance, finishing forming, countersinking, and chamfering are completed in one operation. This eliminates the need to change tools during CNC machining, significantly reducing machining time, improving efficiency, avoiding repetitive alignment operations, minimizing error accumulation due to human error, improving machining accuracy, and lowering production costs. This technology can be widely applied to chassis components made of high-pressure die-cast aluminum for automobiles. Attached Figure Description
[0017] Figure 1 This is a front view of the composite cutting tool of this utility model;
[0018] Figure 2 This is a partial perspective view of the composite cutting tool of this utility model;
[0019] Figure 3This is a three-dimensional structural diagram of the composite cutting tool of this utility model (the forming blade, countersunk blade, and chamfering blade are not shown).
[0020] Figure 4 This is a schematic diagram of the axial cross-section of the bushing. Detailed Implementation
[0021] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.
[0022] In this utility model, unless otherwise stated, directional terms such as "front," "back," "inner," and "outer" in the terminology only represent the orientation of the term in its conventional use or are common terms understood by those skilled in the art, and should not be regarded as limitations on the term.
[0023] This utility model proposes a composite tool for guiding, shaping, and countersinking, such as... Figure 1 , Figure 2 and Figure 3 As shown, it includes a tool body 1, which consists of an integrally formed main mounting part 11 and a necking part 12 for facilitating chamfering. The main mounting part 11 has a plurality of axial mounting notches 13 evenly distributed along the circumference, and the tail of the axial mounting notch 13 extends to the necking part 12. Each axial mounting notch 13 is installed sequentially from the outside to the inside with a guide blade 2, a forming blade 3, a countersinking blade 4, and a chamfering blade 5. The guide blade 2 is used to guide the bushing hole, the forming blade 3 is used to finish the bushing hole, the countersinking blade 4 is used to countersink the end face of the bushing hole, and the chamfering blade 5 is used to finish the rounded or beveled corners of the bushing hole opening.
[0024] Further defining the design, the front half of each axial mounting notch 13 is provided with a blade mounting groove 14 for mounting the guide blade 2. After the guide blade 2 is embedded in the blade mounting groove 14, the cutting edge 21 of the guide blade 2 is exposed on the front end face of the main mounting part 11. In this structure, the embedded mounting of the guide blade 2 ensures the stability and accuracy of the guide blade 2, helps to improve the accuracy of the bushing hole position, and makes the replacement of the guide blade 2 simple and quick. The guide blade 2 plays a pioneering role in the entire tool, so its cutting edge 21 is exposed on the front end face of the main mounting part 11 for roughing guidance.
[0025] Preferably, the cutting edge 21 of the guide insert 2 is formed by two intersecting bevels 22, which meet at the front end to form a protruding tip 23, with an overall shape resembling an umbrella. This structure of the guide insert 2 allows for smoother entry into the workpiece material during cutting, reducing resistance and impact during initial cutting, thereby reducing cutting force and tool wear. Furthermore, the protruding tip 23 can be used to accurately position the starting point of the bushing hole, reducing deviations during machining and improving machining accuracy.
[0026] Furthermore, two independent raised rings 15 are integrally provided on the outer peripheral wall corresponding to the rear half of the main mounting part 11 and the axial mounting notch 13. The two raised rings 15 define the mounting positions of the forming blade 3 and the countersinking blade 4, so that the size of the forming hole obtained after finishing with the forming blade 3 is larger than the size of the guide hole obtained after rough machining with the guide blade 2. For example, the single-sided size of the guide hole is 0.2 mm smaller than the forming hole. In this structure, setting the raised rings 15 before installing the forming blade 3 ensures that the size of the forming hole is larger than the guide hole. When actually installing the forming blade 3 and the countersinking blade 4, care should be taken that the portion of the countersinking blade 4 protruding from the outer peripheral wall of the raised ring 15 does not exceed the portion of the forming blade 3 protruding from the outer peripheral wall of the raised ring 15.
[0027] Furthermore, the position within each axial mounting notch 13 corresponding to the front-facing convex ring 15 is defined as a first blade mounting position 16 for mounting the forming blade 3. After the forming blade 3 is welded and mounted on the first blade mounting position 16, the cutting edge 31 of the forming blade 3 protrudes from the outer peripheral wall of the front-facing convex ring 15. In this structure, the mounting position of the forming blade 3 is defined, and fine machining is performed after rough machining guidance.
[0028] Furthermore, the position within each axial mounting notch 13 corresponding to the rear-facing protruding ring 15 is defined as a second blade mounting position 17 for mounting the countersunk blade 4. After the countersunk blade 4 is welded and mounted on the second blade mounting position 17, the cutting edge 41 of the countersunk blade 4 is exposed on the rear end face of the main mounting part 11. In this structure, the mounting position of the countersunk blade 4 is defined, and the end face is machined by countersunk after finishing.
[0029] Further defining the design, the connection between the main mounting portion 11 and the necked portion 12 is designed as a tapered surface 18 extending towards the main mounting portion 11. The position within each axial mounting notch 13 corresponding to the tapered surface 18 is defined as a third blade mounting position 19 for mounting the chamfering blade 5. After the chamfering blade 5 is welded and mounted on the third blade mounting position 19, the cutting edge 51 of the chamfering blade 5 protrudes from the outer peripheral wall of the tapered surface 18, and the slope of the chamfering blade 5 is consistent with the slope of the tapered surface 18, ensuring the consistency and accuracy of the chamfering process. In this structure, the mounting position of the chamfering blade 5 is defined, and chamfering is performed after the end face is machined by a countersink.
[0030] Preferably, the guide insert 2 is made of carbide, while the forming insert 3, countersinking insert 4, and chamfering insert 5 are all made of polycrystalline diamond. Due to their hardness and wear resistance, carbide and polycrystalline diamond inserts are suitable for different machining needs, improving tool life and machining quality.
[0031] Preferably, two axial mounting notches 13 are evenly provided along the circumference of the main mounting part 11. Two of each type of guide blade 2, forming blade 3, countersinking blade 4, and chamfering blade 5 are installed in the two axial mounting notches 13 respectively, and the installation order of the blades does not affect the function of the tool.
[0032] Using the cutting tool of this invention, firstly, a guide insert 2 is used for rough machining to guide and determine the position of the bushing hole; then, a forming insert 3 is used for finishing to achieve the required dimensional accuracy and ensure precise fitting of the bushing hole; next, a countersinking insert 4 is used to machine the end face to improve the end face quality of the bushing hole; finally, a chamfering insert 5 is used to remove burrs and provide a smooth transition, ultimately obtaining the bushing hole. Figure 4 A schematic diagram of the axial cross-section of the finished bushing is given, where 9 represents the bushing and 91 represents the bushing hole.
Claims
1. A combined pilot, forming, and counterboring tool comprising a tool body, characterized by: The cutter body is composed of a main mounting part and a neck part for facilitating chamfer machining, the main mounting part is uniformly provided with a plurality of axial mounting notches along the circumference, and the tail of the axial mounting notches extends to the neck part.
2. The combined pilot, forming, and fl aking tool of claim 1, wherein: The front half of each axial mounting notch is provided with a blade mounting groove for mounting the guide blade, and the cutting edge of the guide blade is exposed to the front end surface of the main mounting part after the guide blade is embeddedly mounted in the blade mounting groove.
3. The combined pilot, forming, and fl aking tool of claim 2, wherein: The cutting edge of the guide blade is formed by two intersecting inclined surfaces, and the two inclined surfaces meet at the front end and form a protruding tip.
4. The combined pilot, forming, and fl aking tool of claim 2, wherein: The outer peripheral wall of the main mounting part corresponding to the rear half of the axial mounting notches is integrally provided with two independent convex rings, and the two convex rings define the mounting positions of the forming blade and the dimpling blade, so that the size of the formed hole obtained after the forming blade is finished is larger than the size of the guide hole obtained after the guide blade is rough machined.
5. The combined pilot, forming, and facing tool of claim 4, wherein: The position corresponding to the front convex ring in each axial mounting notch is defined as a first blade mounting position for mounting the forming blade, and the cutting edge of the forming blade is exposed to the outer peripheral wall of the front convex ring after the forming blade is mounted on the first blade mounting position.
6. The combined pilot, forming, and facing cutter of claim 4 wherein: The position corresponding to the rear convex ring in each axial mounting notch is defined as a second blade mounting position for mounting the dimpling blade, and the cutting edge of the dimpling blade is exposed to the rear end surface of the main mounting part after the dimpling blade is mounted on the second blade mounting position.
7. A pilot, forming, and facing compound tool according to any one of claims 1 to 6, characterized in that: The connection between the main mounting part and the neck part is designed as a tapered surface expanding to the side of the main mounting part, the position corresponding to the tapered surface in each axial mounting notch is defined as a third blade mounting position for mounting the chamfering blade, the cutting edge of the chamfering blade is exposed to the outer peripheral wall of the tapered surface after the chamfering blade is mounted on the third blade mounting position, and the slope of the chamfering blade is consistent with the slope of the tapered surface.
8. The combined pilot, forming, and facing cutter of claim 1 wherein: The guide blade is selected from a hard alloy blade, and the forming blade, the dimpling blade and the chamfering blade are all selected from a polycrystalline diamond blade.
9. The combined pilot, forming, and fl aking tool of claim 1, wherein: The main mounting part is uniformly provided with two axial mounting notches along the circumference.