A composite tool for machining a bearing hole of a passenger vehicle knuckle and application thereof

Abstract

The application relates to a passenger car knuckle shaft bearing hole machining composite cutter and application thereof, which comprises a cutter body, two inner hole blades and two outer hole blades, the two inner hole blades are oppositely fixedly installed on the cutter body, the two outer hole blades are oppositely fixedly installed on the cutter body and are cross-distributed with the two inner hole blades; the two outer hole blades are staggered with the two inner hole blades, and the height difference of the two outer hole blades and the two inner hole blades is 0.6mm-1.0mm. The application has the beneficial effect of providing a composite cutter with special structure and reasonable design, which not only improves the machining efficiency of the large hole, but also solves the difficult scheme of roughening of the large hole of all steel forgings, and creates a precedent for the roughening machining mode of the large excess inner hole of the forged steel knuckle.

Description

Technical Field

[0001] This invention relates to the field of composite cutting tools for machining bearing holes, specifically to a composite cutting tool for machining steering knuckle bearing holes in passenger vehicles and its application. Background Technology

[0002] The steering knuckle bearing bore in passenger vehicles refers to the precision support hole on the steering knuckle used to install wheel hub bearings or kingpin bearings. It is a key load-bearing and rotational component of the steering axle, directly affecting steering safety, handling stability, and component lifespan. The bearing bore is typically located at the steering knuckle journal, used for interference fit installation of wheel hub bearings (independent or flanged), bearing radial / axial loads and enabling precise wheel rotation. In some traditional structures, it may also refer to the kingpin bore (for installing kingpin bushings or ball joints), but modern passenger vehicles mostly use integrated wheel hub bearing units, simplifying or eliminating the kingpin structure. This bore has extremely high requirements for roundness, cylindricity (≤0.012mm), surface roughness (Ra≤1.6μm), and positional accuracy relative to the mounting surface.

[0003] Currently, the machining allowance for the steering knuckle bearing holes in steel forgings for passenger vehicles is relatively large, with the bottom of the bearing hole requiring a machining allowance of up to 20mm on one side. Conventional roughing processes require the use of milling cutters, rough boring tools 1, semi-finish boring tools, rough boring tools 2, and chamfering tools, resulting in low machining efficiency. The roughing process takes 3.5 minutes, severely impacting production cycle time and leading to insufficient capacity. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing a composite tool for machining steering knuckle bearing holes in passenger vehicles and its application.

[0005] The technical solution of the present invention to solve the above-mentioned technical problems is as follows: A composite tool for machining steering knuckle bearing holes in passenger vehicles includes: a tool body, two inner hole inserts and two outer hole inserts, wherein the two inner hole inserts are fixedly mounted on the tool body, and the two outer hole inserts are fixedly mounted on the tool body and are arranged in a cross shape with the two inner hole inserts; The two outer hole blades and the two inner hole blades are staggered, and the height difference between the staggered teeth of the two outer hole blades and the two inner hole blades is 0.6mm-1.0mm.

[0006] The beneficial effects of this invention are: during the processing, the inner holes and outer holes on the product are processed simultaneously by using two inner hole blades and two outer hole blades that are arranged in a cross shape on the cutting tool body, which is completed in one step, greatly improving the processing efficiency.

[0007] This invention provides a composite tool with a special structure and reasonable design. This composite tool not only improves the machining efficiency of large holes, but also solves the problem of roughing large holes in all steel forging steering knuckles, pioneering a new method for roughing large-allowance inner holes in forged steel steering knuckles.

[0008] Based on the above technical solution, the present invention can be further improved as follows.

[0009] Furthermore, the blade body is provided with a plurality of chip-collecting grooves at uniform intervals, and the plurality of chip-collecting grooves are distributed alternately with the two outer hole blades and the two inner hole blades.

[0010] The advantages of adopting the above-mentioned further solution are that the structure is simple, and the multiple chip grooves and the two outer hole blades and two inner hole blades are distributed in a more reasonable manner, ensuring that the outer hole and inner hole on the product are processed and formed simultaneously.

[0011] Furthermore, the plurality of chip-receiving grooves extend along one end of the cutter body to the other end, and the two ends of the plurality of chip-receiving grooves are respectively connected.

[0012] The advantages of adopting the above-mentioned further solution are that the structure is simple, the shape of the multiple chip grooves is reasonably designed, which facilitates chip removal during the processing and thus ensures the quality of product processing.

[0013] Furthermore, the groove wall of each of the chip-receiving grooves has an arc-shaped structure with different curvatures along the direction from one end to the other.

[0014] The advantages of adopting the above-mentioned further solution are that the structure is simple, the groove wall shape of each chip groove is reasonably designed, so that the tool body maintains dynamic balance during the machining process, operates stably, and is safe and reliable.

[0015] Furthermore, a cooling channel is provided at the center of the blade body, and multiple cooling holes communicating with the cooling channel are provided at intervals on the groove walls of the multiple chip-collecting grooves.

[0016] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. Coolant is introduced through the cooling channel and discharged through multiple cooling holes in multiple chip grooves to quickly cool the cutting tool that heats up during the machining process and ensure the machining effect.

[0017] Furthermore, the blade body has a structure that is thick at one end and thin at the other end, with two external hole blades and two internal hole blades respectively distributed at the junction of the thick and thin ends of the blade body.

[0018] The advantages of adopting the above-mentioned further solution are that the structure is simple, the shape of the cutter body and the distribution of the two outer hole blades and the two inner hole blades on the cutter body are more reasonable, and the outer hole and inner hole on the product can be processed and formed simultaneously, greatly improving the processing efficiency.

[0019] Furthermore, it also includes two front-end blades, which are fixedly mounted on the thin end of the blade body and located at the thin end of the blade body away from the thick end of the blade body, and correspond one-to-one with the two inner-hole blades.

[0020] The advantages of adopting the above-mentioned further solution are that it has a simple structure, reasonable design, and uses two front-end blades to process and shape small holes on the product, which is convenient and efficient.

[0021] Furthermore, it also includes two chamfering blades, which are installed opposite each other at the coarse end of the blade body near the middle part, and each corresponds to one of the two outer hole blades.

[0022] The advantages of adopting the above-mentioned further solution are that the structure is simple and the design is reasonable. It uses two chamfering inserts to process and shape the chamfer on the side wall of the outer hole, which is convenient and efficient.

[0023] Furthermore, it also includes a handle, which is coaxially fixedly connected to one end of the blade body.

[0024] The advantages of adopting the above-mentioned further solution are that it has a simple structure, reasonable design, and facilitates assembly and processing by connecting the machine tool and the tool body through the tool holder.

[0025] The present invention also relates to the application of a composite tool as described above in the machining process of steering knuckle bearing holes in passenger vehicles.

[0026] The beneficial effect of adopting the above-mentioned further solution is that the present invention provides the application of the composite tool as described above in the machining process of steering knuckle bearing holes in passenger vehicles. It not only improves the machining efficiency of large holes, but also solves the problem of roughing large holes in all steel forging steering knuckles, pioneering a new method for roughing large inner holes in forged steel steering knuckles. Attached Figure Description

[0027] Figure 1 This is one of the overall structural schematic diagrams of the present invention; Figure 2 This is the second schematic diagram of the overall structure of the present invention; Figure 3 This is the third schematic diagram of the overall structure of the present invention; Figure 4 This is the fourth schematic diagram of the overall structure of the present invention; Figure 5 This is the fifth schematic diagram of the overall structure of the present invention; Figure 6 This is the sixth schematic diagram of the overall structure of the present invention; Figure 7 This is one of the schematic diagrams of the end structure of the present invention; Figure 8 This is a second schematic diagram of the end structure of the present invention; Figure 9 This is a perspective view of the present invention.

[0028] Figure 10 This is a schematic diagram showing the distribution of misaligned teeth between the inner and outer hole cutting tools in this invention. Figure 11 This is a schematic diagram of the blank structure of the product before processing in this invention; Figure 12 This is a schematic diagram of the finished product structure after processing in this invention.

[0029] The attached diagram lists the components represented by each number as follows: 1. Tool body; 2. Tool holder; 3. Inner hole insert; 4. Outer hole insert; 5. Chip groove; 6. Cooling channel; 7. Cooling hole; 8. Front end insert; 9. Chamfering insert; 10. Weight reduction groove. Detailed Implementation

[0030] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0031] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the stated features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0032] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this technology based on the specific circumstances.

[0033] In the description of this application, spatial relation terms such as "below," "under," "below," "below," "above," "over," etc., are used herein to describe the relationship between one element or feature shown in the figures and other elements or features. It should be understood that, in addition to the orientation shown in the figures, spatial relation terms also include different orientations of the device in use and operation. For example, if the device in the figures is flipped, an element or feature described as "below" or "under" or "below" of other elements or features will be oriented "above" other elements or features. Therefore, the exemplary terms "below" and "under" can include both upper and lower orientations. Furthermore, the device may also include other orientations (e.g., rotated 90 degrees or other orientations), and the spatial descriptive terms used herein are interpreted accordingly.

[0034] In the description of this application, the term "for example" is used to mean "used as an example, illustration, or description." Any embodiment described as "for example" in this application is not necessarily to be construed as being more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the invention. Details are set forth in the following description for purposes of explanation. It should be understood that those skilled in the art will recognize that the invention can be made without using these specific details. In other instances, well-known structures and processes will not be described in detail to avoid obscuring the description of the invention with unnecessary detail. Therefore, the invention is not intended to be limited to the embodiments shown, but is consistent with the broadest scope of the principles and features disclosed in this application.

[0035] Example 1 like Figures 1 to 12 As shown, this embodiment provides a composite tool for machining steering knuckle bearing holes in passenger vehicles, including: a tool body 1, two inner hole inserts 3 and two outer hole inserts 4. The two inner hole inserts 3 are fixedly mounted on the tool body 1, and the two outer hole inserts 4 are fixedly mounted on the tool body 1 and are arranged in a cross shape with the two inner hole inserts 3. The two outer hole blades 4 and the two inner hole blades 3 are staggered, and the height difference between the staggered teeth of the two outer hole blades 4 and the two inner hole blades 3 is 0.6mm-1.0mm.

[0036] During the processing, the inner holes and outer holes on the product are processed simultaneously using two inner hole blades 3 and two outer hole blades 4 arranged in a cross shape on the cutter body 1, achieving a one-step process and greatly improving processing efficiency.

[0037] This embodiment provides a composite tool with a special structure and reasonable design. This composite tool not only improves the machining efficiency of large holes, but also solves the problem of roughing large holes in all steel forging steering knuckles, pioneering a new method for roughing large inner holes in forged steel steering knuckles.

[0038] Example 2 Based on Embodiment 1, in this embodiment, the blade body 1 is provided with a plurality of chip-receiving grooves 5 at uniform intervals, and the plurality of chip-receiving grooves 5 are distributed alternately with the two outer hole blades 4 and the two inner hole blades 3.

[0039] The scheme has a simple structure, and the multiple chip grooves 5 are arranged in a reasonable manner with the two outer hole blades 4 and the two inner hole blades 3 arranged in an alternating pattern to ensure that the outer and inner holes on the product are processed and formed simultaneously.

[0040] In addition, the design of the multiple chip grooves 5 mentioned above not only facilitates chip removal during the machining process, but also reduces the weight of the entire tool to meet the assembly requirements of the machine tool.

[0041] Example 3 Based on Embodiment 2, in this embodiment, the plurality of chip-collecting grooves 5 extend along one end of the cutter body 1 to the other end, and the two ends of the plurality of chip-collecting grooves 5 are respectively connected.

[0042] The solution has a simple structure and the multiple chip grooves 5 are reasonably shaped to facilitate chip removal during processing, thereby ensuring the quality of product processing.

[0043] Example 4 Based on any one of Embodiments 2 to 3, in this embodiment, the groove wall of each chip groove 5 has an arc-shaped structure with different curvatures along the direction from one end to the other.

[0044] The scheme has a simple structure and the groove wall shape of each chip groove 5 is reasonably designed, so that the tool body 1 maintains dynamic balance during the machining process, operates stably, and is safe and reliable.

[0045] Preferably, in this embodiment, the cross-section of each of the chip grooves 5 is L-shaped, and each of the chip grooves 5 is divided into multiple segments along the direction from one end to the other.

[0046] Example 5 Based on any one of Embodiments 2 to 4, in this embodiment, a cooling channel 6 is provided at the center of the blade body 1, and a plurality of cooling holes 7 communicating with the cooling channel 6 are provided at intervals on the groove walls of the plurality of chip-collecting grooves 5.

[0047] The solution has a simple structure and reasonable design. Coolant is introduced through the cooling channel 6, and coolant is discharged through multiple cooling holes 7 in multiple chip grooves 5 to quickly cool the cutting tool that heats up during the machining process and ensure the machining effect.

[0048] Example 6 Based on any one of Embodiments 2 to 5, in this embodiment, the blade body 1 has a structure that is thick at one end and thin at the other end, and the two outer hole blades 4 and the two inner hole blades 3 are respectively distributed at the junction of the thick end and the thin end of the blade body 1.

[0049] The design is simple in structure, and the shape of the cutter body 1 and the distribution of the two outer hole blades 4 and the two inner hole blades 3 on the cutter body 1 are reasonable. It can simultaneously process the outer and inner holes on the product, greatly improving the processing efficiency.

[0050] Example 7 Based on embodiment 6, this embodiment also includes two front-end blades 8, which are fixedly mounted on the thin end of the blade body 1 and located at the thin end of the blade body 1 away from the thick end of the blade body 1, and correspond one-to-one with the two inner-hole blades 3.

[0051] The solution has a simple structure and reasonable design. It uses two front-end blades to process and shape the small holes on the product, which is convenient and efficient.

[0052] Preferably, in this embodiment, each of the chip grooves 5 is provided with a cooling hole 7 corresponding to the front end blade 8.

[0053] In addition, each of the chip grooves 5 is provided with two cooling holes 7 at intervals corresponding to the inner hole blade 3 or the outer hole blade 4.

[0054] Example 8 Based on Embodiment 6, this embodiment also includes two chamfering blades 9, which are installed opposite each other at the coarse end of the blade body 1 near the middle part, and correspond one-to-one with the two outer hole blades 4.

[0055] The solution has a simple structure and reasonable design. It uses two chamfering inserts 9 to process and shape the chamfer on the side wall of the outer hole, which is convenient and efficient.

[0056] Example 9 Based on the above embodiments, this embodiment also includes a handle 2, which is coaxially fixedly connected to one end of the blade body 1.

[0057] The solution has a simple structure and reasonable design. The machine tool and the tool body 1 are connected by the tool holder 2, which facilitates assembly and processing.

[0058] Preferably, in this embodiment, the end of the handle 2 connected to the blade body 1 is provided with two annular weight-reducing grooves 10 at intervals to reduce the weight of the entire blade.

[0059] Example 10 Based on the above embodiments, this embodiment also provides an application of the composite tool described above in the machining process of steering knuckle bearing holes in passenger vehicles.

[0060] This embodiment provides an application of the composite tool described above in the machining process of steering knuckle bearing holes in passenger vehicles. It not only improves the machining efficiency of large holes, but also solves the problem of roughing large holes in all steel forging steering knuckles, pioneering a new method for roughing large-mast inner holes in forged steel steering knuckles.

[0061] This invention provides a composite tool for machining steering knuckle bearing holes in passenger vehicles and its application. The machining process is as follows: During the processing, the inner holes and outer holes on the product are processed simultaneously using two inner hole blades 3 and two outer hole blades 4 arranged in a cross shape on the cutter body 1, achieving a one-step process and greatly improving processing efficiency.

[0062] This invention employs a novel composite tool for the roughing process of intermediate bearing holes. The application of this novel composite tool can reduce the processing time of the roughing process of bearing holes in front- and back-rotating steel forgings from 3.5 minutes / piece to about 1.5 minutes, increasing the processing efficiency of a single step by more than 60%.

[0063] Furthermore, this composite tool can complete rough milling, rough boring, semi-finish boring, and chamfering in one operation when machining intermediate bearing holes. It can complete the roughing process in one go, while also ensuring that a reasonable allowance is left for subsequent finishing.

[0064] This invention provides a composite tool with a special structure and reasonable design. This composite tool not only improves the machining efficiency of large holes, but also solves the problem of roughing large holes in all steel forging steering knuckles, pioneering a new method for roughing large-allowance inner holes in forged steel steering knuckles.

[0065] The composite tool processing technology provided by this invention has the following advantages: I. Supplementation of Margin 1. The Φ79mm diameter dimension is machined separately using a reasonable step length design, avoiding excessive cutting force caused by simultaneous machining with the Φ109.6mm diameter dimension, which could lead to excessive machine tool load or tool vibration issues. 2. For a diameter of Φ109.6mm, the radial allowance on one side during machining is 15.3mm, which is relatively large for boring tools. To avoid tool jamming and chipping issues caused by single-cut machining, a step with a length of 0.8mm is designed on the Φ92mm diameter. This ensures that the 15.3mm radial allowance on one side of the boring tool is distributed into 6.5mm and 8.8mm. Based on these two machining allowances of 6.5mm and 8.8mm, appropriate insert sizes are selected. The cutting edge length of the 880-07 insert is 12.65mm, and that of the 880-09 insert is 18.6mm. The insert performs optimally (in terms of efficiency, lifespan, cost, etc.) when the workpiece machining allowance is ≤1 / 2 of the insert cutting edge length.

[0066] II. Cooling Channel Design 1. Design the diameter and size of the cooling channel based on the number of cutting inserts and the machining allowance to ensure sufficient coolant pressure and prevent unloading. The main cooling channel for the tool holder has a diameter of Φ12mm, and the cooling holes for the remaining 12 cutting inserts have a diameter of Φ0.9mm, ensuring that the cross-sectional area of ​​the main channel is less than the sum of the cross-sectional areas of the cooling holes for all 12 cutting inserts. 2. As mentioned in the first point, based on the characteristics of the second-stage diameter and the large end face machining allowance, the Φ92mm and Φ109.6mm inserts adopt a double cooling hole design. One cooling hole is aligned with the cutting tip machining position, and the other is aligned with the machining width position. This can not only ensure the cooling of the machining area during machining, but also achieve a good chip curling and chip removal effect.

[0067] III. Blade Material and Groove Type 1. As mentioned in the first point, considering the large machining allowance of the second-stage diameter and end face, the inserts for machining Φ92mm and Φ109.6mm are 880-07 type inserts and 880-09 type inserts. Both types of inserts have high strength and good toughness. The groove type is GM general-purpose chip breaker groove, and the material is 4344 cemented carbide. 2. The GM groove type is a universal chip breaker groove that can ensure sufficient strength while effectively reducing cutting force, making cutting easier and less resistant, ensuring smooth chip removal and making the machining process more stable. 3. 4344 is made of cemented carbide, which has good toughness and resistance to deformation, ensuring both sufficient wear resistance and toughness to prevent chipping.

[0068] IV. Structural Design (Rigidity, Weight) 1. Tool structure design should minimize tool length and ensure sufficient rigidity while ensuring effective machining depth.

[0069] 2. The inserts feature a 90° staggered tooth layout with four teeth evenly distributed. The 0.8mm staggered tooth height between the two types of inserts effectively distributes the machining allowance of each insert, preventing issues such as tooth breakage or jamming during machining. Furthermore, the fully open chip grooves on the four inserts ensure the strength of the insert holder while providing better chip collection and removal, effectively reducing tool weight and machine tool load, and ensuring the tool operates at its optimal condition with the machine tool.

[0070] 3. The chamfering area adopts a double-blade clamp design, which not only ensures convenient adjustment of the chamfer size, but also allows one blade to be removed and used as a backup in case of damage.

[0071] 4. Reduce the weight of the tool in areas where it does not participate in machining to ensure stability during tool changes.

[0072] While embodiments or examples of this disclosure have been described with reference to the accompanying drawings, it should be understood that the above embodiments are merely exemplary embodiments or examples, and the scope of the invention is not limited by these embodiments or examples, but only by the granted claims and their equivalents. Various elements in the embodiments or examples may be omitted or replaced by their equivalents. Furthermore, the steps may be performed in a different order than that described in this disclosure. Further, various elements in the embodiments or examples may be combined in various ways. Importantly, as the technology evolves, many elements described herein can be replaced by equivalents that appear after this disclosure.

Claims

1. A composite tool for machining steering knuckle bearing holes in passenger vehicles, characterized in that, include: The blade body (1), two inner hole blades (3) and two outer hole blades (4) are fixedly mounted on the blade body (1) and the two outer hole blades (4) are fixedly mounted on the blade body (1) and are distributed in a cross shape with the two inner hole blades (3). The two outer hole blades (4) and the two inner hole blades (3) are staggered, and the height difference between the staggered teeth of the two outer hole blades (4) and the two inner hole blades (3) is 0.6mm-1.0mm.

2. The composite tool for machining steering knuckle bearing holes in passenger vehicles according to claim 1, characterized in that, The blade body (1) is provided with a plurality of chip grooves (5) evenly spaced, and the plurality of chip grooves (5) are arranged alternately with the two outer hole blades (4) and the two inner hole blades (3).

3. The composite tool for machining steering knuckle bearing holes in passenger vehicles according to claim 2, characterized in that, The plurality of chip grooves (5) extend from one end of the cutter body (1) to the other end, and the two ends of the plurality of chip grooves (5) are connected.

4. The composite tool for machining steering knuckle bearing holes in passenger vehicles according to claim 2, characterized in that, Each of the chip grooves (5) has a groove wall with different arc-shaped structures along the direction from one end to the other.

5. The composite tool for machining steering knuckle bearing holes in passenger vehicles according to claim 2, characterized in that, A cooling channel (6) is provided at the center of the blade body (1), and multiple cooling holes (7) communicating with the cooling channel (6) are provided at intervals on the groove walls of the multiple chip grooves (5).

6. The composite tool for machining steering knuckle bearing holes in passenger vehicles according to claim 2, characterized in that, The blade body (1) has a structure that is thick at one end and thin at the other end. The two outer hole blades (4) and the two inner hole blades (3) are respectively distributed at the junction of the thick end and the thin end of the blade body (1).

7. The composite tool for machining steering knuckle bearing holes in passenger vehicles according to claim 6, characterized in that, It also includes two front blades (8), which are fixedly mounted on the thin end of the blade body (1) and located at the thin end of the blade body (1) away from the thick end of the blade body (1), and correspond one-to-one with the two inner hole blades (3).

8. The composite tool for machining steering knuckle bearing holes in passenger vehicles according to claim 6, characterized in that, It also includes two chamfering blades (9), which are installed opposite each other at the coarse end of the blade body (1) near the middle part, and correspond one-to-one with the two outer hole blades (4).

9. The composite tool for machining steering knuckle bearing holes in passenger vehicles according to any one of claims 1-8, characterized in that, It also includes a handle (2), which is coaxially fixedly connected to one end of the blade body (1).

10. The application of a composite cutting tool as described in any one of claims 1-9 in the machining process of steering knuckle bearing holes in passenger vehicles.

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