A tumbler and method of using the same

Abstract

This invention relates to the field of parts processing technology, and in particular to a burnishing cutter and its method of use. The burnishing cutter includes a shank, a burnishing element, a bearing, a mounting component, and a locking component. The shank has a mounting hole that matches the burnishing element, and the burnishing element is rotatably mounted in the mounting hole. The shank also has a receiving cavity and a through hole, which are sequentially connected. The bearing is rotatably mounted in the receiving cavity via the mounting component, and the outer ring of the mounted bearing contacts the burnishing element, forming a contact point one. The locking component is located in the through hole and can contact the outer ring of the bearing, forming a contact point two. By adjusting and fixing the position of the locking component, the compressive force it applies to the outer ring of the bearing at contact point two can be changed, thereby adjusting the flexibility of the bearing rotation and changing the relative motion between the burnishing element and the surface of the part. After burnishing high-toughness materials such as titanium alloys using this burnishing cutter, a surface roughness of Ra0.2 can be achieved.

Description

Technical Field

[0001] This invention relates to the field of parts processing technology, and in particular to a burnishing cutter and its method of use. Background Technology

[0002] The assembly surfaces of machined parts, such as critical aircraft components and hydraulic system piping connections, involve motion and sealing requirements. These parts require a surface roughness of Ra0.2 or higher. Traditional turning can only achieve a maximum of Ra0.8; achieving Ra0.2 requires finishing. In finishing, the most critical factor affecting surface roughness is the burnishing tool. Currently, the mainstream burnishing tools are ball-end burnishing cutters and roller burnishing cutters. The movement between the cutter tip and the surface of the part to be burnished is either pure rolling or pure sliding, unable to achieve an intermediate state of both.

[0003] For example, in the prior art, there is a burnishing cutter disclosed in Chinese utility model patent document CN202192397U, published on April 18, 2012; a composite burnishing cutter disclosed in Chinese utility model patent document CN221134752U, published on June 14, 2024; and a precision complex CNC lathe inner hole diamond burnishing cutter disclosed in Chinese utility model patent document CN209255875U, published on August 16, 2019.

[0004] In practical applications, when finishing the surfaces of parts with good toughness, such as titanium alloys, the aforementioned purely sliding ball-end burnishing cutters and purely rolling roller burnishing cutters cannot achieve the required surface roughness of Ra0.2 after finishing. Summary of the Invention

[0005] To solve the above-mentioned technical problems, this invention proposes a burnishing knife and its usage method. After burning and polishing high-toughness materials such as titanium alloys with this burnishing knife, the surface roughness can reach Ra0.2.

[0006] This invention is achieved by adopting the following technical solution:

[0007] A burnishing cutter includes a handle, a burnishing element, a bearing, a mounting component, and a locking component. The handle has a mounting hole that matches the burnishing element, and the burnishing element is rotatably mounted in the mounting hole. The handle also has a receiving cavity and a through hole, which are sequentially connected. The bearing is rotatably mounted in the receiving cavity via the mounting component, and the outer ring of the mounted bearing contacts the burnishing element, forming a contact point one. The locking component is located in the through hole and can contact the outer ring of the bearing, forming a contact point two. By adjusting and fixing the position of the locking component, the compressive force it applies to the outer ring of the bearing at contact point two can be changed, thereby adjusting the flexibility of the outer ring's rotation and altering the relative motion between the burnishing element and the surface of the part.

[0008] The central axes of the burnishing element and the locking element are collinear and perpendicular to the central axis of the bearing.

[0009] The central axis of the burnishing element and the locking element coincides with the radial centerline that passes through the geometric center of the bearing.

[0010] The mounting components include a support shaft, a limiting ring, a washer, and a screw. The bearing and the limiting ring are sequentially mounted on the support shaft, and the screw passes through the washer and is screwed into the support shaft.

[0011] The through hole is a threaded hole, and the locking element is a clamping screw that matches the threaded hole.

[0012] The end of the clamping screw near the bearing is rounded.

[0013] A retaining ring is provided around the mounting hole to prevent the tumbler element from falling off.

[0014] The rolling element is spherical or cylindrical.

[0015] When the burnishing element is cylindrical, both ends are spherical bulges, and two line contacts and two point contacts are formed between the burnishing element and the mounting hole.

[0016] The diameter of the calendering element is 3mm to 5mm.

[0017] According to the above method of using the burnishing cutter, when burnishing is required, adjust the position of the locking part, and further adjust the squeezing force applied by the locking part to the outer ring of the bearing at contact point two: when the squeezing force is large enough, the outer ring of the bearing is locked, and the burnishing element and the surface of the part are in a pure sliding running state; when the squeezing force is moderate, the outer ring of the bearing can rotate, but cannot rotate flexibly, and the burnishing element and the surface of the part are in a mixed sliding and rolling motion state; when the locking part is not in contact with the outer ring of the bearing, the outer ring of the bearing rotates flexibly, and the burnishing element and the surface of the part are in a pure rolling motion state.

[0018] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0019] 1. The burnishing cutter of this invention, during processing, can achieve "pure sliding," "mixed sliding and rolling," and "pure rolling" motion states by adjusting the relative motion state between the burnishing element and the workpiece surface, thereby meeting the requirements for improving the surface roughness of different materials. Practical verification has shown that although this burnishing cutter design has a simple structure, it solves the problem that traditional burnishing cutters relying on pure sliding or pure rolling cannot significantly improve the surface roughness of highly elastic materials such as titanium alloys, achieving a surface roughness of Ra0.2.

[0020] 2. The burnishing knife of the present invention has a wide range of applications and good burnishing effect. It is mainly used for high-precision surface finishing of parts with sealing requirements such as hydraulic system pipeline connectors. It can significantly improve the surface roughness of parts and increase the compressive stress on the surface of parts, thereby improving sealing performance and product service life.

[0021] 3. The core structure of the burnishing cutter of the present invention is compact. By changing the shape of the burnishing element (from spherical to cylindrical) and changing the style of the cutter holder structure, the burnishing efficiency of the cutter can be further improved and its application range expanded. It can be used for finishing of various morphological features such as outer shaft surface, inner hole surface, and conical surface, and has the characteristics of strong versatility and strong applicability.

[0022] 4. Through the structural design of the burnishing cutter, the burnishing element of the burnishing cutter can be designed in a small size, so that the burnishing effect of the part surface can be achieved under a small extrusion pressure. It can not only realize the burnishing of weak rigid parts, but also improve the durability of the tool.

[0023] 5. In this invention, the central axes of the burnishing element and the locking element are collinear and perpendicular to the central axis of the bearing. Furthermore, the central axes of the burnishing element and the locking element coincide with the radial center line passing through the geometric center of the bearing, so that contact point one and contact point two are symmetrically arranged at both ends of the bearing and located in the middle of the bearing, making the force transmission more uniform. Attached Figure Description

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments, wherein:

[0025] Figure 1 This is an exploded view of the burnishing knife in this invention;

[0026] Figure 2 This is an assembly diagram of the burnishing knife in this invention;

[0027] Figure 3 This is an isometric view of the burnishing knife used in this invention.

[0028] Figure 4 This is a schematic diagram of the planar structure of the burnishing knife in this invention;

[0029] Figure 5 This is a schematic cross-sectional view of AA in this invention;

[0030] Figure 6 This is an exploded cross-sectional view of AA in this invention;

[0031] Figure 7 This is a schematic diagram of the cross-sectional structure of BB in this invention;

[0032] Figure 8 This is an enlarged schematic diagram of region C in this invention;

[0033] Figure 9 This is a schematic diagram of the force analysis of the burnishing element in the burnishing knife of the present invention. Figure 1 ;

[0034] Figure 10 This is a schematic diagram of the force analysis of the burnishing element in the burnishing knife of the present invention. Figure 2 ;

[0035] Figure 11 This is a cross-sectional view of the operation and transmission of the burnishing knife in this invention;

[0036] Figure 12 An isometric view of the burnishing knife containing a cylindrical burnishing element in this invention;

[0037] Figure 13 This is a partially enlarged view of the assembly position of the cylindrical burnishing element in this invention;

[0038] Figure 14 This is a schematic diagram of the cylindrical rolling element in this invention;

[0039] Figure 15 This is a schematic diagram of the burnishing process using a right-angled burnishing cutter in this invention. Figure 1 ;

[0040] Figure 16 This is a schematic diagram of the burnishing process using a right-angled burnishing cutter in this invention. Figure 2 ;

[0041] Marked in the image:

[0042] 1. Part, 2. Burnishing knife, 21. Knife holder, 22. Burnishing element, 23. Bearing, 24. Support shaft, 25. Limiting ring, 26. Washer, 27. Screw, 28. Clamping screw, 211. Closing ring, 212. Threaded hole, 213. Mounting hole, 221. Contact point one, 222. Contact point between part and burnishing element, 281. Contact point two. Detailed Implementation

[0043] Example 1

[0044] As a basic embodiment of the present invention, the present invention includes a burnishing knife, comprising a handle 21, a burnishing element 22, a bearing 23, a mounting component, and a locking component. The handle 21 has a mounting hole 213 that matches the burnishing element 22, and the burnishing element 22 is rotatably disposed within the mounting hole 213. The handle 21 also has a receiving cavity and a through hole, and the mounting hole 213, the receiving cavity, and the through hole are sequentially connected. The bearing 23 is rotatably mounted in the receiving cavity via the mounting component, and the outer ring of the mounted bearing 23 contacts the burnishing element 22, forming a contact point 221. The structure of the mounting component can employ conventional techniques in the art, for example, it may include a central shaft and a locking nut. The central shaft is directly connected to the inner ring of the bearing 23, and the locking nut is used to fix the position of the central shaft and prevent it from loosening during use.

[0045] The locking element is disposed within the through hole, and its position can be adjusted to allow it to contact or not contact the outer ring of the bearing 23, forming contact point 281 when in contact. The locking element can employ conventional techniques in the art, such as adjusting screws or locating pins, and is locked using a corresponding locking mechanism. Specifically, it can be implemented using lock nuts, self-locking threads, or locking pins.

[0046] By adjusting and fixing the position of the locking element, the squeezing force applied to the outer ring of the bearing 23 at contact point 281 can be changed, thereby adjusting the flexibility of the outer ring of the bearing 23 rotation, and thus changing the relative motion between the burnishing element 22 and the surface of the part 1. During burnishing, the state of the burnishing element 22 on the surface of the part 1 can be switched between three states: "completely rolling", "both rolling and sliding", and "completely sliding".

[0047] Example 2

[0048] In a preferred embodiment of the present invention, the present invention includes a burnishing knife, comprising a handle 21, a burnishing element 22, a bearing 23, a mounting component, and a locking component. In this embodiment, the burnishing element 22 may be spherical. The handle 21 is provided with a mounting hole 213 that matches the burnishing element 22, and the burnishing element 22 is rotatably disposed within the mounting hole 213.

[0049] The tool holder 21 is also provided with a receiving cavity and a through hole, and the mounting hole 213, the receiving cavity, and the through hole are connected in sequence. The bearing 23 is rotatably mounted in the receiving cavity by a mounting component, and the outer ring of the mounted bearing 23 contacts the burnishing element 22, forming contact point one 221. The locking component is disposed in the through hole and can contact the outer ring of the bearing 23, forming contact point two 281.

[0050] The central axes of the burnishing element 22 and the locking member are collinear and perpendicular to the central axis of the bearing 23. Preferably, the central axes of the burnishing element 22 and the locking member also coincide with the radial center line passing through the geometric center of the bearing 23, so that contact point 1 221 and contact point 281 can be symmetrically arranged at both ends of the bearing 23 and located in the middle of the bearing 23.

[0051] By adjusting and fixing the position of the locking element, the squeezing force it applies to the outer ring of the bearing 23 at contact point 281 can be changed, thereby adjusting the flexibility of the bearing 23 rotation and changing the relative motion between the trowel element 22 and the surface of part 1.

[0052] Example 3

[0053] In another preferred embodiment of the present invention, the present invention includes a burnishing knife, comprising a handle 21, a burnishing element 22, a bearing 23, a mounting member, and a locking member. The handle 21 is provided with a mounting hole 213 that matches the burnishing element 22, and the burnishing element 22 is rotatably disposed within the mounting hole 213. The burnishing element 22 may be spherical. Furthermore, to prevent the burnishing element 22 from falling out, a retaining ring 211 is provided around the periphery of the mounting hole 213 and on the side away from the bearing 23.

[0054] The tool holder 21 is also provided with a receiving cavity and a through hole, and the mounting hole 213, the receiving cavity, and the through hole are connected in sequence. The bearing 23 is rotatably mounted in the receiving cavity by a mounting component. After installation, the outer ring of the bearing 23 contacts the burnishing element 22, forming contact point one 221. Specifically, the mounting component includes a support shaft 24, a limiting ring 25, a washer 26, and a screw 27. The bearing 23 and the limiting ring 25 are sequentially mounted on the support shaft 24, and the screw 27 passes through the washer 26 and is screwed into the support shaft 24. The locking component is located in the through hole and can contact the outer ring of the bearing 23, forming contact point two 281. Specifically, the through hole is a threaded hole 212, and the locking component is a clamping screw 28 that matches the threaded hole 212. By adjusting and fixing the position of the locking component, the compressive force it applies to the outer ring of the bearing 23 at contact point two 281 can be changed, thereby adjusting the flexibility of the bearing 23's rotation and changing the relative motion between the burnishing element 22 and the surface of part 1.

[0055] Example 4

[0056] In another preferred embodiment of the present invention, the present invention includes a burnishing knife, comprising a handle 21, a burnishing element 22, a bearing 23, a mounting component, and a locking component. The handle 21 is provided with a mounting hole 213 that matches the burnishing element 22, and the burnishing element 22 is rotatably disposed within the mounting hole 213. For details, please refer to the appendix to the specification. Figure 12The burnishing element 22 is cylindrical, and the mounting hole 213 is rectangular. The diameter of the burnishing element 22 can be 3mm to 5mm, which is a small-size design. The burnishing element 22 has line contact with the surface of part 1, which can achieve the purpose of low burnishing pressure under a certain burnishing pressure. Compared with the large-size burnishing rollers (with a roller diameter of about 20mm) currently popular in the market, its operating pressure is much lower. Furthermore, since the burnishing element 22 has a cylindrical structure, the burnishing efficiency can be improved. Also, refer to the attached manual. Figure 13 Included with instruction manual Figure 14 In order to reduce the friction between the cylindrical polishing element 22 and the mounting hole 213, the two ends of the cylindrical polishing element 22 can be designed as spherical bulges. In this way, the cylindrical polishing element 22 and the mounting hole 213 form two line contacts and two point contacts, which can significantly reduce the friction between them.

[0057] The tool holder 21 is also provided with a receiving cavity and a through hole, and the mounting hole 213, the receiving cavity, and the through hole are connected in sequence. The bearing 23 is rotatably mounted in the receiving cavity by a mounting component. After installation, the outer ring of the bearing 23 contacts the burnishing element 22, forming contact point one 221. The locking component is disposed in the through hole and can contact the outer ring of the bearing 23, forming contact point two 281. By adjusting and fixing the position of the locking component, the squeezing force it applies to the outer ring of the bearing 23 at contact point two 281 can be changed, thereby adjusting the flexibility of the bearing 23 rotation and changing the relative motion between the burnishing element 22 and the surface of part 1.

[0058] Example 5

[0059] In the preferred embodiment of the present invention, the present invention includes a burnishing knife, comprising a handle 21, a burnishing element 22, a bearing 23, a mounting component, and a locking component. The handle 21 is provided with a mounting hole 213 that matches the burnishing element 22, and the burnishing element 22 is rotatably disposed within the mounting hole 213. For details, please refer to the appendix to the specification. Figure 8 The tumbling element 22 is spherical. A retaining ring 211 is provided around the mounting hole 213 to prevent the tumbling element 22 from falling out. (Refer to the attached instruction manual.) Figure 9 ~Refer to the attached instruction manual Figure 10Because there is a certain gap between the burnishing element 22 and the mounting hole 213, there is a micro-gap in the semi-circular range on the same side as the feed direction during operation. During the burnishing process, the burnishing element 22 is subjected to the extrusion force F transmitted from the burnishing surface of part 1. Under the action of F, the burnishing element 22 makes line contact with the hole wall of the mounting hole 213 after passing through the highest point of the burnishing element 22. In the actual burnishing process, the maximum range of the line contact angle is 180°, and the direction of the line contact part is opposite to the feed direction. The highest point on the right side of the burnishing element 22 makes point contact with the outer ring of the bearing 23. The line contact and point contact greatly reduce the rolling friction resistance of the burnishing element 22, enabling it to rotate flexibly and reducing wear, making it durable.

[0060] The diameter of the tumbling element 22 can be 3mm to 5mm, which is a small-size design that allows for low tumbling pressure under a certain tumbling pressure. Compared with the large-size roller tumbling knives currently popular on the market (the roller diameter is about 20mm), its operating pressure is much lower.

[0061] Furthermore, since the burnishing element 22 is the core component for burnishing, the selection of its material is crucial. Different materials of burnishing element 22 must be selected according to the different materials of part 1 to achieve the best effect. At the same time, since the burnishing element 22 and the mounting hole 213 are in sliding contact (line contact), the material of the tool holder 21 should be selected with good strength and wear resistance. In addition, the mounting hole 213 of the burnishing element 22 needs to be surface strengthened to ensure high durability.

[0062] Refer to the instruction manual appendix Figure 1 ~Refer to the attached instruction manual Figure 7 The tool holder 21 is also provided with a receiving cavity and a through hole, and the mounting hole 213, the receiving cavity, and the through hole are connected in sequence. The bearing 23 is rotatably mounted in the receiving cavity by a mounting component. Specifically, the mounting component includes a support shaft 24, a limiting ring 25, a washer 26, and a screw 27. The receiving cavity includes a bearing mounting groove and a support shaft mounting hole. The bearing 23 and the limiting ring 25 are sequentially mounted on the support shaft 24, and the screw 27 passes through the washer 26 and is screwed into the support shaft 24. Through the mutual cooperation of the components in this mounting component, the bearing 23 can be installed and its position fixed on the tool holder 21. After installation, the outer ring of the bearing 23 contacts the surface of the burnishing element 22, forming contact point 221.

[0063] The through hole is a threaded hole 212, and the locking element is a clamping screw 28 that matches the threaded hole 212. The end of the clamping screw 28 near the bearing 23 is round-headed. The clamping screw 28 is disposed in the threaded hole 212. By adjusting the position of the clamping screw 28, the round-headed end face of the clamping screw 28 can be made to contact the outer ring of the bearing 23, forming contact point 281.

[0064] Preferably, the central axes of the burnishing element 22 and the locking member are collinear and perpendicular to the central axis of the bearing 23. Further, the central axes of the burnishing element 22 and the locking member coincide with the radial centerline passing through the geometric center of the bearing 23. This positional limitation allows contact point one 221 and contact point two 281 to be symmetrically arranged at both ends of the bearing 23, and located in the middle of the bearing 23.

[0065] Further, please refer to the appendix to the instruction manual. Figure 15 Included with instruction manual Figure 16 In this embodiment, the shape of the tool holder 21 can be changed to cope with the burnishing of outer shaft surface, inner hole surface, conical surface, etc., which simplifies and speeds up the application scenarios of burnishing and can meet the burnishing of various specific morphological features.

[0066] The assembly method of the burnishing cutter 2 includes:

[0067] The first step is to install the burnishing element 22 into the corresponding mounting hole 213 of the tool holder 21;

[0068] The second step is to place the bearing 23 into the bearing mounting groove of the tool holder 21, and at the same time install the support shaft 24 into the support shaft mounting hole of the tool holder 21, and coordinate the positional relationship between the bearing 23 and the support shaft 24 so that the support shaft 24 passes through the inner hole of the bearing 23.

[0069] The third step is to install the limiting ring 25 onto the support shaft 24;

[0070] Fourth step, put the washer 26 into the screw 27, screw the screw 27 into the internal thread hole 212 of the support shaft 24, and tighten the screw 27.

[0071] Fifth step, install the clamping screw 28 into the threaded hole 212, and adjust the position of the clamping screw 28 until it is in light contact with the outer ring of the bearing 23.

[0072] At this point, the burnishing cutter 2 is assembled. It can be clamped onto the machine tool and aligned for burnishing. During processing, the tightness of the clamping screw 28 can be adjusted according to the actual situation to control the burnishing effect of the burnishing element 22. For details, please refer to the attached instruction manual. Figure 11This can change the squeezing force applied by the clamping screw 28 to the outer ring of the bearing 23 at contact point 281, thereby adjusting the flexibility of the bearing 23's rotation and changing the relative motion between the burnishing element 22 and the surface of part 1. During burnishing, part 1 drives the burnishing element 22 to rotate, which in turn drives the outer ring of the bearing 23 to rotate. Sliding friction occurs between the outer ring of the bearing 23 and the clamping screw 28 at contact point 281. By adjusting the position of the clamping screw 28, the compressive force at contact point 281 can be increased or decreased, thereby affecting the starting torque of the outer ring of bearing 23 and consequently the frictional force at contact point 221. When the compressive force at contact point 281 is large enough, the outer ring of bearing 23 remains stationary, and the rolling element 22 and the outer ring of bearing 23 slide relative to each other at contact point 221, generating sliding friction. When the compressive force at contact point 281 is moderate, the outer ring of bearing 23 can rotate, but not very flexibly, and the rolling element 22 and the outer ring of bearing 23 are in a state of both rolling and sliding at contact point 221, i.e., a mixed state of sliding friction and rolling friction. When the clamping screw 28 disengages from the outer ring of bearing 23, bearing 23 can rotate flexibly, and the rolling element 22 and the outer ring of bearing 23 roll relative to each other at contact point 221, generating rolling friction.

[0073] Therefore, by adjusting the clamping force of the clamping screw 28, the rotational flexibility of the burnishing element 22 can be controlled, thereby indirectly controlling the frictional state of the contact point 222 between the part and the burnishing element. This allows the burnishing ball to switch between three states on the surface of part 1 during burnishing: "completely rolling," "both rolling and sliding," and "completely sliding." In the "both rolling and sliding" state, the ratio of rolling to sliding speed can be adjusted by changing the clamping force of the clamping screw 28. The surface finishing effect produced by these three states varies depending on the material. For example, in the surface finishing of titanium alloys, the surface finishing effect of "completely rolling" and "both rolling and sliding" is better than "completely sliding." How to adjust the tool for a specific material needs to be tested in practice to find the optimal state.

[0074] Therefore, the aforementioned burnishing cutter 2 can achieve burnishing of both high-hardness (alloy steel) parts 1 and high-toughness (titanium alloy) parts 1. Furthermore, practical experience has shown that this design can achieve a surface roughness of Ra0.2 after burnishing of parts 1 with good toughness, such as titanium alloys.

[0075] Example 6

[0076] In another preferred embodiment of the present invention, the present invention includes a method for using a burnishing cutter, which can be implemented based on the burnishing cutter 2 described in any of embodiments 1 to 5. Specifically, during burnishing, part 1 drives the burnishing element 22 to rotate, and the burnishing element 22 drives the outer ring of bearing 23 to rotate. The outer ring of bearing 23 and the locking member generate sliding friction at contact point 281. By adjusting the position and tightness of the locking member, the rotational flexibility of the outer ring of bearing 23 can be adjusted, thereby affecting the rotational flexibility of the burnishing element 22, and ultimately affecting the relative motion between the burnishing element 22 and the surface of part 1 to be burnished. Therefore, when burnishing is required, adjusting the position of the locking member further adjusts the squeezing force applied by the locking member to the outer ring of bearing 23 at contact point 281: when the squeezing force is large enough, the outer ring of bearing 23 is locked, and the burnishing element 22 and the surface of part 1 are in a purely sliding running state. When the squeezing force is moderate, the outer ring of bearing 23 can rotate, but cannot rotate flexibly, and the burnishing element 22 and the surface of part 1 are in a mixed sliding and rolling motion state. When the locking element does not contact the outer ring of the bearing 23, the outer ring of the bearing 23 rotates flexibly, and the tumbler element 22 and the surface of part 1 are in a pure rolling motion state.

[0077] Furthermore, when performing high-precision burnishing on the surface of part 1, the burnishing element 22 of the burnishing cutter 2 can be controlled to contact the surface of part 1 to be burnished by programming the burnishing process. The pressure between the burnishing element 22 and the surface of part 1 to be burnished can be adjusted by adjusting the parameter values ​​of the program. During burnishing, the burnishing cutter 2 is mounted on the turret of a turning machining center. The machine tool is started, and the machine tool spindle drives part 1 to roll. The burnishing cutter 2 is then controlled by the program to move on the surface of part 1, so that it performs burnishing on the surface of part 1 to be burnished (the "burnishing cutter 2" can be compared to the "turning tool" in turning). After burnishing, the surface roughness can be significantly improved.

[0078] In summary, any other corresponding modifications made by those skilled in the art after reading this invention document, without requiring creative mental effort, based on the technical solutions and concepts of this invention, are all within the scope of protection of this invention.

Claims

1. A burnishing knife, comprising a handle (21) and a burnishing element (22), wherein the handle (21) is provided with a mounting hole (213) matching the burnishing element (22), and the burnishing element (22) is rotatably disposed within the mounting hole (213), characterized in that: It also includes a bearing (23), a mounting component, and a locking component; the tool holder (21) is also provided with a receiving cavity and a through hole, and the mounting hole (213), the receiving cavity, and the through hole are connected in sequence; the bearing (23) is rotatably installed in the receiving cavity through the mounting component, and the outer ring of the installed bearing (23) contacts the burnishing element (22) to form a contact point one (221); the locking component is set in the through hole and can contact the outer ring of the bearing (23) to form a contact point two (281); by adjusting and fixing the position of the locking component, the squeezing force it applies to the outer ring of the bearing (23) at the contact point two (281) can be changed, the flexibility of the rotation of the outer ring of the bearing (23) can be adjusted, and the relative motion form between the burnishing element (22) and the surface of the part (1) can be changed; When burnishing is required, adjust the position of the locking part and further adjust the squeezing force applied by the locking part to the outer ring of the bearing (23) at contact point two (281): when the squeezing force is large enough, the outer ring of the bearing (23) is locked, and the burnishing element (22) and the surface of the part (1) are in a pure sliding running state; when the squeezing force is moderate, the outer ring of the bearing (23) can rotate, but cannot rotate flexibly, and the burnishing element (22) and the surface of the part (1) are in a mixed sliding and rolling motion state; when the locking part does not contact the outer ring of the bearing (23), the outer ring of the bearing (23) rotates flexibly, and the burnishing element (22) and the surface of the part (1) are in a pure rolling motion state.

2. The burnishing knife according to claim 1, characterized in that: The central axes of the troweling element (22) and the locking element are collinear and perpendicular to the central axis of the bearing (23).

3. A burnishing knife according to claim 2, characterized in that: The central axis of the trowel element (22) and the locking element coincides with the radial centerline of the geometric center of the through bearing (23).

4. A burnishing knife according to claim 1, characterized in that: The mounting components include a support shaft (24), a limiting ring (25), a washer (26), and a screw (27). The bearing (23) and the limiting ring (25) are installed on the support shaft (24) in sequence, and the screw (27) passes through the washer (26) and is screwed into the support shaft (24).

5. A burnishing knife according to claim 1, characterized in that: The through hole is a threaded hole (212), and the locking element is a clamping screw (28) that matches the threaded hole (212).

6. A burnishing knife according to claim 5, characterized in that: The end of the clamping screw (28) near the bearing (23) is rounded.

7. A burnishing knife according to claim 1, characterized in that: The mounting hole (213) is surrounded by a sealing ring (211) to prevent the tumbler element (22) from falling off.

8. A burnishing knife according to claim 1, characterized in that: The calendering element (22) is spherical or cylindrical.

9. A burnishing knife according to claim 8, characterized in that: When the burnishing element (22) is cylindrical, the two end faces are spherical bulges, and the burnishing element (22) and the mounting hole (213) form two line contacts and two point contacts.

10. A burnishing knife according to claim 8, characterized in that: The diameter of the calendering element (22) is 3mm to 5mm.

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