Tumbling cutter and using method thereof

Abstract

The invention relates to the technical field of part machining, in particular to a tumbling cutter and a using method thereof.The tumbling cutter comprises a cutter handle, a tumbling element, a bearing, a mounting piece and a locking piece, the cutter handle is provided with a mounting hole matched with the tumbling element, the tumbling element is rotationally arranged in the mounting hole, the cutter handle is further provided with a containing cavity and a through hole, and the bearing is arranged in the containing cavity; the mounting hole, the accommodating cavity and the through hole are sequentially communicated; the bearing is rotationally installed in the containing cavity through an installation piece, and the outer ring of the installed bearing makes contact with the tumbling element to form a first contact point. The locking piece is arranged in the through hole and can be in contact with the bearing outer ring to form a contact point II; by adjusting and fixing the position of the locking piece, the extrusion force applied to the outer ring of the bearing at the second contact point is changed, the rotation flexibility of the bearing can be adjusted, and the relative movement form of the tumbling element and the surface of the part is changed. After high-toughness materials such as titanium alloy are subjected to tumbling processing through the tumbling cutter, the requirement that the surface roughness reaches Ra0.2 can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of parts processing, in particular to a roller burnishing cutter and a use method thereof. Background Art

[0002] The assembly surfaces of turned parts, such as critical aircraft components and hydraulic system piping connectors, require functional requirements such as movement and sealing. Surface roughness requirements for these parts must reach Ra0.2 or higher. Traditional turning processes can only achieve a maximum of Ra0.8, and achieving a roughness of Ra0.2 requires finishing. During finishing, the most critical influence on roughness is the roller burnishing tool. Currently, the mainstream roller burnishing tools are ball-end and wheel-end tools. The motion between the tool head and the surface of the part being burnished is either pure rolling or pure sliding, with no intermediate state between rolling and sliding possible.

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

[0004] In actual use, that is, when facing the surface finishing of parts with good toughness such as titanium alloy, the above-mentioned purely sliding ball-end roller burnishing cutter and purely rolling roller burnishing cutter cannot achieve the surface roughness requirement of Ra0.2 after finishing. Summary of the Invention

[0005] In order to solve the above technical problems, the present invention proposes a roller burnishing cutter and a method for using the same. After the roller burnishing cutter is used to burnish high-toughness materials such as titanium alloy, the surface roughness can reach the requirement of Ra0.2.

[0006] The present invention is achieved by adopting the following technical solutions: A rolling cutter comprises a shank, a rolling element, a bearing, a mounting piece and a locking piece, wherein the shank is provided with a mounting hole matching the rolling element, and the rolling element is rotatably arranged in the mounting hole; the shank is also provided with a accommodating cavity and a through hole, and the mounting hole, the accommodating cavity and the through hole are sequentially connected; the bearing is rotatably mounted in the accommodating cavity via the mounting piece, and the outer ring of the bearing after installation contacts the rolling element to form contact point one; the locking piece is arranged in the through hole and can contact the outer ring of the bearing to form contact point two; by adjusting and fixing the position of the locking piece and changing the extrusion force applied to the outer ring of the bearing at contact point two, the flexibility of the rotation of the outer ring of the bearing can be adjusted, and the relative motion form of the rolling element and the surface of the part can be changed.

[0007] The central axes of the rolling element and the locking element are collinear and perpendicular to the central axis of the bearing.

[0008] The central axes of the rolling element and the locking element coincide with the radial center line passing through the geometric center of the bearing.

[0009] The mounting member comprises a support shaft, a limiting ring, a gasket and a screw. The bearing and the limiting ring are sequentially mounted on the support shaft. The screw passes through the gasket and is screwed into the support shaft.

[0010] The through hole is a threaded hole, and the locking piece is a compression screw matching the threaded hole.

[0011] The end portion of the pressing screw close to one end of the bearing is in a round head shape.

[0012] A closing ring is provided around the mounting hole to prevent the roller burnishing element from falling.

[0013] The rolling element is spherical or cylindrical.

[0014] When the roller burnishing element is cylindrical, the two end surfaces are spherical bulges, and two line contacts and two point contacts are formed between the roller burnishing element and the mounting hole.

[0015] The diameter of the roller burnishing element is 3mm~5mm.

[0016] According to the above-mentioned method of using the roller burnishing knife, when roller burnishing is required, the position of the locking part is adjusted, and the extrusion pressure applied by the locking part to the outer ring of the bearing at the second contact point is further adjusted: when the extrusion pressure is large enough, the outer ring of the bearing is locked, and the roller burnishing element and the surface of the part are in a pure sliding operation state; when the extrusion pressure is moderate, the outer ring of the bearing can rotate, but cannot rotate flexibly, and the roller 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 roller burnishing element and the surface of the part are in a pure rolling motion state.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention's roller burnishing cutter can achieve "pure sliding," "mixed sliding and rolling," or "pure rolling" motions by adjusting the relative motion between the burnishing element and the part surface during processing, thereby meeting the requirements for improving the surface roughness of different materials. Practical verification has shown that despite its simple structure, this roller burnishing cutter design overcomes the problem that conventional roller burnishing tools relying on pure sliding or pure rolling cannot significantly improve the surface roughness of highly elastic materials such as titanium alloys, achieving surface roughness requirements of up to Ra0.2.

[0018] 2. The roller burnishing cutter of the present invention has a wide range of applications and good rolling effect. It is mainly used for high-precision surface finishing of parts with sealing requirements such as hydraulic system pipe connectors. It can significantly improve the surface roughness of parts and increase the surface compressive stress of parts, thereby improving the sealing performance and product service life.

[0019] 3. The core structure of the roller burnishing cutter of the present invention is compact. By changing the shape of the roller burnishing element (from spherical to cylindrical), changing the structure style of the tool handle, etc., the roller burnishing efficiency of the tool can be further improved and its scope of use can be expanded, so that it can be used for finishing processing of various morphological features such as external shaft surfaces, internal hole surfaces, and conical surfaces. It has the characteristics of strong versatility and applicability.

[0020] 4. Through the structural design of the roller burnishing cutter, the roller burnishing element of the roller burnishing cutter can be designed in small size, and the surface burnishing effect of the part can be achieved under a smaller extrusion pressure, which can not only realize the roller burnishing processing of weak rigid parts, but also improve the durability of the tool.

[0021] 5. In the present invention, the central axes of the rolling element and the locking member are collinear and perpendicular to the central axis of the bearing. Furthermore, the central axes of the rolling element and the locking member 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. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments, wherein: Figure 1 An exploded view of the roller burnishing cutter of the present invention; Figure 2 This is an assembly diagram of the roller burnishing cutter in the present invention; Figure 3 This is an axonometric view of the roller burnishing cutter of the present invention when in use; Figure 4 Schematic diagram of the planar structure of the roller burnishing cutter in the present invention; Figure 5 Schematic diagram of the cross-sectional structure of AA in the present invention; Figure 6It is a cross-sectional view of the exploded structure of AA in the present invention; Figure 7 Schematic diagram of the cross-sectional structure of BB in the present invention; Figure 8 This is an enlarged schematic diagram of region C in the present invention; Figure 9 Schematic diagram of the force analysis of the rolling element of the rolling knife in the present invention Figure 1 ; Figure 10 Schematic diagram of the force analysis of the rolling element of the rolling knife in the present invention Figure 2 ; Figure 11 A cross-sectional view of the roller burnishing cutter in the present invention; Figure 12 An isometric view of a roller burnishing cutter including a cylindrical roller burnishing element according to the present invention; Figure 13 A partial enlarged view of the assembly position of the cylindrical roller burnishing element in the present invention; Figure 14 Schematic diagram of the structure of the cylindrical roller burnishing element in the present invention; Figure 15 Schematic diagram of the roller burnishing process of the right-angle roller burnishing tool in the present invention Figure 1 ; Figure 16 Schematic diagram of the roller burnishing process of the right-angle roller burnishing tool in the present invention Figure 2 ; Markings in the figure: 1. Parts, 2. Rolling cutter, 21. Tool handle, 22. Rolling element, 23. Bearing, 24. Support shaft, 25. Limiting ring, 26. Gasket, 27. Screw 27, 28. Pressing screw 27, 211. Closing ring, 212. Threaded hole, 213. Mounting hole, 221. Contact point one, 222. Contact point between part and rolling element, 281. Contact point two. DETAILED DESCRIPTION

[0023] Example 1 As a basic embodiment of the present invention, the present invention includes a rolling knife, including a shank 21, a rolling element 22, a bearing 23, a mounting member, and a locking member. The shank 21 is provided with a mounting hole 213 that matches the rolling element 22, and the rolling element 22 is rotatably mounted in the mounting hole 213. The shank 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 the mounting member, and the outer ring of the bearing 23 after installation contacts the rolling element 22 to form a contact point 221. The structure of the mounting member can adopt conventional technical means in this field, for example, it can include a central shaft and a locking nut, etc. 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 to prevent the central shaft from loosening during use.

[0024] The locking member is disposed within the through hole and can be adjusted in position to allow the locking member to contact or not contact the outer ring of bearing 23, forming contact point 281 when in contact. The locking member can utilize conventional techniques in the art, such as an adjustment screw or a positioning pin, and can be provided with a corresponding locking mechanism to achieve locking. Specifically, this can be achieved using a lock nut, self-locking threads, or a locking pin.

[0025] By adjusting and fixing the position of the locking part and changing the extrusion force applied to the outer ring of the bearing 23 at the second contact point 281, the flexibility of the rotation of the outer ring of the bearing 23 can be adjusted, thereby changing the relative movement form of the rolling element 22 and the surface of the part 1, so that during the rolling process, the state of the rolling element 22 on the surface of the part 1 can be switched between three states: "complete rolling", "both rolling and sliding", and "complete sliding".

[0026] Example 2 As a preferred embodiment of the present invention, a roller burnishing knife comprises a handle 21, a roller burnishing element 22, a bearing 23, a mounting member, and a locking member. In this embodiment, the roller burnishing element 22 can be spherical. The handle 21 is provided with a mounting hole 213 that matches the roller burnishing element 22, and the roller burnishing element 22 is rotatably mounted within the mounting hole 213.

[0027] The handle 21 also includes a receiving cavity and a through-hole. The mounting hole 213, the receiving cavity, and the through-hole are sequentially connected. The bearing 23 is rotatably mounted within the receiving cavity via a mounting member. Once mounted, the outer ring of the bearing 23 contacts the roller-brightening element 22, forming a first contact point 221. The locking member is disposed within the through-hole and is capable of contacting the outer ring of the bearing 23, forming a second contact point 281.

[0028] The central axes of the roller-smoothing element 22 and the locking member are collinear and perpendicular to the central axis of the bearing 23. Preferably, the central axes of the roller-smoothing element 22 and the locking member also coincide with a radial centerline passing through the geometric center of the bearing 23, so that the first contact point 221 and the second contact point 281 can be symmetrically arranged at both ends of the bearing 23 and located in the middle of the bearing 23.

[0029] By adjusting and fixing the position of the locking member and changing the extrusion force applied to the outer ring of the bearing 23 at the second contact point 281, the rotation flexibility of the bearing 23 can be adjusted and the relative movement form between the roller burnishing element 22 and the surface of the part 1 can be changed.

[0030] Example 3 Another preferred embodiment of the present invention includes a roller burnishing cutter comprising a handle 21, a roller burnishing element 22, a bearing 23, a mounting member, and a locking member. The handle 21 is provided with a mounting hole 213 that mates with the roller burnishing element 22. The roller burnishing element 22 is rotatably mounted within the mounting hole 213. The roller burnishing element 22 can be spherical. Furthermore, to prevent the roller burnishing element 22 from falling, a closing ring 211 is provided around the mounting hole 213, away from the bearing 23.

[0031] The tool handle 21 is also provided with a receiving cavity and a through-hole. The mounting hole 213, the receiving cavity, and the through-hole are sequentially connected. The bearing 23 is rotatably mounted within the receiving cavity via a mounting member. After installation, the outer ring of the bearing 23 contacts the roller burnishing element 22, forming a first contact point 221. Specifically, the mounting member comprises a support shaft 24, a retaining ring 25, a gasket 26, and a screw 27. The bearing 23 and retaining ring 25 are sequentially mounted on the support shaft 24. The screw 27 passes through the gasket 26 and is screwed into the support shaft 24. The locking member is disposed within the through-hole and is capable of contacting the outer ring of the bearing 23, forming a second contact point 281. Specifically, the through-hole is a threaded hole 212, and the locking member is a compression screw 28 that matches the threaded hole 212. By adjusting and fixing the position of the locking member and varying the compressive force it exerts on the outer ring of the bearing 23 at the second contact point 281, the rotational flexibility of the bearing 23 can be adjusted, thereby changing the relative motion between the roller burnishing element 22 and the surface of the part 1.

[0032] Example 4 As another preferred embodiment of the present invention, the present invention includes a roller burnishing knife, including a handle 21, a roller 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 roller burnishing element 22, and the roller burnishing element 22 is rotatably mounted in the mounting hole 213. Figure 12, the rolling element 22 is cylindrical, and the mounting hole 213 is a rectangular hole. The diameter of the rolling element 22 can be 3mm~5mm, which is a small-size design. The rolling element 22 is in line contact with the surface of the part 1, which can achieve the purpose of low rolling pressure under a certain rolling pressure. Compared with the large-size roller burnishing cutter currently popular on the market (the roller diameter is about 20mm), its use pressure is much smaller. In addition, since the rolling element 22 is a cylindrical structure, the efficiency of the rolling process can be improved. At the same time, refer to the attached manual Figure 13 and instructions attached Figure 14 In order to reduce the friction between the cylindrical roller element 22 and the mounting hole 213, the two end faces of the cylindrical roller element 22 can be designed to be spherical bulges, so that two line contacts and two point contacts are formed between the cylindrical roller element 22 and the mounting hole 213, which can significantly reduce the friction between them.

[0033] The tool handle 21 is also provided with a receiving cavity and a through-hole. The mounting hole 213, the receiving cavity, and the through-hole are sequentially connected. The bearing 23 is rotatably mounted within the receiving cavity via a mounting member. Once mounted, the outer ring of the bearing 23 contacts the roller burnishing element 22, forming contact point 1 221. A locking member is disposed within the through-hole and is capable of contacting the outer ring of the bearing 23, forming contact point 281. By adjusting and fixing the position of the locking member and varying the compressive force applied to the outer ring of the bearing 23 at contact point 281, the rotational flexibility of the bearing 23 can be adjusted, thereby varying the relative motion between the roller burnishing element 22 and the surface of the part 1.

[0034] Example 5 As the best embodiment of the present invention, the present invention includes a roller burnishing knife, including a handle 21, a roller 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 roller burnishing element 22, and the roller burnishing element 22 is rotatably mounted in the mounting hole 213. Figure 8 The roller light element 22 is spherical. A closing ring 211 is provided around the mounting hole 213 to prevent the roller light element 22 from falling. Figure 9 ~ Refer to the instruction manual Figure 10Because there's a certain gap between the roller burnishing element 22 and the mounting hole 213, a slight gap exists within the semicircle on the same side as the feed direction during operation. During the rolling process, the roller burnishing element 22 is subjected to the extrusion force F transmitted from the burnished surface of the part 1. Under the action of F, a circle of the roller burnishing element 22, passing through the highest points of the roller burnishing element 22, contacts the wall of the mounting hole 213, forming a line contact. During the actual rolling process, the line contact angle range is up to 180°, and the direction of the line contact portion is opposite to the feed direction. The highest point on the right side of the roller burnishing element 22 contacts the outer ring of the bearing 23, forming a point contact. The line contact and point contact greatly reduce the rolling friction resistance of the roller burnishing element 22, allowing it to rotate flexibly and reducing wear, making it durable.

[0035] The roller burnishing element 22 can have a diameter of 3mm to 5mm, a small design that allows for low roller burnishing pressure at a constant pressure. Compared to the currently popular large roller burnishing blades (with a roller diameter of approximately 20mm), the operating pressure is much lower.

[0036] Furthermore, since the polishing element 22 is the core component for rolling, the selection of its material is very critical. According to the different materials of the part 1, it is necessary to select polishing elements 22 of different materials to achieve the best effect. At the same time, since the polishing element 22 and the mounting hole 213 are in sliding contact (line contact), the material of the shank 21 is selected to have good strength and wear resistance. At the same time, the surface of the mounting hole 213 of the polishing element 22 needs to be strengthened to ensure high durability.

[0037] Refer to the instruction manual Figure 1 ~ Refer to the instruction manual Figure 7 , the shank 21 is also provided with a accommodating cavity and a through hole, and the mounting hole 213, the accommodating cavity and the through hole are connected in sequence. The bearing 23 is rotatably mounted in the accommodating cavity through a mounting member. Specifically, the mounting member includes a support shaft 24, a limiting ring 25, a gasket 26 and a screw 27. The accommodating 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 gasket 26 and is screwed into the support shaft 24. Through the mutual cooperation of the various components in the mounting member, the bearing 23 can be installed and fixed in position on the shank 21. After installation, the outer ring of the bearing 23 contacts the surface of the roller element 22 to form a contact point 221.

[0038] The through hole is a threaded hole 212, and the locking member is a compression screw 28 that matches the threaded hole 212. The end of the compression screw 28, which is adjacent to the bearing 23, is round-headed. The compression screw 28 is positioned within the threaded hole 212. By adjusting the position of the compression screw 28, the round-headed end surface of the compression screw 28 can be brought into contact with the outer race of the bearing 23, forming a second contact point 281.

[0039] Preferably, the central axes of the roller element 22 and the locking member are collinear and perpendicular to the central axis of the bearing 23. Furthermore, the central axes of the roller element 22 and the locking member coincide with a radial centerline passing through the geometric center of the bearing 23. This positional constraint allows contact point 1 221 and contact point 281 to be symmetrically positioned at both ends of the bearing 23, located in the middle of the bearing 23.

[0040] Further, refer to the instructions attached Figure 15 and instructions attached Figure 16 In this embodiment, the shape of the tool handle 21 can be changed to cope with the roller burnishing processing of the outer shaft surface, the inner hole surface, the conical surface, etc., which simply and quickly broadens the application scenarios of the roller burnishing processing and can meet the roller burnishing processing of various specific morphological characteristics.

[0041] The assembly method of the roller burnishing cutter 2 includes: The first step is to install the roller burnishing element 22 into the corresponding mounting hole 213 of the tool handle 21; The second step is to place the bearing 23 into the bearing mounting groove of the shank 21, and at the same time install the support shaft 24 into the support shaft mounting hole of the shank 21, coordinate the positional relationship between the bearing 23 and the support shaft 24, and make the support shaft 24 pass through the inner hole of the bearing 23; The third step is to install the limiting ring 25 onto the support shaft 24; In the fourth step, the washer 26 is placed on the screw 27 , and the screw 27 is screwed into the internal threaded hole 212 of the support shaft 24 , and the screw 27 is tightened.

[0042] Step 5: Install the clamping screw 28 into the threaded hole 212 and adjust the position of the clamping screw 28 until it lightly contacts the outer ring of the bearing 23.

[0043] At this point, the roller burnishing cutter 2 is assembled and can be clamped to the machine tool and then aligned for roller burnishing. During the processing, the tightness of the clamping screw 28 can be adjusted according to the actual situation to control the roller burnishing effect of the roller burnishing element 22. Figure 11This can change the squeezing force applied by the clamping screw 28 on the outer ring of the bearing 23 at the second contact point 281, thereby adjusting the rotational flexibility of the bearing 23 and altering the relative motion between the roller burnishing element 22 and the surface of the part 1. During the roller burnishing process, the part 1 rotates the roller burnishing element 22, which in turn rotates the outer ring of the bearing 23. Sliding friction occurs between the outer ring of the bearing 23 and the clamping screw 28 at the second contact point 281. By adjusting the position of the clamping screw 28, the squeezing force at the second contact point 281 can be increased or decreased, thereby affecting the starting torque for the rotation of the outer ring of the bearing 23, and further affecting the friction form at the first contact point 221. When the squeezing force at the second contact point 281 is large enough and the outer ring of the bearing 23 is stationary, the roller element 22 and the outer ring of the bearing 23 slide relative to each other at the first contact point 221, generating sliding friction; when the squeezing force at the second contact point 281 is moderate and the outer ring of the bearing 23 can rotate but is not very flexible, the roller element 22 and the outer ring of the bearing 23 are in a state of both rolling and sliding at the first contact point 221, that is, a mixed state of sliding friction and rolling friction; when the clamping screw 28 is out of contact with the outer ring of the bearing 23 and the bearing 23 can rotate flexibly, the roller element 22 and the outer ring of the bearing 23 roll relative to each other at the first contact point 221, generating rolling friction.

[0044] 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 friction state of the contact point 222 between the part and the burnishing element, and the state of the burnishing beads on the surface of the part 1 during the burnishing process can be switched between the three states of "complete rolling", "both rolling and sliding", and "complete sliding". Among them, in the state of "both rolling and sliding", the proportion of rolling and sliding speeds can be adjusted by adjusting the clamping force of the clamping screw 28. The surface finishing effects produced by the three states for different materials are inconsistent. For example, in the surface finishing of titanium alloys, the surface finishing effects of "complete rolling" and "both rolling and sliding" are better than "complete sliding". How to adjust the tool for specific materials needs to be tried in practice in order to find the best state.

[0045] Therefore, the roller burnishing cutter 2 can achieve both high-hardness (alloy steel) parts 1 and high-toughness (titanium alloy) parts 1. In practice, it has been found that this design can achieve a surface roughness of Ra0.2 after roller burnishing of parts 1 with good toughness, such as titanium alloys.

[0046] Example 6 As another preferred embodiment of the present invention, the present invention includes a method for using a roller burnishing tool. This method can be implemented based on the roller burnishing tool 2 described in any of Examples 1 to 5. Specifically, during roller burnishing, part 1 drives roller burnishing element 22 to rotate, which in turn drives the outer ring of bearing 23 to rotate. Sliding friction occurs between the outer ring of bearing 23 and the locking element at contact point 281. Adjusting the position and tightness of the locking element adjusts the rotational flexibility of the outer ring of bearing 23, thereby affecting the rotational flexibility of roller burnishing element 22 and, ultimately, the relative motion between roller burnishing element 22 and the surface of part 1 being roller burnished. Therefore, when roller burnishing is required, the position of the locking element is adjusted, and the compressive force applied by the locking element to the outer ring of bearing 23 at contact point 281 is further adjusted. When the compressive force is sufficiently high, the outer ring of bearing 23 is locked, and roller burnishing element 22 and the surface of part 1 operate in a purely sliding state. When the compressive force is moderate, the outer ring of bearing 23 can rotate but not flexibly, and roller burnishing element 22 and the surface of part 1 experience a mixed sliding and rolling motion. When the locking member is not in contact with the outer ring of the bearing 23, the outer ring of the bearing 23 rotates flexibly, and the rolling element 22 and the surface of the part 1 are in a pure rolling motion state.

[0047] Furthermore, when performing roller burnishing on the high-precision surface of part 1, a roller burnishing program can be compiled to control the contact between the roller burnishing element 22 of the roller burnishing cutter 2 and the surface to be burnished of part 1. The extrusion force between the roller burnishing element 22 and the surface to be burnished of part 1 can be adjusted by adjusting the program's parameter values. During roller burnishing, roller burnishing cutter 2 is mounted on the turret of a turning center, the machine tool is started, and the machine spindle drives part 1 to roll. The roller burnishing cutter 2 is then controlled by the program to move across the surface of part 1, causing it to perform roller burnishing on the surface to be burnished (the "roller burnishing cutter 2" can be compared to the "turning tool" used in turning). The roughness of the burnished surface can be significantly improved after roller burnishing.

[0048] In summary, after reading the present invention document, ordinary technicians in this field can make various other corresponding transformation schemes based on the technical solutions and technical concepts of the present invention without creative mental work, which all fall within the scope of protection of the present invention.

Claims

1. A roller burnishing knife, comprising a knife handle (21) and a roller burnishing element (22), wherein the knife handle (21) is provided with a mounting hole (213) matching the roller burnishing element (22), and the roller burnishing element (22) is rotatably arranged in the mounting hole (213), characterized in that: The tool holder (21) further comprises a bearing (23), a mounting member and a locking member; a housing cavity and a through hole are further provided on the tool holder (21), and the mounting hole (213), the housing cavity and the through hole are sequentially connected; the bearing (23) is rotatably mounted in the housing cavity via the mounting member, and the outer ring of the mounted bearing (23) contacts the roller element (22) to form a first contact point (221); the locking member is arranged in the through hole and can contact the outer ring of the bearing (23) to form a second contact point (281); by adjusting and fixing the position of the locking member, the extrusion force applied by the locking member to the outer ring of the bearing (23) at the second contact point (281) is changed, thereby adjusting the flexibility of the outer ring of the bearing (23) in rotation and changing the relative motion form between the roller element (22) and the surface of the part (1).

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

3. The roller burnishing cutter according to claim 2, characterized in that: The central axis of the roller burnishing element (22) and the locking element coincides with a radial center line passing through the geometric center of the bearing (23).

4. The roller burnishing cutter according to claim 1, characterized in that: The mounting member comprises a support shaft (24), a limiting ring (25), a gasket (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 gasket (26) and is screwed into the support shaft (24).

5. The roller burnishing cutter according to claim 1, characterized in that: The through hole is a threaded hole (212), and the locking member is a compression screw (28) matching the threaded hole (212).

6. The roller burnishing cutter according to claim 5, characterized in that: The end of the pressing screw (28) close to one end of the bearing (23) is in a round head shape.

7. The roller burnishing cutter according to claim 1, characterized in that: A closing ring (211) is provided around the mounting hole (213) for preventing the rolling element (22) from falling.

8. The roller burnishing cutter according to claim 1, characterized in that: The rolling element (22) is spherical or cylindrical.

9. The roller burnishing cutter according to claim 8, characterized in that: When the roller burnishing element (22) is cylindrical, the two end surfaces are spherical bulges, and two line contacts and two point contacts are formed between the roller burnishing element (22) and the mounting hole (213).

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

11. A method for using a roller burnishing cutter according to any one of claims 1 to 10, characterized in that: When roller burnishing is required, the position of the locking member is adjusted, and the extrusion force exerted by the locking member on the outer ring of the bearing (23) at the second contact point (281) is further adjusted: when the extrusion force is large enough, the outer ring of the bearing (23) is locked, and the roller burnishing element (22) and the surface of the part (1) are in a pure sliding operation state; when the extrusion force is moderate, the outer ring of the bearing (23) can rotate but cannot rotate flexibly, and the roller burnishing element (22) and the surface of the part (1) are in a mixed sliding and rolling motion state; when the locking member is not in contact with the outer ring of the bearing (23), the outer ring of the bearing (23) rotates flexibly, and the roller burnishing element (22) and the surface of the part (1) are in a pure rolling motion state.

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