Ball extrusion cutter

Abstract

The invention provides a ball extrusion cutter which comprises a cutter bar, a first rolling part, a second rolling part and a positioning assembly, a mounting groove is formed in one end of the cutter bar, a plurality of spherical nest holes are formed in the inner wall of the mounting groove, one part of the first rolling part is arranged in the mounting groove in a rolling mode, and the other part of the first rolling part extends out of the mounting groove; one part of each second rolling piece is arranged in the spherical nest hole in a rolling mode, the other part of each second rolling piece extends out of the spherical nest hole, and the positioning assembly is arranged between the first rolling piece and the cutter bar; according to the ball extrusion cutter provided by the invention, the first rolling piece stably rolls in the mounting groove of the cutter bar through the positioning assembly and the second rolling piece, so that the friction mode between the first rolling piece and the workpiece to be machined is rolling friction; and the problems of cutter service life reduction, workpiece surface damage, workpiece hardened layer generation and machine tool precision and service life damage caused by sliding friction are avoided.

Description

Technical Field

[0001] This application belongs to the technical field of numerically controlled plastic forming tools, and particularly relates to a ball extrusion tool. Background Technique

[0002] Single-point incremental numerical control forming technology is a method of gradually forming a tool on a sheet metal point by point through a numerically controlled machine tool, and is commonly used for manufacturing complex-shaped skin parts.

[0003] The tool used in single-point incremental numerical control forming technology during production is an extrusion forming tool, and the head of the extrusion forming tool is a fixed ball head; during the processing, the ball head gradually advances along the numerically controlled tool path to extrude the skin, causing plastic deformation at the contact point of the skin, and finally making the workpiece meet the standards.

[0004] However, the friction mode generated by the ball head when extruding the skin is sliding friction, and sliding friction will bring many problems. For example, it accelerates the wear of the tool ball head, reduces the service life of the tool, and when obvious defects appear in the tool, it will seriously damage the surface of the workpiece, resulting in the scrapping of the workpiece; a hardened layer is generated on the surface of the workpiece, and there is an obvious delamination phenomenon between the hardened layer and the internal material of the workpiece, which is likely to cause the surface layer to fall off; the main shaft of the numerically controlled machine tool is subjected to a large lateral load, which causes great damage to the guide rail of the machine tool transmission mechanism, seriously damaging the accuracy and service life of the machine tool. Summary of the Invention

[0005] In view of the deficiencies in the related art, this application provides a ball extrusion tool, which enables the first rolling member to roll stably in the installation groove of the tool rod through the positioning assembly and the second rolling member, so that the friction mode between the first rolling member and the workpiece to be processed is rolling friction, avoiding the problems of reducing the service life of the tool, damaging the surface of the workpiece, generating a hardened layer on the workpiece, and damaging the accuracy and service life of the machine tool caused by sliding friction.

[0006] This application provides a ball extrusion tool, including:

[0007] A tool rod, one end of the tool rod is provided with an installation groove, and a plurality of spherical socket holes are provided on the inner wall of the installation groove;

[0008] A first rolling member, a part of the first rolling member rolls in the installation groove, and the other part extends out of the installation groove for rolling and extruding a workpiece to be processed;

[0009] A second rolling member, a part of the plurality of second rolling members rolls in the spherical socket holes, and the other part extends out of the spherical socket holes for rolling and extruding the first rolling member;

[0010] A positioning component, which is arranged between the first rolling element and the tool bar. The positioning component is used to limit the movement of the first rolling element in the direction away from the tool bar, and is also used to prevent the plurality of second rolling elements from disengaging from the spherical socket holes and coming into contact with each other.

[0011] In some embodiments, the positioning component further includes:

[0012] A first positioning member, which is covered on one end of the tool bar and located on one side of the installation groove. A first relief hole is formed in the first positioning member, and the inner diameter of the first relief hole is not greater than the outer diameter of the first rolling element;

[0013] A second positioning member, which is arranged between the first rolling element and the tool bar. A plurality of second relief holes are formed in the second positioning member, and the second relief holes cooperate with the spherical socket holes to position the second rolling elements.

[0014] In some embodiments, the ball extrusion tool further includes:

[0015] A first stepped structure, which is arranged on the first positioning member. The first stepped structure is used to limit the axial movement of the second positioning member along the tool bar and limit the radial movement of the second positioning member along the tool bar.

[0016] In some embodiments, the first stepped structure includes:

[0017] A first abutting surface, which is used to abut against the end face of the tool bar;

[0018] A first stepped surface, which is arranged between the first abutting surface and the first relief hole. Two ends of the second positioning member respectively abut against the first stepped surface and the inner wall of the installation groove;

[0019] A first preset distance is provided between the first stepped surface and the end face of the tool bar, so that a height difference is formed between the first stepped surface and the first abutting surface to form the first stepped structure.

[0020] In some embodiments, the ball extrusion tool further includes:

[0021] A second stepped structure, which is arranged on the tool bar. The second stepped structure is used to limit the radial movement of the first positioning member along the tool bar.

[0022] In some embodiments, the second stepped structure further includes:

[0023] A second abutting surface;

[0024] The second stepped surface is disposed between the second abutting surface and the mounting groove. A second preset distance is provided between the second stepped surface and the second abutting surface, so that a second stepped structure is formed between the second stepped surface and the second abutting surface.

[0025] In some embodiments, the ball extrusion tool further includes:

[0026] A lubricating space is provided between the first rolling member and the second positioning member;

[0027] A lubricating structure for communicating with the lubricating space to facilitate the delivery of grease to the lubricating space.

[0028] In some embodiments, the lubricating structure further includes:

[0029] A third relief hole is formed through the second positioning member;

[0030] A lubricating passage is formed through the tool shank, and the lubricating passage communicates with the third relief hole.

[0031] In some embodiments, a plurality of limiting spaces are formed by enclosing the inner wall of the spherical socket hole, the inner wall of the second relief hole, and the outer wall of the first rolling member. The plurality of limiting spaces communicate with the lubricating space, and the plurality of limiting spaces are used to limit the plurality of second rolling members from separating from the spherical socket hole and coming into contact with each other.

[0032] In some embodiments, the ball extrusion tool further includes:

[0033] Fixing members, a plurality of the fixing members pass through the positioning assembly and are connected to the tool shank for fixing the relative positions of the positioning assembly and the tool shank.

[0034] In summary, the present application provides a ball extrusion tool. By means of the positioning component and the second rolling member, the first rolling member can roll stably in the installation groove of the tool bar, so that the friction mode between the first rolling member and the workpiece to be machined is rolling friction, avoiding the problems of reducing the service life of the tool, damaging the surface of the workpiece, generating a hardened layer on the workpiece, and damaging the accuracy and service life of the machine tool caused by sliding friction; by the first positioning member, the movement of the first rolling member away from the tool bar is restricted, so that the first rolling member is always located at one end of the tool bar for extruding the workpiece to be machined; by the second positioning member, the multiple second rolling members are restricted from separating from the spherical socket holes to contact each other, so that the second rolling members are stably and evenly distributed on one side of the first rolling member facing the installation groove for reducing friction; by the first step structure, the movement of the second positioning member along the axial and radial directions of the tool bar is restricted, so that it remains stable to limit the second rolling member; by the second step structure, the movement of the first positioning member along the radial direction of the tool bar is restricted, so that it remains stable to limit the first rolling member and the second positioning member; by providing a lubrication structure, lubricating grease can be added to the lubrication space without disassembling the tool, further reducing friction; by providing a limiting space to ensure the stable rolling of the second rolling member inside it; by the fixing member, the relative position of the positioning component and the tool bar is fixed.

[0035] Other features and advantages of the present invention will be described in the following specification, and some will become obvious from the description in the specification, or be understood by implementing the present invention. The objectives and other advantages of the present invention can be achieved and obtained through the structures pointed out in the specification, claims and drawings. Brief Description of the Drawings

[0036] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation to the present application. In the drawings:

[0037] Figure 1 is a schematic internal structure diagram of the ball extrusion tool of the present application;

[0038] Figure 2 is a schematic cross-sectional structure diagram of the first positioning member of the ball extrusion tool of the present application;

[0039] Figure 3 is an exploded view of the ball extrusion tool of the present application.

[0040] In the figures:

[0041] 100. Tool shank; 101. Mounting groove; 102. Second abutting surface; 103. Second step surface; 104. Lubrication channel; 200. First rolling element; 300. Second rolling element; 400. First positioning member; 401. First relief hole; 402. First abutting surface; 403. First step surface; 500. Second positioning member; 501. Second relief hole; 600. Fixing member. Detailed implementation mode

[0042] The following will clearly and completely describe the technical solutions in the embodiments with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts belong to the scope protected by the present application.

[0043] In the description of the present application, it should be understood that the terms "center", "transverse", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0044] The terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first", "second", "third" may explicitly or implicitly include one or more of such features.

[0045] In the description of the present application, it should be noted that unless otherwise clearly defined and limited, the terms "mount", "connect", "couple" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. Specific embodiment

[0047] Refer to the attached Figures 1 to 3 , Figure 1 which is a schematic internal structure diagram of the ball extrusion tool of the present application; Figure 2 which is a schematic cross-sectional structure diagram of the first positioning member of the ball extrusion tool of the present application; Figure 3 which is an exploded view of the ball extrusion tool of the present application; The following will describe specific embodiments with reference to the above accompanying drawings.

[0048] Reference appendix Figures 1 to 3 Figures 1 to 3 For this application, a ball extrusion tool is provided, including a tool shank 100, a first rolling element 200, a second rolling element 300, and a positioning component. Wherein, one end of the tool shank 100 is provided with a mounting groove 101, and a plurality of spherical socket holes are provided on the inner wall of the mounting groove 101. A part of the first rolling element 200 is rotatably arranged in the mounting groove 101, and the other part extends out of the mounting groove 101 for rolling and extruding a workpiece to be machined. A part of the plurality of second rolling elements 300 is rotatably arranged in the spherical socket holes, and the other part extends out of the spherical socket holes for rolling and extruding the first rolling element 200. The positioning component is arranged between the first rolling element 200 and the tool shank 100. The positioning component is used to limit the movement of the first rolling element 200 away from the tool shank 100, and is also used to limit the plurality of second rolling elements 300 from disengaging from the spherical socket holes to contact each other.

[0049]

[0049] Through the positioning component and the second rolling element 300, the first rolling element 200 can stably roll in the mounting groove 101 of the tool shank 100, so that the friction mode between the first rolling element 200 and the workpiece to be machined is rolling friction, avoiding problems such as reducing the service life of the tool, damaging the surface of the workpiece, generating a hardened layer on the workpiece, and damaging the accuracy and service life of the machine tool caused by sliding friction.

[0050] Reference appendix Figure 1 And Figure 3 Figure 3 In some embodiments, the ball extrusion tool includes a tool shank 100. One end of the tool shank 100 is provided with a mounting groove 101, and a plurality of spherical socket holes are provided on the inner wall of the mounting groove 101.

[0051] Specifically, the tool shank 100 is a force transmission medium between the first rolling element 200 and the spindle of the CNC machine tool, and is used to evenly disperse the extrusion load during machining to the body of the tool shank 100 through a plurality of second rolling elements 300.

[0052] The mounting groove 101 is opened along the axis of the tool shank 100 towards the end face of the tool shank 100. The mounting groove 101 is a hemispherical groove, and the center of the sphere of the hemispherical groove is located on the axis of the tool shank 100. The mounting groove 101 is used to accommodate the first rolling element 200 and the second rolling element 300, and provides an assembly basis for the cooperation between the first rolling element 200 and the second rolling element 300.

[0053] A plurality of spherical socket holes are also provided on the inner wall of the mounting groove 101. The plurality of spherical socket holes are evenly distributed on the inner wall of the mounting groove 101, and adjacent spherical socket holes are spaced apart by a preset distance, so that the rolling of the plurality of second rolling elements 300 does not affect each other.

[0054] The spherical socket holes are used to mount the second rolling elements 300. The radius of curvature of the spherical socket holes is greater than the radius of the second rolling elements 300, forming a clearance fit.

[0055] Reference appendix Figure 1 And Figure 3 Moreover, the ball extrusion tool further includes a first rolling member 200. A part of the first rolling member 200 rolls in the installation groove 101, and the other part extends out of the installation groove 101 for rolling and extruding a workpiece to be processed.

[0056] Specifically, the first rolling member 200 is a ball made of silicon nitride ceramic or cemented carbide. A part of the first rolling member 200 rolls in the installation groove 101. The diameter of the first rolling member 200 is larger than the maximum inner diameter of the installation groove 101, so that the other part of the first rolling member 200 extends out of the installation groove 101 to extrude a workpiece to be processed.

[0057] Reference appendix Figure 1 And Figure 3 Moreover, the ball extrusion tool further includes a second rolling member 300. A part of the plurality of second rolling members 300 rolls in the spherical socket holes, and the other part extends out of the spherical socket holes for rolling and extruding the first rolling member 200.

[0058] Specifically, the second rolling member 300 is a ball made of silicon nitride ceramic or cemented carbide. A part of the second rolling member 300 rolls in the spherical socket holes, and the other part extends out of the spherical socket holes for rolling and extruding the first rolling member 200.

[0059] Based on the uniform arrangement of the plurality of spherical socket holes, the plurality of second rolling members 300 are in point contact with and support the first rolling member 200 on the side facing the installation groove 101, achieving a high-density and uniform multi-point support effect and reducing the friction between the second rolling member 300 and the first rolling member 200.

[0060] The ball extrusion tool further includes a positioning assembly. The positioning assembly is arranged between the first rolling member 200 and the tool shank 100. The positioning assembly is used to limit the movement of the first rolling member 200 in the direction away from the tool shank 100, and is also used to limit the plurality of second rolling members 300 from disengaging from the spherical socket holes to come into contact with each other.

[0061] Reference appendix Figures 1 to 3 In some embodiments, the positioning assembly further includes a first positioning member 400 and a second positioning member 500. The first positioning member 400 covers one end of the tool shank 100 and is located on one side of the installation groove 101. A first relief hole 401 is formed in the first positioning member 400, and the inner diameter of the first relief hole 401 is not larger than the outer diameter of the first rolling member 200. The second positioning member 500 is arranged between the first rolling member 200 and the tool shank 100. A plurality of second relief holes 501 are formed in the second positioning member 500, and the second relief holes 501 cooperate with the spherical socket holes to position the second rolling members 300.

[0062] Reference appendix Figure 1 AndFigure 2 Specifically, the first positioning member 400 is an annular gland with an inner conical surface, and the manufacturing materials of the first positioning member 400 include but are not limited to stainless steel and titanium alloy.

[0063] A first relief hole 401 is formed in the middle of the first positioning member 400. The inner diameter of the first relief hole 401 at the end far from the tool shank 100 is not greater than the outer diameter of the first rolling member 200. One end of the first rolling member 200 extends out of the mounting groove 101 through the first relief hole 401, and the first rolling member 200 is in surface contact with the first positioning member 400.

[0064] After the first rolling member 200 is installed in the mounting groove 101, the first positioning member 400 is covered on the opening side of the mounting groove 101, so that the first rolling member 200 can only extend out of the mounting groove 101 through the first relief hole 401. The first positioning member 400 is used to prevent the first rolling member 200 from disengaging from the mounting groove 101, thereby ensuring that the first rolling member 200 rolls in the mounting groove 101 and stably presses the workpiece to be processed.

[0065] Refer to the appendix Figure 1 and Figure 3 The second positioning member 500 is a hemispherical cover plate, and the manufacturing materials of the second positioning member 500 include but are not limited to stainless steel and titanium alloy.

[0066] A plurality of second relief holes 501 are formed in the second positioning member 500, and chamfers are provided at the edges of the second relief holes 501, so as to form a line contact with the second ball.

[0067] After the second rolling member 300 is installed in the spherical socket hole, the outer wall of the second rolling member 300 is tangent to the inner wall of the spherical socket hole. The second positioning member 500 is installed in the mounting groove 101 so that each second relief hole 501 corresponds to the spherical socket hole. The second positioning member 500 is used to prevent the plurality of second rolling members 300 from disengaging from the spherical socket hole and affecting each other, thereby ensuring that the second rolling member 300 rolls in the spherical socket hole and stably supports the first rolling member 200.

[0068] Refer to the appendix Figure 1 and Figure 2 In some embodiments, the first positioning member 400 is provided with a first step structure, which is used to limit the axial movement of the second positioning member 500 along the tool shank 100 and limit the radial movement of the second positioning member 500 along the tool shank 100.

[0069] The first stepped structure further includes a first abutting surface 402 and a first stepped surface 403. The first abutting surface 402 is used to abut against the end face of the tool shank 100. The first stepped surface 403 is disposed between the first abutting surface 402 and the first relief hole 401. Two ends of the second positioning member 500 respectively abut against the first stepped surface 403 and the inner wall of the mounting groove 101. A first preset distance is provided between the first stepped surface 403 and the end face of the tool shank 100, so that a height difference is formed between the first stepped surface 403 and the first abutting surface 402 to form the first stepped structure.

[0070] Specifically, the first abutting surface 402 faces the end face of the tool shank 100. The first abutting surface 402 is a plane on the first positioning member 400 that contacts the end face of the tool shank 100. The distance between the first abutting surface 402 and the end face of the tool shank 100 is zero.

[0071] The first stepped surface 403 is disposed between the first abutting surface 402 and the first relief hole 401. The first stepped surface 403 faces the end face of the tool shank 100. A first preset distance is provided between the first stepped surface 403 and the end face of the tool shank 100, so that a height difference is formed between the first stepped surface 403 and the first abutting surface 402, thereby forming the first stepped structure.

[0072] After the second positioning member 500 is inserted into the mounting groove 101, the first positioning member 400 is then installed to limit the second positioning member 500. At this time, the spherical end of the second positioning member 500 abuts against the inner wall of the mounting groove 101, and the other end abuts against the first stepped surface 403 of the first positioning member 400, so that the movement of the second positioning member 500 in the axial direction of the tool shank 100 is restricted. And, the side wall between the first abutting surface 402 and the first stepped surface 403 also limits the second positioning member 500, so that the movement of the second positioning member 500 in the radial direction of the tool shank 100 is restricted.

[0073] Refer to the appendix Figure 1 And Figure 3 , in some embodiments, a second stepped structure is disposed on the tool shank 100,

[0074] The second stepped structure is used to limit the radial movement of the first positioning member 400 along the tool shank 100.

[0075] The second stepped structure further includes a second abutting surface 102 and a second stepped surface 103. The second stepped surface 103 is disposed between the second abutting surface 102 and the mounting groove 101. A second preset distance is provided between the second stepped surface 103 and the end face of the first positioning member 400, so that a second stepped structure is formed between the second stepped surface 103 and the second abutting surface 102.

[0076] Specifically, the second step surface 103 is disposed between the second abutting surface 102 and the installation groove 101. When the first positioning member 400 is covered on the tool bar 100, the second step surface 103 correspondingly contacts the first abutting surface 402.

[0077] A second preset distance is provided between the second step surface 103 and the second abutting surface 102, so that there is a height difference between the second step surface 103 and the second abutting surface, thereby forming a second step structure.

[0078] After the first positioning member 400 is installed at one end of the tool bar 100, the second step abuts against the first abutting surface 402, so that there is a second preset distance between the second abutting surface 102 and the first abutting surface 402. Furthermore, the side wall between the second step surface 103 and the second abutting surface 102 limits the first positioning member 400, and the movement of the first positioning member 400 in the radial direction along the axis of the tool bar 100 is restricted.

[0079] Reference appendix Figure 1 And Figure 3 , in some embodiments, a plurality of fixing members 600 pass through the positioning assembly and are connected to the tool bar 100 for fixing the relative position between the positioning assembly and the tool bar 100.

[0080] Specifically, the fixing members 600 include but are not limited to screws, bolts, and pins.

[0081] The plurality of fixing members 600 are uniformly arranged around the installation groove 101. The fixing members 600 penetrate through the first positioning member 400, enter from the end of the first positioning member 400 away from the tool bar 100, and after passing through the first abutting surface 402, penetrate into the tool bar 100 again through the second step surface 103, thereby fixing the relative position between the first positioning member 400 and the tool bar 100.

[0082] Reference appendix Figure 1 , in some embodiments, a lubricating space is provided between the first rolling member 200 and the second positioning member 500; the ball-extrusion tool further includes a lubricating structure for communicating the lubricating space to facilitate the delivery of lubricating grease to the lubricating space.

[0083] The lubricating structure further includes a third relief hole and a lubricating channel 104. The third relief hole penetrates through the second positioning member 500; the lubricating channel 104 penetrates through the tool bar 100, and the lubricating channel 104 communicates with the third relief hole.

[0084] Specifically, a lubricating space is provided between the first rolling member 200 and the second positioning member 500. The lubricating space is used to accommodate lubricating grease to reduce the friction when the first rolling member 200 rolls.

[0085] The lubrication structure is used to connect the lubrication space with the outside of the ball extrusion tool, so as to facilitate the user to transport the grease from the outside of the ball extrusion tool into the lubrication space.

[0086] The third relief hole is a through hole formed in the second positioning member 500. The third relief hole is used to connect the two ends of the second positioning member 500, so that the grease can be directly sent to the first rolling member 200 through the third relief hole.

[0087] The lubrication channel 104 is formed in the tool shank 100. The lubrication channel 104 includes an input port and an output port. The input port is formed in the side wall of the tool shank 100, and the output port is formed in the inner wall of the installation groove 101. The output port corresponds to and communicates with the third relief hole.

[0088] In some embodiments, a plurality of limiting spaces are formed by enclosing the inner wall of the spherical socket hole, the inner wall of the second relief hole 501, and the outer wall of the first rolling member 200. The plurality of limiting spaces communicate with the lubrication space, and the plurality of limiting spaces are used to limit the plurality of second rolling members 300 from separating from the spherical socket hole to contact each other.

[0089] Specifically, a plurality of limiting spaces are formed by enclosing the inner wall of the spherical socket hole, the inner wall of the second relief hole 501, and the outer wall of the first rolling member 200. The second rolling member 300 can only perform rotational motion, and the plurality of limiting spaces are also used to limit the plurality of second rolling members 300 from separating from the spherical socket hole to contact each other. Each second rolling member 300 rolls in its respective limiting space to support the rolling of the first rolling member 200.

[0090] The first rolling member 200 is restricted by the first relief hole 401 and the second rolling member 300 and can only perform rotational motion.

[0091] When the grease is sent into the lubrication space through the lubrication channel 104, when the first rolling member 200 and the second rolling member 300 roll relative to each other, the grease is brought from the lubrication space into each limiting space, thereby reducing the friction between each second rolling member 300 and the first rolling member 200.

[0092] When assembling the ball extrusion tool of the present application, first, the second rolling member 300 is loaded into the spherical socket hole, then the second positioning member 500 is loaded into the installation groove 101, and the second relief hole 501 is made to correspond to the spherical socket hole.

[0093] Then, the first rolling member 200 is loaded into the second positioning member 500, so that one end of the second rolling member 300 extending out of the second relief hole 501 makes point contact with the first rolling member 200.

[0094] Based on the first abutting surface 402 abutting against the second positioning member 500, and the second abutting surface 102 abutting against the first stepped surface 403, the first positioning member 400 is covered on one end of the tool shank 100, and the first rolling member 200 extends out through the first relief hole 401.

[0095] Finally, the relative positions of the first positioning member 400 and the tool shank 100 are fixed by a plurality of fixing members 600, thereby completing the assembly of the ball extrusion tool.

[0096] When the ball extrusion tool of the present application is working, when the first rolling member 200 has a relative displacement with the workpiece to be machined, under the action of friction, the first rolling member 200 rotates. The second rolling member 300 in the spherical socket also starts to rotate under the drive of the first rolling member 200. The contact between the first rolling member 200 and the first positioning member 400 is surface contact, the contact between the first rolling member 200 and the second rolling member 300 is point contact, and the contact between the second rolling member 300 and the second positioning member 500 is line contact. Under the action of the grease, the friction factor is very small, which can ensure that the first rolling member 200 rotates freely in all directions.

[0097] The present application provides a ball extrusion tool. By the positioning assembly and the second rolling member 300, the first rolling member 200 can roll stably in the installation groove 101 of the tool shank 100, so that the friction mode between the first rolling member 200 and the workpiece to be machined is rolling friction, avoiding the problems of reducing the tool service life, damaging the workpiece surface, generating a hardened layer on the workpiece, and damaging the machine tool accuracy and service life caused by sliding friction; by the first positioning member 400, the first rolling member 200 is restricted from moving away from the tool shank 100, so that the first rolling member 200 is always located at one end of the tool shank 100 for extruding the workpiece to be machined; by the second positioning member 500, a plurality of second rolling members 300 are restricted from separating from the spherical socket to contact each other, so that the second rolling members 300 are stably distributed on one side of the first rolling member 200 facing the installation groove 101 to reduce friction; by the first stepped structure, the second positioning member 500 is restricted from moving axially and radially along the tool shank 100 to keep it stable for limiting the second rolling member 300; by the second stepped structure, the first positioning member 400 is restricted from moving radially along the tool shank 100 to keep it stable for limiting the first rolling member 200 and the second positioning member 500; by providing a lubricating structure, grease can be added to the lubricating space without disassembling the tool, further reducing friction; by providing a limiting space to ensure that the second rolling member 300 rolls stably inside it; by the fixing member 600, the relative positions of the positioning assembly and the tool shank 100 are fixed.

[0098] Finally, it should be noted that the embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. For the same or similar parts among the embodiments, reference can be made to each other.

[0099] The above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them. Although the present application has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that: modifications can still be made to the specific implementation manners of the present application, or equivalent replacements can be made to some technical features; without departing from the spirit of the technical solutions of the present application, they should all be covered within the scope of the technical solutions claimed in the present application.

Claims

1. A ball extrusion tool, characterized in that, Comprising: A tool shank, one end of the tool shank is provided with a mounting groove, and a plurality of spherical socket holes are provided on the inner wall of the mounting groove; A first rolling member, a part of the first rolling member rolls in the mounting groove, and the other part extends out of the mounting groove for rolling and pressing a workpiece to be processed; A second rolling member, a part of a plurality of the second rolling members rolls in the spherical socket holes, and the other part extends out of the spherical socket holes for rolling and pressing the first rolling member; A positioning assembly, the positioning assembly is arranged between the first rolling member and the tool shank, the positioning assembly is used to limit the movement of the first rolling member in a direction away from the tool shank, and is also used to limit a plurality of the second rolling members from disengaging from the spherical socket holes to come into contact with each other.

2. The ball extrusion tool according to claim 1, wherein, The positioning assembly further includes: A first positioning member, covering one end of the tool shank and located on one side of the mounting groove, a first relief hole is provided on the first positioning member, and the inner diameter of the first relief hole is not greater than the outer diameter of the first rolling member; A second positioning member, arranged between the first rolling member and the tool shank, a plurality of second relief holes are provided on the second positioning member, and the second relief holes cooperate with the spherical socket holes to position the second rolling members.

3. The ball extrusion tool according to claim 2, wherein, It further includes: A first step structure, arranged on the first positioning member, the first step structure is used to limit the axial movement of the second positioning member along the tool shank and limit the radial movement of the second positioning member along the tool shank.

4. The ball extrusion tool according to claim 3, characterized in that, The first step structure includes: A first abutting surface, used to abut against the end face of the tool shank; A first step surface, arranged between the first abutting surface and the first relief hole, both ends of the second positioning member respectively abut against the first step surface and the inner wall of the mounting groove; A first preset distance is provided between the first step surface and the end face of the tool shank, so that a height difference is formed between the first step surface and the first abutting surface to form the first step structure.

5. The ball extrusion tool according to claim 2, wherein, It further includes: A second step structure, arranged on the tool shank, the second step structure is used to limit the radial movement of the first positioning member along the tool shank.

6. The ball extrusion tool according to claim 5, characterized in that, The second step structure further includes: A second abutting surface; A second step surface, arranged between the second abutting surface and the mounting groove, a second preset distance is provided between the second step surface and the second abutting surface, so that the second step surface and the second abutting surface form the second step structure.

7. The ball extrusion tool according to claim 2, characterized in that, It further includes: A lubrication space is provided between the first rolling member and the second positioning member; A lubrication structure, the lubrication structure is used to communicate with the lubrication space to facilitate the delivery of lubricating grease to the lubrication space.

8. The ball extrusion tool according to claim 7, wherein The lubrication structure further includes: A third relief hole, penetrating through the second positioning member; A lubrication channel, penetrating through the tool shank, the lubrication channel is communicated with the third relief hole.

9. The ball extrusion tool according to claim 7, characterized in that, The inner wall of the spherical socket hole, the inner wall of the second relief hole and the outer wall of the first rolling member enclose a plurality of limiting spaces, the plurality of limiting spaces are communicated with the lubrication space, and the plurality of limiting spaces are used to limit a plurality of the second rolling members from disengaging from the spherical socket holes to come into contact with each other.

10. The ball extrusion tool according to any one of claims 1 to 9, characterized in that, It further includes: Fixing members, and a plurality of the fixing members pass through the positioning assembly and are connected to the tool bar, for fixing the relative positions of the positioning assembly and the tool bar.

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