Ball head cutter with limiting structure

Abstract

The invention discloses a ball head cutter with a limiting structure, which belongs to the field of metal cutting machining and comprises a ball head blade, a matched cutter body and a locking screw. A first main cutting edge, a second main cutting edge, a tool nose and a screw through hole are formed on the ball head blade, and an upper open type positioning part and a lower open type positioning part are respectively formed on two assembling sides of the ball head blade. The matched cutter body comprises two cutter clamps, a screw counter bore and a cutter handle, and the two cutter clamps are provided with an upper limiting part and a lower limiting part respectively. The locking screws are in threaded connection with the screw through holes and the screw counter bores respectively. The installation direction between the ball head blade and the matched cutter body is forcibly fixed to be the axial direction, and therefore the radial displacement of the ball head blade is limited. The ball head blade and the matched cutter body are matched in a wedge-shaped pressing mode through the reverse limiting structures on the two sides, and axial clamping is more reliable under the locking force effect of the locking screw.

Description

Technical Field

[0001] The invention belongs to the field of metal cutting and processing, in particular to a ball head tool with a limiting structure. Background Art

[0002] In the field of metal cutting, especially in the cutting of medium and large molds and parts such as automobile mold covers and impellers, the use of single-piece mounted precision milling ball end mills has become very common, and is often used in processing methods such as surface processing, cavity processing and groove processing. Due to its excellent performance in processing stability, processing accuracy and processing efficiency, it is often used in the final process belonging to the category of fine processing, which means that the cutting allowance reserved in the previous process is small, and the surface accuracy of the parts is required to be higher. In high-speed cutting, if the tool size is not maintained well or accompanied by vibration, it will have a great impact on the accuracy of the workpiece. At the least, the workpiece will be unqualified and need to be repaired, and at the worst, the workpiece will be scrapped. Limiting the displacement of the blade in the tool holder can solve the above problems to varying degrees.

[0003] Patent publication number CN110899800A discloses a replaceable single-cutting blade precision milling ball-end cutter, which can limit the radial displacement, axial displacement and circumferential displacement of the blade in the tool groove by cooperating two convex arc positioning surfaces at the bottom of the blade with two concave arc positioning surfaces on the tool body.

[0004] In this scheme, the contact area of ​​the convex arc positioning surface used for positioning is limited. When the blade is statically installed, it cannot provide sufficient guidance and initial positioning for the blade, which may easily lead to improper axial and radial installation. When the blade is subjected to cutting force, the arc positioning surface tends to move relative to the positioning surface of the tool body, resulting in a certain degree of loss in the support force of the tool body on the blade, thereby insufficiently restricting the radial displacement, axial displacement and circumferential displacement of the blade in the tool groove. Summary of the invention

[0005] The object of the present invention is to provide a ball-end tool with a limiting structure to solve the above-mentioned problems in the prior art.

[0006] Provided is a ball-end tool with a limiting structure, comprising:

[0007] A ball-end blade, wherein two working sides of the ball-end blade respectively form a first main cutting edge and a second main cutting edge, the first main cutting edge and the second main cutting edge extend toward an end different from the assembly direction of the ball-end blade and intersect to form a blade tip, and two assembly sides of the ball-end blade respectively form an upper open positioning portion and a lower open positioning portion, and the upper open positioning portion is adjacent to the second main cutting edge, and the lower open positioning portion is adjacent to the first main cutting edge, and the parts of the two assembly sides of the ball-end blade different from the upper open positioning portion and the lower open positioning portion penetrate each other to form a screw through hole;

[0008] A matching knife body, which includes two knife clamps, a screw countersunk hole and a knife handle, wherein the two knife clamps are arranged oppositely and formed on the knife handle, the screw countersunk hole is formed by two through holes that the two knife clamps penetrate oppositely, one of the knife clamps is provided with an upper limit portion that fits with the upper open positioning portion, and the other knife clamp is provided with a lower limit portion that fits with the lower open positioning portion;

[0009] A locking screw is threadedly connected to the screw through hole and the screw countersunk hole respectively to match the ball head blade with the matching blade body.

[0010] As a further embodiment of the present invention: the ball-end blade includes an upper surface, a lower surface and a side peripheral surface, the upper surface and the lower surface are connected and transitioned through the side peripheral surface, the upper surface includes an upper end positioning surface, an upper open positioning portion and a first front cutting edge that form an elevation difference with each other, the lower surface includes a lower end positioning surface, a lower open positioning portion and a second front cutting edge that form an elevation difference with each other, the side peripheral surface includes a side positioning surface, a first back angle surface and a second back angle surface, the first back angle surface is adjacent to the lower open positioning portion, the second back angle surface is adjacent to the upper open positioning portion, the first main cutting edge is formed by the intersection of the first front cutting edge and the first back angle surface, and the second main cutting edge is formed by the intersection of the second front cutting edge and the second back angle surface.

[0011] As a further embodiment of the present invention: the upper open positioning portion is a groove structure recessed inwardly relative to the upper end positioning surface, the lower open positioning portion is a groove structure recessed inwardly relative to the lower end positioning surface, the upper limit portion is a boss structure fitted with the upper open positioning portion, and the lower limit portion is a boss structure fitted with the lower open positioning portion.

[0012] As a further embodiment of the present invention: the inner wall portion of the tool handle located between the two tool clamps is a side clamping surface, the opposite surfaces of the two tool clamps are respectively an upper clamping surface and a lower clamping surface, the side positioning surface and the side clamping surface can be fitted with each other, and the intersection portions of the side clamping surface with the upper clamping surface and the lower clamping surface are respectively recessed toward the interior of the tool handle.

[0013] As a further embodiment of the present invention: the upper open positioning portion includes a small bevel and a large bevel, the small bevel intersects with the large bevel to form an intersection line, the extension line of the ball head blade passing through the tip and parallel to the center axis of the matching blade body is the center axis of the ball head blade, the center axis of the screw through hole is perpendicular to the center axis of the ball head blade, the center axis of the screw through hole and the extension line of the intersection line form two projection lines on the radial plane of the center axis of the screw through hole, and an angle of α is formed between the two projection lines, and the angle α is 15°~45°.

[0014] As a further embodiment of the present invention: the lower open positioning portion includes a small bevel and a large bevel, the small bevel intersects with the large bevel to form an intersection line, the extension line of the ball head blade passing through the tip and parallel to the center axis of the matching blade body is the center axis of the ball head blade, the center axis of the screw through hole is perpendicular to the center axis of the ball head blade, the center axis of the screw through hole and the extension line of the intersection line form two projection lines on the radial plane of the center axis of the screw through hole, and an angle of α is formed between the two projection lines, and the angle α is 15°~45°.

[0015] As a further embodiment of the present invention: taking the central axis of the ball-end blade as the rotation axis, the upper open positioning portion and the lower open positioning portion are rotationally symmetrical on the rotation axis.

[0016] As a further embodiment of the present invention: taking the central axis of the ball-end insert as the rotation axis, the first main cutting edge and the second main cutting edge are rotationally symmetrical on the rotation axis.

[0017] As a further embodiment of the present invention: in the direction of extension of the central axis from the screw through hole to the tool tip, the large inclined surface is inclined upward along this direction, and the inclination angle is 0.05° to 0.5°.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. The present invention forms interference between the upper open positioning part on the ball-end blade and the upper limit part on one tool holder, and forms interference between the lower open positioning part on the ball-end blade and the lower limit part on the other tool holder, so as to force the installation direction between the ball-end blade and the matching cutter body to be fixed to the axial direction, thereby limiting the radial displacement of the ball-end blade. The ball-end blade and the matching cutter body are pressed together by the limit structures on both sides in opposite directions, and the axial clamping is more reliable under the locking force of the locking screw.

[0020] 2. In the early stage of inserting the ball-end insert into the tool holder, the upper open positioning part and the lower open positioning part can guide the ball-end insert to be installed axially, play a guiding and initial positioning role for the ball-end insert, and improve the installation efficiency and matching accuracy of the insert. At the same time, the installation process makes the structure on the matching tool body avoid the main cutting edge and the tip of the ball-end insert, which protects the main cutting edge and the tip to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the embodiments of the present drawings or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present drawings. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0022] Figure 1 A is a three-dimensional diagram of a ball-end blade provided by the present invention;

[0023] Figure 2 FIG. B is a three-dimensional view of a ball-end blade provided by the present invention;

[0024] Figure 3 is a front view of the ball-end blade provided by the present invention;

[0025] Figure 4 is a bottom view of the ball-end blade provided by the present invention;

[0026] Figure 5 yes Figure 4 A cross-sectional view of the middle blade at position G;

[0027] Figure 6 yes Figure 4 A cross-sectional view of the middle blade F position;

[0028] Figure 7 yes Figure 4 A cross-sectional view of the middle blade at position E;

[0029] Figure 8 It is an assembly diagram of the ball end tool provided by the present invention;

[0030] Fig. 9 It is a structural exploded diagram of the ball end tool provided by the present invention;

[0031] Fig.10 yes Fig. 9 Side view of the exploded view;

[0032] Fig.11 It is a three-dimensional diagram of the matching knife body provided by the present invention;

[0033] Fig.12 It is a side view of the matching tool provided by the present invention.

[0034] In the figure: 1, ball-end blade; 2, locking screw; 3, matching tool body; 4, upper surface; 5, lower surface; 6, side positioning surface; 7, screw through hole; 8, first back angle surface; 9, second back angle surface; 10, side peripheral surface; 11, first main cutting edge; 12, second main cutting edge; 13, tool tip; 14, small bevel; 15, large bevel; 16, intersection line; 18, tool holder; 19, screw countersunk hole; 20, tool handle; 21, upper clamping surface; 22, lower clamping surface; 23, side clamping surface; 31, upper limit portion; 32, lower limit portion; 41, upper end positioning surface; 42, upper open positioning portion; 43, first rake surface; 51, lower end positioning surface; 52, lower open positioning portion; 53, second rake surface. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is described and illustrated below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work belong to the scope of protection of the present invention.

[0036] Obviously, the drawings described below are only some examples or embodiments of the present invention. For ordinary technicians in this field, the present invention can also be applied to other similar scenarios based on these drawings without creative work. In addition, it can also be understood that although the efforts made in this development process may be complicated and lengthy, for ordinary technicians in this field related to the content disclosed by the present invention, some changes in design, manufacturing or production based on the technical content disclosed by the present invention are just conventional technical means, and should not be understood as insufficient content disclosed by the present invention.

[0037] However, unnecessary detailed descriptions may be omitted. For example, detailed descriptions of well-known matters and repeated descriptions of substantially the same structures may be omitted. This is to avoid the following description from becoming unnecessarily lengthy and to facilitate understanding by those skilled in the art. In addition, the drawings and the following description are provided to enable those skilled in the art to fully understand the present invention and are not intended to limit the subject matter described in the claims.

[0038] See also Figure 1-Figure 12As shown, the ball-end tool with a limiting structure in the embodiment of the present invention comprises a ball-end blade 1, a matching blade body 3 and a locking screw 2. The two working sides of the ball-end blade 1 respectively form a first main cutting edge 11 and a second main cutting edge 12, the first main cutting edge 11 and the second main cutting edge 12 extend to an end different from the assembly direction of the ball-end blade 1 and intersect to form a tool tip 13, the two assembly sides of the ball-end blade 1 respectively form an upper open positioning portion 42 and a lower open positioning portion 52, and the upper open positioning portion 42 is adjacent to the second main cutting edge 12, and the lower open positioning portion 52 is adjacent to the first main cutting edge 11, and the parts of the two assembly sides of the ball-end blade 1 different from the upper open positioning portion 42 and the lower open positioning portion 52 penetrate each other to form a screw through hole 7. The matching blade body 3 includes two blade clamps 18, a screw countersunk hole 19 and a blade handle 20. The two blade clamps 18 are arranged oppositely and formed on the blade handle 20. The screw countersunk hole 19 is formed by two through holes that the two blade clamps 18 penetrate oppositely. An upper limit portion 31 that fits with the upper open positioning portion 42 is provided on one blade clamp 18, and a lower limit portion 32 that fits with the lower open positioning portion 52 is provided on the other blade clamp 18. The locking screw 2 is threadedly connected with the screw through hole 7 and the screw countersunk hole 19 respectively to make the ball head blade 1 and the matching blade body 3 cooperate with each other.

[0039] See also Fig. 9 As shown, when the ball-end blade 1 is usually installed with the matching cutter body 3, the ball-end blade 1 can be inserted between the two tool holders 18 in multiple directions, such as along the axial direction of the cutter body rotation axis, radial direction perpendicular to the cutter body rotation axis, and other multiple angles. Since the tool holder 18 space of such a cutter body is narrow, the matching accuracy of the ball-end blade 1 and the tool holder 18 is high, and manual clamping may fail after multiple attempts.

[0040] When performing non-axial installation, the main cutting edge on the ball-end blade 1 will first enter the tool holder 18, and the possibility of collision between the main cutting edge and the tool holder 18 space will increase, which will cause a difficult-to-find gap in the main cutting edge of the ball-end blade 1. As the cutting process proceeds, the gap will further deteriorate, which will affect the machining accuracy of the workpiece and reduce the service life of the tool. The solution of the present invention forces the installation direction of the ball-end blade 1 to be fixed axially, thereby limiting the radial displacement of the ball-end blade 1. At the same time, the installation process avoids the first main cutting edge 11, the second main cutting edge 12 and the tip 13 on the ball-end blade 1, which provides a certain degree of protection for the main cutting edge and the tip 13, and reduces the probability of damage to the main cutting edge.

[0041] The ball-end insert 1 includes an upper surface 4, a lower surface 5 and a side peripheral surface 10, and the upper surface 4 and the lower surface 5 are connected and transitioned through the side peripheral surface 10. The upper surface 4 includes an upper end positioning surface 41, an upper open positioning portion 42 and a first rake face 43 that form a height difference with each other, the lower surface 5 includes a lower end positioning surface 51, a lower open positioning portion 52 and a second rake face 53 that form a height difference with each other, and the side peripheral surface 10 includes a side positioning surface 6, a first clearance angle surface 8 and a second clearance angle surface 9.

[0042] The present invention has two embodiments. The first embodiment: the upper open positioning portion 42 is a groove structure that is recessed inwardly relative to the upper end positioning surface 41, the lower open positioning portion 52 is a groove structure that is recessed inwardly relative to the lower end positioning surface 51, the upper limit portion 31 is a boss structure that fits with the upper open positioning portion 42, and the lower limit portion 32 is a boss structure that fits with the lower open positioning portion 52. The second embodiment: the upper open positioning portion 42 is a boss structure that extends outwardly relative to the upper end positioning surface 41, the lower open positioning portion 52 is a boss structure that extends outwardly relative to the lower end positioning surface 51, the upper limit portion 31 is a groove structure that fits with the upper open positioning portion 42, and the lower limit portion 32 is a groove structure that fits with the lower open positioning portion 52. Both of the above embodiments can solve the technical problems of the present invention, and the present invention preferably adopts the first embodiment.

[0043] The upper end positioning surface 41 and the lower end positioning surface 51 are two parallel surfaces ground by a double end surface grinder, and cooperate with the tool holder 18 to limit the vertical normal displacement of the ball end insert 1 in the tool holder 18 perpendicular to the upper end positioning surface 41 and the lower end positioning surface 51. The screw through hole 7 is a straight hole that penetrates and is perpendicular to the upper end positioning surface 41 and the lower end positioning surface 51.

[0044] See also Figure 4 As shown, the extension line of the ball-end blade 1 passing through the blade tip 13 and parallel to the central axis of the matching blade body 3 is the central axis A of the ball-end blade 1, and the central axis of the screw through hole 7 is perpendicular to the central axis of the ball-end blade 1. In the two planes of the upper end positioning surface 41 and the lower end positioning surface 51, the central axis A divides the ball-end blade 1 into two left and right parts. Any part rotated along the central axis A by a multiple of a straight angle will overlap with the other part, which means that the upper open positioning part 42 of the ball-end blade 1 rotates along the central axis A by a straight angle to overlap with the lower open positioning part 52. The rotationally symmetrical structure ensures that the force between the ball-end blade 1 and the matching tool 3 is balanced during high-speed rotary cutting operations, avoiding eccentric loads that affect the service life of the ball-end blade 1.

[0045] Among them, see Figure 4As shown, the lower open positioning portion 52 includes a small inclined surface 14 and a large inclined surface 15, and the small inclined surface 14 and the large inclined surface 15 intersect to form an intersection line 16, and the intersection line 16 is limited between the side positioning surface 6 and the first back angle surface 8. The extension line of the central axis A and the intersection line 16 forms two projection lines on the radial plane of the central axis of the screw through hole 7, and an angle of α is formed between the two projection lines, and the angle α is 15° to 45°.

[0046] The purpose of limiting the above-mentioned angle α is that the friction force of the locking screw 2 or the external force of cutting will tend to cause the ball-end blade 1 to rotate around the locking screw 2. This technical solution requires a large bevel 15 with as large an area as possible to ensure that the blade has sufficient axial clamping force, making the clamping of the ball-end blade 1 more reliable and reducing fatigue damage to the locking screw 2. A small bevel 14 as long as possible is required to provide resistance to the circumferential displacement of the ball-end blade 1. Whether the ball-end blade 1 rotates clockwise or counterclockwise, it will be subject to resistance from the cooperation of the small bevel 14 and the boss of the lower limit portion 32 of the tool holder 18. With the cooperation of the side positioning surface 6, the displacement of the ball-end blade 1 on the circumference is limited to the maximum extent. Among them, the angle α is preferably 20°.

[0047] See also Figure 4-Figure 7 As shown, in the direction of the central axis extending from the screw through hole 7 to the blade tip 13, the large bevel 15 is inclined upward along the direction. The large bevel 15 and the lower end positioning surface 51 transition through the small bevel 14, and there is a height difference h between the large bevel 15 and the lower end positioning surface 51. The large bevel 15 is inclined upward along the central axis A toward the blade tip 13, that is, h1<h2<h3.

[0048] It should be noted that the structural arrangement and arrangement principle of the small slope 14, large slope 15 and intersection line 16 of the upper open positioning portion 42 correspond to those of the lower open positioning portion 52, and will not be described in detail. Preferably, the structural arrangement of the upper open positioning portion 42 is the same as that of the lower open positioning portion 52.

[0049] See also Figure 10-12As shown, during the axial installation of the ball-end insert 1, the upper limit portion 31 and the lower limit portion 32 in the tool holder 18 gradually fit with the upper open positioning portion 42 and the lower open positioning portion 52 respectively. The upper open positioning portion 42 and the lower open positioning portion 52 have an inclined large bevel 15, which cooperates with the upper limit portion 31 and the lower limit portion 32 to realize a wedge-shaped clamping method. Under the locking force of the locking screw 2, the axial clamping is more reliable. At the same time, during the continuous locking process of the locking screw 2, the locking screw 2 squeezes the ball-end insert 1 to make the side positioning surface 6 and the side clamping surface 23 fit more closely, and the reaction force of the ball-end insert 1 on the locking screw 2 will also increase. The intervention of the inclined large bevel 15 limits the continuous locking of the locking screw 2, and makes the side positioning surface 6 and the side clamping surface 23 properly contact, reducing the risk of fatigue fracture of the locking screw 2 due to excessive locking force. The inclination angle of the large bevel 15 is 0.05° to 0.5°.

[0050] The ball-end insert 1 has two main cutting edges, namely the first main cutting edge 11 and the second main cutting edge 12. Any main cutting edge rotated along the central axis A by a right angle will overlap with the other main cutting edge, so the structures of the two main cutting edges should be kept consistent as much as possible, so that the ball-end insert 1 can be subjected to uniform force when the first main cutting edge 11 and the second main cutting edge 12 are alternately cut.

[0051] The inner wall portion of the tool handle 20 located between the two tool clamps 18 is a side clamping surface 23. The opposite surfaces of the two tool clamps 18 are an upper clamping surface 21 and a lower clamping surface 22. The side positioning surface 6 and the side clamping surface 23 can fit each other. The intersection of the side clamping surface 23 with the upper clamping surface 21 and the lower clamping surface 22 is recessed toward the inside of the tool handle 20. The upper clamping surface 21 is provided with an upper limit portion 31, and the lower clamping surface 22 is provided with a lower limit portion 32. The space between the two tool clamps 18 is used to install the ball-end blade 1, provide support for the ball-end blade 1, and connect the ball-end blade 1 and the matching blade body 3 to each other through the locking screw 2.

[0052] The inwardly recessed structure ensures that when the ball-end blade 1 is assembled with the matching blade body 3, the blade holder 18 can be slightly deformed, and the interference caused by processing errors is reduced to ensure smooth assembly. At the same time, when the ball-end blade 1 is cutting, local stress is avoided at the corner of the side clamping surface 23.

[0053] When the ball-end insert 1 is axially installed, the upper clamping surface 21 fits with the upper end positioning surface 41 and the upper open positioning portion 42, the lower clamping surface 22 fits with the lower end positioning surface 51 and the lower open positioning portion 52, the side clamping surface 23 fits with the side positioning surface 6, and the locking screw 2 locks the ball-end insert 1 on the matching tool body 3 through the screw countersunk hole 19 and the screw through hole 7. The tool handle 20 is installed on the machine tool system. After locking, the tool rotates at high speed around the rotation axis B, and the tool can be used for cutting workpieces.

[0054] It should be noted that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments are only examples, and the embodiments having the same structure as the technical idea and exerting the same effect within the scope of the technical solution of the present invention are all included in the technical scope of the present invention. In addition, without departing from the scope of the main purpose of the present invention, various modifications that can be thought of by those skilled in the art to the embodiments and other methods of combining some of the constituent elements in the embodiments are also included in the scope of the present invention.

Claims

1. A ball-end tool with a limiting structure, characterized in that: include: A ball-end blade (1), wherein two working sides of the ball-end blade (1) respectively form a first main cutting edge (11) and a second main cutting edge (12); the first main cutting edge (11) and the second main cutting edge (12) extend toward an end different from the assembly direction of the ball-end blade (1) and intersect to form a blade tip (13); two assembly sides of the ball-end blade (1) respectively form an upper open positioning portion (42) and a lower open positioning portion (52); the upper open positioning portion (42) is adjacent to the second main cutting edge (12), and the lower open positioning portion (52) is adjacent to the first main cutting edge (11); portions of the two assembly sides of the ball-end blade (1) different from the upper open positioning portion (42) and the lower open positioning portion (52) penetrate each other to form a screw through hole (7); A matching knife body (3) comprises two knife clamps (18), a screw countersunk hole (19) and a knife handle (20), wherein the two knife clamps (18) are arranged oppositely and formed on the knife handle (20), the screw countersunk hole (19) is formed by two through holes that penetrate the two knife clamps (18) oppositely, one of the knife clamps (18) is provided with an upper limit portion (31) that fits with the upper open positioning portion (42), and the other knife clamp (18) is provided with a lower limit portion (32) that fits with the lower open positioning portion (52); A locking screw (2) is threadedly connected to the screw through hole (7) and the screw countersunk hole (19) respectively to make the ball head blade (1) and the matching blade body (3) cooperate with each other.

2. The ball-end tool with a limiting structure according to claim 1, characterized in that: The ball-end blade (1) comprises an upper surface (4), a lower surface (5) and a side circumferential surface (10), wherein the upper surface (4) and the lower surface (5) are connected and transitioned via the side circumferential surface (10), wherein the upper surface (4) comprises an upper end positioning surface (41), an upper open positioning portion (42) and a first rake surface (43) which mutually form a height difference, and wherein the lower surface (5) comprises a lower end positioning surface (51), a lower open positioning portion (52) and a second rake surface (53) which mutually form a height difference. ), the side peripheral surface (10) includes a side positioning surface (6), a first back angle surface (8) and a second back angle surface (9), the first back angle surface (8) is adjacent to the lower open positioning portion (52), the second back angle surface (9) is adjacent to the upper open positioning portion (42), the first main cutting edge (11) is formed by the intersection between the first front cutting surface (43) and the first back angle surface (8), and the second main cutting edge (12) is formed by the intersection between the second front cutting surface (53) and the second back angle surface (9).

3. The ball-end tool with a limiting structure according to claim 2, characterized in that: The upper open positioning portion (42) is a groove structure that is recessed inwardly relative to the upper end positioning surface (41); the lower open positioning portion (52) is a groove structure that is recessed inwardly relative to the lower end positioning surface (51); the upper limit portion (31) is a boss structure that fits with the upper open positioning portion (42); and the lower limit portion (32) is a boss structure that fits with the lower open positioning portion (52).

4. The ball-end tool with a limiting structure according to claim 2, characterized in that: The inner wall portion of the tool handle (20) located between the two tool clamps (18) is a side clamping surface (23), and the opposite surfaces of the two tool clamps (18) are an upper clamping surface (21) and a lower clamping surface (22), respectively. The side positioning surface (6) and the side clamping surface (23) can fit each other, and the intersection portions of the side clamping surface (23) with the upper clamping surface (21) and the lower clamping surface (22) are recessed toward the inside of the tool handle (20).

5. The ball-end tool with a limiting structure according to claim 1, characterized in that: The upper open positioning portion (42) comprises a small bevel (14) and a large bevel (15), wherein the small bevel (14) and the large bevel (15) intersect to form an intersection line (16), the extension line of the ball-end blade (1) passing through the blade tip (13) and parallel to the central axis of the matching blade body (3) is the central axis of the ball-end blade (1), the central axis of the screw through hole (7) is perpendicular to the central axis of the ball-end blade (1), the central axis of the screw through hole (7) and the extension line of the intersection line (16) form two projection lines on the radial plane of the central axis of the screw through hole (7), and an angle of α is formed between the two projection lines, and the angle α is 15° to 45°.

6. The ball-end tool with a limiting structure according to claim 1, characterized in that: The lower open positioning portion (52) includes a small bevel (14) and a large bevel (15), wherein the small bevel (14) and the large bevel (15) intersect to form an intersection line (16), and an extension line of the ball-end blade (1) passing through the blade tip (13) and parallel to the central axis of the matching blade body (3) is the central axis of the ball-end blade (1), and the central axis of the screw through hole (7) is perpendicular to the central axis of the ball-end blade (1), and the central axis of the screw through hole (7) and the extension line of the intersection line (16) form two projection lines on the radial plane of the central axis of the screw through hole (7), and an angle of α is formed between the two projection lines, and the angle α is 15° to 45°.

7. A ball-end tool with a limiting structure according to claim 5 or 6, characterized in that: The central axis of the ball-end blade (1) is used as a rotation axis, and the upper open positioning portion (42) and the lower open positioning portion (52) are rotationally symmetrical on the rotation axis.

8. A ball-end tool with a limiting structure according to claim 5 or 6, characterized in that: The central axis of the ball-end blade (1) is used as a rotation axis, and the first main cutting edge (11) and the second main cutting edge (12) are rotationally symmetrical on the rotation axis.

9. A ball-end tool with a limiting structure according to claim 5 or 6, characterized in that: In the direction of extension of the central axis from the screw through hole (7) to the knife tip (13), the large inclined surface (15) is inclined upward along this direction, and the inclination angle is 0.05° to 0.5°.

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