Rotary cutter

Abstract

The utility model relates to a rotary cutter which comprises a cutter main body which is provided with a main body central axis B for limiting the relative forward direction DF and the backward direction DR and can rotate around the main body central axis B in the rotating direction R, and a sub-cooling channel which is formed in the cutter main body and guides cooling liquid to a cutting area, the tool body further comprises a coolant storage chamber which is located on the upstream of the branch cooling channel and used for collecting cooling liquid, and a main cooling channel which is formed in the center of an adapter / tool handle used in cooperation with the tool body and used for directly allowing the cooling liquid to flow in. The secondary cooling channel is also formed in an adapter / cutter handle matched with the cutter main body for use, is positioned at the downstream of the primary cooling channel and is used for communicating the primary cooling channel with the coolant liquid storage chamber. The cooling agent storage chamber is arranged in the cutter body, so that the cutter bodies with different specifications have higher joint degree after being combined on the cutter head, and meanwhile, the sectional area is larger, so that the flowing of cooling liquid is facilitated.

Description

Technical Field

[0001] The utility model relates to a cutting tool, in particular to a light cutting tool. Background Art

[0002] During use, the rotary tool needs to be connected to the machine tool with the help of an adapter or a tool holder. During the processing, the tool and the workpiece will generate a lot of heat, and coolant needs to be introduced to cool the cutting part in time. For example, a Chinese invention patent with application number CN201711327017.8 "A detachable three-edged tool" (publication number CN108213535B) discloses a rotary tool. The tool as a whole consists of a replaceable tool disc, a mounting tray and a connecting handle. The mounting tray and the replaceable tool disc are connected by a tightening screw. The replaceable tool disc can be disassembled and replaced separately. An axial cooling channel is provided in the connecting handle, and a radial cooling channel is provided in the mounting tray. The radial cooling channel, the blade cooling channel and the annular cooling groove are connected in sequence and finally cool the blade.

[0003] This type of rotary tool realizes low-cost tool change after the tool is worn. Only the tool disc needs to be replaced and the rest can be reused, thereby reducing the cost of tool change. Holes of different depths can also be processed by replacing the tool disc to improve processing efficiency. In addition, hole processing generally needs to be divided into rough processing and fine processing, that is, the fine tool body and the rough tool body need to be installed on the tool disc respectively. Similar structures can refer to CN202322057916.8 "Tools for internal hole processing". Therefore, in addition to reducing the positioning error between single tool discs of different specifications and the mounting tray, it is also necessary to consider the positioning error between different fine tool bodies and rough tool bodies and the mounting tray.

[0004] In addition to considering the matching positioning error, it is also necessary to consider the degree of connection between the cooling channels in different combination states. Just like the cooling channel solution provided by the above-mentioned patent, the flow channels inside the cutter disc are designed to be thinner, that is, the cross-section is small. Although it is conducive to the high-speed spraying of coolant to improve the cooling effect, it is not conducive to the connection between the cooling channels in various combination states. Therefore, further improvements to the rotating tool are needed. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a rotary tool capable of realizing the connection degree between cooling channels of each cutter disc in different combination states in view of the above-mentioned existing technical status.

[0006] The technical solution adopted by the utility model to solve the above technical problems is: the rotary cutter comprises:

[0007] a tool body having a body central axis B defining a relative forward direction DF and a rearward direction DR, and said tool body being rotatable about said body central axis B in a rotational direction R;

[0008] A cooling channel is provided on the tool body and guides the coolant to the cutting area;

[0009] The feature is that the tool body also includes:

[0010] A coolant storage chamber, located upstream of the sub-cooling channel, for collecting coolant;

[0011] A primary cooling channel, located in the center of an adapter / tool ​​holder used with the tool body, for direct coolant flow; and

[0012] The secondary cooling channel is also provided on the adapter / tool ​​handle used in conjunction with the tool body, and is located downstream of the primary cooling channel, and is used to connect the primary cooling channel and the coolant storage chamber.

[0013] In order to facilitate the coolant in the secondary cooling channel to enter the coolant storage chamber, it is preferred that the cross-sectional area of ​​the coolant storage chamber is 300% to 500% larger than the cross-sectional area of ​​the inlet of the secondary cooling channel. The larger cross-sectional area of ​​the coolant storage chamber not only ensures that there is enough space in the coolant storage chamber for the coolant to flow from the main cooling channel on the adapter / tool ​​handle through the secondary cooling channel to the tool body and be collected to better flow to the sub-cooling channel, but also has the following effects: it is conducive to the connection between the cooling channel on the adapter / tool ​​handle and the sub-cooling channel on the tool for guiding the coolant to the cutting area, thereby improving the connection between the two.

[0014] In order to facilitate the clamping of the tool body and the adapter / handle, further, a screw is screwed into the center position of the front end side of the tool body, thereby clamping the tool body relative to the adapter / handle, and correspondingly, the tool body has a cavity for the screw to be screwed into, and the wall of the cavity is at least partially concave radially outward to form the coolant storage chamber. The formation of the cavity is not only conducive to the screwing in of the screw, but also conducive to the processing of the coolant storage chamber, which can be directly concave radially outward during processing.

[0015] In order to realize the participation of tool bodies of different specifications in processing on the tool disc, preferably, the tool body is divided into a rough tool body located at the rear and a fine tool body located at the front, and the fine tool body and the rough tool body can be replaced according to the processing requirements of the workpiece, and the coolant storage chamber is only opened on the fine tool body, and there is an annular cavity between the at least structure of the screw and the cavity, and the main cooling channel is connected to the annular cavity through the secondary cooling channel, and the rough tool body is directly cooled through the annular cavity. Among them, the design of the coolant storage chamber enables the fine tool body and the rough tool body of different specifications to be combined and installed, even if there is a certain positioning error, the connection between the cooling channels can still be achieved, and at the same time, the coolant can better cool the inner wall of the rough tool body when passing through the annular cavity.

[0016] In order to form a closed coolant flow channel, preferably, the screw includes a main body for forming the annular cavity with the cavity, and an extension portion located at the front end of the main body and extending radially outward, and the extension portion abuts against the front end side of the tool body to close the front end of the annular cavity. The coolant will be diverted at the end after passing through the main cooling channel, and the diverted coolant will enter each secondary cooling channel. Then the coolant will flow into the annular cavity between the outer wall of the screw and the inner wall of the tool body. The bottom of the annular cavity is abutted by the extension portion of the screw so that the coolant will not flow out from the bottom gap. At this time, the coolant enters the coolant storage chamber at the end of the annular cavity and is diverted to each sub-cooling channel. The coolant finally flows out from the end outlet of the sub-cooling channel.

[0017] Furthermore, the cross section of the main body is in an inverted "T" shape, including a vertical section and a transverse section for enclosing an annular cavity, and the extension is located at the front end of the transverse section. The screw not only achieves the clamping of the tool body and the adapter / tool ​​handle, but also has the following functions: the gap enclosed by the outer wall of the transverse section and the inner wall of the tool body forms an annular cavity for the coolant to flow, which can achieve cooling of the tool body; the extension abuts against the end of the annular cavity so that the coolant will not flow out from the bottom gap, that is, it can only enter the coolant storage chamber from the only channel (i.e., the annular cavity).

[0018] In order to realize how the screw is surrounded to form an annular cavity space, the tool design is considered as follows: the cavity on the tool body is surrounded by an annular inner step, including a first wall surface located above the step and a second wall surface located below the step, a central hole for the vertical section to pass through is opened in the center of the first wall surface, and the rear end of the transverse section abuts against the first wall surface to close the rear end of the annular cavity, and the gap between the side circumferential wall of the transverse section and the second wall surface constitutes the space area of ​​the annular cavity. Among them, the vertical section of the screw extends backward from the central hole to the inside of the adapter, the top of the vertical section abuts against the adapter / tool ​​handle, the upper circumferential surface of the transverse section of the screw abuts against the second wall surface of the annular inner step, and the gap between the side circumferential wall of the transverse section and the second wall surface is an annular cavity space for the coolant in the secondary cooling channel to flow into.

[0019] Compared with the prior art, the advantages of the utility model are:

[0020] 1. A coolant storage chamber is set upstream of the sub-cooling channel that guides the coolant to the cutting area in the tool body, which can directly improve the connection between the cooling channels when replacing tools of different specifications or even combining rough and fine tool bodies;

[0021] 2. The cross-sectional area of ​​the coolant storage chamber is relatively large, which can improve the fluidity of the coolant flowing to the cooling channel, while also reducing friction and improving the stability of the tool combination during processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of an embodiment of the utility model;

[0023] Figure 2 It is an exploded schematic diagram of an embodiment of the utility model;

[0024] Figure 3 This is an exploded schematic diagram of the fine cutter body and the screw in the embodiment of the utility model;

[0025] Figure 4 It is a longitudinal cross-sectional schematic diagram in an embodiment of the utility model;

[0026] Figure 5 It is a cross-sectional schematic diagram of an embodiment of the utility model;

[0027] Figure 6 It is a longitudinal cross-sectional schematic diagram of an embodiment of the utility model (with hidden screws).

[0028] In the figure: 1. tool body; 11. fine tool body; 12. rough tool body; 13. cavity; 131. first wall; 132. second wall; 133. central hole; 2. screw; 21. main body; 211. transverse section; 212. vertical section; 22. extension; 3. main cooling channel; 4. sub-cooling channel; 5. secondary cooling channel; 6. coolant storage chamber; 7. annular cavity; 8. adapter. DETAILED DESCRIPTION

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0030] like Figures 1 to 6 The rotary tool can be any type of rotary cutting tool, such as a boring bar, a drill bit, etc., and the adapter 8 used with the rotary cutting tool can also be any type of adapter 8, such as a non-tapered or cylindrical adapter.

[0031] The rotary tool of the present embodiment includes a tool body 1 having a main body central axis B defining a relative forward direction DF and a rearward direction DR, and the tool body 1 can rotate around the main body central axis B in a rotation direction R, and a sub-cooling channel 4 provided on the tool body 1 and guiding the coolant to the cutting area, the tool body 1 also includes a coolant storage chamber 6 located upstream of the sub-cooling channel 4 and for collecting the coolant, and also includes an adapter / tool ​​handle provided for use with the tool body 1. The present embodiment is explained by taking the adapter 8 as an example, the main cooling channel 3 in the center of the adapter 8 and directly for the coolant to flow in, and the secondary cooling channel 5 located downstream of the main cooling channel 3, the secondary cooling channel 5 being used to connect the main cooling channel 3 and the coolant storage chamber 6. Among them, the applicant needs to emphasize that the coolant storage chamber 6 not only has a certain literally defined "liquid storage" function, but also has a more important function of improving the degree of engagement with the secondary cooling channel 5 of the adapter 8. For specific structure reference Figure 4 and Figure 6 As shown, the cross-sectional area of ​​the coolant storage chamber 6 is 300% to 500% larger than the cross-sectional area of ​​the inlet of the secondary cooling channel 5. In addition to ensuring that there is enough space in the coolant storage chamber 6 for the coolant to flow from the main cooling channel 3 of the adapter 8 through the secondary cooling channel 5 to the tool body 1 and to be collected so as to better flow to the sub-cooling channel 4, the larger cross-sectional area of ​​the coolant storage chamber 6 also has the following functions: it is conducive to the connection between the cooling channel on the adapter 8 and the sub-cooling channel 4 on the tool for guiding the coolant to the cutting area, thereby improving the connection between the two. In this embodiment, on the basis of ensuring the connection, for the convenience of processing, the cross-sectional area of ​​the coolant storage chamber 6 is designed to be 300% larger than the cross-sectional area of ​​the inlet of the secondary cooling channel 5.

[0032] In addition, as mentioned above, during the hole processing process, the tool body 1 needs to be replaced after being worn, or the tool body 1 of different specifications needs to be replaced under the premise of processing holes of different depths. Then, it is very important to clamp the replaced tool body 1 and the adapter 8. Therefore, the following method is adopted: Figures 2 to 4 The screw 2 is screwed into the center of the front end side of the tool body 1, thereby clamping the tool body 1 relative to the adapter 8. Correspondingly, the tool body 1 has a cavity 13 for the screw 2 to be screwed into, and the wall of the cavity 13 is at least partially recessed radially outward to form the coolant storage chamber 6. The formation of the cavity 13 is also conducive to the processing of the coolant storage chamber 6, which can be directly recessed radially outward.

[0033] In addition to replacing the tool body 1 of different specifications, it is also possible to use a rough tool body 12 and a fine tool body 11 of different specifications to more accurately process the hole. Figure 2 and Figure 4 The tool body 1 is divided into a roughing tool body 12 located at the rear and a fine tool body 11 located at the front. The fine tool body 11 and the roughing tool body 12 can be replaced according to the processing requirements of the workpiece, that is, the tool bodies of different specifications can be installed on the cutter head to process the workpiece in multiple sizes. The coolant storage chamber 6 is only provided on the fine tool body 11. There is an annular cavity 7 between the at least structure of the screw 2 and the cavity 13. The main cooling channel 3 is connected with the annular cavity 7 through the secondary cooling channel 5, and the roughing tool body 12 is directly cooled through the annular cavity 7. The screw 2 includes a main body 21 for forming an annular cavity 7 with the cavity 13, and an extension portion 22 located at the front end of the main body 21 and extending radially outward. The extension portion 22 abuts against the front end side of the tool body 1 to close the front end of the annular cavity 7. The cross section of the main body 21 is an inverted "T" shape, including a vertical section 212 and a transverse section 211 for surrounding the annular cavity 7. The extension portion 22 is located at the front end of the transverse section 211. In addition, refer to Figure 4 and Figure 6The cavity 13 on the tool body 1 is surrounded by an annular inner step, including a first wall surface 131 located above the step and a second wall surface 132 located below the step. A central hole 133 is provided in the center of the first wall surface 131 for the vertical section 212 to pass through, and the rear end of the transverse section 211 abuts against the first wall surface 131 to close the rear end of the annular cavity 7, and the gap between the side circumferential wall of the transverse section 211 and the second wall surface 132 constitutes the space area of ​​the annular cavity 7. Among them, the vertical section 212 of the screw 2 extends backward from the central hole 133 to the inside of the adapter 8, the top of the vertical section 212 abuts against the adapter 8, the upper circumferential surface of the transverse section 211 of the screw 2 abuts against the second wall surface 132 of the annular inner step, and the gap between the side circumferential wall of the transverse section 211 and the second wall surface 132 is the space of the annular cavity 7 for the coolant in the secondary cooling channel 5 to flow into. Among them, the screw 2 not only realizes the clamping of the tool body 1 and the adapter 8, but also has the following functions: the gap jointly enclosed by the outer wall of the transverse section 211 and the inner wall of the tool body forms an annular cavity 7 for the circulation of coolant, and the coolant can cool the inner wall of the rough tool body 12 when flowing inside the annular cavity 7; the extension portion 22 abuts against the end of the annular cavity 7 so that the coolant will not flow out from the bottom gap, that is, it can only enter the coolant storage chamber 6 from the only channel (i.e., the annular cavity 7). In this way, the design of the coolant storage chamber 6 makes it possible to achieve the connection between the cooling channels even if there is a certain positioning error after the fine tool body 11 and the rough tool body 12 of different specifications are assembled and installed. At the same time, when the coolant enters the annular cavity 7 from the secondary cooling channel 5, the coolant can better cool the inner wall of the rough tool body 12. The coolant will be diverted at the end after passing through the main cooling channel 3, and the diverted coolant enters each secondary cooling channel 5. Then the coolant converges into the annular cavity 7 between the outer wall of the screw 2 and the inner wall of the tool body. The bottom of the annular cavity 7 is abutted by the extension portion 22 of the screw 2 so that the coolant will not flow out from the bottom gap. At this time, the coolant enters the coolant storage chamber 6 at the end of the annular cavity 7 and is diverted to each sub-cooling channel 4. The coolant finally flows out from the end outlet of the sub-cooling channel 4.

[0034] To sum up, the specific working process of the rotary tool is as follows: during the machining process, a large amount of heat will be generated between the cutting area of ​​the cutting edge and the workpiece. At this time, coolant needs to be introduced into the main cooling channel 3 of the adapter 8. The coolant is branched at the end of the main cooling channel 3 and enters each secondary cooling channel 5 at the same time. The coolant flows axially in the secondary cooling channel 5 and then merges into the annular cavity 7 between the tool body 1 and the screw 2. The coolant flowing in the annular cavity 7 can cool the inner wall of the tool body 1. After the coolant flows to the end of the annular cavity 7, it will enter the coolant storage chamber 6 through the inlet. The coolant in the coolant storage chamber 6 is branched and enters each sub-cooling channel 4, and finally flows out through the outflow outlet at the end of the sub-cooling channel 4 to cool and lubricate the corresponding cutting edge.

[0035] The rough cutter body 12 and the fine cutter body 11 on the rotary cutter can be provided with cutting edges at intervals in the same number, and the sum of the numbers of the two can be an even number. The preferred number of cutting edges in this embodiment is 16, of which 8 are rough cutting edges provided on the rough cutter body 12, and the other 8 are fine cutting edges provided on the fine cutter body 11. In order to ensure the cooling effect of each cutting edge, the preferred number of sub-cooling channels 4 in this embodiment is 16, each sub-cooling channel 4 corresponds to a cutting edge, and each sub-cooling channel 4 is radially opened along the coolant storage chamber 6. The upstream of the coolant storage chamber 6 is an annular cavity 7, and connected to the upstream of the annular cavity 7 are 4 secondary cooling channels 5 extending in the axial direction. A main cooling channel 3 is provided in the adapter 8, and the secondary cooling channel 5 is connected to the downstream of the main cooling channel 3.

Claims

1. A rotary tool comprising: A tool body (1) having a body central axis (B) defining a relative forward direction (DF) and a rearward direction (DR), and the tool body (1) is rotatable about the body central axis (B) in a rotational direction (R); A cooling channel (4) is provided on the tool body (1) and guides the coolant to the cutting area; Features: The tool body (1) also includes: A coolant storage chamber (6), located upstream of the sub-cooling channel (4), for collecting coolant; A main cooling channel (3) is provided in the center of an adapter / tool ​​holder used in conjunction with the tool body (1) and is directly accessible to coolant; as well as The secondary cooling channel (5) is also provided on an adapter / tool ​​handle used in conjunction with the tool body (1), and is located downstream of the primary cooling channel (3), and is used to connect the primary cooling channel (3) and the coolant storage chamber (6).

2. The rotary tool according to claim 1, characterized in that: The cross-sectional area of ​​the coolant storage chamber (6) is 300% to 500% larger than the cross-sectional area of ​​the inlet of the secondary cooling channel (5).

3. The rotary tool according to claim 2, characterized in that: A screw (2) is screwed into the center position of the front end side of the tool body (1), thereby clamping the tool body (1) relative to the adapter / tool ​​handle. Correspondingly, the tool body (1) has a cavity (13) for the screw (2) to be screwed into, and the wall of the cavity (13) is at least partially recessed radially outward to form the coolant storage chamber (6).

4. The rotary tool according to claim 3, characterized in that: The tool body (1) is divided into a roughing body (12) located at the rear and a fine cutting body (11) located at the front. The coolant storage chamber (6) is only provided on the fine cutting body (11). An annular cavity (7) is provided between at least the structure of the screw (2) and the cavity (13). The main cooling channel (3) is connected to the annular cavity (7) via the secondary cooling channel (5), and the roughing body (12) is directly cooled via the annular cavity (7).

5. The rotary tool according to claim 4, characterized in that: The screw (2) comprises a main body (21) for forming the annular cavity (7) together with the cavity (13), and an extension portion (22) located at the front end of the main body (21) and extending radially outward, wherein the extension portion (22) abuts against the front end side of the tool body (1) to close the front end of the annular cavity (7).

6. The rotary tool according to claim 5, characterized in that: The cross section of the main body (21) is in an inverted "T" shape, comprising a vertical section (212) and a transverse section (211) for enclosing the annular cavity (7), and the extension portion (22) is located at the front end of the transverse section (211).

7. The rotary tool according to claim 6, characterized in that: The cavity (13) on the tool body (1) is surrounded by an annular inner step, and includes a first wall surface (131) located above the step and a second wall surface (132) located below the step. A central hole (133) is provided in the center of the first wall surface (131) for the vertical section (212) to pass through. The rear end of the transverse section (211) abuts against the first wall surface (131) to close the rear end of the annular cavity (7), and the gap between the side wall of the transverse section (211) and the second wall surface (132) constitutes the spatial area of ​​the annular cavity (7).

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