Rotary cutter

Abstract

The utility model relates to a rotary cutter, which comprises a cutter main body with a main body central axis B for limiting a forward direction DF and a backward direction DR, and the cutter main body can rotate around the main body central axis B in a rotation direction R; the tool body comprises a cutting head, the cutting head extends outwards in the radial direction of the central axis B of the tool body to form a tool rest, a containing part is arranged on the tool rest, a cutting edge is arranged on the cutting seat, a sub-cooling channel is further arranged on the tool rest, and the cutting seat can move in the axial direction and / or the radial direction. The cutter main body comprises a first coolant joint chamber, and the sectional area of the first coolant joint chamber is larger than that of an inflow port of the sub-cooling channel; and a second coolant joining chamber having a larger cross-sectional area than the outflow port of the sub-cooling channel. The first coolant joint chamber and the second coolant joint chamber are arranged, accurate cooling can still be achieved when the cutting edge is adjusted, meanwhile, the linear speed and the hydraulic pressure of the coolant outlet are larger, and the cooling area is increased.

Description

Technical Field

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

[0002] Workpieces usually have different requirements for precision during the machining process. In order to meet the machining requirements of the workpiece, the cutting tool needs to adjust the positioning of the cutting edge accordingly to ensure the optimal machining size of the workpiece hole. For example, a Chinese utility model patent "Adjustable roughing and finishing milling cutter disc" (publication number CN202639466U) with application number CN201220173731.2 discloses a cutting tool, which is connected to an adapter through screws, and an axial adjustment mechanism and a radial adjustment mechanism are provided on the tool body. A main cooling channel is opened inside the tool body, and the diverter holes on the main cooling channel guide the coolant to each cutting edge.

[0003] This type of tool can meet the processing requirements of different workpieces by adjusting the radial and axial adjustment screws, thereby improving the processing accuracy. However, at the same time, a new problem arises: the cooling hole opened inside the tool body is fixed in position. When the cutting edge is adjusted in the axial or radial positioning size, the coolant outlet cannot achieve accurate cooling due to the relative position change with the cutting edge, resulting in poor cooling effect. Therefore, further improvements to the rotary tool are needed. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a rotary tool which can finely adjust the cutting edge size and still achieve precise cooling in view of the above-mentioned existing technical status.

[0005] The technical solution adopted by the utility model to solve the above technical problems is: the rotary cutter comprises:

[0006] 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;

[0007] The tool body comprises:

[0008] A cutting head, wherein a tool holder is extended radially outwardly along the central axis B of the main body, and a receiving portion for receiving a cutting seat is provided on the tool holder, a cutting edge is provided on the cutting seat, and a sub-cooling channel for guiding a coolant to a cutting area on the cutting seat is provided on the tool holder, and the cutting seat can move axially and / or radially relative to the receiving portion;

[0009] It is characterized in that: the tool body also includes a first coolant connecting chamber located upstream of the sub-cooling channel and a second coolant connecting chamber located downstream of the sub-cooling channel, the cross-sectional area of ​​the first coolant connecting chamber is larger than the inlet of the sub-cooling channel, and the cross-sectional area of ​​the second coolant connecting chamber is larger than the outlet of the sub-cooling channel.

[0010] In order to realize the connection between the sub-cooling channel and the guide channel, preferably, the second coolant connection chamber is opened inside the cutting seat and is enclosed together with at least the wall of the tool holder. One end of the second coolant connection chamber is the flow outlet at the end of the sub-cooling channel, and the other end is the flow inlet of the guide channel leading to the cutting edge. The inner wall of the cutting seat and the outer wall of the tool holder are close together to form a chamber for the circulation of coolant.

[0011] For the convenience of processing, the second coolant joint chamber is preferably a groove body opened inside the cutting seat and enclosed together with the wall of the tool holder. The second coolant joint chamber is formed by the inner wall of the cutting seat radially outwardly, and the open end of the groove body is enclosed by the wall of the tool holder.

[0012] In order to achieve precise cooling of the cutting edge in the adjustment state, preferably, the cutting seat is provided with an adjustment module for adjusting the position of the cutting edge, and the adjustment module can drive the cutting seat to move axially or radially in the accommodating portion under the drive of an external force, and at least a portion of the second coolant engagement chamber can move with the cutting seat and always maintain engagement with the outflow port and the second guide channel. The adjustment module on the cutting seat can adjust the cutting edge axially or radially according to the processing requirements of different workpieces. During the positioning and adjustment of the cutting edge, at least a portion of the second coolant engagement chamber moves with the cutting seat, so that the outflow port of the scoring cooling channel and the guide channel can always remain engaged, thereby ensuring precise cooling of the cutting edge.

[0013] In order to realize the combination of tool bodies of different specifications on the tool disc to participate in the processing, as a preferred embodiment, 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 first coolant joint chamber is only opened on the fine tool body. The rough tool body is used for rough processing of the workpiece, and the fine tool body is used for fine processing of the workpiece. The fine tool body and the rough tool body can be replaced according to the processing requirements of the workpiece. The design of the first coolant joint 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 cooling channels can still be joined.

[0014] In order to facilitate the clamping of the tool body and the adapter / tool ​​handle, further, a screw is screwed into the corresponding central position of the tool body, thereby clamping the rough tool body and the fine tool body relative to the adapter / tool ​​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 first coolant joint 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 first coolant joint chamber, which can be directly concave radially outward.

[0015] In order to ensure the rigidity of the tool body, preferably, a longitudinal guide channel coaxial with the central axis B of the main body is formed between the screw and the rough tool body, so that the coolant is guided from the back to the front to the first coolant joint chamber. The longitudinal guide channel is a gap formed between the screw and the rough tool body, and the gap becomes a longitudinal guide channel connecting the main cooling channel and the first coolant joint chamber. The function of the channel is to avoid the opening of the longitudinal channel inside the tool body, thereby ensuring the rigidity of the tool body to a certain extent, and at the same time, the coolant can be guided into the first coolant joint chamber.

[0016] In order to facilitate the guiding of the coolant, preferably, the screw or the adapter / tool ​​handle is provided with a main cooling channel connected to the longitudinal guide channel. The coolant is introduced from the outlet of the main cooling channel and flows into the longitudinal guide channel at the end of the main cooling channel. The coolant enters the first coolant joint chamber under the guidance of the longitudinal guide channel.

[0017] In order to form a closed coolant channel, preferably, the screw also includes a front end that can abut against the front end side of the fine tool body to close the front end of the longitudinal guide channel. After the coolant passes through the end of the main cooling channel, it will flow into the longitudinal guide channel between the outer wall of the screw and the inner wall of the tool body. The bottom of the longitudinal guide channel is abutted by the front end of the screw so that the coolant will not flow out from the bottom gap. At this time, the coolant enters the first coolant joint chamber at the end of the longitudinal guide channel and is divided into each sub-cooling channel. The coolant finally flows into the guide channel from the end outlet of the sub-cooling channel and finally cools the cutting edge.

[0018] In order to achieve better cooling of the cutting edge, preferably, the cutting edge includes a finishing cutting edge and a rough cutting edge; the sub-cooling channel includes a first sub-cooling channel and a second sub-cooling channel, the coolant in the first sub-cooling channel cools the finishing cutting edge through the outlet of the guide channel, and the coolant in the second sub-cooling channel cools the rough cutting edge through the outlet of the guide channel. The finishing cutting edge can meet the finishing requirements of the workpiece, and the rough cutting edge can meet the roughing requirements of the workpiece. The finishing cutting edge and the rough cutting edge are arranged in sequence on the cutting head, each first sub-cooling channel corresponds to a finishing cutting edge, and each second sub-cooling channel corresponds to a rough cutting edge, that is, each sub-cooling channel cools the corresponding cutting edge separately, so that the cutting part of each cutting edge can be better cooled.

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

[0020] 1. When the cutting edge is in the positioning and adjustment state, the designed second coolant joint chamber can be used to make the coolant outflow outlet in the center of the main body and the guide channel leading to the cutting area join, thereby achieving precise cooling;

[0021] 2. A second coolant connection chamber and a first coolant connection chamber are provided inside the tool body, and both are eccentrically arranged relative to the central axis B of the main body. Since the rotation radius of the second coolant connection chamber and the first coolant connection chamber is large, during the high-speed rotation of the rotary tool, the coolant can have a higher flow rate and hydraulic pressure, thereby making the cooling range of the coolant flowing out from the end of the cooling channel larger. 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 a cross-sectional schematic diagram of an embodiment of the utility model;

[0024] Figure 3 Another cross-sectional schematic diagram of an embodiment of the utility model;

[0025] Figure 4 A longitudinal cross-sectional schematic diagram of an embodiment of the utility model;

[0026] Figure 5 for Figure 4 A magnified schematic diagram of the local structure;

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

[0028] Figure 7 for Figure 6 A magnified schematic diagram of the local structure;

[0029] Figure 8 This is a schematic diagram of the three-dimensional structure of the cutting seat in the embodiment of the utility model;

[0030] Fig. 9 It is a schematic diagram of the three-dimensional structure of the cutting seat in another direction in the embodiment of the utility model.

[0031] In the figure: 1. tool body; 11. fine tool body; 12. rough tool body; 121. longitudinal guide channel; 2. cutting head; 21. cutting seat; 3. tool holder; 31. accommodating portion; 32. second coolant connection chamber; 4. cutting edge; 41. fine cutting edge; 42. rough cutting edge; 5. main cooling channel; 6. sub-cooling channel; 61. first sub-cooling channel; 62. second sub-cooling channel; 7. guide channel; 8. first coolant connection chamber; 9. screw; 10. adapter. DETAILED DESCRIPTION

[0032] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0033] Example 1

[0034] like Figures 1 to 9 The rotary tool can be any type of rotary cutting tool, such as a boring bar, a drill bit, etc., and the adapter 10 used with the rotary cutting tool can also be any type of adapter 10, such as a non-tapered or cylindrical adapter.

[0035] The rotary tool of this embodiment includes a tool body 1 having a main body center axis B that defines a relative forward direction DF and a rearward direction DR, and the tool body 1 can rotate around the main body center axis B in a rotation direction R; the tool body 1 includes a cutting head 2, and the cutting head 2 has a tool holder 3 extending radially outward along the main body center axis B, and a receiving portion 31 for accommodating a cutting seat 21 is provided on the tool holder 3, and a cutting edge 4 is provided on the cutting seat 21. The tool holder 3 is also provided with a sub-cooling channel 6 for guiding coolant to the cutting area on the cutting seat 21, and the cutting seat 21 can move axially and / or radially relative to the receiving portion 31; the tool body 1 also includes a first coolant coupling chamber 8 located upstream of the sub-cooling channel 6 and a second coolant coupling chamber 32 located downstream of the sub-cooling channel 6, the cross-sectional area of ​​the first coolant coupling chamber 8 is larger than the inlet of the sub-cooling channel 6, and the cross-sectional area of ​​the second coolant coupling chamber 32 is larger than the outlet of the sub-cooling channel 6.

[0036] During the hole processing process, different workpieces or different parts of the workpiece have different processing requirements for the hole diameter. In order to meet different processing requirements, the cutting seat 21 is provided with an adjustment module for adjusting the position of the cutting edge 4 (refer to Figure 8 and Fig. 9 ), the adjustment module can drive the cutting seat 21 to move axially or radially in the receiving portion 31 under the drive of external force. Considering that the cutting edge 4 will be offset from the cooling channel outlet during the positioning adjustment process, reference Figure 3 and Figure 4 In the present application, a second coolant joint chamber 32 is provided inside the cutting seat 21, and is formed together with at least the wall of the tool holder 3. One end of the second coolant joint chamber 32 is the outlet of the end of the sub-cooling channel 6, and the other end is the inlet of the guide channel 7 leading to the cutting edge 4. The inner wall of the cutting seat 21 and the outer wall of the tool holder 3 are fitted together to form a chamber for the circulation of coolant. During the positioning and adjustment process of the cutting edge 4, at least part of the second coolant joint chamber 32 moves with the cutting seat 21, so that the outlet of the sub-cooling channel 6 and the guide channel 7 can always remain engaged, thereby ensuring the precise cooling of the cutting edge 4. Reference Figure 4 and Fig. 9 In order to facilitate processing, the second coolant joint chamber 32 is formed by the inner wall of the cutting seat 21 opening radially outward, and the open end of the groove body is surrounded by the wall of the tool holder 3.

[0037] Since the tool body 1 needs to be used with an adapter / tool ​​handle during the processing, this embodiment is described by taking the adapter 10 as an example. A screw 9 is screwed into the corresponding center position of the tool body 1, thereby clamping the rough tool body 12 and the fine tool body 11 relative to the adapter 10. Correspondingly, the tool body 1 has a cavity for screwing the screw 9 into (refer to Figure 6 ), the role of the cavity is not only to provide a space for screwing in the screw 9, but also to facilitate the processing of the first coolant joint chamber 8. The first coolant joint chamber 8 is formed by the wall of the cavity being at least partially recessed radially outward, that is, it is directly processed radially outward in the cavity. A rough cutter body 12 and a fine cutter body 11 are provided on the cutter disc, which are used for rough machining and fine machining of the workpiece respectively. The fine cutter body 11 and the rough cutter body 12 can be replaced according to the processing requirements of the workpiece, that is, cutter bodies of different specifications can be installed on the cutter disc to participate in the processing. Positioning errors are prone to occur after different cutter bodies are combined, which makes it impossible for the cooling channels set on different cutter bodies to be joined. The first coolant joint chamber 8 in the present application is opened on the fine cutter body 11. The cross-sectional area of ​​the first coolant joint chamber 8 is larger than the cross-sectional area of ​​the cooling channel on the cutter body. Even if there is a certain positioning error after the fine cutter bodies 11 and the rough cutter bodies 12 of different specifications are installed in combination, the cooling channels can still be joined.

[0038] In addition, before the coolant is involved in cooling, it needs to be introduced from the entrance of the main cooling channel 5. The main cooling channel 5 is opened on the screw 9 and merges into the longitudinal guide channel 121 at the end of the main cooling channel 5. The coolant enters the first coolant joint chamber 8 under the guidance of the longitudinal guide channel 121. Among them, a longitudinal guide channel 121 coaxial with the main body center axis B is formed between the screw 9 and the rough cutter body 12. The longitudinal guide channel 121 is a gap formed between the screw 9 and the rough cutter body 12 (refer to Figure 4 ), the gap becomes a longitudinal guide channel 121 connecting the main cooling channel 5 and the first coolant joining chamber 8, avoiding the opening of the longitudinal channel inside the tool body 1, thereby ensuring the rigidity of the tool body 1 to a certain extent, and at the same time guiding the coolant to the first coolant joining chamber 8. The screw 9 also includes a front end that can abut against the front end side of the fine tool body 11 to close the longitudinal guide channel 121. The bottom of the longitudinal guide channel 121 is abutted by the front end of the screw 9 so that the coolant does not flow out from the bottom gap. At this time, the coolant enters the first coolant joining chamber 8 at the end of the longitudinal guide channel 121 and is diverted to each sub-cooling channel 6. The coolant finally flows from the end outlet of the sub-cooling channel 6 to the guide channel 7, and finally cools the cutting edge 4. Reference Figures 1 to 3 The cutting edge 4 includes a fine cutting edge 41 and a rough cutting edge 42; the fine cutting edge 41 is arranged on the fine tool body 11, and the rough cutting edge 42 is arranged on the rough tool body 12, and the sub-cooling channel 6 includes a first sub-cooling channel 61 and a second sub-cooling channel 62. The coolant in the first sub-cooling channel 61 cools the fine cutting edge 41 through the outlet of the guide channel 7, and the coolant in the second sub-cooling channel 62 cools the rough cutting edge 42 through the outlet of the guide channel 7, so that the cutting part of each cutting edge 4 can be better cooled.

[0039] To sum up, the specific working process of the rotary tool is as follows: during the machining process of the rotary tool, a large amount of heat will be generated between the cutting area of ​​the cutting edge 4 and the workpiece. At this time, coolant needs to be introduced into the entrance of the main cooling channel 5 of the tool body 1. The coolant flows through the end of the main cooling channel 5 and then merges into the longitudinal guide channel 121. After the coolant flows to the end of the longitudinal guide channel 121, it flows radially into the first coolant junction chamber 8. The coolant in the first coolant junction chamber 8 is diverted and then passed into each sub-cooling channel 6. The coolant in the first sub-cooling channel 61 passes through the second coolant junction chamber 32 and the guide channel 7 and flows out from the outlet of the end face of the cutting head 2 to cool and lubricate the fine cutting edge 41; the coolant in the second sub-cooling channel 62 passes through the second coolant junction chamber 32 and the guide channel 7 and flows out from the outlet of the end face of the cutting head 2 to cool and lubricate the rough cutting edge 42. When the adjusting module performs positioning and dimension adjustment on the cutting edge 4, the second coolant connection chamber 32 always keeps the connection between the sub-cooling channel 6 and the guide channel 7, so that the cutting edge 4 can always be accurately cooled.

[0040] Example 2

[0041] The only difference between this embodiment and embodiment 1 is that the main cooling channel 5 of the tool body 1 is provided on the adapter / tool ​​handle. This embodiment is explained by taking the adapter 101 as an example. No cooling channel is provided on the screw 9. The main cooling channel 5 of the adapter 10 is provided with a secondary cooling channel for guiding the coolant to the longitudinal guide channel 121. The secondary cooling channel can take various forms, such as being provided obliquely along the main cooling channel 5 or being provided radially outward from the main cooling channel 5 and then extending axially to be provided in the longitudinal guide channel 121. The remaining structures in the tool body 1 are consistent with those in embodiment 1.

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); The tool body (1) comprises: A cutting head (2), the cutting head (2) having a tool holder (3) extending radially outwardly along the central axis (B) of the main body, and a receiving portion (31) for receiving a cutting seat (21) is provided on the tool holder (3), the cutting seat (21) is provided with a cutting edge (4), and the tool holder (3) is also provided with a sub-cooling channel (6) for guiding cooling liquid to a cutting area on the cutting seat (21), and the cutting seat (21) can move axially and / or radially relative to the receiving portion (31); Features: The tool body (1) also includes a first coolant joining chamber (8) located upstream of the sub-cooling channel (6) and a second coolant joining chamber (32) located downstream of the sub-cooling channel (6), the cross-sectional area of ​​the first coolant joining chamber (8) being larger than the inlet of the sub-cooling channel (6), while the cross-sectional area of ​​the second coolant joining chamber (32) being larger than the outlet of the sub-cooling channel (6).

2. The rotary tool according to claim 1, characterized in that: The second coolant connection chamber (32) is opened inside the cutting seat (21) and is at least formed together with the wall of the tool holder (3).

3. The rotary tool according to claim 2, characterized in that: The second coolant joint chamber (32) is a groove body opened inside the cutting seat (21) and is formed together with the wall of the tool holder (3).

4. The rotary tool according to claim 3, characterized in that: The cutting seat (21) is provided with an adjustment module for adjusting the position of the cutting edge (4); the adjustment module can drive the cutting seat (21) to move axially or radially within the accommodating portion (31) under the drive of an external force; at least a portion of the second coolant engagement chamber (32) can move with the cutting seat (21) and always maintain engagement with the outflow port and the guide channel (7).

5. The rotary cutter according to claim 3 or 4, characterized in that: The tool body (1) is divided into a rough tool body (12) located at the rear and a fine tool body (11) located at the front, and the first coolant joining chamber (8) is only provided on the fine tool body (11).

6. The rotary tool according to claim 5, characterized in that: A screw (9) is screwed into the corresponding central position of the tool body (1), thereby clamping the rough tool body (12) and the fine tool body (11) relative to the adapter / tool ​​holder.

7. The rotary tool according to claim 6, characterized in that: A longitudinal guide channel (121) coaxial with the central axis (B) of the main body is formed between the screw (9) and the rough cutter body (12), so that the coolant is guided from back to front to the first coolant joint chamber (8).

8. The rotary tool according to claim 7, characterized in that: The screw (9) or the adapter / tool ​​handle is provided with a main cooling channel (5) which is in communication with the longitudinal guide channel (121).

9. The rotary tool according to claim 8, characterized in that: The screw (9) also includes a front end that can abut against the front end side of the fine knife body (11) to close the longitudinal guide channel (121).

10. The rotary cutter according to claim 1, characterized in that: The cutting edge (4) comprises a finishing cutting edge (41) and a rough cutting edge (42); the sub-cooling channel (6) comprises a first sub-cooling channel (61) and a second sub-cooling channel (62); the coolant in the first sub-cooling channel (61) cools the finishing cutting edge (41) through an outlet of a guide channel (7), and the coolant in the second sub-cooling channel (62) cools the rough cutting edge through an outlet of the guide channel (7).

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