Rotary cutter

Abstract

The utility model relates to a rotary cutter, which comprises a cutter main body, the cutter main body is provided with a main body central axis B for limiting a relative forward direction DF and a relative backward direction DR, and the cutter main body can rotate around the main body central axis B in a rotating direction R; the front end side of the screw is screwed into the corresponding center position of the cutter body so that the adapter / cutter handle and the cutter body can be clamped, the cutter body is provided with a cavity for the screw to be screwed in, and an annular cavity is formed between the screw and the cavity and used for being communicated with fluid of the adapter / cutter handle; the main cooling channel is formed in the center of the screw and directly communicated with a cooling channel on an adapter / cutter handle, the secondary cooling channel is formed in the periphery of the screw, and the sub-cooling channel is formed in the cutter body, guided to a cutting area and further communicated with the annular cavity. The cooling channel and the cutter body of the cutter are independently machined, the steps are convenient, and meanwhile the cutter body can be well cooled through the annular cavity.

Description

Technical Field

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

[0002] During the machining process, friction will occur between the high-speed rotating cutting edge of the rotary tool and the workpiece, thereby generating a large amount of heat load. In order to eliminate the excess heat load, a cooling channel needs to be set in the rotary tool, and the coolant in the cooling channel is used to lubricate and cool the cutting edge. A more common cooling structure is to set multiple coolant holes in the cutter head, and the coolant is guided to the cutting edge of the cutter head. For example, the diversion hole leading to the blade disclosed in the Chinese utility model patent "Adjustable Roughing and Finishing Milling Cutter Disc" (Announcement No. CN202639466U) belongs to this type of coolant hole. In addition to the cutter head, the rotary tool generally includes a large-diameter adapter or a tool handle, and a channel for conveying coolant is set on the adapter or the tool handle, and combined with the coolant hole on the cutter head, the coolant is finally guided to the cutting edge of the cutter head. This type of tool structure can be referred to DE4019506A1. The tool needs to fix the rotary tool with the help of a screw, and the screw is screwed into the corresponding center position of the cutter head on the front side, thereby clamping the cutter head relative to the adapter or the tool handle.

[0003] This type of tool solves the problem that the adapter or tool holder of the same machine tool can cooperate with different tool heads and process holes of different diameters, but it also brings new problems. First, it is necessary to open an internal main coolant channel and a secondary coolant channel extending from the main coolant channel to the front end face in the adapter or tool holder at the same time, which can easily reduce its rigidity and firmness, and cannot reliably avoid fracture. Its hardening treatment is difficult and stress cracks are prone to occur. Second, the cutting edge will transfer the heat generated during the cutting process to the tool body by heat conduction. After the coolant of the device flows from the cooling channel into the sub-cooling channel, it directly supplies cooling and lubrication to the cutting edge from the outflow port, and the tool body with heat cannot be cooled well. For this reason, further improvements to the rotary tool are needed. Utility Model Content

[0004] The first technical problem to be solved by the utility model is to provide a rotary tool for convenient machining of cooling channels in view of the above-mentioned existing technical status.

[0005] The second technical problem to be solved by the present invention is to provide a rotary tool whose tool body can achieve better cooling 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 screw is screwed into the corresponding center position of the tool body at the front end side, thereby clamping the tool body relative to the adapter / tool ​​handle, and correspondingly, the tool body has a cavity for the screw to be screwed into;

[0009] It is characterized by: it also includes:

[0010] an annular cavity formed between the screw and the cavity for fluid communication with the adapter / shank;

[0011] A main cooling channel is provided in the center of the screw and is directly connected to the cooling channel on the adapter / tool ​​holder;

[0012] A secondary cooling channel is provided on the outer periphery of the screw, communicates with the primary cooling channel and extends to the annular cavity; and

[0013] A cooling channel is provided on the tool body and leads to the cutting area, and is also communicated with the annular cavity.

[0014] In order to achieve the connection of the coolant path, preferably, the screw includes a main body for setting the main cooling channel and the secondary cooling channel, 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 main cooling channel is opened inside the screw, the secondary cooling channel is opened radially outward from the main cooling channel, the outlet at the end of the secondary cooling channel is connected to the annular cavity, and the end of the annular cavity is blocked by the extension portion of the screw.

[0015] In order to facilitate the arrangement of the cooling channel, preferably, the cross section of the main body is in an inverted "T" shape, including a vertical section for setting the main cooling channel and a transverse section for setting the secondary cooling channel, and the extension is located at the front end of the transverse section. The main cooling channel extends axially from the vertical section of the screw to the transverse section, and the end of the main cooling channel is radially opened outward to form a plurality of secondary cooling channels.

[0016] In order to enclose and form an annular cavity space, preferably, 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 lateral wall of the transverse section and the second wall surface constitutes the spatial area of ​​the annular cavity. Wherein, the vertical section of the screw extends from the central hole to the outside of the cavity of the tool body, the upper circumference of the transverse section of the screw abuts against the second wall surface of the annular inner step, and the gap between the lateral wall of the transverse section and the second wall surface is an annular cavity space for the coolant of the secondary cooling channel to flow into.

[0017] In order to supply the coolant to the cutting edge, preferably, the second wall surface of the tool body is provided with an inlet of the sub-cooling channel, wherein the coolant first flows from the main cooling channel into the secondary cooling channel, the coolant in the secondary cooling channel enters the annular cavity space through the terminal outlet, and then the coolant enters the sub-cooling channel through the inlet on the second wall surface, and finally flows from the outlet on the cutting end surface to the corresponding cutting edge.

[0018] For the convenience of processing, preferably, each of the secondary cooling channels and the sub-cooling channels are radial relative to the main cooling channel as a whole. Wherein, the secondary cooling channels are designed to be radial, so that the coolant can enter the annular cavity from the main cooling channel in the shortest path.

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

[0020] 1. The cooling channel and the cutter body are processed independently. The cooling channel is processed on the screw. A cavity for installing the screw is provided in the cutter body. The cooling channel can be processed and then installed inside the cutter body, and the processing steps are convenient.

[0021] 2. The clamping screw is pressed into the main body of the cutter body, which not only realizes the fastening connection between the adapter and the cutter body, but also forms an integrated structure with the cooling channel. An annular flow channel for the circulation of coolant is formed between the inner wall of the cutter body and the outer wall of the clamping screw. The coolant in the annular flow channel can cool the cutter body better. 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 three-dimensional structural schematic diagram of another direction of the embodiment of the utility model;

[0024] Figure 3 This is a schematic diagram of the three-dimensional structure of the screw in the embodiment of the utility model;

[0025] Figure 4 It is a longitudinal cross-sectional view of the tool body in the embodiment of the utility model (screws omitted);

[0026] Figure 5 A longitudinal cross-sectional view of an embodiment of the utility model;

[0027] Figure 6 for Figure 5 A magnified schematic diagram of the local structure;

[0028] Figure 7 It is a transverse cross-sectional view of an embodiment of the utility model.

[0029] In the figure: 1. tool body; 11. cavity; 111. first wall; 112. second wall; 2. screw; 21. main body; 211. transverse section; 212. vertical section; 22. extension; 3. annular cavity; 4. main cooling channel; 5. secondary cooling channel; 6. sub-cooling channel; 7. central hole; 8. inlet. DETAILED DESCRIPTION

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0031] like Figures 1 to 7 The figure shows a preferred embodiment of the present invention. The rotary tool can be any type of rotary cutting tool, such as a boring bar, a drill bit, etc., and the adapter used in conjunction with the rotary cutting tool can also be any type of adapter, such as a non-tapered or cylindrical adapter.

[0032] The rotary tool of this embodiment includes a tool body 1 having a main body center axis B defining 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; it also includes a screw 2 screwed into a corresponding center position of the tool body 1 on the front end side, thereby clamping the tool body 1 relative to the adapter / tool ​​handle, and correspondingly, the tool body 1 has a cavity 11 for the screw 2 to be screwed into; the tool body 1 also includes an annular cavity 3 formed between the screw 2 and the cavity 11, and the annular cavity 3 is used to communicate with the adapter / tool ​​handle fluid; a main cooling channel 4 is provided in the center of the screw 2, and the main cooling channel 4 is directly connected to the cooling channel on the adapter / tool ​​handle; a secondary cooling channel 5 is provided on the periphery of the screw 2, and the secondary cooling channel 5 is connected to the main cooling channel 4 and extends to the annular cavity 3; a sub-cooling channel 6 connected to the annular cavity 3 is also provided on the tool body 1, and the sub-cooling channel 6 can guide the coolant to the cutting area.

[0033] The key point that the applicant needs to emphasize is that the coolant flow channel of the rotating tool is opened inside the screw 2, as shown in reference 3 and Figure 6The screw 2 includes a main body 21 for setting the main cooling channel 4 and the secondary cooling channel 5. The cross section of the main body 21 is an inverted "T" shape, including a vertical section 212 and a transverse section 211. The vertical section 212 has a narrow and long space and is used to set the main cooling channel 4. The transverse section 211 has a relatively large space and is used to set the radially distributed secondary cooling channel 5, 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 3. Among them, the main cooling channel 4 is opened inside the screw 2, and the secondary cooling channel 5 is opened radially outward from the main cooling channel 4. The outlet at the end of the secondary cooling channel 5 is connected to the annular cavity 3, and the end of the annular cavity 3 is blocked by the extension portion 22 of the screw 2, thereby forming a coolant flow path from the main cooling channel 4 to the end of the annular cavity 3. The flow direction of the coolant is referenced. Figure 5 and Figure 6 As shown by the arrow in the figure. The annular cavity 3 is formed by the tool body 1 and the screw 2. Figures 4 to 6 The cavity 11 on the tool body 1 is surrounded by an annular inner step, including a first wall surface 111 located above the step and a second wall surface 112 located below the step. A central hole 7 is provided in the center of the first wall surface 111 for the vertical section 212 to pass through, and the rear end of the transverse section 211 abuts against the first wall surface 111 to close the rear end of the annular cavity 3, and the gap between the side circumferential wall of the transverse section 211 and the second wall surface 112 constitutes the space area of ​​the annular cavity 3. Among them, the vertical section 212 of the screw 2 extends from the central hole 7 to the outside of the cavity 11 of the tool body 1, the upper circumferential surface of the transverse section 211 of the screw 2 abuts against the second wall surface 112 of the annular inner step, and the gap between the side circumferential wall of the transverse section 211 and the second wall surface 112 is the space of the annular cavity 3 for the coolant of the secondary cooling channel 5 to flow into.

[0034] In addition, the cutting edges of the present embodiment are distributed on the cutting head of the tool body 1. In order to guide the coolant to the cutting area for cooling, Figures 4 to 7 An inlet 8 of the sub-cooling channel 6 is provided on the second wall surface 112 of the tool body 1. The coolant first flows into the sub-cooling channel 5 from the main cooling channel 4. The coolant in the sub-cooling channel 5 enters the space of the annular cavity 3 through the terminal outlet. Then, the coolant enters the sub-cooling channel 6 through the inlet 8 on the second wall surface 112, and finally flows to the corresponding cutting edge from the outlet on the cutting end face. The sub-cooling channel 6 and the sub-cooling channel 5 are radial relative to the main cooling channel 4 as a whole. This design method allows the coolant to flow in the shortest path, thereby improving the cooling efficiency of the cutting edge.

[0035] In summary, the specific working process of the rotary tool is as follows: before processing, the rotary tool needs to select the corresponding adapter / tool ​​holder and install it in the cavity 11 of the tool body 1. After installation, the tool body 1 needs to be fixedly connected to the machine tool. During the processing, the high-speed rotating rotary tool and the workpiece will generate a lot of heat. At this time, it is necessary to introduce coolant from the end inlet of the adapter / tool ​​holder. The coolant flows from the cooling channel of the adapter into the main cooling channel 4 set in the vertical section 212 of the screw 2. The coolant is diverted at the end of the main cooling channel 4 and enters each secondary cooling channel 5. After passing through the secondary cooling channel 5, the coolant enters the annular cavity 3 at the outlet at its end. The coolant can cool the side wall of the tool body in the annular cavity 3. After completing the first round of cooling, the coolant enters each sub-cooling channel 6 from the inlet 8 opened on the second side wall, and finally flows out from the outlet at the end of the sub-cooling channel 6 to cool and lubricate the corresponding cutting edge.

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 screw (2) is screwed into the corresponding center position of the tool body (1) at the front end side, thereby clamping the tool body (1) relative to the adapter / tool ​​handle, and correspondingly, the tool body (1) has a cavity (11) for the screw (2) to be screwed into; Features: Also included are: an annular cavity (3) formed between the screw (2) and the cavity (11) for fluid communication with the adapter / handle; A main cooling channel (4) is provided in the center of the screw (2) and is directly connected to the cooling channel on the adapter / tool ​​handle; A secondary cooling channel (5) is provided on the outer periphery of the screw (2), is communicated with the primary cooling channel (4) and extends to the annular cavity (3); and A cooling channel (6) is provided on the tool body (1) and leads to the cutting area, and is also connected to the annular cavity (3).

2. The rotary tool according to claim 1, characterized in that: The screw (2) comprises a main body (21) for arranging the primary cooling channel (4) and the secondary cooling channel (5), 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 (3).

3. The rotary tool according to claim 2, characterized in that: The cross section of the main body (21) is in an inverted "T" shape, comprising a vertical section (212) for arranging the primary cooling channel (4) and a transverse section (211) for arranging the secondary cooling channel (5), and the extension portion (22) is located at the front end of the transverse section (211).

4. The rotary tool according to claim 3, characterized in that: The cavity (11) on the tool body (1) is surrounded by an annular inner step, and includes a first wall surface (111) located above the step and a second wall surface (112) located below the step. A central hole (7) is provided in the center of the first wall surface (111) for the vertical section (212) to pass through. The rear end of the transverse section (211) abuts against the first wall surface (111) to close the rear end of the annular cavity (3), and the gap between the side wall of the transverse section (211) and the second wall surface (112) constitutes the spatial area of ​​the annular cavity (3).

5. The rotary tool according to claim 4, characterized in that: An inlet (8) of the sub-cooling channel (6) is provided on the second wall surface (112) of the tool body (1).

6. The rotary tool according to any one of claims 1 to 5, characterized in that: Each of the secondary cooling channels (5) and the sub-cooling channels (6) is radially arranged relative to the main cooling channel (4).

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