CVD diamond milling cutter

Abstract

The invention discloses a CVD diamond milling cutter which comprises a cutter bar and a cutter head arranged on the cutter bar, a circumferential edge is arranged in the circumferential direction of the cutter head, an end edge is arranged on the end face of the cutter head, the cutter head comprises a plurality of CVD diamond strips and alloy solder, the CVD diamond strips are arranged in the circumferential direction of the cutter bar at intervals, the CVD diamond strips are connected through the alloy solder, and the end edge is arranged on the end face of the cutter head. The circumferential blades are arranged on the CVD diamond strips, and the axial direction of the CVD diamond strips is perpendicular to the growth and deposition direction of the CVD diamond strips. The cutter disclosed by the invention has the advantages of good cutting stability, high efficiency, long service life and low cost.

Description

Technical Field

[0001] The invention relates to the technical field of metal cutting tools, in particular to a CVD diamond milling cutter. Background Art

[0002] Diamond tools are usually used for processing difficult-to-process materials such as ceramic-based composites. For example, the hardness of aviation workpieces made of ceramic-based composites is as high as 2500-3000Hv. When ordinary polycrystalline diamond tools are used, when the hardness of polycrystalline diamond reaches above 6000Hv, although it can meet the wear resistance requirements of the tool, its fracture strength is less than 800Mpa. When used, it has problems such as easy wear and chipping, which makes it difficult to meet the processing requirements of aerospace composites. Therefore, CVD diamond is needed. When the hardness of CVD diamond thick film reaches above 8500Hv, the fracture strength is greater than 1000Mpa, which can well meet the processing requirements of aerospace composites.

[0003] In the prior art, diamond cutter heads are usually integral. Since the axial and radial directions of the integral cutter heads are of a certain length, the growth and deposition direction of the CVD diamond thick film sheet is usually used as the axial direction of the superhard milling cutter head. The corresponding volume of thick film sheets are directly cut and cut, and the cutter head is made in conjunction with subsequent processing steps. This requires that the growth thickness of the diamond thick film sheet must be greater than the length of the milling cutter head, which is usually 5mm. However, diamond single crystal thick film sheets are prepared using the CVD process based on the crystal growth principle. Each 5mm thick film sheet takes 20-30 days to grow. In this manufacturing method, the cutting depth of the cutter head is highly dependent on the deposition thickness of the diamond thick film sheet, and the deposition speed of the diamond thick film sheet is slow, with low efficiency, high time cost and production cost.

[0004] In addition, during the processing, the hardness of CVD diamond will drop sharply when the temperature exceeds 600 degrees Celsius, affecting the cutting effect and the cutting life of the tool. The overall hardness of the one-piece CVD diamond head is high, and the difficulty of cooling hole processing increases. Summary of the invention

[0005] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a CVD diamond milling cutter with high manufacturing efficiency and low cost.

[0006] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0007] A CVD diamond milling cutter includes a tool shank and a tool tip provided on the tool shank. A peripheral edge is provided on the circumferential direction of the tool tip, and an end edge is provided on the end face of the tool tip. The tool tip includes a plurality of CVD diamond strips and alloy solder. The plurality of CVD diamond strips are arranged at intervals along the circumferential direction of the tool shank, and each of the CVD diamond strips is connected by alloy solder. The peripheral edge is provided on each CVD diamond strip, and the axial direction of the CVD diamond strip is perpendicular to its growth and deposition direction.

[0008] As a further improvement of the above technical solution:

[0009] A main internal cooling channel is provided in the tool shank, and a side internal cooling channel communicating with the main internal cooling channel is provided in the alloy solder.

[0010] There are multiple groups of the side internal cooling channels, and the multiple groups of side internal cooling channels are arranged at intervals along the circumferential direction of the tool shank.

[0011] One group of the side internal cooling channels includes multiple sub-internal cooling channels, and the multiple sub-internal cooling channels are arranged at intervals along the length direction of the peripheral edge.

[0012] Multiple peripheral edges on each CVD diamond strip are arranged in parallel.

[0013] Multiple coolant flow grooves are provided on each CVD diamond strip, and the multiple coolant flow grooves are arranged at intervals along the length direction of the peripheral edge.

[0014] The number of peripheral edges on each CVD diamond strip is M, and 2 ≤ M ≤ 8.

[0015] The end edge is provided at the end of each CVD diamond strip, and an end internal cooling channel corresponding to and communicating with the side internal cooling channel is provided at the end of the alloy solder.

[0016] Arc-shaped guiding parts are provided at the output ends of the side internal cooling channel and the end internal cooling channel, and the arc-shaped guiding parts face the corresponding peripheral edge and end edge.

[0017] The minimum distance from the hole wall of the side internal cooling channel to the edge of the alloy solder is X1, and 0.5 mm ≤ X1 ≤ 1 mm. The minimum distance from the hole wall of the end internal cooling channel to the edge of the alloy solder is X2, and 0.5 mm ≤ X2 ≤ 1 mm.

[0018] The total number of the side internal cooling channels and the end internal cooling channels is N, and the cross-sectional area S1 of the side internal cooling channel and the cross-sectional area S of the main internal cooling channel satisfy the following relationship: 0.4S ≤ N*S1 ≤ 0.5S.

[0019] The cutting head further includes a CVD diamond end cap, which is connected to the CVD diamond strip and the end of the alloy solder. The end cutting edge is provided on the CVD diamond end cap, and end internal cooling channels corresponding to and communicating with the side internal cooling channels one by one are provided on the CVD diamond end cap.

[0020] The number of the CVD diamond strips is N, and 2 ≤ N ≤ 5.

[0021] Compared with the prior art, the advantages of the present invention are as follows:

[0022] In the CVD diamond milling cutter disclosed by the present invention, the cutting head is no longer processed into a whole from a thick film, but a plurality of CVD diamond strips are arranged circumferentially along the tool shank. The CVD diamond strips are connected by alloy solder. Compared with an integral cutting head, the radial length of the split CVD diamond strip is shorter than the axial length. Also, according to the characteristic that the accumulation speed of the CVD diamond deposition thickness is slow, the axial direction of the CVD diamond strip is set to be perpendicular to its growth deposition direction, that is, the longer axial direction is set to be the length or width direction of the thick film, rather than the growth deposition thickness direction. At this time, the axial length of the CVD diamond strip no longer depends on the deposition thickness of the thick film, and the deposition time of the thick film can be reduced, thereby reducing the manufacturing time of the cutting head, improving the tool manufacturing efficiency, and also reducing the tool manufacturing cost due to the reduction of the use of CVD diamond.

[0023] Furthermore, in the CVD diamond milling cutter disclosed by the present invention, a main internal cooling channel is provided in the tool shank, and side internal cooling channels communicating with the main internal cooling channel are provided in the alloy solder. The coolant is input from the main internal cooling channel and output from the side of the alloy solder via the side internal cooling channels. During machining, when the tool shank rotates, the coolant can flow to the CVD diamond strips to cool the peripheral cutting edges, reduce the cutting temperature during the machining process, ensure the hardness of the CVD diamond strips and the cutting effect of the peripheral cutting edges, and improve the cutting life of the tool.

[0024] Furthermore, in the CVD diamond milling cutter disclosed by the present invention, multiple peripheral cutting edges on each CVD diamond strip are arranged in parallel, and multiple coolant flow grooves are provided on each CVD diamond strip. The multiple coolant flow grooves are arranged at intervals along the length direction of the peripheral cutting edge. The multiple peripheral cutting edges prevent the failure of the entire CVD diamond strip due to the breakage of one peripheral cutting edge when cutting a product with a relatively high hardness, improving the durability and cutting strength of the CVD diamond strip. Since there are multiple peripheral cutting edges arranged in parallel, the cooling effect of the peripheral cutting edge close to the side internal cooling channel is better than that of the peripheral cutting edge far from the side internal cooling channel. Therefore, multiple coolant flow grooves are provided to allow the coolant to flow better to the peripheral cutting edge far from the side internal cooling channel to ensure the cooling effect of each peripheral cutting edge. Description of the Drawings

[0025] Figure 1 is a three-dimensional structural schematic diagram of Embodiment 1 of the CVD diamond milling cutter of the present invention.

[0026] Figure 2 It is a front view structural schematic diagram of the first embodiment of the present invention.

[0027] Figure 3 is Figure 2 a sectional structural schematic diagram of A-A in

[0028] Figure 4 is Figure 2 a sectional structural schematic diagram of B-B in

[0029] Figure 5 It is a top view structural schematic diagram of the first embodiment of the present invention.

[0030] Figure 6 is Figure 5 a sectional structural schematic diagram of G-G in

[0031] Figure 7 It is a three-dimensional structural schematic diagram of the second embodiment of the CVD diamond milling cutter of the present invention.

[0032] Figure 8 It is a front view structural schematic diagram of the second embodiment of the present invention.

[0033] Figure 9 is Figure 8 a sectional structural schematic diagram of C-C in

[0034] Figure 10 is Figure 8 a sectional structural schematic diagram of D-D in

[0035] Figure 11 It is a top view structural schematic diagram of the first embodiment of the present invention.

[0036] Figure 12 is Figure 11 a sectional structural schematic diagram of F-F in

[0037] Each label in the figure represents: 1, tool shank; 2, tool tip; 3, peripheral edge; 4, end edge; 5, CVD diamond strip; 51, coolant flow groove; 6, alloy solder; 7, main internal cooling channel; 8, side internal cooling channel; 81, sub-internal cooling channel; 9, end internal cooling channel; 10, arc-shaped guiding part; 11, CVD diamond end cap. Specific embodiments

[0038] The present invention will be further described in detail below in conjunction with the accompanying drawings of the specification and specific embodiments.

[0039] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0040] In the present invention, unless otherwise clearly specified and defined, terms such as "assembly", "connected", "connected to", "fixed", etc. should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0041] Embodiment 1

[0042] Figures 1 to 6 An embodiment of the CVD diamond milling cutter of the present invention is shown. The CVD diamond milling cutter of this embodiment includes a tool shank 1 and a tool head 2 provided on the tool shank 1. A peripheral edge 3 is provided on the circumferential direction of the tool head 2, and an end edge 4 is provided on the end face of the tool head 2. The tool head 2 includes a plurality of CVD diamond strips 5 and alloy solder 6. The plurality of CVD diamond strips 5 are arranged at intervals along the circumferential direction of the tool shank 1. Each CVD diamond strip 5 is connected by alloy solder 6. The peripheral edge 3 is provided on each CVD diamond strip 5. The axial direction of the CVD diamond strip 5 is perpendicular to its growth and deposition direction.

[0043] For this CVD diamond milling cutter, the tool head 2 is no longer processed into a whole from a thick film, but a plurality of CVD diamond strips 5 are arranged along the circumferential direction of the tool shank 1. The CVD diamond strips 5 are connected by alloy solder 6. Compared with the integral tool head, the radial length of the split CVD diamond strips 5 is shorter than the axial length. Also, according to the characteristic that the accumulation speed of the CVD diamond deposition thickness is slow, the axial direction of the CVD diamond strip 5 is defined as perpendicular to its growth and deposition direction, that is, the longer axial direction is defined as the length or width direction of the thick film, rather than the deposition thickness direction of growth. At this time, the axial length of the CVD diamond strip 5 no longer depends on the deposition thickness of the thick film, but the deposition time of the thick film, thereby reducing the manufacturing time of the tool head 2 and improving the tool manufacturing efficiency. And because the amount of CVD diamond used is reduced, the tool manufacturing cost is also reduced.

[0044] Furthermore, in this embodiment, a main inner cooling channel 7 is provided in the tool bar 1, and a side inner cooling channel 8 connected to the main inner cooling channel 7 is provided in the alloy solder 6. The coolant is input from the main inner cooling channel 7 and output from the side of the alloy solder 6 via the side inner cooling channel 8. During processing, the tool bar 1 rotates, and the coolant can flow to the CVD diamond bar 5 to cool the peripheral blade 3, thereby reducing the cutting temperature during processing, ensuring the hardness of the CVD diamond bar 5 and the cutting effect of the peripheral blade 3, and improving the cutting life of the tool.

[0045] Furthermore, in this embodiment, a plurality of groups of side inner cooling channels 8 are provided, and the plurality of groups of side inner cooling channels 8 are arranged at intervals along the circumference of the tool bar 1, so as to further enhance the cooling effect.

[0046] Furthermore, in this embodiment, a group of side inner cooling channels 8 includes a plurality of sub-inner cooling channels 81, and the plurality of sub-inner cooling channels 81 are arranged at intervals along the length direction of the peripheral blade 3. This improves the cooling effect on all parts of the entire peripheral blade 3. Specifically, in this embodiment, three groups of side inner cooling channels 8 are provided, which are evenly arranged along the circumference of the tool bar 1, and each group of side inner cooling channels 8 includes three sub-inner cooling channels 81.

[0047] Furthermore, in this embodiment, multiple circumferential cutting edges 3 are arranged in parallel on each CVD diamond strip 5. This avoids the failure of the entire CVD diamond strip 5 due to the collapse of one circumferential cutting edge 3 when cutting a product with a higher hardness, thereby improving the durability and cutting strength of the CVD diamond strip 5. Preferably, the number of CVD diamond strips 5 is N, 2≤N≤5, and the number of circumferential cutting edges 3 on each CVD diamond strip 5 is M, 2≤M≤8.

[0048] Furthermore, in this embodiment, each CVD diamond bar 5 is provided with a plurality of coolant flow grooves 51, and the plurality of coolant flow grooves 51 are arranged at intervals along the length direction of the peripheral blade 3. Since a plurality of peripheral blades 3 are arranged in parallel, the cooling effect of the peripheral blade 3 close to the side inner cooling channel 8 is better than that of the peripheral blade 3 far from the side inner cooling channel 8, so a plurality of coolant flow grooves 51 are provided to allow the coolant to flow better to the peripheral blade 3 far from the side inner cooling channel 8, thereby ensuring the cooling effect of each peripheral blade 3. Preferably, the plurality of coolant flow grooves 51 are arranged in one-to-one correspondence with the outlets of the plurality of side inner cooling channels 8, so as to further enhance the flow effect of the coolant and the cooling effect on each peripheral blade 3.

[0049] Furthermore, in this embodiment, the end blade 4 is provided at the end of each CVD diamond bar 5, and the end of the alloy solder 6 is provided with an end inner cooling channel 9 connected to the side inner cooling channel 8. The coolant cools the end blade 4 through the side inner cooling channel 8 and the end inner cooling channel 9, thereby reducing the cutting temperature of the end blade 4 and ensuring the cutting effect. Specifically, the end inner cooling channel 9 should be connected to the sub-inner cooling channel 81 at the top.

[0050] Further, in this embodiment, arc-shaped guiding portions 10 are provided at the output ends of the side internal cooling channels 8 and the end internal cooling channels 9, and the arc-shaped guiding portions 10 face the corresponding peripheral cutting edges 3 and end cutting edges 4. Since the hardness of the alloy solder 6 is lower than that of the CVD diamond, the side internal cooling channels 8 and the end internal cooling channels 9 can be machined and manufactured by 3D printing. At the same time, it is also convenient to change the directions and shapes of the side internal cooling channels 8 and the end internal cooling channels 9. Therefore, the arc-shaped guiding portions 10 can be provided at the output ends to ensure that the coolant has sufficient output pressure and a reasonable flow path, and better flows to the corresponding peripheral cutting edges 3 and end cutting edges 4, further improving the cooling effect.

[0051] Further, in this embodiment, the minimum distance from the hole wall of the side internal cooling channel 8 to the edge of the alloy solder 6 is X1, 0.5 mm ≤ X1 ≤ 1 mm, and the minimum distance from the hole wall of the end internal cooling channel 9 to the edge of the alloy solder 6 is X2, 0.5 mm ≤ X2 ≤ 1 mm. This takes into account both the strength of the tool and the cooling and lubrication effects.

[0052] Further, in this embodiment, the total number of the side internal cooling channels 8 and the end internal cooling channels 9 is N, and the cross-sectional area S1 of the side internal cooling channel 8 and the cross-sectional area S of the main internal cooling channel 7 satisfy the following relationship: 0.4S ≤ N*S1 ≤ 0.5S. This ensures the flow pressure of the coolant.

[0053] Embodiment 2

[0054] Figures 7 to 12 An embodiment of the CVD diamond milling cutter of the present invention is shown. The CVD diamond milling cutter of this embodiment is substantially the same as that of Embodiment 1, except that: at the end of the cutter head 2 in Embodiment 1, the CVD diamond strips 5 and the alloy solder 6 are still arranged alternately, that is, both the CVD diamond strips 5 and the alloy solder 6 extend integrally to the end. In this embodiment, the cutter head 2 further includes a CVD diamond end cap 11. The CVD diamond end cap 11 is connected to the ends of the CVD diamond strips 5 and the alloy solder 6. The end cutting edge 4 is provided on the CVD diamond end cap 11, and end internal cooling channels 9 corresponding to the side internal cooling channels 8 are provided on the CVD diamond end cap 11.

[0055] For this CVD diamond milling cutter, the end of the cutter head 2 is connected to the CVD diamond end cap 11. The CVD diamond end cap 11 is ground from CVD diamond wafers. Since the CVD diamond end cap 11 has low requirements for the axial thickness, there is no need for CVD diamond thick films, which will not affect the overall manufacturing time. However, using a whole-piece CVD diamond end cap 11 at the end is beneficial for the setting of the end edge 3. In the first embodiment, the strength of the alloy solder 6 is too low to set the end edge 3. In this embodiment, the end edge 3 can be set arbitrarily in the CVD diamond end cap 11. However, due to the high hardness of CVD diamond, it is impossible to manufacture the internal coolant channel 9 at the end using ordinary 3D printing methods. Generally, methods such as laser are used for manufacturing, and the direction is difficult to change. Therefore, it is difficult to manufacture the arc-shaped guiding portion 10 for the internal coolant channel 9 at the end. However, the arc-shaped guiding portion 10 can still be set for the side internal coolant channel 8 in this embodiment.

[0056] Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make many possible changes and modifications to the technical solution of the present invention by using the above-disclosed technical content without departing from the scope of the technical solution of the present invention, or modify it into equivalent embodiments with equivalent changes. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection of the technical solution of the present invention.

Claims

1. A CVD diamond milling cutter, comprising a cutter bar (1) and a cutter head (2) provided on the cutter bar (1), a peripheral edge (3) is provided on the circumference of the cutter head (2), and an end edge (4) is provided on the end face of the cutter head (2), and it is characterized in that: The cutting head (2) includes a plurality of CVD diamond bars (5) and alloy solder (6). The plurality of CVD diamond bars (5) are arranged at intervals in the circumferential direction of the tool shank (1). Each of the CVD diamond bars (5) is connected by alloy solder (6). The peripheral cutting edge (3) is provided on each CVD diamond bar (5). The axial direction of the CVD diamond bar (5) is perpendicular to its growth and deposition direction.

2. The CVD diamond milling cutter according to claim 1, characterized in that: A main internal cooling channel (7) is provided in the tool shank (1), and a side internal cooling channel (8) communicating with the main internal cooling channel (7) is provided in the alloy solder (6).

3. The CVD diamond milling cutter according to claim 2, characterized in that: There are multiple groups of the side internal cooling channels (8), and the multiple groups of side internal cooling channels (8) are arranged at intervals in the circumferential direction of the tool shank (1).

4. The CVD diamond milling cutter according to claim 3, wherein: One group of the side internal cooling channels (8) includes a plurality of branch internal cooling channels (81), and the plurality of branch internal cooling channels (81) are arranged at intervals in the length direction of the peripheral cutting edge (3).

5. The CVD diamond milling cutter according to claim 1, characterized in that: Multiple peripheral cutting edges (3) are arranged in parallel on each CVD diamond bar (5).

6. The CVD diamond milling cutter according to claim 5, characterized in that: A plurality of coolant flow grooves (51) are provided on each CVD diamond bar (5), and the plurality of coolant flow grooves (51) are arranged at intervals in the length direction of the peripheral cutting edge (3).

7. The CVD diamond milling cutter according to claim 5, wherein: The number of peripheral cutting edges (3) on each CVD diamond bar (5) is M, and 2 ≤ M ≤ 8.

8. The CVD diamond milling cutter according to any one of claims 2 to 7, characterized in that: The end cutting edge (4) is provided at the end of each CVD diamond bar (5), and an end internal cooling channel (9) corresponding to and communicating with the side internal cooling channel (8) is provided at the end of the alloy solder (6).

9. The CVD diamond milling cutter according to claim 8, wherein: Arc-shaped guiding portions (10) are provided at the output ends of the side internal cooling channel (8) and the end internal cooling channel (9), and the arc-shaped guiding portions (10) face the corresponding peripheral cutting edge (3) and end cutting edge (4).

10. The CVD diamond milling cutter according to claim 8, wherein: The minimum distance from the pore wall of the side internal cooling channel (8) to the edge of the alloy solder (6) is X1, and 0.5 mm ≤ X1 ≤ 1 mm. The minimum distance from the pore wall of the end internal cooling channel (9) to the edge of the alloy solder (6) is X2, and 0.5 mm ≤ X2 ≤ 1 mm.

11. The CVD diamond milling cutter according to claim 8, wherein: The total number of the side internal cooling channels (8) and the end internal cooling channels (9) is N. The cross-sectional area S1 of the side internal cooling channel (8) and the cross-sectional area S of the main internal cooling channel (7) satisfy the following relationship: 0.4S ≤ N*S1 ≤ 0.5S.

12. The CVD diamond milling cutter according to any one of claims 2 to 7, characterized in that: The cutting head (2) further includes a CVD diamond end cap (11). The CVD diamond end cap (11) is connected to the ends of the CVD diamond bar (5) and the alloy solder (6). The end cutting edge (4) is provided on the CVD diamond end cap (11), and an end internal cooling channel (9) corresponding to and communicating with the side internal cooling channel (8) is provided on the CVD diamond end cap (11).

13. The CVD diamond milling cutter according to any one of claims 1 to 7, characterized in that: The number of the CVD diamond bars (5) is N, and 2 ≤ N ≤ 5.

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