A pcd fine milling worm milling cutter

Abstract

The application relates to a PCD fine-milling worm milling cutter which comprises a cutter handle and a cutter head, four mounting grooves are arranged on the outer wall surface of the cutter head, a blade is arranged on each mounting groove, the side surface of the blade is tightly attached to the side wall of the mounting groove, a rake face is arranged on the blade, the rake face is the surface of the blade facing the cutting rotation direction, and the radial rake angles of the rake face of each blade on any cross section in the length range of the cutter head axis are equal. The application has the effect of prolonging the service life of the worm milling cutter.

Description

Technical Field

[0001] This application relates to the field of milling cutter technology, and in particular to a PCD finish milling worm end mill. Background Technology

[0002] A milling cutter is a rotating cutting tool with one or more cutting teeth used for milling operations. During operation, each cutting tooth cuts off the excess material of the workpiece in turn. A worm end mill is a special type of milling cutter, often used to machine workpieces with complex shapes and contours.

[0003] In the existing technology, when machining automotive air conditioning compressors, the side walls and bottom surfaces of stationary disc worm end mills, worm end mills are often used to cut materials. However, traditional worm end mills have a large height difference between the center of the front and rear cutting edges along the axial direction of the insert. This large height difference leads to inconsistent sharpness of the insert at the front and rear, causing the end mill to be subjected to different cutting forces during machining. This results in inconsistent wear or chipping of the insert along the axial direction, ultimately shortening the life of the insert and presenting significant shortcomings. Utility Model Content

[0004] To improve the service life of worm end mills, this application provides a PCD finish milling worm end mill.

[0005] The PCD finish milling worm end mill provided in this application adopts the following technical solution: A PCD precision milling worm end mill includes a shank and a cutter head. Four mounting slots are formed on the outer wall of the cutter head, and each mounting slot is provided with an insert. The face of the insert facing the cutting rotation direction is the rake face. The radial rake angle of the rake face of each insert is the same on any cross-section within the length range of the cutter head axis.

[0006] By adopting the above technical solution, during the production of the end mill, the insert is welded onto the mounting groove, and then a rake face is machined on the insert. The radial rake angle of the rake face is equal on any cross-section along the length of the cutter head axis. This setting makes the center height difference between the front and rear cutting edges of the insert the same, that is, the sharpness of the front and rear of the insert tends to be the same. This allows the insert to be subjected to the same cutting force during the machining process, reducing the possibility of inconsistent wear or chipping of the insert, and ultimately improving the service life of the worm end mill.

[0007] Optionally, the radial rake angle of each blade face is in the range of 3 to 5°.

[0008] By adopting the above technical solutions, a design with a radial rake angle of 3 to 5° can significantly improve cutting efficiency and tool life, while reducing force and heat during the cutting process, ensuring a smooth and efficient cutting process.

[0009] Optionally, the blades are not unequally distributed on the cutting head, that is, the radial rake angle on the rake face of each blade is different.

[0010] By adopting the above technical solution, the axial rake angle of each insert is different due to the unequal division of the four cutting edges. Therefore, during the milling process, the actual feed rate and the time interval between cutting into the workpiece of each insert are also different, which generates different milling force pulses. This can reduce or suppress resonance, reduce cutting noise and vibration, improve cutting efficiency and cutting quality, and make cutting more stable.

[0011] Optionally, the cutting head is provided with multiple chip removal surfaces, each chip removal surface is an inclined surface, the chip removal surface is located between two adjacent cutting blades, and a chip removal groove is formed on the chip removal surface, the chip removal groove extending along the length direction of the cutting handle.

[0012] By adopting the above technical solution, when the milling cutter is working, the chips cut by the insert will fall onto the chip surface along the rake face. The inclined chip surface can guide the chips into the chip removal groove and discharge them smoothly. The chip surface and chip removal groove effectively prevent the accumulation of chips in the cutter head, thereby reducing the impact of chips on the milling process.

[0013] Optionally, the rake face of the blade is helical.

[0014] By adopting the above technical solution, during the milling process, the helical rake face allows chips to be smoothly discharged along the helical groove, preventing chip accumulation in the cutting area, thereby improving machining efficiency and quality. Simultaneously, the helical rake face can reduce cutting forces, decrease tool wear, and extend tool life. Furthermore, this design helps improve the stability of the cutting process, reduces vibration and noise, and further enhances machining accuracy and surface quality.

[0015] Optionally, the blade tip is provided with a blade tip protection angle.

[0016] By adopting the above technical solution, a cutting edge protection angle is set at the tip of the cutting tool, which provides a certain degree of protection for the cutting tool. Without the cutting edge protection angle, the cutting tool is too long, and it is easy for the cutting tool to vibrate and break during the machining process. After adding the cutting edge protection angle, the cutting tool length is reduced and the sharpness of the cutting tool is increased. During the machining process, the probability of the cutting tool vibrating and breaking can be reduced, the anti-breakage performance of the cutting tool can be improved, which is conducive to improving the cutting performance and extending the service life of the cutting tool.

[0017] Optionally, the handle is made of cemented carbide and the blade is made of PCD material.

[0018] By adopting the above technical solutions, cemented carbide materials have the characteristics of high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance. PCD has the characteristics of high wear resistance, low friction and high hardness, and can be ground to produce a very sharp cutting edge and obtain a good machining surface, making it suitable for machining workpieces with complex shapes and contours.

[0019] In summary, this application includes at least one of the following beneficial technical effects: 1. This application welds the insert to the cutter head by means of axial shearing angle. This setting makes the center height difference between the front and rear cutting edges of the insert the same, that is, the sharpness of the front and rear of the insert tends to be the same. This makes the insert subjected to the same cutting force during the machining process, reducing the possibility of inconsistent wear or chipping of the insert, and ultimately improving the service life of the worm end mill. 2. By adopting a four-blade unequal division design, the actual feed rate and the time interval between cutting into the workpiece of each blade are different during the milling process, thereby generating different milling force pulses. This can reduce or suppress resonance, reduce cutting noise and vibration, and improve cutting efficiency and cutting quality, making the cutting smoother. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the tool holder and tool head of this application.

[0021] Figure 2 This is a schematic diagram of the blade structure in an embodiment of this application.

[0022] Figure 3 This is a side view of the handle and the blade in the embodiments of this application.

[0023] Figure 4 This is an embodiment of the present application. Figure 3 Cross-sectional view at position A in the middle.

[0024] Figure 5 This is an embodiment of the present application. Figure 3 Cross-sectional view at position B in the middle.

[0025] Figure 6 This is an embodiment of the present application. Figure 3 Cross-sectional view at position C in the middle.

[0026] Figure 7 This is a side view of the blade in an embodiment of this application.

[0027] Explanation of reference numerals in the attached diagram: 1. Tool holder; 2. Tool head; 3. Mounting slot; 4. Tool blade; 41. Rake face; 5. Chip removal face; 6. Chip removal groove; 7. Tool tip protection angle. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0029] This application discloses a PCD precision milling worm end mill.

[0030] Reference Figure 1 and Figure 2 A PCD precision milling worm end mill includes a tool holder 1 for fixing the end mill to a machining center and a cutter head 2 for cutting the workpiece. The cutter head 2 is mounted on the tool holder 1. Four mounting grooves 3 are formed on the outer surface of the cutter head 2. Inserts 4 are fixedly welded into each of the four mounting grooves 3. The surfaces of the inserts 4 near the mounting grooves 3 are tightly attached to the side walls of the mounting grooves 3. The tight fit between the mounting grooves 3 and the inserts 4 provides a large mounting area for the inserts 4, thereby improving the stability of the inserts 4 on the cutter head 2.

[0031] Reference Figure 1 and Figure 2 The tool holder 1 is made of cemented carbide material. In this embodiment, the tool holder 1 is made of tungsten steel material, which has the characteristics of high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance. The blade 4 is made of PCD material. PCD has the characteristics of high wear resistance, low friction and high hardness. It can be sharpened to produce a very sharp cutting edge and obtain a good machining surface. It is suitable for cutting cemented carbide and industrial ceramics and other high hardness products.

[0032] Reference Figure 1 and Figure 2 The tool holder 1 and the cutter head 2 are integrally formed. The diameter of the tool holder 1 is larger than the diameter of the cutter head 2. The connection between the tool holder 1 and the cutter head 2 is an arc surface. When the milling cutter is performing machining, the tool holder 1 is less likely to rub against the side wall or other parts of the machined workpiece, which reduces the interference of the tool holder 1 on the workpiece machining and improves the stability of the milling cutter during the machining process.

[0033] Reference Figure 1 and Figure 2 The cutting blade 4 has a rake face 41, which is the surface of the cutting blade 4 that rotates in the cutting direction. The radial rake angle of the rake face 41 of each cutting blade 4 is equal on any cross-section along the length of the cutting head 2 axis, and the radial rake angle ranges from 3 to 5°. The radial rake angles of the rake faces 41 of the four cutting blades 4 are not the same. The following is a detailed explanation using cross-sectional views at three different positions (A, B, and C) along the cutting head 2 axis: (Refer to...) Figures 3 to 6The radial rake angles of the four blades 4 rake faces 41 on the cross section at position A of the cutter head 2 are A1, A2, A3 and A4 respectively. The radial rake angles of the four blades 4 rake faces 41 on the cross section at position B of the cutter head 2 are B1, B2, B3 and B4 respectively. The radial rake angles of the four blades 4 rake faces 41 on the cross section at position C of the cutter head 2 are C1, C2, C3 and C4 respectively. Where A1 = B1 = C1, A2 = B2 = C2, A3 = B3 = C3, A4 = B4 = C4 and A1 ≠ A2 ≠ A3 ≠ A4.

[0034] By machining a rake face 41 on the insert 4 and ensuring that the radial rake angle of the rake face 41 is equal on any cross-section within the length range of the cutter head 2 axis, the center height difference between the front and rear cutting edges of the insert 4 is the same, that is, the front and rear sharpness of the insert 4 tends to be the same. This ensures that the insert 4 is subjected to the same cutting force during machining, reducing the possibility of inconsistent wear or chipping of the insert 4, and ultimately increasing the service life of the worm end mill. At the same time, the unequal division of the four cutting edges makes the actual feed rate and the time interval between cutting into the workpiece of each insert 4 different, thereby generating different milling force pulses, which can reduce or suppress resonance. While reducing cutting noise and vibration, it can also improve cutting efficiency and cutting quality, making the cutting smoother.

[0035] Reference Figure 7 The front cutting face 41 of the blade 4 is spiral-shaped. The cutter head 2 is provided with a chip removal surface 5 corresponding to the blade 4. The chip removal surface 5 is an inclined surface and is located between two adjacent blades 4. A chip removal groove 6 communicating with the front cutting face 41 is opened on the chip removal surface 5. The chip removal groove 6 extends along the length direction of the cutter head 2.

[0036] When the milling cutter is working, the ends of the rake face 41 and the flank face of the insert 4 abut against the workpiece. At this time, the chips cut by the insert 4 will fall onto the chip surface 5 along the rake face 41. The inclined chip surface 5 can guide the chips into the chip removal groove 6 and discharge them smoothly. The chip surface 5 and the chip removal groove 6 effectively avoid the accumulation of chips in the cutter head 2, thereby reducing the impact of chips on the milling process.

[0037] Reference Figure 7 The cutting edge of the insert 4 is provided with a cutting edge protection angle 7. Without the cutting edge protection angle 7, the cutting edge of the insert 4 is too long, which makes it prone to vibration and breakage during machining. However, with the cutting edge protection angle 7, the cutting edge length is reduced and the sharpness of the cutting edge is increased. This reduces the probability of vibration and breakage of the cutting edge and improves the cutting performance of the insert 4, thereby increasing the service life of the milling cutter.

[0038] The implementation principle of a PCD precision milling worm end mill according to an embodiment of this application is as follows: During the production of the end mill, the insert 4 is welded onto the mounting groove 3, and then a rake face 41 is machined on the insert 4. It is ensured that the radial rake angle of the rake face 41 is equal on any cross section within the length range of the cutter head 2 axis. Furthermore, the four inserts 4 are distributed on the cutter head 2 with a four-flute unequal distribution design. This arrangement makes the center height difference between the front and rear cutting edges of the insert 4 the same, that is, the front and rear sharpness of the insert 4 tends to be the same. This allows the insert 4 to be subjected to the same cutting force during the machining process, reducing the possibility of inconsistent wear or chipping of the insert 4. At the same time, it reduces or suppresses resonance, effectively improving the service life of the worm end mill.

[0039] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A PCD precision milling worm end mill, comprising a tool holder (1) and a cutter head (2), characterized in that, Four mounting slots (3) are provided on the outer wall of the cutter head (2). Each mounting slot (3) is provided with a blade (4). The side of the blade (4) is in close contact with the side wall of the mounting slot (3). A rake face (41) is provided on the blade (4). The rake face (41) is the surface of the blade (4) facing the cutting rotation direction. The radial rake angle of the rake face (41) of each blade (4) is equal on any cross section within the length range of the axis of the cutter head (2).

2. The PCD finish milling worm end mill according to claim 1, characterized in that, The radial rake angle of the rake face (41) of each of the blades (4) is in the range of 3~5°.

3. The PCD finish milling worm end mill according to claim 1, characterized in that, The blades (4) are not evenly distributed on the cutting head (2), that is, the radial rake angle of the rake face (41) of each blade (4) is different.

4. A PCD finish milling worm end mill according to claim 3, characterized in that, The cutter head (2) is provided with multiple chip removal surfaces (5), each chip removal surface (5) is an inclined surface, and the chip removal surface (5) is located between two adjacent blades (4). A chip removal groove (6) is provided on the chip removal surface (5), and the chip removal groove (6) extends along the length direction of the cutter head (2).

5. A PCD finish milling worm end mill according to claim 1, characterized in that, The front face (41) of the blade (4) is spiral-shaped.

6. A PCD finish milling worm end mill according to claim 1, characterized in that, The blade (4) has a blade tip protection angle (7) at the tip.

7. A PCD finish milling worm end mill according to claim 1, characterized in that, The handle (1) is made of cemented carbide, and the blade (4) is made of PCD material.

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