Metal ceramic milling cutter with high wear resistance

Abstract

The utility model relates to the technical field of milling cutters, and provides a metal ceramic milling cutter with high wear resistance, which comprises a milling cutter, a base, a fastening sleeve and three clamping blocks, the milling cutter comprises a cutter head and an engineering plastic handle, the outer wall of the cutter head is provided with a chip groove, the front end part of the cutter head is provided with a blade, the rear end part of the cutter head is fixedly connected with a plurality of extension columns, and the extension columns are fixedly connected with the base. The extension column is inserted into the engineering plastic handle; the tool bit is made of metal ceramic, the front angle of the end edge of the cutting edge ranges from 5 degrees to 0 degree, and the rear angle of the cutting edge ranges from 5 degrees to 8 degrees. By means of the end edge front angle which is small or even zero, when the milling cutter works, the small front angle can increase the strength of the cutting edge and improve the impact resistance of the cutter, so that the service life of the cutter is prolonged, heat generated in the cutting process is reduced, meanwhile, cutting deformation and friction resistance are reduced, and the service life of the cutter is prolonged. The machining precision of the milling cutter is improved.

Description

Technical Field

[0001] This utility model belongs to the field of milling cutter technology, specifically relating to a high wear-resistant metal-ceramic milling cutter. Background Technology

[0002] High-wear-resistant cermet end mills are high-performance cutting tools specifically designed for machining high-hardness materials. They combine the toughness of metals with the high hardness of ceramics, and are manufactured using powder metallurgy. These end mills possess characteristics such as high hardness, good toughness, high temperature resistance, good thermal conductivity, and chemical stability, and are widely used in high-speed cutting of hard materials, manufacturing of wear-resistant parts, and machining of high-temperature structural components. When using them, attention must be paid to the tool's geometry and cutting parameters to fully utilize their performance advantages.

[0003] A known authorized patent with application number 202121607771.9 discloses a cermet end mill for machining liquid metal, comprising a cutting part and a shank made of cermet material. The cutting part has a plurality of peripheral chip removal grooves spirally extending from the front end to the shank. The spiral angle of the peripheral chip removal grooves is 30° to 35°. The surface of the peripheral chip removal groove facing the cutting rotation direction is the rake face, and the surface of the peripheral chip removal groove facing away from the cutting rotation direction is the flank face. The rake face and the flank face intersect to form a peripheral edge. An eccentric arc surface is provided on the flank face near the tip of the peripheral edge. The eccentric arc surface extends spirally along the peripheral chip removal grooves and has a width of 0.02 mm to 0.05 mm. This invention provides higher wear resistance and more effective cutting performance, ensuring that the tool can smoothly process liquid metal while significantly reducing the tool's processing cost. Furthermore, it enhances the support and stability of the cutting edge, resulting in stable processing accuracy and good surface quality.

[0004] However, during the implementation of the relevant technologies, the following problems were found with the above technical solutions: When in use, the rake angle of the cutting edge is too large, which reduces the cutting performance when cutting harder metals and increases thermal deformation, affecting the cutting accuracy.

[0005] Therefore, high wear-resistant cermet end mills are proposed to solve the above problems. Utility Model Content

[0006] This invention proposes a high wear-resistant metal-ceramic end mill, which solves the problem in related technologies where an excessively large end-edge rake angle reduces cutting performance and increases thermal deformation when cutting harder metals, thus affecting cutting accuracy.

[0007] The technical solution of this utility model is as follows: a high wear-resistant metal ceramic end mill, comprising: an end mill, a base, a fastening sleeve and three clamping blocks, the end mill comprising a cutter head and an engineering plastic shank, the outer wall of the cutter head is provided with a chip removal groove, the front end of the cutter head is provided with a cutting edge, and the rear end of the cutter head is fixedly connected with a plurality of extension posts, the extension posts being inserted into the engineering plastic shank;

[0008] The blade head is made of metal ceramic, the tip angle of the blade is 5°-0°, and the back angle of the blade is 5°-8°.

[0009] The milling cutter is clamped and fixed to the base by three clamping blocks, and the fastening sleeve is sleeved on the outside of the clamping blocks and the base and connected to the base.

[0010] Preferably, there are two extension posts, arranged circumferentially at the rear end of the cutter head, and the extension posts are tightly connected to the engineering plastic handle.

[0011] Preferably, the three clamping blocks are arranged circumferentially, and the milling cutter is clamped in the center of the three clamping blocks; the upper surface of the base is fixedly connected to three sets of slide rails, which are arranged radially, and the bottom of each of the three clamping blocks is provided with a slide groove, which is slidably connected to the slide rail, allowing the clamping block to slide along the slide rail toward or away from the center.

[0012] Preferably, the inner walls of the three clamping blocks are fixedly connected with contact blocks.

[0013] Preferably, the engineering plastic shank of the milling cutter is clamped at the center of three clamping blocks and in contact with the contact block, and the outer wall of the engineering plastic shank is frosted.

[0014] Preferably, the fastening sleeve is a hollow sleeve-shaped component, and the inner top surface of the fastening sleeve forms a tapered fit with the outer wall of the three clamping blocks; the inner wall of the fastening sleeve is provided with internal threads, which are threadedly connected to the outer wall of the base.

[0015] Preferably, the length of the engineering plastic shank accounts for 40%-50% of the overall length of the milling cutter, the length of the extension post is 10%-15% of the total length of the milling cutter, and the length of the cutter head accounts for 10%-33% of the overall length of the milling cutter.

[0016] Preferably, the helix angle of the chip removal groove is 25°-32°, and the depth of the chip removal groove accounts for 5%-15% of the total length of the end mill.

[0017] The working principle and beneficial effects of this utility model are as follows:

[0018] 1. By using a small or even zero-degree rake angle, the end mill can increase the strength of the cutting edge and improve the tool's resistance to impact during operation, thereby extending the tool's service life. In addition, a smaller rake angle helps to reduce heat generation during the cutting process, while reducing cutting deformation and frictional resistance, thereby increasing the machining accuracy of the end mill.

[0019] 2. By using an engineering plastic handle, the handle will break before any sudden impact occurs when the device is in operation after being fixed in place. This is because the strength of engineering plastic is lower than that of metal and ceramic, ensuring the safe operation of the remaining parts of the milling equipment. Attached Figure Description

[0020] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a schematic diagram of the front view structure proposed in this utility model;

[0023] Figure 3 This is a partial cross-sectional view of the structure proposed in this utility model;

[0024] Figure 4 A three-dimensional structural diagram of the milling cutter proposed in this utility model is provided;

[0025] Figure 5 This is a frontal half-sectional view of the milling cutter proposed in this utility model.

[0026] In the diagram: 1. Milling cutter; 101. Cutting edge; 102. Chip removal groove; 103. Cutting head; 104. Extension post; 105. Engineering plastic handle; 2. Base; 3. Fastening sleeve; 4. Clamping block; 5. Contact block; 6. Slide rail; 7. Slide groove. Detailed Implementation

[0027] The technical solutions of this utility model will be clearly and completely described below with reference to the embodiments of this utility model. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this utility model.

[0028] Implementation

[0029] Please see Figure 1-5. High wear-resistant metal-ceramic end mill, including: end mill 1, base 2, fastening sleeve 3 and three clamping blocks 4. The end mill 1 includes a cutter head 103 and an engineering plastic shank 105. The outer wall of the cutter head 103 is provided with a chip removal groove 102. The front end of the cutter head 103 is provided with a cutting edge 101. The rear end of the cutter head 103 is fixedly connected with a plurality of extension posts 104. The extension posts 104 are inserted into the engineering plastic shank 105.

[0030] The blade 103 is made of metal ceramic, the tip angle of the blade 101 is 5°-0°, and the back angle of the blade 101 is 5°-8°.

[0031] The milling cutter 1 is clamped and fixed on the base 2 by three clamping blocks 4, and the fastening sleeve 3 is sleeved on the clamping blocks 4 and the base 2 and connected to the base 2.

[0032] The technical solution provided in this embodiment is as follows: When in use, the base 2 is first fixed in the working position of the milling machine, and then the engineering plastic handle 105 of the milling cutter 1 is placed in the center of the three clamping blocks 4. After that, the fastening sleeve 3 is sleeved on the three clamping blocks 4 and the base 2 and rotated into place. During the tightening of the fastening sleeve 3, due to the tapered fit, the inner top surface of the fastening sleeve 3 presses the three clamping blocks 4 toward the center, converting the axial movement of the fastening sleeve 3 into the radial movement of the clamping blocks 4, pushing the clamping blocks 4 to slide along the slide rail 6 toward the center, and then clamping the milling cutter 1 through the contact block 5, with high clamping accuracy. During machining, the cutting edge 101 first contacts the workpiece being milled, and the smaller end-edge rake angle increases the working performance of the cutting edge 101. The metal chips during milling are discharged through the chip removal groove 102, preventing metal chips from remaining on the surface of the workpiece, which would reduce milling accuracy or cause scratches on the surface of the workpiece. In the event of a sudden collision during operation, because the strength and rigidity of engineering plastics are lower than those of metal ceramics, the engineering plastic shank 105 will break first, preventing damage to other parts of the milling machine. Engineering plastics also have superior performance, and the bottom of the cutter head 103 is provided with an extension post 104, allowing the engineering plastic shank 105 to cut normally.

[0033] Furthermore, there are two extension posts 104, which are arranged circumferentially at the rear end of the cutter head 103, and the extension posts 104 are tightly connected to the engineering plastic handle 105.

[0034] Specifically, the extension post 104 ensures a more secure connection between the cutter head 103 and the engineering plastic handle 105, preventing them from easily falling off.

[0035] Furthermore, the three clamping blocks 4 are arranged circumferentially, and the milling cutter 1 is clamped in the center of the three clamping blocks 4; the upper surface of the base 2 is fixedly connected with three sets of slide rails 6, which are arranged radially, and the bottom of each of the three clamping blocks 4 is provided with a slide groove 7, which is slidably connected to the slide rail 6, allowing the clamping block 4 to slide along the slide rail 6 toward or away from the center.

[0036] Specifically, the cooperation between the slide groove 7 and the slide rail 6 makes the clamping block 4 more accurate during operation. After clamping, the center formed by the clamping block 4 is closer to the center of the milling cutter 1.

[0037] Furthermore, contact blocks 5 are fixedly connected to the inner walls of the three clamping blocks 4.

[0038] Specifically, the contact block 5 increases the friction of the clamping block 4 when the end mill 1 is clamped, thus improving the performance of the end mill 1 during cutting.

[0039] Furthermore, the engineering plastic shank 105 of the milling cutter 1 is clamped in the center of three clamping blocks 4 and in contact with the contact block 5. The outer wall of the engineering plastic shank 105 is sanded.

[0040] Specifically, the frosted outer wall of the engineering plastic handle 105 makes the installation of the milling cutter 1 more reliable, and after installation, it can effectively generate greater friction between the milling cutter and the contact block 5.

[0041] Furthermore, the fastening sleeve 3 is a hollow sleeve-shaped component, and the inner top surface of the fastening sleeve 3 forms a tapered fit with the outer wall of the three clamping blocks 4; the inner wall of the fastening sleeve 3 is provided with internal threads, which are threadedly connected to the outer wall of the base 2.

[0042] Specifically, the tapered fit design allows the clamping block 4 to be effectively pushed towards the center when the fastening sleeve 3 rotates.

[0043] Furthermore, the length of the engineering plastic shank 105 accounts for 40%-50% of the overall length of the milling cutter 1, the length of the extension post 104 is 10%-15% of the total length of the milling cutter 1, and the length of the cutter head 103 accounts for 10%-33% of the overall length of the milling cutter 1.

[0044] Specifically, the length of the extension post 104 ensures that the engineering plastic handle 105 can break in time, thus ensuring a more reliable connection between the cutter head 103 and the engineering plastic handle 105. The smaller proportion of the cutter head 103 makes the overall strength of the cutter head 103 higher when cutting, thus preventing the cutter head 103 from breaking accidentally when cutting harder metals.

[0045] Furthermore, the helix angle of the chip removal groove 102 is 25°-32°, and the depth of the chip removal groove 102 accounts for 5%-15% of the total length of the end mill 1.

[0046] Specifically, a helix angle of 25°-32° can ensure high cutting stability while avoiding excessive reduction in chip removal efficiency, thus preventing poor chip removal. A chip removal groove depth of 5%-15% ensures smooth chip removal for the milling cutter 1 while maintaining its strength.

[0047] The above are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. High wear-resistant cermet end mills, including: The milling cutter (1), base (2), fastening sleeve (3) and three clamping blocks (4) are characterized in that the milling cutter (1) includes a cutter head (103) and an engineering plastic shank (105), the outer wall of the cutter head (103) is provided with a chip removal groove (102), the front end of the cutter head (103) is provided with a cutting edge (101), and the rear end of the cutter head (103) is fixedly connected with a plurality of extension posts (104), the extension posts (104) being inserted into the engineering plastic shank (105); The blade (103) is made of metal ceramic, the tip angle of the blade (101) is 5°-0°, and the back angle of the blade (101) is 5°-8°. The milling cutter (1) is clamped and fixed on the base (2) by three clamping blocks (4), and the fastening sleeve (3) is sleeved on the clamping blocks (4) and the base (2) and connected to the base (2).

2. The high wear-resistant cermet end mill according to claim 1, characterized in that: There are two extension posts (104), which are arranged circumferentially at the rear end of the cutter head (103), and the extension posts (104) are tightly connected to the engineering plastic handle (105).

3. The high wear-resistant cermet end mill according to claim 2, characterized in that: The three clamping blocks (4) are arranged circumferentially, and the milling cutter (1) is clamped in the center of the three clamping blocks (4); the upper surface of the base (2) is fixedly connected with three sets of slide rails (6), the three sets of slide rails (6) are arranged radially, and the bottom of each of the three clamping blocks (4) is provided with a slide groove (7), the slide groove (7) is slidably connected to the slide rail (6) respectively, allowing the clamping block (4) to slide along the slide rail (6) toward or away from the center.

4. The high wear-resistant cermet end mill according to claim 3, characterized in that: Contact blocks (5) are fixedly connected to the inner walls of the three clamping blocks (4).

5. The high wear-resistant cermet end mill according to claim 4, characterized in that: The engineering plastic handle (105) of the milling cutter (1) is clamped in the center of three clamping blocks (4) and in contact with the contact block (5). The outer wall of the engineering plastic handle (105) is sanded.

6. The high wear-resistant cermet end mill according to claim 3, characterized in that: The fastening sleeve (3) is a hollow sleeve-shaped component. The inner top surface of the fastening sleeve (3) forms a tapered fit with the outer wall of the three clamping blocks (4). The inner wall of the fastening sleeve (3) is provided with an internal thread, which is threadedly connected to the outer wall of the base (2).

7. The high wear-resistant cermet end mill according to claim 2, characterized in that: The length of the engineering plastic handle (105) accounts for 40%-50% of the overall length of the milling cutter (1), the length of the extension post (104) is 10%-15% of the total length of the milling cutter (1), and the length of the cutter head (103) accounts for 10%-33% of the overall length of the milling cutter (1).

8. The high wear-resistant cermet end mill according to claim 1, characterized in that: The helix angle of the chip removal groove (102) is 25°-32°, and the depth of the chip removal groove (102) accounts for 5%-15% of the total length of the end mill (1).

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