Japan's Rijin Tools Co., Ltd. has developed CBN ball end mills and CBN arc end mills for processing high-grade molds. The performance characteristics and processing application examples are as follows.
1. CBN material properties CBN (polycrystalline cubic boron nitride) material has a hardness of about 3 times that of cemented carbide materials, and the tool made of it can realize long-life processing. CBN materials have high hardness and are easily broken. When manufacturing small-diameter end mills that can achieve continuous high-precision machining for a long time, scientific grinding technology and tool design to prevent chipping are required.
2. Tool Features SSBL200 long neck CBN ball end mill is developed to meet the precision machining requirements of high hardness deep cavity. It uses a cutting edge shape that prevents chip edge chipping and reduces cutting load, enabling high-precision machining and long tool life. The R accuracy of the tool is ±0.005mm, and the effective length of the R0.05 to R1mm specification range is 0.3 to 10mm, and there are 23 specifications.
(2) SSR200 CBN arc edge end mill SSR200 CBN arc edge end mill is used for efficient and high-precision milling of molds. In order to prevent the cutting edge from chipping, the cutting edge is subjected to a negative chamfer passivation strengthening treatment. At the time of processing, the company's self-developed control program is used to process from the bottom edge to the circumferential edge at the same time, so that the bottom edge and the circumferential edge can be smoothly connected without any connection, and the R precision is guaranteed to be ±0.005 mm. The tool's specification range is φ0.5～φ2.0mm, the cutting edge angle arc radius is R0.05～R0.5mm, and the effective length is 1.5～10mm. There are 26 kinds of specifications.
3. Processing application examples (1) SSBL200 CBN ball end mill processing example 1 stopwatch mold processing R0.5 × 5L SSBL200 CBN ball end mills are used to finish milling the stopwatch mold cavity. The mold material is STAVAX (HRC52), and the processing time is about 1 hour and 30 minutes. After processing one mold cavity, the R portion wear amount is about 1 μm, and the machined surface roughness is Rz1.30 μm. Finishing can still be continued depending on the wear condition and surface roughness.
2Three-dimensional cavity vertical wall mold processing R0.1×1L SSBL200 CBN ball end mill is used to finish milling three-dimensional cavity vertical wall mold, the mold material is STAVAX (HRC52), and the cutting length of one mold cavity is finished. It is about 14m, and it takes about 1 hour and 25 minutes. The tool wears well and the surface roughness Rz1.85μm can be used for further finishing.
(2) SSR200 CBN arc-edge end mill processing example The φ2×R0.5×6L SSR200 CBN arc-edge end mill is used to finish the mold cavity and the machining result of the SSB200 standard CBN ball end mill Comparison. The mold material is STAVAX (HRC52). In the machining plane, even if the theoretical surface roughness is set to the same level, a circular edge end mill can be used to select a larger feed rate than a ball end mill. This time, the precision milling of the arc-edge end mill takes 58 minutes, while the ball-end end mill takes 1 hour and 55 minutes, which is about 2 times. In addition, the quality of the machined surface is different from what can be seen by the naked eye. It can be seen that the selection of the applicable tool in combination with the processing application can improve the processing efficiency and reduce the processing cost.
1. CBN material properties CBN (polycrystalline cubic boron nitride) material has a hardness of about 3 times that of cemented carbide materials, and the tool made of it can realize long-life processing. CBN materials have high hardness and are easily broken. When manufacturing small-diameter end mills that can achieve continuous high-precision machining for a long time, scientific grinding technology and tool design to prevent chipping are required.
2. Tool Features SSBL200 long neck CBN ball end mill is developed to meet the precision machining requirements of high hardness deep cavity. It uses a cutting edge shape that prevents chip edge chipping and reduces cutting load, enabling high-precision machining and long tool life. The R accuracy of the tool is ±0.005mm, and the effective length of the R0.05 to R1mm specification range is 0.3 to 10mm, and there are 23 specifications.
(2) SSR200 CBN arc edge end mill SSR200 CBN arc edge end mill is used for efficient and high-precision milling of molds. In order to prevent the cutting edge from chipping, the cutting edge is subjected to a negative chamfer passivation strengthening treatment. At the time of processing, the company's self-developed control program is used to process from the bottom edge to the circumferential edge at the same time, so that the bottom edge and the circumferential edge can be smoothly connected without any connection, and the R precision is guaranteed to be ±0.005 mm. The tool's specification range is φ0.5～φ2.0mm, the cutting edge angle arc radius is R0.05～R0.5mm, and the effective length is 1.5～10mm. There are 26 kinds of specifications.
3. Processing application examples (1) SSBL200 CBN ball end mill processing example 1 stopwatch mold processing R0.5 × 5L SSBL200 CBN ball end mills are used to finish milling the stopwatch mold cavity. The mold material is STAVAX (HRC52), and the processing time is about 1 hour and 30 minutes. After processing one mold cavity, the R portion wear amount is about 1 μm, and the machined surface roughness is Rz1.30 μm. Finishing can still be continued depending on the wear condition and surface roughness.
2Three-dimensional cavity vertical wall mold processing R0.1×1L SSBL200 CBN ball end mill is used to finish milling three-dimensional cavity vertical wall mold, the mold material is STAVAX (HRC52), and the cutting length of one mold cavity is finished. It is about 14m, and it takes about 1 hour and 25 minutes. The tool wears well and the surface roughness Rz1.85μm can be used for further finishing.
(2) SSR200 CBN arc-edge end mill processing example The φ2×R0.5×6L SSR200 CBN arc-edge end mill is used to finish the mold cavity and the machining result of the SSB200 standard CBN ball end mill Comparison. The mold material is STAVAX (HRC52). In the machining plane, even if the theoretical surface roughness is set to the same level, a circular edge end mill can be used to select a larger feed rate than a ball end mill. This time, the precision milling of the arc-edge end mill takes 58 minutes, while the ball-end end mill takes 1 hour and 55 minutes, which is about 2 times. In addition, the quality of the machined surface is different from what can be seen by the naked eye. It can be seen that the selection of the applicable tool in combination with the processing application can improve the processing efficiency and reduce the processing cost.
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