欧美人妻精品一区二区三区99,中文字幕日韩精品内射,精品国产综合成人亚洲区,久久香蕉国产线熟妇人妻

WC-Co carbide end mills are commonly used for titanium alloy milling. The material characteristics of the tools directly affect the tool life and milling efficiency. Extending the tool life of titanium alloy processing and improving the processing efficiency have always been hot topics in the industry.

In this study, two different high-temperature performance matrix body?materials were prepared by adding trace amounts of TaC (NbC) carbide to the carbide?matrix body. The high-temperature hardness and high-temperature fracture toughness of the two carbides were tested using a high-temperature Vickers hardness tester. Whole carbide?end mills?with the same geometric parameters were prepared based on the two matrix body?materials, and titanium alloy TC4 milling?tests were carried out. By analyzing the tool life and wear patterns, the impact of TaC (NbC) on the wear performance of carbide?milling?tools in high-speed milling was studied.

 

Experimental conditions and testing methods

Two different WC-Co-based carbide?materials with different compositions, named A and B, were prepared for the experiment. Trace amounts of TaC (NbC) carbide were added to material A, with a mass fraction of less than 0.1%. The compositions of the two carbides are shown in Table 1.

What are the 3 Points of Influence?will TaC (NbC) Have on the Wear of Carbide?End Mills? 2

The high-temperature hardness and high-temperature fracture toughness of materials A and B at different temperatures are shown in Figures 2 and 3, respectively.

What are the 3 Points of Influence?will TaC (NbC) Have on the Wear of Carbide?End Mills? 3

What are the 3 Points of Influence?will TaC (NbC) Have on the Wear of Carbide?End Mills? 4

Based on the two carbide?materials A and B, four-flute flat end mills?A and B with the same geometric parameters were prepared accordingly. The specifications and parameters of the tools are shown in Table 2.

What are the 3 Points of Influence?will TaC (NbC) Have on the Wear of Carbide?End Mills? 5

The workpiece material for the milling?test is annealed titanium alloy TC4, with a material hardness of 28.2 HRC. The milling?test was performed on a Mazak Nexus 430A-II vertical machining center, and the machining parameters are shown in Table 3.

What are the 3 Points of Influence?will TaC (NbC) Have on the Wear of Carbide?End Mills? 6

Experimental results and discussion

Under the same milling?conditions, the flank wear curves of end mills?A and B in the machining of titanium alloy TC4 are shown in Figure 4. Figure 5 shows the flank wear morphologies of the two end mills.

What are the 3 Points of Influence?will TaC (NbC) Have on the Wear of Carbide?End Mills? 7

end mills wear

What are the 3 Points of Influence?will TaC (NbC) Have on the Wear of Carbide?End Mills? 8
Fig.5 wear morphology figures of two tools

 

From Figures 4 and 5, it can be seen that when the milling?distance is less than 60m, both types of carbide?end mills?are in the normal wear stage, and the amount of wear on the tool’s back surface increases slowly. This stage is mainly in the early stage of milling, where the tool coating has good wear resistance and insulation, which effectively protects the tool matrix body?during this stage.

However, due to the very high milling?temperature of titanium alloy, as milling?continues, the coating on the tool edge is worn off, exposing the tool matrix body. The tool edge directly bears severe thermal and mechanical shock. As the matrix body?of end mills?A is added with trace alloy carbide TaC (NbC), its high-temperature hardness and high-temperature fracture toughness are higher than that of end mills?B. Therefore, end mills?A has more advantages than end mills?B in terms of the amount of wear on the back surface of the tool.

 

Analysis of end mills failure

After milling?200m using vertical milling cutters A and B, the worn positions of the tool tips were analyzed using a scanning electron microscope. The tip wear morphologies of the two vertical milling cutters are shown in Figure 6.

?Cuáles son los 3 puntos de influencia que TaC (NbC) tendrá en el desgaste de las fresas de metal duro? 9

From Figure 6, it can be seen that the addition of trace amounts of alloy carbide TaC(NbC) in vertical milling cutter A has improved the high-temperature fracture toughness of the WC-Co carbide, suppressed the formation and propagation of cracks within the tool matrix body, and extended the tool life. On the other hand, the high-temperature fracture toughness of vertical milling cutter B is lower than that of A, and when the milling?edge is subjected to severe thermal shock and mechanical loads, cracks are easily formed and continuously expanded, causing the tool matrix body?material at the milling?edge to break and ultimately resulting in tool failure.

Conclusión

Under the same main elements, the carbide?material A with trace amounts of alloy carbide TaC(NbC) has higher high-temperature hardness and fracture toughness than the carbide?material B without adding trace amounts of alloy carbide TaC(NbC). At 800℃, the high-temperature hardness is increased by approximately 14.5%, and the high-temperature fracture toughness is increased by approximately 10.2%.

When milling?titanium alloy TC4 under the same conditions, the tool with added trace amounts of alloy carbide TaC(NbC) has better wear resistance. When the milling?distance is 200m, the amount of wear on the back surface of vertical milling cutter A is 0.076mm, while the amount of wear on the back surface of vertical milling cutter B is 0.13mm.

The high-temperature fracture toughness of the carbide?material A with TaC(NbC) added is better. Under the same milling?conditions, the milling?edge retention of vertical milling cutter A is better, and there are significantly fewer cracks in the worn failure area compared to vertical milling cutter B.

Deja una respuesta

Tu dirección de correo electrónico no será publicada. Los campos obligatorios están marcados con *

亚洲av 又黄又爽十大| 日逼动态视频免费看| 护士毛片在线看中文字幕| 黑人大屌爆操骚货| 亚洲欧洲综合成人综合网| 最新国产亚洲亚洲精品A| 欧美国产综合日韩一区二区| 欧洲老妇人操大逼| 精品久久久久五月婷五月| 啊啊啊啊大鸡巴操我视频| av黄色资源在线观看| 综合欧美日韩一区二区三区| 国产熟女视频一区二区三区| 尤物AV无码国产在线看| 深插巴西美女的逼| 91精品国产剧情欧美一区二区| 天天免费的无码AV| 捆绑调教白浆一区二区三区| 性爱大鸡吧喷水视频| 亚洲欧洲日本精品| 在线观看日韩欧美| 99热这里有精品在线观看| 成人高清在线播放一区二区三区| 大鸡巴插我在线观看| 欧美人与兽大屌肛交爆菊| 日韩午夜免费av在线| 市长含着秘书的奶头| 国产情侣色综合久久有码| 好爽又高潮了毛片在线看| 男人天堂av在线免费看| 骚女性爱视频在线看| 91精品国产综合久久久蜜| 国产一区二区三区 韩国女主播| 国产成人AV一区二区在线观看| 男生的小鸡鸡插进女生的桃子 里| 偷窥国内肥臀老熟女视频| 亚洲国产综合精品 在线 一区| 泡芙啪啪啪黄色污污| 欧美精品第一区二区三区| 男人的天堂日本在线观看| 高清无码精品一区二区三区|