{"id":2188,"date":"2026-06-24T13:19:36","date_gmt":"2026-06-24T13:19:36","guid":{"rendered":"https:\/\/cndlfh.com\/2188\/"},"modified":"2026-06-24T13:19:36","modified_gmt":"2026-06-24T13:19:36","slug":"%e9%92%9b%e5%90%88%e9%87%91%e5%88%87%e5%89%8a%e5%8a%a0%e5%b7%a5%e5%88%86%e6%9e%90","status":"publish","type":"post","link":"https:\/\/cndlfh.com\/en\/2188\/","title":{"rendered":"Analysis of the Machining of Titanium Alloys"},"content":{"rendered":"

titanium<\/a>machining<\/a>Analysis<\/p>\n

Abstract: This paper analyses the machining techniques for titanium alloys and sets out the appropriate measures that should be implemented to ensure machining quality.<\/p>\n

Keywords: titanium alloys; machining; measures<\/p>\n

1. Characteristics and Machining Requirements of Titanium Alloys<\/p>\n

Titanium alloys have a low modulus of elasticity; for example, the modulus of elasticity (E) of TC4 is approximately half that of steel. Consequently, the cutting forces cause significant elastic deformation of the workpiece, which can compromise its dimensional accuracy; it is therefore essential to improve the rigidity of the machining system. The workpiece must be clamped extremely securely to minimise the cutting moment at the point where the tool contacts the workpiece. The cutting tool must be sharp; otherwise, vibration and friction will occur, resulting in a reduced tool life and a decline in workpiece accuracy.<\/p>\n

2. Processingsurface roughness<\/a>Analysis of the reasons for the low figure<\/p>\n

When machining titanium alloys, chip build-up only occurs when the cutting speed is within the range of 1 to 5 millimetres per minute. Therefore, under normal production conditions, chip build-up does not occur when machining titanium alloys. The coefficient of friction between the workpiece and the cutting tool is not particularly high, making it relatively easy to achieve a good surface finish. The use of cooling lubricants has no effect on improving the microgeometry of the titanium alloy surface; the low surface roughness of machined titanium alloys is due to the absence of built-up edges on the cutting tool. However, in order to improve cutting conditions, reduce cutting temperatures, extend tool life and eliminate the risk of fire, the use of a generous supply of soluble coolant during machining is also essential.<\/p>\n

3. Measures to prevent sparks and combustion during machining<\/p>\n

Generally speaking, titanium alloy components do not give rise to sparks or combustion during machining; however, when machined under micro-cutting conditions, sparks and combustion may occur. To prevent such hazardous situations from arising, appropriate measures should be taken.<\/p>\n

3.1 Use large quantities of coolant;<\/p>\n

3.2 Remove swarf from the machine tool promptly;<\/p>\n

3.3 Fire-fighting equipment must be provided;<\/p>\n

3.4 Replace blunt knives promptly;<\/p>\n

\"\u949b\u5408\u91d1\u5207\u524a\u52a0\u5de5\u5de5\u827a\u5206\u6790_\u949b\u5408\u91d1\u52a0\u5de5\u4e0e\u9ad8\u6e29\u5408\u91d1\u52a0\u5de5\u5bf9\u6bd4_\u949b\u5408\u91d1\u52a0\u5de5\u8868\u9762\u7c97\u7cd9\u5ea6\u63a7\u5236\"<\/p>\n

3.5 Contamination on the workpiece surface can easily cause sparks; in such cases, the cutting speed must be reduced;<\/p>\n

3. Compared with thin chips, thick chips are less likely to produce sparks, so a larger feed rate is required. Increasing the feed rate does not cause the temperature to rise as rapidly as increasing the cutting speed does, is that correct?<\/p>\n

4. Guidelines for Selecting Cutting Parameters for Machining Titanium Alloys<\/p>\n

In an effort to reduce cutting temperatures, lower cutting speeds and larger feed rates are often employed; however, the high cutting temperatures cause titanium alloys to absorb oxygen and hydrogen from the atmosphere, resulting in the workpiece surface becoming hard and brittle, whilst simultaneously causing severe wear to the cutting tool. Consequently, during the machining process, it is necessary to maintain the tool tip temperature within an appropriate range and strictly prevent it from rising excessively.<\/p>\n

4. Currently, under intermittent cutting conditions, when using a YG8 turning tool to machine a titanium alloy workpiece with a hardened skin, the recommended cutting parameters are as follows: the cutting speed v should be within the range of 15 to 28 metres per minute, f ranges from 0.25 to 0.35 millimetres per revolution, and the depth of cut (ap) ranges from 1 to 3 millimetres.<\/p>\n

4. In continuous cutting operations, when performing finish turning on titanium alloy workpieces using a YG3 turning tool, the recommended cutting parameters are a cutting speed v within the range of 50 to 70 metres per minute, a feed rate f within the range of 0.1 to 0.2 millimetres per revolution, and the depth of cut (ap) should be within the range of 0.3 to 1 millimetres.<\/p>\n

4. The use of an emulsion for cooling can, to a certain extent, improve the tool\u2019s durability. Ensuring that the cutting edge possesses high wear resistance and hardness whilst maintaining its strength is key to the successful machining of titanium alloys. Therefore, after sharpening, the selected YG6X inserts should be back-ground using diamond or silicon carbide grinding stones to create a chamfer on the back face, thereby eliminating the burrs caused by sharpening and enhancing the strength of the cutting edge.<\/p>\n

4. When rough-turning workpieces with irregular black scale, the cutting edge should be ground to an angle of between three and five degrees; During finish turning, there is generally no rake angle; in this case, the predominant form of tool wear is adhesion to the rake face, also known as adhesive wear. This type of turning tool, with its distinctive characteristics, provides a reasonable solution to the problems associated with machining titanium alloys\u2014namely, the increase in material reactivity with rising temperature and poor thermal conductivity\u2014thereby significantly improving tool life.<\/p>\n

5. Drilling Processes for Titanium Alloys<\/p>\n

Drilling titanium alloys presents considerable challenges, with tool burning and drill breakage frequently occurring during the machining process. The main causes include poor drill sharpening, inadequate chip evacuation, ineffective cooling and insufficient rigidity of the machining system.<\/p>\n

5.1. A drill bit must be selected; one with a diameter greater than 5 mm is required, and it is best to use YG8 cemented carbide asTool materials<\/a>, When drilling holes smaller than 5 mm, high-speed steel drill bits with a hardness greater than 63 HRC, such as M42 or B201, may be used, where the hole depth is less than twice the diameter, a short-fluted drill should be used; where the hole depth exceeds twice the diameter, a twist drill should be used. 2. Drill bits have specific geometric parameters: \u03bb should be between 0 and 3\u00b0, \u03b1c between 13 and 15\u00b0, and 2\u03c6 between 120 and 130\u00b0.<\/p>\n

5. In order to facilitate chip formation and reduce friction, thereby improving the drill\u2019s cutting performance, the width of the guide edge can be reduced to between 0.1 and 0.3 mm, depending on the drill\u2019s diameter, the cross-edge should be ground to 0.1D, and the dual grinding angles should be set at 2\u03c6 = 130 to 140\u00b0 and 2\u03c6 = 70 to 80\u00b0, respectively.<\/p>\n

5. There are three carbide drill bits. Their cutting speed v ranges from 9 to 15 metres per minute, and their feed rate f ranges from 0.05 to 0.2 millimetres per revolution; High-speed steel drill bits have a cutting speed (v) ranging from 4 to 5 metres per minute, and a feed rate (f) per revolution ranging from 0.05 to 0.3 millimetres per revolution.<\/p>\n

5. When drilling deep holes or small-diameter holes, manual feed may be used. During drilling, the drill bit must be withdrawn from the hole at regular intervals to clear chips. To prevent excessive wear on the drill bit, it must not be left stationary in the hole\u2014neither advancing nor retracting\u2014as this would cause the cutting edges to rub against the machined surface, leading to work hardening and subsequent dulling of the drill bit. An adequate supply of cooling lubricant must be maintained throughout the drilling process. Soya oil is generally used; where necessary, OLTIP drilling and tapping oil from France may be added. The rigidity of the machining system should be maximised as far as possible; the drill jig should be secured to the worktable, positioned as close as possible to the machined surface, and the drill bit length minimised. The wear at the rear corner of the drill bit should be used as the criterion for determining when the drill bit has become blunt; this wear should be between 0.4 and 0.5 millimetres.<\/p>\n

5. In the five drilling examples, a molybdenum high-speed steel drill bit was used to drill a workpiece made of \u03b1 + \u03b2-type TC4 titanium alloy; the drill bit diameter was D = 6.35 mm and the hole depth was H = 12.7 mm. The cutting parameters selected were v = 11.6 m\/min and f = 0.127 mm\/r, with emulsion used for cooling. Tool life T was determined based on a wear width h\u2098 = 0.38 mm; each drill bit was capable of drilling 260 holes, with outstanding results.<\/p>\n

6. Selection of cutting tool materials for machining titanium alloys andProcessing<\/a>present (sb for a job etc)<\/p>\n

Titanium alloys are characterised by their low density; they possess high specific strength and thermal strength, excellent thermal stability and good corrosion resistance. They can significantly reduce product weight and improve the thrust-to-weight ratio, structural heat resistance and reliability; consequently, they are widely used in sectors such as aviation, aerospace, petroleum, chemical engineering and shipbuilding. Over the years, in light of product structural requirements, a number of investigations have been carried out into the machining processes for titanium alloys.<\/p>\n

6. Introduction to titanium alloys: Titanium alloys are allotropes; at temperatures below 882 \u00b0C, they exhibit a face-centred cubic crystal structure, known as \u03b1-titanium; at 882 \u00b0C, they adopt a body-centred hexagonal crystal structure, known as p-titanium. Depending on the type and quantity of alloying elements added, the phase transformations, temperatures and phase compositions gradually change, resulting in different titanium alloys. At room temperature, they can be classified into three types: \u03b1, (\u03b1+\u03b2) and \u03b2. The basic microstructures and their corresponding typical grades are as follows: \u03b1-titanium: TA6\u2013TA8; \u03b1+\u03b2: TC1\u2013TC11; \u03b2-titanium: TB1\u2013TB3.<\/p>\n

6. The factors influencing the machining behaviour of titanium alloys primarily encompass the durability of cutting tools, the quality of the machined surface, the difficulty of chip formation and the ease of chip removal, amongst other aspects. Taking all these factors into account, titanium and titanium alloys are classified as difficult-to-machine materials; their machinability is notably inferior to that of austenitic stainless steel. However, titanium alloys that have undergone annealing or solution treatment exhibit superior machinability compared to superalloys, whilst titanium alloys that have undergone treatments such as ageing exhibit machinability roughly equivalent to that of high-temperature alloys. They are characterised by low thermal conductivity and low thermal diffusivity, which in turn leads to relatively high temperatures being generated during the machining process. On average, the thermal conductivity of titanium alloys is half that of industrially pure titanium, whilst their thermal diffusivity is one-quarter that of iron and one-sixteenth that of aluminium. Consequently, under identical cutting conditions, the cutting temperature of titanium alloys is more than double that of 45 steel, The cutting deformation coefficient is low, and the cutting force per unit area is high; the cutting deformation coefficient of titanium alloys is less than 1 or close to 1. Once the titanium alloy chip is separated by the main cutting edge, it immediately curls upwards, resulting in reduced contact between the chip and the tool\u2019s rake face, the pressure borne per unit area of the tool is much greater than that for ordinary steels, causing the cutting temperature to rise sharply; they are also highly chemically reactive. At temperatures exceeding 300 \u00b0C, titanium alloys are extremely prone to \u201caffinity\u201d with the tool material, leading to severe tool sticking.<\/p>\n

6. Determining the selection of cutting tool materials: For cutting tools used in the machining of titanium alloys, the materials must possess high yield strength, high hardness, good toughness, good thermal stability and good wear resistance, as well as good heat dissipation properties. Under no circumstances should tool materials containing titanium be used, as such materials are highly prone to affinity with titanium alloys at high temperatures, which would accelerate tool wear. Cutting tools must have a smooth surface finish, and the cutting edge must be sharp. In the case of multi-edged tools, the runout of the cutting edge must be controlled.<\/p>\n

7. Measures taken during the machining of parts<\/p>\n

7. When machining titanium alloys, in accordance with the relevant requirements, the cutting machine must first be carefully selected; at the same time, the appropriate fixturing must also be chosen. The selected machine tool must possess good rigidity, sufficient power, and a wide range of speed and feed rates, as this is essential for the subsequent rational adjustment of cutting parameters. Before commencing machining, the clearance in the machine tool\u2019s guideways must be adjusted with the utmost care. If machining is to be carried out using feed in only one direction, it is advisable to lock the nut in the opposite direction to minimise machine vibration. Furthermore, the rigidity of the clamping fixture must also be adequate. When operating with a rotary table, the clearance must be properly adjusted and the nut secured.<\/p>\n

7. When machining titanium alloys, the selection of cutting parameters and tool geometry must take into account the fact that machining titanium alloys generates high temperatures, as high cutting temperatures accelerate tool wear. Typical cutting temperature ranges are as follows: for carbide tools, the cutting temperature should be maintained between 600 and 800 \u00b0C, whilst for high-speed steel tools, it should be kept within the range of 450 to 560 \u00b0C. Furthermore, cutting parameters must be strictly controlled, particularly ensuring that the cutting speed is not set too high.<\/p>\n

8. Conclusions<\/p>\n

During the machining of titanium alloys, it is necessary to adopt appropriate measures based on the specific circumstances in order to ensure that the quality of the machining is maintained.<\/p>\n

-The full text is complete. -The full text is complete.<\/p>","protected":false},"excerpt":{"rendered":"

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