In TC4 titanium plate cutting, the common process flow and contents are described as follows:
(1) If semi-automatic cutting is carried out, then the guide rail should be placed on the plane of the titanium plate, and then the cutting machine should be placed on top of the guide rail, and it should be noted that the order should not be reversed.
(2) The cutting parameters should be appropriate and should be reasonably determined according to the thickness of the titanium plate, etc., so that a good cutting effect can be obtained.
(3) Cutting nozzle gas should be checked to see if it is smooth, if there is a blockage should be promptly unblocked.
(4) Titanium plate before cutting, the surface should be cleaned up, and there should be a certain amount of space, which can be conducive to the slag blowing out.
(5) The distance between the cutting nozzle and the surface of the titanium plate should be appropriate, too close and too far is not good.
(6) The preheating of the titanium plate should be sufficient so as not to affect the cutting process.
(7) If cutting different sizes of workpieces, then the small pieces should be cut first, and then the large pieces.
Titanium Alloy Sheet
Titanium plate manufacturer's information shows that titanium is a new type of metal, titanium properties and the content of carbon, nitrogen, hydrogen, oxygen and other impurities contained in the titanium, Z pure titanium iodide impurity content of not more than 0.1%, but its strong
The performance of 99.5% industrial pure titanium is as follows: density ρ=4.5g/cm3, melting point is 1725℃, thermal conductivity λ=15.24W/(m.K), tensile strength
σb=539MPa, elongation δ=25%, section shrinkage ψ=25%, modulus of elasticity E=1.078×105MPa, hardness HB195.
(1)High specific strength
Titanium alloy density is generally around 4.5g/cm3, only 60% of steel, the strength of pure titanium is close to the strength of ordinary steel, some high-strength titanium alloys over many alloy structural steel
Strength. Therefore, the specific strength of titanium alloys (strength / density) is much greater than other metal structural materials, see Table 7-1, can be produced unit of high strength, good rigidity, lightweight parts and components. Currently flying
The engine components, skeleton, skin, fasteners and landing gear, etc. are using titanium alloys.
(2)High thermal strength
The use of temperature than the aluminum alloy several hundred degrees higher, in the medium temperature can still maintain the required strength, can be in the temperature of 450 ~ 500 ℃ long-term work of these two types of titanium alloys in the 150 ℃ ~ 500 ℃ range still has a very high ratio of titanium alloys to aluminum alloys, and can be used in the engine components.
The two types of titanium alloys in the range of 150 ℃ to 500 ℃ still have a very high specific strength, while the aluminum alloy in the 150 ℃ than the strength of a significant decline. The working temperature of titanium alloy can reach 500 ℃, aluminum alloy is below 200 ℃.
(3)Good corrosion resistance
Titanium alloy works in humid atmosphere and seawater medium, its corrosion resistance is far better than stainless steel; the resistance to pitting, acid corrosion, stress corrosion is particularly strong; alkali, chloride, chlorine of the
Organic items, nitric acid, sulfuric acid, etc. have excellent corrosion resistance. But titanium has a reducing oxygen and chromium salt media corrosion resistance is poor.
(4) Good low-temperature performance
Titanium alloy in low temperature and ultra-low temperature, can still maintain its mechanical properties. Good low-temperature performance, the gap element is very low titanium alloy, such as TA7, in -253 ℃ can also maintain a certain degree of plasticity. Therefore, titanium alloy is also a kind of
Therefore, titanium alloy is also an important low-temperature structural materials.
(5) Great chemical activity
Titanium's chemical activity, and the atmosphere O, N, H, CO, CO2, water vapor, ammonia and other strong chemical reactions. When the carbon content is greater than 0.2%, it will form in the titanium alloy
hard TiC; at higher temperatures, the role of N will also form a hard surface layer of TiN; above 600 ℃, titanium absorbs oxygen to form a hardened layer of high hardness; hydrogen content rises, but also the formation of a
Brittle layer. Absorption of gas and produce a hard brittle surface layer depth of up to 0.1 ~ 0.15mm, the degree of hardening for 20% ~ 30%. Titanium's chemical affinity is also large, easy and friction surface adhesion phenomenon.
Adhesion phenomenon.
(6) small thermal conductivity, small modulus of elasticity
Titanium's thermal conductivity λ = 15.24W / (m.K) is about 1/4 of nickel, iron 1/5, aluminum 1/14, and various titanium alloys than the thermal conductivity of titanium thermal conductivity decreased by about 50%. Titanium alloy
The modulus of elasticity of titanium alloy is about 1/2 of steel, so its rigidity is poor, easy to deform, not suitable for making slender rods and thin-walled parts, cutting the processing surface of the rebound amount is very large, about 2-3 times for stainless steel.
When cutting, the resilience of the machining surface is very large, about 2 to 3 times as much as stainless steel, resulting in intense friction, adhesion and bonding wear of the tool rear face.
