Aluminum turning
Turning
Turning of aluminum alloys falls into two categories:
Class 1 refers to industrial pure aluminum and annealed aluminum alloys with a hardness less than 80 HB;
Class 2 refers to the deformed aluminum alloy in the quenched state. The aluminum alloy turning process parameters are related to this category.
(1). Due to the relatively low strength and hardness of aluminum alloys, low plasticity, low tool wear, and high thermal conductivity, resulting in low turning temperatures, aluminum alloys have better turning performance and are easy to process materials and suitable for high speeds. Turning. But the melting point of the aluminum alloy is low, and the plasticity increases after the temperature rises. Under the action of high temperature and high pressure, the frictional force of the turning interface is very large. Easy to stick knife; especially in the annealed aluminum alloy, can not obtain a high-precision surface.
(2). Compared with steel and brass, the characteristics of aluminum alloys are 1, soft material, poor rigidity, and low elastic modulus. These two factors affect the turning processability of aluminum alloys. Therefore, when machining an aluminum alloy workpiece, it is necessary to sufficiently clamp and support the workpiece and keep the tool sharp; otherwise, the workpiece tends to leave the turning tool. Sometimes the surface of the workpiece has irregular groove marks and bright squeezing spots. One may be caused by the abnormal pressure of the tool on the workpiece, and the other may be due to chattering caused by unstable clamping. The surface of the workpiece is subjected to interstitial grinding, extrusion and powder turning; Then, when the gap or elasticity disappears, the tool bites the surface of the workpiece and marks the groove.
(3). In order to obtain a smooth workpiece surface, use a combination of rough turning and fine turning as much as possible, because a variety of qualified workpiece blanks always have some oxide layers, resulting in a considerable degree of tool wear. The above requirements can be achieved by using a sharp, polished tool for the fine turning of the final turning operation.
Technology
1. Bending
1.2.1 Using Equipment: Bending Machine
1.2.2 Technical Requirements:
1> When no size tolerance is specified, the dimensional accuracy of the workpiece after bending is controlled within 0.2mm, and the angle error is controlled within 1 degree.
2> the bend without cracks or wrinkles
3> After confirming the sample, it can be mass produced
2. Welding process
Aluminum and aluminum alloy welding methods are many, each with its own characteristics and applicable occasions. For the current structural features of Kangding's aluminum products, two welding methods, TIG welding and resistance welding, are recommended. For the aluminum and aluminum alloy welding characteristics, TIG welding and resistance welding application points and technical requirements are as follows.
2.1 TIG welding
2.1.1 Joint form and groove preparation: TIG welding Aluminium and aluminum alloy joints are: butt joints, lap joints, corner joints and T-joints. The joint geometry is similar to that of welded steel. However, due to the better fluidity of aluminum and aluminum alloys and the larger size of the torch nozzles, smaller root gaps and larger groove angles are generally used.
2.1.2 Welding current types
The use of alternating current welding of aluminum and aluminum alloys achieves good purification while at the same time achieving a satisfactory penetration depth. If a pulsed current is used, the arc energy can be precisely controlled and the control of the weld pool can be achieved, which is advantageous for thin plates or all-position welding.
2.1.3 welding process points
TIG welding is suitable for welding aluminum and its alloys with a thickness of less than 12mm. when the thickness is less than 3mm, single-pass welding is generally used on steel pads. When the thickness is 4 to 6 mm, it is usually welded by double-sided welding. when the thickness is larger than 6mm, shall beveling.
