CNC Machining: What are the Harms of Low Temperature to CNC Machining Aluminum Shell Parts

Extrusion of industrial CNC machining aluminum profile is affected by temperature: If the temperature during the extrusion of industrial CNC machining aluminum profile is too low, excessive deformation resistance will occur, which is easy to cause stuffiness and difficult to deform. When extruding high-magnesium alloy, duralumin and super-duralumin, when the proportion of equipment is small and the extrusion coefficient of aluminum profile is large, the probability of stuffiness is very high; if the heating temperature in the extrusion process of industrial CNC machining aluminum profile If it is too high, the deformation resistance will be reduced and the car will not be stuffy, but it must be produced by extrusion at a low speed. This problem seems simple, but in the actual industrial CNC machining of aluminum profile extrusion production process, the heating temperature and the control of the extrusion process and the mold temperature are often not in place, or high or low, resulting in stuffiness and extrusion.

Compression cracks always occur continuously; therefore, if the equipment capacity is insufficient for extruding hard aluminum alloy profiles, especially extruding high-magnesium alloys, it is best to extrude one or two pieces of soft alloy before production to increase the temperature of the mold. Re-entering the normal extrusion production process can significantly reduce the occurrence of stuffiness. Some companies call this "traction extrusion". If the extrusion temperature of industrial aluminum profiles is high and the extrusion speed is fast, cracks may occur immediately; In the current extrusion production of hard aluminum alloys, the proportion of cracked waste is basically always in the first place. For soft aluminum alloys, temperature does not have much effect on the extrusion process of aluminum profiles.

When the aluminum profile shell is CNC processed, the ambient temperature has an effect on the aluminum profile shell. As the extrusion conditions change, the extrusion temperature and extrusion speed are constantly changing. When extruding the aluminum profile shell, the extrusion temperature is low, the extrusion speed is slow, and the thermal conductivity of the aluminum profile shell is high.

What is the hazard of low temperature to the aluminum profile shell? What is the specific performance? When the aluminum profile shell is CNC processed, the ambient temperature has an effect on the aluminum profile shell. As the extrusion conditions change, the extrusion temperature and extrusion speed are constantly changing. When extruding the aluminum profile shell, the extrusion temperature is low, the extrusion speed is slow, and the thermal conductivity of the aluminum profile shell is high. What is the hazard of low temperature to the aluminum profile shell?
 

1. Structural changes

Generally speaking, when the aluminum profile shell cools, the material structure changes, which makes the material qualitative and exhibits anisotropy in performance. It may lose its original characteristics or change. At this time, it can only reduce the probability of mutation and guide it to develop in a direction that is beneficial to itself.

2. Lead to embrittlement of CNC machining

The change of the CNC machined aluminum profile shell will cause the damage of the crystal, the change of the crystal lattice, and the sharp drop of its own plasticity index, and the CNC machined aluminum profile shell will become fragile, fragile and easily deformed when used.

3. Affect physical and chemical properties

1. Low temperature will destroy the chemical structure of the aluminum profile shell, cause chemical reactions, destroy the original covalent bond, and corrode the aluminum shell.

2. The destruction of intergranular matter leads to disordered crystal grains.

3. Destroy the physical structure of the aluminum housing. When they are CNC machined for a long time at low temperature, the density will change and small damage will occur. Temperature has a great influence on the surface quality of extruded profiles, so the temperature in each process must be strictly controlled. The areas that need to be controlled include the temperature during the extrusion process and the temperature rise caused by friction during the extrusion process, the temperature of the ingot container, the temperature of the mold, the temperature of the aluminum rod, and the temperature of the heat treatment.