Aluminium section bar segmentation speed expressing technique
Technical field
The present invention relates to a kind of aluminium section bar segmentation speed expressing technique.
Background technology
General extruder has the function of constant speed and Duan Su for production choice for use, although wherein constant speed extruding can protect outlet temperature and speed is basically identical under certain condition, but check the product head comparing and squeeze out when using constant speed, middle part, the change in size of afterbody, can find to compare the difference having 0.1mm ~ 0.4mm end to end, this is because breakthrough pressure when using constant speed extruding to start is high, mould is caused by work strip is outwards tiltedly dehisced in a high voltage state, when pressure declines gradually, die working length returns to normal condition dimensionally stable, but when being expressed to afterbody metal flow and turbulent flow and metal quantity delivered deficiency occurring, change in size starts again to have occurred, therefore there is the defect that difference in size end to end appears in extruded product in constant speed extruding.
Summary of the invention
The technical problem to be solved in the present invention is the above-mentioned defect how overcoming prior art, provides a kind of aluminium section bar segmentation speed expressing technique.
For solving the problems of the technologies described above, this aluminium section bar segmentation speed expressing technique comprises the following steps,
1) first section of low speed extruding:
Extrusion speed is set as 3.0mm/s, press-in aluminium ingot, start die mould;
2) stage casing constant speed pressurization:
After the section bar squeezed out through step 1) reaches stabilizing distance, speed of extruder is set as 3.5mm/s, constant speed extrudes;
3) latter end high-speed extrusion
When through step 2) after the section bar distance discharging end that squeezes out exceedes stabilizing distance, extrusion speed is set as 3.8mm/s, is squeezed to whole section bar extrusion.
As optimization, the stabilizing distance described in step 1) is preferably 3000mm.
As optimization, the stabilizing distance described in step 3) is preferably 3000mm.
Design like this, carries out corresponding extrusion process to the stem of aluminium section bar, middle part, afterbody respectively by segmentation speed, reduces the size disparity end to end even eliminating extruded product.
The technological process of aluminium section bar segmentation of the present invention speed expressing technique is simple, concrete operations convenient, overcomes the size end to end that traditional constant speed extrudes the extruded product of existence and exists and can not eliminate the defect of gap, be extensively suitable for extruding of all kinds of aluminium section bar.
Detailed description of the invention
This aluminium section bar segmentation speed expressing technique comprises the following steps,
1) first section of low speed extruding:
Extrusion speed is set as 3.0mm/s, press-in aluminium ingot, start die mould;
2) stage casing constant speed pressurization:
After the section bar squeezed out through step 1) reaches 3000mm, speed of extruder is set as 3.5mm/s, constant speed extrudes;
3) latter end high-speed extrusion
When through step 2) the section bar distance discharging end that squeezes out more than 3000mm after, extrusion speed is set as 3.8mm/s, is squeezed to whole section bar extrusion.
The present invention includes but be not limited to above-mentioned embodiment, any product meeting these claims and describe, all falls within protection scope of the present invention.