CN103157684A - Aluminum profile graded-speed extrusion process - Google Patents

Abstract

The invention relates to an aluminum profile graded-speed extrusion process. The general extruder has the functions of constant speed and variable speed which are selected by the production of a product, wherein the constant-speed extrusion can guarantee the basic consistency of the outlet temperature and the speed under certain condition, but the head and the tail have a difference of 0.1mm-0.4mm when the size changes at the heat part, the middle part and the tail part of the product extruded in the constant speed are checked and compared. The aluminum profile graded-speed extrusion process comprises the following steps: (1) a first-section low-speed extrusion; (2) the middle-section constant speed pressurizing; (3) the tail-section high-speed extrusion. The aluminum profile graded-speed extrusion process provided by the invention is simple in process flow, and convenient to specifically operate, overcomes the defects that the sizes at the head and the tail of the product extruded in the traditional constant speed have irreversible difference, and is widely suitable for the extrusion of various aluminum profile.

Description

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 the production choice for use, although wherein constant speed extruding can be protected outlet temperature and speed is basically identical under certain condition, but check the product head that squeezes out when relatively using constant speed, the middle part, the change in size of afterbody, can find to compare end to end the difference that 0.1mm～0.4mm is arranged, this is because the breakthrough pressure that uses constant speed to push when beginning is high, mould work under high pressure conditions the band outwards tiltedly dehisce due to, when pressure descends gradually, die working length returns to the normal condition dimensionally stable, but when being expressed to afterbody metal flow generation turbulent flow and metal quantity delivered deficiency, change in size begins again to have occurred, therefore the constant speed extruding exists extruded product the defective of difference in size end to end to occur.

Summary of the invention

The technical problem to be solved in the present invention is the defects that how to overcome prior art, and a kind of aluminium section bar segmentation speed expressing technique is provided.

For solving the problems of the technologies described above, this aluminium section bar segmentation speed expressing technique comprises the following steps,

1) first section low speed extruding:

Extrusion speed is set as 3.0mm/s, is pressed into aluminium ingot, the start die mould;

2) stage casing constant speed pressurization:

After the section bar that squeezes out through step 1) reaches stabilizing distance, speed of extruder is set as 3.5mm/s, the constant speed extruding;

3) latter end high-speed extrusion

When through step 2) after the section bar that squeezes out surpasses stabilizing distance apart from the discharging end, extrusion speed is set as 3.8mm/s, be squeezed to whole section bar extrusions.

As optimization, the described stabilizing distance of step 1) is preferably 3000mm.

As optimization, the described stabilizing distance of step 3) is preferably 3000mm.

So design, carry out corresponding extrusion process to stem, middle part, the afterbody of aluminium section bar respectively by segmentation speed, reduces even to eliminate the size disparity end to end of extruded product.

The technological process of aluminium section bar segmentation of the present invention speed expressing technique is simple, concrete operations convenient, has overcome traditional constant speed and has extruded the size end to end of the extruded product of existence and exist and can not eliminate the defective of gap, and extensively applicable all kinds of aluminium section bars extrudes.

The specific embodiment

This aluminium section bar segmentation speed expressing technique comprises the following steps,

1) first section low speed extruding:

Extrusion speed is set as 3.0mm/s, is pressed into aluminium ingot, the start die mould;

2) stage casing constant speed pressurization:

After the section bar that squeezes out through step 1) reaches 3000mm, speed of extruder is set as 3.5mm/s, the constant speed extruding;

3) latter end high-speed extrusion

When through step 2) after the section bar that squeezes out surpasses 3000mm apart from the discharging end, extrusion speed is set as 3.8mm/s, be squeezed to whole section bar extrusions.

The present invention includes but be not limited to above-mentioned embodiment, any product that meets the description of these claims is within all falling into protection scope of the present invention.

Claims (3)

1. aluminium section bar segmentation speed expressing technique, it is characterized in that: this technique comprises the following steps,

1) first section low speed extruding:

Extrusion speed is set as 3.0mm/s, is pressed into aluminium ingot, the start die mould;

2) stage casing constant speed pressurization:

After the section bar that squeezes out through step 1) reaches stabilizing distance, speed of extruder is set as 3.5mm/s, the constant speed extruding;

3) latter end high-speed extrusion

When through step 2) after the section bar that squeezes out surpasses stabilizing distance apart from the discharging end, extrusion speed is set as 3.8mm/s, be squeezed to whole section bar extrusions.

2. aluminium section bar section according to claim 1 speed expressing technique, it is characterized in that: the described stabilizing distance of step 1) is 3000mm.

3. aluminium section bar section according to claim 1 speed expressing technique, it is characterized in that: the described stabilizing distance of step 3) is 3000mm.