JPH0366419A - Bending device for aluminum material - Google Patents

Abstract

PURPOSE:To obtain the bending product of good quality by providing a movable gyrodie ahead of a fixed die with the guiding hole for work and forming a cooling oil film by providing lubrication paths on both dies when a work which is forcibly guided is given a prescribed bending. CONSTITUTION:In a position in the vicinity of the outlet side of the fixed die 2, the lubrication path 6 for a cooling oil (O) is piercing formed in an upper die 2c. A gyrodie 3 is three-dimensionally turning and displacing operated and a work 10 is given with bending that the outlet part of the fixed die 2 is taken as a fulcrum. Also on the gyrodie, the lubrication path 7 communicating with the guiding hole 5 for work is piercing formed. The cooling oil (O) of soluble oil and the like is fed and the generation of seizure to the die 2, 3 and gnawing, etc. of the work 10 are prevented by lubrication action and cooling action. By this way, the work is free from the generation of surface flaws and a pre scribed bending is performed and the bending product of good surface quality is obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to an apparatus for bending aluminum materials, particularly an aluminum extrusion mold material as a workpiece, which is connected to a fixed mold and a movable gyro mold correspondingly arranged in front of the mold. This invention relates to a bending device that performs three-dimensional bending through cooperative action.

Conventional technology When bending long aluminum materials, especially extruded aluminum materials, used for building materials, machine parts, automobile parts, etc. into two-dimensional or three-dimensional shapes, there is a process called multi-bender. Bending machines equipped with a fixed mold and a movable gyro mold tend to be used favorably. The bending process using the multi-bender mainly utilizes the principle of compression bending in which the workpiece is bent while pushing it, so local elongation or compression of the material is relatively small and there is no possibility of material defects. This is advantageous in obtaining bent products with fewer surface defects.

Problems to be Solved by the Invention However, when bending an aluminum material using the multi-bender described above, especially when continuous bending is performed for a long time, the phenomenon of seizure and galling of the workpiece against the mold occurs. As a result, a situation occurs in which flaws occur in the workpiece, and smooth bending is often obstructed.

Conventionally, attempts have been made to improve this by subjecting the mold to surface treatments such as chrome plating to improve slipperiness. However, when the workpiece is made of aluminum in particular, The phenomenon still could not prevent this.

On the other hand, as shown in Fig. 3, a lubricant (0) is applied in advance to the workpiece (10) which is successively connected to the fixed mold (12) and the gyro mold (13) and subjected to bending. Although this has been confirmed to be quite effective, it was still insufficient to prevent burn-in and the like.

The object of the present invention is to improve a bending device in order to solve the above-mentioned problems.

Means for Solving the Problems As a result of various experiments and research aimed at solving the above-mentioned problems, the present inventors have discovered that the workpiece made of aluminum material and the inner surfaces of the fixed mold and the gyro mold to which it is electrically connected. If the bending process is performed while continuously supplying cooling oil between the parts, the bending process will be performed smoothly without galling or seizure with the mold, and without creating any harmful defects on the surface of the workpiece. He discovered this and completed this invention.

Accordingly, the present invention has a movable gyro mold that can be turned and displaced in three dimensions in front of a fixed mold having a workpiece conduction hole, and by the operation of the gyro mold, both molds are sequentially moved. In the bending device, the fixed mold and the gyro mold are provided with oil supply passages for supplying cooling oil to the workpiece conduction holes. The gist of the present invention is an apparatus for bending an aluminum material, characterized in that a cooling oil film is formed in the gap between the surface of the workpiece and the inner surface of the workpiece through hole during bending.

It is preferable that the oil supply passage be provided in the vicinity of the exit side of the fixed mold.

This is because the exit side of a stationary mold mainly constitutes a fulcrum for bending during bending, and is a part that comes into strong pressure contact with the workpiece and is likely to cause seizure and galling phenomena. For the gyro mold, a suitable oil supply passage may be provided in the middle part in the workpiece conduction direction.

On the other hand, the cooling oil used is a soluble oil that is commonly used for lubrication and cooling effects during cutting, polishing, etc., i.e., an oil that has been treated to be compatible with water, such as emulsified palm oil, Emulsified whale oil and the like are suitable. The use of other Emulsilon type lubricants is of course optional.

The workpiece conduction holes of the fixed mold and the gyro mold have a gap between them and the outer surface of the workpiece in order to form a uniform oil film of cooling oil between them and the workpiece.
It is necessary to maintain a clearance of approximately 2 m. If this clearance is less than 0.05 am, discontinuity of the oil film and breakage of the oil film will occur, and the workpiece will likely seize due to lack of oil. On the other hand, if the clearance is too large, exceeding 0.2, the accuracy of bending the workpiece will decrease. Preferably, the clearance is 0. It is best to set it to about 1 iw.

The aluminum material of the workpiece is mainly an aluminum extrusion molded material, and those made of various aluminum materials or aluminum alloy materials ranging from A100O series to 7000 series can be used.

The oil film formed between the surface of the aluminum workpiece and the stationary mold and the gyro mold prevents the workpiece from adhering to the bending mold due to its lubrication and cooling effects.
Prevents seizure and galling.

Embodiment In the illustrated embodiment, (1) is a bending device of a type generally called a multiventer, which comprises a fixed die (2) and a movable gyro die (3) correspondingly arranged in front of the fixed die (2). have

There are various types of fixed molds (2), but in the illustrated embodiment, the fixed mold (2) is of a type in which the workpiece conduction hole (4) in the center surrounds the workpiece (10) as shown in FIG. Left and right side molds (2a) (2
b), and the upper and lower molds (2C) and lower molds (2d). And work (lO)
A clearance of 0.005 to 0.2 degrees, preferably about 0.1 degree is formed over the entire circumference between the work piece and the inner surface of the workpiece through hole (4). Furthermore, at a position near the exit side, the upper mold (2C)
An oil supply passage (6) for the cooling oil (0) is formed with one outer end connected to the cooling oil supply pipe and one inner end communicating with the workpiece passage hole (4), from which the oil is supplied. The clearance is filled with cooling oil (0) to form an oil film (8) of a corresponding thickness.

On the other hand, the movable gyro mold (3) is mounted on a gyro mold mounting frame (as shown) that is movable up and down and left and right, and is disposed in front of the fixed mold (2). This gyro mold (3) is three-dimensionally turned and displaced using the gyro principle, and by operating it three-dimensionally, both molds (2) and (3) are The workpiece (10), which is forcibly moved in the direction of the arrow in Figure 1 through the workpiece passage holes (4) and (5), is subjected to three-dimensional bending with the exit side part of the fixed mold (2) as the fulcrum. It is intended to give. In addition, by moving the gyro mold (3) in the front-back direction and changing the distance between it and the fixed mold (2), the workpiece (lO
) can adjust the magnitude of the bending moment applied to the

Similarly to the fixed mold (2), the gyro mold (3) also has an oil supply passage (7) that communicates with the internal workpiece conduction hole (5) formed in the center, and the workpiece (l).
A predetermined clearance is formed between O) and the inner surface of the workpiece conduction hole (5), and this is filled with cooling oil (0) from the oil supply passage (7) to form an oil film (9). It is said to be Uruchino.

When performing a predetermined bending process on a workpiece (10) made of a long aluminum material using the above-mentioned bending apparatus,
The workpiece is forcibly pushed forward into the workpiece conduction hole (5) of the movable gyro mold (3) via the workpiece conduction hole (4) of the fixed mold (2). Then, by the turning displacement movement of the gyro mold (3), two-dimensional or three-dimensional,
Adds bending to the dimension. At this time, cooling oil (0) such as soluble oil is continuously supplied to the fixed mold (2) and the gyro mold (3) from the oil supply passages (6) and (7), and the workpiece (10) and There is an oil film (
8) (9) is formed and retained. Therefore, the frictional force between the workpiece (10) and each mold (2) and (3) is reduced due to its lubrication effect, and at the same time, the cooling effect of the cooling oil
In order to suppress the temperature rise of each mold (2) and (3) even in continuous evacuation, and to maintain the above-mentioned lubrication effect well, the molds (2) and (3) of the workpiece (10) Prevents the occurrence of seizure and galling phenomena. As a result, a predetermined bending process can be performed without causing surface flaws on the workpiece, and a bent product with good surface quality can be obtained.

Effects of the Invention According to the present invention, as described above, bending of a workpiece made of aluminum material is performed using cooling oil that is continuously supplied from the oil supply passages provided in the fixed mold and the gyro mold. This can be done by forming and maintaining an oil film between the surface and the inner surface of the workpiece through hole. Therefore, due to the lubrication and cooling effects of this cooling oil film, the workpiece can be bent smoothly without sticking to the mold or galling, resulting in high-quality bending without surface flaws. You can get the product.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line 1--1 in FIG. 1, and FIG. 3 is a side view showing a conventional example. (1)...Bending processing device, (2)...Fixed mold, (
3)...Gyro mold, (4)(5)...Workpiece conduction hole, (6)(7)...Oil supply passage, (8)(9)...
・Oil film, (10)...Work. Above Figure 1 Figure 3

Claims (1)

[Claims] A movable gyro mold that can be turned and displaced in three dimensions is provided in front of a fixed mold having a workpiece conduction hole, and the movement of the gyro mold causes both molds to become sequentially forcibly conductive to the workpiece. In a bending device designed to apply a predetermined bend, the fixed mold and the gyro mold are provided with oil supply passages for supplying cooling oil to the workpiece conduction holes, and the workpiece surface and the workpiece surface are connected to each other during bending. An apparatus for bending an aluminum material, characterized in that a cooling oil film is formed in a gap between the workpiece and the inner surface of the through hole.