JPH04200928A - Bending machine - Google Patents

Abstract

PURPOSE:To prevent a work from gnawing, seizure, etc., by forming a feed case arranged behind a fixed die from Al material and giving surfaces of the feed case which comes in contact with a work lubricity. CONSTITUTION:The feed case 12 of a work feeder 3 arranged behind the fixed die is formed from Al material. Facing surfaces of case unit 12a containing the inside surfaces of a work communicating hole 12c of the feed case 12 are coated with surface treated layers 12d having lubricity, wear resistance of alumite film, fluoroplastic film, etc. The surface treated layers 12d give lubricating action to the work and gnawing and seizure to the feed case 12 by the work are prevented even in continuous transfer of the work. Consequently, bending of the work made of Al, etc., can be executed smoothly without generating surface flaws.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention is a tertiary method for extruding a workpiece made of metal such as aluminum by cooperating with a fixed mold and a movable gyro mold correspondingly arranged in front of the fixed mold. The present invention relates to a bending device that originally performs bending.

In this specification, the term aluminum is used to include its alloys.

Conventional technology When bending, for example, long aluminum extrusions used for building materials, machine parts, automobile parts, etc., into two or three dimensions, it has recently been Bending machines equipped with a fixed mold and a movable gyro mold have recently been used. Bending using a multi-bender bends the workpiece by bending it while pushing it, which is the principle of compression bending, so the local elongation of the material is relatively small. This is advantageous in obtaining bent products with fewer material defects and surface defects. Therefore, such a multi-bender has a mold called a feed case for guiding the workpiece, which has a workpiece conduction hole behind the fixed mold, in order to guide the workpiece being pushed to the fixed mold straight to the fixed mold. is generally deployed. The workpiece is guided and supported while being in contact with the inner surface of the through hole of the feed case, and is pushed to the fixed mold and then to the movable gyro mold.

However, the above feed case is conventionally 545C, 5S.
41 grade iron, so if the aluminum material is bent for a particularly long period of time, the surface of the aluminum material that is in sliding contact with the inner surface of the feed case conduction hole will be galled and seize, resulting in scratches on the workpiece. Smooth bending was often obstructed.

Moreover, since machining is not easy with iron feed cases, especially when the workpiece has a special shape, the machining accuracy of the feed case that should be adapted to the shape will be reduced, and this has the disadvantage that smooth workpiece feeding cannot be performed. there were.

The present invention has been made in view of the above technical background, and provides a bending device that can prevent the occurrence of galling, seizure, etc. of a workpiece caused by a feed case, and can process a complicated shape with high precision. For the purpose of providing.

Means to Solve the Problems The inventors of the present invention have conducted intensive experiments and research to achieve the above object, and as a result, they have formed the foot case from aluminum, and have provided a lubricating surface coating layer on the contact surface with the workpiece. If the workpiece is guided and supported by forming the workpiece, there will be no galling or seizure due to contact with the feed case, and the workpiece can be smoothly pushed and supported without causing any harmful defects on the surface of the workpiece. They discovered that it is possible to perform bending processes, and completed this invention.

That is, the bending device according to the present invention includes a fixed mold having a workpiece through hole, and a mold that is disposed in front of the fixed mold, also has the workpiece through hole, and is capable of turning and displacing in three-dimensional directions. A movable gyro mold, and a feed case for guiding a workpiece having a workpiece conduction hole arranged at a rear position of the fixed mold, the fixed mold and the movable gyro mold being guided and supported by the feed case. This bending device is configured to apply a predetermined bend to a workpiece that is sequentially forcedly conductive by the operation of a movable gyro mold, the feed case being formed of aluminum, and the feed case being made of aluminum. It is characterized in that a lubricating surface treatment layer is formed on at least the workpiece contact surface.

The type of the above-mentioned lubricating surface treatment layer is not particularly limited, and may be one that can ensure lubrication between the workpiece and the foot case and has good wear resistance, such as an anodized film (alumite film) or a fluororesin film such as Teflon. can be suitably employed.

Function In the above bending device, a lubricating surface treatment film is formed on the workpiece contact surface of the feed case, so the lubricating action of this surface prevents the workpiece from adhering to the foot case and prevents baking. This prevents sticking and galling. Moreover, since the feed case is made of aluminum, its machining is easy and the machining accuracy is improved.

Example The present invention will be explained in detail below.

In the bending and pressing device shown in Fig. 1, (1) is a fixed mold made of iron, (2) is a movable gyro mold also made of iron and placed in front of the fixed mold (1), and (3) is a movable gyro mold made of iron. (4) is a work feeder located at the rear of the fixed mold (1).
)(5) is a mold unit driving device.

The fixed mold (1) consists of a pair of upper and lower mold units (6) (6) arranged opposite each other, and between them is a workpiece with a circular cross section that is sized to fit the circumferential circular workpiece (A). A conduction hole (7) is formed. Each mold unit (6) (6) has a holding mold member (6a) on its inner surface, a restraining mold member (6b) on the inlet side, and a bending fulcrum mold member on the exit side of the same inner surface. (6c) are arranged adjacent to each other.

On the other hand, the movable gyro mold (2) is also made up of a pair of upper and lower mold units (9) (9) arranged opposite each other, and between them there is a mold of a size that also fits the circular workpiece (A). A workpiece conduction hole (10) having a circular cross section is formed. The gyro mold (2) is movable vertically and horizontally, and the gyro mold mounting is attached to a frame (not shown), and the gyro mold (2) can be turned and displaced three-dimensionally using the gyro principle. Ru.

The mold unit drive devices (4) and (5) are of an electromagnetic type or the like, and as shown in FIG.
1) and the movable mold (2), and the mold units (6) and (9) are connected to the conductive holes (7) (
1,0) is operated so as to come into pressure contact with the outer peripheral surface of the workpiece (A).

On the other hand, the work feeder (3) includes a cylindrical feed case (12) and a pusher (13) that runs in the front-rear direction inside the feed case (12). Further, the feed case (12) is a pair of upper and lower cases (1,
2a ) (12a ), and these case units (1, 2a ) (12a ) are slit-(12b
), and has a workpiece conduction hole (1, Oc) with a circular cross section and a size that also fits the workpiece (A) in the center between them. In addition, push metal (1
3) connects the projecting pieces (13a) provided on both sides to the left and right slits (L2b) of the feed case (12).
) and protrudes to the side of the case (12), and is moved by operating a drive device connected to the projecting piece (13a), and transfers the workpiece (A) to the fixed mold (1) side. It is assumed that

By the way, the above-mentioned feed case (12) is made of aluminum from the viewpoint of ease of processing and weight reduction. The material of aluminum is not particularly limited, and may include 5000 series alloys such as 5052.5NO], 5056, etc.
7NO], 7000 such as 7003.7075.7078
type alloys and other alloys may be used as appropriate. Moreover, as shown in FIG.
) A surface treatment layer (12d) having lubricity and wear resistance, such as an alumite film, Teflon or other fluororesin film, is formed on the opposing surface of (12a). The thickness of this surface treatment layer (12d) is not particularly limited. Moreover, combined with the fact that the feed case itself is made of aluminum, the adhesion of these films is excellent.
The lubricating effect can be demonstrated more effectively over a long period of time.

Three-dimensional bending of a circumferentially circular work by the bending apparatus described above is performed as follows. First, place the workpiece (A) in the feed case (12), and use the pusher metal (13) to push the tip of the workpiece (A) into the through hole (7) of both molds (1) and (2).
(10) is electrically connected. At this time, the workpiece (A) is guided to the fixed mold (1) while slidingly contacting the inner surface of the through hole (12c) of the feed case (12), or
12c) Lubricating surface treatment 1' coated on the inner surface of
W (12d) exerts a lubricating effect on the workpiece (A), and the continuous transfer of the workpiece (A) also prevents the workpiece from galling or seizing against the feed case (12). Then, each mold unit driving device (4) (5) is driven to press the inner surface of the mold unit (6) (9) against the outer circumferential surface of the workpiece (A), and the workpiece (A) is rotated in the direction of rotation. Constrain displacement. Note that the pressure force applied to the workpiece (A) is such that the workpiece (A) does not rotate during the three-dimensional bending process, and the mold (1)
) (2) It is determined based on calculated values, empirical data, etc. within a range that does not impede the conduction of the workpiece (A) into the interior.

In the pressed state, the pusher (13) is driven forward and the movable gyro mold (2) is operated three-dimensionally to bend the workpiece (A) three-dimensionally. At that time, even if a couple acts on the workpiece due to a change in the center of gravity position of the processed part that draws a three-dimensional shape in front of the movable gyro mold, the workpiece will not rotate due to the pressure contact force. do not have.

Note that the configurations of the fixed mold (1), the movable gyro mold (2), etc. do not affect the requirements of the present invention, and therefore, these are not limited to those of the illustrated embodiment.

Effects of the Invention As described above, in the multi-bender type bending device of the present invention, the feed case for guiding and supporting the work placed behind the fixed die is formed of aluminum, and at least the workpiece contact of the feed case is made of aluminum. Since a lubricating surface treatment layer is formed on the surface, the lubrication effect of this surface prevents the workpiece from adhering to the feed case.
Seizing and galling are prevented. Therefore, a workpiece made of aluminum or the like can be smoothly bent without surface flaws, and a bent product of good quality can be obtained.

Moreover, since the 11 feed cases are made of aluminum, they can be processed easily and with high precision, and the feed cases can be sufficiently adapted to complex workpiece shapes. Furthermore, due to the lightweight nature of aluminum, the weight of the feed case itself can be reduced.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing the overall structure of the bending device, and FIG. 2 is a cross-sectional view taken along the line ■--■ in FIG. 1. (1)...Fixed mold, (2)...Movable mold, (7)
(10)... Work continuity hole, (12)... Feed case, (12c)... Work continuity hole, (1, 2d)
...Surface treatment layer. ” ni

Claims (1)

[Scope of Claims] A fixed mold having a workpiece conduction hole, and a movable gyro mold disposed in front of the fixed mold, also having a workpiece conduction hole and capable of turning and displacing in three dimensions. , a feed case for guiding a workpiece having a workpiece conduction hole disposed at a rear position of the fixed mold, and sequentially forcibly conducts the fixed mold and the movable gyro mold while being guided and supported by the feed case. A bending device that applies a predetermined bend to a workpiece by the operation of a movable gyro die, the feed case being formed of aluminum, and at least the workpiece contact surface of the feed case being lubricated. A bending device characterized by having a surface treated layer formed thereon.