JPS5966928A - Bending method - Google Patents

Abstract

PURPOSE:To obtain press forming goods having high accuracy without generating an irregular deformation by putting a dummy core in a cavity so that a die can move horizontally, and executing a slow descending press, when bending an Al die material having a cavity of a double flange. CONSTITUTION:A dummy core 5 is put in a cavity 4 of an extruding Al die material 1 which has double flanges 2, 3 in the longitudinal direction and has a large cavity 4 between them. On the other hand, a die 6 is fitted to a bed 7 so that its horizontal movement is allowed a little, and a slow descending press is executed by a punch 8. In this way, deformation of the flanges 2, 3 is prevented by the core 5. Also, in case stress becomes different locally due to variations of hardness and hitting to the dies 6, 8 becomes irregular, since the die 6 can move horizontally and the slow descending press is executed, the die 6 is shifted, absorbs irregularity of the hitting, and no irregular deformation is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of bending an aluminum profile used, for example, as a cover frame of a lighting device, and which has a double 2-lunge recess.

For example, an extruded aluminum profile 1 having double flanges 2 and 3 in the longitudinal direction shown in the first factor and a large recess 4 between them is placed in a first part perpendicular to the surface of the profile main body l as shown by the chain line in the same figure. This process relates to bending and forming the flange 2 at right angles to its longitudinal direction.

When attempting to bend a material with such a shape into the directional relationship shown in the figure, the material may shrink in areas where the plastic deformation limit of the material is exceeded, such as cracks φ twisting at the outer periphery where the material is stretched. Appearance defects such as wrinkles and twists occur on the inner periphery that is bent.

This is true even if a material with good malleability, such as an aluminum alloy, is used.
This is likely to occur if the radius of bending is small, and in the past, such a processing method was considered impossible, and only a portion of this corner was joined with a cast part, but this poses many problems in terms of cost, aesthetics, and strength.

The present invention relates to a method that solves these problems and makes it possible to perform the bending process with the necessary flat diameter R. In this method, a discarded core 5 is placed in the recess 4, and the die 6 is moved horizontally onto the bed 7. This is a processing method characterized by attaching and gently pressing to allow for. Reference numeral 8 is a punch, 9I and 92 are holder holders, 10 and 11 are port nuts for fixing the die 6 to the holder 9I, 12 is a bolt for fixing the holder 92 to the die 6, and 13 is a holder. .

Since the present invention has the above-mentioned configuration, deformation of the double 2 flange 2113 during press working is prevented by the disposable core 5 placed in the recess 4, and the stress varies locally due to variations in hardness. If an unevenness occurs in the hit, the die 6 is horizontally movable and has a gentle release brace, so the die 6 shifts and absorbs the unevenness in the hit, preventing irregular deformation. A highly accurate press-formed product can be obtained.

[Brief explanation of the drawing]

The drawings illustrate an apparatus for carrying out the method of the invention, h
Figure '41 is a perspective view of the material, Figure 2 is a front view of the die and punch, Figure 3 is a side view thereof, and Figure 4 is an enlarged cross-sectional view of 733. 1 is the material, 2Φ3 is the double flange, 4 is the four parts, 5 is the disposable core, 6 is the die, and 8 is the punch.

Claims (1)

[Claims] (+) When bending an aluminum piece with a double flange and a recess between them, insert a discarded core into the recess,
A bending method characterized by gentle pressing while supporting the die to allow horizontal movement.