JP2004528480A - Processing parts for bending machines - Google Patents

Abstract

A method for prolonging service life of a machine for bending tubes comprises flame spraying a coating of less than 0.1 mm of molybdenum or molybdenum alloy to at least one surface of a fold smoothing tool.

Description

【Technical field】
[0001]
The present invention relates to a processing member for a tubular article bending or shape shaping bending machine.
[Background Art]
[0002]
In bending using a tubular article bending machine, in many cases, a tubular article is fixed and bent by pulling out its free end. However, due to the floating of the material, folds (wrinkles) are formed inside the bent portion. ) Is easy to occur. In order to prevent this, a processing member for suppressing fold formation, that is, a fold correcting member is used. The straightening member can take various forms and is sometimes referred to as a fold straightening body or fold straightening shoe. It supports the tubular article inside the plastic deformation zone in the direction of the part currently being bent. During bending, the tubular article is stretched while being subjected to a large pressing force by the folding member, so that considerable wear occurs in the folding member. To prevent wear on the buckling member, the tubular article is protected by the addition of aluminum bronze, beryllium bronze and other similar bronze-based materials. Moreover, the straightening members are severely damaged and need to be replaced quite often. For example, use of a lubricant such as a molybdenum lubricating agent or titanium nitrite or titanium carboxynitrite has been attempted, but it is known that none of them is useful for extending the service life.
[0003]
In bending, a columnar member, a roll member, a guide auxiliary member, a matrix, and a guide strip are required, and although these need not be frequently replaced with new ones, they are also subjected to a strong load. .
DISCLOSURE OF THE INVENTION
[0004]
An object of the present invention is to provide a possibility of extending the service life of a processing member in a tubular article bending machine or shape shaping machine.
[0005]
The above object is achieved by using a processing member such as a straightening member, a columnar member or a guide strip described in the characterizing clause of claim 1.
[0006]
Subsequently, the surfaces of the fold straightening member and the cylindrical member that come into contact with the tubular member by the roll member, the guide auxiliary member, the matrix or the guide strip are coated with molybdenum or a molybdenum alloy. Although the thickness of this coating layer is less than 0.1 millimeter, it still allows for a sufficiently long service life. This molybdenum is applied to the surface by, for example, flame spraying, electroplating or vapor deposition.
[0007]
(Example 1)
FIG. 1 illustrates an example of a columnar member type bending machine for bending a tubular article. The bending operation is achieved by pulling the tubular article 1 by the fastening member 2 while rotating the matrix 3. The guide strip 4 and the fold straightening member 5 facilitate the outward guidance, and the diameter of the tubular article 1 is changed by appropriately selecting various cylindrical members 6 installed therein. Not to be. The surface of the guide strip 4, the folding member 5, and the columnar member 6 that keeps contact with the tubular article 1 is coated with molybdenum or a molybdenum alloy.
[0008]
FIG. 2 illustrates an example of the straightening member 5 having a protective layer 7 formed on a surface 8 that contacts the tubular article.
[Brief description of the drawings]
[0009]
FIG. 1 is a cross-sectional view showing a columnar member type bending mechanism for bending a tubular article according to the present invention;
FIG. 2 is a perspective view of a straightening member having a protective layer formed on a surface that contacts a tubular article.
[0010]
DESCRIPTION OF SYMBOLS 1 Tubular article 2 Fastening member 3 Matrix 4 Guide strip 5 Straightening member 6 Columnar member 7 Coating layer 8 Surface contacting external shape

Claims (2)

A tubular member or a processing member for a shape-shaping / bending machine, wherein a surface (8) contacting the tubular article or an external shape is coated with a coating layer (7) made of molybdenum or a molybdenum alloy. 2. The processing member according to claim 1, wherein the thickness of the coating layer is 0.1 mm or less.

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