CN101837403A - Alignment pressure head - Google Patents

Abstract

A straightening indenter includes an indenter body, and the straightening surface of the indenter body includes grooves of three sizes, the grooves of which are R1 groove, R2 groove and R3 groove respectively, and the radius of the R1 groove is 2 larger than the radius of the R2 groove -4 mm, the radius of R3 groove is larger than the radius of R2 groove, and intersects with R2 groove according to the shape of the bell mouth. There is a hard rubber pad on the inner circle of R1 groove. During the straightening process, the indenter body contacts with the curved pipe body, gradually Press the pipe body straight, since the grooves of the three sizes are slightly larger than the outer circle radius of the straightened pipe body, when the pipe body is deformed by pressure, the pipe body and the R1 groove and R2 groove equipped with hard rubber pads are within the elastic deformation range The inside is tightly fitted, thereby greatly increasing the contact area between the straightened pipe body and the indenter, and preventing local deformation; because the invention is provided with R3 grooves, when the deformation is reversed, the pipe body will not be partially deformed by the two sides of the indenter. crushed.

Description

a straightening head

technical field

The invention relates to a straightening mechanism component, in particular to a straightening pressure head.

Background technique

When the circular pipe body is bent, it needs to be straightened. The existing straightening mechanism generally uses a V-shaped indenter to support the two ends of the pipe body. Bend and deform for straightening purposes. This method is widely used in industrial production, but the main disadvantage of this straightening method is: the V-shaped indenter contacts the tube body from two points to two lines, and the contact area is too small, making many tubes The body is partially concave and deformed during the straightening process.

Contents of the invention

In order to overcome the above-mentioned defects in the prior art, the object of the present invention is to provide a straightening pressure head, in the straightening process, the contact of the line is converted into the contact of the surface, the contact area is large, and the pipe body is avoided in the straightening process. local deformation in .

In order to achieve the above object, the technical solution of the present invention is achieved as follows: a straightening indenter includes an indenter body 1, and the straightening surface of the indenter body 1 includes grooves of three sizes, and the grooves of the three sizes are respectively R1 Groove, R2 groove and R3 groove, the radius of R1 groove is 2-4mm larger than the radius of R2 groove, the radius of R3 groove is larger than the radius of R2 groove, and intersects with R2 groove according to the shape of the bell mouth, and there is a hard rubber pad 2 on the inner circle of R1 groove .

The inner radius of the R1 groove is 2.3-5 mm larger than the outer diameter of the pipe to be straightened, the inner radius of the R2 groove is 0.3-1 mm larger than the outer diameter of the straightened pipe, and the inner radius of the R3 groove is larger than the outer diameter of the straightened pipe. The radius of the outer circle of the tube is 2-4 mm larger, and intersects with the R2 groove in a bell-shaped shape.

Because the inner circle of the R1 groove of the present invention is provided with a hard rubber pad 2, the pipe body will not be partially deformed when it is straightened; because the grooves of the three sizes are slightly larger than the outer circle radius of the straightened pipe body, when the pipe body When subjected to pressure deformation, the pipe body and the R1 groove and R2 groove equipped with hard rubber pad 2 are closely fitted within the elastic deformation range, thereby greatly increasing the contact area between the straightened pipe body and the indenter, and preventing local deformation ; Since the present invention is provided with the R3 groove, when the anti-deformation occurs, the pipe body will not be partially crushed by both sides of the indenter.

Description of drawings

Fig. 1 is a schematic structural view of the present invention.

FIG. 2 is a side view of FIG. 1 .

Detailed ways

The structural principle and working principle of the present invention will be described in detail below in conjunction with the accompanying drawings.

Referring to Figure 1 and Figure 2, a straightening indenter includes an indenter body 1, and the straightening surface of the indenter body 1 includes grooves of three sizes, the grooves of which are respectively R1 groove, R2 groove and R3 groove, The radius of the R1 groove is 2-4 mm larger than the radius of the R2 groove, the radius of the R3 groove is larger than the radius of the R2 groove, and intersects with the R2 groove according to the shape of the bell mouth, and the inner circle of the R1 groove is provided with a hard rubber pad 2. When the pipe body is aligned, Local deformation will not occur; the inner radius of the R1 groove is 2.3-5 mm larger than the outer diameter of the straightened pipe, the inner radius of the R2 groove is 0.3-1 mm larger than the outer diameter of the straightened pipe, and the inner radius of the R3 groove is larger than the outer diameter of the straightened pipe. The radius of the outer circle of the straightened pipe is 2-4mm larger, and it intersects with the R2 groove according to the shape of the bell mouth. The inner tight fit greatly increases the contact area between the straightened pipe body and the indenter, and prevents local deformation. The R3 groove prevents the pipe body from being partially crushed by both sides of the indenter when it is reversely deformed.

The working principle of the present invention is: during the straightening process, the indenter body 1 is in contact with the bent pipe body, and a certain force is applied, and the hard rubber pad 2 in the R1 groove is squeezed and deformed. When the pressure makes it higher than the R1 groove When the hard rubber pad 2 is pressed to the same radius as the R2 groove, the metal part of the R2 groove starts to contact the bent pipe body. The concentrated compressive stress in the middle of the curved pipe body, and because the hardness of the hard rubber pad 2 is lower than that of the pipe body, the concentrated compressive stress in the middle of the pipe body is dispersed; it will not cause local depressions in the middle of the curved pipe body. As the pressure further increases, the curvature of the bent pipe body under the push of the indenter body 1 gradually decreases, and the contact area between the metal part of the inner diameter of the R2 groove and the bent pipe body also increases. The pressure increase per unit area of the bent pipe body is not much. As the pressure increases, the pipe body is gradually straightened. In order to prevent the temporarily straightened pipe body from rebounding, the pressure head body 1 needs to continue to press down to make the pipe body The body produces a certain amount of anti-deformation, and the R3 groove prevents the pipe body from being partially crushed by both sides of the indenter when the anti-deformation occurs. When a certain amount of anti-deformation is met, the indenter body 1 is withdrawn, and the pipe body is straightened.

Claims (2)

1. alignment pressure head, comprise a pressure head body (1), it is characterized in that, pressure head body (1) alignment face comprises the groove of three kinds of sizes, the groove of three kinds of sizes is respectively R1 groove, R2 groove and R3 groove, and the R1 groove radius is than the big 2-4 millimeter of R2 groove radius, and the R3 groove radius is greater than the R2 groove radius, and crossing according to bell mouth shape and R2 groove, circle is provided with hard rubber pad (2) in the R1 groove.

2. a kind of alignment pressure head according to claim 1, it is characterized in that, the radius of circle ratio is by the big 2.3-5 millimeter of alignment body exradius in the described R1 groove, the radius of circle ratio is by the big 0.3-1 millimeter of alignment body exradius in the R2 groove, radius of circle compares by the big 2-4 millimeter of alignment body exradius in the R3 groove, and intersects according to bell mouth shape and R2 groove.

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