Tractor seat handle open files after bending smaller

2013-07-08 15:47:38

1 Parts Features

Figure 1 shows a U-shaped curved parts of the handle Trolley EM31 type seat, using the material of A3 steel, material thickness of 3mm. In order to ensure a smooth hand seat and gearbox assembly requires bending the left end to ensure open file size 122 + points to 0. The open file handle right seat size is less demanding, even a slight tolerance does not affect assembly and use.

Problems 2 bending

Conventional production show: In Figure 2 shows a pressure-die holder on the handle to ensure the bending of the left side of handlebar holder open file size requirements. Recently produced a number of open file handle seat when size becomes small. After testing showed that the left port unit size: 122 +6' o the actual size of the 121.10 ~ 122.2 between the beating.

3 Reasons

122 +1.0 caused because the actual size of the small blank uneven, into the arc-shaped, as shown in Figure 2. In bending forming, pulled into the die blank state has an uneven surface correction, but did not die state of the uneven surface of the blank to improve small and small contact surface with the punch, which almost only handle seat mouth in contact with the punch unit. At this time the size of the handle seat mouth slightly punch equal size. Since the mouth portion of the handle seat deformation of the blank is mainly elastic deformation, so the punch from the extrusion die, the part blanks. Material for "elastic recovery" leaving open the file size is smaller than the punch size.

Four measures to solve the problem

For blanks cause uneven hand seat open files after bending smaller problems, is generally used after the first turn shaped billet leveling ways to solve. But this method to increase the leveling process, improve stampings costs. We handle seat according to the characteristics of components using the following more economical solution to the problem.

The crank press shut height adjustment slightly bigger, slightly raise the slider open, reducing the stroke end when the press bending of the correction force, bending attenuation correction, increasing the handlebar holder root rebound, thereby increasing the hand the seat open file size to ensure that the 98% of the left hand seat port portion size reached 122 +6'0 requirements.

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