CN111266780A

CN111266780A - Method for improving positioning strength of built-in clamp

Info

Publication number: CN111266780A
Application number: CN202010137912.9A
Authority: CN
Inventors: 周川川; 王子欣; 高建昊; 蔡金生; 刘洋; 谷昊; 李长松; 毛柏吉
Original assignee: FAW Group Corp
Current assignee: FAW Group Corp
Priority date: 2020-03-03
Filing date: 2020-03-03
Publication date: 2020-06-12
Anticipated expiration: 2040-03-03
Also published as: CN111266780B

Abstract

The invention belongs to the technical field of automobile body-in-white, and particularly relates to a method for improving the positioning strength of a built-in clamp. The method comprises the following steps: step one, arranging fixed positions of a first supporting unit and a second supporting unit at two sides of the gravity center of a side wall assembly; designing and mounting a first supporting unit and a second supporting unit; step three, installing a first supporting unit and a second supporting unit on site, measuring X, Y, Z data of the contour block by three coordinates, and adjusting the first supporting unit and the second supporting unit to theoretical positions; and step four, adjusting the pressure control valves of the first supporting unit and the second supporting unit by combining the load variation of the positioning pin of the side wall assembly. According to the invention, the influence of the gravity of the side wall assembly on the strength of the turnover positioning pin is eliminated by a method of adding the side wall assembly supporting unit through the floor clamp, and the problem of insufficient positioning strength of the existing built-in clamp is solved.

Description

Method for improving positioning strength of built-in clamp

Technical Field

The invention belongs to the technical field of automobile body-in-white, and particularly relates to a method for improving the positioning strength of a built-in clamp.

Background

The main splicing and positioning mode of the white automobile body comprises a built-in clamp and an external clamp, in order to meet the requirement of welding accessibility, a plurality of host factories adopt the built-in clamp positioning mode, but the positioning hole of the side wall assembly is arranged on the outer side of the automobile body, the built-in clamp needs to meet the positioning requirement of the side wall assembly, a turning unit needs to be added on the side wall positioning pin unit of the built-in clamp, the strength of the positioning unit is reduced, and the side wall positioning pin is subjected to the influence of the gravity of the side wall assembly and then is sunk to the Z direction.

Disclosure of Invention

The invention provides a method for improving the positioning strength of a built-in clamp, which solves the problem that the positioning strength of the existing built-in clamp is insufficient by eliminating the influence of the gravity of a side wall assembly on the strength of a turnover positioning pin by a method of adding a side wall assembly supporting unit through a floor clamp.

The technical scheme of the invention is described as follows by combining the attached drawings:

a method for improving the positioning strength of a built-in clamp comprises the following steps:

step one, arranging fixed positions of a first supporting unit and a second supporting unit at two sides of the gravity center of a side wall assembly;

step two, calculating a supporting force F1 of the first supporting unit and a supporting force F2 of the second supporting unit according to the fixed positions of the first supporting unit and the second supporting unit, and selecting an air cylinder and a pressure control valve required by the first supporting unit and the second supporting unit according to the supporting force F1 of the first supporting unit and the supporting force F2 of the second supporting unit;

step three, installing a first supporting unit and a second supporting unit on site, measuring X, Y, Z data of a first contour block 1 in the first supporting unit and a second contour block 9 in the second supporting unit in a three-coordinate mode, and adjusting the first supporting unit and the second supporting unit to theoretical positions;

and step four, adjusting the pressure control valves of the first supporting unit and the second supporting unit by combining the load variation of the positioning pin of the side wall assembly, and ensuring that the distance variation of the supported positioning pin of the side wall assembly is within +/-0.1 mm from the theoretical value in the load state.

The invention has the beneficial effects that:

the invention can perfectly solve the influence of gravity on the positioning precision of the positioning pin and realize the precision requirement of +/-0.1 mm of the built-in clamp unit.

Drawings

FIG. 1 is a schematic diagram illustrating the calculation of the supporting force according to the present invention;

FIG. 2 is a schematic structural diagram of a first supporting unit according to the present invention;

FIG. 3 is a schematic structural diagram of a second supporting unit according to the present invention;

fig. 4 is a schematic view of the installation of the side wall positioning and supporting unit.

In the figure: 1. a first contour block; 2. a first cylinder; 3. a first connecting plate; 4. a slider; 5. a slide rail; 6. a first support; 7. a trunnion seat; 8. welding the frame; 9. a second contour block; 10. a first connecting seat; 11. a second cylinder; 12. a second connecting plate; 13. a transition plate; 14. a second support; 15. a Z-direction limiting block; 16. and a second pressure control valve.

Detailed Description

step one, arranging fixed positions of a first supporting unit and a second supporting unit at two sides of the gravity center of a side wall assembly, wherein the supporting positions are selected in a range from 1/4 doorsills to 1/3 doorsills at the two sides of the gravity center;

referring to fig. 1, the supporting force F1 of the first supporting unit and the supporting force F2 of the second supporting unit are calculated by the following formulas:

F1+F2＝G

F1*L1＝F2*L2

wherein G is the gravity of the side wall assembly; l1 is the vertical distance of the supporting force F1 to the gravitational force G; l2 is the vertical distance of the support force F2 from the gravitational force G.

After the supporting force F1 and the supporting force F2 are calculated, a manual is searched to find a proper air cylinder and a proper pressure control valve.

Step three, installing a first supporting unit and a second supporting unit on site, and adjusting supporting blocks in the first supporting unit and the second supporting unit to theoretical positions;

referring to fig. 2, the first supporting unit includes a first contour block 1, a first cylinder 2, a first connecting plate 3, a slider 4, a slide rail 5, a first support 6, and a trunnion seat 7; the first contour block 1 is fixed on the first connecting plate 3 through a first connecting block; the first support 6 is fixed on the clamp substrate; the fixed end of the first cylinder 2 is fixed on the first support 6; the movable end of the first cylinder 2 is connected with an ear shaft seat 7; the trunnion seat 7 is fixed with one end of the first connecting plate 3; the other end of the first connecting plate 3 is fixed with the sliding block 4; the sliding block 4 slides on the sliding rail 5; the slide rail 5 is fixed on the welding frame 8; and a first pressure control valve is arranged on the first cylinder 2.

Referring to fig. 3, the second supporting unit includes a second contour block 9, a first connecting seat 10, a second cylinder 11, a second connecting plate 12, a second support 14, and a Z-direction stopper 15; a gasket is arranged between the second contour block 9 and the first connecting seat 10 and is fixed through a bolt; the fixed end of the second cylinder 11 is fixed with one end of a second connecting plate 12; the movable end of the second cylinder 11 is fixed with a transition plate 13 at the lower end of the first connecting seat 10; the other end of the second connecting plate 12 is fixed with a second support 14; the fixed end of the Z-direction limiting block 15 is fixed on the second connecting plate 12 through a second connecting block; the movable end of the Z-direction limiting block 15 is fixed on the transition plate 13; the fixed end of the Z-direction limiting block 15 limits the movable end; and a second pressure control valve 16 is mounted on the second cylinder 11.

Mounting the first and second support units, mapping X, Y, Z data of the first and second contour blocks 1 and 9 at three positions, and adjusting the first and second support units to designed theoretical positions.

And fourthly, positioning the side wall assembly on a positioning pin of the built-in clamp, and adjusting the pressure control valve to ensure that the variation of the distance between the supported positioning pin of the side wall assembly and a theoretical value is within +/-0.1 mm under a load state.

Claims

1. A method for improving the positioning strength of a built-in clamp is characterized by comprising the following steps:

step three, installing a first supporting unit and a second supporting unit on site, measuring X, Y, Z data of a first contour block (1) in the first supporting unit and a second contour block (9) in the second supporting unit in a three-coordinate mode, and adjusting the first supporting unit and the second supporting unit to theoretical positions;