Dent resistance tester for automotive body panels

Abstract

The invention discloses an automotive body covering part concavity resistance tester which comprises a loading unit and a control unit. The loading unit comprises a base, wherein the base is connected with a robot arm and provided with an open groove which penetrates through the upper surface of the base and the lower surface of the base; a pair of ball bearing pedestals is fixed to the two sides of the open groove and arranged on the lower surface of the base, wherein a ball screw is fixed on the ball bearing pedestals through a bearing and can rotate relative to the bearing; the end, extending out of the ball bearing pedestals, of the ball screw is connected with a drive motor through a coupler; a pair of slide rail brackets is fixed to the two sides of the open groove and arranged on the upper surface of the base, wherein a slide rail is arranged in the slide rail brackets and used for a dowel bar to penetrate through; one end of the dowel bar is connected with a force sensor and a test head, and the force sensor is used for measuring pressure borne by the test head; the other end of the dowel bar is connected with a displacement sensor which is used for measuring the displacement of the dowel bar; a force transmission arm penetrates through the open groove, wherein the lower portion of the force transmission arm penetrates through the ball screw through a screw nut, and the upper portion of the force transmission arm is fixedly connected with the dowel bar.

Description

technical field [0001] The invention relates to the field of automobile testing, in particular to a dent resistance tester for automobile body coverings. Background technique [0002] With the development of the automobile industry, automobile manufacturers not only pay attention to the safety and comfort of automobiles, but also in order to save energy consumption, meet strict emission standards, and protect the environment, they have to use thinner steel plates as the outer covering parts of automobiles. This leads to a series of problems caused by the "softening" of the outer cover, such as the sag caused by the weight of the outer cover or a slight collision, the vibration and noise generated during the driving of the car, and so on. In response to these situations, automobile manufacturers have raised the issue of the dent resistance of the outer covering, and customers also require the dent resistance of the body as a main indicator when purchasing a car. The so-calle...

AI Technical Summary

Problems solved by technology

[0007] 1. The existing scheme adopts a frame structure, which is limited by the size of the frame. After completing the measurement of one part (such as a car door), it is necessary to move and fix the whole frame when measuring the next part (such as a tailgate), which is not flexible;

[0008] 2. The position adjustment device of the test head in the existing scheme is locked by bolts. Every time the position of the test head is adjusted, several bolts need to be loosened, and these bolts need to be tightened after the adjustment is completed. This adjustment method is time-consuming and laborious, and the efficiency is low.

[0009] 3. Due to the limitation of structure and size, the existing scheme cannot measure the sheet metal surface of the horizontal parts of the vehicle, such as the rear of the hood, the roof and the trunk. For details, see image 3 The shaded area in :

[0010] 4. The displacement sensor and the force sensor of the existing scheme are not rigidly connected in series, but are connected by a flexible cable. When the axes of the force sensor and the displacement sensor do not coincide, the measurement results will be wrong.

[0011] 5. The existing scheme does not mention the type of actuator (hydraulic, electric) and control method (wired, wireless), but judging from the shape of the actuator, it uses a hydraulic cylinder type actuator and a wired control method , its control method is more complex and difficult to master

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