The central control buttons and knobs are commonly used human-machine interfaces in cars, in addition to the steering wheel, foot pedals, and brakes. Pressing the one key start button on the car, knobs or buttons for air conditioning, knob volume adjustment, audio and video conversion, button switching of central control display content, etc. In order to provide users with a good operating experience, automobile manufacturers strictly require the operating force, rotation torque, and operating feel of knobs and buttons. And it will require its supporting suppliers to comply with the requirements.Lianxiang Equipment has developed aCentral control button load knob torque testing machineThe comprehensive testing has high efficiency and relatively low cost. Can comprehensively test the load stroke feel of the central control buttons, as well as the torque angle of the knobs and the analysis data of each checkpoint.

Testing the buttons on this device is generally not difficult, but when it comes to testing torque, the following points still need to be noted

difficulty1: The torque is relatively small,

Usually onlyAround 20-40mNm, the peak torque of a typical 30mm diameter knob is only 22mN. m, with a product design standard of ± 25%. The equipment must have a certain degree of repeatability to reliably test the torque of the knob.

The testing system requires very small torque sensors, and they are dynamic torque sensors; The accuracy of the testing and acquisition system must be sufficient, and the structural design should also avoid generating additional torque, such as avoiding the use of sensor measurement end bearings.

High coaxiality requirements

Knob testing requires high coaxiality of the system, and coaxiality errors can cause the test data to deviate from the center point. It appears that the data has been tested, but there is a serious deviation from the true value.

The torque waveform of the test fluctuates up and down at the same angle during the outbound and outbound strokes, which is a typical concentricity deviation test waveform data. In our testing system, after adjusting the concentricity, the following waveform can be tested

Adjust the concentricityTest data after OKshould beOverall smooth and symmetrical:

Testing efficiency;

1) Some laboratories in the automotive industry have imported knob torque testing equipment, which has good testing results, but the testing speed is relatively low, generally only 10-30 °/s. It takes more than 20-30 seconds to fully test a knob, and it can only be used for laboratory research. It cannot automatically clamp the product. Each test requires manual adjustment of the XY table to adjust the center, and manual adjustment of the clamping knob, which takes a long time to test;

2) Some automobile parts manufacturers, such as Weishitong, have independently developed testing systems for 6-axis robots. The testing knob can only achieve 3 °/s, and testing one knob takes 240 seconds, which is useful for experimental research. It is obviously impossible to keep up with the pace to achieve full inspection in the workshop;

3) Some automation manufacturers also claim to have developed rotary knob testing equipment, but have not seen actual usage effects or complete test waveform data, and specific data is unknown. Without a waveform chart, the accuracy of the data cannot be verified.

Obviously, the above methods are not suitable for the rhythm requirements of automated production lines, and the testing efficiency is insufficient.

Comprehensive cost and applicability

The unit price of imported fully automatic equipment of this type exceeds200W， Each imported instrument for testing knobs and buttons separately exceeds 20W (not applicable to production lines),

Based on the above research, we have developed a button torque integrated testing machine that can test both buttons and knobs, and can adapt to different specifications of products. The testing efficiency is high, the data stability is good, the cost is moderate, and the flexibility is good. It can be used to test different specifications and models of automotive buttons and knobs on automated production lines

This device can also customize the collection of central control screen voltage according to customer requirements, as well asCAN/LIN signal acquisition.

toCentral control button load knob torque testing machineIf you have any technical questions, you can contact Suzhou Lianxiang Testing Equipment Co., Ltd. Wei Jia