Small small-sized bearing ring detection tools

To ensure the normal conduct of each process bearing production and product quality requirements, bearing quality inspection is very important, it is to ensure that the bearing products meet various grade standard means. Bearing parts size accuracy and geometric accuracy and shape tolerance and surface quality often use to detect bearing instrument. From the point of bearing manufacturing process, a set of bearing inner and outer circle machining need dozens of working procedure, dozens of inspection instrument, check for hundreds of times. Bearing in the production of the inspectors general accounts for 10% ~ 16% of production workers, and only by inspectors check to assess the quality of the bearing parts, visible bearing inspection in the important position in the bearing industry. Figure 21 bearing test of rolling bearing belongs to the basis of precision machinery product, requires interchangeability. In order to ensure its accuracy, in addition to rely on the work of art and the correct reasonable mechanical processing method, also must have a strict quality inspection. In order to make the inspection techniques adapted to the bearing industry specialization of production, batch need to mass production characteristics, widely used in the bearing special measuring tool. But sometimes according to need, such as precision bearing also use common measuring tool inspection. 2. 1. 1 vernier caliper as shown in figure 2. 1, when using simple scribed line measuring tool ( Such as scale) Requires accurate when measured to 1/10 scale is quite difficult, mainly because of the limit of the resolving power of the eye. To increase the accuracy of reading, can make use of mechanical breakdown of solution. The principle of the vernier caliper is actually a cursor scribed line segmentation principle, usually in the measurement accuracy requirements is not high production workshop USES, such as in bearing production, forgings, heat-treated pieces and outsourcing of cage, Turner inspection use vernier card feet, directly measured the inner and outer diameter of the work pieces, such as the width of the feet す vernier caliper reading method is as follows: principle is to use vernier reading ruler body line spacing and cursor engraved line spacing is poor. Vernier caliper according to its scale value points have 0. 1毫米,0。 02 mm and 0. 05 mm three, the three feet of vernier caliper scribed line spacing is the same that every case is 1 mm. The difference is the calibration interval on the cursor with the ruler of the calibration interval difference is different, so they have different readings. Now we often use a ( 0. 02mm) The paper are as follows: 0. 02 mm vernier caliper ruler body every little is 1 mm, when two claws merger, feet on the 49 mm just to align the cursor, 50 per the cursor = ( 49÷58 mm＝. 8 m, feet body differ with vernier per division = ( 1 - 0. 98). mm＝0. 02 mm, when the cursor is used to measure the talk, shall, first of all, according to the zero line cursor location read integer part of the rod body scale.