Investigation of the direction of the bolt hole of the deceleration frame
Although the position of the bolt holes may be qualified in the quadrilateral ABcd range, for a specific value of a, the points in the quadrilateral ABcd range may be unacceptable. For example, if the angle of a certain point is a, and the position of the bolt hole is m point, the position of the bolt hole is unqualified because the actual size P1 exceeds the tolerance range TFZ of the angle corresponding to the angle a.
Therefore, when detecting the position of the bolt hole, the coordinate size and angle value must be considered at the same time. For the finished casing, two methods are used in the production measurement, and the measurement results are calculated and verified. The production process is controlled based on the verification results.
During the measurement, the in-plane is adjusted on the platform so that the two step thread measuring axes (which can be replaced by the thread coaxial gauge) are screwed into the two bolt holes perpendicular to the platform, and will be traversed on the two claws of the housing. The rod is leveled. 7 hearts through the mouth. 5 can indirectly measure the a value.
The shell A is leveled downwards, and the b value is indirectly measured by using two stepped thread axes and a bar traversing the two jaws of the housing. The actual angle can be measured by the angle ruler. The actual values ​​Fl and Hl can be calculated from a, b, and the value: the diameter of the step shaft of the deceleration top and the speed-measuring one-step thread measuring shaft; the diameter of the measuring rod.
The angle a value, P value and Hl value can be directly judged by the following formula: a town a, town a + â–³ a (3) household town F cluster + T) where: â–³ a angle a value tolerance; The tolerance of a dimension F; the tolerance of the hole I to a dimension H. The method is cumbersome in operation, has many operation steps, has many measurement factors, large accumulation error, poor reliability of measurement results, long measurement time, and requires a high technical level of the operator. But it requires less, mostly general-purpose tools, suitable for single-piece, small-volume production.
The measuring method of the measuring tool is carried out using the measuring tool 1 and the measuring tool 2. The design of the measuring tool utilizes the large end face of the housing and two bolt holes and their end faces to mount the measuring tool, which makes the measurement convenient and makes the measurement result stable and reliable. However, since the measurement direction does not match the direction given by the measured element, the measured value needs to be converted. The angle a value and the L size can be measured by the test tool one (composed of the ball threaded rod and the base).
The HI size can be measured from the test tool 2 (consisting of the mandrel and the measuring plate). The angles measured by the measuring tool 1 and the measuring tool 2, the value of the value of H, the value of the value of the value of the value of the value of the value of the value of the coordinate value are not the values ​​of the given coordinate size, and must be converted to the actual value of the direction of the given coordinate size. =Ztga ten (L-IJo one is not) /Cosa B, must c, gas g inch å…€ä¸å¤•gu (7) hall = Fs:na+ million Ze, osa (8) in the formula: must c one test one The diameter of the ball head of the ball threaded rod; the diameter of the large end of the tapered portion of the mandrel of the test piece; the distance from the center of the large end face of the casing to the end face of the bolt hole, which is the middle of the formula derivation calculation Dimensions; the distance from the bottom surface of the base of the test tool to the mounting end surface of the housing; g the distance from the outer end of the ball head of the test tool to the end face of the bolt hole of the housing; e.
The converted H1 value and P value and the measured angle a) value must still be judged by the qualification formula. The method is simple in operation, less in operation, less in measuring factors, small in accumulation error, reliable in measurement results, good in reproducibility, short in measurement time, and does not require high-level personnel. This method is suitable for mass production.
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