“Design and manufacture a wireless transceiver that performs mixed transmission of digital-analog signals on the same channel. Among them, the digital signal is composed of a set of 4 numbers from 0 to 9; the analog signal is a voice signal with a frequency range of 100 Hz to 5 kHz. Using wireless transmission, the carrier frequency range is 20~30MHz, the channel bandwidth is not more than 2...
When determining the positioning datum of the part, it can be processed according to the following requirements:
1. For stainless steel parts processing, try to choose the design datum on the part as the positioning datum. When formulating a part’s processing plan, first select the best precision benchmark for machining center processing. This requires that during rough machining, consider what rough datum to use to machine each surface of the fine datum, that is, each positioning datum used on the machining center should be processed in the previous ordinary machine tool or machining center process, so that it is easy to ensure that each work The precision relationship between the machining surfaces, and when some surfaces need to be completed by multiple clamping or other machine tools, choosing the same datum positioning as the design datum can not only avoid the positioning error caused by the datum misalignment , To ensure the processing accuracy, and can simplify the programming.
2. When stainless steel parts processing cannot be completed at the same time on the machining center, including the design datum, the positioning datum should be as close as possible to the design datum. At the same time, it must be considered that after positioning with this reference, all key precision parts can be processed in one clamping. In order to prevent the finished parts from undergoing multiple non-important size processing and multiple turnovers, resulting in deformation of the parts, bumps and scratches, consider completing as many processing contents as possible at one time (such as screw holes, free holes, chamfers, etc.) In addition to non-important surfaces, tool inspections, etc.), the processes completed on the machining center are generally arranged at the end.
3. When processing stainless steel parts on the machining center, when both the processing datum and the processing of each station are completed, the selection of the positioning datum needs to consider the completion of as much processing content as possible. For this reason, it is necessary to consider a positioning method that facilitates all surfaces to be processed. For example, for a box, it is best to use a positioning method of two pins on one side to facilitate the processing of other surfaces by the tool.