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The hole diameter of some drill stencils is below φ3.5, it can't be cut with boring tool, only the hinge can be drilled out, and the positioning reference is small. Such drilling hole is not only difficult to process, but also the positional accuracy is extremely difficult to control.
Processing of incomplete holes
Some of the holes in the drill template are not complete holes. The lack of meat is so that the knife can't guarantee the positional tolerance of the hole. It is also out of tolerance after the drill sleeve is set.
Processing analysis of extra long holes
Due to the structure of the super-long hole, the clamping positioning reference can only select φ6g6 positioning axis, the clamping position is unstable, the rotation is easy to occur, and the φ2 hole position of the part is out of machining error; and when the left end of the part is processed The benchmark must be converted to the left end. Since the φ2 hole of the part can only be drilled and boring, there are many factors that cause machining deviation: such as the easy rotation of the part, the cumulative error caused by the reference conversion, the positional deviation of the exit caused by the drill reaming phenomenon. If it is necessary to ensure the processing is qualified, it is necessary to position the clamping, the reference is stable and reliable, and no rotation is generated, so that the outlet of the hole to be processed is first processed, that is, the outlet is upward.
Processing analysis of incomplete holes
According to the drawings, since the exit of the required position of the part is an oblique face, and φ5H7 is larger than 4mm, it can be cut with a boring tool. However, when the hole is incomplete, the tool is half-stressed and the other half is not struggling. It is proved that after the hole is processed, the center of the incomplete hole is obviously shifted to the incomplete direction, resulting in the actual size of the hole center being greater than 36.9±0.02. If the size is specifically reduced, the angle of 30° is exceeded when the tolerance is 36.9±0.02. . In order to ensure the processing is qualified, it is necessary to find ways to make the incomplete holes tend to be complete, so that the machining process does not cause the phenomenon of the knife that is caused by the incompleteness of the holes, and the resulting difference is excessive.
Processing solutions for extra long holes
a) According to the processing analysis, in order to make the positioning reference of the part stable and reliable, only the process positioning reference is added before the processing, and the process reference is removed after the processing is qualified. If the drawing is improved, the left end of the dotted line is the machining reference and the clamping positioning part, and the benchmarks B and C are arranged reasonably, so that the process reference is consistent with the part reference.
b) In order to make the distance between the cylinder and the pyramid ridge line to the positioning reference surface 20mm, it is necessary to detect the process on the optical instrument to ensure that the error of 20mm is within 0.005, and that φ18±0.02 is 97°20′24′′. The point on the cone surface to the reference B distance is calculated and processed accurately.
c) In the process, firstly clamp the part on the rotating center of the universal turntable workbench, and then install the craft ball at any position on the worktable so that it is in the vertical plane of the x-axis of the trampoline; The height of the center, the distance from the center of the part, and the distance from the intersection of the cylinder and the cone ridge line detected by the process to the positioning reference plane; the height of the universal turntable ensures that the center of the machined hole is parallel to the center of the boring machine spindle.
Then, according to the above data, the distance from the process ball to the hole to be processed is calculated, and after the process ball is found, the process is processed until the pass is passed. According to the process requirements, the process benchmark needs to be after the quenching process, and the qualified party can use the wire cutting to remove the process reference part to avoid premature removal of the process reference and cause undetectable or inaccurate detection.
Processing solutions for incomplete holes
If the process part is increased, the incomplete hole is completed and then processed, but the problem that comes with it is that the parts of the process are deformed. If a pad of the same material as the part is used, the pad is machined under the part and works well. After processing, the conclusion is: when implementing the process of processing similar parts, the process mat should be designed with the same material as the part, and the same hardness can be obtained by quenching at the same time, so that the material and hardness are not generated during the boring processing. The difference is again generated to make the knife and the difference.
summary
No matter the structure is different, or the processing and clamping methods are different, as long as the machining rules of the parts and the boring are found, the holes to be machined must be perpendicular to the rotating main axis of the boring machine, and then the necessary processing method is selected according to the characteristics of the parts to be machined. To ensure technical conditions and use requirements.