Tapping parts in the mechanical transformation industry, they sometimes meet unreasonable processes (welding the part with threaded holes, then the treatment of the final side of the threaded hole), the treatment staff fail to Read the drawing (bad size) or operating errors, or the treatment of operating errors of the processing staff (calculation errors, shallow background holes, programming errors and errors of depth of threading hole) and D ‘Other factors lead to a depth of the depth of the depth after treatment.
Once such problems occur, due to the poor stability of the drilling machine, operators and process technicians often install the part directly to be repaired on the bore machine or the work of the machine to die . According to the following method. However, this method can easily lead to the “friction cut” of the original wire operator during the bottom hole drilling process, resulting in damage to existing wires and affecting the quality of treatment of thread holes.
At the same time, this method of repair requires that the operator have a good technical level, and the calibration process of the threaded holes is long and the work efficiency is very low. The cost of repair with boring and milling equipment is also relatively high. In addition, if the final side of the threaded hole is not perpendicular to the midline of the threaded hole for welding or other reasons, it will inevitably lead to damage to the existing wire during the secondary drill of the bottom hole. This will inevitably lead to the potential risk of deleting or downgrading threaded holes from the room. After many discussions and experiences, the author has found a series of advice with relatively rapid know-how and reliable and stable quality.
1. Methods to repair shallow threaded holes on a rocking drilling machine
If the room has a high hardness, you can pierce and attack on the rocker drilling machine when repairing its threaded holes. However, the midline of the threaded hole must be corrected in the manner illustrated in Figure 1 and the midline of the main tree of the drilling machine, then use the drill bit directly to correct the central line of the threaded hole and From the drilling machine the borehole is coaxial, and use the forest and type to follow the required size exercise and attack the threaded holes with shallow depths.
Steps to repair the threaded holes: first, place the part on the adjustable screws that have been arranged on the work of the drilling machine; The line of the threaded hole is consistent; Then close the spindle from the boring machine to the calibration screw (a space should be left to prevent the boring machine from tightening the calibration screw and affecting the calibration accuracy) and Adjustable the adjustable screw so that the calibration screw is parallel to the borehole machine, gradually adjusted and leaning to ensure that the parallelism error is not greater than 0.03 mm. Screw to make it also subject to force; The handle and the threaded hole are uniform, pierce depending on the size required and complete the drilling simply replace the tap screw after the hole.
The production of a modified forest is very simple. The part of the right rod is uniformly crushed or removed by 1 mm, so that there is a space of 1 mm between it and the original threaded hole in the drilling hole, and no damage to the threaded hole is will produce.
The precision requirements for the calibration screw are high.
2. Shallow thread repair methods with hand drill
When the parts with a larger volume, heavier and softer mass materials (such as aluminum alloy parts) must be fixed with a small diameter and a small thickness, you can use handstone to tighten the Modified drill to drill them directly, then type, then type the wire manually (see Figure 2).
3. Conclusion
The method of repairing small net holes is very innovative, in particular the use of forest trucks and modified forests after grinding. . In the real production process, the problem of repairing shallow threaded holes can be resolved effectively.
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