Crossing holes are a problem for many factories, this is what we often call the problem of transverse holes. Friends engaged in treatment know that when the forest participates in the borehole, both sides need support. If the support is not enough, then the treatment. Problems can arise, this situation can occur when we treat transverse holes. We will talk about this problem in detail later. As for the parts with transverse holes, many parts have the function of letting the water pass, such as the water cooling holes. The mold and the oil passage holes of the crankshaft a role.
Whether it is parts or drills, they will encounter various problems during treatment. If the treatment is interrupted during the cut, such as the impossibility of continuously participating in the cut during drilling, this can have an impact on the edge of the edge during the passage. The hole, can also be accompanied by vibrations, which will also have an impact on the edge.
The way to eliminate shavings can be a problem that must be faced during the machining of deep holes. The shavings can be blocked in the shavings groove, damaging the finish of the hole and the cutting edge of the tool if the chips are “pushed”. The front of the edge, they can cause secondary damage to participate in the Cup, which also has catastrophic damage over the life of the tool.
Transversal holes can suffer from burrs of burrs and the resulting vibrations can cause deflection and make it more difficult to obtain high quality holes.
In fact, the drilling, filming and milling are completely different, in particular the treatment of deep holes, such as holes whose diameter exceeds 10 times, often when we judge the state of treatment, we must judge to cutting state depending on the cutting state. shape or noise of drilling shavings. If the equipment does not work. With certain auxiliary surveillance systems (such as Arits in the United States), inexperienced friends can undergo multiple knife breakage accidents, which seems to be experienced by everyone.
Depending on the design of the forest and the manufacturer, certain aspects are similar during the machining of transverse holes.
1. slow down.
2. Use internal high pressure cooling to remove the shavings.
3. If the diameter of the hole is larger, try choosing a shorter forest, which will have better rigidity.
4. Get involved with your suppliers to discuss and improve the design of tools.
1
Reduce parameters
Whatever type of forest you use, carbide forest, indexable drill, crown drill, we usually recommend slowing down the advance. When the forest passes through the hole, it is recommended to reduce it by 25 to 75 %, to start drilling at full speed in advance, to reduce the speed in advance at the approach, to the entrance and to The exit of the transverse hole, then return to full speed in advance. Technicians must also take certain specific situations into account and optimize the program to adapt to the machining of transversal holes. However, when only one hole must be treated, the challenge can be less. A simple reduction in line speed can adapt to this. operating state.
If you enter the cross-opening treatment, due to the curved surface, the treatment parameters may have to be refined according to the real situation, and the adjustment depends largely on the quality of the holes of which you have need. Through the holes, or you may need an opening with a very precise position. As the opening quality requirements are increasing, parameter adjustments may require several adjustments to obtain an ideal effect.
As a rule, it is recommended to reduce the speed by 50 %, but it depends on the conditions. If you do it on a midline of transverse hole by entering a relatively flat surface, you will fall a little less if you enter a curved surface. , and the two holes are shifted. There is a curvature problem here and you may have to slow down.
Drilling angles of 45 ° or 30 ° can pose a greater problem than 90 °. If you enter at 30 °, you have a longer forest that tries to machitate without too much support, you must therefore extend the forest support. Reduce advance and speed. If you pierce with a cannon drill, retract the tool at a slower speed so that the tool is shaking much less.
Of course, there are certain situations in which speed reduction is not appropriate. If the tool is progressing too slowly and a friction occurs, such as stainless steel, heat-resistant combination of allied tends to harden, you will therefore may have to think of others. means to solve this problem.
2
Chips
A good cooling liquid is also crucial for the evacuation of chips during the machining of transverse holes. In the machining of deep holes, the coolant needs a correct pressure and sufficient flow to flow towards the cutting edge through the internal cooling hole in order to cool it completely. If certain equipment does not have basic conditions, these basic tasks may have to be processed before treatment. , otherwise it will add a lot of resistance to your deep holes treatment.
If a smaller hole passes through a larger hole, there will be a space and the shavings will fall along the chip groove. In this case, sufficient cooling pressure is necessary to clean the shavings. Sufficient pressure should be maintained throughout the process to improve the quality of the hole treatment.
3
Use shorter tools
When you face different hole diameters, try choosing a larger hole diameter to treat less constraints on the tip of the forest. When you cross a large hole, the curvature of the hole will be greater, so that the tip of the forest can touch the most distant side, and we all want the chisel ed of the forest first touches the room rather than the side . As far as possible, use a shorter forest to finish machining because it is the most rigid and minimizes vibrations.
4
Non -standard customization
The material processed, hole size specifications and the final properties of the final product will determine the type of drill and whether to consider using non -standard forests. For example, you can add guidance bars to the cannon drill to reduce vibrations. Or choose a harder quality alloy material or better coating improves the life of the tool.
Daguang focuses on providing solutions such as precision CNC machining services (3-axis, 4-axis, 5-axis machining), CNC milling, 3D printing and rapid prototyping services.
