Tool selection can not be ignored a few
The importance of tool selection in machining is self-evident, learn to choose tools to help you work up handy, so the tool selection of 15 military regulations you have to be valued!
1, the most important tool is processing.
Any stoppage of a tool means a halt in production. But that does not mean that every tool has the same important position. Cutting the longest cutting tool on the production cycle of greater impact, so the same premise, should give more attention to this tool. In addition, you should pay attention to the processing of critical components and machining tolerances the most demanding tool. In addition, the relatively poor control of the chip cutter, such as the drill, grooving knives, thread cutting tools should also focus. Because of poor chip control can cause downtime.
2, match with machine tool
The tool is divided into the right hand knife and the left hand knife, so it is very important to choose the correct tool. Normally right hand tools are suitable for CCW machine tools (viewed in the direction of the main axis); left hand tools are suitable for CW machines. If you have a few lathes, some hold the left hand tool, and the other right hand and left hand are compatible then select the left hand tool. For milling, people tend to prefer more versatile tools. However, even though such tools cover a wider range of machining, you also lose the rigidity of the tool instantly, increase the tool deflection, reduce the cutting parameters, and more easily lead to processing vibration. In addition, the machine tool change tool manipulator size and weight of the tool is also limited. If you purchased a machine with a through-hole cooling through-hole in the spindle, also choose a tool with a through-cooling through-hole.
3, and be processed materials match.
Carbon steel is the most commonly processed material in machining, so most tools are based on optimized carbon steel design. Blade grades need to be processed materials to choose from. Tool manufacturers offer a range of tool inserts and matching inserts for the machining of non-ferrous materials such as superalloys, titanium alloys, aluminum, composites, plastics and pure metals. When you need to process the above materials, please choose the tool that matches the material. Most brands have a variety of tools, indicating what material is suitable for processing. Such as DaElement 3PP series is mainly used to process aluminum, 86P series specifically to the processing of stainless steel, 6P series specifically to the processing of high-hard steel.
4, tool specifications.
Common mistakes are the specifications of the selected tool is too small, too large milling cutter specifications. Larger specifications of the turning rigidity is better; while the large milling cutter not only higher prices, and cutting time longer. Overall, the large size of the tool price is higher than the small size tool.
5, choose to change blade type or re-sharpening tool.
The principle is simple: try to avoid sharpening the tool. In addition to a small number of drill and face milling cutter, the conditions permit, try to choose a tool for blade or tool changeable. This will save you labor costs, while achieving a stable processing effect.
6, cutting tool materials and grades.
Tool material and grade selection and the material being processed performance, machine speed and feed rate are closely related. Choosing a more versatile tool grade for the material group to be machined usually selects the coated alloy grade. Refer to the "Grade Application Recommendation Chart" provided by the tool supplier. In practice, the common mistake is to try to solve the tool life problem by replacing similar material grades of other tool manufacturers. If your existing tool is not ideal, then the re-election of other manufacturers close to the brand is likely to lead to similar results. To solve the problem, we must know the cause of tool failure.
7, power requirements.
The guiding principle is to make the best use of it. If you purchased a milling machine with a power of 20hp, then select the appropriate tool and machining parameters, allowing the workpiece and the fixture to allow 80% of the machine power to be used. Special attention must be paid to the power / tachometer in the user's manual for the machine tool, which selects the tool for better cutting application depending on the effective power range of the machine's power.
8, cutting edge number.
The principle is that the more the better. Buying a turning tool with twice the cutting edge does not mean paying twice as much. In the past decade, the advanced design has also doubled the number of cutting edges for grooving knives, cutting knives and some milling inserts. It is not uncommon to replace the original cutter with only four cutting edges with an advanced cutter with 16 cutting edges. Increasing the number of effective cutting edges also directly affects the table feed and productivity.
9, choose the overall tool or modular tool.
Small size tool is more suitable for the overall design; large format tool is more suitable for modular design. For larger tools, users often want to reclaim new tools by simply replacing smaller, less expensive parts when the tool fails. This is especially true for slotters and boring tools.
10, choose a single tool or multi-purpose tool.
The smaller the piece, the more often the compound cutter is used. For example, a multi-purpose tool can be combined drilling, turning, hole machining, threading and chamfering. Of course, the more complex the workpiece is also more suitable for multi-purpose tool. The machine only benefits you when it comes to cutting, not when it comes to downtime.
11, choose the standard tool or non-standard special tool.
With the popularization of CNC machining centers (CNC), it is generally believed that the shape of the workpiece can be realized through programming instead of the tool, therefore, non-standard special tools are no longer needed. In fact, non-standard tools today still account for 15% of total tool sales. why? The use of special tools to meet the precision requirements of the workpiece size, reduce processes and shorten the processing cycle. For high-volume production, non-standard special tools can shorten the processing cycle and reduce costs.
12, chip control.
Keep in mind that your goal is to machine the work piece rather than the chip, but the chip clearly reflects the cutting condition of the tool. In general, people are prejudiced about the existence of swarf because most people do not receive training in interpreting swarf. Keep in mind the following principles: Good chips do not destroy the process, poor chips are the opposite.
The inserts are designed with chip breakers, which are designed for feed rates, both for light or heavy cutting.
The smaller the chip, the harder it is to break. Chip control is a big challenge for difficult-to-machine materials. Although you can not change the material being machined, you can update the tool, adjust the cutting speed, feed rate, depth of cut, nose radius and so on. Optimize the chip, optimize the processing is a comprehensive choice of the results.
The face of tools, parts and CNC machining machine tools, tools often need to define the path. Ideally, learn about basic machine code and advanced CAM software packages. Tool path, must take into account the tool features, such as slope milling angle, direction of rotation, feed, cutting speed and so on. Each tool has a corresponding programming technology to shorten the processing cycle, improve chip, reduce cutting force. Good CAM software package saves labor and increases productivity.
14, choose innovative tools or conventional mature tools.
With the current rate of advanced technology, the productivity of cutting tools can double every 10 years. Comparing the recommended tool-cutting parameters 10 years ago, you find that today's tools double the machining efficiency and reduce the cutting power by 30%. New tool alloy matrix stronger, more toughness, higher cutting speed, lower cutting force. Chip breakers and grades are less specific and versatile. At the same time, modern tools also add versatility and modularity, both of which together reduce inventory and broaden tooling. Tool development has also led to new product design and machining concepts such as king knives with turning and grooving capabilities, large feed milling tools, high-speed machining, micro-lubrication cooling (MQL) and hard-car technology. Based on the above factors and other reasons, you also need to follow up the most preferred processing methods, learn the latest advanced tool technology, otherwise there will be a backward risk.
15, the price.
Tool prices are important, but not as important as the cost of production due to the importance of cutting tools. While knives have their price, the real value of knives lies in their duties for productivity. Often, the lowest cost tool is the one that causes the highest production costs. Cutting tools cost only 3% of the cost of the part. So pay attention to tool productivity, not its purchase price.
From: non-standard tool network