When the performance of the boring process is degraded, the cause may be caused by a specific factor or a combination of factors. These factors include workpiece stability, machining allowance, tool system rigidity, insert grade and geometry, cutting speed and feed rate match tool performance. These factors should be analyzed and screened when the processing cycle is too long, the tool life is shortened, or the part quality is deteriorated. In a particular pupillary process, the effects of one factor may be more pronounced than others, but these factors may also be closely related to each other. Changing one of these factors may mean that in order to achieve the desired result, another factor must be changed at the same time. However, do not change two or more factors at a time when performing a cutting test.
Workpiece stability
Although machining centers and fixtures are usually not the first considerations in the shop, if the state of the workpiece is unstable during machining, the machine and fixture may seriously affect the cutting performance of the tool.
If the clamping rigidity of the workpiece is guaranteed, the size and power of the machine will also affect the cutting parameters. Although the same rough boring head can be used for machine tools with spindle taper holes for CAT50, CAT40 and BT30, not every machine can perform the same boring process. The same is true for pupil depth. On the CAT50 machine, the hole with a hole diameter of 75 mm and a hole depth of 250-300 mm can be boring. The CAT40 machine can also complete the size range with the extended mast, but any machine with less than 40 taper does not support this type of machining.
Abraded machine spindles and unstable fixtures are often factors that cannot be changed but must be addressed. Sometimes these factors can completely defeat a machining task, but in general, changing the blade type or cutting parameters will provide a solution.
Machining allowance
It is often unclear for the processing personnel to reserve a margin for the boring process. The user may be more familiar with the cutting speed/feed rate of the turning and the required machining allowance, but these experiences are not always suitable for boring. This is especially the case in rough machining with a file. It is not uncommon for the diameter of the drill to be very close to the final hole diameter of the workpiece (only the 0.5-0.75mm boring allowance is left). The small amount of material is not enough for the blade of the two blades. This will result in chattering and tool cutting performance degradation. If there is not enough machining allowance and loose diameter tolerance (one tenth of a tenth of a centimeter), it is better to use a trowel (or a boring tool that removes one of the blade chucks).
On the other hand, for a part with a core hole, if the core hole is not positioned correctly, there may be too much workpiece material to be cut. Even if the core hole diameter is within the typical rough margin standard, the eccentricity may cause the blade to have a larger amount of knife on one side of the hole than the blade can withstand the chip load.
Assembly rigidity of the tool
When selecting a file for a machining task, it is usually based on the required pupil diameter and nominal depth, with little regard to the actual pupil depth and the required extra overhang (if needed). For example, in some boring operations, the boring depth is only 50 mm, but the tool may need 200 mm of overhang by reaching the boring through the workpiece and/or the clamp. This is in contrast to the required boring process with a bore depth of 250 mm.
To maximize tool rigidity and range of use, the modular boring system offers an unlimited number of modular combinations. In the case of longer tool lengths, it is important to first select a larger mast base diameter and then reduce the mast diameter as needed, rather than using the same diameter dimension throughout the mast length.
For long overhang boring with limited space, consider a solid carbide mast (instead of multiple extension rods). This configuration provides greater rigidity and better control, but is generally limited to smaller diameter boring.
For long overhang boring, a modular boring system with a larger overhang connection size and a tool diameter reduction if necessary is more than a tool configuration that only considers the nominal boring length and bore diameter. Good rigidity.
Blade grades and geometry
The blade is the key point of contact between the workpiece and the tool. If the insert does not match the boring process, even if the boring system is extremely rigid and the boring head is precisely balanced, it may be difficult to obtain the desired workability.
If the blade geometry does not guarantee the stability of the cutting, the best blade grades will not help. Pressing geometry of the boring insert usually uses a relatively conservative chipbreaker to maintain a long service life under stable machining conditions, but its radial depth of cut should be at least 1/2 of the radius of the tool nose. In some demanding boring operations (such as deep hole or long overhang boring, long chip material boring, or machine and / or fixtures cause workpiece holding instability), the geometry of the é•— blade can be more Cut freely.
For specific boring operations, the blade grades and coatings used are constantly being upgraded. When boring steel workpieces, the most commonly used cermet and three-layer coated carbide grades. Coated carbide grades can also be used for boring of cast iron. If the processing conditions are stable, silicon nitride ceramic inserts and certain cubic boron nitride (CBN) grades can also be used for cast iron boring. Aluminum and other non-ferrous materials can be boring with uncoated carbide inserts, which typically have large positive-angle ground chip breakers to prevent the formation of long strips. For high-speed precision machining of these materials, inserts with polycrystalline diamond (PCD) tips or coatings may also be a good choice. It must be remembered that cutting stability is the first requirement for extending blade life.
Cutting speed and feed rate
After considering all other factors, it is also necessary to determine whether the cutting speed and feed rate are appropriate. These cutting parameters are critical to achieving the best free cutting conditions. The ideal boring condition is to use a high cutting speed and a moderate feed rate, but this may also be limited by the above various conditions.
A common mistake in rough machining with a file is to simply multiply the feed rate for a single point boring by two. This calculation method is usually not correct: for boring of the same hole diameter, the feed rate of the rough boring tool can be up to 4 times that of the fine boring tool, because the rough boring tool can adopt a larger tool nose arc radius. For example, if the sharp burr has a nose radius of 0.2 mm or 0.4 mm, the rough blade can have a nose radius of 0.8 mm. The tool nose radius is doubled, and with two blades, the feed rate is four times that of the fine boring tool.
In general, rough machining does not require a very fine surface finish, so a more rigid boring tool can be used to process at higher cutting speeds. If the feed rate of the file is too small, it will cause chatter due to improper machining allowance. Rough boring tools are used for boring of larger loads, requiring more workpiece material to be cut and a higher feed rate.
It is sometimes difficult for the processor to determine the appropriate surface cutting speed for fine machining. Optimizing cutting speed is critical to extending blade life. If heavy-duty boring is performed at a very high cutting speed, a large amount of cutting heat will be generated and the blade life will be shortened. Reducing the chip load reduces the cutting temperature, allowing the boring insert to be machined at higher surface feed rates.
Concerned about surprises
Label: Boring processing performance
Previous: Pressure sensor injection mold application case Next: What are the principles and characteristics of pneumatic measuring instrument?
We diviided the led light according to the using eviiroment. Most of our product is the commercial LED Lighting
Commercial lighting is a term used to describe lighting that is used in commercial spaces, including auto dealerships, distribution centers, churches, factories, offices, and warehouses. Unlike residential lighting, commercial lighting is made to withstand more abuse and has a longer lifespan.
While the focus of residential lighting is often on aesthetics, commercial lighting is task orientated. Commercial lighting systems are designed based on what the application is. For example, in an office-type setting, you may see task lighting, which illuminates specific areas where employees need concentrated light to be able to perform their jobs.
Magnetic Light,Magnetic Flood Light,Magnetic Led Light,18W Mangnetic Flood Light
Jiangmen Dilin Lighting High-Tech Co., Ltd. , https://www.dilinlight.com