It can be difficult to decide to use grinding or hard car to finish the parts, and it is generally not intuitive. The two processes can reach extremely high tolerances and surface roughness. The most effective choice depends on the characteristics of parts, materials, lot size, equipment production capacity and several other factors.
Move, always hard
When you decide to use the car or grinding to finish the processing of the part, the old computer standard is that the hard car is costly, but if the size and the surface roughness requirements are high, only crushing can grinding be selected.
Faced with today’s driving and grinding technology, these hypotheses are wrong. Using the right machine-tool, the hard car cut can provide 70HRC materials (including hard alloy) to provide high tolerances and surface roughness. But in many cases, grinding can always be a higher and more effective choice. It fully depends on the allocation of parts, materials, the production capacity of equipment, the size of the lot and several other factors.
He has more than 70 years of experience in the fields of Danabat, Overbeck and Hambraig, and Dinobart is over 70 years old in the field of the manufacture of precision grinding machines and hard car towers. The designer has no bias for these two technologies. However, some general views can help application engineers start to think in the right direction. Under these two processes will be described.
Basic information
First of all, we have to distinguish the tower hard. Hard cars can be completed on various standard rounds, but compared to grinding, they cannot generally be carried out. However, the precision hard car lathes produced by Dinorbat Hambretis are higher precision, the precision range is at the level of the sub-seam and surface roughness is 0.1 to 0.4 Micron RA. Car cut. It is a simple and reliable process, with many advantages, in particular when processing the complex shape and parts of internal and external diameter.
The internal diameter and the grinding of the outside diameter, involuntary grinding and composite machine tools with turn and grinding functions always occupy an important position. Danorbart manufactures all these machine tools to determine which process can provide the most effective options for specific applications.
In general, in the following circumstances, the hard car cut is the most advantageous
The round part has a complex geometric shape and / or a combination treatment diameter / external diameter
The high mixed / low capacity environment requires frequent machine tool parameters
Maybe air rotation
The move is always the best choice to treat the following parts
Barbon and / or high length ratio
Interference surface force
The treatment of parts that operate for a long time requires the same coherent process
The shape of the room cannot be turned
The advantage inherent in hard driving is that it is a simpler and more flexible process. From the point of view of the adjustment and management of processes, it is almost not different from traditional – easy -easy towers on the program and practical to replace unique point tools. The cost is considerably reduced, especially for the pieces that were to be sculpted and ground before.
The main advantage of grinding is that this is a more stable process. The performance of sand wheels remain unchanged throughout its life cycle, and online measurement can guarantee that it can reach a high CPK value in the production and treatment process. Although a single point car knife tool can be easily replaced, the wear speed is faster when processing hard materials and the cost of the overall tool is generally reduced with the treatment of grinding. Cillar grinding can be the only choice for unsolved or non -circular parts.
The following elements will introduce more on each process:
Hard car cut
Why cannot almost all the machine tools be precise and hard? The greater the material, the greater the resistance of the cutting part, the greater the cutting force will exert a greater anti-dollage force on the guidance rail.
Traditional CNC cars cannot withstand this warming force at all, resulting in insufficient formation, poor surface roughness and an increase in the wear of tools. The hard tower of real precision will provide lasting precision (sub-seam) and a longer life of knives.
Hamboig has resolved these needs via several key machine tool components. The database of the hard tower is in natural granite, which is better than melting in terms of hardness, thermal stability and capacity to reduce vibrations. The tooltip is equipped with a static pressure guide rail and the floats axis on the pressure oil film. Without surface contact with surfaces, the guide rail can work without friction and wear without wear, which is extremely important for hard cars, which can further improve the anti-vibration resistance capacity of the tool-tool. This allows the Hambraig machine to reach the precision of the 0.5-1 microns shape, the surface roughness of 0.15 micron RA and the precision the size of ≤ 1 micron.
These functions allow machine tools to make precision and hard car cuts, such as ::
Nuts
Ringing ring and roller bearings
Hydraulic part
Tree and driving equipment
Various mold and punch components
The part generally treats the following materials in the cut of the hard car, such as rolling steel with hard relaxation, high speed steel, mold steel, carbureuring steel, carbonized alloy and exported aerospace materials, such as nickel chromium iron alloy.
Grind
For various forms of cylindrical grinding, an obvious debate is to use ultra-procurement pieces. The extremely precise grinding process can reach the precision of the shape of 0.5 to 1 microns, the size of size ≤ 1 micron and the surface roughness of 0.1 micron RA. However, the concept of grinding is only suitable for high -end parts is completely wrong, and grinding is probably low -cost options in various applications.
In any reason, the grinding machine can produce almost all the characteristic parts by configuration, including certain parts which cannot be produced on the Tour. The configuration of the grinding machine is a circular part includes:
Universal grinding machine (interior diameter / outside diameter)
Whether you want a machine tool which is treated only in the outside diameter, the inner diameter or the internal and external diameters, there are many grinding machines to choose. The grinding machine of the interior diameter / outside diameter offers great flexibility, which can produce various rounds or other room shapes. In some applications, peeling type grinding (using a narrow wheeled grinding part) can be comparable to the effectiveness of the unique hard car cut in certain applications.
Involuntary grinding
Although the involuntary grinding machine has existed for a hundred years, it is always the most effective choice for various trees grinding applications. Many people tend to think that inadvertent grinding is mainly to treat simple cylindrical shapes, such as grinding stems. Involuntary crushing beds are really good in this area, but can also be personalized as crushing beds of fine grinding multiplerist parts.
Surprisingly, although the diamond and CBN wheels can be very expensive, the cost of cutting tools is generally relatively low. In some current cases, up to 200,000 or even 500,000 parts which can be processed before being replaced. Even if the cost of the sand wheel is very high, the average part is lower than one point. It is not only a tool cost.
Which process processing part is selected?
If there is a clear set of standards to determine whether the work room should be precision or grinding, it is ideal. However, things have never been so simple. Suppliers with rich experience in these two processes can provide fair suggestions and help them cooperate with them. The following applications can explain it.
These formwork (Figure 1) are made of 100CR6 steel with a hardness of 60 HRC. Based on the previous craftsmanship, manufacturers hope to reduce the stages of the process, reduce the beat time and improve the quality of the products. In the new process, the outside diameter is 330 mm (about 13 inches), and the outside diameter and the inner diameter of the inner ring of the bearing are carried out. The precision hard car cutting process can maintain the inner diameter of the concentricity and the cone degree in <3 microns, the thickness of the wall <3 microns and the cone -shaped angle is ± 20 seconds arc. Finish treatment in 12 minutes.
These inner ring cone bearings (Figure 2) are treated by the grinding bed. With a similar goal of reducing costs and improving quality, the material of the inner ring is 100Cr6 in steel with a 62hrc hardness. 72.72 mm (2,863 inches) The outside diameter and the brut and finely, round pass <2 microns, RA <0.4 microns. The beat time is only 90 seconds.
These two cases have good know-how, but they have different conclusions for the best treatment technologies. When you determine which technology should treat the part, cooperate with experts with relevant knowledge, so that it is very useful to help indicate that management is very useful. As mentioned at the beginning, decision -making depends on various factors. The unique advantages of Danorbart can help, not only the creation of precision shredders, but also the most precise precision tour in the world, which can face the problems of application without bias.
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.
