CNC machining centers are divided into wire-rail processing centers and hard-rail processing centers. What are the differences between them before? What kind of processing centers are used to process parts and what kind of processing centers are used to process dies? Today, we will talk about this problem in detail, so that we can know whether to use wire-rail or hard-rail when choosing processing centers in the future.
What is the difference between CNC Rail Machining Center and CNC Hard Rail Machining Center?
Rail Machining Center: What is the rail, in fact, its full name is linear guide, generally refers to rolling guide. At present, we often see two kinds of structures: one is the ball guide, the other is the roller guide. The difference between the two is that the ball guide is point contact type and the roller guide is line contact type. In fact, their principles are the same, mainly rolling on the guide rail to drive sliding.
What are the advantages of CNC rail processing center
1. Linear guideway is supported by rolling parts, and its rolling sliding performance is better than that of hard rail friction sliding performance, no climbing.
2. Because of its small friction coefficient, it moves faster.
3. Similarly, because the friction coefficient is small, the wear is smaller.
4. Generally, linear guides are manufactured with better materials and more precise equipment, so their accuracy is also higher.
5. Later maintenance is convenient. After the guide wears out, the replacement of the track is convenient, and the hard track is more troublesome, because the gap should be adjusted.
The disadvantage of CNC rail processing center is that its rigidity is lower than that of hard rail because of its small contact surface.
What is CNC Hard Track Machining Center?
We often talk about the hard rail, which refers to the integrated casting of the guide rail and the bed. Its material ranking is not less than HT250, and the Brinell hardness of the body is between HB180 and HB240. After quenching with high frequency or supersonic frequency, the hardness of the guide rail is generally above HRC 50 degree, which makes it have excellent wear resistance (the steel-inlaid guide rail is also a kind of hard rail). The hard rail used in CNC machining center machine is generally rectangular structure, commonly known as rectangular guide.
What are the advantages of hard rail machining centers?
Advantages: The sliding contact surface of hard rail is larger, which makes the machine tool rigid and stable.
What are the disadvantages of hard rail machining centers?
Disadvantage: Because of the large contact surface, the friction resistance is larger, the wear is faster, the moving speed is limited, and the crawling phenomenon is easy to occur. Therefore, most of the manufacturers of machining centers adopt the guideway plastering technology to reduce the wear and creep defects of hard rail.
How to Select CNC Rail Machining Center and CNC Hard Rail Machining Center
Because the speed of rail processing center is faster and the precision is higher, it is suitable for high-speed cutting. It is more suitable for processing some small precise dies or some workpieces with small hardness and high precision. The moving surface of hard rail processing center has clearance, so it can move, and the friction coefficient is bigger, it is easy to produce adhesion, resulting in processing errors, so the hard rail processing center is more suitable. Joint processing of some parts with high hardness, but not too high accuracy requirements for processing.
Knowing the above knowledge, you must know how to choose the rail processing center and the hard rail processing center.
Cutting tools can be divided into five categories according to the form of workpiece surface.
Tools for processing various external surfaces, including turning cutters, planers, milling cutters, broaches, files, etc.
Hole processing tools, including drills, reaming drills, boring cutters, reamers, internal surface broaches, etc.
Thread processing tools, including taps, plate teeth, automatic opening and closing thread cutting head, thread turning tools, thread milling cutters, etc.
Tools for gear processing, including hobs, gear shapers, shaving cutters, bevel gears, cutting tools, etc.
Cutting tools, including inlaid circular saw blade, band saw, bow saw, cutting tool, TPSG extrusion tap TIN and so on.
In addition, there are combined cutters.
According to the mode of cutting motion and the corresponding shape of cutting edge, cutting tools can be divided into three categories:
Common cutters, such as turning cutters, planers, milling cutters (excluding formed turning cutters, forming planers and forming milling cutters), boring cutters, drills, reaming drills, reamers, cutting tools and saws, etc.
Forming cutters, whose blades have the same or nearly the same shape as the section of the workpiece being processed, such as forming turning cutters, forming planers, forming milling cutters, broaches, conical reamers and various thread processing cutters, etc.
The generating cutter is used to process the tooth surface of the gear or similar workpiece by the generating method, such as hob, shaving cutter, bevel gear planer and hobbing cutter, etc.
1. First of all, the concepts of machining center, engraving and milling machine and engraving machine are different.
At the beginning of our country, only CNC engraving machine, the biggest advantage of engraving machine is engraving, its shortcomings are that it can not carry out some harder materials and workpieces, followed by the later emergence of engraving and milling machine, which makes up for the blank of engraving machine, can engrave, can also milling, is a high-precision CNC machine tool.
The engraving and milling machine is suitable for milling small workpieces and finishing small dies. The suitable materials include copper and graphite. The low-end engraving machine tends to process non-metallic plates with low hardness, such as wood, dichroic board and acrylic board. The high-end engraving and milling machine is more suitable for polishing and grinding wafers and metal shells, while the processing center is large in volume and heavy in weight. Heavy, it is mainly used for the processing of workpieces with larger milling volume, large-scale die, suitable for materials with higher hardness, and also suitable for the opening of common dies.
2. The rotational speed of the machining center is different from that of the engraving and milling machine.
CNC machining center machine tools are usually equipped with 8000rpm / min; the most common engraving and milling machine 240000 RPM / min, engraving machine is generally the same as engraving and milling machine, the speed is very high, if it is used to do high-light processing engraving machine can even reach 80000 RPM / min, the general engraving and milling machine used electric spindle, if the speed can reach 80000 RPM / min, the use of air-floated spindle.
3. The spindle power of the engraving and milling machine in the machining center is different.
The main axis of the CNC machining center is BT-40, while the engraving and milling machine is BT-30. The CNC machining center generally ranges from several kilowatts to tens of kilowatts, while the engraving and milling machine is generally within ten kilowatts.