xiehe model

Generally, if the CNC machining center is used to make products, buy line rails, and if it is to process molds, then buy hard rails. The precision of line rails is higher than that of hard rails, but hard rail CNC machining centers are more durable.

Features of hard track

Benefits of hard rail cnc machining center:

1. Capable of accepting larger loads, it is suitable for roughing machine tools with large cutting capacity and high feed.

2. Due to the large contact area of the guide rail, the operation of the machine tool is more stable, and it is suitable for machine tools with high requirements on machine vibration, such as grinding machines.

Disadvantages of hard rail cnc machining center:

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1. The material is not uniform. Because it is usually cast, it is easy to produce casting defects such as sand inclusions, pores, and looseness in the material. If these defects exist on the guide rail surface, it will have a negative impact on the service life of the guide rail and the accuracy of the machine tool. .

2. It is difficult to process, because this type of guide rail is generally connected with the main components of the machine tool such as the base, column, work table, slider, etc., so in the process of processing, its shape tolerance, roughness requirements, Aging treatment, quenching treatment and other processes are difficult to control, which leads to the processing quality of the parts not meeting the requirements of the equipment.

3. The equipment is difficult. The word "equipment" means both assembly and assembly, and the process of this assembly is a process of combining skills and physical strength. It cannot be completed by ordinary workers and requires a relative number of skills. , The equipment workers who have a proper grasp of the overall accuracy of the machine tool can only be adjusted. At the same time, they also need to be equipped with spatulas, square feet, square feet, square feet, dial indicators, dial indicators and other corresponding tools.

4. The service life is not long. This can only be relatively speaking. Under the same maintenance and use conditions, the service life of general hard rails is less than that of line rails. This has something to do with their movement methods There is a big relationship, the hard rail is sliding friction work, and the line rail is rolling friction work, in terms of the friction force, the friction force of the hard rail is much greater than that of the line rail, especially Especially in the case of insufficient smoothness, the resistance of the hard rail is even worse.

5. The repair cost is too high. The repair of the hard rail is far more difficult and costly than the repair of the line rail. If there is insufficient scraping allowance, it may involve dismantling all the large parts of the machine tool , re-quenching and machining, or even re-casting the large piece, and the wire gauge only needs to replace the corresponding line rail, basically it will not greatly affect the use of related large pieces.

6. The working speed of the machine tool is low. Due to its movement method and the excessive frictional force it bears, the hard rails generally cannot accept too fast working speed, which is contrary to the current processing concept. In particular, workers in many factories do not have the corresponding maintenance knowledge of machine tools. Many times they only know how to use machine tools, but largely ignore the maintenance of machine tools. The maintenance of machine tool tracks is the most important thing. Once the track is not smooth enough, It will cause track burning or excessive wear, which are fatal damage to the accuracy of the machine tool.

Rail features

The benefits of line rail cnc machining center

1. The cnc machining center is convenient and simple, and high-quality equipment can be realized with a little practice. Because the accuracy of the CNC machining center machine tool is very high, the degree of accuracy depends on the accuracy of the transmission mechanism. The transmission mechanism is generally composed of a wire rail and a screw. That is to say, the accuracy of the wire rail and the screw itself determines the accuracy of the machine tool, and the wire rail Screws and screws generally exist in the form of standard parts. You only need to choose the corresponding accuracy provided by the manufacturer, and generally there will be no major problems.

2. There is a lot of room for selection, whether it is from the structure of the line rail or the accuracy level, the lubrication method or the load-bearing capacity, the processing method to the working speed and other parameters, you can choose according to the specific conditions of the machine tool you plan, Arbitrarily configure the type of track you need.

3. The working speed is fast. Nowadays, many machine tools work extremely fast, especially the idle speed. This is largely due to the contribution of the line rail. Due to the rolling and conflicting working method and high-precision processing, it is truly guaranteed. The accuracy and stability of the high-speed operation of the machine tool have greatly improved the processing power and processing accuracy.

4. High machining accuracy. As a standard product, both the material and the processing method of the line rail have entered a benign controllable range. Therefore, in many machine tools in the field of finishing, most of them use high-precision line rails. Rail is used as the guide rail of machine tools, which also greatly ensures the machining accuracy of machine tools. Domestically, there are Nanjing Technology, Hanjiang Line Rail, Taiwan has Shangyin Line Rail, Germany has Rexroth, Japan has THK Line Rail, etc. , these brands are extremely rich and meet the needs of shopping malls for line rails with different requirements. Personally, I like to choose
Using Japan's THK, the function is stable and the workmanship is precise, but the price is high.

5. The service life is long, because the working method of the line rail is rolling friction, the steel ball in the slider drives the movement of the feeding part by rolling on the track, and the friction force of this rolling friction is smaller than that of the hard rail There are many, so whether it is transmission power or service life, the line
The rails are much more ideal than the hard rails.

6. The repair cost is low. No matter in terms of repair cost or repair convenience, the line rail has its natural advantages and convenience, because as a standard part, the replacement method of the line rail is the same as replacing a screw Yes, of course there are some recovery adjustments in precision, but compared to hard tracks, it is really convenient.

7. The delivery cycle is short, and the general delivery cycle of the line rail can be completed within half a month, unless you choose a foreign brand, such as Rexroth and THK. In fact, these two brands also have corresponding processing plants in China. , as long as the type of line rail you choose is not very biased, basically the delivery period of about half a month can still be guaranteed, and the line rail of Taiwan Shangyin can even achieve a one-week delivery cycle, but The same hard track does not have such a good time to control the ability. If the movement is relatively large, such as recasting, the cycle may be more than a few months.

Disadvantages of line rail

1. The carrying capacity is relatively small. This relatively small is only for hard rails. In fact, the line rails of many major manufacturers have greatly improved their carrying capacity through some structural planning. Of course, they are relatively hard. In terms of the carrying capacity of the rail, it is still relatively small.

2. Compared with the hard rail, the stability is somewhat weaker, such as the ability to resist vibration, etc., but I still want to emphasize that this kind of weakness is relative to the hard rail. In fact, the stability of many line rails is also the same. It's done very well, as long as the equipment you design is not too special, it can generally meet the needs.

3. Special attention should be paid to the maintenance of the line rail during transportation and installation, because as a standard part, its unique structural characteristics make it in an embarrassing situation that is relatively easy to be damaged, such as the shape is slender and causes the line The rigidity of the rail is insufficient, and it is easy to bend and deform when it is squeezed, resulting in the loss of precision; for example, because it is a steel part, if it is not treated with anti-rust, it will be exposed to water or other solvents during transportation and installation. It is easy to produce rust and corrosion, which will lead to the loss of precision.