Is the machining center good for hard rail or linear rail? Finally got it!

Release time:

2021-05-18

Hard rail refers to a casting in which the guide rail and the bed are integrated, and then the guide rail is processed on the basis of the casting. That is, the shape of the guide rail is cast on the bed, and then processed by quenching and grinding. There are also the bed and the guide rail are not necessarily integrated. For example, the steel-inlaid guide rail is nailed to the bed after processing.

▌What is a hard rail? What is a linear rail?

Using hard rail machine tools

Line rail usually refers to the rolling guide, which is the kind used in the linear modules often used in the machine tool industry now. We usually call this type of component "linear guide".

The linear guide itself is divided into two parts: the slide rail and the slider. There are internally circulating balls or rollers in the slider, and the length of the slide rail can be customized. It is a modular component, a standardized serialized single product produced by a specialized manufacturer, which can be installed on the machine tool, and can be disassembled and replaced after wear.

Most of the machine tools in the finishing field use high-precision linear rails as the machine tool guide rails, which also greatly guarantees the machining accuracy of the machine tools. Imports include German Rexroth, Japanese THK, and domestic ones that do better in Nanjing. Craftsmanship, Hanjiang Line Rail, Taiwan Silver, etc.

Machine tools using linear rails

▌ Is the machining center good for hard rails or linear rails?

In fact, there is nothing good or bad about hard rail and linear rail. I can only say whether it is suitable or not, because they have different focuses. Let's take a look at their respective advantages and disadvantages.

1. The advantages and disadvantages of hard rail and its application

The hard rail has a large sliding contact surface, good rigidity, strong shock resistance, strong load-bearing capacity, and is suitable for heavy-duty cutting.

The hard rail is dry friction. Due to the large contact surface, the friction resistance is also large, and the moving speed cannot be too fast. At the same time, crawling is easy to occur, and the gap on the moving surface will cause machining errors. The maintenance of the machine tool track is the top priority. Once the track is not sufficiently lubricated, it will cause the track to burn or wear out, which is fatal to the accuracy of the machine tool.

The application of hard rail is suitable for heavy cutting, large molds, high hardness workpieces, and workpieces with general accuracy requirements.

2. The advantages and disadvantages of the rail and its application

Nowadays, many machine tools run extremely fast, especially the idle speed. This is largely due to the credit of the linear rail; the linear rail can be pre-tightened to achieve zero gap between the rails with high precision; in terms of service life, the linear rail The rail is much higher than the hard rail.

The cutting force of the linear rail is smaller than that of the hard rail. It is only for the hard rail. In fact, the linear rails of many machine tools have greatly improved their carrying capacity.

The application of 　　 line rail is suitable for high-speed machines, high-speed cutting, suitable for processing products and small precision molds. Nowadays, more precision machining centers use linear rails.