Comprehensive interpretation of plasma cutting machine selection

Perfect Laser plasma cutting machine

In recent years, the annual market demand for CNC plasma cutting machines in China has reached 2,000 units, and there has been an increasing trend year by year, especially in industries such as ships, construction machinery, bridge construction, and steel structures. At present, China is rapidly developing to high-end CNC in plasma cutting applications, and it has broad development space in various industries.

The main advantage of plasma cutting lies in cutting large-thickness metal workpieces. The plasma cutting speed is fast. Especially when cutting ordinary carbon steel sheets, the speed can reach 5-6 times that of the oxygen cutting method, the cutting surface is smooth, and the thermal deformation is small with no heat-affected zone. Plasma cutting work gas can be used (working gas is the plasma arc of the conductive medium, but also carrying heat, and exclude the molten metal in the incision) on the plasma arc cutting characteristics and cutting quality and speed have a significant impact. Common plasma arc working gases include argon, hydrogen, nitrogen, oxygen, air, water vapor, and certain mixed gases.

Do you purchase a cutting machine because of the need for frequent repairs and maintenance? Are they engaged in some work items that require a high-performance cutting device? Or do you need a new equipment to replace the chainsaw you are using now? All of the above are enough for you to consider plasma cutting.

1. Price. No matter what kind of plasma is purchased, it is very important to consider the factor of budget, because if you ignore the budget, even if you can achieve the desired effect, if you exceed the budget, you will not necessarily buy it. At present, plasma is mainly divided into domestic and imported two categories, of which the domestic price is divided into three types: low, medium, and high, but overall users should still be able to accept it! The price of imports is relative to domestic production, it is several times higher, and up to several times, and supplies like cutting nozzles and electrodes are expensive! Under normal circumstances, the imported plasma is better than the domestic plasma with the same specifications, the cutting effect is better, the disadvantage is that the price and the late use of the cost is too high, the average business is difficult to accept!

2. Cutting thickness. No matter what kind of plasma, it has its own most suitable cutting size range, usually low-power plasma suitable for cutting thin plates, which is well-known, plasma power is too large, but not suitable for cutting thin plate! At present, domestic steel plates below 2mm use domestically produced 40-60A plasma cutting, and occasionally use imported ones, but the quantity is not much, because the price is relatively expensive. In this serious statement, less than 2MM below the steel plate, remember that in addition to use high-speed desktop plasma cutting machine, any other models: such as portable, gantry, etc. are not suitable for cutting. More than 2mm is not subject to this restriction and can be used. Thicker steel plates such as 2-16mm steel plates, portable and gantry models can be cut, and thicker, such as 25mm plate or even thicker, only the gantry type is the right choice!

3. The cutting material, this general metal processing technical personnel knows that plasma is used to cut stainless steel and other alloy materials is its strengths, carbon steel plate is mainly rely on the flame cutting method to work, so as long as there is stainless steel, it must be matching Plasma cutting machine! Otherwise, the use of flame can not be processed!

Detailed instructions for the plasma laser cutting machine configuration

1） Mast structure:

Cutting machine mast mainly consist of main beam and two longitudinal end frame.

Main beam: special rectangular tube welded into a box-type structure, all the rectangular tubes used in the welding before have been aging treatment. Rectangular pipe tail welding in the welding beam to ensure the strength of the circumstances in the interval welding, the welding stress control in the smallest range. Good rigidity, high precision, light weight, small inertia and other characteristics.

Longitudinal end of the frame: the use of welded steel plate forming, the vertical position in the longitudinal end of the longitudinal drive connecting frame, so that the machine's longitudinal drive system installed in the center of the machine to ensure the smooth operation of the machine. The main frame is also equipped with operating platform for easy operation of equipment. All structural members of the longitudinal end frame will be subjected to surface shot peening and vibration stress relieving treatment after being spliced so that the surface quality of the structural member is good and the welding stress is eliminated.

Cutting machine gantry: is to ensure the accuracy of the machine work and run the key components of stability, so the control beam and the end of the processing is significantly important.

2）Drive part:

Longitudinal drive: vertical working accuracy and positioning accuracy of the relatively high demand, the machine uses high-precision bilateral gear, rack drive, gear, rack gear meshing between spring-loaded, so that on the one hand can reduce the engagement error, but also improve Transmission stability. Machining precision and installation accuracy are the prerequisites for guaranteeing the precision of the host computer. Coupled with the precision planetary gearbox and stepping system, under the control of CNC system, coupled with the optical encoder to speed and position detection control, It is easy to control the working accuracy of the machine. Machine speed control using variable frequency drive amplifier, not only in the entire speed range to ensure that the machine has good transmission characteristics, but also in the speed range to ensure the positioning accuracy of the machine.

Two ends of the main end frame are respectively equipped with horizontal guide wheels, the direction of the rack faces is a fixed guide wheel, the opposite is an eccentric guide wheel, the straightness of the bottom of the end frame and the guide rail can be adjusted by the eccentric wheel to make the mast stable during movement Straight-line guidance.

Horizontal drive: horizontal drive work accuracy and positioning accuracy requirements and longitudinal drive the same, horizontal drive guide using linear guide. Adopting the same drive control method in vertical direction, namely high-precision gear and rack drive, coupled with high-precision precision planetary gear box and DC stepper system, under the control of CNC system, coupled with optical encoder speed and Position detection control, it is easy to control the working accuracy of the machine. Machine speed control using variable frequency drive amplifier, not only in the entire speed range to ensure that the machine has good transmission characteristics, but also in the speed range to ensure the accuracy of the machine.

Control System: Drive Name: Japan's Shinano; Motor Type: Stepper Motor

Motor Features: The all-digital, maintenance-free, precise positioning of the encoder to detect errors between the operation of the machine, and the error between the main rack and vice feedback to the computer to correct its errors, thus ensuring the smooth operation of the machine.

3）Transmission part:

Vertical and horizontal transmission gear rack and pinion, coupled with planetary gear reducer, with low backlash, high output torque, low noise, long life lubrication and other characteristics, so as to achieve high precision positioning drive.

●Reducer:

Reducer type: box precision planetary reducer

Reduction ratio: 8: 1

Features: high precision, good rigidity, high torque transmission, high efficiency, small inertia, small temperature rise, maintenance-free

●Horizontal rail:

Precision linear guide transmission.

Features: High precision, ultra-quiet, maintenance-free, long life, since the dust and so on.

●Longitudinal guide and rack：

The guide rail is made of high-strength 18KG heavy rail. The top and the sides of the guide rail are precision machined and machined. The precision racks are arranged on the outer side of the guide rail. Longitudinal rack with high precision machining.

Longitudinal rack with pitch rack, because the CP gear per revolution take a distance is an integer, which can greatly reduce the cumulative error of the machine, especially the guide rail longer machine, its advantages are more prominent.

For rail mounting accuracy and rack and pinion clearance to eliminate the problem, mainly by a single rail to determine the accuracy of processing. My company's rail machining accuracy to ensure that all the flatness are 0.02mm, the long rail installation, we use steel wire fixed at both ends of the rail, by adjusting the level of the floor, left and right rails, when the rail to adjust the installation accuracy When required, press the rail with the pressure plate. Between the rails with tension rod connection, so as to ensure the rail and rail with the match.

For more info, welcome to visit: https://www.perfectlaser.net/plasma-cut/