How to choose an iron shaft manufacturer? How to choose a manufacturer of machining center spindles

1. Carbon steel and other high-quality carbon structural steels have many applications because of their high comprehensive mechanical properties, among which 45 steel is the most widely used. In order to improve its mechanical properties, it should be normalized or quenched and tempered. For shafts that are not important or have less stress, carbon structural steel such as Q235 and Q275 can be used.

2. Alloy steelAlloy steel has high mechanical properties, but it is more expensive, and it is mostly used for shafts with special requirements. For example, for high-speed shafts using sliding bearings, low-carbon alloy structural steels such as 20cr and 20crmnti are commonly used, which can improve the wear resistance of the journal after carburizing and quenching; The rotor shaft of the machine works under the conditions of high temperature, high speed and heavy load, and must have good mechanical properties at high temperature, and often uses alloy structural steel such as 40crni and 38crmoala.

The blank of the shaft is preferentially forging, followed by steel; For larger sizes or complex structures, cast steel or ductile iron can be considered. For example, the manufacture of crankshafts and camshafts with ductile iron has the advantages of low cost, good vibration absorption, low sensitivity to stress concentration, and good strength. The mechanical model of the shaft is that the beams are mostly rotated, so their stresses are usually symmetrical cycles.

The possible failure modes are: fatigue fracture, overload fracture, excessive elastic deformation, etc. Some parts with hubs are usually installed on the shaft, so most shafts should be made into stepped shafts, and the amount of cutting is large.

Tihao Machinery has always done an excellent job in iron shaft processing. The product has attracted the attention of many buyers.

What I am familiar with is Tihao Machinery. The quality is good, the production process is good, and it is indeed recognized.

Shafts are often made of carbon steel and alloy steel. Carbon steel is cheaper than alloy steel, and has a lower sensitivity to stress concentration, so it is more widely used. Alloy steel has high mechanical strength and good quenchability, but it is more sensitive to stress concentration and more expensive, so heavy-duty or important shafts, shafts that require small size and light weight, shafts that require high wear resistance and work in special environments such as high temperatures, often use alloy steel. Cast steel or ductile iron can also be used for large size and complex shape (such as crankshaft), but the quality of cast steel is not easy to guarantee, and defects such as shrinkage porosity are easy to appear.

Ductile iron has the advantages of low cost, good vibration absorption and wear resistance, and low sensitivity to stress concentration, but the quality of ductile iron needs to be guaranteed by a good casting process.

Machining requirements of non-standard spindle: the taper hole in the spindle is mainly used for the installation of the center or other tools, and the axis of the spindle taper hole should be coaxial with the axis of the support shaft during installation. There will be a nut on the non-standard spindle, and the nut should be installed in the rolling bearing clearance, so when installing, it is necessary to ensure that the section of the nut is tilted, so as to ensure the rotation accuracy of the spindle.

Choose custom processing high-quality non-standard spindle to look for Tihao, professional quality, quality assurance!

To identify the quality of the spindle, you can see whether the manufacturing of the spindle is rough and whether the chamfer is uniform, the surface of the spindle is relatively smooth, and the chamfer is also very uniform. Then look at the production materials of the non-standard spindle to see if the raw materials used in the processing of the spindle meet the requirements. In the process of using the spindle, do not use sharp objects to hit the spindle, which will affect the machining accuracy of the spindle and the quality of the machined parts.

Now the development of CNC technology is very fast, so the requirements for the spindle are also high, because the high requirements for the spindle will improve the processing efficiency of the machine tool, thereby shortening the processing cycle. In the design of non-standard spindles, we should pay attention to the principle of structural symmetry, and now the interference connection is generally used when connecting, so as to realize the transmission of the spindle. Since interference connections do not bend the spindle, it does not affect the accuracy, and the spindle can be balanced when used.

How to identify the quality of the spindle:

1. To identify the quality of the spindle, you can see whether the manufacturing of the spindle is rough and whether the chamfer is uniform, and the surface of the spindle is relatively smooth, and the chamfer is also very uniform.

2. Then look at the production materials of the non-standard spindle to see whether the raw materials used in the processing spindle meet the requirements.

3. Another way is to look at the machining quality of the spindle, and the quality of the spindle processed by the spindle is also very good, and there will be no problems in use.

Machinery Village is a professional forum to ask.

It involves the tolerance limit fit to determine the base shaft system. The diameter of the shaft is 3mm, in order to ensure the compactness of the fit, the basic size of the inner diameter of the bearing and the inner diameter of the gear is 3mm, and you can choose a transition fit or a clearance fit. Key connections can also be selected.

You can consult a professional bearing dealer.

1. The adaptation type of the coupling.

Coupling is part of the standardized production of products, in the beginning of the selection of coupling, you can understand the national standards, machinery.

Whether there are types of coupling products that meet the needs of use in industry standards and national patents. Couplings could not find an adaptation class.

type, you can contact the manufacturer to design the coupling products by yourself.

2. The variety type of coupling.

The selection of the variety and type of coupling is based on the comprehensive function of the coupling in the transmission system to determine, the overall design of the transmission system, such as the type of prime mover, the type of working load, the speed of the prime mover, the transmission accuracy, the shaft offset, the state of the working environment, etc., is the main reference basis for the selection of the coupling.

3. Torque and primary selection of coupling.

The torque of the coupling should meet the requirements of the power machine of the transmission system, according to the power and speed of the power machine and the working machine, it can.

The reasonable torque value of the coupling is calculated to preliminarily select the coupling.

4. Adjust the model of the coupling.

After the primary selection of the coupling, the size of the coupling should be determined according to the shaft diameter and shaft hole length of the driving shaft and the driven shaft, and the coupling should be adjusted.

Specifications of the shaft. The adjustment of the coupling model should also consider whether the speed between the driving shaft and the driven shaft connected by the coupling is always and whether the shaft diameter is the same.

5. The connection form of the coupling.

The coupling form is determined by the connection form of the driving shaft and the driven shaft, and the most commonly used connection method is the key.

Join. 6. The final selection of the coupling.

At the end of the coupling selection, all factors should be considered again to ensure the size, torque, shaft diameter and shaft of the coupling.

The holes are matched with the prime mover and working machine, and can adapt to the working environment. After the coupling is selected, the strength of the key should be checked and calculated, and the model of the coupling should be determined.

When the shaft and shaft are to be connected to transmit power, it is generally connected with pulleys or gears, but if the two shafts are required to be in a straight line.

If constant velocity rotation is required, a coupling must be used.

The concentricity between the two axes will change due to the machining accuracy, the heating expansion of the shaft or the bending of the shaft during operation, so the flexible coupling can be used as a bridge to maintain the power transmission between the two shafts, and to absorb the radial, angular and axial deviations between the two shafts, so as to prolong the life of the machine and improve the quality of the machine.

The stepper motor coupling is mainly used to connect the stepper motor shaft and the driven shaft to transmit torque, and needs to have more precise transmission performance.

1. Zero clearance: the coupling as a whole is not allowed to have clearance during the transmission process;

2. High rigidity: the coupling is not allowed to have the hysteresis of the transmission, otherwise it will seriously affect the accuracy of the stepper motor transmission;

3. Low inertia: on the basis of ensuring the transmission strength, the weight of the stepper motor coupling should be reduced as much as possible; 4. Good flexibility: The precision stepper motor coupling not only requires high rigidity, but also needs to correct various deviations between the driving shaft and the driven shaft generated during the installation process.

1. Plum blossom coupling

1. The plum blossom coupling has high flexibility and rigidity at the same time, and different hardness elastomers can be selected according to the requirements;

2. Zero gap transmission, there is a great compression force between the plum blossom elastomer and the metal shaft sleeve to ensure that the two are closely attached;

3. The shaft hole adopts a clamping structure to ensure that there is no gap between the shaft and the hole;

4. Polyurethane elastic spacer connection, excellent electrical insulation performance;

5. The operating temperature is between -20 and 60.

2. Diaphragm coupling

1. The diaphragm coupling is divided into a single diaphragm structure and a double diaphragm structure, of which the double diaphragm is more flexible;

2. Compared with other forms of stepper motor couplings, the rigidity is higher;

3. It has good thermal insulation performance;

4. The shaft hole form is divided into two types: clamping type and expansion sleeve type, among which the expansion sleeve type can withstand a large moment of inertia, and is generally used for CNC machine tool (machining center) spindle connection.

3. Elastic coupling

1. Integrated slit cutting metal elastic coupling;

2. Eccentricity, declination and axial deviation can be tolerated;

3. High torque rigidity and excellent sensitivity;

4. The clockwise and counterclockwise rotation characteristics are exactly the same;

5. The coupling made of stainless steel can cope with harsh environments.

You can choose the right coupling for you according to the characteristics of the above couplings