Selection Criteria for Hydraulic Cylinder Seal Supporting Material

Hydraulic cylinder is completed by the fuel tank of the main construction machinery parts. Bearings, punches impact on the quality of the cylinder bushing material, bearing non-metallic materials are usually used for nylon 1010 and polyoxymethylene liner.

First, the bearing assembly parts and assembly clearance

1. The inner sleeve of the bearing sleeve on the guide sleeve (the material is ductile iron), the punch acts as the inner and outer diameter of the piston rod to guide and support the optimum design of the piston rod, 0.08-0.08 mm. When the resistance is less than 0.08 mm, the piston rod and the cylinder shaking movement, the bearing with sound, when the liner wear faster, serious, loss of support role; clearance more than 0.16 mm, it is easy with the piston rod partial grinding, lining Sets of force, unilateral leak cylinder, piston rod oil.

2. Bearing bushings and cylinder contact within the cylinder, 0.1-0.1 mm is the best design of the outer diameter of the gap. And the movement resistance of the piston rod is increased so that uniform movement can not be maintained and the oil temperature is high. Propagation is less than the bearing lining, punch piston rod baffle or piston is easy to cut into the outer cylinder wall, serious waste when the cylinder.

Visible, is essential to the quality of the cylinder assembly gap. Assembly clearance should be adjusted bearing bushings, as shown in Figure 1, bearing bushing assembly to adjust the gap to the size of the main B, the tolerance requirements of millimeters. Two kinds of materials

Second, the performance characteristics

Nylon 1010 strength, rigidity, heat resistance, forming technology is better; water absorption and shrinkage, dimensional stability, greatly affected by temperature, the working temperature range of – 30 ~ 80 ℃.

POM is a high melting point, high density, crystalline linear polymer, punch has a good overall performance, tensile strength, impact toughness, hardness, fatigue strength and creep resistance and dimensional stability are very good, small Water absorption, chemical resistance and solvent resistance, especially good resistance to organic solvents and oils. Even at high temperatures, the change in weight of polyoxymethylene in general organic solvents is only 0.3% to 0.3% with only 0.1% to 0.1% change in size. Operating temperature is generally – 40 ~ 140 ℃. The disadvantage is the thermal decomposition, forming more difficult than nylon.

Third, the scope of application of the two materials and treatment methods

1. Nylon 1010 has a high hardness, rigidity, good processing technology, but subject to a great temperature. Applicable to construction machinery, press machine equipment, such as less affected by temperature.

2. POM has excellent mechanical properties, and can be used for thermoplastic general molding method, in the automotive industry, machinery industry, electronics industry, building materials and other industries widely used. Instead of copper, zinc, aluminum and other non-ferrous metals production structure POM can be. Particularly suitable for the production of frictional resistance and high load part.

3. The two materials have good practicability and operability. Cast into a rod or pipe with raw materials, can be processed with an ordinary lathe molding, you can also adjust their research and other processing after molding. As a result, it is applicable not only to mechanical manufacturing, but also to maintenance of equipment.

Fourth, select the lining material

According to the above two material properties of the analysis, the working temperature of the cylinder, punch to determine the material selected as the main basis for the bearing bush. Nylon 1010 with the general operating temperature; usually, the cylinder at high temperatures should be selected POM as bearing bushings. Our factory has been producing a number of nylon 1010 bearing cylinder cylinder, processing dimensions are in line with the design, punch assembly gap adjustment is also within the scope of the design requirements. Perform the pressure test as required to assemble the cylinder. But because it is produced in the summer, the higher the ambient temperature, the cylinder piston rod shaking part, accompanied by sound, and so on, and so on.

Serious maintenance found that nylon bearing dimensions outside the tolerance, the direction of the standard diameter than 0.10 mm. Punch In order to verify the validity of this conclusion, we have done an experiment. Spend a few minutes in the size of the nylon 1010 bush and place it into the beaker to add enough water to the boil. 8-10 hours, measurement and expansion of more than 5%. Punch using paraformaldehyde as a bearing bush, cylinder crawling, trembling, and this phenomenon, such as sound after being eliminated.

How to use the punch oil to extend the service life of the machine

After a period of manipulation of the press, then it is necessary to practice a certain affection for it, then there is a certain degree of association with the smooth, and you want to lubricate the combat skills, then deal with the use of lubricants you Need to understand the knowledge:

1, N22 and Punch N32 oil equal to the old dull oil (spindle oil No. 3), for the lubrication of the spindle speed of 1500r / m or more, small and medium high-speed cutting machine tools, drilling, grinding machines, milling machines and thread processing machine Such as gear box.

2, N15 oil may be used as punch hydraulic oil, low pressure hydraulic equipment used throughout the press. Such as the hydraulic system of general machine tools, hydraulic jacks, hydraulic balers, hydraulic suppression of oil and landing craft door hydraulic system.

3, N68 oil equivalent to the old 40 mechanical oil, the use of JB23 series tilting punch in the lubrication of the following various mechanical: low-speed heavy machine tools, such as vertical lathe, 1660 lathe, gantry milling machine, planer core box.
In addition, the three commonly used punching oil can also be used for metal processing heat pipe bundle quenching kerosene, cutting oil emulsified oil regret the source of rust oil, and punch can be used soft sesame oil. Then you have to remember these knowledge, determine that you are using the device more durable!

The mechanical advantage of precision presses

1, precision punching bed material with high-grade, high-strength cast iron and a strong tempering and natural aging treatment to ensure that the deformation coefficient is small, accuracy and stability.

2, precision punching high-precision processing equipment, strict process to ensure that all kinds of filtration system to ensure that the dynamic friction coefficient of the body &; 0.03.

3, precision hydraulic locking system, 250 / cm &; 2; high-voltage automatic locking system, easy to operate to ensure that the locking force, precision and solid.

4, Punch, precision microcomputer control system, direct display punch press work status and hydraulic punch failure, dead zone stop control, easy to frame and system self-test, easy to understand and troubleshooting.

5, precision stamping air pressure system, all standard components used to ensure the stability of the system.

6. Press the main system is the use of pressure display, pressure switch protection measures to improve system stability.

7, precision punch guide device using three cylindrical positioning, accurate, stable, testing and maintenance.

8, precision press lubrication system and fully enclosed forced lubrication, the original design of the industrial air duct, the stamping process in the main body of the cooling faster and more natural.

9, precision punch forming operation control system, structural settings, self-locking function, improve operational safety, reliability and accuracy.
Precision punch features:

High steel frame, can withstand large eccentric load.

Precision transmission, to ensure that the long-term precision punching machine.

Multi-function design, a variety of configurations can be automated devices.

Complete man-machine protection, in line with safety standards.

Difference between NC Machine Tool and Ordinary Machine Tool

First, the difference between CNC machine tools and general machine
CNC machine tools on the part of the processing process, in strict accordance with the processing of the parameters and actions specified by the implementation. It is a high-performance automatic or semi-automatic machine, compared with ordinary machine tools, has the following obvious features: 1, suitable for processing complex shaped parts
CNC machine tools can complete the ordinary machine is difficult to complete or simply can not process the complex parts of the processing, so in the aerospace, shipbuilding, mold and other processing industry has been widely used.
2, high precision machining
3, stable and reliable processing
To achieve computer control, excluding human error, parts of the processing consistency, stable and reliable quality.
4, high flexibility
When the processing object changes, generally only needs to change the numerical control procedure, manifests the very good adaptability, may save the production to prepare time greatly. On the basis of CNC machine tools, can be composed of a more flexible automated manufacturing system-FMS.
5, high productivity
CNC machine tool itself, high precision, rigidity, the choice of favorable processing and production, high productivity, generally 3 to 5 times the general machine tools, the processing of certain complex parts, production efficiency can be increased ten times or even several times.
6, good working conditions
High degree of automation, machine operators greatly reduce the labor intensity, the working environment is better.
7, is conducive to the modernization of management
The use of CNC machine tools is conducive to the computer control and management of production development, in order to achieve the production process automation to create the conditions.
8, investment, the use of high cost
9, production preparation work is complex
As the whole process of using the process control, NC preparation of the preparatory work is more complex, including the process to determine, programming and so on.
10, maintenance difficulties
CNC machine tools is a typical mechanical and electrical integration products, high technical content, the technical requirements of the maintenance staff is very high.
Second, the scope of application of CNC machine tools
As the above characteristics of CNC machine tools for CNC machining parts are:
1, small batch and repeated production of parts;
2, geometric shapes of complex parts;
3, expensive parts processing;
4, the need for all parts of the test;
5, test pieces.
The above parts using CNC machining, in order to maximize the advantages of CNC machining.
CNC machine tools – is the numerical control machine tools (Computernumericalcontrolmachinetools) referred to, is a program with the control system of automatic machine tools.
CNC machine tools and general machine main difference is: CNC machine tools with a numerical control system (program control system), can be programmed to achieve automatic processing. The general machine does not have this feature. Other differences and easy misunderstanding:
1. CNC machine tools usually do not need to man-made process, set a good origin and NC program can be prepared.
2. Usually the accuracy of CNC machine tools than the average machine to be high.
3. Not to say that the accuracy of CNC machine tools must be higher than the accuracy of ordinary machine tools, precision depends on the core components used and the design of structural rigidity and assembly techniques and so on.
4. CNC machine tools are usually closed for the protection (also semi-closed protective type), in terms of security than the more reliable machine tools.
5. CNC machine tools must have a numerical control system, or have a CNC system with the machine can be called CNC machine tools. CNC system is the core of CNC machine tools.

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