10 Questions You Should to Know about rotating hydraulic cylinder

It is a big mistake to ask the price when purchasing rotary hydraulic cylinders. The following 8 questions let you test out whether your supplier is professional!

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Q1 What is the dynamic response time of your hydraulic rotary actuator?

The dynamic response of a hydraulic rotary actuator refers to its response speed and precision to external input signals. A high-quality hydraulic rotary actuator should respond quickly and accurately, with good control performance and stability. You can evaluate the dynamic response of the hydraulic rotary actuator by the following indicators: frequency response, adjustment time, and overshoot. Normally, the frequency response range should be between 10-100 Hz, the adjustment time should be between 0.1-1 second, and the overshoot should be as small as possible to ensure accuracy and stability. For example, a high-quality hydraulic rotary actuator should have ultra-low overshoot, typically less than 1 degree.

Q2 What is the load capacity of yourhydraulic rotary actuator?

Bearing capacity refers to the maximum load that the hydraulic rotary actuator can bear. A high-quality hydraulic round actuator should have sufficient load-carrying capacity, be able to maintain stability and reliability and work efficiently under high-load conditions. You can evaluate the load-carrying capacity of a hydraulic rotary actuator by the following indicators: rated torque, maximum torque, load-carrying capacity, and static stiffness. For example, a high-quality torque rotary actuator should have a maximum torque of more than Nm and a load capacity of more than 500 kN. A qualified supplier should be able to provide rotary actuators with different loads to meet the application requirements of different customers on different machines and equipment.

Q3 How long is your hydraulic rotary actuator's warranty period and service life?

The service life refers to the service life of the hydraulic rotary actuator, that is, the time it can work continuously and stably. A high-quality rotary actuator should have a long life, be able to operate stably in different working environments and conditions, reduce maintenance costs and downtime, and improve equipment reliability and stability. You can evaluate the life of a hydraulic rotary actuator by the following indicators: rated life, failure rate, reliability, repair interval, and maintenance interval. For example, a high-quality hydraulic rotary actuator should have a rated life of more than 1 million cycles and a failure rate of less than 0.01%. The ultra-long warranty period is a performance of a supplier's confidence in the quality of its products. The warranty period of an excellent supplier's hydraulic rotary actuator is not less than 1 year.

Q4 Are the size and weight ratio design of your hydraulic rotary actuatorlightweight?

A high-quality hydraulic rotary actuator should have a small size and lightweight design to improve its installation and use convenience. You can evaluate the mini rotary actuator by the following indicators: external dimensions, weight, and mounting method. A high-quality low-profile rotary actuator should have a compact design and small size, which can fit into smaller equipment and space constraints while being lightweight, which can reduce the burden on the equipment and energy consumption. Additionally, it should offer multiple mounting options for ease of installation and maintenance.

Q5 What are the parts of the finished product acceptance of your hydraulic rotary actuator?

The inspections of hydraulic rotary actuators should at least include (but not be limited to) the following points:

1. Surface acceptance: Check whether there are obvious cracks or collision marks on the surface of the oil cylinder, whether there are protective sealing plates at each oil port, whether the oil port thread teeth are damaged, and perform secondary tightening on the fastening bolts.

2. Test run: The tested oil cylinder reciprocates more than 5 times in the full stroke under the condition of no load, whether the output shaft of the oil cylinder moves smoothly, and whether the seal is damaged can be seen.

3. Minimum starting pressure: Under no-load conditions, hydraulic oil is injected into the oil cylinder port, and the relief valve gradually increases the pressure from zero. Observe the pressure gauge and record the minimum starting pressure of the cylinder under test when starting.

4. Torque test: Add the load of the output shaft of the oil cylinder to the rated load, and observe whether the output angle of the oil cylinder can reach the rated angle.

5. Pressure test: Rotate the output shaft of the tested cylinder to both ends of the stroke respectively. Adjust the overflow pressure to 30MPa, hold the pressure for 10 minutes, and check the leakage of each part.

6. Full stroke inspection: Make the output shaft of the cylinder under test rotate and stay at both ends of the stroke. Measure whether the total rotation angle is within the standard range used.

7. Internal leakage test: Rotate the oil cylinder to one end, loosen the oil pipe of the corresponding oil outlet, keep the pressure for 1 hour, and observe whether there is leakage; use the same method to detect the internal leakage of the other side.

8. Fatigue test: Install the oil cylinder according to the customer's application, and load the output shaft of the swing oil cylinder.

Q6 What are the safety devices on your hydraulic rotary actuator?

The safety performance of the rotary servo actuator, including the protection measures of the equipment, the safety of use, etc. A high-quality hydraulic rotary actuator should have good safety performance, which can prevent the operator from being injured and the equipment from being damaged. You can evaluate the safety of the hydraulic rotary actuator by the following indicators: protective devices, safety valves, emergency shutdown devices, and explosion-proof devices. A high-quality hydraulic rotary actuator should have complete safety devices and meet international safety standards to ensure the safety of equipment and personnel.

Q7 Why is your price not the lowest in the market?

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Price is a key indicator of hydraulic rotary actuators, but not the only deciding factor, it should have a reasonable price to match its performance and quality. You can evaluate the price of hydraulic rotary actuators by the following indicators: performance, quality, lifespan, durability, and after-sales service. A cost-effective hydraulic rotary actuator not only has a reasonable price to meet the needs and budget of customers, but the manufacturer should also provide high-quality after-sales service to assist customers in market maintenance.

Q8 Whatis your real lead time?

The delivery cycle not only reflects the delivery time but also reflects the supplier's supply stability. High-quality rotary actuator manufacturers should have short lead times, stable supply chains, reliable logistics systems, and sufficient inventory of conventional models, etc., to meet customers' procurement needs and project progress.

If you work with hydraulic systems, you may be familiar with hydraulic cylinder honing, the process of smoothing and finishing the internal surface of a cylinder. Honing is an essential part of maintaining hydraulic systems, but many people have questions about the process. In this article, we’ll answer the most common questions and provide you with expert tips to get the best results.

What is Hydraulic Cylinder Honing?

Hydraulic cylinder honing is the process of smoothing the internal surface of a cylinder by using an abrasive tool to remove any imperfections. The process involves rotating an abrasive honing tool in the cylinder bore while moving it up and down. The honing process removes any high spots and creates a crosshatch pattern on the cylinder walls. This improves the seal between the piston rings and the cylinder wall.

How to Hone a Hydraulic Cylinder?

To hone a hydraulic cylinder, you will need an abrasive honing tool and a tailored machine. First, you need to attach the honing tool to the honing machine and set the machine to the appropriate speed. Then, insert the honing tool into the cylinder bore and start the machine. Move the honing tool up and down while rotating it in the cylinder bore. You should continue honing until the crosshatch pattern is visible on the cylinder walls.

Is It Necessary to Hone Cylinders?

The first question you might be asking is whether honing a hydraulic cylinder is necessary. The answer is, yes, it is essential to maintain the performance and longevity of hydraulic systems. When a cylinder is used, the internal surface can become rough and develop imperfection. This can affect the seal between the piston rings and the cylinder wall. Honing removes these imperfections, which ensures a proper seal and improves performance.

How Much Does Honing a Cylinder Remove?

The amount of material removed during honing depends on the condition of the cylinder and the grit of the honing tool. Typically, honing will remove only a small amount of material, usually less than 0.002 inches. However, if the cylinder is severely damaged or worn, more material may need to be removed to achieve a smooth surface.

What is the Proper Way to Hone a Cylinder?

The proper way to hone a cylinder will depend on a variety of factors. These include the type of cylinder you’re working with, their condition, and the specific honing tool that you’re using. In general, however, the process involves attaching a honing tool to a drill or other rotary tool and inserting it into the cylinder. The tool is then moved back and forth while applying a small amount of pressure. This gradually removes material from the inside of the cylinder.

The proper way to hone a cylinder is to follow these steps:

1. Clean the cylinder thoroughly.
2. Choose the correct grit for the hone tool.
3. Use the proper honing oil.
4. Insert the hone tool into the cylinder bore.
5. Turn on the honing machine and set it to the appropriate speed.
6. Move the hone tool up and down while rotating it in the cylinder bore.
7. Continue until the crosshatch pattern is visible on the cylinder walls.
8. Clean the cylinder again.

This video is a demonstration as to how a honing machine works.

The video shows HEMS’ honing bench, the HEM CH14. A particularity of this bench which you may come across is the fact it has an automated design. The entire machine can be controlled from a screen, where at the press of a button you can order your cylinder to be honed. This reduces labour costs, and increases worker safety. 

How long should you hone a cylinder for?

The length of time that it takes to hone a cylinder will depend on the condition of the cylinder and the specific honing tool that you’re using. In general, however, it can take anywhere from a few minutes to several hours.

Does honing increase bore size?

One common question that people have about honing hydraulic cylinders is whether it can increase the bore size. The answer is that it depends on the specific honing tool that you’re using. Some tools are designed to remove material evenly from the inside of the cylinder, while others can cause the bore size to increase slightly.

Should you use oil when honing a cylinder?

Yes, it’s generally recommended to use oil when honing a hydraulic cylinder. The oil helps to lubricate the honing tool, which can make the process more efficient and effective. It also helps to prevent the cylinder from overheating, which can cause damage.

How much metal will honing a cylinder remove?

As mentioned earlier, honing a cylinder typically removes a very small amount of material – usually no more than a few thousandths of an inch. However, the specific amount of material that is removed will depend on a variety of factors, including the condition of the cylinder and the specific honing tool that is used.

What oil is best for honing a cylinder?

When honing a hydraulic cylinder, it’s generally recommended to use a high-quality honing oil that is specifically designed for the process. The leading honing oil suppliers are Goodson, Premier Lubricants, and Pacehigh. However, you can also find what you need on eBay or Amazon. HEMS Honing Machines are self-feeding oil, making them vastly easier to use. These oils are formulated to provide excellent lubrication and cooling. This can help to prevent cylindrical damage and ensure that the honing process is as efficient and effective as possible.

Do you need a new piston after honing?

A further frequently asked question is whether a new piston is required after honing. The answer, for the most part, is no. I am sure this is the answer many wanted to hear, as this is another cost that is reduced by getting a honing machine. However, it is worth noting that if the seal holders are damaged, then it would be in your best interest to change the piston. If not this could damage the cylinder, causing leakage.

What grit to hone hydraulic cylinders?

When it comes to honing a hydraulic cylinder, it is essential to have the right grit. The grit size will determine the roughness or smoothness of the honed surface. If the grit is too coarse, it can leave deep scratches on the surface, causing premature wear and tear. On the other hand, if the grit is too fine, it may not remove enough material, resulting in an inefficient surface finish. According to a study by the American Society of Mechanical Engineers, the ideal grit size for honing a hydraulic cylinder is between 220 and 320. This range provides a balanced surface finish that is both efficient and durable. When selecting the grit size, it is important to consider the material being honed, the desired finish, and the operating conditions of the hydraulic cylinder.

Conclusion:

In conclusion, honing hydraulic cylinders is an essential process in maintaining the integrity and functionality of hydraulic systems. Honing helps to remove scratches and other imperfections from the cylinder bore, resulting in smoother and more efficient operation of the hydraulic system. Honing also helps to extend the life of hydraulic system components, such as pistons and seals, by reducing the amount of wear and tear they experience during operation.

By following the proper honing procedures, such as selecting the appropriate grit, using the correct lubricant, and monitoring the honing process, you can achieve excellent results and improve the performance of your hydraulic system. It is important to consult with an experienced professional before honing your hydraulic cylinders to ensure that you follow the correct procedure and avoid damaging your hydraulic system.

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