How To Slove The Internal Burr Issues Of Manifold Block
Do you know of the manifold block? It is the block that controls the work of the hydraulic oil and can gather together the scattered hydraulic oil paths. High design and processing requirements result in a high cost per piece. Not suitable for single small batch production, so we know what specific processing technology requirements? In addition, during processing, a common problem that occurs is internal burr formation in the manifold block. When the burr appears inside the manifold block, you can use the below processes such as chemical, high temperature, electrolytic deburring, and rolling deburring to clean it. Let’s take a look at the details:
How Do We Remove The Burr For Your Valve Block?
When we machine the hydraulic manifold block, you will read below two important processes for the internal burring issues of the valve block to ensure high quality.
- Chemical Deburring
It involves putting the metal parts in chemical solutions (50 ℃). The surface of the metal parts ends up forming ions. These ions gather at the surface after a chemical reaction forms. A layer of resistance ends up forming, and a small conductivity mucous membrane protects the surface from corrosion. Any burr at the surface dissolves.
We can use different chemical solutions depending on the material of the deburring workpiece. The main components of the base can be hydrochloric acid, acid, sulfuric acid, diphenylenimine hydrochloride, and water in proportion. Chemical deburring is suitable for small metal parts and can remove the thickness of less than 0.07mm fine burrs.
- high temperature deburring
We first place the parts that need deburring in a tightly sealed chamber and then send in a mixture of hydrogen and oxygen gas at a certain pressure. After ignition with the spark plug, the mixture gas explodes instantly, releasing a lot of heat, and the instantaneous temperature is as high as 3300℃ or more. Because the explosion time is so short, the hairs of the parts burn off, and the rest of the parts have no time to change. When the explosion, high-pressure gas is everywhere, the burr in all the inner holes, cross holes, grooves, and deep holes of the parts can burn away. We need a special high-temperature deburring machine.
This deburring method is suitable for metal, plastic, and lime parts of any structure shape, especially those with complex shapes and difficult to remove burrs by hand. During the operation, we select the appropriate hydrogen-oxygen mixing ratio according to the materials of different parts. Steel, alloy steel, and copper are not suitable for the mixture. The hydrogen-oxygen mixing ratio can be in the range of 2:12:2, and the road of aluminum alloy is higher than 2:1. Next, choose the inflation pressure.
More Two Cleaning Internal Deburring Methods For Manifold Block
When using the manifold block, you may find that it leaks oil. What do we do in this situation? If it is the aging of the pipe thread seal, then it is necessary to replace the seal. If it is because of excessive oil, it is relatively simple. You only need to control the amount of fuel reasonably. When reflecting on that manifold block, you may see burrs. What do you do on encountering them? We will have another electrolytic and rolling process to remove the internal burring.
What’s The Electrolytic Deburring Process?
This process uses electrical and chemical energy to dissolve the anode and remove burrs. The positive phase edge of the parts and the DC power supply is the anode forming tool. Meanwhile, we connect the negative pole of the DC power supply to the cathode and maintain a certain gap between the two poles to allow the electrolyte to circulate. An electrochemical reaction occurs on the anode surface after immersing the anode and cathode in the solution and passing the direct current. The part’s surface shows the dissolved metal and the electrolyte form a viscous liquid concentrate in the lower part of the surface of the part, with higher resistance and less corrosion.
The burr protruding on the surface of the parts is under the influence of temperature difference. The liquid film helps in burr removal after concentrating the power line on the burr part at the cathode. The nearest burr ends up dissolving at the fastest speed until, part’s surface eventually, all the burrs dissolve. The edge gradually forms a rounded corner, that is, to achieve the purpose of deburring.
We can use an electrolytic deburring machine for this process. When the production volume is not large, we can convert the rectifier into a direct current to make a simple tool. According to the structure of the parts, the production of special fixtures is similar to the shape of the parts (tool cathode). The fixture must be brass or copper, or any other conductive material. Avoid processed parts coated with epoxy resin isolation protection. The most common electrolytes are NaCl, NaN02 and NANO3, and other solutions.
This method is suitable for non-ferrous metal parts. It is especially suitable for parts with complex shapes where mechanical or manual methods may be difficult to remove the inner hole, cross-hole, and inner surface burr. The method can remove burrs from hard parts such as molybdenum, nickel, and titanium.
What’s The Rolling Deburring Process?
- Rolling Deburring
A certain proportion of the workpiece and abrasive are put into the closed drum. In rotating the drum, grinding takes place between the parts and abrasive, which helps to remove burrs. Roller grinding deburring equipment has a special deburring machine and centrifugal roller polishing machine. The abrasive can be quartz sand, wood layer, alumina, ceramics, dolomite, silicon carbide, metal ring, and so on. We choose them according to the material, shape, and size of the parts and the burr position and size.
Using this method, part deformation is small. The equipment is simple, easy to operate. The abrasive source is wide, economical. However, it is difficult to remove big burrs.
If you later encounter manifold block oil leakage and internal burrs, you can refer to the above solutions to deal with them. We hope these methods prove to be helpful to you.
What’s The Solution For The Oil Leakage Of Valve Block?
There will be another issue occurred if you do not well fix the internal burr issues. If so, how do you solve the oil leakage of the manifold block? We adopt solutions that correspond to the cause of oil leakage. The following is the specific cause analysis and introduction of solutions:
- Aging of sealing parts of the thread of manifold block pipe.
The solution is to replace the seals.
- The hydraulic oil seal of the rotary motor of the oil circuit blocks leaks, and the hydraulic oil leaks into the gearbox.
The solution is to replace the hydraulic oil seal of the rotary motor.
- Too much gas.
Need to control the amount of fuel. Note: Oil leakage needs correction. The operation of the plug sealing of the manifold block pipe thread for a short time will not have an impact. Usually, the operation of the plug sealing of the manifold block pipe thread for a long time may cause the wear of the rotary support.
Generally speaking, steel, alloy steel inflation pressure is high, brass second, aluminum alloy lower. Parts need cleaning and baking before deburring; After deburring, it is put into a phosphoric acid mixed solution for neutralization to remove the oxide film.
Hopefully, the article provides sufficient insight into the manifold block processing technical requirements and removal of internal burr. Continue following the series for further insight on hydraulic valves from Creatingway.
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