Hydraulic Shearing Machine Blade Material & Oil Change Guide
Hydraulic Shearing Machine Blade Material & Oil Change Guide
Blade Material Requirements for Hydraulic Shearing Machines
The cutting blades of a hydraulic shearing machine are typically made of cemented carbide. Compared with high-speed steel (HSS), cemented carbide offers distinct advantages and certain limitations across four key properties:
1. Anti-Adhesion Performance
The bonding temperature of cemented carbide is higher than that of HSS, giving it superior resistance to adhesive wear. This means the blade surface is less likely to seize or bond with the workpiece material during cutting, resulting in longer blade life.
2. Hardness
Cemented carbide contains a high volume fraction of hard carbides, making its hardness significantly higher than that of HSS. The higher the hardness of the cemented carbide, the better its wear resistance — directly contributing to extended service intervals and cleaner cuts.
3. Toughness
The toughness of cemented carbide is substantially lower than that of HSS. As a result, cemented carbide blades are not suitable for applications involving strong impact or vibration. Care must be taken to avoid operating conditions that could cause chipping or fracture of the blade edge.
4. Thermophysical Properties
The thermal conductivity of cemented carbide is higher than that of HSS, allowing it to dissipate cutting heat more effectively. This helps maintain blade integrity and dimensional stability during prolonged shearing operations.
| Property | Cemented Carbide | High-Speed Steel (HSS) |
|---|---|---|
| Anti-Adhesion | Higher | Lower |
| Hardness | Significantly Higher | Lower |
| Toughness | Lower (brittle) | Higher (impact-resistant) |
| Thermal Conductivity | Higher | Lower |
Common Issues During Oil Changes in Shearing Machines
Problems encountered during oil changes in hydraulic shearing machines can be categorized into three main areas:
Issue 1: Using Lower-Viscosity Oil as a Substitute
When high-viscosity lubricating oil is replaced with low-viscosity oil in components originally designed for thicker oil, the sealing performance of the corresponding housings, shaft bores, and other parts may be compromised. In many cases, this can significantly reduce the sealing effectiveness of these areas, leading to oil leaks.
Issue 2: Failing to Clean the Oil Tank Before Refilling
If the oil tank is not cleaned before refilling, contaminants and debris inside the tank can enter the lubrication system. This can clog oil passages, accelerate seal wear, and ultimately cause oil leakage throughout the system.
Issue 3: Overfilling During Oil Changes
Adding too much oil during a change — especially in components with rotating parts — can easily lead to oil overflow. The churning action of rotating elements aggravates the problem, forcing excess oil past seals and gaskets.
Best Practice: Always use the manufacturer-recommended oil grade and viscosity, clean the oil tank thoroughly before each oil change, and fill to the specified level only.
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