CN105333011A - Static pressure supporting oil pad with Wang-word-shaped cavity - Google Patents

Abstract

King-shaped cavity static pressure bearing oil pad. Under the condition of heavy-duty high-speed operation of large-scale vertical CNC machining equipment, the force and thermal deformation of the oil film are large, and the amount of oil thrown away increases, resulting in a large static pressure loss; the temperature rise of the lubricating oil is large, which in turn causes frictional resistance The power consumption caused is large, the transmission efficiency is greatly reduced, and the machining accuracy is reduced. In order to solve this problem, the present invention proposes to design the oil cavity of the static pressure oil pad into a king shape, increase the bearing capacity by increasing the area of the oil cavity, and improve the transmission efficiency by reducing the temperature rise of the lubricating oil, thereby effectively improving the processing engineering The deformation of the oil film in the middle makes the hydrostatic thrust bearing run with high efficiency.

Description

King-shaped cavity static pressure bearing oil pad

technical field

The invention relates to a simple and effective cavity-type structure of a static pressure bearing oil pad, in particular to a Wang-shaped cavity static pressure bearing oil pad.

Background technique

Hydrostatic bearings are widely used in my country's heavy equipment due to their advantages of large load capacity, stable and reliable operation, low frictional resistance, and high rigidity, and have become the core components. my country has begun to increase research on the shape of oil chambers for heavy-duty static pressure bearing oil pads. Under the condition of heavy-duty high-speed operation, the force of the oil film and thermal deformation are large, and the amount of oil thrown away increases, resulting in a large static pressure loss; the temperature rise of the lubricating oil is large, which in turn causes large power consumption caused by frictional resistance. The transmission efficiency is greatly reduced, the machining accuracy is reduced, and in severe cases, the machine is damaged, which brings losses to the economy.

Contents of the invention

The present invention focuses on solving the problems of improving the bearing capacity, reducing the temperature rise of the lubricating oil to reduce the static pressure loss and improving the transmission efficiency, thereby proposing a simple, reasonable and effective Wang-shaped oil cavity static pressure support oil pad to solve this problem question.

In order to overcome this difficult problem, the technical scheme adopted by the present invention is as follows: the king-shaped cavity hydrostatic support oil pad is mainly characterized by a fan-shaped body, and the middle is a king-shaped oil cavity, wherein the area of the oil cavity accounts for 60% of the entire oil pad area. The total thickness of the pad is 20mm, and the depth of the oil chamber is 9mm. There are two oil inlets in the oil chamber to facilitate hydraulic oil to enter the oil inlets.

Compared with the existing technology, the present invention has the following advantages: the temperature rise of lubricating oil in the Wang-shaped oil chamber is small, the frictional resistance is small, the energy consumption caused by frictional resistance is reduced, and the static pressure thrust bearing operates with high efficiency. Compared with the I-shaped cavity, the effective bearing area is enlarged, the bearing capacity is improved, the force deformation of the oil film is small, the oil rejection is reduced, and the static pressure loss is greatly reduced. Compared with the fan-shaped cavity, the structure processing is simpler, the cost is lower, and the bearing capacity is larger. A more reasonable solution is provided for the frictional failure of hydrostatic bearings under extreme working conditions. It also provides technical support for the related theory of static pressure bearing.

Description of drawings

Figure 1 is a three-dimensional perspective view of an oil pad, Figure 2 is a one-twelfth assembly drawing of a single oil pad and a base, and Figure 3 is a schematic diagram of 12 oil pads arranged along the base.

detailed description

Combined with the illustrations of each manual, the king-shaped oil pad 1 of the static pressure support is the main structure of the oil pad, which is fan-shaped. The upper end of the oil pad is a king-shaped oil chamber 1-1, and there are two oil inlets 1-1 in the oil chamber. 2 and 1-3 hydraulic oil flows into the oil chamber 1-1 through the oil inlets 1-2 and 1-3. The total thickness of the oil pad is 20mm, and the depth of the oil cavity is 9mm.

Working principle: 12 identical oil pads 1 are evenly arranged on the base 2 during work, and then the rotary table of the machine tool is installed on the king-shaped oil pad, when the hydraulic oil is input into the When the oil chamber is 1-1, the hydraulic oil forms a large pressure in the oil chamber 1-1. Finally, due to the continuous input of hydraulic oil, the worktable is lifted up, resulting in a thin oil film between the oil pad and the rotary worktable. , The rotary table of the machine tool and the king-shaped oil pad 1 are in a complete fluid lubrication state. Usually, when the rotary table of the machine tool is subjected to high-speed and heavy loads, the thickness of the supporting oil film decreases, the heat generation increases, and the deformation of the table and the base 2 also increases, and the amount of oil thrown by the hydraulic oil increases. In severe cases, the oil pad 1 and the machine tool rotate The direct contact of the workbench forms dry friction, and then friction failure occurs. However, due to the relatively uniform and symmetrical distribution of the king-shaped oil pad 1 cavity structure, the force deformation of the oil film in the king-shaped cavity is small under the action of external loads. Therefore, when the oil pad 1 is under the pressure of the hydraulic oil, its circumferential oil rejection will be significantly reduced, and the deformation of the oil film will also be correspondingly reduced, which greatly reduces the static pressure loss and ensures that the thickness of the oil film is relatively stable. At the same time, the temperature rise of lubricating oil is reduced, which greatly reduces the power loss due to frictional resistance, improves the operating efficiency of the bearing, improves the phenomenon of large oil film heating and insufficient carrying capacity during processing, and improves processing accuracy.

Claims (1)

1. King-shaped cavity static pressure bearing oil pad, characterized in that: the main body of the oil pad (1), the main body (1) of the oil pad is fan-shaped, and there is a king-shaped oil chamber (1-1) inside it, and the king-shaped Two oil inlet holes (1-2) and (1-3) are processed on the end surface of the oil chamber (1-1); The main feature of the king-shaped cavity static pressure bearing oil pad is a fan-shaped body, with a king-shaped oil cavity in the middle, in which the area of the oil cavity accounts for 60% of the entire oil pad area, the total thickness of the oil pad is 20mm, and the depth of the oil cavity is 9mm, there are two oil inlets in the oil chamber, which is convenient for hydraulic oil to enter the oil inlets.