Die casting is a metal casting process that involves forcing molten metal under high pressure into a mould cavity. The mould cavity, also known as a die, is typically made of hardened steel and is custom-designed to produce the desired shape of the final product. alloy die casting,gravity die casting,gravity casting,high pressure die casting,pressure die casting Taiyuan Simis Investment Casting Co., Ltd , https://www.precision-casting.bizCommon Terms and Definitions of Rolling Bearings: Scale Related to Public Service
Rolling bearings are essential mechanical components used in a wide range of industrial applications. Understanding the terminology associated with these bearings is crucial for engineers, technicians, and anyone involved in machinery maintenance or design. Below are some key definitions related to rolling bearings and their dimensions.
1. **Nominal Inner Diameter (Outer Diameter)**
The diameter of the theoretical cylindrical outer surface of the bearing. For conical bearings, it refers to the diameter in a specified radial plane. For spherical bearings, it is the diameter of the theoretical envelope of the outer spherical surface.
2. **Nominal Width of the Ring**
The distance between the two theoretical end faces of the bearing ring. It serves as a reference for measuring width tolerances.
3. **Nominal Width (Height) of the Bearing**
The spacing between the two theoretical end faces of the bearing ring. This dimension is used to define the width (or height) of the bearing and is critical for radial or thrust bearings.
4. **Actual Width of the Bearing**
The axial distance between the two planes that limit the width of the bearing. This is measured from the end faces of the inner and outer rings.
5. **Actual Height of the Bearing**
The axial distance between the axis of the thrust bearing and the washer that limits its height.
6. **Actual Height Deviation**
The difference between the actual height of the thrust bearing and its nominal height.
7. **Nominal Chamfer Dimension**
A reference dimension used to describe the size of a chamfer on a bearing component.
8. **Radial Single Chamfer Dimension**
The distance from the sharp edge to the intersection of the chamfered surface and the end face of the ring or washer, measured in a single axial plane.
9. **Axial Single Chamfer Dimension**
The distance from the sharp edge to the intersection of the chamfered surface with the inner hole or outer surface of the ring or washer, measured in a single axial plane.
10. **Maximum Permissible Single Chamfer Dimension**
The maximum allowable radial or axial chamfer dimension for a given bearing.
11. **Nominal Ball Diameter**
A standard value used to identify the size of a ball in a bearing.
12. **Single Ball Diameter**
The distance between two parallel planes tangent to the actual surface of the ball.
13. **Mean Ball Diameter**
The average of the maximum and minimum single ball diameters.
14. **Ball Diameter Variation**
The difference between the maximum and minimum single ball diameters.
15. **Ball Lot**
A group of balls manufactured under similar conditions and considered as a single unit.
16. **Ball Grade**
A classification based on the ball's size, shape, surface finish, and dimensional tolerance.
17. **Ball Gauge**
A small deviation from the nominal diameter of the ball, determined by a standardized series.
18. **Ball Subgauge**
The closest value in a given series to the ball gauge.
19. **Nominal Roller Diameter**
The diameter of the roller, typically defined in a radial plane passing through the center of the roller for symmetrical rollers, or at the largest point for asymmetrical ones.
20. **Single Roller Diameter**
The distance between two parallel lines tangent to the roller’s surface in a plane perpendicular to its axis.
21. **Nominal Roller Length**
The length of the roller, used as a reference for manufacturing and measurement.
22. **Actual Roller Length**
The distance between two radial planes that fully contain the roller.
23. **Roller Gauge**
A measure of the uniformity of the roller’s diameter, considering deviations from the nominal size.
24. **Roller Grade**
A classification based on the roller’s diameter, shape, and dimensional accuracy.
25. **Roundness Deviation**
The difference between the largest and smallest radii of a circular cross-section.
26. **Cylindricity Error**
The difference between the largest and smallest radii of a cylindrical surface.
27. **Sphericity Error**
The difference between the maximum and minimum radii of a spherical surface.
28. **Radial Runout of the Inner Ring**
The variation in the radial position of the inner ring when rotated. It measures how much the ring wobbles relative to a fixed point.
29. **Radial Runout of the Outer Ring**
Similar to the inner ring, but measured on the outer ring instead.
30. **Radial Clearance**
The internal clearance between the inner and outer rings when no external load is applied.
31. **Theoretical Radial Clearance**
Calculated as the difference between the outer raceway diameter, inner raceway diameter, and twice the roller diameter.
32. **Axial Clearance**
The internal clearance along the axis of the bearing, important for thrust bearings.
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**Related Bearing Knowledge**
Understanding bearing performance involves analyzing factors such as spindle bearing oil, temperature control, and proper maintenance. Bearings can overheat due to improper lubrication, misalignment, or excessive load. Regular inspection, correct installation, and following manufacturer guidelines can help prevent failure and extend service life.
For more information on bearings, visit [China Bearing Network](http://www.chinabearing.net).
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The process begins with melting the metal, usually non-ferrous metals such as zinc, aluminum, magnesium, or copper alloys, in a furnace. Once the metal reaches the desired temperature, it is injected into the mold cavity at high pressure using a hydraulic or mechanical press.
The high pressure helps to quickly fill the mold cavity and ensures that the molten metal solidifies rapidly to produce precise and complex shapes with fine surface details. After the metal solidifies, the mold is opened, and the casting is ejected from the die.
Die casting is commonly used to produce a wide range of metal components and products with high dimensional accuracy, excellent surface finish, and tight tolerances. It is widely employed in industries such as automotive, aerospace, electronics, and consumer goods manufacturing.
Source: China Bearing Network | Time: 2013-02-06