Abstract Screw is a transmission structure that converts rotary motion into linear motion or converts linear motion into rotary motion. The typical screw consists of a screw, a nut and a ball.
Introduction Screw is a transmission structure that converts rotary motion into linear motion or converts linear motion into rotary motion. The typical screw consists of a screw, a nut and a ball. Its function is to convert rotational motion into linear motion, which is the further extension and development of ball screws. The significance of this development is to change the bearing from rolling motion to sliding motion. Due to the small frictional resistance, the screw is widely used in various industrial equipment and precision instruments.
Screw thread surface treatment: The surface treatment will increase the thickness. If the limit is exceeded, there will be problems with the fitting. Therefore, appropriate measures must be taken before surface treatment. The principle of surface treatment in North America is as follows: Except for the treatment layer with a large thickness of hot-dip zinc, the surface treatment must not violate the principle of basic thread coordination. Unless the buyer's special requirements, 2A thread can be adapted to surface treatment. In other words, the maximum diameter after surface treatment is the basic size, and the same requirements apply to 3A threads. If the 2A thread characteristic limit is still to be retained after surface treatment, symbol 2A should be replaced by 2AG. The so-called 2AG thread has the same characteristics as the 2A thread without surface treatment.
FEATURES The 1A thread has the same specification limits regardless of surface finish. There is no tolerance for the 3A thread and all internal threads. This means that the maximum diameter of the 1A, 2AG, 3A external thread and the minimum diameter of the 1B, 2B, 3B internal thread must be adjusted to the thickness of the surface treatment before surface treatment. When the thickness of the surface treatment exceeds its fit tolerance, its manufacturing tolerances must be adjusted, whether it is to adjust the limits of the external thread or the internal thread, and the external threads are permitted to violate their basic thread restrictions. In the 60 degree angle thread, the increase in screw belly and effective diameter is about 4 times the thickness of the surface treatment layer. The thickness of the surface treatment is usually expressed in terms of the lowest limit, regardless of the upper limit thereof, so in general, it is generally specified that the effective diameter change is 6 times the thickness. For example, if the surface of the 2A thread is treated with a thickness of 0.00015â€, then it will fit in a dimension of 0.0009†or more to accommodate the increased thickness. Usually after such processing, the manufacturing process will not cause problems. A more detailed treatment status for surface treatment is specified in ANSI/ASME B1.1 A-48.
When verifying the size acceptance status after surface treatment, the measuring tool used is the same as the non-surface treated measuring tool, but the 2A thread is not the same. After surface treatment, GO applies 3A ring gauge, NOGO applies 2A ring gauge, and there is also a The condition is a large thickness of surface treatment.
In the case of large-thickness surface treatment, the most common practice in the United States is to increase the bore diameter of the internal thread instead of reducing the external diameter of the external thread. This is because increasing the hole diameter or reducing the external diameter will reduce the thread bonding strength. The strength of the cap is matched with the strength of the bolt, so the aperture can be increased instead of reducing the outer diameter to avoid the loss of bond strength. The other reason is purely based on economic considerations.
Introduction Screw is a transmission structure that converts rotary motion into linear motion or converts linear motion into rotary motion. The typical screw consists of a screw, a nut and a ball. Its function is to convert rotational motion into linear motion, which is the further extension and development of ball screws. The significance of this development is to change the bearing from rolling motion to sliding motion. Due to the small frictional resistance, the screw is widely used in various industrial equipment and precision instruments.
Screw thread surface treatment: The surface treatment will increase the thickness. If the limit is exceeded, there will be problems with the fitting. Therefore, appropriate measures must be taken before surface treatment. The principle of surface treatment in North America is as follows: Except for the treatment layer with a large thickness of hot-dip zinc, the surface treatment must not violate the principle of basic thread coordination. Unless the buyer's special requirements, 2A thread can be adapted to surface treatment. In other words, the maximum diameter after surface treatment is the basic size, and the same requirements apply to 3A threads. If the 2A thread characteristic limit is still to be retained after surface treatment, symbol 2A should be replaced by 2AG. The so-called 2AG thread has the same characteristics as the 2A thread without surface treatment.
FEATURES The 1A thread has the same specification limits regardless of surface finish. There is no tolerance for the 3A thread and all internal threads. This means that the maximum diameter of the 1A, 2AG, 3A external thread and the minimum diameter of the 1B, 2B, 3B internal thread must be adjusted to the thickness of the surface treatment before surface treatment. When the thickness of the surface treatment exceeds its fit tolerance, its manufacturing tolerances must be adjusted, whether it is to adjust the limits of the external thread or the internal thread, and the external threads are permitted to violate their basic thread restrictions. In the 60 degree angle thread, the increase in screw belly and effective diameter is about 4 times the thickness of the surface treatment layer. The thickness of the surface treatment is usually expressed in terms of the lowest limit, regardless of the upper limit thereof, so in general, it is generally specified that the effective diameter change is 6 times the thickness. For example, if the surface of the 2A thread is treated with a thickness of 0.00015â€, then it will fit in a dimension of 0.0009†or more to accommodate the increased thickness. Usually after such processing, the manufacturing process will not cause problems. A more detailed treatment status for surface treatment is specified in ANSI/ASME B1.1 A-48.
When verifying the size acceptance status after surface treatment, the measuring tool used is the same as the non-surface treated measuring tool, but the 2A thread is not the same. After surface treatment, GO applies 3A ring gauge, NOGO applies 2A ring gauge, and there is also a The condition is a large thickness of surface treatment.
In the case of large-thickness surface treatment, the most common practice in the United States is to increase the bore diameter of the internal thread instead of reducing the external diameter of the external thread. This is because increasing the hole diameter or reducing the external diameter will reduce the thread bonding strength. The strength of the cap is matched with the strength of the bolt, so the aperture can be increased instead of reducing the outer diameter to avoid the loss of bond strength. The other reason is purely based on economic considerations.
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