CNC machined inch cone pipe thread, inch pipe thread has no taper

The root is the same as the ordinary one, can you make the ordinary one, g00 x50 z100g00 z1

g92 x51 z-20 e14

g01 f300

g92 z-20 e14

g01 x49 f300

g92 x50 z-20 e14

M02 The number is scribbled, the taper is 1:16, you calculate the size of the head, the tail is the default of the system, I used the GSK928 car once.

G92 Z-20 R (if the external thread is the value of the outer diameter of the outer diameter, if the internal thread is the value).

Inspection system for inch threads:

1. The automatic detection system of thread parameters of the hardware system is based on PC architecture, which is mainly composed of lighting system, CCD camera and optical path imaging system, image acquisition card, image processing system, mechanical detection system and electronic control system.

During the measurement, after being illuminated by the lighting system, the thread image of the fastener is collected by the CCD camera and the optical path imaging system, and then the digital image is transmitted to the computer through the image acquisition card, and the computer processes the digital image according to the corresponding algorithm, calculates the parameters such as the tooth profile, pitch and middle diameter of the thread, and compares it with the standard to calculate the deviation.

2. The software system of automatic detection of thread parameters of the software system mainly includes the system control module, image processing module, etc.

System Control Module: Initialization; Complete the initial configuration of the system image interface card and standard parameters. image manipulation; Collect and save 8-bit gray images, and capture images to memory.

Image processing module: The image processing module includes an image preprocessing algorithm that reduces noise and highlights the edge information of the thread contour, an edge detection and extraction algorithm that detects and extracts the edge information of the contour, a system calibration algorithm that measures the actual size of the digital image, and an algorithm for calculating the thread parameters.

Measurement method for inch threads:

1. Measurement of thread angle.

The thread angle is also called the tooth angle. The measurement of the thread angle can be achieved by measuring the side angle, which is the angle between the side of the thread and the perpendicular face of the thread axis. The approximate contour of the thread teeth is sampled in the straight line segments on both sides of the thread, and the linear least squares fitting is performed on the sampling points.

2. Measurement of pitch.

Pitch is the distance between a point on a thread and the corresponding point on an adjacent thread. The measurement must be parallel to the thread axis.

3. Measurement of the middle diameter of the thread.

The thread diameter is the distance along the center diameter line perpendicular to the axis, and the center diameter line is an imaginary line.

Measurement results of inch threads:

Using machine vision technology, an automatic detection system for thread parameter measurement is designed, and parameters such as thread angle, pitch and middle diameter of standard thread specimens are measured. The measurement results show that the thread parameters are within the specified error range. Due to the high efficiency and reliability of visual inspection, it was considered that it could be used in production practice after further investigation.

On the profile that passes through the axis of the screw thread, the profile shape of the thread is called the tooth profile. The angle between two adjacent flanks is called the tooth angle. The tooth profile of the commonly used common thread is triangular, and the tooth profile angle is 60°.

You can check the "Mechanical Design Manual", "Mechanical Engineering Manual" or national standards:

There are two kinds of pipe threads in inch size: the profile angle of the American pipe thread is 60 degrees, and the profile angle of the inch pipe thread is 55 degrees, which is easy to confuse, and some specifications can be universal, but some specifications are not universal.

Before 1987, China's pipe threads were divided into two types: cylindrical pipe threads (G) and conical pipe threads (ZG), and this standard was scrapped after joining the World Organization for Standardization. The standard for pipe threads has been reformulated, that is, R is used as the code name for pipe threads in the new standard, and R is the general name for inch sealed pipe threads.

There are four types of R series threads: RP (cylindrical internal thread), RC (conical internal thread), R1 (conical external thread used with cylindrical internal thread), R2 (conical external thread used with conical internal thread). This is because European countries use the threaded fit of the inner cone of the outer column, while the countries outside Europe use the threaded fit of the inner cone of the outer cone, which is caused by history.

Please refer to the national standard for the size of the thread base surface of the inch taper pipe

GB T 55° Seal Pipe Thread Cylindrical Female Thread and Conical External Thread".

GB T Seal Pipe Thread Conical Female Thread and Conical External Thread".

GB T 7307-2001 55° Unsealed Pipe Thread》This standard is a cylindrical pipe thread.

There is no taper for inch pipe threads, and there is no taper for the female threads of ball valve DG15-G1 2. Inch threads with taper are denoted by r for the outer cone and rc for the inner cone.

1. Remove the screw rod of the middle carriage and change it to an elastic element (such as a spring) to control the front and rear sliding of the middle carriage. 2. Install a backer with a taper, the angle of the backer is the same as the thread taper, parallel to the large carriage, and the middle carriage controls the advance and retreat through the backing. 3. Adjust the small carriage to the position perpendicular to the large carriage and parallel to the middle carriage, and adjust the amount of knives through the small carriage when threading.

There is also a kind of taper pipe thread: dry sealing thread, that is, it can be sealed without any filler, directly tightened. There are two main reasons for its sealing properties:

1.Due to the taper, this type of thread has a "self-tightening effect" when mated with the same tapered or cylindrical thread; 2.Its special tooth shape design has a "perfect fit" characteristic (unlike ordinary metric threads, where there is a gap between the top and the base of the tooth – the top is flat and the base is round).

In reality, due to many reasons such as processing accuracy, fillers are usually added, such as: raw material belt, hemp silk white paint, etc. A number of stress stresses that are common to cause a "dry seal" may include:

Tooth shape accuracy (such as angle) is not enough (anastomosis), the end face is not perpendicular enough (refers to the matching cylindrical pipe thread) inch taper pipe thread comparison table.

The left end face of the workpiece thread is zero point; Shirt sedan chair.

g0x55.

z5.The start of the thread cycle.

g92x30

g0x200

Z20r value: 1:12=x: (50-30).

r=x 2 endpoint x

Be. Thread bottom diameter = thread tremor width nominal diameter pitch.