How to calculate the axial force of thread transferred to handwh

1.

The conversion formula of torque and axial force is as follows:

conversion formula: n = EC · a [K (fi2-f02) + B (ti-t0)]

axial force * lead = motor output torque * 2 * 3.14 * lead screw efficiency (more than 90%)

Generally, the qualified spindle will not move axially

However, there is a static stiffness test in the process of spindle inspection, which is divided into axial static stiffness and radial static stiffness. Radial static stiffness is to apply a certain thrust in the radial direction, and then calculate a unit of N / & amp; mu; The value of is the inspection standard. Use a meter to point out the basic jump value of the front pry clearance of the end face. It is necessary to accurately measure the precision calibration error of the inspection panel, and the jump value of the static jump, that is, the axial displacement value

extended data:

mechanical components will proce a certain degree of torsional deformation under the action of torque, so torque is sometimes called torsional moment. Torque is the basic load form of transmission shaft of various working machinery, which is closely related to the working capacity, energy consumption, efficiency, operation life and safety performance of power machinery

The measurement of

torque is of great significance to the determination and control of transmission shaft load, the strength design of working parts of transmission system and the selection of prime mover capacity

2. LAN Shuo can, about 20.

3.

bus routes: Rail Transit Line 4

1. Take rail transit line 4 to qilimiao station

2. Walk about 770 meters to Hanyang District government service center of Wuhan City

< P > 2

4. When using ordinary threads, because the axial load is caused by the surface pressure of the incoming thread, and the elastic deformation control of the elastic deformable body is screwed in a staircase, the distribution of thread turns is uneven

5.

The screw speed can be calculated by the axial speed; The tangential force can be calculated by force analysis, and then the efficiency of screw drive can be calculated, and the power of input end can be calculated; The input speed can be calculated from the transmission ratio, and then the motor torque can be obtained

when the screw is matched with the main shaft of the gearbox with a long cylindrical surface, the screw can be used as a cantilever beam with one end fixed

The screw is usually scrapped e to long-term wear, too large gap between the screw and barrel, and can not be extruded normally, but there are also examples of failure e to improper design or operation of the working stress exceeding the strength limit. Therefore, the screw should also meet certain strength requirements

extended data:

for the case of floating connection between screw tail and recer main shaft, the bending stress caused by screw self weight is equal to zero e to screw floating in barrel, so it is only calculated according to screw compression stress and shear stress

because the bending stress caused by the dead weight of screw is very small (the screw is full of material around), even in the former case, it can be omitted, so the two methods are actually the same

6.

Thrust P = 2 πη T/L η: The screw transmission efficiency is about 0.9 ~ 0.95

ball screw is an ideal proct to convert rotary motion into linear motion or linear motion into rotary motion

ball screw is the most commonly used transmission element in tool machinery and precision machinery. Its main function is to convert rotary motion into linear motion, or torque into axial repeated force. At the same time, it has the characteristics of high precision, reversibility and high efficiency. Due to its small friction resistance, ball screw is widely used in various instrial equipment and precision instruments

The ball screw is composed of screw, nut, steel ball, prepreg, reverser and stproof device. Its function is to transform rotary motion into linear motion, which is the further extension and development of acme screw. The significance of this development is to change the bearing from sliding motion to rolling motion

7. Thread unfolding is an inclined plane, the external force is vertical to the inclined plane, and the axial force is parallel to the inclined plane, which is obtained by the decomposition of the vertical force.

8.

There are the following methods to eliminate the fit clearance between the screw and nut

1. axial adjustment method

2. using double nuts and springs to eliminate the drive clearance of the screw pair is simple and easy. When the screw is forward, it drives the nut and the carriage to move together. When the lead screw reverses, the auxiliary nut is pushed to make the carriage move reversely through the spring and nut. When assembling and adjusting, the compression state of the spring should be appropriate. Too much elastic force will increase the friction between the screw and the nut, and affect the flexibility and life of the transmission; The elastic force is small. When the auxiliary nut is pushed by the lead screw, the spring can not push the carriage and can not eliminate the clearance

   The outer surface of one end of the nut is conical, with three slots cut along the radial direction, and the neck wall thickness is thin, so as to ensure the elasticity of the nut ring radial contraction. There is a thread on the cylindrical surface at the bottom of the cone. The adjusting nut with a taper hole is used to fit with it to make the three claws of the nut press radially toward or away from the lead screw to eliminate the radial and axial clearance of the thread
   In order to obtain higher transmission stiffness of the ball screw feed system, in addition to strengthening the stiffness of the ball screw itself, the true installation of the ball screw and the stiffness of the support structure are also factors that can not be ignored
   A. It is equipped with thrust bearing at one end. This installation method uses short lead screw with small stroke, which has small bearing capacity and low axial stiffness
   There are thrust bearings at one end and radial ball bearings at the other end. This method is used in the case of long lead screw. When the hot deformation causes the lead screw to extend, one end of the lead screw is fixed, and the other end can be used as a trace of axial floating

3. C. thrust bearings are installed at both ends. When the thrust bearing is installed at both ends of the ball screw and preload is applied, the axial stiffness can be improved, and the screw only bears tension when it works. But this installation method is more sensitive to the thermal deformation of the lead screw

   It is equipped with thrust bearing and radial ball bearing at both ends. The two ends of the screw are double supported and preloaded to make the screw more rigid. In this way, the deformation of the lead screw can be transformed into the preload of the thrust bearing

4. lubricant can also be used for ball screw pair to improve wear resistance and transmission efficiency. Like other transmission elements of rolling friction, ball screw pair should avoid hard st or chip dirt, so it has protective device< br />

9.

Unable to calculate, no standard value. The relationship between torque and clamping force needs to know the friction coefficient and contact area between thread pair and thread, workpiece surface, etc

aiming at the minimum size and the unloading force reaching 80% of the flywheel gravity (1kn), a new type of axial unloading magnetic bearing is designed by combining the magnetic circuit estimation and finite element actuarial calculation

The pre tightening force of

threaded fasteners is mostly achieved by means of torque or angle

extended data:

the motor is directly connected with the high-speed centrifugal blower, and the gearbox is omitted - this idea is basically wrong and unlikely to be realized. For the traditional motor, it is difficult to achieve such a high fan speed without gearbox speed increase

in the use of threaded fasteners, the bolt nut connection pair is widely used, and the connection mode with pre tightening force is widely used. The pre tightening force connection can improve the reliability, anti loosening ability and fatigue strength of the bolt connection, and can enhance the tightness and stiffness of the threaded connection

in the connection of threaded fasteners, when there is no or insufficient pre tightening force, it can not play a real connection role, which is generally called under tightening; But too high pre tightening force or inevitable over tightening will also lead to the failure of threaded connection

It is well known that the reliability of screw connection is designed and judged by the preload, but it is not easy to measure directly in the assembly site except in the laboratory

10. The torque of screw t = f · Tan (thread rise angle + equivalent friction angle) · D / 2
where the thread rise angle = arctan (NP / 3.14 · d); N is rotational speed, P is lead,
D is pitch diameter of thread,
equivalent friction angle = arctan FV; FV is the equivalent friction factor of thread pair
these formulas can be found in the mechanical design manual