Zhonghua Longchi mining

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2. Some netizens have encountered such a screw tightening, the spring pad will open, how to avoid, the details of the problem are: screw tightening, the spring pad will open, how to avoid, I search you through the Internet to collect some relevant solutions, hope to have the same or similar problems netizens to help, as follows:
solution 1:
you can refer to my answer
the functions of flat pad and spring pad are as follows
1. The function of spring washer is that after the nut is tightened, the spring washer gives the nut an elastic force to press against the nut, making it
not easy to fall off. The basic function of spring is to give a force to the nut after the nut is tightened to increase the friction between the nut and the bolt
2. Flat washer is generally used in connectors, one is soft, the other is hard and brittle, its main function is to increase the contact area, disperse the pressure and prevent the soft from crushing
the function of flat pad is:
1. Increase the contact area between screw and machine
2. Eliminate the damage of spring pad to machine surface when removing screw. When using, it must be:
spring pad a flat pad, the flat pad is next to the surface of the machine, and the spring pad is between the flat pad and the nut. The flat pad is to increase the force surface of screw. In order to prevent the screw from loosening, the spring pad plays a certain role in buffering and protecting under force
although flat pads can be used as sacrificial pads. But most of the time it is used as a supplementary pad or flat pad. The spring pad acts as a locking part. If the diameter value (s) of the hole and screw diameter of the workpiece is too large, it will not only damage the workpiece if the flat pad is not used or the spring pad is used directly,
the most important thing is that the screw can not only fix or connect the workpiece stably. Especially some high-strength parts. Therefore, when the value (s) is within the allowable range, the flat pad may not be used
may my answers help you
solution 2:
add a washer on the spring pad
solution 3:
What does it mean to open it
if the screw is tightened, the spring pad will open, how to avoid it
A: you can refer to my answer! The functions of flat washer and spring washer are as follows: 1. The function of spring washer is that after tightening the nut, the spring washer gives the nut an elastic force to tighten the nut so that it is not easy to fall off. The basic function of the spring is to give the nut a force after the nut is tightened to increase the friction between the nut and the bolt. 2. The flat washer is generally used in the connecting piece. How to place the flat washer and the spring washer when the screw is correctly put on the flat washer? A: the lower and upper washer of the bolt head: the spring washer - the flat washer. Note: the burr surface of the washer should be under, so as not to damage the R angle under the bolt head ring installation, which will affect the safety of the proct. When the nut is locked, put on the gasket: flat pad spring pad
why spring pad and flat pad are added when the bolt is fastening
A: the purpose of adding flat pad is to increase the contact area between the nut and the plane of the part. The purpose of adding spring pad is to prevent the nut from loosening on the bolt
why bolt is fastening things? Add spring pad and flat pad
A: spring pad is easy to scratch on the surface of the East and West It is often used in vibration occasions without spring pad, and the screw is easy to rust after aging. It can't open double nuts: it uses the friction force provided by locking between two nuts to prevent loosing, that is to say, it is the spring pad used to prevent loosing. After locking, it uses the elasticity of the spring pad to prevent loosing, which is of course more important

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please accept this answer, thank you!!

5. In the process of using the spring chuck, if it is used with high precision, it usually boring a tool first, so the precision of the chuck is the spindle precision. For the spring collet after quenching at the front end, as long as it is used reasonably, the life factor is not considered at all. The precision of corn tooth type and special-shaped spring collet is determined by the manufacturing precision of collet< Br > the spring chuck can be used to position and clamp the turning workpiece, as well as the cutter, grinding and milling workpiece or many other occasions. The external thread of the spindle rod of the machine tool is connected with the internal thread of the back end of the spring collet to proce the axial tension. Then the conical surface of the front end of the spindle, which is called the locking angle, converts the axial tension into a clamping force perpendicular to the center of the spring collet. In addition, the clamping force can be expanded by the locking angle. According to the calculation, the clamping force of the spring chuck can be expanded by 3-4 times according to different locking angles< However, there are many main factors that affect the clamping force. The understanding of the basic principle can help the workpiece (or tool) to clamp correctly and find the fault quickly. The following are the main factors that affect the clamping force and the summarized experience: < br > (1) axial force. The pull rod exerts an axial tension on the spring collet. In the use of the spring collet, the axial tension can be applied in different ways, but the action principle is basically the same. Therefore, a large axial tension will proce a large clamping force, and vice versa. Generally, the axial tension of the pull rod can be adjusted on the CNC machine tool< Br > (2) in the use of spring collet, the locking angle of collet will determine the radial clamping force provided by spring collet under the same axial tension, which is usually determined by machine tool manufacturer and spring collet manufacturer. The choice of locking angle should be based on the economy and reliability, according to the type of machine tool, use conditions (dynamic and static) and use (workpiece and tool)< Br > (3) the friction between the workpiece (or tool) and the spring chuck will directly affect the clamping firmness (but not the clamping force). The greater the friction, the firmer the workpiece clamping, and vice versa. In order to overcome the relative rotation or axial movement between the spring collet and the workpiece (or cutter), various measures can be taken in the manufacturing process of the spring collet, so as to improve the friction force, such as making serrated shape in the inner hole of the spring collet or impregnating cemented carbide microcrystalline particles on the clamping surface< Br > (4) friction between the spindle cone and the spring collet at the locking angle. The friction also directly affects the clamping force of the spring chuck on the workpiece. If the friction force is too small, the clamping force is not enough, the relative rotation of the workpiece will occur; Too much clamping force will accelerate the wear of spring chuck< Br > (5) in practical use, the spring collet should be loosened frequently to replace the workpiece. For example, when it is used in the turning center, a layer of lubricant can be sprayed on the surface of the inner hole of the spring collet when loosening. If conditions permit, the coolant lubrication is better, which can not only wash the debris on the spring collet, but also provide good lubrication effect. The long-term wear can be reced and the clamping force can be increased by regularly applying grease at the locking angle of the spring chuck. Other materials with better lubrication effect can also be used, including high-quality grease or wax based materials with EP (extreme pressure) characteristics< Br > (6) reasonable selection of the clamping diameter of the spring collet can ensure that the spring collet has the maximum clamping force on the workpiece, and achieve the best clamping state, so as to ensure the high quality and high precision of machining. If the diameter of the inner hole of the spring chuck is too large, the workpiece is only clamped by the hole of the spring chuck when the chuck is closed, which may cause the geometric mismatch between the outer circle of the workpiece and the inner hole of the spring chuck, thus recing the clamping force. If the diameter of the inner hole of the spring collet is too small, only the inner part of the inner hole of the collet contacts the workpiece when the collet is closed. In this way, although the clamping force increases, it will cause different axes between the collet and the workpiece. A spring collet of one size can only clamp and position the workpiece of corresponding diameter.

6. Er spring collet is composed of collet body, elastic collet inserted into collet body and a nut which can tighten thread on collet. When the nut is tightened, the elastic clamping barrel encircling the round handle can exert a strong clamping force on the handle. Compared with the side locking chuck, the spring chuck can achieve a longer tool life and higher feed rate, and improve the surface finish of the workpiece.

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8. 50N. M is the moment, its calculation formula is t = f * l, f is the force, l is the distance from the point of action to the center, that is, the arm of force

it means that you take a spanner to lock the bolt. If the spanner is 1 meter long, you need to use 50N force to lock it. Of course, there won't be a 1-meter-long spanner. Generally, a spanner is only about 20 centimeters (0.2m), so your locking force will be about 250N

for KGF, 1kf = 9.8N

9. I think what you want is the testing method of preloading torque

10. The release force should be smaller, and the locking force is generally about 1.5-2.5 times of the release force