How to lock with self tapping screws so that the cloth cover will not be rolled up?

With a self-tapping screw lock, you can adjust the distance of it a little looser, and when it is loosened, it will not be easily rolled into the cloth cover.

If you want to roll up the cloth cover with self-tapping screws, you can find something, find a stick or something, fix the fabric on the stick, and then roll it up again. You can roll this cloth up.

How to say that the cloth cover will not be rolled up with the implementation of the system? You can make an eye on the diamond first, and then use self-tapping screws to make it up, so that you can make up the set.

If you want the cloth cover to be rolled up, then you must fix one end first, so that it will be smoother.

How to use self-tapping screws to say that you will not roll up the sub-roll, I think you still have to find a professional specific screw, so that there will be a good result, and some screws are special, only such screws will not roll up the cloth cover.

For self-tapping screws, we can generally use a wrench, or some chess pieces, which can be made for him.

Then this one won't be.,It won't come in.,When this volume is because the light screw is a little different from his side, the net is from other places to enter.。

Try not to use self-tapping screws, self-tapping screws are not easy to use in many situations.

With self-tapping screws, it is possible to lock the rifle so that it will not be rolled up completely.

It seems to be like this, it still feels pretty good, very good.

When cutting knitted modal fabrics, the edge of the cloth is curled after cutting, and the two pieces are not good to match, please help see if there is any good way!

What about this screw, anyway? This one will roll up, no matter what? It's going to be like this, that's it.

We can also use the screws of the self-tapping tower to ask for a photo, and the cloth cover will not be rolled up, which is still more convenient for all of us.

How to use self-tapping screws so that the cloth cover will not be rolled up first, and then locked.

How do you lock the cloth sleeve with uterine screws so that you don't roll it up? I think it's normal to lock with uterine screws, so I won't roll up the condom.

It will crack, the plate has expansion, the correct method is 50% of the reaming screw.

Then you can open a little bit of hole, leaving a little space for thermal expansion and contraction, which will be safer, so that it will not crack, but at the same time, you should pay attention to waterproof measures. Ningbo Hezhong Liantuo is happy to answer for you.

No, but it is very difficult to attach other equipment to the drywall.

BAI as shown on the figure

is with self-tapping screws.

The self-tapping DU screw is a kind of screw with a drill bit, which is constructed by a special DAO power tool, and the internal drilling, tapping, fixing, and locking are completed at one time. Self-tapping screws are mainly used for the connection and fixing of some thinner plates, such as the connection between the color steel plate and the color steel plate, the connection between the color steel plate and the purlin, the wall beam, etc., and its penetration capacity is generally not more than 6mm, and the maximum is not more than 12mm. Self-tapping screws are often exposed to the outdoors and have strong corrosion resistance; Its rubber sealing ring can ensure that the screw is not waterproof and has good corrosion resistance.

Self-tapping screw meaning: the hole drilled is a hole that does not need to be tapped, the screw used is different from the general, the head is pointed, the tooth distance is relatively large, and the chipless tapping is a bit similar, you can screw it directly without tapping, metal and plastic usually use this method.

It can rely on its own thread on the material to be consolidated, and the corresponding thread will be "tapped, squeezed and pressed" by the consolidated body, so that it can be closely matched with each other.

There are a lot of locking screws on the stainless steel plate, I used to do shopping malls to package the escalator side bottom plate using the method of groove lock self-tapping screws, and the external buckle stainless steel strip, so that the screws are invisible, this shopping mall has been 18 years now, and there has been no falling phenomenon, (it must be a lock screw, otherwise there is a safety problem).

What do you mean by tightening? The drawings show self-tapping screws and locked them with a flasher.

Moreover, it is locked on a square steel pipe.

Just match the wire mother or weld the wire mother to the stainless steel plate

If the coefficient of friction is U, the inclination angle of the bolt is A

When u>tan a, no amount of force is exerted.

Because at this time, the phenomenon of friction self-locking occurs.

Usually, the material and nails will meet the needs of u>tan a.

So very few screws will be pulled outward.

It can only be wrung out with a screwdriver.

In the non-ideal state, it is necessary to consider the hardness of the material, the depth of the thread, etc., which is an empirical problem, and it is not easy to solve it in theory. . .

Due to its unique structure, the thread of the self-tapping screw is relatively sharp, and there is a 30-degree wedge-shaped bevel at the bottom of the thread, and when the bolts and nuts are tightened with each other, the tip of the bolt is tightly pressed against the wedge-shaped bevel of the Spike thread. The threads inside the hole are opened up by cutting and extruding, and the friction between the materials under the strong extrusion force is converted into self-locking ability.

Due to the change of the angle of the tooth shape, the normal force generated by the contact between the threads is at an angle of 60 degrees to the bolt axis, and the normal pressure is much greater than the fastening pressure, so the anti-loosening friction force generated is greatly increased.

The thread of the self-tapping locking screw is an ordinary thread of triangular cross-section, and the thread surface also has high hardness, so when connecting, the screw can also tap the internal thread in the thread bottom hole of the connected piece, so as to form a connection.

This kind of screw not only has the function of anti-loosening, but also can eliminate the procedure of pre-forming screw holes on the body, and is a new variety with excellent technology and economy.

The principle of self-locking lies in its unique structure.

As shown in Figure 1, there is a 30° wedge-shaped bevel at the bottom of the female thread, and the tip of the bolt is tightly pressed against the wedge-shaped surface of the self-locking thread when the bolt and the nut are tightened with each other, so as to produce a large locking force. Due to the change in the angle of the tooth shape, the normal force generated by the contact between the threads is at an angle of 60° to the bolt shaft, instead of a 30° angle as is the case with normal threads. Obviously, the normal pressure of the thread is much greater than the fastening pressure, so the resulting anti-loosening friction must be greatly increased.

When the bolt tension is also p0, the normal pressure of the traditional 60 ° angle thread p = , and the self-locking thread has a wedge-shaped bevel with an angle of 30 ° at the bottom of the tooth, the angle and magnitude of the normal pressure are changed, the normal pressure p = 2p0, the ratio of the normal pressure of the two is about 12 7 The anti-loosening friction of the self-locking thread increases accordingly.

The wedge-shaped surface of the self-locking thread can also remove the problems of uneven force and tripping and biting of ordinary threads.

The V-shaped thread ——— 60° angle of the common thread carries 70% of the load on its first and second thread meshing surfaces, while the subsequent meshing surfaces bear very little load. In this way, under the condition of working vibration load, the ordinary threaded fastener can easily overcome the locking force on the threaded contact surface and rotate, and then loosen, which is the reason why the ordinary threaded fastener is loose.

Figure 1 self-locking nut structure schematic.

Fig. 2 shows the stress state of ordinary threads and self-locking threads.

The self-tapping locking thread is the same as the metric thread, but the screw is not full circle, but resembles a triangle. The thread is hardened, and after extrusion, the material has a slight creep and is filled with a triangular one, which realizes self-locking. Therefore, when the hardness of the material is comparable to that of the self-tapping locking thread, the self-locking will fail.

The thread of the self-tapping screw is relatively sharp, and can be rotated into the smaller screw hole, and the thread in the hole is opened up by cutting and extruding, and the friction between the materials under the strong extrusion force is converted into self-locking ability.

Normal PC ABS alloy is relatively brittle, and the nozzle material will be added to the processing process of the injection molding plant, as long as you pay attention to the self-tapping screw after locking, there is no problem.

Stainless steel generally refers to steel that has the ability to resist the corrosion of air, water, acids, alkali salts or other media. Depending on the composition of the alloy, the focus is on stainless steel and acid resistance. Some steels are stainless but not necessarily acid-resistant, and acid-resistant steels are often rustless.

The main austenitic stainless steel used in the production of fasteners is austenitic stainless steel, and in people's daily life, the stainless steel often referred to is also austenitic stainless steel.

The stainless steel fasteners we use now are mainly made of austenitic and "low nickel" 201.

Stainless steel screw products mainly include: hexagon bolts, cylindrical head hexagon socket screws (cup head), hexagon socket concave end set screws (concave end machine meters), hexagon socket flat end set screws (flat end machine meters), hexagon socket tip set screws (tip machine meters), hexagon socket end set screws (column end machine meters), countersunk socket hexagon socket screws (flat cup), semi-round head socket hexagon screws (round cup), cross groove pan head machine screws, cross groove countersunk machine screws, cross groove large flat head machine screws, cross groove pan head self-tapping nails, Cross groove countersunk self-tapping nails, cross groove large flat head self-tapping nails, full thread rods (tooth strips), hexagon nuts, flange nuts, nylon nuts, cover nuts, wing nuts, flat washers, elastic washers, serrated washers, cotter pins, etc.

As a user, it is generally believed that it is best not to change the user's usage habits or design scheme to solve the stainless steel screw lock, otherwise it is not called a solution, it is called a concession. Regarding stainless steel screw locking, some manufacturers have some similar instructions or instruction guides attached to the product or handed over to the buyer when they leave the factory, and they will generally make some instructions and explanations:

1 Choose the right product. Before use, confirm whether the mechanical properties of the product can meet the requirements of use, such as the tensile strength of the screw and the guaranteed load of the nut. The length of the screw should be selected appropriately, and the distance between 1-2 teeth of the exposed nut after tightening shall prevail.

2 Before use, check the threads for roughness and for iron or dirt between the threads, which can often lead to locking.

3. Fasteners can be lubricated before use. It is recommended to use butter, molybdenum disulfide, mica, graphite or talcum powder for lubrication, and wax dipping treatment is commonly used for lubrication and anti-locking.

4 Pay attention to how to use it.

A The speed of precession should be appropriate, not too fast or too large, use a torque wrench or socket wrench as much as possible, and avoid using a movable wrench or electric wrench. Going too fast can cause the temperature to rise sharply and cause lockout.

b In the direction of force application, the nut must be screwed perpendicular to the axis of the screw.

5 The use of gaskets can effectively prevent the problem of over-locking.

Of course, different manufacturers have different technical instructions, and their content is similar to the above, and some also list the twist rejection of different specifications, which will not be listed one by one here. The main direction of its solution is to look at the user's use plan.

1. Keep the central axis of stainless steel screws and stainless steel nuts perpendicular to the locked surface to reduce the deflection angle.

2. Use a torque wrench or socket wrench as much as possible to avoid excessive force and control the torque within the safe torque range.

3. Try to use a manual wrench to slow down the locking speed, keep the thread clean, and use lubricating oil to reduce the coefficient of friction and reduce heat energy, thereby reducing adhesion.

4. Choose products with relatively high hardness to reduce the shearing of threads.

5. The use of stainless steel anti-locking agent has obvious effect on reducing the locking ratio.

Plate screws are standard parts used by fitters to make screws by hand, and their material is tungsten steel or alloy steel, which is very hard.

Iron plate tooth screw refers to the self-tapping screw directly used on the iron plate, no need to drill holes in the plate in advance, the tail of the screw is sharp and sharp, the whole screw should have a fairly high strength, in order to drill into the iron plate, the general material is made of chromium manganese and other alloy steel, and then heat treated.