What are the hexagon bolt disassembly and protective measures?

There are many places where hexagon bolts are used to fix parts on machinery and equipment, but due to frequent disassembly, the hexagon corners of the bolts are easy to grind round, and there is slippage at this time, and it is difficult to remove them with a hexagon wrench. Here is an introduction to the body method of the hexagon bolt parts of the two-hexagonal nut, which can take out the bolt without harming the parts.

For the connection that the head of the hexagon bolt is slightly higher than or one flat in the plane of the fixed part, a hexagonal nut that is slightly smaller than the outer diameter of the head of the hexagon bolt can be placed on the hexagon bolt head, and then the nut and the hexagon bolt head are spot welded together, and the hexagon bolt can be taken out by screwing the nut with a movable hand after cooling.

Generally, threaded connections are self-locking, and will not loosen themselves when connecting stationary objects and operating temperature changes little. However, in the event of shock, vibration or variable loads, as well as large changes in operating temperature, this connection may loosen, affect the operation, and even cause accidents. In order to ensure the safety and reliability of the connection, effective anti-loosening measures must be taken for the threaded connection when installing the bolts.

Generally, there are three types of commonly used anti-loosening measures: mechanical anti-loosening, increasing friction and non-detachable.

1) The use of various stopper parts to prevent the relative rotation of threaded parts to achieve anti-loosening, this technology is called mechanical anti-loosening, more reliable, so there are many applications. Commonly used mechanical anti-loosening measures include cotter pins and groove nuts, check washers and round nuts, stop washers and nuts, Shenlian steel wires, etc.

2) Increase the friction by installing a spring washer and using a double nut. This anti-loosening technology prevents the tightened threads from losing pressure due to changes in external loads, so there is always frictional resistance to prevent the connection from loosening.

3) Fix the nut on the bolt or the connected part by using positioning welding, spot riveting and other methods, or fix the screw on the connected part to achieve the purpose of anti-loosening, and this anti-loosening measure is irremoparable.

Through the above description, we can understand the simple disassembly and simple reinforcement of hexagon bolts, so that we can be handy when we contact hexagon bolts in the future, and we don't have to worry about the removal and reinforcement of hexagon bolts.

<> "Screws play a very critical role in fixing and connecting in life, there are many types of screws, among which hexagonal screws are one of them, so what tools are used to screw hexagonal screws, let's take a look."

What tool to use to tighten hexagonal screws.

Usually use a hexagonal special screwdriver, hexagonal screws are divided into inner and outer hexagonal screws, depending on the style of hexagonal screws, if not, you can also use a mechanical wrench or vice to remove hexagonal screws, if you don't have these tools, you can also use other tools at home, such as using a butter knife, first insert the end of the knife into the screw slot, rotate counterclockwise, and then unscrew the screw. Or use an old CD, insert it into the screw slot and rotate it counterclockwise, and the screw can be unscrewed. But this method is suitable for use when the screws are not very tight.

What are the types of screws?

1. Ordinary slotted screws.

Most of these screws are used to join smaller parts. Generally, there are flat heads, cylindrical heads, countersunk heads, etc., and the strength of flat head screws and hexagon socket screw heads is relatively high, and they are connected with general parts. The head of the countersunk screw will be curved.

Countersunk screws are generally used in precision machinery or instruments.

2. Hexagon screws and hexagon screws.

The head of such a screw can be embedded in the component, higher torque can be applied, the connection force will be higher, and it can replace hex bolts. Generally, it is used for joints that require a compact appearance and a flat structure.

3. Ordinary Phillips groove screws.

The function is similar to that of ordinary slotted screws, and they can even be replaced with each other, but ordinary Phillips slot screws have higher strength in the slot, are not easy to bald, and will have a more beautiful appearance. When using, use the corresponding Phillips screwdriver for loading and unloading.

4. an eyebolt.

An eye bolt is a hardware attachment that is used to support a load during installation and transportation. When using, the screws should be screwed in the position where the support surface is close together, and should not be tightened with tools. At the same time, it is not allowed to have a load perpendicular to the plane of the eyebolt acting on it.

The anti-loosening method of hexagon bolt is very important, and the method can be selected correctly and applied to practice in order to play the greatest role, which is the most advantageous tool. Zhongda Consulting will briefly introduce the anti-loosening method of hexagon bolts for everyone's stool.

Why should hexagonal bolts be anti-loosening, it is for better, more permanent and more useful things. So, what are the anti-loosening methods for hexagonal bolt connections? Here are 5 types of introductions, the first one:

friction anti-loosening method; Second: mechanical anti-loosening method; Third: permanent anti-loosening method; Fourth:

riveting anti-loosening method; Fifth: structural anti-loosening method.

Friction anti-loosening. This is one of the most widely used anti-loosening methods, this method breeds a positive pressure between the thread pairs that does not follow the external force, so as to breed and produce a friction force that can restrain the relative rotation of the thread pair. This positive pressure can be achieved by pressing the threaded pair axially or simultaneously in both directions.

Such as elastic washers, double nuts, coarse sock self-locking nuts and nylon insert lock nuts. This anti-loosening method is more convenient to deal with the disassembly of the nut, but in the environment of blow, vibration and variable load, the bolt will cause the preload to fall due to relaxation at the beginning, and with the growth of the number of vibrations, the loss of preload will increase obtusely, and eventually will lead to the loosening of the nut and the failure of the threaded connection.

Mechanical anti-loosening. Use cotter pins, stop gaskets and string wire ropes, etc. The method of mechanical anti-loosening is more reliable, and the method of mechanical anti-loosening should be used to deal with important connections.

Permanently anti-loosening. Spot welding, riveting, gluing, etc. This method mostly crushes the threaded fasteners during disassembly, and cannot be reused.

Riveting anti-loosening. After tightening, the punch point, welding, bonding and other methods are adopted, so that the thread pair loses the characteristics of the active pair and the connection becomes a non-disabling connection. The disadvantage of this method is that the bolt rod can only be used once, and it is very difficult to disassemble, and the bolt pair must be crushed before it can be disassembled.

The structure is anti-loosening. The structural anti-loosening does not rely on manpower outside the circle, but only on its own structure. The structural anti-loosening method, that is, the Down's thread anti-loosening method, is also the best anti-loosening method that has started to progress and results now, but it is not known to most people.

Spring gasket anti-loosening.

The spring washer material is spring steel, and the washer is flattened after assembly, and its best force can keep the compression force and friction between the threads, so as to achieve anti-loosening.

Anti-loosening of the top nut.

The nut is used to make the bolt type subject to additional tension and friction. Due to the use of an extra nut and the fact that the work is not very reliable, it has been used less and less.

Self-locking nut anti-loosening.

One end of the nut is made into a non-circular closure or a radial closure after the seam. When the nut is tightened, the closure expands, and the elastic force of the closure is used to compress the screwing threads. This kind of anti-loosening structure is simple, anti-loosening reliable, and can be disassembled and assembled many times without reducing the anti-loosening performance.

The elastic ring nut is anti-loosening.

Fibers or nylon are embedded in the thread inserts to increase friction. The elastic ring also acts to prevent liquid leakage.

2) Mechanical anti-loosening.

Groove nuts and cotter pins are anti-loosening.

After the groove nut is tightened, use a cotter pin to pass through the small hole of the bolt tail and the groove of the nut, or you can use an ordinary nut to tighten it and drill the pin hole.

Round nuts and stop motion gaskets.

The inner tongue of the washer is embedded in the groove of the bolt (shaft), and one of the folds of the outer tongue of the washer is embedded in one of the grooves of the nut after tightening the nut.

After the stop gasket nut is tightened, bend the single or double ear stop washer to the side of the nut and the connected part respectively to achieve anti-loosening. If two bolts need to be double-interlocked, a double-lock spacer can be used.

Tandem steel wire anti-loosening.

Use a mild steel wire to penetrate the holes in the heads of each screw, and connect the screws in series to brake each other. This structure needs to pay attention to the direction of the wire penetration, 3) permanent anti-loosening.

Punching method to prevent loosening.

After the nut is tightened, the thread is damaged at the punch point at the end of the thread Adhesive anti-loosening is usually applied to the thread screwing surface with anaerobic adhesive, and the adhesive can be cured by itself after tightening the nut, and the anti-loosening effect is good.

There are a lot of bolts on the car, and you must follow the method when disassembling them, otherwise it will cause damage to the bolts or car parts. Let us refer to the removal and installation method of bolts. Bolt removal and installationWhen installing components with multiple bolts, following the following points can prevent damage and accidents (injuries) and also help us to complete maintenance work smoothly.

1.The loosening and tightening sequence follows the prescribed order, loosening and tightening the bolts evenly and slightly each time to prevent bending. (1) During the disassembly of rectangular parts (cylinder heads), loosen the bolts from the outside to the inside.

When installing, tighten the bolts from the inside out. (2) The cylindrical part (clutch housing) loosens and tightens the bolts slightly at once in the diagonal direction. (3) During the disassembly of the cover (bearing cover), loosen the bolts from the outside to the inside.

When installing the chain, tighten the bolts from the inside out. Note: Loosening the bolt on only one side will cause the bolt to deform and bend.

In addition to the above parts, there are some parts that are tightened and loosened in a special order. Please refer to the vehicle maintenance manual for this operation. 2.

Measures to prevent parts from falling off and many high-torque bolts are used when installing heavy components such as engine shafts. When disassembling and installing these parts, prevent them from falling. (1) When disassembling the variable speed drive axle, do not remove all the bolts at once, once the bolts are loose, they should be tightened temporarily.

2) The above method can prevent the transmission shaft from being removed or moved when the last bolt is loose. 3.Correct working method (1) When loosening the bolt, it is difficult to loosen the bolt smoothly if a heavy object acts on the bolt.

The support part can eliminate the force acting on the bolt of the royal car. No component weight acts on the bolt, and the bolt can easily loosen. (2) When installing multiple bolts, such as a cantilever beam, if only one side is fully tightened, it is difficult for the other bolts to align the bolt holes.

To prevent this from happening, it should be aligned as a whole, slightly tightened before being tightened at the end. 4.Precautions for Installing Bolts When tightening the bolts, it is necessary to check whether there is any liquid, such as water or oil, in the bolt holes.

If the bolts are tightened in this case, the hydraulic pressure becomes high, which damages the components. Use of bolt adhesive To prevent loosening, some bolts should be coated with adhesive. When reusing bolts, clean the bolts and apply locking glue.

In addition, some bolts are supplied with locking compound. Such bolts are called pre-painted bolts. When loosening bolts with locking glue, it is difficult at first, but once the glue fails, it is easy to loosen the bolts.

1.Cleaning (1) Clean the bolts with a wire brush, then blow off the excess adhesive with compressed air. (2) Use clean oil to remove the locking glue stuck to the bolt holes.

Just like cleaning bolts, blow off excess locking compound with compressed air at the end. Note: Tightening bolts without removing foreign objects can damage bolts and components.

When using this adhesive, the bolts should be tightened immediately. Since the bolts need to be tightened immediately after using the adhesive, the parts to be installed should be prepared in advance. There are several types of adhesives.

Follow the directions and use correctly.

1. The assembly of hexagon bolts is generally assembled with a live wrench, a torx wrench and an open wrench. The assembly efficiency of the wrench is low, but it is very versatile, and it is suitable for hexagon screws of various head specifications; The plum wrench has the highest efficiency, but it is not suitable for some occasions, a plum wrench has only 2 heads, and it can only be used on the hexagon screws of the two specifications of the head; An open-end wrench is similar to a torx wrench, but it can be used with an extended socket. The smaller the size of the hexagon screw, the higher the requirements for the edges and corners of the hexagon bolt, otherwise its head is easy to slip when subjected to (wrench) force.

In order to save materials, Wenzhou people invented the outer hexagonal cavity. The hexagon screws outside the recess are light in weight, the thickness of the head is thin, and it is easy to slip under the force, and the head may also be screwed off. View the original post

Use an open-ended wrench.

Screws are the main fasteners in mechanical equipment, open-end wrenches are important tools for processing, production and maintenance in the machinery industry.

1 Can work quickly, three to four times faster than traditional wrenches, and faster than fast wrenches.

2 One open-ended wrench can be used for 2-6 types of screws, while a double-ended wrench can only be used for 2 types of screws.

An open-end wrench is equivalent to 2-3 dull wrenches, which is equivalent to a movable wrench, but it can work quickly without adjusting the opening.

3 Long service life, can't be broken, and the front quick wrench is easy to break.

4. The manufacturing process is simple, and its cost is lower than that of a dull wrench.

5. Light weight, easy to carry, labor-saving.

For the connection where the head of the hexagon bolt is slightly higher than or one flat in the plane of the fixed parts, a hexagonal nut that is slightly smaller than the outer diameter of the hexagon bolt head can be placed on the hexagon bolt head, and then the nut and the hexagon bolt head are spot welded together, and the hexagon bolt can be taken out by screwing the nut with a movable hand after cooling.

Fifteen: torque wrench for high-strength bolt construction? The torque wrench used in the construction of high-strength bolts must be corrected before use, and its torque error shall not be greater than 5%.

The torque error of the torque wrench used for correction shall not be greater than 3%. It is not allowed to use ordinary wrenches or electric ordinary wrenches for construction. Sometimes the torque wrench will be damaged, and it is necessary to find it in time and replace it in time.

Torque wrenches that deviate too much from the torque value should not be used any longer.