https://nutszg.blog.shinobi.jp/ Mon, 01 Feb 2021 07:50:25 GMT ja © Ninja Tools Inc. The working principle of the lock nut is self-locking by the friction between the nut and the bolt. The reliability of this self-locking is reduced in dynamic loads. In some important occasions, we will take some anti-loosening measures to ensure the reliability of the nut locking.
There are also two types of lock nuts. One is to use two identical nuts to be screwed on the same bolt, and a tightening torque is added between the two nuts to make the bolt connection reliable. The other is a lock nut, which needs to be used with a lock washer. The special lock nut is not a hexagonal nut, but a middle round nut. There are 6 notches on the circumference of the nut. These six notches are not only the focus point of the tightening tool, but also the locking point of the lock washer. . The two anti-loose methods are more reliable than one, but the structure is relatively complicated.
When we all lock the lock nut, we all need to operate according to the locking method of the lock nut. The correct locking of this nut is what we all need.]]> jingujian https://nutszg.blog.shinobi.jp/jingujian/how%20to%20lock%20the%20square%20nut- Mon, 01 Feb 2021 07:50:25 GMT nutszg.blog.shinobi.jp://entry/11 The fixed base and hinge body are fixed and cannot be disassembled, which has better stability.
The quick-install and self-unloading base can be disassembled and installed independently, which has good convenience and speed, but the stability is slightly weaker.
There is also the latest three-dimensional debugging base, which is equipped with an adjusting screw, which can be adjusted left and right, which is more convenient than the general quick-install hydraulic hinge, and the stability performance is also improved.
The choice of hydraulic hinge is basically to observe from the aspects of surface technology, material thickness, hydraulic performance, and base. First determine the material, and then try whether the buffer performance is good, and then consider how to install it.]]> jingujian https://nutszg.blog.shinobi.jp/jingujian/the%20distinction%20of%20hydraul Wed, 27 Jan 2021 05:52:42 GMT nutszg.blog.shinobi.jp://entry/10 Reduce friction coefficient:
(1) Before use, check whether the thread is rough, whether there is iron filings or dirt between the threads, and make sure that the thread surface is clean and these things will often lead to lockup;
(2) Before use, you can use butter, molybdenum disulfide, mica, graphite or talc to lubricate the fasteners, and wax dipping is currently the most commonly used method;
Correct operation method:
(1) The screw must be perpendicular to the axis of the thread, and not inclined;
(2) During the tightening process, the force must be uniform, and the tightening torque must not exceed the safe torque;
(3) The speed and force of screwing in should be appropriate, not too fast or too big, use torque wrench or socket wrench as much as possible, and avoid using adjustable wrench or electric wrench;
(4) Avoid using under high temperature conditions, do not rotate fast when using, to avoid rapid rise in temperature and cause locking; (such as using electric wrenches, etc.)
(5) The use of washers can effectively prevent over-locking.]]> jingujian https://nutszg.blog.shinobi.jp/jingujian/how%20to%20install%20stainless%20s Wed, 13 Jan 2021 03:17:16 GMT nutszg.blog.shinobi.jp://entry/9 1. Select the product correctly: 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, which shall be subject to 1-2 pitches of the exposed nut after tightening.
2. Before use, check whether the thread is rough, whether there is iron filings or dirt between the threads, these things often cause lockup.
3. Lubricate the fasteners before use: it is recommended to use butter, molybdenum disulfide, mica, graphite or talc for lubrication. At present, wax dipping is commonly used for lubrication and anti-locking.
4. Pay attention to the method of use:
a. The speed and force of screwing in should be appropriate, not too fast or too big. Use torque wrench or socket wrench as much as possible, and avoid using adjustable wrench or electric wrench. Too fast will cause the temperature to rise rapidly and cause lockup. Import pump valve
b. In the direction of force, the nut must be screwed in perpendicular to the axis of the screw.
5. The use of washers can effectively prevent the problem of over-locking.
6. Locking or seizure often occurs on fasteners made of stainless steel, aluminum alloy and titanium alloy materials. These metal alloys themselves have anti-corrosion properties and will produce a thin oxide layer on the metal surface when the surface is damaged. To prevent further corrosion. When stainless steel fasteners are locked, the pressure and heat generated between the teeth will destroy this oxide layer, causing blockage or shearing between the metal threads, and then adhesion. When this phenomenon continues to occur, the stainless steel fasteners will be completely locked and can no longer be removed or continued to be locked. Usually this series of blocking, shearing, adhering, and locking actions takes only a few seconds, so the correct understanding of the use of such fasteners can prevent this phenomenon.]]> jingujian https://nutszg.blog.shinobi.jp/jingujian/preventive%20method%20of%20stain Mon, 04 Jan 2021 09:01:58 GMT nutszg.blog.shinobi.jp://entry/8 (2) The assembly position of the door hinge, door stop and handle of the service desk shall be specified by the designer. (3) For door locks, unless otherwise specified, the center of the lock handle should be lm away from the finished floor.
(3) All hardware assembly should strictly abide by the manufacturer’s instructions. When installing hardware, if you use wood screws to tighten, you should first use a wood drill to half the length of the screws themselves, and then screw the screws in In any case, do not use a mace to drive the screw directly.]]> jingujian https://nutszg.blog.shinobi.jp/jingujian/how%20to%20install%20hardware Tue, 29 Dec 2020 06:07:12 GMT nutszg.blog.shinobi.jp://entry/7 If the tightening torque is too small, the bolts are not pre-tightened enough and are easy to loosen.
If the tightening torque is too large, the bolt is subjected to excessive force, plastic deformation occurs, the length becomes longer, the thread diameter becomes smaller, and the thread engagement surface becomes smaller, making it easy to loosen.
The contact surface of the fastened part and the bolt or nut is too small or point or line contact. During the running of the vehicle, the contact surface of the part and the fastener rubs against each other, and a gap gradually appears between the two, and the thread pre-tightening force becomes smaller. Loose.
If the contact surfaces between multiple fastened parts are too small or point or line contact, the contact surfaces rub against each other during the driving process of the vehicle, a gap gradually appears between the two, and the thread pre-tightening force becomes smaller and loose.
Parts that are elastic or prone to plastic deformation will cause insufficient pre-tightening force of the fasteners and looseness after a period of tightening.
The lack of a loosening effect or a self-locking function of the bolt is also one of the reasons why the bolt is easy to loosen.
The design fastener does not match the strength of the part. If the strength of the part is too low, the bolt will deform the contact surface with the collar during the movement, and then loosen.]]> jingujian https://nutszg.blog.shinobi.jp/jingujian/summary%20of%20reasons%20for%20loo Mon, 21 Dec 2020 08:00:52 GMT nutszg.blog.shinobi.jp://entry/6 After selecting the wire, the screw fasteners should be headed first. There are many head types for screw fasteners, such as the commonly used countersunk, hexagonal, round, pan, cup, and flat heads. Generally, it is produced by single-mode machine, multi-mode machine, or clamping machine.
After the head shape of the screw fastener is formed, the thread must be threaded (threaded product). The screw of the polished rod is threaded into a circle of threads. There are also many kinds of thread, such as machine thread, self-tapping, triangular thread, etc., according to different product needs to produce different thread patterns.
The overall appearance of the screw fasteners is headed and the teeth are rubbed. Due to the needs of different users, the screw fasteners sometimes need to be surface treated or cleaned. At this time, electroplating equipment is needed.
After the screw fasteners are electroplated, the screw production steps have basically been completed, but a series of inspection steps are required before the screws are shipped. Salt spray testing machine, nail selection machine, etc.,
Packed and shipped according to different requirements of customers, such as how many screws in a pack, independent packaging or whole packaging. Is there a need for isolation between screws and screws?]]> jingujian https://nutszg.blog.shinobi.jp/jingujian/production%20steps%20of%20screw Mon, 14 Dec 2020 08:18:55 GMT nutszg.blog.shinobi.jp://entry/5 Fastener accelerated vibration test method (ISO standard or GJB715.3-89). The loading method and vibration and impact conditions of this method are closer to the actual use state of various fasteners. The second method cannot evaluate the anti-loosening performance of the loose connection of fasteners, while the first method can provide comparable evaluation results for the anti-loosening performance of various fastener loose connections. The threaded fastener connection in the working state may lose the pre-tightening force due to various reasons such as the wear of the supporting surface, the compression of the connected part, the overload yield of the bolt or the action of external load, and it may be tightened. The tight connection in the state becomes a loose connection with no pretension (or insufficient pretension). At this time, keeping the fastener itself locked so that it can be loosened within a certain period of time is very important to prevent the connected parts from failing due to separation.
Fastener transverse vibration test method (GB/T10431-1989). This method is to directly apply force to the bolt (or screw), so it can make the fastener connection loose in a shorter time, and the test efficiency is higher. Another feature of the second method is that it can accurately measure the variable of the pre-tightening force of the fastener connection during the vibration test, describe the change process of the pre-tightening force in the test, and give the pre-tightening force and the number of vibrations (or time) The relationship curve diagram, and the variable of the expected tightening force is used as the criterion to measure the looseness of the fastener connection. This is more intuitive and accurate than the first method, and easier to operate.]]> jingujian https://nutszg.blog.shinobi.jp/jingujian/how%20to%20evaluate%20the%20anti-l Sat, 12 Dec 2020 08:28:43 GMT nutszg.blog.shinobi.jp://entry/4 Nuts and other internal thread materials that do not have mechanical performance requirements or ISO Class 5-6 SAE Grade 3-4 generally use C1010 Q235A or C15. No heat treatment is required, and cold processing is sufficient. ISO Class 8, SAE Grade 5, generally use Ml35 SAE1035 DIN C35, small size nuts do not need heat to achieve the required mechanical properties, large sizes must be heat treated (quenching + tempering), this is GB3098.2 That is very clear. ISO Class 10 and SAE Grade 8 generally use medium carbon steel after heat treatment to meet its strength requirements. Medium carbon steel such as SAE1035. One thing everyone must pay attention to is that nuts and bolts are different. Their stress is mainly compression rather than extension. Therefore, the strength of the nut is not only related to the material, but also related to many factors, including accuracy, thread pitch, and nut chamfering. , Nut thickness
For bolts and other external thread materials that do not have mechanical performance requirements or ISO Class 4.8 SAE Grade 1-2 and other low-carbon steel fasteners, Q235A SAE 1015 DIN C15 is sufficient. No heat treatment is required at all, and it is directly cold processed. For higher fasteners such as ISO Class 6.8 SAE Grade 3-4, steel with a carbon content of more than 0.2% should be used, such as C1020 C1022 Ml20 ML35, etc. This type of screw does not require any heat treatment, and the cold working strength is complete. Can meet the requirements. In fact, the higher the carbon content, the more difficult it is to cold-form, and there is no need to use a grade 6.8 screw for overkill. Special circumstances are another matter. The most commonly used screws are ISO Class 8.8 SAE Grade 5. Medium carbon steel is generally used. ML35 SAE 1035 DIN 35 JIS SWRCH35K is heat treated (quenched + tempered), and SAE5140 40Cr, etc. can also be used. The increase in alloying elements will affect heat treatment. Hardenability is of great help, so you can choose to use alloy steel for screws with large specifications, so that the use of medium carbon steel will not cause the phenomenon of "impermeability" in the central part that we often say. ISO Class 9.8 10.9 SAE Grade 8 uses low-to-medium alloy steel materials, after heat treatment (quenching + tempering), the alloy material has a good combination of mechanical properties of the material, the commonly used material is 40Cr 35CrMo SAE5140 SCM435 SAE4135 SAE4137 JIS SCr440(H) DIN 41Cr4, etc. In fact, 45# can also achieve the required mechanical properties, but it is slightly inferior to alloy steel in terms of comprehensive mechanical properties. ISO Class12.9 SATM A574 is a high-strength bolt that requires high mechanical properties. It needs to be heat-treated (quenched + tempered) with medium carbon alloy steel, such as SCM435 35CrMo SAE 4137 SAE4135 DIN 34CrMo4. When the surface treatment has to go through the pickling process, hydrogen embrittlement will occur, so hydrogen removal must be done (especially for fasteners with sharp corners), otherwise the result will be very serious.
Other special requirements for materials If the company is to make fasteners for welding, arc welding and gas welding generally have no requirements for materials. If the customer uses spot welding, it must be done with low-carbon steel. If the strength must be increased, some low-carbon materials with higher Mn elements can be used. This is just a very simple example, many of which can only be noticed in actual production. When the customer specifies to use a certain grade of material, and the company does not have this material for a while, or this material is not easy to purchase in the market, you can learn about the purpose of the customer’s fasteners and meet the requirements of mechanical properties. Submit a written application requesting replacement materials. Some purchasing customers are not very professional in fasteners, and the choice of materials is not always the best. As our professional manufacturer of fasteners, we can give customers better suggestions to achieve both benefits. Of course, the fastener materials should pay attention to more than these. For example, the material must pass the aging period before using it (I wrote an article about this before). The rusty surface material is used to make some full-threaded fasteners or Used for fasteners that need to be ground on the surface, and the center of the material has shrinkage holes. Do not use to make polished head screws]]> jingujian https://nutszg.blog.shinobi.jp/jingujian/how%20to%20choose%20fastener%20materials Mon, 07 Dec 2020 07:25:45 GMT nutszg.blog.shinobi.jp://entry/3 bolt
Composition: a type of fastener consisting of two parts: head and screw (cylinder with external thread),
Necessary matching parts: need to be matched with the nut;
Due to fastening: used to fasten and connect two parts with through holes
Connection method: This type of connection is called bolt connection.
Disassembly performance: detachable connection.
Stud
Composition: There is no head, only a type of fastener with threads on both ends.
Necessary matching parts: nuts need to be screwed on;
For fastening: one end must be screwed into the part with internal threaded hole, and the other end must pass through the part with through hole
Connection method: This type of connection is called stud connection.
Disassembly performance: detachable connection.
Main application: Mainly used in the occasions where one of the connected parts has a large thickness, requires a compact structure, or is not suitable for bolt connection due to frequent disassembly
Screw:
Composition: A type of fasteners composed of two parts: head and screw,
Classification: According to the purpose, it can be divided into three categories: machine screws, set screws and special purpose screws.
1. Machine screws:
Used for fastening: mainly used for a fastening threaded hole part, and a fastening connection between a part with a through hole, (two through holes are also available)
Necessary leather fittings: no nuts required; (nuts required for through holes)
Disassembly performance: can be disassembled
2. Set screws are mainly used to fix the relative position between two parts.
3. Special purpose screws such as eyebolts are used for lifting parts
Nut
Composition: With internal threaded holes, the shape is generally flat hexagonal cylinder, but also flat square cylinder or flat cylinder, with bolts, studs or machine screws.
Connection method: used to fasten the connection of two parts to make them into a whole.

Self-tapping screws
Appearance: similar to machine screws, but the thread on the screw is a special thread for self-tapping screws.
Connection method: Used to fasten and connect two thin metal components to make them into a whole. Small holes need to be made on the components in advance. Because this kind of screw has high hardness, it can be directly screwed into the hole of the component. Responsive internal threads formed in the component
Wood screws:
Shape: It is also similar to machine screws, but the thread on the screw is a special wood screw thread.
Connection method: It can be directly screwed into the wooden component (or part) to fasten a metal (or non-metal) part with a through hole and a wooden component. This connection is also a detachable connection.
washer
Shape: A type of fastener with an oblate ring shape.
Connection method: placed between the supporting surface of the bolt, screw or nut and the surface of the connecting part,
Main function: It can increase the contact surface area of ​​the connected parts, reduce the pressure per unit area and protect the surface of the connected parts from damage; another type of elastic washer can also prevent the nut from loosening
rivet:
Composition: A type of fastener composed of two parts, a head and a nail rod, used to fasten and connect two parts (or components) with through holes to make them into a whole.
Connection: This connection is called rivet connection, or riveting for short. Belong to and non-detachable connection. Because to separate the two parts connected together, the rivets on the parts must be broken.]]> jingujian https://nutszg.blog.shinobi.jp/jingujian/fastener%20design%20specification Fri, 04 Dec 2020 02:50:30 GMT nutszg.blog.shinobi.jp://entry/2