202077(火)

China Fasteners Suppliers Teaches You To Get Rid Of Misunderstandings

Hexagon Socket Head Bolt外部リンク is a common Hexagon Socket Head Bolt connection part in our lives, ranging from small screws on watches to large mechanical parts or aircraft bolt and nut connections. The use range of Hexagon Socket Head Bolt is very extensive, but in the process of using it, will you encounter some misunderstandings, for example, if we don't have fine-tooth bolts, can we replace coarse-tooth bolts? When using Hexagon Socket Head Bolt, the common misunderstandings are mainly the following, I hope to help everyone.
What are the misunderstandings when using Hexagon Socket Head Bolt, how much do you know?

1. Use coarse teeth instead of fine teeth

There are many important connectors on the machine, such as the drive shaft, etc. Most of the bolts are fine-threaded. If parts are missing during maintenance, some maintenance personnel will use coarse-tooth bolts instead, which should be avoided.

Because the fine-diameter bolt has a large inner diameter, a small pitch and an external angle, high strength, good self-locking performance, and strong ability to withstand shock, vibration and exchange loads. Once replaced with coarse-tooth bolts, it is easy to loosen or disengage, disassemble, and even cause mechanical accidents.

2. Poor pores

The bolts on the machine that are subjected to lateral loads and shear forces, such as drive shaft bolts and flywheel bolts, have a transitional fit with the bolt holes. The assembly should be strong and reliable, and can withstand lateral forces. Someone did not pay attention to the inspection during the assembly process, and continued to install when there was a large gap between the bolt and the bolt hole, which was easy to loosen or cut off the bolt.

3. Thick nuts increase connection reliability

Some people mistakenly believe that thickening the nut can increase the number of working cycles of the thread and improve the reliability of the coupling. But in fact, the thicker the nut, the more uneven the load distribution among the threads of the circle, the easier the coupling is to loosen.

4. One mother and more pads

After the installation is completed, sometimes the bolts are too long, so some people will install additional spring washers on the bolts.In this case, the spring washers will be unevenly broken during the process of solidification, which will cause the bolts to be pre-prepared. Decreased tightening force may also produce eccentric loads, reducing the reliability of bolted connections.

5. The tighter the better, the better

Many staff members have the misunderstanding that they think that the bolts should be “tightened rather than loosened”, so they deliberately increased the tightening torque, which resulted in the bolt slipping. In addition, there are some important bolts that need to be tightened with torque, but some people use an adjustable wrench to save the trouble. As a result, the torque is insufficient, resulting in loose bolts and even causing mechanical failure.

6. The washer is too large

Sometimes a properly sized washer is missing, and some workers will replace it with a larger inner diameter washer.In this case, the contact area between the bolt head and the washer is small, which will reduce the bearing pressure or locking force of the washer. There is vibration and shock in it, and the bolt is easy to loosen.

7. Improper locking

Important bolts should be locked with anti-loosening devices after assembly. There are four cases to illustrate here. If cotter pins are used for locking, do not use too thin cotter locks or half-piece cotter locks for locks; if spring washers are used for locks, the gap of the gasket openings must not be too small; if lock plates are used for locks, the lock plates must not be locked at The corners of the nuts; if double nuts are used for locking, the thinner nuts must not be installed outside.

8. False and strong

If the bolts, nuts or threads of China Fasteners Suppliers外部リンク are rusted, or impurities such as scale, iron filings, etc., they must be cleaned before assembly; the joint surface of the coupling parts have burrs, sediment and other impurities should also be removed. Otherwise, when tightening the bolts, the surface seems to be tightened, but in fact the coupling is not really compressed. Under such false solidity, if the vibration, load shock and temperature change occur, the bolt will quickly loosen.



2020630(火)

China Custom Bolt Wholesaler Produces High-strength Products

The plastic index required by Hexagon Socket Head Bolt外部リンク, the higher the performance level, only the higher grade materials can achieve. The lower grade materials can only meet the strength requirements by reducing the tempering temperature, but they cannot meet the plasticity and toughness requirements. In the test, the brittle fracture was judged as unqualified. The steel structure bolt also stipulates the highest tensile strength, which is to ensure the plastic toughness of the bolt. According to the construction process, it is divided into torsion-shear type high-strength bolts and large hexagon high-strength bolts. The large hexagonal high-strength bolt belongs to the high-strength level of ordinary screws, while the torsional shear type high-strength bolt is an improved type of the large hexagonal high-strength bolt, for better construction. The construction of high-strength bolts must be first tightened and then finalized. The initial tightening of high-strength bolts requires impact-type electric wrenches or torque-adjustable electric wrenches; while the final tightening of high-strength bolts has strict requirements, the final twisting of high-strength bolts must use torsional shear Type electric wrench, torque type high-strength bolts must be used to finalize the torque type electric wrench. Ordinary bolts can be divided into three grades A, B, and C according to manufacturing accuracy. Grades A and B are refined bolts, and grade C is rough bolts. For connecting bolts for steel structures, unless otherwise specified, they are generally ordinary coarse grade C bolts. ①The bolts of class A and B bolts are processed by lathes with smooth surface and accurate size. The material performance level is 8.8. The production and installation are complicated and the price is relatively high. It is rarely used; ②C class bolts are made of unprocessed round steel The size of the material is not accurate enough, and the material performance level is 4.6 or 4.8. The deformation during shear connection is large, but the installation of China Custom Bolt Wholesaler外部リンク is convenient and the production cost is low. It is mostly used for temporary connection during tensile connection or installation.



2020623(火)

Introduction To The Use Of Hexagon Socket Head Bolt

The materials used for Hexagon Socket Head Bolt are different, and the hardness is also different. If the top surface of Hexagon Socket Head Bolt外部リンク is quenched, then when we choose Hexagon Socket Head Bolt, we must consider the shape of the screw.
The compression force of Hexagon Socket Head Bolt is the smallest of slotted screws and the largest of square head screws. The inner Hexagon Socket Head Bolt is centered. The cone-end screws are generally suitable for low-strength parts. Hexagon Socket Head Bolt is used to increase transmission. Load capacity.
Both flat-end screws and female-end screws are suitable for machines with high hardness or frequent position adjustment; long cylindrical end screws are suitable for tubular shafts to transmit large loads, but there should be a device to prevent the screws from loosening during use .
When we use the Hexagon Socket Head Bolt from weigao China Fasteners Suppliers外部リンク , we should use it according to the above method.



202069(火)

The Advantages Of Full Threaded Stud's Blackening Treatment

  China Fasteners外部リンク steel parts are blackened, and some are also called blue.
  The principle is to quickly oxidize the surface of steel products to form a dense oxide film protective layer.
  Blackening treatments are now commonly used by traditional alkaline heating blackening and later normal temperature blackening.
  Normal temperature blackening process is mainly completed by the following process steps:
1) Cleaning; 2) Degreasing: the workpiece must be completely immersed in the degreasing solution; the concentration of the degreasing solution is 12-14, the processing time is 10-30min, and it shakes up and down several times every 3-5 minutes. Degreased powder; 3) Water washing; 4) Pickling: pickling solution concentration ph value 2-4, processing time 5-10min; 5) water washing; 6) blackening: pool liquid concentration ph value 2.5-3.5, processing time 10- 12min; 7) Wash with water; 8) Blow dry; 9) Grease.
  Full Threaded Stud外部リンク's blackening process has the following advantages: 1. Blackening is safe without electricity, and alkaline high temperature blackening requires 100% electricity. 2. Improve work efficiency: it takes 1-2 minutes in total. 3. The blackening cost is low, the equipment is simple, and the operation is convenient; the blackening time is strictly controlled. 4. Strong process adaptability: solved the problem that nodular cast iron can not blacken. Blackened for wear resistance and rust prevention.



202062(火)

Introduction Of Hexagon Flange Bolt High Standards

Hexagon Flange Bolt外部リンク refers to the Hexagon Flange Bolt that does not need to correspond to the standard, that is, the Hexagon Flange Bolt without strict standard specifications. The manufacturing cost of the general non-standard Hexagon Flange Bolt is higher than the standard Hexagon Flange Bolt.
Hexagon Flange Bolt is different for each mold. The parts in contact with the product glue level on the mold are generally non-standard parts. The main ones are the front mold, the rear mold, and the insert. It can also be said that apart from screws, spouts, thimble, aprons, springs, and mold blanks, almost all are non-standard Hexagon Flange Bolt. If you want to purchase non-standard Hexagon Flange Bolt, you should generally provide design input such as technical specifications, drawings and drafts, and the supplier will evaluate the difficulty of achieving the non-standard Hexagon Flange Bolt and preliminary estimate the production of non-standard Hexagon Flange Bolt Cost, batch, production cycle, etc.
The big difference between Hexagon Flange Bolt and non-standard Hexagon Flange Bolt is whether there is standardization. Standard Hexagon Flange Bolt has strict standards set by the country in terms of structure, size, painting, marking and other aspects. Parts), common standard Threaded Rods And Eye Bolts外部リンク have threaded parts, keys, pins, rolling bearings and so on.



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