What a fit! What is a fit The importance of a fit

Definition of <>cooperation":

1. Cooperate in the division of labor for a common task and act in a coordinated manner.

2. Closely related parts on machinery or instruments are combined.

synonyms: matching, mutual aid, solidarity, common, synergy, combination, collaboration.

Antonyms: to be a meme, to disturb, to disturb, to make things difficult.

1. This work needs to be completed by our mutual cooperation.

2. To complete this task, everyone needs to cooperate with each other and work together.

3. Due to their tacit cooperation, they won the championship in the double dance competition.

4. With the full cooperation of our military and civilians, the enemy's defense line completely collapsed.

5. In order to match the festive atmosphere, she specially placed a few pots of flowers indoors.

Explanation: 1. All aspects of the division of labor and cooperation to complete the common task.

For example, the two of them work well together in doubles.

2. Together, it looks appropriate and commensurate.

For example: the green branches and leaves set off the red and bright flowers, so cooperative, so beautiful.

3. The relationship between the combined borehole and the shaft tolerance zone with the same basic size. Determines the degree of tightness of the bond. The algebraic difference between the size of the hole and the size of the mating shaft is called clearance when it is positive, interference when it is negative, and interference when it is negative.

According to the relationship between the hole and the shaft tolerance zone, that is, the characteristics of clearance, interference and its variation, the fit can be divided into three situations: Gap fit. The tolerance zone of the hole is above the tolerance zone of the shaft and has a fit with clearance (including a minimum clearance equal to zero).

The function of the gap is to store lubricating oil, compensate for various errors, etc., and its size affects the relative motion of the hole and shaft. The clearance fit is mainly used for the movable connection between the hole and the shaft, such as the connection between the plain bearing and the shaft. Interference fit.

The tolerance zone of the bore is below the tolerance zone of the shaft and has a fit with interference (including a minimum interference equal to zero). In interference fitting, because the size of the shaft is larger than the size of the hole, it is necessary to use pressurization or thermal expansion and contraction methods for assembly. Interference fit is mainly used for fastening connections between bore shafts that do not allow relative movement, such as the connection between the ring gear and the hub of large gears.

Transition fits. The tolerance bands of the bore and shaft overlap each other and may have clearances or interference fits (which are generally small). The transition fit is mainly used for positioning connections that require good alignment and coaxiality between the bore shafts and are easy to disassemble and assemble, such as the connection between the inner diameter of the rolling bearing and the shaft.

The amount of variation in the allowable clearance or interference in the fit is called the fit tolerance. It is equal to the sum of the tolerances of the holes and shafts that fit each other, and indicates the allowable range of variation in the fit tightness.

Cooperate tacitly. The fit is seamless.

It refers to the division of labor and cooperation of all parties to complete a common task, or refers to the combination of appropriate and commensurate.

It's just that men and women work together without getting tired!

Definition of <>cooperation":

1. Cooperate in the division of labor for a common task and act in a coordinated manner.

2. Closely related parts on machinery or instruments are combined.

synonyms: matching, mutual aid, solidarity, common, synergy, combination, collaboration.

Antonyms: to be a meme, to disturb, to disturb, to make things difficult.

1. This work needs to be completed by our mutual cooperation.

2. To complete this task, everyone needs to cooperate with each other and work together.

3. Due to their tacit cooperation, they won the championship in the double dance competition.

4. With the full cooperation of our military and civilians, the enemy's defense line completely collapsed.

5. In order to match the festive atmosphere, she specially placed a few pots of flowers indoors.

Not only work, but also life and entertainment need to be coordinated.

Collaboration is when different people are together and do the same thing.

Reasonable division of labor, and finally achieve the desired goal.

Teamwork is when we are doing something.

The act of two or more people forming a team to accomplish this is cooperation

Match pèihé

Cooperate and act in concert for a common task.

Generally matched, suitable; Get married.

Closely related parts on machinery or instruments are combined.

Match pèihé

Cooperate and act in concert for a common task.

Generally matched, suitable; Get married.

Closely related parts on machinery or instruments are combined.

Coordination is very important, the cooperation between a tacit combination will be more perfect, the cooperation between the things is big and small, there is always a person in this world who can not complete the thing or can not be completed in a short time, then the cooperation can shorten the time and completion of their own work. Human beings are social animals, and the reason why they were able to survive and evolve from the harsh nature in ancient times also depends on the cooperation and division of labor between people. We are also at the moment, any work needs to be divided, and we need to cooperate with others in order to do better, that is, more people are stronger.

No matter how strong a single person's ability is, it can't compare to the cooperation of a collective.

The coordination system refers to a system in which holes and shafts with the same pole limit form a fit.

The coordination system refers to a system in which holes and shafts with the same pole limit form a fit.

That is, the matching benchmark system, there are base hole system and base shaft system, mixed fit, etc., the principle is as follows:

1.The common size range (below 500mm) is generally preferred. In this way, the number of processing tools and measuring tools can be reduced, which is more economical and reasonable.

2.The base shaft system is usually used in the following situations:

a.The tolerances of the fits used are not high (IT8 and below).

b.When the base hole system is selected, it will lead to a stepped shaft, which is not easy to assemble.

c.Parts of the same basic size need to be fitted with different parts.

3.When working with standard parts, the selection of the benchmark system generally depends on the standard.

4.In order to meet the special requirements of the fit, a mixed fit is allowed, such as M7 F7.

Coordination is very important, and a tacit combination will be more perfect, and there are big and small things to cooperate in this world, there is always something that one person can't complete or can't complete in a short time, then cooperation can shorten the time and completion of their own work, such as a long flood, the military brothers make a bridge by example, let the children cross the river, and if you fall into a pit, you need someone to cooperate with you, give you a rope to save you, even play games, cooperate with all aspects of your life and work, everywhere is happening.

The relationship between a hole and a shaft tolerance zone that is combined with each other of the same nominal size is called a fit. According to the difference between the size of the hole and the shaft, it is divided into: clearance fit, interference fit, and transition fit.

The provisions of the cooperation system are divided into: the base hole system and the base hole system. Base hole system:

The basic deviation is a system in which the tolerance zone of a certain hole forms various matings with the tolerance zone of the shaft with different basic deviations.

Base shaft system: The basic deviation is the tolerance zone of a certain shaft, and the tolerance zone of the hole with different basic deviation forms a system of various combinations.

The relationship between the bore and the shaft tolerance zone that are combined with each other with the same basic size is called a fit.

There is a gap fit; Interference fit. Transition fit, three categories.

The fit is matched, such as: hole and shaft, fit with interference, transition, clearance fit.

Transition fit, interference fit, gap fit.

The three types are machining accuracy standards that are set according to the use between the hole of the part and the shaft parts.

Press-fit a slender press-fit wire assembly, comprising: at least two slender, generally flat layered wires, the wires have corresponding, longitudinal edges adjacent to each other; an electrical insulating material layer placed between the two layered wires; and a plurality of press-fit contacts, extending from and along the adjacent longitudinal edges of the layered wires, to be inserted in their respective contact-accommodating areas with a press-fit.

1. Transition fit: Transition fit means that there may be a gap fit or an interference fit when the hole and shaft are assembled, and the tolerance zone of the hole and the tolerance zone of the shaft overlap with each other. The maximum limit size of the shaft is greater than the minimum limit size of the hole, the minimum limit size of the shaft is less than the maximum limit size of the hole, and the actual size of the shaft may be greater or less than the actual size of the hole.

2. Interference fit: In the process of mechanical installation, there are many parts that need to be closely matched to prevent the connection from falling off or transmitting large torque, so interference technology is produced. The interference fit is to use the elasticity of the material to expand and deform the hole and set it on the shaft, and when the hole is restored, the clamping force on the shaft is generated, so that the two parts are connected.

In the interference fit tolerance zone diagram, the tolerance zone of the hole is below the tolerance zone of the shaft.

Interference fit, that is, relying on the interference value of the shaft and the hole, after assembly, the elastic pressure between the surface of the part is generated, so as to obtain a fastened connection. Interference is when the difference between the size of the hole minus the size of the mated shaft is negative. The opposite of it is a gap fit.

An interference fit is a fit that has an interference, including a minimum interference equal to zero. At this point, the tolerance zone of the hole is below the tolerance zone of the shaft. The dimensions in each direction of the hole minus the dimensions in each direction of the mated shaft yields the algebraic difference, which is an interference fit when negative.

The structure is simple, coaxial, and can withstand large axial force, torque and dynamic load. However, the processing accuracy of the mating surface is required to be higher, and the assembly is inconvenient.

Let's take a cylinder and a piston as an example: if there is a gap between the piston and the cylinder after the piston is installed in the cylinder, it is called a clearance fit.

If the piston is loaded into the cylinder, there is no gap, and it is tightly sealed, which is called a transition fit.

If the piston cannot be installed into the cylinder (the diameter of the piston is larger than the cylinder), the method of heating the cylinder is used to forcibly load the piston, which is interference fit.

Transition fit: If both parts are made to tolerance, there may be gaps or interference, which is called transition fit.

The deviation of the transition fit hole intersects with the deviation of the shaft, and the maximum size of the interference fit hole (hole diameter + upper deviation) is less than the minimum size of the shaft.

The relationship between a bonded hole and a shaft tolerance zone of the same basic size is called a fit.

A mate with a clearance, including a minimum clearance equal to zero, is called a clearance fit.

A mate with an interference (including a minimum interference equal to zero) is called an interference fit.

Mates that may have gaps or interference are called transition mates.

An interference fit is a fit that has an interference, including a minimum interference equal to zero.

At this point, the tolerance zone of the hole is below the tolerance zone of the shaft. Interference fit is used for the fastening connection between the hole and the shaft, and does not allow relative movement between the two.

A gap fit is a fit that has a clearance, including a minimum clearance equal to zero.

At this point, the tolerance zone of the hole is above the tolerance zone of the shaft. That is, the difference between the size of the mated holes minus the size of the shaft is a positive value, and this difference is the clearance, which is usually expressed in s.

3.A transition fit is a fit that may have a gap or interference.

At this point, the tolerance zone of the hole overlaps the tolerance zone of the shaft. Transition fits are mainly used for centering joints between holes and shafts.

Clearance fit: The hole is larger than the shaft.

Interference fit: the shaft is larger than the bore.

Transition Fit: In between.

Complexes are coordination compounds. Ligand, which is a complex ion formed by combining a metal cation with a certain number of neutral molecules or anions with a coordination bond. Compounds composed of ligand ions and oppositely charged ions are called complexes.

For example: copper tetraaminophosphate, potassium mercury tetraiodide, etc. It can also be a neutral mating molecule formed by a simple metal ion (in a few cases, a neutral metal atom) and a certain number of anions or neutral molecules, such as dichlorodiaminoplatinum, tetracarbonyl nickel, etc.

The composition of the complex is explained using the example of zinc tetraammonia sulfate. The divalent zinc ion is called the central ion in the center, the four ammonia molecules are called ligands around it, the central ions and ligands form the inner boundary, and the sulfate ions are called the outer ions and the outer ions are called the external ions, and the inner and outer boundaries form complexes. The central ion generally provides valence electron empty orbitals, and the ligand is generally a molecule or anion that donates lone pairs of electrons, immediately around the central ion, and directly cooperates with the central ion with a coordination bond.

The ligand has lone pairs of electrons and directly combines with the central ion in the coordination bond is called the coordination atom, which is usually the atom of the electronegative element such as N, O, S, F, CL, etc., and is divided into single-tooth ligands, such as NH3, H2O, etc., and multi-tooth ligands, such as ethylenediamine. The charge carried by the external ions is just the opposite of the charge carried by the ligand ions, and the distance from the central ion is far away from the outer part of the complex. Because the level is insufficient, I have to answer like this, which may not meet your requirements, sorry!