SC61 High End Stereo Microscope Sc61 High End Stereo Microscope ,Stereo Light Microscope,Stereo Binocular Microscope,Dissecting Microscopes Ningbo Beilun Kalinu Optoelectronic Technology Co.,Ltd , https://www.nbyxmicroscope.com
/*728*90 created on 2018/5/16*/ var cpro_id = "u3440131"; Home>Bearing knowledge>Common knowledge of fasteners and product touch specifications Product common sense of fasteners and product touch specifications
Fasteners are a class of mechanical parts used for fastening and are widely used. The characteristics of the fasteners: the variety of specifications are complex, the functions are different, and the degree of standardization, serialization, and generalization is extremely high. Therefore, some people have already referred to the type of fasteners that have been regulated by the state (professional) as tight. Firmware; referred to as the specification. /*250*250 was created on 2017/12/25*/ var cpro_id = 'u3171089';
Because each detailed fastener product specification, scale, public service, component, function, appearance, symbolic method; and inspection view, symbol and packaging, etc., detailed requirements; is separate from the regulations in several countries (occupation) In; for example, English, German, and American.
Fasteners are the most widely used mechanical basics. Followed by China’s participation in the WTO in 2001 and stepping into the ranks of world trade powers. Many fastener products exported to countries all over the world and all over the world are also pouring into China. The fasteners are one of the products of China's large import and export volume; complete the integration with the world; promote the Chinese fastener companies to the world; promote the fastener companies to participate in the world cooperation and competition; Meaning and strategic implications.
A fastener is a general term for fastening two or more parts (or components) into a type of mechanical part selected for the whole time. It is also called a specification part on the market.
It usually contains the following 12 types of parts:
1. Bolt: A type of fastener consisting of a head and a screw (a cylinder with external threads); it needs to cooperate with a nut; it is used to fasten two parts with through holes. This connection method is called Bolt joints. If the nut is unscrewed from the bolt; there is a way to separate the two parts; so the bolt connection is due to the detachable connection.
2. Stud: No head; only one type of fastener with external threads on both ends. When connected; one end must be screwed into the part with the internally threaded hole; the other end is passed through the through hole In the part; then screw the nut; even if the two parts are fastened together to see the whole. This connection is called stud connection; it is also due to the detachable connection. Firstly, the thickness of one of the connected parts is large, the demand The layout is compact; or because of the frequent opening; it is not suitable to use bolts.
3. Screw: It is also a kind of fastener consisting of two parts: the head and the screw; it can be divided into three categories according to the use: machine screws, set screws and special purpose screws. The machine screws are mainly used for one part of the fixed threaded hole; Fastening connection with a part with a through hole; no nut cooperation is required (this connection is called screw connection; also due to detachable connection, can also cooperate with the nut; for two with through holes The fastening between the parts.) The set screw is mainly used to fix the relative orientation between the two parts. Special use screws such as eyebolts for lifting parts.
4. Nut: with internally threaded hole; shape usually shows a flat hexagonal column; also has a flat square or flat cylindrical shape; cooperative bolt, stud or machine screw; used to fasten the two parts; make it One piece.
5. Self-tapping screws: similar to machine screws; but the threads on the screws are dedicated self-tapping screws. They are used to fasten two thin metal members; make them a whole piece; Because the screw has a high hardness; it can be screwed directly into the hole of the member; the internal thread that constitutes the echo in the member. This connection is also attributed to the detachable connection.
6. Wood screws: also similar to machine screws; however, the threads on the screw are ribs for special wood screws; they can be screwed directly into wooden components (or parts); used to place a metal (or non-metal) part with a through hole A wooden component is fastened together. This connection is also due to the ability to disengage.
7. Washer: a type of fastener with an oblate shape. It is placed between the support surface of the bolt, screw or nut and the outer surface of the joint; it increases the external and external surface of the contacted part; reduces the pressure per unit area and protects The effect of the appearance of the connected parts is not damaged, another type of elastic washer; can also play the role of hindering the nut back.
8. Retaining ring: It is installed in the shaft groove or hole of the machine or equipment; it plays the role of blocking the left and right parts of the shaft or the hole.
9. Pin: It is mainly used for part positioning; some can also be used for connecting parts, fixing parts, transmitting power or determining other fasteners.
10. Rivet: A type of fastener consisting of two parts, the head and the shank; used to fasten the parts (or components) that connect the two through holes; make it a piece of the whole. This connection is called rivet joint. Referred to as riveting. It is not connected with the unopening. Because it is necessary to separate the two parts that are connected together; it is necessary to damage the rivets on the parts.
11. Assembly and connection pair: The assembly refers to a type of fastener that is supplied in combination; if a certain machine screw (or bolt, self-supply screw) is combined with a flat washer (or a spring washer or a lock washer), the joint is attached. Refers to a type of fastener that supplies a combination of special bolts, nuts and washers; for example, a high-strength large hex head bolt for steel layout.
12. Solder Stud: A heterogeneous fastener consisting of light energy and a nail head (or no nail head); it is welded to a part (or component) by welding to allow it to engage with other parts.
Each fastener product touches the specification of several aspects:
1) Specification of fastener product dimensions: detailing the fundamental dimensions of the product, threaded products; also including the fundamental dimensions of the thread, thread finish, shoulder distance, undercut and chamfer, end of externally threaded parts Scale and other aspects.
2) Specification of the skill conditions of fastener products. The details include the following specifications:
a) Specification for the public service aspect of fastener products: detailing the contents of the public service and the public service of the product scale.
b) Specification of the mechanical function of the fastener product: detailed description of the symbolic method of the mechanical function level of the product and the mechanical function items and requirements. Some fastener products change this content to the product data function or the operation function. Aspect of the content.
c) Specification of the shortcomings of the fastener product appearance: detailing the shortcomings of the product appearance and detailed requirements.
d) Specifications for the appearance of fastener products: detailed provisions on the appearance of product appearance and detailed requirements.
e) Specification of experimental aspects of fastener products: detailed provisions on the experimental aspects of the above various functional requirements.
3) Specification of inspection, symbol and packaging of fastener products: detailing the sampling plan for the qualified quality level of the inspection items at the factory inspection; and the product symbol method and packaging requirements.
4) Specification of the fastener product symbol approach: detailing the product integrity symbol approach and the simplified symbol approach.
5) Other aspects of fasteners: such as the specification of fastener terms; the specification of fastener product components.
I will sum up all the common sense above; I think we must know more about fasteners; on the road to open up your work; there must be quantitative assistance. It is often said: know yourself and know each other; If it is a person who does not know the product; is it important to succeed?
Recommend to friends comments close window Bearing related knowledge China rolling mill oil film bearing skills (2)
What are the methods for FAG single-row angular touch bearings to control the influence of bearing noise?
The reason for the rise of NTN bearing temperature and the corresponding treatment methods from the application characteristics and advantages of smooth bearings
This article links to http://
Please indicate the bearing network http://
Previous:Detailed discussion on the reason of "thrust ball bearing overheating": The cold treatment of bearing rings
Source: China Bearing Network Time: 2018-04-10