HOT INFORMATION / More
1
2018 - 09 - 03
In order to remove the detergent, wash the surface with clean water at the end of washing.Surface condition and washing methodDust and easy to remove dirt - wash with soap, weak lotion or warm water.Label and film: scrub with warm water and weak detergent.Binder composition - using alcohol or organic solution;Fat, oil, lubricating oil contamination - with a soft cloth or paper after drying with a neutral detergent or ammonia solution or special detergent to wash;Bleaching agent and seed acid adherence - immediately rinse with water, soak in ammonia or neutral soda solution, then wash with neut...
2
2018 - 09 - 17
(1) metal tissue1. Metal: it has good thermal and electrical conductivity with opaque and metallic luster, and its electrical conductivity decreases with the increase of temperature, and it is rich in ductility and malleability.A solid (or crystal) in which the atoms of a metal are regularly arranged.2. Alloy: a substance which is composed of two or more metals or metals and non-metals and has metal properties.3. Phase: components with the same composition, structure and performance in the alloy.Solid solution: an atom (compound) of one (or several) element dissolves into the lattice of anothe...
3
2018 - 09 - 27
In the actual work, we often encounter that the spring cannot push the moving object to the set position, that is to say, the length of the spring's computational freedom becomes shorter.The main reason is that there is no initial compression, that is, a spring is made into a spring, which is compressed to its compression height or to its compression height (if necessary) with a greater force, and cannot be restored to its original free length upon release.Its shortened quantity is called "initial compression quantity".After repeating 3-6 times of compression, the length is no lo...
4
2018 - 10 - 12
The spring is often corroded by the surrounding medium in the process of manufacture, storage and use.As the spring works under the influence of the spring force, the spring force will change and lose its function after being corroded.Therefore, preventing the corrosion of the spring can guarantee the stability of the spring and extend its service life.The corrosion of spring can be divided into chemical corrosion and electrochemical corrosion according to the type of reaction.They are the result of changes in the metal atoms on the surface of the spring or the loss of electrons to an ionic st...
5
2018 - 10 - 23
For a long time, the shape and performance of the extension spring will change. If the extension spring is always in a certain situation, it may change its quality due to external conditions.Generally, there are the following situations:I. wear of extension spring :Wear can be divided into abrasive, fatigue and corrosion wear fracture.Ii. Brittle fractureThe majority of spring break belongs to brittle fracture.Plastic fracture is possible only when the working temperature is high.In engineering, fatigue fracture, stress corrosion fracture and hydrogen embrittlement fracture are calle...
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2019 - 12 - 16
Put simply, the most important factors of torsion spring performance are spring rate deflection, load capacity, and wind. In a torsion spring, spring rate accounts for the return of angular torque per unit of angular displacement. Deflection is the amount that the spring resists pressure before overstressing itself and becoming damaged (bent), and the wind is simply how the spring is wound, be it right (clockwise), left (counterclockwise), or with double torsion.torsion springThe following is the necessary information of a torsion spring:(1) control diameter: (a) outer diameter, (b) ...
7
2018 - 07 - 25
Core tip: the surface of spring can be generally treated, such as blackening (blue), phosphating, electroplating, spray molding, etc. In recent years, the zinc chromium film dacroa DACROMET dacroa protective layer has excellent corrosion resistance, which is 710 times the corrosion resistance of the traditional electroplating layer, and there is no hydrogen embrittlement in the electroplating process. Generally, the surface of springs can be treated, such as blackening (blue), phosphating, electroplating, spray molding, etc. In recent years, the zinc chromium film "dacrom DACROMET da...
8
2018 - 08 - 07
What is the fall of autumn?The fall of autumn, the thirteenth throttle of the twenty-four solar calendar in the lunar calendar, is the first throttle of autumn, marking the official start of the season of Meng Qiu: "autumn" means the summer to cool. By the beginning of autumn, the Chinese parasol trees began to shed their leaves. From the point of view of writing, the word "Qiu" is composed of grass and fire characters. Autumn is a transitional season from hot to cool and then from cold to cold.The fall of autumn, July. A word can be found in spring. Autumn is the same.At t...
9
2018 - 08 - 17
8, detection of fatigue property and relaxation rate of spring8.1 spring fatigue performance testing requirements: the spring that bears the variable load is in the internal quality of the enterprise.Quantity control, user inspection, new product certification, certification, industry sampling and process adjustment.In the ring section, the fatigue performance must be tested. The testing method can be tested by fatigue life testThere are two kinds of certificate test or reliability evaluation test, but they are classified and certified for products.Reliability evaluation test must be adopted t...
NEW INFORMATION / More
1
2018 - 09 - 12
Spring machine is now in the production of spring necessary equipment, due to the abundant of spring and the increase of precision is also more and more high to the requirement of spring machine, the spring machine maintenance is particularly important at ordinary times, and the main factors affecting the service life of spring machine has two, one is the operator of whether scientific and standardized operation, another is reasonable in daily maintenance.After using the spring machine for a period of time, the efficiency of the machine will be significantly reduced, affecting the efficiency o...
2
2018 - 09 - 22
1) high strength: in order to improve the spring's ability to resist fatigue failure and relaxation, the spring material should have a high yield strength and elastic limit, and in particular, a high ratio of strength to strength.In general, the elastic limit of the material is directly proportional to the yield strength, so the spring design and the manufacturer always want the material to have a high yield strength.The tensile strength and yield strength of the spring material are close, for example, about 90% of the carbon steel wire of cold drawn is about: since the tensile strength is...
3
2018 - 10 - 09
The paint used for the spring coating is usually of the following types:(1) asphalt paint has good water resistance, moisture resistance and corrosion resistance, especially excellent acid resistance and good alkali resistance.But adhesion, mechanical strength, poor decorative performance.(2) phenolic paint can be divided into two types: primer and topcoat. Phenolic primer has strong adhesion, good rust resistance, but poor mechanical strength and gloss.Phenolic coating film is hard, gloss good, but poor weather resistance, easy to yellow.(3) alkyd paint alkyd paint film is tough, with strong ...
4
2018 - 10 - 19
When the spring is made from materials that do not need to be hardened or tempered after forming, the process is spiral compression spring: rolling, de-stressed annealing, grinding of two ends, (shot blasting), (rectification), (de-stressed annealing), standing or strong pressure treatment, inspection, surface anti-corrosion treatment, packaging.Coil stretching spring: rolling, de-stress annealing, hook making, (cutting the tail), de-stress annealing, standing treatment, inspection, surface anti-corrosion treatment, packaging.Spiral torsion spring: rolling, de-stress annealing, torsion arm mak...
5
2018 - 11 - 02
Cylindrical spiral spring structureThere are three types of cylindrical spiral spring:1. Cylindrical spiral compression spring1) spacing between springsLet the spring's pitch be p;The diameter of the spring wire is d;In the free state, there should be proper spacing between the circles.In order to make the spring still maintain a certain elasticity after compression, it is also necessary to ensure that there is a certain gap of 1 between each circle under the maximum load.The size of lens 1 is generally recommended to be: in addition 1=0.1d or greater than 0.2mm2) dead circleThe two ends o...
6
2018 - 08 - 01
The basic spring parameters of the spring:1. Spring wire diameter D: wire diameter of spring.2. The outer diameter of the spring D2: the maximum outer diameter of the spring.3. The inner diameter of the spring D1: the smallest outer diameter of the spring.4. The middle diameter of the spring is D: the average diameter of the spring. Their calculation formula is: D= (D2+D1) +2=D1+d=D2-d5, pitch T: except for the support ring, the distance between the two adjacent circles of the spring corresponds to the axial distance on the middle diameter of the spring, and is expressed by t.6, effective circ...
7
2018 - 08 - 15
1, Test classificationA) First inspection;B) Quality consistency check.2, A spring group of groupsThe spring shall be inspected according to the batch. Each batch shall consist of the same material specifications, grades, melting furnace numbers and springs made under the same technological conditions.3, First test3.1 The inspection of the production of the spring first piece must be carried out according to the test or inspection items specified in the drawings, and the determination of qualified and unqualified shall be made. 3.2 The first piece of spring must be checked and recorded in...
8
2018 - 08 - 29
In view of the harm caused by the surface defects of high carbon steel wire rods, the surface defects of high carbon steel wire rods were systematically analyzed by means of surface pickling, metallographic analysis and scanning electron microscopy, the types of defects were determined, the causes of defects were analyzed, and the improvement measures were put forward. After the implementation of these measures, the surface defects of high carbon steel wire rods were basically eliminated. Surface quality defects. The conclusions are as follows: 1. The surface defects found in high carbon ...
9
2018 - 09 - 12
There are many methods of construction of paint, most of which are used for springs in the following ways:(1) dip coating method dip coating method is to dip the spring into the paint groove, and then take out, and let the excess paint on the surface drip naturally. After drying, it is covered with paint film on the surface of the spring.The dip-coating method has high production efficiency and can be applied to mechanization and automation production.But the paint volatilizes quickly, the paint that contains heavy quality pigment and two component paint material (amine solidify epoxy paint, p...
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Steps of hardware spring pressure test

日期: 2018-09-03
浏览次数: 106
nelson

The spring pressure test of metal springs usually uses electronic digital spring tension and compression testing machine. Electronic digital spring tension and compression testing machine is a special instrument for testing the deformation and load relationship characteristics of tension and compression springs. It is suitable for testing the working load of the tension and compression spring under a certain working length, and also for testing the elastic load of elastic devices such as rubber and spring.

The pressure test of metal springs is generally divided into the following steps:

1. Compress the spring to the test load once before the formal test. When the test load is heavier than the pressure and the load, the test load is the pressure and the load, but the maximum pressure and the load does not exceed 1.5 times the constant pressure and the load.

2 Preparing for load test and determination: Correct the load test machine with the third-class standard dynamometer of the corresponding range or weights of more than one precision to ensure that the precision of the test machine is not less than 1%; check the length reading error of the load test machine with the amount of block.

Steps of hardware spring pressure test

Testing and measuring the load of metal spring pressing to a specified height: Place the measuring block of the same height in the center of the pressure plate of the load testing machine; Load the load near the nominal value of the pattern on the measuring block; Lock the positioning screw or pin; Put the measuring block into the spring to be measured, adjust the zero position and remove the spring self-weight; Press the spring to the designated value. Height, and read the corresponding load; according to the calibration of the load test machine error, read the correction.

4) Pressing the upper pressure plate to the position just contacted with the spring, the predicted value F0_0.05F of the load testing machine, recording the initial reading F0 and the reading of the length indication value of the load test, and loading successively, so that the reading change value predicted by the length has reached the prescribed variant.


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2020 . 01 . 13
Constant force spring, or “clock” spring, is a roll of prestressed strip which exerts a nearly constant restraining force to resist uncoiling. The force is constant because the change in the radius of curvature is constant.   Such applications as brush springs for motors, counterbalance springs for window sashes and carriage return springs for typewriters. Constant force motor springs are used to drive mechanisms for timers, movie cameras and cable retractors.Constant force spring also known as coil spring helix in a plane of the spring, Spring is the material wound into a plane of the spiral of a spring, the spring is fixed at one end, the other end of the material after acting torque bending torque, bending elastic deformation, so the spring in its own plane to p...
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