Solution Description
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Identify: China personalized cast iron anti rust pipe fittings grooved fittings plumbing sleeve coupling
Min get: a thousand pcs
Packing: export normal packing
Custom-made creation is available as your drawings or sample.
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About quality
We insist that the survival of the company need to count on the products high quality constant enhancement, with no which we cannot survive for prolonged.
Our item good quality management technique
Good quality manage involves the inspection and manage of incoming components, creation procedure and concluded merchandise.
1 To begin with, metallurgical microscope analysis is performed on randomly sampled incoming supplies to ensure that the chemical composition satisfies the manufacturing requirements.
2 Then, during the manufacturing procedure, there are QC staff to conduct timely location checks to ensure that the solution is free of defects in the course of the manufacturing process and to coordinate and handling of any irregular quality problems that could come up.
3 The final step in the manufacturing approach is a magnetic particle detector for steel areas to detect hidden cracks or other flaws.
four All the concluded steel parts is sampled in proportion and sent to the laboratory for a variety of mechanical residence assessments and dimensional measurements, and the area quality is manually 100% inspected.
five About the good quality administration system, we strictly carry out system management in accordance with ISO9001 and TS16949 high quality specifications and 5S lean creation administration is executed on the manufacturing web site.
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Our Positive aspects:
1 We have a full production process and equipment analysis and improvement abilities for ferrous metal forming. In excess of 25 many years of creation encounter of forging gear and casting products make us very own deep stage knowing and working of all equipments’ overall performance and running.
two Our mum or dad organization, HiHangZhou Team, is a entire world-renowned substantial-stop equipment manufacturing business with more than thirty domestic subsidiaries and branches. The revenue volume of 4 merchandise ranks No1 nationwide and even worldwide, supplying us with a sturdy specialized and financial support.
3 1-3rd of more than three hundred personnel are complex R&D associates, making sure the ongoing specialized innovation and the sustainable improvement of our firm.
four Our company implements the worker stock ownership system of firm shares Rising members’ feeling of duty, creative imagination and perform inspiration.
five The company is a product company in the area of minimal-carbon environmental security, and power conserving and emission reduction in reduction.
six Special business lifestyle, and the regular rotation of person work placement give total perform to the possible of skills and provide robust vitality for the development of the business.
7 Our Support:
A. Custom-made and Common Producing Provider
B. A selection of Producing Approach Integration
C. Good quality and Shipping and delivery Time Certain
D. Successful Communication Capacity
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Business Culture
Our Eyesight
To become 1 of the top organizations
Our Mission
To turn into a system for employees to realize their dream
To turn into 1 of the transforming and upgrading pacemaker of Chinese enterprises
To established the national brand names with delight
Our Belief
Attempt to develop the business into an perfect platform for business owners to comprehend their self-worth and lead to the culture
Values
Advancement is innovation, everyone can innovate
innovation motivated and failures tolerated
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FAQ
1.
Q: Are you a trading business or a company?
A: Clearly we are a company of forging items, casting merchandise and also have a large degree of machining abilities.
two.
Q: What series goods do your have?
A: We are largely engaged in forming processing of ferrous metals, which includes processing by casting , forging and machining. As you know, this kind of equipment components can be noticed in different industries of gear manufacturing.
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Q: Do you supply samples? is it free of charge?
A: Yes, we generally offer samples in accordance to the standard exercise, but we also want consumers to supply a freight pay-by-account number to present mutual sincerity of cooperation.
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Q: What is your minimal order quantity?
A: Indeed, we need all worldwide orders to have an minimal buy amount. The amount is up to the precise merchandise attribute or property such as the content, bodyweight, development etc.
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Q: What is the direct time?
A: Typically our forging merchandise and casting merchandise need to have to make new dies or molds, the time of producing new dies or molds and samples in 30-forty five days, and the big batch generation time inside of thirty-forty five times. it is also according to the components structural complexity and amount.
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Q: What types of payment methods do you accept?
A: You can make the payment by T/T or L/C. thirty% deposit in progress, 70% equilibrium against the copy of B/L.
| Process | Sand Casting, Investment Casting | |
| Material | Malleable Iron , Ductile Iron | |
| Weight | 0.1Kg~200Kg | |
| Testing instrument | composition testing | Spectrometer, Metallographic microscope |
| Performance testing | Hardness tester, Tensile testing machine | |
| Size Measuring | Vernier Caliper, Depth Caliper, feeler gauge,Thread Gauge , Height Gauge | |
| Roughness | Ra1.6~Ra6.3 | |
| Machining Equipment | CNC Center , CNC Machines, Turning, Drilling, Milling, Boring machine,Grinding Machines, | |
| Wire EDM,Laser Cutting&Welding, Plasma Cutting &Welding, EDM etc. | ||
| Quality control | Sampling inspection of raw materials and semi-finished products, 100% Inspection of finished products | |
| Surface Treatment | Sand Blast , Painting, Coating, Galvanized , Hot Galvanized | |
| Production Capacity | 60000T / Years | |
| Lead Time | Normally 30 – 45 Days. | |
| Payment Terms | T/T , L/C | |
| Material Standard | ASTM , AISI , DIN , BS, JIS, GB, | |
| Certification | ISO9001:2008, IATF16949:2016 | |
| Process | Sand Casting, Investment Casting | |
| Material | Malleable Iron , Ductile Iron | |
| Weight | 0.1Kg~200Kg | |
| Testing instrument | composition testing | Spectrometer, Metallographic microscope |
| Performance testing | Hardness tester, Tensile testing machine | |
| Size Measuring | Vernier Caliper, Depth Caliper, feeler gauge,Thread Gauge , Height Gauge | |
| Roughness | Ra1.6~Ra6.3 | |
| Machining Equipment | CNC Center , CNC Machines, Turning, Drilling, Milling, Boring machine,Grinding Machines, | |
| Wire EDM,Laser Cutting&Welding, Plasma Cutting &Welding, EDM etc. | ||
| Quality control | Sampling inspection of raw materials and semi-finished products, 100% Inspection of finished products | |
| Surface Treatment | Sand Blast , Painting, Coating, Galvanized , Hot Galvanized | |
| Production Capacity | 60000T / Years | |
| Lead Time | Normally 30 – 45 Days. | |
| Payment Terms | T/T , L/C | |
| Material Standard | ASTM , AISI , DIN , BS, JIS, GB, | |
| Certification | ISO9001:2008, IATF16949:2016 | |
How to Calculate Stiffness, Centering Force, Wear and Fatigue Failure of Spline Couplings
There are various types of spline couplings. These couplings have several important properties. These properties are: Stiffness, Involute splines, Misalignment, Wear and fatigue failure. To understand how these characteristics relate to spline couplings, read this article. It will give you the necessary knowledge to determine which type of coupling best suits your needs. Keeping in mind that spline couplings are usually spherical in shape, they are made of steel.
Involute splines
An effective side interference condition minimizes gear misalignment. When two splines are coupled with no spline misalignment, the maximum tensile root stress shifts to the left by five mm. A linear lead variation, which results from multiple connections along the length of the spline contact, increases the effective clearance or interference by a given percentage. This type of misalignment is undesirable for coupling high-speed equipment.
Involute splines are often used in gearboxes. These splines transmit high torque, and are better able to distribute load among multiple teeth throughout the coupling circumference. The involute profile and lead errors are related to the spacing between spline teeth and keyways. For coupling applications, industry practices use splines with 25 to fifty-percent of spline teeth engaged. This load distribution is more uniform than that of conventional single-key couplings.
To determine the optimal tooth engagement for an involved spline coupling, Xiangzhen Xue and colleagues used a computer model to simulate the stress applied to the splines. The results from this study showed that a “permissible” Ruiz parameter should be used in coupling. By predicting the amount of wear and tear on a crowned spline, the researchers could accurately predict how much damage the components will sustain during the coupling process.
There are several ways to determine the optimal pressure angle for an involute spline. Involute splines are commonly measured using a pressure angle of 30 degrees. Similar to gears, involute splines are typically tested through a measurement over pins. This involves inserting specific-sized wires between gear teeth and measuring the distance between them. This method can tell whether the gear has a proper tooth profile.
The spline system shown in Figure 1 illustrates a vibration model. This simulation allows the user to understand how involute splines are used in coupling. The vibration model shows four concentrated mass blocks that represent the prime mover, the internal spline, and the load. It is important to note that the meshing deformation function represents the forces acting on these three components.
Stiffness of coupling
The calculation of stiffness of a spline coupling involves the measurement of its tooth engagement. In the following, we analyze the stiffness of a spline coupling with various types of teeth using two different methods. Direct inversion and blockwise inversion both reduce CPU time for stiffness calculation. However, they require evaluation submatrices. Here, we discuss the differences between these two methods.
The analytical model for spline couplings is derived in the second section. In the third section, the calculation process is explained in detail. We then validate this model against the FE method. Finally, we discuss the influence of stiffness nonlinearity on the rotor dynamics. Finally, we discuss the advantages and disadvantages of each method. We present a simple yet effective method for estimating the lateral stiffness of spline couplings.
The numerical calculation of the spline coupling is based on the semi-analytical spline load distribution model. This method involves refined contact grids and updating the compliance matrix at each iteration. Hence, it consumes significant computational time. Further, it is difficult to apply this method to the dynamic analysis of a rotor. This method has its own limitations and should be used only when the spline coupling is fully investigated.
The meshing force is the force generated by a misaligned spline coupling. It is related to the spline thickness and the transmitting torque of the rotor. The meshing force is also related to the dynamic vibration displacement. The result obtained from the meshing force analysis is given in Figures 7, 8, and 9.
The analysis presented in this paper aims to investigate the stiffness of spline couplings with a misaligned spline. Although the results of previous studies were accurate, some issues remained. For example, the misalignment of the spline may cause contact damages. The aim of this article is to investigate the problems associated with misaligned spline couplings and propose an analytical approach for estimating the contact pressure in a spline connection. We also compare our results to those obtained by pure numerical approaches.
Misalignment
To determine the centering force, the effective pressure angle must be known. Using the effective pressure angle, the centering force is calculated based on the maximum axial and radial loads and updated Dudley misalignment factors. The centering force is the maximum axial force that can be transmitted by friction. Several published misalignment factors are also included in the calculation. A new method is presented in this paper that considers the cam effect in the normal force.
In this new method, the stiffness along the spline joint can be integrated to obtain a global stiffness that is applicable to torsional vibration analysis. The stiffness of bearings can also be calculated at given levels of misalignment, allowing for accurate estimation of bearing dimensions. It is advisable to check the stiffness of bearings at all times to ensure that they are properly sized and aligned.
A misalignment in a spline coupling can result in wear or even failure. This is caused by an incorrectly aligned pitch profile. This problem is often overlooked, as the teeth are in contact throughout the involute profile. This causes the load to not be evenly distributed along the contact line. Consequently, it is important to consider the effect of misalignment on the contact force on the teeth of the spline coupling.
The centre of the male spline in Figure 2 is superposed on the female spline. The alignment meshing distances are also identical. Hence, the meshing force curves will change according to the dynamic vibration displacement. It is necessary to know the parameters of a spline coupling before implementing it. In this paper, the model for misalignment is presented for spline couplings and the related parameters.
Using a self-made spline coupling test rig, the effects of misalignment on a spline coupling are studied. In contrast to the typical spline coupling, misalignment in a spline coupling causes fretting wear at a specific position on the tooth surface. This is a leading cause of failure in these types of couplings.
Wear and fatigue failure
The failure of a spline coupling due to wear and fatigue is determined by the first occurrence of tooth wear and shaft misalignment. Standard design methods do not account for wear damage and assess the fatigue life with big approximations. Experimental investigations have been conducted to assess wear and fatigue damage in spline couplings. The tests were conducted on a dedicated test rig and special device connected to a standard fatigue machine. The working parameters such as torque, misalignment angle, and axial distance have been varied in order to measure fatigue damage. Over dimensioning has also been assessed.
During fatigue and wear, mechanical sliding takes place between the external and internal splines and results in catastrophic failure. The lack of literature on the wear and fatigue of spline couplings in aero-engines may be due to the lack of data on the coupling’s application. Wear and fatigue failure in splines depends on a number of factors, including the material pair, geometry, and lubrication conditions.
The analysis of spline couplings shows that over-dimensioning is common and leads to different damages in the system. Some of the major damages are wear, fretting, corrosion, and teeth fatigue. Noise problems have also been observed in industrial settings. However, it is difficult to evaluate the contact behavior of spline couplings, and numerical simulations are often hampered by the use of specific codes and the boundary element method.
The failure of a spline gear coupling was caused by fatigue, and the fracture initiated at the bottom corner radius of the keyway. The keyway and splines had been overloaded beyond their yield strength, and significant yielding was observed in the spline gear teeth. A fracture ring of non-standard alloy steel exhibited a sharp corner radius, which was a significant stress raiser.
Several components were studied to determine their life span. These components include the spline shaft, the sealing bolt, and the graphite ring. Each of these components has its own set of design parameters. However, there are similarities in the distributions of these components. Wear and fatigue failure of spline couplings can be attributed to a combination of the three factors. A failure mode is often defined as a non-linear distribution of stresses and strains.
