China Good quality Hot Forged 4140 4340 25crmo4 Steel Shaft Sintered Blower Main Shaft Drop-off Main Shaft near me manufacturer

Product Description

ZheJiang Qilu Industrial Co., Ltd has the capacity to guarantee the quality for every step, from raw material (forging), then heating treatment, finally machining. We have our own forging mill, heating teatment shop and machining shop. At present we could supply various of lage main shaft, turbin shaft, cylinder shaft, windy generator shaft, roller shaft, wheel forging, drill bit forging and kinds of irregular parts based on the drawing provided by customers.

Steel material for shaft and forging parts:
 

Engineering Steel  
GB
GB/T 700
JIS
JIS G3101
DIN (W-Nr.)
EN10571-2 / DIN17100
AISI/ASTM
ASTM A36
BS OTHERS
Q235B SS400 S235JR / RST37-2 A36    
Q235C   S235J0 / ST37-3 U      
Q235D   S235J2      
GB
GB/T1591
JIS DIN (W-Nr.)
EN10571-2 / DIN17100
AISI/ASTM BS OTHERS
Q355B   S355JR      
Q355C   S355J0 / ST52-3U      
Q355D   S355J2 / ST52-3 N      
Q355E   S355K2      
GB
GB/T 699
JIS
JIS G4051
DIN (W-Nr.)
EN 10083-2
AISI/ASTM
ASTM A20
BS OTHERS
      1018 EN2C  
20 S20C C20 1571 EN3B/070M20 ASTM A105
35 S35C C30 1035    
45 S45C C45E/1.1191 1045 EN8D/080M40  
50 S50C C50/1.1206 1050 080M50  
55 S55C C55 1055 EN9/070M55  
GB
GB/T 3077
JIS
JIS G4105/JIS G4103
DIN (W-Nr.)
EN 15710
AISI/ASTM
ASTM A29
BS
BS 970
OTHERS
40Cr SCr440 41Cr4(1.7035) 5140    
15CrMo SCM415 16CrMo44/1.7337      
20CrMo SCM420 18CrMo4/1.7243 4118    
30CrMo SCM430 25CrMo4/1.7218 4130 708A25/708M25  
42CrMo SCM440 42crmo4/1.7225 4140 EN19/709M40  
  SCM445   4145    
40CrNiMoA SNCM 439/SNCM8 36CrNiMo4/1.6511 4340 EN24/817M40  
    40NiMoCr10-5/1.6745   EN26/826M40  
    34CrNiMo6 / 1.6582 4337    
    30CrNiMo16-6/1.6747 4330V EN30B/835M30  
    32CrMo12/1.7361   EN40B/722M24  
16CrMnH / 20CrMnTi   16MnCr5 / 1.7131 5115    
20CrMn   20MnCr5 / 1.7147      
    15CrNi6/1.5919 3115    
    16NiCr4/1.5714   EN351/637M17  
      4615/4617 EN34/665M17  
    14NiCr14/1.5752 3310/3415 EN36/655M13  
    15NiCrMo16-5/1.6723   EN39/835M15  
17CrNiMo6   18CrNiMo7-6 (1.6587) 4815    
20CrNiMo SNCM220 1.6523/21NiCrMo2 8620 805M20  
    20CrNiMo5   EN353  
GCr15 SUJ2 52100/1.3505   EN31/535A99  
38CrMoAl SACM645 41CrAlMo7/34CrAlMo5   905M39/905M31 41CrAlMo74(ISO)

 

ZheJiang Qilu Industrial Co., Ltd were already engaged in exporting steel for 11 years, could supply a great variety of hot forged, hot rolled and cold drawn Steels,  including engineering steel, cold work tool steel, hot work tool steel, plastic mold steel, spring steel, high speed steel, stainless steel etc., besides Qilu Industrial also has their own heating treatment shop and machining shop to provide heating treatment, cutting and further machining service.

Since 2008 year, ZheJiang Qilu Industrial has the right to export all FORGED STEEL behalf of Qilu Speical Steel Co.,ltd which is specialized in smelting and forging of special steel since 1965 year, now Qilu special steel is 1 of the biggest manufacturer of forged product in China.The forged products are used in Automotive, Aerospace, Power Generation, Oil & Gas, Transportation and Industrial. 

Till 2013 year, many customers need HOT ROLLED and COLD DRAWN steel from Qilu Industrial, in order to provide one-stop solution to our customers, Qilu Industrial began to cooperate with Xihu (West Lake) Dis.bei Special Steel (HangZhou and HangZhou mill), Baosteel, Tiangong International, Changcheng Special Steel for hot rolled tool steel, cooperate with HangZhou Speical Steel, HangZhou HangZhou Speical Steel, Shagang Group, CZPT Group for hot rolled engineering steel. Now we already set up the warehouse in HangZhou and HangZhou City, more than 20000 tons ex-stock could be supplied with kinds of sizes.

Then from 2018 year, Qilu Industrial decide to provide further manufacturer processing service, at present we could supply various of lage main shaft, turbin shaft, cylinder shaft, windy generator shaft, roller shaft, wheel forging, drill bit forging and kinds of irregular parts based on the drawing provided by customers.

Qilu Industrial is the professional one-stop steel manufacturer, stockist and exporter in China, our customers spread all over the world, include West Europe, North America, South America, Asia, Middle Asia, Africa, Australia, etc.

The company owns advanced special steel smelting facilities and forging processing equipments, the main steel-making equipment include 2 sets of 50t ultra-high power electric arc furnaces,2 sets of 60t LF refining furnaces,1 set of 60t vacuum degassing refining CZPT and 4 sets of 1-20t electroslag re-melting furnaces.
The main forging equipments mainly include:3 sets of 5t electro-hydraulic hammers, 1 set of high-speed forging units of 800t,1600t,2000t and 4500t respectively.

 

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.
splineshaft

Involute splines

An effective side interference condition minimizes gear misalignment. When 2 splines are coupled with no spline misalignment, the maximum tensile root stress shifts to the left by 5 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 50-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 4 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 3 components.
splineshaft

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 2 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 2 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.
splineshaft

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 3 factors. A failure mode is often defined as a non-linear distribution of stresses and strains.

China Good quality Hot Forged 4140 4340 25crmo4 Steel Shaft Sintered Blower Main Shaft Drop-off Main Shaft     near me manufacturer China Good quality Hot Forged 4140 4340 25crmo4 Steel Shaft Sintered Blower Main Shaft Drop-off Main Shaft     near me manufacturer