Main unit type is used in the main axle and the standard of the knife handle is BT40/NT40, servo motor and numerical control motor are used in the working table. Three axle linkages are adopted to meet the processing accuracy requirements. This lathe is suitable for semi-automatic processing such as: drilling, tapping, chamfering, bearing, milling face thread, handle and tower and other processes in the batch production and fit for the many workpieces and multi-machine management.
The machine’s main structure has high rigidity, Y/Z axes adopt rectangular guideway, X-axes adopt swallowtail guideway . The table surface and the guideways are hardened.
The machine is lubricated by the automatic lubrication mechanism.
X, Y, Z axes adopt ball screw, low-speed feed without crawl and high precision.
The spindle realizes the automatic infinitely variable speed by the way of motor.
With functions of tool self-lock.
|Main motor power
|Highest spindle speed
|X/Y/Z to the motor torque
|The spindle taper hole
|X/Y/Z axis travel
|Distance between spindle center and surface column
|The distance of spindle end face to the workbench
|Repeat posotioning accuracy
|Machine tool appearance size(L x W x H)
WMT CNC Industrial Co., Ltd. is located in the southwest of the Yangtze River in ZheJiang Province with famous Buddhist shrine in the north of Jiuhua Mountain. The transportation facilities here are very convenient, directly linked with many metropolis like ZheJiang , ZheJiang and HangZhou via the highway, international airport, and high-speed railway.
WMTCNC company focuses on the research and development, manufacturing, sales and service of various CNC machine tools. Our products are widely used in the processing of molds and parts for products in the aerospace, automotive, steel, petrochemical, and electronics industries. The products are exported to more than 50 countries and regions around the world with good reputation always.
Our main products are Vertical machining centers, Gantry machining centers, CNC milling machines, CNC lathes, Turning machining centers, common drilling and milling machines, milling machines, lathes, and DIY machine tools, etc.
Main functional components of machines are supplied by world-renowned brands such as Japan, ZheJiang and Germany. The concept of combining “craftsman spirit” and “intelligent manufacturing” runs through the research and development, production and sales of various products, relying on advanced processing And testing equipment, scientific management to ensure our products with the high precision, high rigidity and high efficiency. Our machines are the trustworthy product for mold and metal processing.
Q1: How is the warranty?
A1: Warranty time is 13 months after BL date.
Q2:Can we visit your factory before order?
A2:Sure.All new and old friends are welcomed to visit us at our factory. Besides,we can pick up you at the station or airport if needed. We will be very honored to help with tickets and accommodation booking.
Q3:Do you have a stock?
A3:Sorry, most of our machines don’t have stock, we always produce according to order. However, if during fairs months, maybe have few samples back from fairs.
Q4:What’s the MOQ?
A4:One set only.
Q5:How about your quality?
A5:We have approved the ISO9001:2008 Quality management system.ISO14001 Environmental management system, OHSAS18001 International occupational CZPT and safety management system, and Social Accountability 8000(SA8000). Most products have been approved by the European and American safety standards, including CE, GS, EMS&UL,90% of our products are exported to more than 60 countries and regions around the world, especially to Europe and America market and always win high reputation. So you can rest assured of our quality products and our best services.
Q6:Do you have professional engineers?
A6:Yes.we have professional engineers and designers. We can provide OEM services.
Q7:Can you provide customized machines?
A7:Yes, we can design and manufacture according to your specific requirements.
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.
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.
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.
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 3 factors. A failure mode is often defined as a non-linear distribution of stresses and strains.