China OEM Pay-off Reel Tension Reel Mandrel Repair and Manufacture with high quality

Product Description

Segment for coiling and uncoiling mandrel manufacturer

For hot rolling 
The mandrel is the key part of hot rolling tension reel for coils. Coiling temperature is between 550 to 850ºC. The mandrel has mainly 2 types: link wedge type and double wedge type.

Link wedge type can also be divided into 2 kinds: link wedge-coupling drive and link-spline drive.

For link wedge-coupling type tension reel, the mandrel is mainly composed of mandrel body, spreader bar, segment, link, wedge and spreading cylinder. Spreader bar has multistage slopes and segment is supported by multistage wedge. Segment is connected with spreader bar by link so segment does not drop off. With compression spring in the middle of wedge, wedge can firmly contact segment and pyramid surface. There is a gap between the upper surface of wedge and segment, which can reduce the impact of coil head to mandrel during coiling coil. Mandrel body is installed on 2 bearings. Power is transmitted by crowned-teeth coupling in the real. It is very convenient to dismantle, and due to there is no gear impact during working, mandrel rigidity is improved. It’s very beneficial to control the dynamic tension.

The spreading principle of mandrel: spreader bar moves inside mandrel body in axial direction dreivern by hydraulic cylinder, the slant of sperader bar pushes the wedge inside radial hole of mandrel body to move outward. The wedge surface pushes segment to expand outward. Wedge diameter will expand. After coiling coils, spreader bar moves in the opposite direction driven by hydraulic cylinder, and pulls segment to shrink through link. Wedge moves inward and mandrel diameter becomes smaller to discharge state. Then you can begin to discharge coil.

For the 2 types of link wedge-coupling drive and link wedge-spline drive, the mandrel structures and principles are almost same and the main difference is drive type of mandrel. For link wedge-spline drive type, connection between mandrel and main transmission cases is spline, i.e. insert type. When mouting and dismantling, mandrel can be directly inserted or pulled out of the main transmission cases to achieve the rapid replacement.
The main driving motor drives gear shaft rotation through the intermediate shaft. The gear shaft dirves big gear rotation, and the big gear drives mandrel rotation through spline.

For the double wedge type tension reel, the mandrel is mainly composed of mandrel body, spreader bar, segment, spreader wedge, buffer wege and hyd. Cylinder.

The spreading principle of double wedge type mandrel: hyd. Cylinder makes spreader bar move back and forth in axial direction and the wedge move in radical direction. So the segment becomes big. T-hook on spreader bar pulls wedge back and the hook outside the wedge pulls segment back. This will make the manderel small. With spline connectiion for power transmission unit, mandrel can be rapidly replaced. Cooling water channel inside the mandrel, so cooling effect is good. Lubricant can be injected by auto and manual type, so it can reduce parts wear.

Pay-off reel and tension reel for cold rolling coils are used in cold rolling production line or pay-off when acid pickling,galvanization,annealing,shear,coating or coil tension in out let.
Cold rolling mandrel is the key part of pay-off reel and tension reel. According to different structure, it has beam wedge type, pyramid axis type, pyramid sleeve type, wedge type, radial direction hydraulic cylinder type, etc. Or simply, open type and close type. The close type mandrel is a close circle without gap in the surface after is suitable for coiling thin strip steel. The open type mandrel means there is a gap between segments after mandrel expanding, suitable for coiling thicker strip steel.
For cold rolling
Pay-off reel and tension reel for cold rolling coils are used in cold rolling production line or pay-off when acid pickling, gavanization, annealing, shear, coating or coil tension in outlet.

Cold rolling mandrel is the key parts of pay-off reel&tension reel. According to different structure, it has beam wedge type, pyramid axis type, pyramid sleeve type, wedge type, radial direction hydraulic cylinder type, ect. Or simply, open type and close type. The close type mandrel is a close circle without gap in the surface after expanding. It is suitable for coiling thin strip steel. The open type mandrel means there are a gap between segment after mandrel expanding, suitable for coiling thicker strip steel.

The beam wedge type mandrel is mainly composed of the main shaft, expanding core, segment, axial direction wedge, radial direction wedge and spreading cylinder, etc. There are 2 kinds of structure: with jaw or without jaw. The mandrel with jaw is used for coiling thicker strip steel. It can also be set with steel sleeve or paper sleeve to coil with belt wrapper. The mandrel without jaw is used for coiling thin strip steel by belt wrapper.

The mandrel will move along axial direction driven by the expanding core & wedge block, through relative sliding between the wedge block and segment, swelling and shrinking will occur in radial direction, reset by spring.

The pyramidal axis type mandrel is divided into tapper type and back taper type according to the tilting direction of axis slope. This mandrel has simple structure ,less parts, large main shaft section and high strength .So it can bear large tension, not only coiling ,but also uncoiling. There are 2 kinds of structure: with jaw or without jaw .it’s mainly consisted of the pyramid axis, segment, hollow sleeve and spreading cylinder, etc.

Presently, the back taper type mandrel is the most popular. The oil goes into the cylinder via a rod cavity. The cylinder pulls the pyramidal shaft backward along axial direction and push segment to expand outside, so the drum is expanded. Pyramidal axis moves back ward along axial direction, and segment is pulled back by the T-key, thus the mandrel is shrinked.

KMD introduction:

Location: HangZhou
Established year: 1997
Staffs: 800
Engineer members: 180

Main lines: Electromagnetic liftings, electromagnetic sirrers, magnetic separators, Cable reels, Mandrels, Oil film bearing seat, etc.
Export countries: over 40 countries including Vietnam, Pakistan, Phillipines, India, Korea, Myanmar, Laos, Thailand, Mylaysia, Russia, Ukrain, Indonesia,  Turkey,  Spain, USA, etc.
Certifications: CE, ISA, ISO9001
Applications: Metallurgy, Electricity, Mining, Cement industry, Sugar industry, Food, Building materials, Traffic, Light industry, etc.

Welcome to visit our factory!!

Exhibition all over the world


Xihu (West Lake) Dis.d by managing conception as
Xihu (West Lake) Dis.d the direction by advanced technology,
Exploited the market by perfect service
Building the reputation by excellent quality.


Q1.Are you factory?
Yes. We are lifting electromagnet factory, and we also factory for electromagnet stirrer, control cabinet, cable reel, electromagnetic separator, and mandrel since 1997. With 23 years history our clients are more than 2000, and export more than 50 countries. Our plant area is more than 60,000 square meters.

Q2.How fast can i get the quotation?

A: We usually quote within 24 hours after we get your inquiry.If you are very urgent to get the price, please call us or tell us in your email so that we will regard your inquiry priority.


Q3. What’s your payment terms?
A: T/T, DP or L/C AT SIGHT for first cooperation..


Q4.Can I get sample before order? 
A: Yes, of course. After price confirmation, you can require for samples to check our quality, but the freight is on your site.

Q5. Do you accept OEM?

A: Yes. We accept custom design OEM.

Q6. How do you make our business long-term and good relationship?

A: 1. We keep good quality and competitive price to ensure our customers benefit;

 2. We respect every customer as our friend and we sincerely do business and make friends with them, no  matter where they come from.


Applications of Spline Couplings

A spline coupling is a highly effective means of connecting 2 or more components. These types of couplings are very efficient, as they combine linear motion with rotation, and their efficiency makes them a desirable choice in numerous applications. Read on to learn more about the main characteristics and applications of spline couplings. You will also be able to determine the predicted operation and wear. You can easily design your own couplings by following the steps outlined below.

Optimal design

The spline coupling plays an important role in transmitting torque. It consists of a hub and a shaft with splines that are in surface contact without relative motion. Because they are connected, their angular velocity is the same. The splines can be designed with any profile that minimizes friction. Because they are in contact with each other, the load is not evenly distributed, concentrating on a small area, which can deform the hub surface.
Optimal spline coupling design takes into account several factors, including weight, material characteristics, and performance requirements. In the aeronautics industry, weight is an important design factor. S.A.E. and ANSI tables do not account for weight when calculating the performance requirements of spline couplings. Another critical factor is space. Spline couplings may need to fit in tight spaces, or they may be subject to other configuration constraints.
Optimal design of spline couplers may be characterized by an odd number of teeth. However, this is not always the case. If the external spline’s outer diameter exceeds a certain threshold, the optimal spline coupling model may not be an optimal choice for this application. To optimize a spline coupling for a specific application, the user may need to consider the sizing method that is most appropriate for their application.
Once a design is generated, the next step is to test the resulting spline coupling. The system must check for any design constraints and validate that it can be produced using modern manufacturing techniques. The resulting spline coupling model is then exported to an optimisation tool for further analysis. The method enables a designer to easily manipulate the design of a spline coupling and reduce its weight.
The spline coupling model 20 includes the major structural features of a spline coupling. A product model software program 10 stores default values for each of the spline coupling’s specifications. The resulting spline model is then calculated in accordance with the algorithm used in the present invention. The software allows the designer to enter the spline coupling’s radii, thickness, and orientation.


An important aspect of aero-engine splines is the load distribution among the teeth. The researchers have performed experimental tests and have analyzed the effect of lubrication conditions on the coupling behavior. Then, they devised a theoretical model using a Ruiz parameter to simulate the actual working conditions of spline couplings. This model explains the wear damage caused by the spline couplings by considering the influence of friction, misalignment, and other conditions that are relevant to the splines’ performance.
In order to design a spline coupling, the user first inputs the design criteria for sizing load carrying sections, including the external spline 40 of the spline coupling model 30. Then, the user specifies torque margin performance requirement specifications, such as the yield limit, plastic buckling, and creep buckling. The software program then automatically calculates the size and configuration of the load carrying sections and the shaft. These specifications are then entered into the model software program 10 as specification values.
Various spline coupling configuration specifications are input on the GUI screen 80. The software program 10 then generates a spline coupling model by storing default values for the various specifications. The user then can manipulate the spline coupling model by modifying its various specifications. The final result will be a computer-aided design that enables designers to optimize spline couplings based on their performance and design specifications.
The spline coupling model software program continually evaluates the validity of spline coupling models for a particular application. For example, if a user enters a data value signal corresponding to a parameter signal, the software compares the value of the signal entered to the corresponding value in the knowledge base. If the values are outside the specifications, a warning message is displayed. Once this comparison is completed, the spline coupling model software program outputs a report with the results.
Various spline coupling design factors include weight, material properties, and performance requirements. Weight is 1 of the most important design factors, particularly in the aeronautics field. ANSI and S.A.E. tables do not consider these factors when calculating the load characteristics of spline couplings. Other design requirements may also restrict the configuration of a spline coupling.


Spline couplings are a type of mechanical joint that connects 2 rotating shafts. Its 2 parts engage teeth that transfer load. Although splines are commonly over-dimensioned, they are still prone to fatigue and static behavior. These properties also make them prone to wear and tear. Therefore, proper design and selection are vital to minimize wear and tear on splines. There are many applications of spline couplings.
A key design is based on the size of the shaft being joined. This allows for the proper spacing of the keys. A novel method of hobbing allows for the formation of tapered bases without interference, and the root of the keys is concentric with the axis. These features enable for high production rates. Various applications of spline couplings can be found in various industries. To learn more, read on.
FE based methodology can predict the wear rate of spline couplings by including the evolution of the coefficient of friction. This method can predict fretting wear from simple round-on-flat geometry, and has been calibrated with experimental data. The predicted wear rate is reasonable compared to the experimental data. Friction evolution in spline couplings depends on the spline geometry. It is also crucial to consider the lubrication condition of the splines.
Using a spline coupling reduces backlash and ensures proper alignment of mated components. The shaft’s splined tooth form transfers rotation from the splined shaft to the internal splined member, which may be a gear or other rotary device. A spline coupling’s root strength and torque requirements determine the type of spline coupling that should be used.
The spline root is usually flat and has a crown on 1 side. The crowned spline has a symmetrical crown at the centerline of the face-width of the spline. As the spline length decreases toward the ends, the teeth are becoming thinner. The tooth diameter is measured in pitch. This means that the male spline has a flat root and a crowned spline.


Spindle couplings are used in rotating machinery to connect 2 shafts. They are composed of 2 parts with teeth that engage each other and transfer load. Spline couplings are commonly over-dimensioned and are prone to static and fatigue behavior. Wear phenomena are also a common problem with splines. To address these issues, it is essential to understand the behavior and predictability of these couplings.
Dynamic behavior of spline-rotor couplings is often unclear, particularly if the system is not integrated with the rotor. For example, when a misalignment is not present, the main response frequency is 1 X-rotating speed. As the misalignment increases, the system starts to vibrate in complex ways. Furthermore, as the shaft orbits depart from the origin, the magnitudes of all the frequencies increase. Thus, research results are useful in determining proper design and troubleshooting of rotor systems.
The model of misaligned spline couplings can be obtained by analyzing the stress-compression relationships between 2 spline pairs. The meshing force model of splines is a function of the system mass, transmitting torque, and dynamic vibration displacement. This model holds when the dynamic vibration displacement is small. Besides, the CZPT stepping integration method is stable and has high efficiency.
The slip distributions are a function of the state of lubrication, coefficient of friction, and loading cycles. The predicted wear depths are well within the range of measured values. These predictions are based on the slip distributions. The methodology predicts increased wear under lightly lubricated conditions, but not under added lubrication. The lubrication condition and coefficient of friction are the key factors determining the wear behavior of splines.

China OEM Pay-off Reel Tension Reel Mandrel Repair and Manufacture     with high qualityChina OEM Pay-off Reel Tension Reel Mandrel Repair and Manufacture     with high quality