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 expanding.it 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

Clients

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.

FAQ

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.

 

What Are the Advantages of a Splined Shaft?

If you are looking for the right splined shaft for your machine, you should know a few important things. First, what type of material should be used? Stainless steel is usually the most appropriate choice, because of its ability to offer low noise and fatigue failure. Secondly, it can be machined using a slotting or shaping machine. Lastly, it will ensure smooth motion. So, what are the advantages of a splined shaft?
Stainless steel is the best material for splined shafts

When choosing a splined shaft, you should consider its hardness, quality, and finish. Stainless steel has superior corrosion and wear resistance. Carbon steel is another good material for splined shafts. Carbon steel has a shallow carbon content (about 1.7%), which makes it more malleable and helps ensure smooth motion. But if you’re not willing to spend the money on stainless steel, consider other options.
There are 2 main types of splines: parallel splines and crowned splines. Involute splines have parallel grooves and allow linear and rotary motion. Helical splines have involute teeth and are oriented at an angle. This type allows for many teeth on the shaft and minimizes the stress concentration in the stationary joint.
Large evenly spaced splines are widely used in hydraulic systems, drivetrains, and machine tools. They are typically made from carbon steel (CR10) and stainless steel (AISI 304). This material is durable and meets the requirements of ISO 14-B, formerly DIN 5463-B. Splined shafts are typically made of stainless steel or C45 steel, though there are many other materials available.
Stainless steel is the best material for a splined shaft. This metal is also incredibly affordable. In most cases, stainless steel is the best choice for these shafts because it offers the best corrosion resistance. There are many different types of splined shafts, and each 1 is suited for a particular application. There are also many different types of stainless steel, so choose stainless steel if you want the best quality.
For those looking for high-quality splined shafts, CZPT Spline Shafts offer many benefits. They can reduce costs, improve positional accuracy, and reduce friction. With the CZPT TFE coating, splined shafts can reduce energy and heat buildup, and extend the life of your products. And, they’re easy to install – all you need to do is install them.

They provide low noise, low wear and fatigue failure

The splines in a splined shaft are composed of 2 main parts: the spline root fillet and the spline relief. The spline root fillet is the most critical part, because fatigue failure starts there and propagates to the relief. The spline relief is more susceptible to fatigue failure because of its involute tooth shape, which offers a lower stress to the shaft and has a smaller area of contact.
The fatigue life of splined shafts is determined by measuring the S-N curve. This is also known as the Wohler curve, and it is the relationship between stress amplitude and number of cycles. It depends on the material, geometry and way of loading. It can be obtained from a physical test on a uniform material specimen under a constant amplitude load. Approximations for low-alloy steel parts can be made using a lower-alloy steel material.
Splined shafts provide low noise, minimal wear and fatigue failure. However, some mechanical transmission elements need to be removed from the shaft during assembly and manufacturing processes. The shafts must still be capable of relative axial movement for functional purposes. As such, good spline joints are essential to high-quality torque transmission, minimal backlash, and low noise. The major failure modes of spline shafts include fretting corrosion, tooth breakage, and fatigue failure.
The outer disc carrier spline is susceptible to tensile stress and fatigue failure. High customer demands for low noise and low wear and fatigue failure makes splined shafts an excellent choice. A fractured spline gear coupling was received for analysis. It was installed near the top of a filter shaft and inserted into the gearbox motor. The service history was unknown. The fractured spline gear coupling had longitudinally cracked and arrested at the termination of the spline gear teeth. The spline gear teeth also exhibited wear and deformation.
A new spline coupling method detects fault propagation in hollow cylindrical splined shafts. A spline coupling is fabricated using an AE method with the spline section unrolled into a metal plate of the same thickness as the cylinder wall. In addition, the spline coupling is misaligned, which puts significant concentration on the spline teeth. This further accelerates the rate of fretting fatigue and wear.
A spline joint should be lubricated after 25 hours of operation. Frequent lubrication can increase maintenance costs and cause downtime. Moreover, the lubricant may retain abrasive particles at the interfaces. In some cases, lubricants can even cause misalignment, leading to premature failure. So, the lubrication of a spline coupling is vital in ensuring proper functioning of the shaft.
The design of a spline coupling can be optimized to enhance its wear resistance and reliability. Surface treatments, loads, and rotation affect the friction properties of a spline coupling. In addition, a finite element method was developed to predict wear of a floating spline coupling. This method is feasible and provides a reliable basis for predicting the wear and fatigue life of a spline coupling.

They can be machined using a slotting or shaping machine

Machines can be used to shape splined shafts in a variety of industries. They are useful in many applications, including gearboxes, braking systems, and axles. A slotted shaft can be manipulated in several ways, including hobbling, broaching, and slotting. In addition to shaping, splines are also useful in reducing bar diameter.
When using a slotting or shaping machine, the workpiece is held against a pedestal that has a uniform thickness. The machine is equipped with a stand column and limiting column (Figure 1), each positioned perpendicular to the upper surface of the pedestal. The limiting column axis is located on the same line as the stand column. During the slotting or shaping process, the tool is fed in and out until the desired space is achieved.
One process involves cutting splines into a shaft. Straddle milling, spline shaping, and spline cutting are 2 common processes used to create splined shafts. Straddle milling involves a fixed indexing fixture that holds the shaft steady, while rotating milling cutters cut the groove in the length of the shaft. Several passes are required to ensure uniformity throughout the spline.
Splines are a type of gear. The ridges or teeth on the drive shaft mesh with grooves in the mating piece. A splined shaft allows the transmission of torque to a mate piece while maximizing the power transfer. Splines are used in heavy vehicles, construction, agriculture, and massive earthmoving machinery. Splines are used in virtually every type of rotary motion, from axles to transmission systems. They also offer better fatigue life and reliability.
Slotting or shaping machines can also be used to shape splined shafts. Slotting machines are often used to machine splined shafts, because it is easier to make them with these machines. Using a slotting or shaping machine can result in splined shafts of different sizes. It is important to follow a set of spline standards to ensure your parts are manufactured to the highest standards.
A milling machine is another option for producing splined shafts. A spline shaft can be set up between 2 centers in an indexing fixture. Two side milling cutters are mounted on an arbor and a spacer and shims are inserted between them. The arbor and cutters are then mounted to a milling machine spindle. To make sure the cutters center themselves over the splined shaft, an adjustment must be made to the spindle of the machine.
The machining process is very different for internal and external splines. External splines can be broached, shaped, milled, or hobbed, while internal splines cannot. These machines use hard alloy, but they are not as good for internal splines. A machine with a slotting mechanism is necessary for these operations.