Mandrel of Pay-off Reel and Tension Reel
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.;
The Benefits of Spline Couplings for Disc Brake Mounting Interfaces
Spline couplings are commonly used for securing disc brake mounting interfaces. Spline couplings are often used in high-performance vehicles, aeronautics, and many other applications. However, the mechanical benefits of splines are not immediately obvious. Listed below are the benefits of spline couplings. We’ll discuss what these advantages mean for you. Read on to discover how these couplings work.
Disc brake mounting interfaces are splined
There are 2 common disc brake mounting interfaces – splined and six-bolt. Splined rotors fit on splined hubs; six-bolt rotors will need an adapter to fit on six-bolt hubs. The six-bolt method is easier to maintain and may be preferred by many cyclists. If you’re thinking of installing a disc brake system, it is important to know how to choose the right splined and center lock interfaces.
The splines used for spline coupling in aircraft are highly complex. While some previous researches have addressed the design of splines, few publications have tackled the problem of misaligned spline coupling. Nevertheless, the accurate results we obtained were obtained using dedicated simulation tools, which are not commercially available. Nevertheless, such tools can provide a useful reference for our approach. It would be beneficial if designers could use simple tools for evaluating contact pressure peaks. Our analytical approach makes it possible to find answers to such questions.
The design of a spline coupling for aerospace applications must be accurate to minimize weight and prevent failure mechanisms. In addition to weight reduction, it is necessary to minimize fretting fatigue. The pressure distribution on the spline coupling teeth is a significant factor in determining its fretting fatigue. Therefore, we use analytical and experimental methods to examine the contact pressure distribution in the axial direction of spline couplings.
The teeth of a spline coupling can be categorized by the type of engagement they provide. This study investigates the position of resultant contact forces in the teeth of a spline coupling when applied to pitch diameter. Using FEM models, numerical results are generated for nominal and parallel offset misalignments. The axial tooth profile determines the behavior of the coupling component and its ability to resist wear. Angular misalignment is also a concern, causing misalignment.
In order to assess wear damage of a spline coupling, we must take into consideration the impact of fretting on the components. This wear is caused by relative motion between the teeth that engage them. The misalignment may be caused by vibrations, cyclical tooth deflection, or angular misalignment. The result of this analysis may help designers improve their spline coupling designs and develop improved performance.
CZPT polyimide, an abrasion-resistant polymer, is a popular choice for high-temperature spline couplings. This material reduces friction and wear, provides a low friction surface, and has a low wear rate. Furthermore, it offers up to 50 times the life of metal on metal spline connections. For these reasons, it is important to choose the right material for your spline coupling.
A spline coupler is a device used to connect splined shafts. A typical spline coupler resembles a short pipe with splines on either end. There are 2 basic types of spline coupling: single and dual spline. One type attaches to a drive shaft, while the other attaches to the gearbox. While spline couplings are typically used in racing, they’re also used for performance problems.
The key challenge in spline couplings is to determine the optimal dimension of spline joints. This is difficult because no commercial codes allow the simulation of misaligned joints, which can destroy components. This article presents analytical approaches to estimating contact pressures in spline connections. The results are comparable with numerical approaches but require special codes to accurately model the coupling operation. This research highlights several important issues and aims to make the application of spline couplings in high-performance vehicles easier.
The stiffness of spline assemblies can be calculated using tooth-like structures. Such splines can be incorporated into the spline joint to produce global stiffness for torsional vibration analysis. Bearing reactions are calculated for a certain level of misalignment. This information can be used to design bearing dimensions and correct misalignment. There are 3 types of spline couplings.
Major diameter fit splines are made with tightly controlled outside diameters. This close fit provides concentricity transfer from the male to the female spline. The teeth of the male spline usually have chamfered tips and clearance with fillet radii. These splines are often manufactured from billet steel or aluminum. These materials are renowned for their strength and uniform grain created by the forging process. ANSI and DIN design manuals define classes of fit.
Disc brake mounting interfaces
A spline coupling for disc brake mounting interfaces is a type of hub-to-brake-disc mount. It is a highly durable coupling mechanism that reduces heat transfer from the disc to the axle hub. The mounting arrangement also isolates the axle hub from direct contact with the disc. It is also designed to minimize the amount of vehicle downtime and maintenance required to maintain proper alignment.
Disc brakes typically have substantial metal-to-metal contact with axle hub splines. The discs are held in place on the hub by intermediate inserts. This metal-to-metal contact also aids in the transfer of brake heat from the brake disc to the axle hub. Spline coupling for disc brake mounting interfaces comprises a mounting ring that is either a threaded or non-threaded spline.
During drag brake experiments, perforated friction blocks filled with various additive materials are introduced. The materials included include Cu-based powder metallurgy material, a composite material, and a Mn-Cu damping alloy. The filling material affects the braking interface’s wear behavior and friction-induced vibration characteristics. Different filling materials produce different types of wear debris and have different wear evolutions. They also differ in their surface morphology.
Disc brake couplings are usually made of 2 different types. The plain and HD versions are interchangeable. The plain version is the simplest to install, while the HD version has multiple components. The two-piece couplings are often installed at the same time, but with different mounting interfaces. You should make sure to purchase the appropriate coupling for your vehicle. These interfaces are a vital component of your vehicle and must be installed correctly for proper operation.
Disc brakes use disc-to-hub elements that help locate the forces and displace them to the rim. These elements are typically made of stainless steel, which increases the cost of manufacturing the disc brake mounting interface. Despite their benefits, however, the high braking force loads they endure are hard on the materials. Moreover, excessive heat transferred to the intermediate elements can adversely affect the fatigue life and long-term strength of the brake system.