Question 1

What is a mandrel tube bender?

Accepted Answer

A mandrel tube bender is one type of tube bender (A tube bender is a machine that is used to bend tubes into different shapes), designed to avoid the issue of wrinkling along the inside of pipes and tubing. The mandrel stays in a fixed position as the outer radius of the tube experiences pressure. This pressure causes the pipe to stretch into the desired bend. and the mandrel tube bending machine is a tube bender with mandrel to support the inside of the tubes during the bending process. A tube bender uses dies to bend tubes and mandrel is one the components of dies of mandrel tube benders. The mandrel of hydraulic mandrel tube bender is a metal rod and there are various types of mandrels of mandrel tubing tube bender that can be chosen according to diameter and thickness of the pipe, bending radius of the pipe and material of the pipe: cylindrical mandrel, universal ball head mandrel and universal multi-section mandrel and so on. A tube bender that contains any of these mandrels is called Pipe bending machine china 168NC-DW.

Question 2

What is the purpose of mandrel in tube bending?

Accepted Answer

In the case of individual bending, the tube with outer diameter D and wall t ess S is bending under the force of outer frame. The outer wall tube is thinned by the work of pulling, but the inner tube wall is thickened by the work of pressure σ.(See Figure 1a). The cross section of tube bend is change into a shape of oval through the resultant force F1 and F2. (See Figure 1b). The inner wall tube may be wrinkled due to loss of stability (See Figure1c). To avoid these situations, we should take some corresponding measures. For example, mandrel bender is one of the most commonly used and effective methods.

Question 3

How to extending the service life of pipe bending machine?

Accepted Answer

All people who have operated the pipe bender can know about that the machine will be worn after long time of use. But we can use the following methods to reduce wear:
1. The operators must keep the machine clean. If there are any sundries on the machine can affect the operation of the machine.
2. In order to guarantee working and extending the service life of the machine, before operate the tube bender, the workers must undergo strict training and practice. Only the operators be familiar with the operation process and performance of the machine can solve some emergencies when bending.
3.In order to protect the dust cover, operators should usually clean iron filings behind the guide rail. For the full-automatic tube bender,operators should add new smoothing agent to exit track every week.
4. The operators should replacement parts with severe wear in times to improve work efficiency. To add lubricants to machine parts, it can guaranteed lubrication performance of the machine.
Figure 1: the force and change when tube bending. (a)
The force when the tube disorderly change. (b)
The cross section change when tube bending.(c)
The inner tube wall wrinkle when tube bending.Sometimes the relative bending radius R/D is small or relative wall thickness S/D is small during production. Under such conditions, in order to produce high-quality tube ,we will insect a suitable mandrel to avoid flattening and wrinkling at arc when bending. This process is called mandrel bend.(See Figure2)

Question 4

How does a mandrel bender work?

Accepted Answer

The mandrel tube benders has a additional mandrel as one of the components of the mandrel tube bender dies, thus, the mandrel tube bender dies include bending die, pressure die, clamping die, mandrel and wiper die (sometimes it’s not necessary the use of wiper die).
The function of the mandrel of the tube bender with mandrel is supporting the inside of the pipes during the bending process. The bending die and pressure die of the rotary mandrel tube bender clamp the pipe, the bending die rotates and the pressure die moves with the bending die. During this movement the bending die and the pressure die clamp the pipe firmly and the pipe changes its shape because of the force received. Sometimes the force causes unnecessary deformation of the pipe, specifically when the diameter of the pipe is big and the thickness of the pipe is small, in this case, the mandrel tube bender is needed to do the perfect bending work. The mandrel supports in the inside of the pipe while the bending die rotates so that the bending part can maintain its roundness. The function and working principal of the mandrel is the same for the cnc mandrel tube bender and the hydraulic mandrel tube bender.

Model	unit	168NC-DW
Maximum bending tube diameter×wall thickness	mm	168×14
Maximum bending radius	mm	R750
Minimum bending radius	mm	R≥1.5D
Maximum bending angle	Degreee	190°
Standard mandrel pulling length	mm	5000
Control System		Microcomputer control
Number of bends allowed for pipe fittings	Unit	16
Number of parts that can be stored	Unit	16×16
Motor power of oil pressure	KW	22
Maximum system pressure	Mpa	16
Hydraulic system control		Solenoid valve
Tank volume	L	650
Overall dimension Machine	mm	7100x2000x1800
Machine weight	Kg	12000

Pipe bending machine china 168NC-DW

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