Why do you choose to withdraw mandrel in advance
Home » News and Events » Hydraulic Pipe Tube Bender » Why do you choose to withdraw mandrel in advance

Why do you choose to withdraw mandrel in advance

Views: 8     Author: Site Editor     Publish Time: 2022-10-26      Origin: Site Inquire

Why do you choose to withdraw mandrel in advance


When bending the pipe, the pipe bender will use the mandrel as the inner support of the pipe in order to prevent the pipe from wrinkling and deformation. In the system programming of pipe bending machine, there will be a data parameter "advance mandrel withdrawal angle". What is the advance mandrel withdrawal angle? Advance core withdrawal angle, in fact, is to set an angle can make the mandrel in the bending pipe forming before the backward convenient last piece. So when do you need to use this data?


The mandrel of cnc pipe bending machine can be divided into single ball and multiple balls. For single ball or few balls, this parameter can not be set, because the mandrel is not far away (Figure 1).


Figure 1 Single and less ball mandrel using

Figure 1 Single and less ball mandrel


The shape deformation after the end of bending does not have much influence on the mandrel withdrawal, so it is OK to set the value to 0, and the mandrel withdrawal action can be carried out after the complete completion.


Figure 2 Multi - ball mandrel

Figure 2 Multi - ball mandrel


If the mandrel structure is multi-ball (Figure 2).It can be seen that in order to prevent deformation, the new baseball needs too much deep bending, so it is difficult to take out the pipe after shaping.


However, it is not necessary to wait for the pipe to be completely shaped before the withdraw mandrel action is carried out. As shown in the figure, the final curve of the pipe is 90 degrees, and the value can be set to about 28 degrees before the withdraw mandrel action can be carried out, as shown in Figure 3. It is much easier to remove the mandrel if the bending is not completed as shown in the picture.


Figure 3 Angle of early core withdrawal of multi - ball mandrel

Figure 3 Angle of early mandrel withdrawal of multi - ball mandrel

Product Category

Inquiry Now
Nanjing BLMA Machinery Co.,Ltd is a leader manufacuture of CNC metal sheet and tube processing equipments.

Quick Links

Product Category

Contact Us

    Sales : Andrew Xia
   E-mail : andrew@chinablma.com
    Mobile/Wechat/Whatsapp :
       +86-19556628578

Tawk.to - Online

Copyright  1987 -2022 Nanjing BLMA Machinery Co., Ltd. All rights reserved.