Mold Structure: Rotating Core Pull and Dual Slide Core Pull – How to Solve It?

Mold Structure: Rotating Core Pull and Dual Slide Core Pull – How to Solve It?

Today, let’s take a look at a three-way pipe fitting product. Due to its relatively complex structure, the mold design in terms of parting line selection and demolding method becomes quite challenging.

Let’s explore together how to design the mold for this kind of product.

01 Product Structure

The structure of the three-way pipe fitting product is shown in the figure below.

As shown in the image above, the key feature of this mold lies in the demolding structure for the outer sides of the three inclined columns. If we apply a conventional approach, no matter from which direction the core is pulled, interference will occur between the slide blocks.

We often talk about relatively complex mold structures such as "rotary core pulls" or "dual-action slide core pulls." So why not consider a rotary mold opening or even a dual rotary mold opening? In fact, it was precisely this rotary mold opening method that made the molding of this three-way pipe fitting possible.

02 Mold Structure

First, determine a rotation center and draw the first set of slide blocks.

The slides rotate outward on both sides, but before that, the inner core pins (or inserts) must be pulled out   first.

Single Slide Block Diagram:

Effect after rotary alignment:

During mold opening, Group A rotates 35° first, then Group B rotates 15°.

When closing the mold, Group B closes first, followed by Group A.

The two groups cannot move at the same time.

The detailed motion sequence is shown in the animation below:

Actually, the mold structure is not the only option. Let’s take a look at another ejection solution.

03 Mold Motion Animation

The dynamic demonstration of the motion sequence is shown in the figure below.

We hope this can serve as a reference for similar products.