China injection mold design
Injection molding is a common method for mass production and is often preferred. over other processes, given its capability to economically make complex parts to tight tolerances. Before any parts can be molded, however, a suitable,injection mold must be designed.
Once a quote is accepted, the detailed engineering design of the mold can begin in earnest as indicated by the listed steps on the under side of picture.Before the injection mold design, we must first understand the basic information of the part,This information is very important for our next design.First, the mold designer will lay out the injection mold design by specifying the type of mold, the number and position of the mold cavities, and the size and thickness of the mold,Afterwards, each of the required sub-systems of the mold is designed.
How to do an injection mold design ?
Once the parting line is identified, the parting plane is projected outwards from the part so as to separate the core insert from the cavity insert.
Parting plane design requirements
To avoid excessive stress, interlocking features on the parting plane should be inclined at least five degrees relative to the mold opening direction.
These surfaces may be directly machined using computer numerically controlled (CNC) machining.
All sides and radii not shutting off must be cleared.
Verify that required cutter size will cut pocket correctly at corner.
Design pocket with drilled corners whenever possible to avoid adding radii to inserts.
Whenever using a cutter in a corner, use 60% of tool diameter for corner radius. Example: if using a 0.500” diameter cutter, do not use a 0.250” corner radius, use a 0.300” corner radius.
Mold layout design requirements
The goal of cavity layout design is to produce a mold design that is compact, is easy to manufacture, and provides molding productivity. If a single cavity mold is being designed, then the cavity is typically located in the center of the mold, though
gating requirements may necessitate placing the mold cavity off center.
The cavity layout needs to be determined according to the size of the injection molding machine.
The cavity layout needs to be determined according to the Feed system.
The cavity layout needs to be determined according the mold Structural.
Slider system design requirements
All slide designs/type are determined by the part shape. Mechanical slides are preferred over hydraulic slides. This will be determined at the initial mold review.Mechanical slides should be located on operator or non-operator side and bottom.
Is slide stroke adequate
Is the forward and back limit stopper adequate
Slide located on the top of the mold have strong slide locks and need to add spring.
Is slide travel adequate to clear part
Is a positive slide lock designed in the tool
Are there wear plates under the slide
Are there wear plates in the lock blocks
Are limit switches present in case of "slide rebound
On slides wrapping around cores, is there adequate clearance between ejector devices and slide steel
Are there early return pins (.25" minimum diameter) provided when ejector devices are under slide steel
Are slides removable without disassembling the mold frame
Are grease grooves designed in sliding areas Are slides locked against "blow back
Lifter system design requirements
The lifter is a feature incorporated into the molding section of injection molding. Different mold makers also have different approaches to design and fabricate the lifters.
The travel angle of the lifter should not be more than 12 degrees.
Is the angle of the lifter OK
The lifter don't interferes with the ejection pin during ejection
Whether model will stick to the lifter and move with the lifter when it is ejected.
We currently employ12 designers, most of whom have actual tool shop experience. This experience gives our designers a “real world” concept of mold making and the information necessary for quality designs. We design to our customers’ standards and specifications in conjunction with our own internal processes and procedures to ensure every design meets or exceeds our customers’ expectations.
