China wholesaler High Precision Qualified 3K Power Tool Housing Molded Part injection molding machine parts and functions

Product Description

LJ Mold has rich experience in automotive parts, power tool parts, farming machinery parts, household appliances, child seat products molds manufacture and molding production.

-We have full set of advanced equipments: CNC High speed machining centers, EDMs, CNC lathes, Large milling machines, grinding machines, Deep-hole drilling machines.

Established time Employees Advanced equipments Export mold’s experience Annual mold capacity Injection machine quantity
1996 120 70 sets 25 years 600 sets 30 sets

Strong Design team

DFM- Design For Manufacturability

Design study – Project Management

High Speed CNC machining center

Professional polishing

Mold fitting (3 groups in Assembly room)

Sampling Room-23 sets Injection machines (60T~3000T)

Final inspection prior to mold shipping

Painting per customer request and packing

Deliver to HangZhou port base on FOB terms


1-Where are your molds exported?
Most of our molds are exported to USA, Canada,Germany,Czech,France, UK and so on.

2-How long do you evaluate the price after you receive the RFQ?
Normal we provide the quotation to the customer in 3 working days; if the project is very urgently, then we will try our best to provide it within 1 day.

3-What kind of requirements do you need when making a quotation?
For mould manufacturing
2D/3D Part Drawing,Cavity number, Type of Hot runner and No., Type of mold steel, standard(ie.DME, Hasco etc), Plastic material in uses, any special design enquired from customer

For production (in house mould)
Annual production amount, Plastic material details; Inspection requirements.

For production (mould transfer from customer)
2D part drawing with detail dimension shown, Mould drawing, Plastic material details, Part and runner weight, Mold age, Cycle time, Samples, Inspection requirement, other special requirements.

4-What type of software do you use?
We are using Pro-E, UG ,CAD and so on.

5-How many days do you work per week?
We are working 6 days per week. CNC, EDM and Polishing Departs, 2 shifts. 10H/shift. Mold shop depends on the emergency.

6-What’s property of your company?
Private factory.

7- What materials are you molding most often?
ABS, PP, PC, PA, PA6+GF,PVC,POM, PBT, PPO, PE, TPE, U-PVC, and so on.

8 – What type of formats do your mold drawings use often?
We often use .dwg, .step, .prt and .igs also.

9 – What kind of hot-runner do you use?
Usually we use Mold-Master,Synventive, Incoe, YUDO, Hasco, HRS,D.M.E., Husky and so on.

10-What kind of services will you do when you ship the mold?
About the Ex-factory moulds, we will provide the following services before shipping. 
1). We will pack the mould with an insecticidal wood case, and fix it with iron frame.
2). We will put the electrodes and the spare parts which are easy damaged into the wood case together. 
3). We will send all the related drawings of Mould, Data and Steel Certifications together with the moulds.

11- Do you provide the testing samples for free?
We supply 5~10 pieces samples to customer for free, but the freight is collected. Totally about 3 times of testing, it is up to the part structure.

12-What will you do if your mold has the quality problem after shipping to the customer?
First, we will check the problem and analyze all kind of reasons. If it is our fault, we will pay all the cost without any bargain or remake the new component or mold to the customer. If it is both problem, then both take the responsibility. If it is the customer’s problem, then the customer should take it.


Shaping Mode: Injection Mould
Surface Finish Process: Heat Treatment
Mould Cavity: Multi Cavity
Plastic Material: PA66+GF
Process Combination Type: Compound Die
Application: Household Appliances, Electronic, Home Use, Industrial
US$ 1/Piece
1 Piece(Min.Order)

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Customized Request

Injection molded partt

Importance of Wall Thickness in Injection Molded Parts

When designing injection molded parts, it is important to keep the wall thickness uniform. Uneven wall thickness can lead to warping and sinking. To minimize these problems, injection molded parts should have a wall thickness of 40 to 60 percent of the adjacent wall. The thickness of the wall should also fit within the range recommended for the resin that is being used. If the wall thickness is too thick, it should be cored out. Unnecessary wall thickness alters the dimensions of the part, reduces its strength, and may require post-process machining.

Designing out sharp corners on injection molded parts

Designing out sharp corners on injection molded components can be a challenging process. There are several factors to consider that impact how much corner radius you need to design out. A general rule is to use a radius that is about 0.5 times the thickness of the adjacent wall. This will prevent sharp corners from occurring on a part that is manufactured from injection molding.
Sharp corners can obstruct the flow of plastic melt into the mold and create flaws on parts. They can also cause stress concentration, which can compromise the strength of the part. To avoid this, sharp corners should be designed out. Adding radii to the corners is also an effective way to avoid sharp angles.
Another common problem is the presence of overhangs. Injection molding parts with overhangs tend to have side-action cores, which enter from the top or bottom. As a result, the cost of making these parts goes up quickly. Moreover, the process of solidification and cooling takes up more than half of the injection molding cycle. This makes it more cost-effective to design parts with minimal overhangs.
Undercuts on injection molded parts should be designed with a greater radius, preferably one or two times the part’s wall thickness. The inside radius of corners should be at least 0.5 times the wall thickness and the outside radius should be 1.5 times the wall thickness. This will help maintain a consistent wall thickness throughout the part. Avoiding undercuts is also important for easy ejection from the mold. If undercuts are present, they can cause a part to stick inside the mold after it has cooled.
Keeping wall thickness uniform is another important issue when designing plastic parts. Inconsistent wall thickness will increase the chance of warping and other defects.

Adding inserts to injection molded parts

Adding inserts to injection molded parts can be a cost-effective way to enhance the functionality of your products. Inserts are usually manufactured from a wide range of materials, including stainless steel, brass, aluminum, bronze, copper, Monel, nickel/nickel alloy, and more. Selecting the right material for your parts depends on the application. Choosing the correct material can help prevent defects and keep production cycles short. The insert material should be durable and resist deformation during the injection molding process. It must also be thin enough to provide the desired grip and have a proper mold depth.
The benefits of adding inserts to injection molded parts include the ability to design parts with unique shapes. These parts can be aesthetically pleasing, while still remaining durable and resistant to wear and tear. In addition, insert molding allows products to have a good external finish. In addition to being cost-effective, insert molding is considered a more efficient manufacturing method than other conventional methods.
Adding inserts to injection molded parts is an excellent way to enhance the strength and performance of your products. There are many different types of inserts, including threaded nuts, bushings, pins, and blades. Some types are even available with knurled outer surfaces that help them adhere to plastic.
In addition to being cost-effective, insert molding is environmentally friendly and compatible with many types of materials. Typical inserts are made of metal or plastic. Depending on the application, stiffening inserts may also be made from wood.

Importance of uniform wall thickness

Injection molded partThe uniformity of wall thickness is an essential factor in the plastic injection molding process. It not only provides the best processing results, but also ensures that the molded part is consistently balanced. This uniformity is especially important for plastics, since they are poor heat conductors. Moreover, if the wall thickness of an injection molded part varies, air will trap and the part will exhibit a poorly balanced filling pattern.
Uniform wall thickness also helps reduce shrinkage. Different materials have different shrinkage rates. For instance, thick parts take longer time to cool than thin ones. As the part’s thickness increases, cooling time doubles. This relationship is due to the one-dimensional heat conduction equation, which shows that heat flows from the center of the part toward the cooling channel. However, this relationship does not hold for all types of plastics.
The general rule for maintaining uniform wall thickness in injection molded parts is that walls should be no thicker than 3mm. In some cases, thicker walls can be used, but they will significantly increase production time and detract from the part’s aesthetic appeal and functionality. Furthermore, the thickness of adjacent walls should be no thicker than 40-60% of each other.
The uniformity of wall thickness is critical to the overall quality and efficiency of the injection molding process. An uneven wall thickness can cause twisting, warping, cracking, and even collapse. A uniform wall thickness also reduces residual stress and shrinkage. Injection molded parts are more stable when the wall thickness is uniform.
An injection molded part with thick walls can be problematic, especially when the molded parts are shaped like a cube. A non-uniform wall thickness can result in problems and costly retooling. Fortunately, there are solutions to this problem. The first step is to understand the problem areas and take action.

Using 3D printing to fabricate molds

splineshaftThe use of 3D printed molds allows manufacturers to manufacture a wide range of injection molded parts. However, 3D-printed molds are not as strong as those made from metallic materials. This means that they do not withstand high temperatures, which can degrade them. As such, they are not suitable for projects that require smooth finishing. In order to reduce this risk, 3D-printed molds can be treated with ceramic coatings.
Using 3D printing to fabricate injection molds can help reduce costs and lead times, allowing manufacturers to bring their products to market faster. This process also has the advantage of being highly efficient, as molds made using 3D printing can be designed to last for many years.
The first step in fabricating an injection mold is to design a design. This design can be complex or simple, depending on the part. The design of the mold can be intricate. A simple example of a mold would be a red cup, with an interior and exterior. The interior portion would have a large cone of material protruding from the other side.
Injection molding is an effective way to produce thousands of parts. However, many engineering companies do not have access to expensive 3D printers. To solve this problem, companies should consider using outside suppliers. In addition to speeding up the manufacturing process, 3D printing can reduce the cost of sample parts.
Plastic injection molding still remains the most popular method for high volume production. However, this process requires a large up-front capital investment and takes a while to adapt. Its advantages include the ability to use multiple molds at once, minimal material wastage, and precision dosing. With an increasing number of materials available, 3D printing can be a smart option for companies looking to manufacture a variety of plastic parts.
China wholesaler High Precision Qualified 3K Power Tool Housing Molded Part   injection molding machine parts and functionsChina wholesaler High Precision Qualified 3K Power Tool Housing Molded Part   injection molding machine parts and functions
editor by CX 2023-04-18