Injection Mold Making Moulding

Injection Mold Making Moulding refers to the process of processing raw materials such as mold steel into special tools with specific structures such as cavities, gating systems, and cooling systems through a series of precision processing technologies according to the design requirements of plastic products. These manufactured molds can be used in the plastic injection molding process. After injecting molten plastic into the cavity, plastic products that meet the design specifications are obtained through cooling and solidification. Injection Mold Making Moulding is a key link connecting plastic product design and mass production, and its precision and quality directly determine the performance, appearance and production efficiency of plastic products.

P&M Injection Mold Making Moulding Introduction

Core Process of Injection Mold Making Moulding

1. Mold Design

Mold design is the core pre-link of Injection Mold Making Moulding, which requires detailed planning based on the 3D model of plastic products (created by software such as SolidWorks and UG). The design content includes: cavity and core design (ensuring complete matching with the shape and internal structure of plastic products, and reserving a reasonable plastic shrinkage rate, such as 1.5%-2% shrinkage for PP materials); gating system design (determining the position and size of the sprue, runner and gate to ensure uniform filling of the cavity with molten plastic); cooling system design (arranging cooling water channels according to the thickness and shape of the product to control the uniformity of cooling speed and avoid product deformation); ejection system design (selecting ejection components such as ejector pins and ejector sleeves to ensure smooth demolding of the product); guiding and positioning system design (setting guide pillars and guide bushes to ensure accurate positioning when the mold is opened and closed). After the design is completed, mold flow analysis software (such as Moldflow) is used to simulate the injection molding process, optimize the design scheme, and reduce the cost of subsequent mold trial adjustments.

2. Raw Material Preparation and Pretreatment

The commonly used raw material for injection molds is mold steel, which should be selected according to the mold purpose and plastic product characteristics: for example, H13 hot work mold steel with strong wear resistance is selected for molds producing large-batch and high-precision products; P20 pre-hardened mold steel with easy processing is selected for molds producing small and medium-sized products with medium precision. In the raw material preparation stage, the mold steel needs to be cut, and the entire steel block is cut into blanks close to the size of mold parts by a sawing machine or laser cutting equipment to reduce the subsequent processing allowance. The pretreatment links include annealing treatment (heating the mold steel to a specific temperature, keeping it warm and then cooling it slowly to reduce the material hardness and eliminate internal stress for subsequent cutting processing) and surface rust removal (using sandblasting or pickling to remove the oxide scale and rust on the steel surface to ensure processing precision).

3. Precision Machining

（1）CNC Milling Machining

Vertical or horizontal CNC milling machines are used for rough machining and semi-finishing of mold blanks to remove most of the excess material and initially form the shape and structure of mold parts (such as the plane, step and groove of the template). During processing, appropriate tools should be selected according to the hardness of the mold steel (such as high-speed steel tools for processing soft mold steel and cemented carbide tools for processing pre-hardened mold steel), and reasonable cutting parameters (cutting speed, feed rate, depth of cut) should be set to ensure processing efficiency and surface roughness (usually the surface roughness Ra≤6.3μm after semi-finishing).

（2）EDM Machining

For complex shapes or deep cavity structures such as mold cavities and cores, Electrical Discharge Machining (EDM) is used for precision forming. This process uses the pulse discharge between the electrode and the workpiece to generate high temperature, erode the workpiece material, and realize the processing of complex shapes. Before processing, an electrode complementary to the shape of the cavity (usually copper or graphite material) needs to be made, and the electrode movement trajectory is controlled by the numerical control system. The EDM precision can reach ±0.005mm, and the surface roughness Ra≤1.6μm, which can effectively process complex structures that are difficult to reach by traditional milling, such as narrow gaps and sharp corners.

（3）Wire EDM Machining

Wire Electrical Discharge Machining (Wire EDM) is mainly used for processing parts such as special-shaped holes, punches and dies of molds, especially for the processing of thin mold parts or high-precision contours. This process uses wire electrodes such as molybdenum wire as tool electrodes, and erodes materials through discharge between the wire electrode and the workpiece, and realizes the cutting of complex contours with the numerical control system. The wire EDM precision can reach ±0.002mm, and the surface roughness Ra≤0.8μm. There is no mechanical stress during the processing, which can avoid workpiece deformation. It is often used for the processing of key parts such as mold cutting edges and precision guide holes.

（4）Polishing and Lapping

In order to improve the surface finish of the mold cavity (which directly affects the surface quality of plastic products), the processed mold parts need to be polished and lapped. Coarse polishing uses tools such as grinding wheels and oilstones to remove processing marks; medium polishing uses sandpaper (such as 400#-1000#) to further refine the surface; fine polishing uses diamond grinding paste (such as W1-W5 particle size) and is processed by manual or mechanical polishing equipment (such as ultrasonic polishing machine) to make the surface roughness of the cavity reach Ra≤0.025μm, meeting the surface requirements of transparent or high-gloss plastic products. For molds with texture requirements (such as leather texture and wire drawing texture), surface textures need to be made through chemical etching or laser engraving processes.

4. Mold Assembly

Mold assembly is the process of combining and installing the processed mold parts (such as fixed mold base plate, moving mold base plate, cavity, core, guide pillar, guide bush, ejection component, etc.) according to the design drawings. The assembly steps include: first, fixing the cavity and core on the fixed mold core and moving mold core to ensure accurate positioning (positioning through pins, with a fitting gap ≤0.005mm); then installing the guiding system, pressing the guide pillars into the moving mold base plate and the guide bushes into the fixed mold base plate to ensure smooth fitting between the guide pillars and guide bushes; then assembling the ejection system, installing components such as ejector pins and ejector sleeves on the ejection plate, adjusting the ejection stroke to ensure synchronous ejection action; finally, installing the accessories of the gating system and cooling system (such as gate sleeves and water pipe joints), and checking whether the movement of each component is flexible without jamming. After the assembly is completed, air tightness testing (testing whether the cooling water circuit leaks) and dimension review before mold trial are required to ensure that the mold assembly precision meets the requirements.

5.Mold Trial and Adjustment

Mold trial is a key step to verify mold performance and optimize the injection molding process. The assembled mold needs to be installed on the injection molding machine, and injection molding tests are carried out according to the preset injection parameters (temperature, pressure, speed, etc.). During the mold trial, it is necessary to observe: the filling situation of molten plastic (whether there are problems such as material shortage, flash, bubbles, etc.); the dimensional precision of the product after cooling (detecting key dimensions through a coordinate measuring machine and comparing with the design value); the appearance quality of the product (whether there are scratches, shrinkage marks, color differences on the surface). According to the mold trial results, adjust the mold: if there is a material shortage problem, the gate size can be increased or the injection pressure can be increased; if the product is deformed, the cooling water circuit layout needs to be optimized; if there are shrinkage marks on the surface, the pressure holding time needs to be extended. Usually, 2-3 mold trials and adjustments are required until qualified plastic products are produced, and then the mold can be put into formal production.

P&M Injection Mold Making Moulding(Specification)

Customization Process

Factory&About US

NingBo Plastic Metal Product Co.,Ltd (P&M) is located in Yuyao, the so-called Mould City, Plastic Kingdom, in the southern tip of Hangzhou Bay Bridge,north of Shanghai, the east of Ningbo Port,tight double line of State Road 329 on land, sea and air trafic into a network to facilitate transport.

By the abundant technical strength,scientific management methods and good after-sales service, product deeply trusted and welcomed by customers from all over the world. P&M holds improved system of development and production, to achieve mold design, plastic products manufacturing and automatic production. Our main products is design and manufacturing of plastic mold, plastic product, metal product. 90% products of our enterprise are exported to America, Europe, Germany, Japan, Australia, etc. For many years, the company has been committed to the research of raw materials. The company has its own trademark and dozens of patents, providing more convenient technical support for mold making and product production. P&M started domestic business from 2008,named Shundi Mould Factory. And opened the international market from 2014. We always adhere to the principles of quality first and time first. While providing customers with the highest quality products, try to maximize the production efficiency and shorten production time. We are proud to tell every customer that our company has not lost any customer since its establishment.If there is a problem with the product, we will seek a solution actively and take responsibility to the end.

P&M adheres to market-oriented to the quanlity of life and focus on quality service and continuous development of new products,determined to establish a better corporate image,and our friends at home and abroad to carry a wide range of business exchanges and cooperation, create brilliant.

Packing

Packaging according to your needs

1. By air ,it takes 3-7 days for delivery.

The goods can be shipped by DHL , Fedex , UPS .

2. By sea ,the delivery time is based on your port.

To South East Asian Countries takes about 5-12 days.

To Middle east countries takes about 18-25 days.

To European countries takes about 20-28 days.

To American countries takes about 28-35 days.

To Australia takes about 10-15 days.

To African countries takes about 30-35 days.

P&M Bike parts, centered around children, balances safety, health, and fun, aiming to add a bright color to children's beautiful childhood. We look forward to working together with you to serve our children.

The path of a child's growth is paved with bricks and tiles.

FAQ

1.Who are we?

We are based in Zhejiang, China, start from 2014,sell to North America(30.00%),Southern Europe(10.00%),Northern Europe(10.00%),Central America(10.00%),Western Europe(10.00%),Mid East(10.00%),Eastern Europe(10.00%),South America(10.00%). There are total about 51-100 people in our office.

2.How can we guarantee quality?

Always a pre-production sample before mass production;

Always final Inspection before shipment;

3.What can you buy from us?

Mould, Plastic Product, Metal Product, Dental Product, CNC machining.

4.Why should you buy from us not from other suppliers?

We main do all kinds of 3d design, 3d printing and plastic metal molds tooling and products. We have our own engineer and factory. One-stop supply: 3d design - 3d printing - mold making - plastic injection.

5.What services can we provide?

Accepted Delivery Terms: FOB,CFR,CIF,EXW,FCA,DDP,DDU;

Accepted Payment Currency: USD, EUR;

Accepted Payment Type: T/T,L/C,PayPal,Western Union,Escrow;

Language Spoken:English,Chinese,Spanish,French,Russian.

6.What are the characteristics of your service?

1. Your inquiry related to our products or prices will be replied within 24 hours.

2. Well-trained and experienced staffs to answer all your enquiries in fluent English.

3. Offering the support to solve the problem in the application or selling period.

4. Competitive prices based on same quality.

5. Guarantee samples quality same as mass production quality.