Injection mold during the manufacturing process should satisfy some conditions

Injection mold in the processing according to the process specification produced by the injection mold products should reach all the precision required by the design drawings, quality requirements, and can be mass-produced parts of qualified products. During the manufacturing process, and strive to shorten the production cycle, the development of rational processing procedures, the preparation of the scientific process standards, economic and rational use of equipment, the single-piece production into mass production, the implementation of a set of processing technology.

Rational use of materials to reduce the cost of injection mold, injection mold manufacturer cycle reduction efforts to improve the life of the injection mold, making the adoption of new technology to be adjusted according to actual conditions in order to improve production efficiency injection molds and reduce costs. In the mold making noise shall not exceed national standards, as well as the release of toxic gases.

Injection mold maintenance mode

Injection mold is a tool for producing plastic products, plastic products also give the exact dimensions of the complete structure and tools. To process the ideal injection mold products, they need to do daily maintenance work on the injection mold, injection molding below describe in detail the maintenance of way.

To attach importance to the maintenance of the plastic injection mold surface, which directly affect the surface quality of the product, focusing prevent corrosion, therefore, the choice of a suitable, high-quality, professional anti-rust oil is particularly important. When the mold to complete production tasks, you should take a different approach depending on the injection carefully remove residual injection, the available copper rod, copper wire and professional mold cleaning agents remove residual injection mold and other deposits, and then air-dried. Disable wire, steel bars and other hard objects to clean up, so as not to scratch the surface. If rust corrosion caused by injection, to use the grinder polishing and spray on a professional anti-rust oil, and then the mold in a dry, cool, no dust at the store.

Plastic Injection Mold for water tank cover on Automobile

This is a single cavity plastic injection mold WIT MOLD built for our American customer MPC.part material is PP, and part weight is 320g, the mould size is 850X600X500mm,and the mould weight is 1500kg. The build time is 40 days. After the second mold trial, the customer approved the mold for shipping.

Mechanical actions includes two mechanical sliders in the core and one spring block in the cavity.It is sprue gate. In order to keep the cooing balance, we also bring cooling channel into all mechanical actions.

Before the mold manufacturing, our mould designer analyzed the part filling, packing pressure, and deformation etc by using Moldflow analysis during the mould design. By studying the results of the moldflow analysis, we optimized the mould part and mould design. In this way, the cycle time was reduced from 50s to 38s, improved by 24%.

This is one of our successful projects we made recently, and visit blow link for more:http://www.witmold.com/references/Successful_projects/

Precision injection mold movements and use of the process of technical guidelines

More types of plastic injection mould, even if the same injection mold due to the different types of plastics molding, beginning with the accuracy requirements are different, assembly methods vary. Therefore, before the assembly should carefully analyze the role of research assembly diagram, parts diagram and the parts of the base assembly to be determined after the final round reached by assembling the quality indicators of the product.

Action precision injection mold process with the use of the technical requirements:

1 Assembly reference, assembly reference can be roughly divided into:

(1) Work with plastic parts such as the main core, cavity and insert quick reference as assembly parts, other parts of the mold assembly has formulated a reference parts and assemblies.

(2) To the template side of the base surface guide pins and bushings or mold assembly datum for trimming and assembly.

2 Die assembly accuracy, precision mold assembly includes:

(1) Each child accuracy of each parts and components, such as the distance between the dimensional accuracy, concentricity, equality, vertical and so on.

(2) The accuracy of the relative motion, such as the transmission precision linear motion and rotary motion accuracy.

(3) Contact with the accuracy and precision, such as with the gap, the amount of interference contact status.

(4) The size of the wall thickness of the plastic molding pieces when freshly mold, forming the lower limit of wall thickness should be somewhat size.

3 Repair principles:

(1) Repair stripping slope, in principle, should ensure that the large end of the size of the cavity in the workpiece size tolerance range should ensure that small core size carbonyl within the workpiece size tolerances.

(2) Radius corners, the cavity should be small, core should be larger

(3) When there should be corrected when both vertical parting surface of the mold parting surface level so that the true vertical parting surface at the level of sub-surface contact with a gap slightly. Gap value depending on the size of the mold, the mold just a small after contact with each other can be painted red, large die gap of about 0.02mm.

(4) For the injection mould, with a slant slant adhesion mold after parting surface should be left at the gap 0.02-0.03mm.

(5) Repair arc and a straight connection to a smooth surface, the surface does not allow any dents, cutting and filing mold lines should be consistent with the direction.

China domestic plastic moulds market grows by 15%~20% per year

Currently the market volume of plastic mold industry in China is very big and grows by by 15%~20% per year, which mainly benefits by the development of the end market such as automotive, household appliances ,packing, construction materials and daily necessities.

Every grade of these industry have a strong demand for plastic injection moulds. 90% of automotive processing needs moulds,90% of plastic product needs injection mold, lots of IT products need mould, therefore, these demands are promoting the development of the mould industry. By the statistics of relative industry research shows, the total plastic product output of China in 2012 is approaching 60 million tons and the amount is keep growing. It means the domestic demand gives great driving force to china mold industry.

China mould sales amount keep growing

In recent years, China mould industry keeps constantly developing and the sales amount of moulds is growing. From 2008 to 2013, the total output of plastic mould industry increased from 908 billion to 1845 billion, sales revenue increased from 86.1 billion to 181.6billion.The market is expanding and means the mould industry have broad prospects.

The development of smart technology give birth to those smart hand set such cell phone, pad, POS equipment and RFID. The smart equipment start to be used in more and more industries , to make the management of the enterprise more efficient. The sustainable development of mould industry needs the help of high technology, to goes to the mould industry have broad prospects.

Mould is called "mother of industry", it's the basic equipment of the industrial production.75% of semi-finished components and 50% finished components are produced by mould, also most of the plastic parts are shaped by mould. Mould industry is the basic industry of state economy, it relates to machinery, automotive, electronics, metallurgy, construction materials etc., with broad applications. The industry of China is rapidly expanding, especially the development of automotive and IT industry, brings the development opportunity for mold industry.

For the precision mold industry, if some one want to be the market leader, the must follow the development of the internet era, using the latest technology and equipment, actively search for the best solution for management and marketing channel, which is the best way of enterprise operation.

How to choose the injection mold-oriented parts?

Injection mold in the production process have to assemble and test machine when the transfer mode assurance that direction and position between the male and female mold, guide parts should withstand a certain lateral force, played a role in guiding and positioning. This time we will realize the importance oriented parts, injection molds guide body parts including guide pillars and covers. So we have to analyze the problem of how to choose the orientation of parts:

1.Oriented structure of the overall design

(1) The guide member should be reasonably uniformly distributed around or close to the edge portion of the mold, the center to edge of the mold should be a sufficient distance to ensure the strength of the mold, to prevent the deformation of the press-fit guide pin and the guide sleeve.

(2) The mold according to the shape and size of a die typically requires 2-4 pillar. If, when the die punch and the die mold with the orientation requirements, the two guide posts of different diameters, or two of the same diameter, but the column-shifted position.

(3) Since the plastic parts are usually left in the male mold, so that the guide post in order to facilitate releasing the mold is usually mounted on a mother.

(4) Should guide post and guide sleeve bearing at the parting plane of flutes

(5) The axis of guide pins and bushings and guide holes should ensure parallel

(6) When be the plastic mold, should ensure that the guide member First contact, avoid public mode first into the mold cavity, damaged molding parts.

2.Design guide post

(1) A single section and stepped points

(2) The length of the guide post must be higher than the male die end face 6-8mm

(3) Part guide column head should guide cone or spherical

(4) There are riveted and fixation screws

(5) The surface should be heat treated to ensure wear resistance.

3.Guide sleeve and the guide hole

(1) Pilot hole without guide bush, directly open the template, the template is thicker, the pilot hole must be made blind holes, increased sidewall vent

(2) Guide sleeve has a sleeve type `stepped` convex Desktop

(3) In order to successfully enter the guide sleeve guide post holes, pour in the guide sleeve should have a rounded front r.

Line marks on the injection mold products, how to repair?

In the injection mould products surface, if showing a line marks, we should judge it was gas welding marks or scars? Mainly due to gas mark is produced by injection mold exhaust caused by bad, relatively good workpiece surface, would appear to be more dark. mainly due to the weld line is generated by the intersection of the plastic in the mold cavity will produce the weld lines, weld lines are unavoidable, can be used to increase flow rate, temperature, pressure, and other methods of reducing the apparent surface of the weld line to meet the requirements needed.

Fix two marks on the injection mold products are as follows:

The place where there is gas mark do some inserts:

1 plus exhaust can vent inserts molded in inserts in public;

2 Improved plastic mouth, or mouth into the plastic to increase the flow channel dimensions increased stiffener

3 products plus glue, or bottom

4 using high-pressure low-speed injection

5 die temperature rises

Weld line is to follow up the plastic mouth piece in the monument opposite direction, by adjusting the position of the plastic injection mold product not played, the product was out of position tuned piece of gum rift rift point of view on both sides of the plastic mouth is not very smooth, if it is, then it is the welding marks. From the reasons for the formation of weld lines, in order to reduce the weld lines, it is necessary to reduce injection or extrusion process material "after shunt convergence" phenomenon possibilities. In order to reduce and eliminate this phenomenon, the following methods:

1 Increase the mold temperature

2 Adjusting the injection speed

3 Full Exhaust

4 Keep the mold surface clean

5 Adjust the injection pressure and fill plastic pressure

The Guide for applying for China National Standards of Mould Industry

National Standardization Management Committee issued “2014 National Standards Establishmen Guide” on April 2014, proposed the key support direction, major domain and related requirements of China National Standards projects.

Plastic mould is the basis of manufacturing industry and the high-end manufacturing technique equipment. The basic manufacturing method, basic components and parts, high performance of machinery equipment ,and eco-friendly manufacturing development standard is the critical area for 2014 national standard establishment. The relative companies can use this chance to submit their standard in mold industry. There are two periods for submitting: April 1st ~ May 15th; July 1st ~ August 15th , the standard committee will sincerely offer organization and services work for submitting standards and project implement.

China Metal Tooling Exports May Exceed Japan

A few days ago, a Japanese media claim that, in the past Japan mold industry takes the leadership of the world, but now China has become a mold exporting superpower, threating the position of Japan mold industry. The statistics shows that the mould export of China is approaching Japan’s. Although the “Pure export” --the quantity which export minus import, Japan is twice of China, but there is some opinion says that China become the largest injection mold maker exporting country is only a matter of time.

The secret of China approaching Japan so quickly is the different manufacturing method. China implement line production via huge-crowd strategy, to make the mass production possible for mold making. In big scale mold factories of China, mold building are distinguished into different processes: design, machining, assembly, trial, correction etc. Japan’s molds are majorly built by small or medium scale factories. Among 8000 Japan mold factories, the small and micro factories with less than 10 staff. For 70% more. Japanese all-round mold makers constantly sharpen their skills, making the mould one by one, the work needs to be done by 10 persons in China can be done by only one in Japan.

The advantage of huge-crowd strategy is the workers can start work in a short time, but it also has lots of disadvantage such as a high employee turnover rate. The comment from the mould industry for the mold built in China is “ The price is 70% of Japan, and the quality is only 70% of Japan”. But China have begun the changes, more and more china injection mold manufacturer come to realize the importance of skillful employee, and there will be more factories introduce Japan manufacturing methods in the future.

Injection mold which elements in the design of an important consideration?

Injection mold manufacturer design has the following five points precautions. Below we explain each: 

Cavity Surface roughness: 

Injection mold cavity surface roughness directly affect gloss products, injection molding mold highly polished surface will be bright surface products, Wu Guang injection mold is prepared dull products. Multi-cavity die too if the surface roughness, the surface of the plastic sheet adheres easily mold cavity, the surface roughness value should be less appropriate injection molds. 

Implied ratio: 

Depth to width ratio than the plastic parts called extension, extension ratio reflects the ease of molding plastic parts, extension ratio increases, forming harder. And extension than the plastic variety, molding methods. 

Injection mold fillet: 

To avoid stress concentration, improve the impact strength, injection mold cavity surface edges and corners should be adopted fillets, corner radii should be equal to or greater than the plate (sheet) material thickness, but not less than 1.5mm. 

Slope: 

To facilitate the release, the slope of the mold is generally 0.5 ° -3 °, while the punch is 2 ° -7 °. 

Suction hole design: 

The most common is through the evacuation orifice. Suction hole size, quantity to meet the needs of molded plastic parts, generally for good fluidity, thin, plastic molding temperature is low, pumping holes should be smaller; plates thicker, pumping holes can be larger. Vacuum holes shall be designed to meet in a very short time the air out of the injection mold cavity, the article surface without leaving any trace request.

Injection mold of 3D surface model is the technical difficulties

Type in the manufacture of injection molds, 3D surface processing has always been a key,is also a difficulty.As early as in the traditional processing, type 3D surface has been made a lot of training to achieve, so that it will be affect the quality of the mould and processing effect.If can type surface 3 d modeling and nc machining

technology, so that can improve the work efficiency and quality of mould.Injection mould type surface 3 d modelling and numerical control processing technology is an indispensable part of modern mold production, is also cad/CAM technology applied in the mold production.

For injection mould type surface modelling and nc machining technology, has important theoretical and realistic significance.Injection mould, such as: small speakers front panel convex-concave shape is complex, modelling is difficult, the traditional processing and even difficult to achieve, even if also can not guarantee the accuracy, can be implemented machining efficiency.