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The working conditions of the Air Cooler Mould(FURNITUREMOULD) are different from those of the cold stamping mould. Generally, the air cooler mould must work at 150 C-200 C. Besides being subjected to certain pressure, it must also be subjected to temperature influence. The basic performance requirements of steel for air cooler mould are summarized as follows according to the use conditions and processing methods of air cooler mould:

1. Sufficient surface hardness and wear resistance

The hardness of the plastic mould is usually below 50-60 HRC. The heat-treated air cooler mould should have sufficient surface hardness to ensure sufficient rigidity of the air cooler mould. During the operation of the mould, due to the filling and flowing of plastic, the mould has to bear large compressive stress and friction force, which requires the mould to maintain the stability of shape accuracy and dimensional accuracy and ensure the mould has sufficient service life. The wear resistance of the mould depends on the chemical composition of the steel and the heat treatment hardness, so improving the hardness of the mould is beneficial to improving its wear resistance.

2. Excellent machinability

In addition to EMD processing, most air cooler mould to need certain cutting processing and fitter repair. In order to prolong the service life of cutting tools, improve cutting performance and reduce surface roughness, the hardness of steel used for air cooler mould must be appropriate.

3. Good polishing performance

For high-quality plastic products, the roughness value of the cavity surface is required to be small. For example, the surface roughness value of the injection mould cavity is required to be less than ra 0.1 ~ 0.25, while the optical surface is required to be ra < 0.01 nm. the mould cavity must be polished to reduce the surface roughness value. The steel materials selected for this purpose require fewer impurities, fine and uniform structure, no fibre directionality, and no pitting or orange peel defects during polishing.

4. Good thermal stability

The shape of air cooler mould parts is often complicated and difficult to process after quenching. It should try to choose the ones with good thermal stability. When the air cooler mould is formed and processed after heat treatment, the linear expansion coefficient is small, the heat treatment deformation is small, the dimensional change rate caused by temperature difference is small, the metallographic structure and the mould size are stable, and the processing can be reduced or stopped, thus ensuring the mould size accuracy and surface roughness requirements.

With the development of the plastic industry, the requirements for the complexity and precision of plastic products are getting higher and higher, and higher requirements are also put forward for mould materials. Pre-hardened steel (such as PMS), corrosion-resistant steel (such as PCR) and low-carbon maraging steel (such as 18Ni-250) can be used for manufacturing complex, precise and corrosion-resistant plastic moulds, all of which have better cutting, heat treatment and polishing properties and higher strength.

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xiu Dec 17 '19 · Tags: air cooler mould, crate mould

Heat treatment of Air Cooler Mould(FURNITUREMOULD) is an important process to ensure mould performance, which has a direct impact on the manufacturing accuracy of air cooler mould, the strength of plastic mould, the working life of mould, and the manufacturing cost of mould.

The heat treatment of air cooler mould is to exert the potential of mould material and improve the service performance of mould. The performance of the air cooler mould must meet the following requirements: high strength (including high-temperature strength, cold and hot fatigue resistance), high hardness (wear resistance) and high toughness, and also require good machinability, (including good polishing) weldability and corrosion resistance, etc.

The deformation of air cooler mould after heat treatment is generally believed to be caused by cooling, which is incorrect. For complex dies, the correctness of the heat treatment process often has a great influence on the deformation of air cooler dies. Comparing with the heating processes of some dies, it can be clearly seen that the heating speed is faster and larger deformation often occurs.

(1) The cause of deformation

Any metal will expand when heated. As steel is heated, uneven temperature (i.e. uneven heating) in each part of the same mould will inevitably lead to an inconsistent expansion in each part of the air cooler mould, thus forming internal stress due to uneven heating. At the temperature below the transformation point of steel, uneven heating mainly produces thermal stress, and uneven heating beyond the transformation temperature will also produce uneven microstructure transformation, which not only produces microstructure stress. Therefore, the faster the heating speed is, the greater the temperature difference between the air cooler die surface and the core, the greater the stress and the greater the deformation of the air cooler die after heat treatment.

(2) Preventive Measures

When heating complex dies below the phase change point, they should be slowly heated. Generally speaking, the vacuum heat treatment deformation of air cooler dies is much smaller than that of salt bath furnace heating quenching. Preheating is adopted, and one-time preheating can be adopted for low alloy steel moulds. For high alloy rigid moulds, secondary preheating shall be adopted.

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xiu Nov 26 '19 · Tags: air cooler mould, table mould

During the use of Table Mould(FURNITUREMOULD), mould wear is a common phenomenon and inevitable. What we can do is to minimize the wear of the table mould and prolong its service life. When we reduce the wear of the table mould, we must first know why the mould wears.

The root cause of table mould wear is the mutual friction between mould parts and parts (or blanks) or between mould parts and parts. Wear leads to mould failure, which is manifested as blunting of blade gate, rounding of edges and corners, plane subsidence, surface groove marks and peeling of the mucosa. In addition, during the work of the punch, the lubricant is converted into high-pressure gas after combustion, which severely scours the surface of the punch and forms cavitation.

During cold punching, if the load is not large, the wear type is mainly oxidation, and the wear can also be occlusal wear to some extent. When the cutting edge becomes blunt or the punching load is large, the occlusal wear will become serious, thus accelerating the wear. In the case of severe carbide segregation or large particle carbides in mould steel, these carbides are easy to flake off, causing abrasive wear and accelerating the wear.

The impact of light cold work mould steel (sheet blanking, stretching, bending, etc.) is not heavy, mainly static wear. Under the condition of static wear, the mould steel contains more carbon and its wear resistance is greater. Under impact wear conditions (such as cold heading, cold extrusion, hot forging, etc.), excessive carbides in mould steel do not help to improve wear resistance but reduce wear resistance due to impact abrasive wear.

The above is an introduction to the causes of mould wear analyzed for everyone. in general, under the condition of impact abrasive wear, the carbon content of mould steel is limited to O.6%%, and the cold heading mould works under the condition of impact load, such as too much carbide in mould steel, which is easy to cause solid impact wear and peel off the surface. These exfoliated hard particles will become abrasive particles, accelerating the wear rate. Therefore, in the mould work, we should reduce the occurrence of this kind of situation.

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xiu Nov 5 '19 · Tags: air cooler mould, table mould

As the most important moulding equipment for the processing of injection moulding products, Furniture Mould(FURNITUREMOULD) are directly related to the quality of the products. Therefore, improving the quality of furniture mould, maintaining and maintaining them, and extending their service life are important topics for the cost-effectiveness of injection moulding products processing enterprises.

1. Pay attention to the surface maintenance of furniture mould, which directly affects the surface quality of the product, the focus is to prevent corrosion. After the furniture mould has completed the production task, the residual injection moulding should be carefully removed. The residual injection moulding and other deposits in the furniture mould can be removed with copper rods, copper wire, and soapy water, and then air-dried. Disable the cleaning of hard objects such as wire and steel bars to avoid scratching the surface.

2. Under the normal operation of the furniture mould, test the various properties of the furniture mould, and measure the size of the final moulded plastic part. Through this information, the existing state of the furniture mould can be determined, and the cavity, core, and cooling system can be found. As well as the damage of the parting surface, etc., according to the information provided by the plastic parts, the damage state of the furniture mould and the maintenance measures can be judged.

3. It is necessary to carry out key tracking and inspection of several important parts of furniture mould. The function of the ejection and guiding parts is to ensure the opening and closing movement of the furniture mould and the ejection of the plastic parts. If any part is stuck due to damage, the production will be stopped, so it is necessary to check whether the ejector rod, the guide column, etc. are deformed and surfaced frequently. Damage once found, should be replaced in time.

4. The cleaning of the cooling channels is important for production efficiency and product quality. As the production time continues, the cooling channel is easy to deposit scale, rust, sludge, and algae, which makes the cooling passage section smaller, the cooling passage narrows, greatly reduces the heat exchange rate between the coolant and the furniture mould, and increases the production cost of the enterprise. Therefore, the cleaning of the flow channel should be taken seriously.

5. For hot runner moulds, maintenance of the heating and control system helps prevent production failures.

A well-maintained and maintained furniture mould can shorten the assembly and test time of furniture moulds, reduce production failures, stabilize production, ensure product quality, reduce waste loss, and reduce operating costs and fixed assets investment. At the beginning of the production cycle, the company can smoothly produce quality products. Therefore, for injection moulding products processing enterprises, in the current fierce market competition, the maintenance of good moulds can help the enterprise.

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In precision injection moulding, the Air Cooler Mould(FURNITUREMOULD) is one of the keys to obtaining precision plastic products that meet the quality requirements. The air cooler mould for precision injection moulding should meet the requirements of product size, precision, and shape. However, even if the accuracy and size of the air cooler mould are the same, the actual size of the moulded plastic product may be inconsistent due to the difference in the amount of shrinkage. Therefore, effective control of the shrinkage of plastic products is very important in precision injection moulding technology.

Whether the air cooler mould is designed properly or not will directly affect the shrinkage of the plastic product. Since the air cooler mould cavity size is determined by the size of the plastic product plus the estimated shrinkage rate, the shrinkage rate is produced by plastic. A range of values recommended by the manufacturer or engineering plastics manual, not only related to the gate form of the air cooler mould, the position and distribution of the gate, but also the crystal orientation (anisotropic) of the engineering plastic, the shape of the plastic product , size, distance to the gate and location. The main factors affecting plastic shrinkage are heat shrinkage, phase change shrinkage, orientation shrinkage, compression shrinkage, and elastic recovery. These factors are related to the moulding conditions or operating conditions of precision injection moulded products. Therefore, the relationship between these influencing factors and injection moulding conditions and their apparent factors must be considered when designing the air cooler mould, such as injection pressure and cavity pressure and filling speed, injection melt temperature and mould temperature, mould structure, and gate. Form and distribution, as well as the cross-sectional area of ??the gate, the thickness of the product, the content of reinforcing filler in the plastic material, the crystallinity and orientation of the plastic material. The influence of the above factors is also different due to different plastic materials, other moulding conditions such as temperature, humidity, continued crystallization, internal stress after moulding, and changes in the injection moulding machine.

Because the injection moulding process is the process of converting plastic from solid (powder or pellet) to liquid (melt) to solid (product). From the pellets to the melt, from the melt to the product, the temperature field, stress field, flow field, and density field are used in the middle. Under the action of these fields, different plastics (thermosetting or thermoplastic, crystallinity) Or non-crystalline, reinforced or non-reinforced, etc.) have different polymer structural morphology and rheological properties. Any factors that affect the above "field" will affect the physical and mechanical properties, size, shape, precision and appearance quality of plastic products.

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The Air Cooler Mould(FURNITUREMOULD) uses a hot runner, and the formed product has no water-free material, which does not require post-processing, which completely automates the entire moulding process, saves working time and improves work efficiency.

The pressure loss is small. The hot runner temperature is equal to the temperature of the injection moulding machine nozzle, avoiding surface condensation of the raw material in the runner, and the injection pressure loss is small. Repeated use of spouts can degrade the performance of plastics, while the use of hot runner systems without spouts can reduce the loss of raw materials and thus reduce production costs. The temperature and pressure in the cavity are uniforms, the stress of the plastic part is small, and the density is uniform. Under a small injection pressure, a shorter moulding time, a better product than the general injection moulding system is injected.

For transparent parts, thin parts, large plastic parts or high-demand plastic parts, it can show its advantages, and it can produce larger products with smaller models. The hot nozzles are standardized, serialized, and equipped with a variety of nozzle tips for interchangeability. The unique design and processing of the electric heating ring can achieve uniform heating temperature and long service life. The hot runner system is equipped with a hot runner plate, a thermostat, etc. The design is exquisite, diverse, easy to use, and stable and reliable. The shortcomings of the application of the runner system: the overall mould closing height is increased, and the overall height of the air cooler mould is increased due to the addition of the hot runner plate. Thermal radiation is difficult to control, and the biggest problem with hot runners is the heat loss of the runner, which is a major issue that needs to be solved. There is thermal expansion, and thermal expansion and contraction are issues that we should consider when designing. Air cooler mould manufacturing costs increase, hot runner system standard accessories are expensive, affecting the popularity of hot runner air cooler mould.

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In our daily work and study, we often see two concepts: plastic injection Furniture Mould(FURNITUREMOULD) and plastic furniture mould. What is the difference between the two? In fact, the injection mould and the plastic mould are moulds, which have the same place and are different. To find out the difference between them, we must first understand what is an injection moulding furniture mould and what is a plastic furniture mould.

The plastic furniture mould is a combined plastic mould for compression moulding, extrusion moulding, injection moulding, blow moulding and low foaming moulding, which is mainly composed of a female die base, a female die assembly and a female die combined clamping plate. The improved cavity is a punch with a variable core and consists of a punch combination substrate, a punch assembly, a punch combination clamping plate, a cavity cutting assembly and a side cutting combination plate. Coordinated changes of convex, concave and auxiliary moulding systems of dies. Can process a series of plastic parts with different shapes and sizes.

Injection mould for furniture is a tool for producing plastic products. It is also a tool that provides the complete structure and precise size of plastic products. Injection moulding is a processing method for the mass production of some complex shapes. Specifically, plastic melted by heat is injected into a mould cavity by an injection moulding machine under high pressure, and after cooling and curing, a moulded product is obtained. The injection mould consists of two parts: a moving mould and a fixed mould. The movable mould is installed on the movable mould of the injection moulding machine, and the fixed mould is installed on the fixed mould of the injection moulding machine. During injection moulding, the movable mould and the fixed mould are closed to form a casting system and a mould cavity. When the mould is opened, the movable mould and the fixed mould are separated to take out the plastic product. In order to reduce the heavy workload of mould design and manufacturing, most injection moulds use standard mould bases.

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In the thin-wall injection moulding of Furniture Mould(FURNITUREMOULD), it is inevitable to encounter the stress problem of injection moulding, because in the process of thin-wall injection moulding, with the changes of process conditions in various stages, various stress polymerization will occur, and stress concentration is the prominent manifestation of product deformation, warping, brittleness, etc.

Different pressure situations need to be solved from corresponding directions:

1. Furniture mould development: The first material needs to select materials with appropriate strength and rigidity, as well as sliders, mandrels, mandrels, etc. according to many factors such as product strength requirements, machine clamping pressure and product production requirements. Reasonable design, uniform surface treatment of furniture mould, reducing uneven resistance of demoulding.

2. Temperature difference: High melting temperature is helpful for the injection process, but the low temperature of furniture mould will cause uneven cooling, so the temperature difference between the two should be allowed to be minimized.

3. Orientation stress: There are many reasons for polymer chain orientation. Therefore, a comprehensive and accurate analysis of the injection moulding process is the basis for solving orientation stress. Generally, the furniture mould temperature for thin-walled products needs to be higher to ensure that the melt does not solidify prematurely before filling the entire cavity. After the gate is solidified, the holding pressure needs to be evacuated, and too long holding time will cause too much pressure on the melt in the cavity. Injection pressure and injection time are also very important.

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1. Purpose: To ensure that the equipment can maintain the best performance state and extend the service life to ensure the normal production.


1. This standard must be implemented by trained injection moulding technicians and mould managers.

2. The injection moulding foreman is responsible for implementation and inspection and supervision, and is in charge of regular supervision.

Maintenance of Furniture Mould(FURNITUREMOULD) before production

1. The surface oil and rust of the furniture mould must be cleaned up. Check the cooling water hole of the furniture mould for foreign matter. Is there any waterway?

2. It is necessary to check whether the arc in the rubber mould cover of the furniture is damaged or not, and whether there is any foreign matter remaining.

3. Whether the screws and the clamping clips of the fixed template of the furniture mould are tightened.

4. After the furniture mould is installed on the injection machine, the empty mould must be operated first. Observe whether the operation of each part is flexible, whether there is abnormal phenomenon, whether the active part such as the guide post, the ejector pin, the row position is worn, whether the lubrication is good, the ejection stroke, the opening stroke is in place, and whether the parting surface is in conformity when the mould is closed Strictly wait.

Quarterly routine inspections:

Mainly for the cleaning and maintenance of furniture mould that have not been used for more than two months.

1. Open the furniture mould and check the internal anti-rust effect. If there is any abnormality, it must be re-rustproofed. Long-term use of furniture mould to be buttering.

2. Put it back in place and make a note.

Storage of furniture mould

A mould library should be set up, special personnel should be set up, and furniture mould files should be established. If possible, computer management should be carried out on the moulds. The mould library should choose a place with low moisture and ventilation. The temperature should be kept below 70%. If the humidity exceeds 70%, the mould will be easy to rust. The furniture mould should be stored on the shelf, pay attention to anti-corrosion and dustproof.

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1. If the cavity is poorly processed, if there are defects such as scratches, micropores, abrasion, roughness, etc., it will inevitably be reflected on the plastic parts, and the gloss of the plastic parts is poor. In this case, the Air Cooler Mould(FURNITUREMOULD) should be carefully machined to make the cavity surface rougher and chrome-polished if necessary.

2. If the surface of the cavity is oily or watery, or if there are too many release agents, the surface of the plastic part will become darker and darker. To do this, remove grease and water stains in a timely manner and use a limited amount of release agent.

3. If the plastic parts are too small, the demoulding is difficult, or the force is too large when demolding, so that the surface gloss of the plastic parts is good. In this case, the draft angle should be increased.

4. If the air cooler mould is depleted, excess air will be left in the air cooler mould, which will also result in reduced gloss. To do this, check and correct the air cooler mould exhaust system.

5. If the cross-sectional area of the gate or runner is too small or abruptly changed, the shear force is too great when the melt flows therein, and the turbulence is dynamic, resulting in poor gloss. To this end, the cross-sectional area of ??the gate and runner should be properly enlarged.

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