xiuumin's blog


The manufacture of Dustbin Mould(FURNITUREMOULD) refers to the processing of forming and blank making tools, in addition to shearing mould and dustbin mould. Usually, the dustbin mould consists of an upper mould and a lower mould. The steel plate is placed between the upper die and the lower die to form the material under the action of the press. When the press is opened, the workpiece determined by the shape of the dustbin die will be obtained or the corresponding waste material will be removed.

Basic characteristics:

(1) High machining accuracy requirements

A pair of moulds is generally composed of female mould, male mould and mould base, and some may be multi-piece modules. Therefore, the combination of upper and lower dies, the combination of insert and cavity, and the combination of modules all require high machining accuracy. The dimensional accuracy of precision dies often reaches μ m.

(2) Complex shape and surface

Some product-shaped surfaces are formed by combining various curved surfaces, so the cavity surface of the mould is very complicated. Some curved surfaces must be treated by mathematical calculation.

(3) Small batch size

Mould production is not mass production, in many cases, only one pair is produced.

(4) Many working procedures

Milling, boring, drilling, reaming, tapping and other processes are always used in the manufacturing of the die.

(5) Repeated production

The use of the mould has a long life. When the service life of a pair of moulds exceeds its service life, a new mould must be replaced, so the production of moulds is often repetitive.

(6) Profiling

Sometimes there is neither pattern nor data in the mould production, and copying processing must be carried out according to the actual objects. This requires high imitation precision and no deformation.

(7) Excellent mould materials and high hardness

The main materials of the mould are mostly made of high-quality alloy steel, especially high-life moulds, which are often made of Leroi steel such as Crl2 and CrWMn. This kind of steel has strict requirements from blank forging, processing to heat treatment. Therefore, the compilation of processing technology cannot be ignored even more. Heat treatment deformation is also a problem that needs to be taken seriously in processing.

According to the above-mentioned characteristics, the selection of machine tools should meet the processing requirements as much as possible. For example, the numerical control system has stronger functions, higher precision of machine tools, better rigidity, better thermal stability and profiling functions.

If you are interested in our products, you can click Crate Mould to learn more information.

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.

If you are interested in our products, you can click Crate Mould to learn more information.

1. Accept the task

(1) The formal drawing of the crate mould after being audited and signed and the brand and transparency of the plastic shall be indicated.

(2) Specifications or technical requirements for plastic parts.

(3) Production output.

(4) Samples of plastic parts.

Usually, the task of designing the Crate Mould(FURNITUREMOULD) is put forward by the craftsman according to the task book of forming plastic parts, and the mould designer designs the mould according to the task book of forming plastic parts and the task book of mould design.

2. Collect, analyze and digest the original data

Collect and sort out the data on the design, moulding process, moulding equipment, mechanical processing and special processing for use in the design of crate mould.

(1) digest the drawing of plastic parts, understand the purpose of the parts, and analyze the technical requirements such as manufacturability and dimensional accuracy of plastic parts. For example, what are the requirements of plastic parts in terms of appearance shape, color transparency and service performance, whether the geometric structure, inclination and insert of the plastic parts are reasonable, the allowable degree of forming defects such as weld marks and shrinkage cavities, and whether there is post-processing such as coating, electroplating, glueing, drilling, etc. Select the dimension with the highest dimensional accuracy of plastic parts for analysis to see if the estimated forming tolerance is lower than that of plastic parts and whether the plastic parts can be formed to meet the requirements. In addition, it is necessary to know the plasticizing and moulding process parameters of plastics.

(2) Digesting process data, analyzing whether the requirements of moulding method, equipment type, material specification, crate mould structure type and the like proposed in the process specification are appropriate and can be implemented.

The moulding materials shall meet the strength requirements of plastic parts and have good fluidity, uniformity, isotropy and thermal stability. According to the application of plastic parts, the moulding materials shall meet the requirements of dyeing and metal plating conditions, decoration performance, necessary elasticity and plasticity, transparency or opposite reflection performance, adhesiveness or weldability, etc.

(3) Determining a moulding method

Is it direct compression, casting or injection?

(4) Selecting moulding equipment

According to the type of moulding equipment to choose the crate mould, so we must be familiar with the performance, specifications and characteristics of various moulding equipment. For example, for injection machines, the following contents should be understood in terms of specifications: injection capacity, mould clamping pressure, injection pressure, mould installation size, ejection device and size, nozzle hole diameter and nozzle spherical radius, gate sleeve positioning ring size, mould maximum thickness and minimum thickness, mould stroke, etc. See relevant parameters for details. The overall dimensions of the mould should be preliminarily estimated to determine whether the mould can be installed and used on the selected injection machine.

(5) Specific structural scheme

The choice of an ideal crate mould structure lies in determining the necessary forming equipment and the ideal number of cavities, which can make the crate mould itself meet the requirements of technological technology and economic production of the plastic parts under absolutely reliable conditions. The technological requirements for plastic parts are to ensure the geometric shape, surface finish and dimensional accuracy of plastic parts. The economic requirements of production are to make the cost of plastic parts low, the production efficiency high, the crate mould can work continuously, the service life is long, and the labour force is saved.

If you are interested in our products, you can click Household Product Mould to learn more information.

Under the condition that the structure, materials and use conditions of Daily Necessities Mould(FURNITUREMOULD) are unchanged, ensuring the heat treatment quality and adopting the best heat treatment process are the keys to give full play to the potential of mould materials and improve the service life of daily necessities mould. If the heat treatment process is unreasonable or improper operation causes heat treatment defects, it will seriously damage the service performance of the mould and lead to its early failure.

Pre-heat treatment of daily necessities mould working parts blank includes several processes such as annealing, normalizing, quenching and tempering according to different materials and requirements. Correct pre-heat treatment specifications play a great role in improving the structure, eliminating the structural defects of forged blanks, improving the machinability, and improving the bearing capacity and service life of daily necessities mould.

Quenching and tempering of mould materials for daily necessities is the central link to ensure the performance of mould working parts. Whether the quenching and tempering processes are reasonable or not has a direct impact on the bearing capacity and service life of the mould. The heat treatment process specifications should be strictly controlled or advanced heat treatment methods should be adopted.

The purpose of surface strengthening of the working parts of the daily necessities mould is to obtain the effect of external hardness and internal toughness, and to obtain a good combination of hardness, wear resistance, toughness and fatigue strength, thus improving the service life of the daily necessities mould.

If you are interested in our products, you can click Dustbin Mould to learn more information.

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.

If you are interested in our products, you can click Table Mould to learn more information.

In the process of plastic melting and plasticizing, the Crate Mould(FURNITUREMOULD) is prone to defects. The solution is to reduce the quenching stress after heat treatment to a minimum, because the quenching stress and the mesh carbonized structure, under the action of grinding force, can easily crack the workpiece due to phase transformation of the structure. Reasonable use of cooling and lubricating fluid, play the three major roles of cooling, washing and lubrication, keep the cooling and lubricating clean, thus control the grinding heat within the allowable range, and prevent the thermal deformation of the workpiece.

Specific Operation of Processing Defects of Crate Mould:

1. Improve the cooling conditions during grinding, such as adopting oil impregnated grinding wheel or internal cooling grinding wheel and other measures. When cutting fluid is introduced into the center of grinding wheel, cutting fluid can directly enter grinding area to play an effective cooling role and prevent workpiece surface burns. Reasonable use of cooling and lubricating fluid, play the three major roles of cooling, washing and lubrication, keep the cooling and lubricating clean, thus control the grinding heat within the allowable range, and prevent the thermal deformation of the workpiece.

2. Reduce the quenching stress after heat treatment to the minimum, because under the action of grinding force, the quenching stress and reticular carbonized structure can easily cause cracks in the workpiece due to phase transformation of the structure. In order to eliminate the grinding residual stress of high precision dies, low temperature aging treatment should be carried out after grinding to improve toughness.

3. To eliminate grinding stress, the crate mould can also be immersed in salt bath at 260 ~ 315℃ for 1.5min, and then cooled in oil at 30℃, thus the hardness can be reduced by 1HRC and the residual stress can be reduced by 40% ~ 65%.

4. For precision grinding of precision dies with dimensional tolerance within 0.01mm, attention should be paid to the influence of ambient temperature and constant temperature grinding is required. From the calculation, it can be seen that when the temperature difference of 300mm long steel parts is 3℃, the material has a change of about 10.8μm (10.8=1.2×3×3, the deformation amount per 100mm is 1.2μm/℃). All finishing processes should fully consider the influence of this factor.

5. Electrolytic grinding is adopted to improve the manufacturing precision and surface quality of the crate mould. During electrolytic grinding, the grinding wheel scrapes off oxide film instead of metal, so the grinding force is small, the grinding heat is also small, no grinding burr, crack, burn and other phenomena will occur, and the general surface roughness can be better than Ra0.16μm; In addition, the abrasion of the grinding wheel is reduced. For example, when grinding hard alloy, the abrasion of the silicon carbide grinding wheel is about 400% ~ 600% of the weight of the hard alloy, while when electrolytic grinding is used, the abrasion of the grinding wheel is only 50% ~ 100% of the abrasion of the hard alloy.

If you are interested in our products, you can click Household Product Mould to learn more information.

If the design of the Daily Necessities Mould(FURNITUREMOULD) has not been fully reviewed collectively, the mould structure is unreasonable, which makes the mould undergo many improvements after the mould test, thus making the cost of the daily necessities mould exceed the budget.

If it can be fixed after several improvements, it is lucky. There are many cases that are not satisfactory. Even if the daily necessities mould has to be scrapped and re-made, the cost cannot be controlled. There are also cases where the design of the daily necessities mould is very good, but the processing of the daily necessities mould is not in place, which increases the number of mould tests for no reason and directly increases the mould cost. There is no objection to this problem, so many mould manufacturers have increased their investment in measuring equipment.

What will be the consequences of more tests for daily necessities mould?

1. The best moulding process and the model of the injection moulding machine were not selected during the mould test. Obviously, the mould was well done, but the injection moulded products were not ideal. For no reason, the number of mould tests is increased, which directly increases the mould cost. This is a common problem in some small mould factories.

2. The physical properties of plastics are not fully understood, and even the shrinkage rate is not accurate. This happens from time to time. Therefore, the physical properties of plastic must be made clear before designing moulds for daily necessities so as to effectively reduce the number of mould tests.

If you are interested in our products, you can click Dustbin Mould to learn more information.

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.

If you are interested in our products, you can click Air Cooler Mould to learn more information.

The selection of Chair Mould(FURNITUREMOULD) materials is also important because it not only affects the service life of the chair mould but also directly affects the manufacturing cost of the chair mould. Therefore, some principles should be followed in selecting chair mould materials. Let's take a look below.

(1) According to the type of chair mould processing and its working conditions, the selected materials shall meet the use requirements and shall have higher strength, hardness, wear resistance, impact resistance, fatigue resistance, etc.

(2) selecting materials according to stamping materials and batch production of stamping parts; Meet the processing requirements, should have good processing performance, easy cutting processing, good hardenability, heat treatment deformation is small;

(3) To meet the requirements of the economy, various chair mould parts can be roughly divided into working surface parts, plate parts, shaft parts, sleeve parts, etc. in the processing and manufacturing of chair mould according to the similarity of parts structure and processing process. The processing methods mainly include mechanical processing and special processing. The mechanical processing methods mainly include the cutting processing of various metal cutting machines. Using common and numerical control cutting machines to carry out turning, milling, planing, boring, drilling and grinding processing can complete the processing of most die parts, and then matching with fitter operation can realize the processing and manufacturing of the whole set of dies.

(4) With the continuous improvement of the quality requirements of the chair mould processing, the mould materials with special properties such as high strength, high hardness, and high toughness are appearing continuously and the number of complex profiles and holes is increasing. The traditional mechanical processing methods have been unable to meet the requirements of mould processing. Therefore, the process methods of directly using electric energy, heat energy, light energy, chemical energy, electrochemical energy, acoustic energy, and other special processing have been developed rapidly. At present, the special processing methods mainly based on electrical processing have been widely used in modern mould manufacturing, which is an important supplement to the mechanical processing methods.

If you are interested in our products, you can click Furniture Mould to learn more information.

Generally speaking, the forming surface of Household Product Mould(FURNITUREMOULD) is complex in shape, high in dimensional accuracy and small in surface roughness value, and there are many heat treatment requirements. The consistency and coordination of the forming surface of various related parts have strict requirements. The processing of forming surface is one of the keys and difficult points in the die process of household product mould.

Next, let's look at the main points of household product mould. The processing of various mould parts starts with the processing of the external surface and lays the foundation for the subsequent processing of the forming surface and the structural surface. In the blank design and processing of household product mould, the machining allowance on the outer surface should be made appropriate to avoid material waste and reduce subsequent machining workload. For forgings and casting blanks, necessary annealing and aging heat treatment should be carried out in the blank processing stage to reduce the internal stress of the material and prepare the metallographic structure for subsequent processing.

Die-cutting is to form customized parts with different sizes by precision machining and cutting according to predetermined shapes. The circular knife die-cutting system for die-cutting has a high precision circular knife die-cutting system. Die-cutting and slitting can be completed at one time.

What effect does the refinement of household product mould have on production and processing? It can make the compounding and high efficiency of processing equipment more attractive. High-speed milling has many advantages such as being able to process high-hardness materials, stable processing, small cutting force, small temperature rise and deformation of workpieces, etc., which make mould enterprises pay more and more attention to high-speed processing. Modern measurement technology is continuously integrated into product research and development. Under the system of reverse engineering design and manufacturing, the inseparable relationship between mould and mould parts design and manufacturing is more obvious.

If you are interested in our products, you can click Daily Necessities Mould to learn more information.

Pages: 1 2 3 4 5 ... Next »