Industry Information_News_Shanghai Siage Industrial Limited Company

12-22 

What is the difference between precision molds and ordinary molds?

What are the differences between precision molds and ordinary molds? Now we first understand the six characteristics of precision mold forming: 1. The dimensional accuracy of the product is high, and the tolerance is small, that is, there is a high-precision dimensional boundary; Second, the repeatability of the product is required to be high, and the dimensional stability of the day, month, and year is required; 3. The material of the mold is good, the rigidity is sufficient, the dimensional accuracy of the cavity, the smoothness and the positioning accuracy between the templates are high; Fourth, use precision injection molding machines to replace conventional injection molding machines; 5. Adopt precision molding technology; 6. Choose materials suitable for precision molding. Secondly, the drawings must be comprehensive, complete and accurate, use inserts as much as possible, consider processing, and rely on the machine to ensure the dimensions as much as possible. Strict design tolerances, not only the working part of the cavity and core, but also the relevant dimensions of the installation position of all inserts must be strictly limited. Generally controlled at +/-0.005

11-24 

How to make silicone mold?

1. Silicone mold is one of the simplest methods in rapid molds. Generally, the prototype is re-molded with silica gel. Generally, about 10-30 pieces can be copied! Silicone molds have good flexibility and replication performance, so you don’t need to consider pulling out. The inclination of the mold will not affect the dimensional accuracy, and it has good partitionability. It can be directly poured as a whole without dividing the upper and lower molds. Then cut along the predetermined parting line to take out the master mold! 2. Regarding the production of silicone molds, the selection of the mold opening form and the selection of the mold line are very important. First, it is convenient to take the mold. Second, the mold line should be selected so as not to affect the overall effect of the product. Third, it does not affect the quality of the product. For example, the mold line position of the waterscape series products is too high, and the mold sealing line requires a lot of materials, and the product cracks are prone to occur; the fourth is to reduce the process operation procedures, such as opening half of the mold. 3. In order to prevent silica gel from flowing around, fix the mold with wooden squares or boards in a regular range. When opening the die, use the wooden board and the sludge to separate the first part. There is no gap between the sludge and the mold, and the surface of the sludge is smooth. smooth. After the above work is prepared, then apply petroleum jelly or spray release agent on the plaster mold or the mold. For smooth products, use a clean cotton cloth dipped in petroleum jelly and apply it evenly on the mold. Keep for 30 minutes to make the mold. The product fully absorbs the petroleum jelly, and then wipes the surface of the mold with a clean cotton cloth, and the surface is required to be bright; and the textured product only needs to be evenly coated with the petroleum jelly to adjust the silica gel according to the formula. When mixing the silica gel, stir in irregular directions to make the curing agent and silica gel fully mix to minimize air mixing into the rubber. For smooth products, it is best to vacuum once when the first layer of rubber is applied, and keep the vacuum at -0.1Mpa. 7-8 seconds. 4. Molding should be made in time after the silica gel is matched. Pour the glue on the highest part of the mold in a trickle, let it flow naturally, brush it in place with an oil paintbrush where the flow is not in place, if it is a piece of silica gel, not only fill the entire product, but also brush the glue evenly. Each product should be brushed with at least three layers of silica gel. The thickness of each layer of silica gel is 1mm. In the process of brushing the silica gel, each layer is required to be cured before the other layer can be brushed. When brushing the third layer, add one layer on top of the second layer. Layer gauze to increase the strength of silicone. The thickness of the entire mold silicone part is controlled at 3-4mm according to the different requirements of the product size, and the width is not greater than the product width 60 mm. The start time of silica gel is 20 minutes. 5. Wash the master mold and dry it for smooth treatment (a layer of mold release wax or mold release agent can be applied) 6. Put 500-1000 grams of mold silicone rubber (mold silicone, mold rubber, silicone rubber, silicone) as a plastic basin for use; 7. Weigh the hardener according to the weight ratio (usually 1.5-2.5%), add it to the container for mixing, and stir well; 8. Add a certain amount of silica gel diluent as appropriate (especially the first layer). Until the mixture is uniform, usually 3-5 minutes. 9. Mold silicone rubber (mold silicone rubber, mold rubber, silicone rubber, silica gel) is mixed with the hardener, and reacts at room temperature and releases low-molecular alcohol. In order to release the alcohol molecule from the colloid, it needs to be bubbled under negative pressure. -3 minutes. It can also be used without equipment (mainly depends on the operating experience of the mold maker) 10. Multi-layer coating film molds should be cured at the same time as inside, middle and outside. When the amount of curing agent is relatively small, the reaction time is longer and the reaction is sufficient, and the colloid is good. Therefore, the amount of curing agent is best to be less inside and more outside. When brushing, wait for the first layer (inner layer) to dry before brushing the second layer. The operating time is 30-50 minutes, and the mold removal time is 10-15 hours. The curing time is 24 hours. Note that it is best to add a mold cloth after painting the first and second layers, which can greatly improve the service life of the mold (but not use glass fiber cloth, otherwise it is easy to cause delamination and the entire mold is scrapped) 11. Three-dimensional perfusion mold, generally curing in 10-15 hours is better. 12. After the soft mold is made, plaste

11-24 

The development status of the mold industry?

The overall output value and market scale of the mold industry maintained growth. Mold manufacturing refers to the manufacturing of molds for metal casting, molds for mineral materials, molds for rubber or plastics, and molds for other purposes. The mold industry is commonly known as the "mother of industry". From focusing on single workshop production to nowadays with many brands, the quality and quantity of molds in my country have made a very big leap. In recent years, with the rapid development of my country’s national economy and the increase in people’s income, the consumer market’s demand for consumer goods such as automobiles, communications, electronics, and home appliances has increased rapidly, making these industries enter a stage of rapid development, which has also become the rapid development of my country’s mold industry. An important driving force for development. According to statistics, the total output value of my country's mold industry from 2010 to 2019 is on the rise. In 2019, the total output value of my country's mold industry is about 290 billion yuan, an increase of 4.92% year-on-year. It is expected that by 2020, the total output value of my country's mold industry can reach 3043 100 million yuan.

11-24 

Material performance of die steel 8566?

8566 die steel is a die steel with high hardness, high wear resistance and toughness. The materials are imported from Germany, and the ingredients are kept secret. There is no corresponding brand in China for the time being. The use hardness of 8566 is between HRC55-60, and high hardness represents high strength and high wear resistance. 8566 has a very good balance of wear resistance and toughness. It has both a certain degree of wear resistance and toughness, which can ensure that the life of the die exceeds the conventional one, and at the same time ensure that the punch material does not crack. . 8566 has a very good balance of wear resistance and toughness. It has both a certain degree of wear resistance and toughness, which can ensure that the life of the die exceeds the conventional one, and at the same time ensure that the punch material does not crack.

11-24 

What kinds of mold coatings are there?

CVD (Chemical Vapor Deposition) and PVD (Physical Vapor Deposition) technologies are both widely used in mold surface treatment. Among them, CVD coating technology has more excellent resistance to high temperature oxidation and strong coating bonding force. , The application effect on the extrusion die is good. TD coating treatment is a surface super-hardening treatment technology, which is the abbreviation of Thermal Diffision Carbide Coating Process (Thermal Diffision Carbide Coating Process), and the English abbreviation "TD Coating". Mold surface treatment-laser surface Technology Highlights (1) The hardness of the laser quenched layer reaches HV800～1100, and it has excellent wear resistance and tensile resistance. The service life after one-time mold repair is 5-50 times longer than that of flame quenching. (2) The laser quenching layer has uniform hardness and layer depth, and has a strong bonding force with the substrate. (3) The amount of deformation after laser quenching is extremely small, and there is no need for any correction and processing. (4) Laser fusion welding technology can repair damaged parts such as local strain on the surface of the mold, and the repair effect is significantly better than other welding methods. (5) It has a high processing speed, usually up to 0.5m2/h. (6) It is only necessary to carry out targeted treatment on the worn parts of the mold, and it is not necessary to treat all the surface of the mold. (7) Significantly improve the surface quality of the drawn parts. Pulsed High Energy Electron Beam Technology Mold surface treatment-pulse 1. Technical Principles and Features The use of pulsed high-energy beams can achieve a variety of surface treatment processes. The essence is to produce an extreme processing condition far from equilibrium on the surface of the material through the action of instantaneous high energy density, so that the material in the energy-affected zone undergoes mass distribution, chemical and The mechanical state changes, and finally the surface structure and performance that are difficult to reach by conventional methods are obtained. At present, pulsed high-energy beams mainly include laser beams, ion beams, electron beams and plasma beams. Among them, the use of electron beams for surface treatment has the following advantages: using accelerated electrons as the energy carrier, the energy conversion efficiency when interacting with the material surface is 70% to 80% higher than that of laser treatment, and there is no element injection problem. The treatment in vacuum can be Avoid oxidation and pollution problems.

11-24 

What are the precautions for the development of the sheet metal processing industry?

In today's economic situation, the development of many industries is struggling. There are naturally many obstacles to the development of the sheet metal processing industry. If you want to break through the shackles of the current economic situation, you must grasp every step of your own development. Strive to achieve the sustainable development of the industry. For the sheet metal processing industry, if they want to occupy their own market in the existing market environment, they must know which aspects they should change to achieve breakthroughs in their own industry. During the development of the sheet metal processing industry, the improvement of processing technology must always be the first priority. Always grasp the development trend of the market, cultivate professional core talents, continuously improve the processing and manufacturing technology, and strive to move the direction of sheet metal processing toward a relatively large-scale development such as the automobile manufacturing industry and the large-scale shipbuilding industry. Continuously expand the market share of sheet metal processing products, so that more fields can understand the performance advantages of sheet metal processing products. In addition, it is necessary to improve the packaging of products, and strive to develop in the direction of advanced and high-end products, so that market demand can be continuously improved. For the sheet metal processing industry, in the current stage of development, the key is to strive to build your own brand and try to avoid relying on other brand labels. We must strive to achieve the development of our own brand, let more people realize the superiority of our own country's sheet metal processing products, and rely on the strength of our own brand to reduce the market share of foreign products in our country. In addition, the sheet metal processing industry still has to humbly learn from others, actively learn from others' strengths, improve self-innovation capabilities and promote self-development. In addition, the service attitude should also be constantly changed, so that customers are truly satisfied, good after-sales service and providing customers with satisfactory services are very beneficial to the development of the industry.

11-23 

What kinds of molds are divided into and which molds are more difficult to make?

Molds can be divided into different types according to different classification standards. The difficult molds are injection molds and stamping molds. There are three types of classification methods that are currently familiar: 1. Molds can be divided into metal molds and non-metal molds according to whether they are made of metal. Metal molds are further divided into: casting molds and forging molds, etc.; non-metallic molds are further divided into: plastic molds and inorganic non-metallic molds. 2. According to the different materials of the mold itself, the mold can be divided into: plastic mold, sand mold, metal mold, vacuum mold, paraffin mold and so on. Among them, with the rapid development of polymer plastics, plastic molds are closely related to people's lives. Plastic molds can generally be divided into: injection molding molds, extrusion molding molds, gas-assisted molding molds, and so on. 3. According to different materials, there are plastic molds, metal stamping molds, forging molds, metal die-casting molds, ceramic molds, glass molds, glass steel molds, etc.

11-23 

Selection of Surface Machining Methods for Inner Hole of CNC Lathe Machined Parts？

There are many methods for surface processing of inner holes of CNC lathes. Commonly used are drilling, reaming, reaming, boring, turning, grinding, drawing, grinding, honing, and rolling holes. Applicable method for inner hole machining of CNC lathe machined parts: Reaming: Reaming is to use a reaming drill to further process the drilled hole to enlarge the aperture and improve the accuracy (precision) and reduce the surface roughness value. The dimensional tolerance level that can be achieved by reaming is IT11~IT10, and the surface roughness value is Ra12.5~6.3μm. It belongs to the semi-finishing method of hole processing. It is often used as pre-processing before reaming, and can also be used as precision (precision) The final machining of holes that are not high. 1. Drilling: Drilling holes in the physical part of the workpiece with a drill is called drilling. CNC machining is a process method for parts processing on CNC machine tools. The process regulations of CNC machine tool processing and traditional machine tool processing are generally consistent, but significant changes have also taken place. A machining method that uses digital information to control the displacement of parts and tools. It is an effective way to solve the problems of variable parts, small batches, complex shapes, and high precision, and to achieve high-efficiency and automated processing. The drilling is rough machining, and the dimensional tolerance level that can be reached is IT13~IT11, and the surface roughness value is Ra50~12.5μm. Is it due to the long length of the twist drill, the small core diameter and poor rigidity, as well as the influence of the chisel edge. 2. Reaming: Reaming is a finishing method for holes on the basis of semi-finishing (reaming or semi-finishing boring). In CNC machining, the control system issues instructions to make the tool perform various motions that meet the requirements. The shape and size of the workpiece are expressed in numbers and letters in the form of technical requirements and processing requirements. It generally refers to the process of processing parts on CNC machine tools. In order to improve the degree of production automation, shorten the programming time and reduce the cost of CNC machining, a series of advanced CNC machining technologies have been developed and used in the aerospace industry. The size tolerance of the reaming hole can reach IT9~IT6, and the surface roughness value can be Ra3.2~0.2μm. There are two ways of reaming: organic hinge and hand hinge. Reaming on a machine tool is called a machine hinge, and a manual reaming is called a hand hinge. 3. Turning hole: Turning hole on the lathe is the rotation of the workpiece and the movement of the turning tool. The aperture size can be controlled by the cutting depth of the turning tool and the number of passes, which makes the operation more convenient. In CNC machining, the control system issues instructions to make the tool perform various motions that meet the requirements. The shape and size of the workpiece are expressed in numbers and letters in the form of technical requirements and processing requirements. It generally refers to the process of processing parts on CNC machine tools. In order to improve the degree of production automation, shorten the programming time and reduce the cost of CNC machining, a series of advanced CNC machining technologies have been developed and used in the aerospace industry. Lathe turning holes are mostly used to process the holes of disc sleeves and small brackets. 4. Boring: Boring is the further processing of holes that have been drilled, cast or forged with a boring tool. It can be performed on a lathe, boring machine or milling machine. Boring is one of the commonly used hole processing methods, which can be divided into rough boring, semi-fine boring and fine boring. The dimensional tolerance grade of rough boring is IT13~IT12, and the surface roughness value is Ra12.5~6.3μm; the dimensional tolerance grade of semi-finish boring is IT10~IT9, and the surface roughness value is Ra6.3~3.2μm; The dimensional tolerance grade is IT8~IT7, and the surface roughness value is Ra1.6~0.8μm.

10-27 

The basic design principle of the mold?

Because different molding molds have been applied in many fields, and the manufacturing technology of professional molds has also undergone certain changes and development in recent years, so in this part, the general design rules of vacuum plastic molding molds are summarized. The design of vacuum blister molding mold includes batch size, molding equipment, precision conditions, geometric shape design, dimensional stability and surface quality. 1. For large and small batch experiments, the mold output is small, and it can be made of wood or resin. However, if the experimental mold is to obtain data on shrinkage, dimensional stability and cycle time of the product, a single-cavity mold should be used for the experiment, and it can be used under production conditions. Molds are generally made of plaster, copper, aluminum, or aluminum-steel alloy, and aluminum-resin is rarely used. 2. Geometric shape design, when designing, it is often necessary to comprehensively consider dimensional stability and surface quality. For example, product design and dimensional stability require the use of a female mold, but products with a higher surface gloss require the use of a male mold. In this way, the plastic part orderer will comprehensively consider these two points so that the product can be in the most Produce under optimal conditions. Experience has proved that designs that do not meet the actual processing conditions often fail. 3. Dimensional stability. During the molding process, the surface of the plastic part in contact with the mold has better dimensional stability than the part leaving the mold. If the material thickness needs to be changed in the future due to the need of material rigidity, it may cause the male mold to be converted to the female mold. The dimensional tolerance of plastic parts cannot be less than 10% of the shrinkage rate. 4. The surface of the plastic part, in terms of the range that the molding material can cover, the surface structure of the visible surface of the plastic part should be formed at the contact point with the mold. If possible, the smooth surface of the plastic part should not be in contact with the mold surface. It's like using female molds to make bathtubs and washtubs. 5. Modification, if you use a mechanical horizontal saw to cut off the clamping edge of the plastic part, there must be at least 6~8mm margin in the height direction. Other dressing work, such as grinding, laser cutting or jet, must also be left margin. The gap between the cutting lines of the knife edge die is the smallest, and the distribution width of the punching die is also small when trimming. These should be noted. 6. Shrinkage and deformation, plastics are easy to shrink (such as PE), some plastic parts are easy to deform, no matter how to prevent them, plastic parts will deform during the cooling stage. Under this condition, it is necessary to change the shape of the forming mold to adapt to the geometric deviation of the plastic part. For example: Although the wall of the plastic part remains straight, its reference center has deviated by 10mm; the mold base can be raised to adjust the shrinkage of this deformation. 7. The amount of shrinkage, the following shrinkage factors must be considered when manufacturing the blister mold. ① The molded product shrinks. If the shrinkage rate of the plastic is not clearly known, it must be obtained by sampling or experimenting with a mold of similar shape. Note: Only the shrinkage rate can be obtained by this method, but the deformed size cannot be obtained. ② Shrinkage caused by the adverse effects of intermediate media, such as ceramics, silicone rubber, etc. ③ The shrinkage of the material used in the mold, such as the shrinkage when casting aluminum.

12-22 

Several factors generally need to be considered in sheet metal processing?

Generally used materials are cold rolled plate (SPCC), hot rolled plate (SHCC), galvanized plate (SECC, SGCC), copper (CU) brass, red copper, beryllium copper, aluminum plate (6061, 5052, 1010, 1060) , 6063, duralumin, etc.), aluminum profiles, stainless steel (mirror, brushed, matte), according to the different functions of the product, the choice of materials is different, generally you need to consider the product's use and cost. 1. Sheet metal processing cold-rolled sheet SPCC, mainly used for electroplating and baking varnished parts, low cost, easy to shape, and material thickness ≤ 3.2mm. 2. Hot-rolled sheet SHCC, material T≥3.0mm, is also used for electroplating and baking varnished parts. The cost is low, but it is difficult to form. Flat parts are mainly used.　 3. Galvanized sheet SECC, SGCC. SECC electrolytic board is divided into N material and P material. N material is mainly not used for appearance treatment, and the cost is high. P material is used for spraying parts. 4. Copper: It is mainly made of conductive materials, and its surface treatment is nickel-plated, chrome-plated, or no treatment, so the cost is high. 5. Aluminum plate; generally use surface chromate (J11-A), oxidation (conductive oxidation, chemical oxidation), high cost, silver plating, nickel plating. 6. Aluminum profiles; materials with complex cross-section structures are often used in various sub-boxes. The exterior treatment is the same as the aluminum plate. 7. Stainless steel; it is mainly used without any appearance treatment, and the cost is high.