A better tooling maker in China

 1. Injection mold custom processing workpiece to plane positioning According to the number of degrees of freedom restricted by the plane, it can be divided into three types: The main support surface restricts the positioning plane of the three degrees of freedom of the workpiece, and is often used for the positioning surface of the workpiece with relatively high precision. The guide support surface is a positioning plane that limits the two degrees of freedom of the workpiece, and is often made into a narrow and long surface. The thrust support surface is a plane that limits one degree of freedom. In order to ensure accurate positioning, the area of the plane is often made as small as possible. 2. Injection mold custom processing workpiece is positioned with a round hole Long pins limit 4 degrees of freedom; short pins limit 2 degrees of freedom. 3. Injection mold custom processing workpiece outside cylindrical surface positioning The positioning datum is the centerline of the out...

 The design of the ejection mechanism of the injection mold. The ejection mechanism of the injection molded part is a very important mechanism in the injection mold. The structural form of the ejection mechanism of the injection molded part needs to be determined according to the shape, size, wall thickness, precision and six elements of the injection molded part. . Since the ejection mechanism of injection molded parts is installed on one side of the movable template of the injection machine, under the premise that the cavity of the fixed mold has been opened and the core pulling of the injection molded parts has been completed, its function is to eject the molded chilled hard injection molded parts out of the mold cavity or core. Due to the thermal expansion and contraction of the injection molded parts, the cold and hard injection molded parts will be tightly wrapped on the cores of the movable and fixed molds. Generally, it is required to keep the injection molded parts in the ...

 1. Screw speed The screw speed in injection molding conditions refers to the speed of the screw used to mix the pellets. The unit is rpm (rev/minute). If the screw speed is too fast, air may be mixed into the molten resin and gas may be easily generated. If the screw speed is too slow, there may be insufficient mixing and deviations in material quality may occur. 2. Screw back pressure Screw back pressure refers to the pressure when the screw is retracted during material metering. The unit is MPa or kgf/cm2. The mixing state of the material will change due to the change of back pressure. 3. Mold opening and closing speed Mold opening and closing speed refers to the mold opening speed and mold closing speed of the mold, the unit is mm/s. Shorter mold opening and closing times are effective in shortening cycle time, but if the mold closing speed is too fast, the risk of violent collision of the mold will increase, so the brake must be applied just before the mold closing is complete...

 1. Design reference for inclined top lateral core-pulling mechanism of injection mold: 1. Conventional form of lateral core mechanism: slider + inclined guide column, slider + hydraulic cylinder, inclined top block, inclined push block, inclined slider + spring, etc. 2. The length of the guide section of the ram is at least 2/3 of the length of the ram. 3. The ejection angle of the inclined roof should be designed within 6~12゜ as far as possible, and the minimum angle should not be less than 3゜. 4. When the product structure can only reach 20° when the product structure is limited, it is necessary to use a double-link inclined roof mechanism. 5. If the inclined ejector pin is purchased, the minimum Ф16MM is used, and the conventional use is Ф20MM. For large injection molds, the inclined ejector pin is preferably used Ф25MM. 6. It is necessary to design the auxiliary reference plane for the inclined jack head with the aid of the ejector rod. 7. The inclined jacking block and the in...

 1. Cooling time The cooling time in injection molding conditions refers to the time required for the molded product to solidify in the mold. Switch to cooling time after holding pressure. The unit is s (second). If the cooling time is too short, the amount of shrinkage will be large, the size of the product will be reduced, and deformation may occur during ejection. On the other hand, if the cooling time is too long, the molding cycle will become longer and the productivity will decrease, that is, the processing cost of the molded product will increase. Cooling time is the most influential factor in the molding cycle, so how to shorten the cooling time is the key to shortening the molding cycle. 2. Measurement position The metering position is the position where the screw or plunger measures the volume of resin required for injection molding. The unit is mm. If the metering position is too short, poor filling will occur. If the metering position is too long, excess resin may remai...

 The column in this issue is the check list in the design of injection molding mold, runner/gate. Injection molding molds must have runners and gates, which are used as channels for injecting the plastic used as the molding material into the mold after melting. The following are design inspection items related to runners and gates. (1) Is it necessary to do runner equalization? (2) Does the diameter of the tip of the gate match the diameter of the injection nozzle of the molding machine? (3) Does the thickness of the nozzle meet the flow requirements? (4) Is the cross-sectional shape of the runner appropriate? (5) What is the cross-sectional area of the flow channel? (6) What is the average hydraulic radius of the runner? (7) What is the weight of the runner? (8) Do you need runner material? (9) Is the relationship between the position of the runner material and the gate appropriate? (10) Can the runner be demolded smoothly? (11) Can the runner be pushed out smoothly? (12) What is ...

 1. Filling pressure In injection molding conditions, filling pressure refers to the pressure to fill the resin into the mold, also known as primary pressure. The unit is MPa or kgf/cm2. That is the unit of pressure. There are also some injection molding machines that set the maximum injection pressure to 100%, and then adjust the injection molding conditions by changing the percentage. (Example: 35%) If the filling pressure is too low, poor filling (underfill) will occur. If the filling pressure is too high, the parting surface may be momentarily opened by the pressure, and burrs may appear around the molded product. Sometimes poor release occurs. 2. Injection speed Injection speed refers to the speed at which molten plastic fills the mold. The unit is mm/s. When considering injection volume per unit of time, it may be stated as "injection rate", in which case the unit is cm3/s. If the injection speed is too slow, filling defects may occur; if the injection speed is too fast...

 1. Molding conditions of injection molding machine In order to operate the injection molding machine for actual injection molding processing, it is necessary to use molding materials and molds, and complete the processing of the molded product in a state that matches the specifications of the molded product. Simply injecting molten plastic into the mold and taking it out after solidification will cause severe dimensional deviation, glossy appearance or uneven transfer of the molded product, and it is impossible to obtain a molded product with uniform quality. In order to obtain the desired quality of injection molded products, it is necessary to adjust various parameters called "molding conditions" on the injection molding machine, and adjust the conditions while controlling the size and appearance quality to meet the specification requirements. In other words, whether the molding conditions are adjusted well or not will affect the quality of the injection molding products p...

 As you know, injection molding mold is the mother tool used to produce injection molded products. I believe you can also understand that molds have a great influence on the quality, cost and production capacity of injection molded products. The molded product production system consists of the following subsystems. Molded product production system—— Injection molding machine mold Mold temperature adjustment device Molded product take-out device Molding material supply device Molded product inspection device Secondary treatment device Air conditioning management unit (clean room) In order to realize the overall optimization of the molded product production system, the following management objectives (goals) need to be clarified through numerical data. 1. Quality indicators of molded products (important control dimensions and control tolerances, surface roughness, burr control indicators, light transmittance, etc.) 2. Molding cycle (the shorter the better) 3. Price of molded products...

 The number of cavities that can be processed by one injection in a plastic molding mold is called the number of cavities. In the actual application records, the number of cavities is at least 1 and at most 192. The higher the number of cavities, the higher the number of molded products per injection, thus reducing the production cost per part. However, as the number of cavities increases, there is a tendency that there will be great differences in the quality of molded products such as size, weight, and appearance of each cavity. The number of cavities must be determined after comprehensive consideration of advantages and disadvantages. In general, the number of cavities tends to be as follows depending on the type of mold. ¡ Large molded products...basically a single cavity reason The mold is large, so it is physically difficult to set more than 2 cavities.   ¡ Small and medium-sized molding products such as automobiles and home appliances... about 4 to 8 cavities reason Con...

 It is more effective to use a 2-tier structure for the check list of mold drawings. First, write a checklist that is checked separately by the designer and by a third party. The purpose of this checklist is to identify, from a third-party neutral perspective, whether there are serious misunderstandings about important items. Second, write a "self-checklist" based on the designer's own detailed thinking path. The purpose of this checklist is to find human error in detailed design matters. The following is an example of a "check list" that was checked by the designer himself and by a third party. (1) Is the front and back of the cavity-core correct? (2) Is the number of cavities consistent? (3) Does the parting surface meet the specification requirements? (4) Does the gate position meet the specification requirements? (5) Is the cost structure of the formed product satisfactory? (6) In terms of production performance, does it have a satisfactory production capaci...

 Plastic gears are precision mechanical components used for the transmission and control of rotating shafts. If the gear performance is poor, problems such as poor rotation, noise, and vibration will occur. Since it is a plastic molding product, shrinkage or deformation may naturally occur, but in order to minimize various defect factors, the mold structure must also be considered during design. The key points of the design are introduced below. Point 1: Cavity-Core Positioning The positioning of the cavity-core should allow cylindrical tapered inserts respectively, so that the centers of the cavity-core are aligned as precisely as possible. Point 2: Gate location Be careful to make sure that the gate is a point gate and that it is located close to the center. Point 3: Number of gates Improve coaxiality by configuring odd-numbered gates such as 3, 5, and 7. Point 4: Eject method When using ejector pins to eject, the ejector pins must be evenly arranged at a distance that can be eje...

 During the molding process, injection molding molds must be maintained at a resin-specific mold temperature. For this reason, it is necessary to accurately grasp the mold temperature range of the resin used and incorporate it into the mold design so that the mold has the function of maintaining the optimum temperature range. The following are design inspection items required for mold temperature control. (1) The name of the resin used (2) The manufacturer of the resin used (3) The grade of resin used (4) Characteristics of the resin used (5) Additives for resins used (6) Recommended mold temperature range for the resin used (7) Design scheduled molding cycle (8) Types of heat sources for temperature control (water, oil, pressurized steam, electricity) (9) Heat capacity of active side (10) Fixed side heat capacity (11) Total heat capacity (12) Reynolds number when water cooling (13) Predetermined temperature distribution of molded products (14) Spacing between water holes (15) Inte...

 Checklist in Mold Design for Injection Molding, Ejection. Usually, an ejector structure is required to remove the part from the cavity. The following are design inspection items related to ejection of molded products. (1) Does the formed product stay on the side envisioned in the design (usually the active side)? (2) How many mm is the ejection stroke? (3) Does the ejection stroke exceed the necessary ejection amount of the molded product? (4) Is the ejection stroke larger than necessary? (5) Is there a control mechanism for the ejection stroke? (block, etc.) (6) In order to eject the boss, is it necessary to use a straight push tube? (7) Are the ejector pins for ejecting the stiffener sufficient? (8) Is the setting of the pneumatic ejector appropriate? (9) Is the gas path of the pneumatic ejector appropriate? (10) Has the compressed air supplied to the pneumatic ejector been dehumidified? (11) Is it necessary to adopt a two-stage ejection structure? (12) Is the two-stage ejection...

 The inclined roof is one of the components of our automotive mold design. Before the automotive mold design, a series of structural analysis will be carried out on the product structure provided by the customer on the 3D drawings. Then, according to the structural requirements of the product, for the processing A body designed by some barbs away. The mechanism that also deals with barbs also has row positions, so what is the difference between the inclined roof and the row positions in the automobile mold? Today, the editor will take you to know one or two: The existence conditions of the row position and the inclined roof in the automobile mold are to change the vertical movement direction to the horizontal movement direction when the mold is opened. But the biggest difference between the two lies in the fact that the objects of the driving force are different: the movement of the row is based on the movement of the front and rear molds, and the movement of the inclined top is ba...

 Polishing is a very important process in the mold making process, and it is also the final work. With the increasing use of plastic products, the requirements for the appearance quality of plastic products are getting higher and higher. Therefore, the surface polishing of plastic mold cavities The quality should also be improved accordingly, especially the molds with mirror surface and high-gloss high-gloss surface have higher requirements for the surface roughness of the mold, so the requirements for polishing are also higher. Polishing not only increases the beauty of the workpiece, but also improves the corrosion resistance and wear resistance of the material surface, and can also facilitate subsequent injection molding processing, such as making plastic products easy to demould and reducing production injection molding cycles. At present, the commonly used polishing methods are as follows: (1) Mechanical polishing   Mechanical polishing is a polishing method that remo...

Car lights are mainly used for lighting, which can be said to be the eyes of the car. Car lights are a general term for all car lighting systems. Automobile lights have high requirements on the appearance, and several important parts are transparent parts, electroplated parts, etc. It can be said that the parts with the highest requirements on the appearance of automobiles are the lights, so the requirements for mold design and manufacturing are extremely high. Glue feeding method: do mold flow analysis, confirm the number and location of glue feeding points and weld marks to the customer. Before opening the mold, the position of the clamping line needs to be confirmed by the customer. Mold steel material: NAK80 or S136H is used for transparent products, the original material certificate must be provided, and the hardness of the front and rear molds is staggered. The front mold of reflective products adopts NAK80 or S136H (HRC32-36), and the original material certificate must be provid...

 Mold flow analysis The operation process and precautions for two-color mold analysis only need 10 steps 1. Hard glue for mesh analysis: Note: Do double-sided grid analysis first, remember the size of the double-sided grid, create a flow channel and then divide it with a double-sided grid, check that there is no problem before performing the overall 3D grid analysis 2. Soft glue for mesh analysis: The steps are the same as for soft glue: Note: The grid size should be consistent with the hard glue, and the aspect ratio of the product should also be consistent with the hard glue. Two-color product analysis can only be performed on 3D grids 3. Merge the two divided drawings of hard glue and soft glue, and design the product and flow channel for 1-shot and 2-shot respectively.Note: After the soft glue is loaded into the hard glue image file, it does not matter if the runners overlap, and it will not affect the analysis. You need to set the runner properties to 1 shot and 2 shots respec...

 Plastic mold structure 1. Questions to consider when designing injection molds: 1. Understand the flow behavior of the plastic melt, consider the flow resistance and flow velocity of the plastic in the runner and the cavity, and check the maximum flow length. According to the flow direction of the plastic in the mold (ie, the filling sequence), consider the flow of the plastic in the mold The problem of internal re-fusion and the original air export of the mold cavity. 2. Consider plastic shrinkage and feeding during cooling. 3. Control the crystallization and orientation of plastic in the mold through mold design and improve the internal stress of the product. 4. The selection of the parting surface of the pouring point 5. The problem of horizontal parting core pulling and ejection of the workpiece. 6. Mold cooling or heating problems. 7. The relationship between the size of the mold and the injection machine used, including the relationship with the maximum injection volume of t...

 What kind of steel is used for the mold of automobile lamps? Use 2738H 2343 SP350 718H These materials are special materials for car lights If the cost of the mold is not high, then use the domestic 2738H material, and use the imported 2343 material for the middle core. If the cost is acceptable, use the 718H NAK80 material. In addition, 8407 DAC SKD61, these materials belong to metal die-casting molds. These materials are rust-proof and polished, which is okay, but they are almost useless in the car lights. Be careful. The car lights require no sand holes and no orange peel patterns on the light board, so P20 The ____ does not work

 Basic principles of two-color mold design: (1) Do 1 time for hard glue and 2 times for soft glue; (2) Do one time for transparency, and two times for non-transparency; (3) Plastic with high molding temperature should be done once, and plastic with low molding temperature should be done twice; The above is the basic principle of making two-color molds, otherwise the mold will be in vain; in addition, try to use sealant sealant instead of inserting sealant sealant when sealing, even if it is recommended that customers modify the product, they must use sealant sealant as much as possible; 2. The guide post and guide sleeve of the mold base must be symmetrical up and down, left and right, and the front and rear molds must be symmetrical. 3. The rear mold should be rotated 180 degrees, and the front mold should not move. 4. The product spacing must be based on the nozzle spacing of the injection molding machine. The nozzle spacing of some two-color injection molding machines abroad is ...

 injection molding machine The method of connecting cooling water: 1. The injection molding machine has two water cooling channels, one is mold cooling and the other is oil cooling. 2. The water inlet pipe is divided into two ways with a tee, and a valve is added to the oil cooler to adjust the water inlet. 3. Backwater It can be separated or brought together, and the pipe should be as large as possible to facilitate drainage. Extended information: injection molding machine aka injection molding machine or injection machine , it will be thermoplastic or thermosetting plastic The main molding equipment that uses plastic molding molds to make plastic products of various shapes. Divided into vertical, horizontal, and all-electric types, the injection molding machine can heat the plastic and apply high pressure to the molten plastic to make it inject and fill the mold cavity. Working principle of injection molding machine: The working principle of the injection molding machine is simil...