Causes of product cracking during injection molding on injection molding machines
The reasons for product cracking during injection molding are as follows: Processing aspect (1) If the processing pressure is too large, the speed is too fast, the more filling, the injection and the holding time are too long, the internal stress will be too large and crack. (2) Adjusting the mold opening speed and pressure to prevent demoulding cracking caused by rapid drawing of the workpiece. (3) Appropriately increase the mold temperature, make the parts easy to demould, and appropriately...
Possible reasons for problems arising in the work of injection molding machines
1. The hydraulic oil in the fuel tank is insufficient. The suction of the oil pump or the dirt of the oil filter will cause the oil pump to be short of oil, causing the air bubbles in the oil to leak and hit the blade to generate noise. The solution is to check the oil quantity and prevent the air from being inhaled. Clean the oil filter. 2. The viscosity of the hydraulic oil is high, and the flow resistance is increased. It is necessary to replace the suitable hydraulic oil. 3. Due to the...
Injection molding machines are prone to some faults in the work - hydraulic system
Oil temperature is too high Oil temperature abnormal rise may be caused by abnormal cooling system or high pressure of hydraulic components when working. 1. The cooling system is not normal. 1) The cooling system is insufficiently supplied. If the water raft is not fully opened, the water pressure is insufficient or the pump flow does not meet the requirements. 2) Blockage of pipes, such as filters, cooling towers or water pipes. 3) The cooling water temperature is too high, such as the cooling...
Preventive maintenance and repair work for injection molding machines mechanical part
1, template parallelism template parallelism zui can reflect the condition of the clamping part, the template is not parallel will make the product unqualified and increase the wear of equipment and mold. The parallelism of the template can be initially reflected by the movement of the tail plate during the clamping and the appearance analysis of the product, but the exact situation needs to be detected by instruments such as a dial gauge. The adjustment of the parallelism of the template must...
Preventive maintenance and repair work on injection mouding machines - electrical components
1. Wire joints Checking the wires of the joints that are not fastened may cause high temperature or sparking damage to the joints. The joints may also affect the transmission of signals; the joints on the contactors may be vibrated by electromagnetic action. It is easier to loosen, so it is necessary to check the position of the wire connector and tighten it regularly. 2. Motors Generally, motors are air-cooled. Dust accumulation makes it difficult to dissipate heat. Therefore, it is regularly...
Preventive maintenance work on injection molding machines - hydraulic oil
First, preventive maintenance work (a), hydraulic part 1. The lack of hydraulic oil quantity will lead to oil temperature easy to rise, the air is easy to dissolve into the oil and affect the normal operation of the oil quality and hydraulic system, the oil is usually insufficient For oil or repair loss, for this reason, you should pay attention to check the leaked parts, replace the worn seals early, tighten the loose joints, etc. After maintenance, check the oil volume of the fuel tank and...
The importance of preventive maintenance and repair work on injection molding machines
Injection molding machine is one of the commonly used equipments in the plastics processing industry. Usually it takes a long time to work. Therefore, how to ensure the normal operation of the injection machine in continuous production is a concern for both the manufacturer and the user of the injection machine. In order to solve the problem, from the user's point of view, under the premise of correct selection of the injection machine type, regular preventive maintenance is an effective way to...
Injection molding machine-Analysis of Injection Molding Process for Two-color Plastic Products
Injection molding two-color or mixed-color plastic products are prepared by mixing the same raw materials into two different colors, and plasticizing two kinds of color melts by two injection molding machines of the same structure and the same specifications, and then injecting them through a nozzle. Inside the mold. The molded plastic products are color-separated, mixed or irregular, and the appearance effect is not obtained by ordinary injection molding and surface modification. The...
Major breakthrough in gas-assisted injection molding technology
Professor Liu Hesheng of Nanchang University undertook the second batch of cross-century academic technology leaders training program for key disciplines in Jiangxi Province—the gas-assisted injection molding technology research and gas-assisted injection molding machine development project, which was recently hosted by Jiangxi Institute of Science and Technology. Accepted by Nanchang Science and Technology Ministry. The successful development of this project has laid a solid theoretical and...
Application of CAE Technology in Injection Mould Design
The process of mold design is generally like this: from the user to the plastic product drawing (which may be two-dimensional or three-dimensional), the mold design engineer considers the appropriate structure according to the type, characteristics and shape of the product. That is, the plastic Pieces can be formed by using what kind of mold structure. In this process, the structural design engineer also needs to select the type, size, gate type, quantity, size, location of the runner and...
The role of software related to plastic tensile machine
This software is an auxiliary software in the plastic tensile machine, which converts the test results of the plastic tensile machine into various data we want. The main features are as follows: 1. Dual report editing: Users can edit reports completely openly. Testers can choose the report format according to their preferences. (A new test program has been added, which expands the previous format of a single professional report, and has built-in EXCEL report editing function) 2. Dynamic...
Pulse pressure injection molding equipment passed the certification
The project of "Pulsatile Pressure Induced Injection Molding Equipment for Plastic Products" jointly developed and produced by Guangzhou Bochuang Machinery Co., Ltd. and the National Engineering Research Center of New Polymer Molding Equipment of South China University of Technology has recently passed the provincial appraisal. This project is one of the scientific and technological achievements of Bochuang and Huagong in the 2003 Guangdong Provincial Major Equipment Technology Innovation...
Senlan launches special frequency converter for new injection molding machine
In the increasingly competitive injection molding industry, how to reduce production costs has become the primary issue of enterprise development. In the actual production cost, the energy consumption of the injection molding machine accounts for a considerable proportion, and the inverter with a significant energy saving effect - the energy saving effect has become synonymous with the energy saving device of the injection molding machine. As a leading brand in the frequency converter industry,...
Injection molding process analysis: knowledge of microthermoforming process
The manufacture of micro-components has always been an application of injection molding technology, however, a "magic" thermoforming process produces high-quality micro-components. At the 16th SPE Thermoforming Technology Annual Conference, the micro thermoforming process was discussed and the potential application potential of the process in the MEMS market was proposed. Technologies discussed at the same time include: "chrome-like" TPO parts, "four-movement pistons" for shorter molding cycle...
Features of insert injection molding technology
Insert molding refers to a molding method in which a resin is injected into a mold and a resin is injected into a mold, and the molten material is bonded to the insert to form an integrated product. Out-sert molding refers to a method of inserting an injection molded part on a part of a metal plate surface. Insert molding refers to a molding method in which resin is injected into a mold, and then the resin is injected into the mold, and the molten material is combined with the insert to form an...
The quality of injection molded products
The quality of injection molded products involves product design, plastic materials, mold design and processing quality, selection of injection molding machines and process adjustment. For normal production molds, it is necessary to ensure and improve the quality of the product, only the adjustment of the injection process; that is, the temperature, pressure flow rate, time and position adjustment. Process adjustments must be fully integrated. If the size of the product changes greatly, it can...
The influence of position control on product quality during injection molding
Position control: Some injection molding machines have mold shift position, die position, stock storage and injection position control. The position of the mold is from the mold opening to the closed mold to lock the entire moving distance called the mold shift position. The best position for mold shifting is to remove the product smoothly. The mold opening distance is too large and the molding cycle is long. The position of the die can be easily removed by simply controlling the position of...
The effect of time settings on product quality in injection molding
Time setting: There are drying time, injection and holding time, cooling time, etc. in the injection molding process. Drying time: It is the drying time of plastic raw materials, and all kinds of plastics have the best drying temperature and time. The drying temperature of ABS plastic is 80-90 ° C for 2 hours. ABS plastic is generally 24 hours, the water absorption is 0.2 to 0.4%, and the water content that can be injection molded is 0.1 to 0.2%. Injection and pressure holding time: The control...
The effect of flow rate on product quality in the injection molding process
Flow rate: related to the speed of the injection molding machine, such as screw speed, injection speed, mold and neutron speed. Screw speed: In addition to adjusting the pre-plastic flow rate, it is mainly affected by the pre-plastic back pressure. If the pre-plastic flow rate is adjusted to a large value, the pre-plastic back pressure is high. As the screw rotates, the plastic has a large shear force in the barrel, and the plastic molecular structure is easily cut. The product has black spots...
The influence of pressure on product quality during the molding process in the injection molding process
Molding process pressure: Pre-plastic back pressure: injection pressure, mold clamping pressure, pressure holding, mold and neutron pressure, shooting table pressure, etc. Pre-plastic back pressure: high back pressure and high storage density, and a large amount of storage in an equal storage volume. Low back pressure, low storage density and low storage. After setting the storage position, and then making a large adjustment of the back pressure, you must pay attention to reset the storage...
The effect of temperature on product quality during injection molding
Molding temperature: barrel temperature, plasticizing temperature, nozzle temperature, mold temperature and plastic drying temperature. Barrel temperature: It is the melting temperature of the plastic. The temperature of the barrel is set too high. The viscosity of the plastic is low after melting. Under the same injection pressure and flow rate, the injection speed is fast, the molded product is easy to fly, silver wire, discoloration and brittleness. The temperature of the cylinder is too...
There are two kinds of quality of the products
There are two kinds of quality of the products, namely: the quality of the inner material and the quality of the appearance. The quality of the inner material is mainly the mechanical strength, and the magnitude of the internal stress directly affects the mechanical strength of the product. The main reason for the internal stress is the crystallinity of the product and the plastic molding. The orientation of the molecules is determined. The appearance quality of the product is the surface...
In the whole injection molding process, gas grain defects are a common defect in the processing of plastic parts
Four common causes of gas embossing defects in injection molding products In the whole injection molding process, gas grain defects are a common defect in the processing of plastic parts. What causes such defects are generally caused? 1. Injection molding equipment does not match the injection molding products. The selection of injection molding equipment should be reasonable. If the sum of the weight of the product and the gate aggregate is less than 20% of the maximum injection amount, the...
Points to note in heat resistant ABS injection moulding
This article will discuss the processing points of heat-resistant ABS resin molding from five aspects: mold design, material drying, molding temperature, holding pressure and time, and mold temperature. 1. Product mold design The product wall thickness requirements are uniform, and the wall thickness difference of ABS products should be controlled within 25% to prevent local stress concentration caused by excessive wall thickness difference. The root of the column with weaker strength needs to...
