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The main nozzle of the manifold is leaking; the sealing surface is not in place, causing leakage; the template is deformed, causing leakage; the manifold is deformed, resulting in unstable temperature of the leaking.Analysis of common problems in hot runners on plastic molds.Analysis of the cause of leakage: the manifold plate is higher than the manifold plate; several hot nozzles are not in the same plane; the center gasket, the center positioning pin, and the stop pin height are wrong; the hot runner manifold is blocked. Analysis: The quality of the thermostat is too poor;

The connection is loose; the hot runner and the mold are in too much contact, the heat loss is serious; the thermocouple is crushed by the actual temperature and the temperature displayed by the thermostat has an error: the thermocouple and the hot runner have different thermocouple index numbers, ie “J” “K” does not match; the thermostat is adjusted to Fahrenheit; the two sets of thermocouples are cross-interchangeed, resulting in temperature measurement failure; the thermocouple wire is crushed; the thermostat has other faulty valve needle movements.

Reason analysis: insufficient air pressure, poor airway and poor sealing; cylinder system is bitten: cylinder, manifold and nozzle are not concentric, code template heat is too much; needle and guide of needle valve hot nozzle Set precision mold manufacturing of cards dead: different hearts or overheating There is a leakage between the valve needle and the guide sleeve, the cold material encloses the valve needle; the sealant is not in place, if the other is normal, consider the valve needle return groove; check whether the injection signal connection is correct; the gate is opposite the gate wall Thick is too big

Factors such as slow vacuum heating and small temperature difference between the inside and outside of the part determine the deformation of the parts caused by the vacuum heat treatment process. It has a direct impact on the following properties of the mold: 1, the manufacturing precision of the mold: uneven transformation of the structure, incompleteness and excessive residual stress caused by heat treatment, resulting in deformation of the mold after heat treatment, assembly and mold use, Thereby reducing the accuracy of the mold, and even scrapped. 3, the working life of the mold: the unreasonable structure caused by heat treatment, excessive grain size, etc. It is important. What kinds of heat treatment technologies are there now? First, the surface treatment technology of the mold: In addition to the reasonable cooperation of the mold with sufficient strength and toughness, the surface performance of the mold is on the working performance and service life of the mold.

The main application of mold vacuum heat treatment is vacuum oil quenching, vacuum gas quenching and vacuum tempering.. 4, the manufacturing cost of the mold: as the intermediate process or the final process of the mold manufacturing process, the cracking, deformation and poor performance caused by the heat treatment, in most cases will make the mold scrapped, even if it can be used through repair, it will Increase working hours, extend delivery time, and increase mold manufacturing costs., leading to major properties such as mold toughness, hot and cold fatigue performance, anti-wear performance, etc., affecting the working life of the mold. It is the heat treatment technology that has a very close relationship with the quality of the mold, which makes these two technologies promote each other and improve together in the process of modernization. The mold quenching process mainly uses oil cooling and air cooling. Its characteristics are urgently needed in mold manufacturing, such as preventing heating oxidation and non-decarburization.Development trend of mold heat treatment

　　Mold heat treatment is an important process to ensure mold performance. 2, the strength of the mold: improper heat treatment process, heat treatment operation is not standardized or the state of heat treatment equipment is not intact, resulting in the strength high speed injection molding (hardness) of the treated mold can not meet the design requirements. For the working face of the mold which is no longer machined after heat treatment, vacuum tempering is used as much as possible after quenching, especially vacuum hardened workpiece (mold), which can improve the mechanical properties related to surface quality, such as fatigue performance, surface brightness, Corrosion resistance, etc. The surface treatment technology of the mold is to systematically change the morphology, chemical composition, microstructure and stress state of the mold surface by surface coating, surface modification or composite treatment technology to obtain the desired surface properties. With the improvement of the performance of machine tools and cutting tools, the development of pre-hardening technology for mold materials has accelerated. Second, the pre-hardening technology of the mold material: Since the 1970s, the idea of ​​pre-hardening has been proposed internationally, but due to the rigidity of the machine tool and the constraints of the cutting tool, the hardness of the pre-hardening cannot reach the hardness of the mold, so The research and development of hardening technology is not much invested. Vacuum degassing or degassing to eliminate hydrogen embrittlement, thereby improving the plasticity, toughness and fatigue strength of materials (parts).

In order to maintain the excellent characteristics of vacuum heating of workpieces (such as molds), it is very important to select and formulate coolants and cooling processes. Third, the vacuum heat treatment technology of the mold: Vacuum heat treatment technology is a new type of heat treatment technology developed in recent years. At present, most of the applications in mold manufacturing are nitriding, carburizing and hardening film deposition. Because the nitriding technology can form a surface with excellent performance, and the nitriding process has good coordination with the quenching process of the die steel, and the nitriding temperature is low, there is no need for intense cooling after nitriding, and the deformation of the mold is extremely small, so the mold is Surface strengthening is the earliest and most widely used nitriding technique. By the 1980s, the proportion of pre-hardened modules used in plastic molds in industrialized countries in the world has reached 30%

In fact, this is normal. The company has an excellent technical talent team and advanced scientific and technical equipment. The birth of each product has given our team the strength and innovative spirit, with a rigorous attitude and focus on excellence to design the most perfect products for customers. The temperature generally needs to reach above 300 °C. There are some products in the plastic mold manufacturing that are relatively thin in glue, poorly flowable materials or large injection molded parts, such as mobile phone battery cover, nylon fiber plastic material, automobile bumper and door panel, TV rear case, air conditioner housing, etc. The company has more than 20 senior engineers. If there is a certain batch of injection molding production, we have to estimate the measurement, the use of hot runners is quite economical.

The traditional nozzle injection method produces a large number of nozzles, and some nozzles cannot be recycled, so a large amount of raw materials are wasted. So, we should consider the application of hot runners. In the injection molding process, the hot runner plays a very important role in conjunction with the mold. There is also a multi-cavity plastic mold injection molding, which cannot be formed at all. About: The precautions for the use of hot runners in plastic molds are as follows: Moulds are closely related to our lives. Due to the special shape of the plastic mold, it is impossible to insulate with the traditional heat insulating material, so that the heat loss at the high temperature of the mold is extremely great, the heat energy loss is serious, and the thermal fatigue loss of the mold metal at a high temperature is large. The middle product is always heavier than the surrounding ones. The injection molding workshops are manufactured by world-class companies such as Hong Kong Dahua, Toshiba and HVSKY of Canada. It also helps to reduce the wear of the mold and extend the life of the mold. It can make very difficult injection molding relatively simple.The use of hot runners in Shenzhen plastic molds

　　Hengxingchang has an existing plant area of ​​more than 10,000 square meters and has a variety of imported equipment, including one high-speed copying machine imported from the UK, three high-precision CNC machining centers, and five imported CNC machining centers. The large loss of heat in the plastic mold not only directly increases the production cost, but also causes a large economic loss due to the frequent shutdown of a large number of production lines due to frequent mold changes. At the same time, there are precision measuring instruments such as projectors and coordinate measuring instruments to meet the requirements of mold precision. The trust of new and old customers.

Due to the shearing force of the plastic in the flow channel, no matter how reasonable the geometric balance of the mold, the weight of the formed product is difficult to be consistent. Over the years, the company has won Plastic Injection Molded Automotive Parts the technology, equipment, service and delivery on time. Reprinted please specify: Hengxing Chang Mould http://. The hot runner can turn the solidified nozzle into a molten nozzle in the production of plastic molds. In our plastic mold molding, we often see multi-cavity products with different weights. The hot runner is the best technique to ensure the balance of the runner. More than 90% of the items in life must be processed through molds, and 80% of them must be molded by plastic molds. 25 sets of various types of injection molding machines. 10 sets, 4 high-power EDM precision mirror spark machines, 8 wire cutting machines, 25 trampolines, and other supporting molding equipment