外文原文：
Gating system design forms and gate
A. mainstream design 1. Mainstream Road Size
Road end and mainstream is in contact with the nozzle injection machine, and the other end of shunt connected with the taper section of the mobile channel. Road mainstream Xiaoduan size of 3.5 ~ 4 mm. 2. Hub in the form of mainstream Road
Road entrance to the mainstream Xiaoduan and repeated contact with the nozzle injection machine, is a consumable, more stringent requirements of the material, thus, part of the mainstream mold often designed as a removable sleeve, the replacement of the mainstream form (commonly known as the gate sets, said here Jack Tsui), in order to effectively separate the selection of high-quality steel processing and heat treatment. Jack Tsui are standard parts, just to buy on the line. Common jack Tsui into a jack Aguilar asked not care jack Tsui and two under the former map, a jack Aguilar asked for compatibility positioning circle. Jack Tsui specifications are Φ12, Φ16, Φ20, such as several. As for the injection nozzles a radius of 20, so jack Tsui for R21. 3. Mainstream, the fixed hub
Because the use of a child care jack Tsui, using circle with a fixed location in the mold of the panel. Setting circles are also standard parts, the diameter of Φ120 mm, diameter Φ35 mm. Specific institutional form as shown below: B. shunt design
In multi-cavity or multi-cavity gate (plastic pieces of large size) should be set up triage Road, shunt is the mainstream, with the gate between the end of this section of the plastic melt flow channel. It is pouring in molten state system of plastic into the cavity from the mainstream Road, through the cross-sectional area and the changes in the flow of transformation for the smooth transition of the flow pattern. Therefore, should be designed to divert the pressure to meet a good transfer and maintain the ideal state of filling and in the process of movement of pressure loss as possible, can melt plastic balanced distribution to the various cavity. 1. Main shunt the shape and size
Road map is the main streaming (6) in the intake level of under-flow.
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In order to facilitate the processing and condensate expected Stripping, shunt installed in most of sub-surface, the shunt is generally circular cross section trapezoidal shape of U-shaped semi-circular and rectangular, engineering design often used trapezoidal cross-section processing technology is good, and the plastic melting The loss of heat flow resistance are not large, generally using the following formula to determine their experience section size:
Type B-ladder in the bottom edge of the width (mm) m-weight plastic parts (g) L-segregation, the length (mm) H-ladder height (mm)
The bevel side of a ladder often take 50-150, in the application of (-1) should pay attention to its scope of application, that is, plastic parts in the thickness of 3.2 mm below the weight of less than 200 g, and the results in the range 3.2-9.5 mm The only reasonable.
The electrical insulation for the volume of plastic-3221.7324 mm3, the quality of about 4 g, the length of segregation, is expected to design a 140 mm long, and there are four cavity, so:
From B to 8 mm
From H to 5 mm
Small trapezoidal bottom width from 6 mm, and its side perpendicular to the surface at the direction of about 100 percent. In addition the use of the outlet plate (that is, we are talking about the templates and the middle of the plate with a plate between), the shunt must be made trapezoidal cross-section, for diversion, and mainstream Liu Ning Road Stripping.
Actual real-time processing, commonly used cross-section the size of two trapezoidal channel, a large model, a small model. As shown below: 2. Length of the main shunt
Shunt to as short as possible, and less bending, injection molding process for the most economic use of raw materials and the injection of energy consumption, reduce the pressure loss and heat loss. Road will be diverted straight into the design, the chief of 140 mm.
3. The design of shunt
Road diversion of the main streaming of the two territories, following the flow shape
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Deputy shunt in the vertical direction of the flow on the taper of the taper for
unilateralism, 20, the very bottom diameter of φ6 mm, the level of the direction of flow from top to bottom two floors of the diameter of φ4 mm, these values are based on experience, the total length of 38.15mm. 4. Shunt the surface roughness
As shunt in contact with the outer layer of plastic mold rapid cooling, only the center of the plastic melt flow better, because of segregation, the inner surface roughness Ra does not require very low, generally from about 1.6 μ m can, This is not just the surface smooth and help melt the plastic outer cortex fixed cooling, and the center of the melt between the poor have a certain speed, to ensure that the melt flow is appropriate when the shear rate and shear heat .
Actual processing, milling machines used to flow Milling Road, less for the province to die, saved processing texture on the trip. (Province Die: manufacturing mold a very important process, generally equipped with a professional women die province, with grinding machine, sand paper, Whetstone, such as grinding tools will mold cavity surface polished, Moliang, lower cavity surface roughness Degrees.) 5. Shunt layout form
Shunt at the surface of the arrangement and the foregoing cavity are closely related to a variety of different forms of layout, but should follow two principles: that is, on the one hand with tight, narrow plate-size mold the other processes The shortest possible, the clamping force to balance.
The flow of the mold form a balanced layout C. Gate Design
Gate, also known as the feed mouth, is connected with the cavity of the Road diversion channel, in addition to direct gate, it was pouring system in the cross-section of the smallest part, but it is a key part of gating system, gate location, shape and size Plastic pieces of performance and quality of great. 1. Selection of gate
Gate can be divided into restrictive and non-restrictive gate two. We will adopt restrictive gate. On the one hand through the gate of restrictive cross-sectional area of the sudden change to shunt the transmission to produce plastic melt flow rate of acceleration, improve the shear rate, making it ideal state of the movement, full of rapid-balanced cavity, another Improve plastics melt into the cavity when the flow characteristics, adjusting gate size, will enable multi-cavity at the same time is full, can control the
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机械工程及自动化专业外文翻译--浇注系统形式和浇口的设计
