Traditional injection mold design is mainly two-dimensional and empirical design. It is difficult to express the shape and structure of products correctly and in detail only with two-dimensional engineering drawings, and it can not be directly applied to NC machining. The analysis and calculation period in the design process is long and the accuracy is poor. With the development of CAD/CAE/CAM technology, the modern injection mold design method is that the designer directly establishes the three-dimensional model of the product on the computer, optimizes the mold structure according to the three-dimensional model design of the product, and then carries out numerical control programming according to the three-dimensional model of the mold structure design. This method carries out product model design, mold structure design, machining programming and process design based on three-dimensional data, and realizes data sharing, which can not only improve design efficiency quickly, but also ensure quality and reduce cost. The design of injection mold is an experienced topic. Due to the limited design experience, it is difficult to design directly with the three-dimensional modeling software UG/MoldWizard at one time.

Main functions of 1

Injection mold design 1. Rotary die machining.

The method of rotational molding process is to add plastic into the mold first, and then the mold rotates continuously along two vertical axes and is heated. Under the action of gravity and heat energy, the plastic in the mold is gradually and evenly coated, melted and attached to the whole surface of the mold cavity, molded into the required shape, and cooled and shaped.

Secondly, compared with traditional blow molding and injection molding processes, rotational molding process has the following advantages:

1. cost advantage: in the rotational molding process, only the strength of the frame is needed to support the weight of the material, the mold and the frame itself, thus preventing the clamping force of material leakage; In addition, in the whole molding process, the material is hardly influenced by any external force except the action of natural gravity, so it has the advantages of convenient machining and manufacturing, short cycle and low cost.

2. Quality advantage. In the whole production process, because there is no internal stress, the product quality and structure are more stable.

3. The advantages of flexibility. The machine model of rotational molding process is convenient to manufacture and low in price, which is especially suitable for multi-variety and small batch production in new product development. 4. Advantages of personalized design. The products of rotational molding process are easy to change color and can be hollow (seamless and welded). The surface treatment of products can achieve the effect of patterns, wood, stone and metal, and meet the individual needs of consumers in modern society.

Three. The products produced by the process include: oil tank, water tank, mechanical shell, fender, etc. The main replacement objects are metal parts and FRP products.

Fourthly, injection molding.

Injection molding is a process developed based on micro-manufacturing technology such as LIGA. Of course, there are many other ways. LIGA process is to make the model needed for injection molding, which is commonly known as "mold", then pour the liquid plastic into the mold and finally separate it to form the final product. For example, some plastic toys have too many products.

2 background introduction

Injection Mold Design With the continuous improvement of the international status of China's manufacturing industry, the mold industry has made rapid development, the demand for molds has doubled, and its production cycle has become more and more. Mold production is multi-variety and small batch production, even single-piece production. Its characteristics are: variety diversification; Diversification of production process; The production capacity is complex. To solve this problem, we must first popularize CAD technology and use modern CAD/CAM/CAE technology, which is an economical and fast means for mold development, design and manufacture, and also its future development direction.

CATIA is one of the most influential CAD system software at present, which has been popularized in different fields and favored by many users. CATIA is an integrated CAD/CAE/CAM software of French dassault systemes company, which occupies a leading position in the field of CAD/CAE/CAM in the world. CATIA is widely used in aerospace, automobile manufacturing, shipbuilding, machinery manufacturing, electronics/electrical appliances and consumer goods industries. Its integrated solution covers all product design and manufacturing fields, and its unique DMU electronic prototype module function and hybrid modeling technology promote the competitiveness and productivity of enterprises. CATIA fully applies parametric feature modeling technology, database technology and free-form surface feature technology in the design and analysis stage of plastic mold, which provides a powerful tool for mold design. Standard parts in plastic molds, such as standard mold base, ejection mechanism, gating system, cooling system, etc., are designed by parametric feature modeling design method based on database management or standard parts library is established to realize data sharing. At the same time, users can modify the design at any time, which makes the mold design analysis fast, accurate and efficient. Parametric feature modeling can not only describe the geometric information of the product completely, but also obtain the precision, material and assembly information of the product. The product model established by parametric feature modeling is a model that is easy to handle and can reflect the design intention and processing characteristics. The main function of CATIA mold design module is injection mold design.

3 workflow

Injection mold design ① Establish a three-dimensional model of plastic products;

(2) According to the designed product, drawing analysis and parting surface design are carried out;

(3) Establish the project, load the product and create the calling template;

④ Design guide system, gating system, ejection mechanism, runner and cooling system.

4 module introduction

Injection mold design ① Part design and generative shape design: these two modules are mainly used to complete the establishment of three-dimensional models, in which part design is a part design module and generative shape design is a generative shape design module.

② Core-cavity design: This module is used to construct parting surface, cavity surface and core surface, and define the main mold opening direction and slider direction, that is, the core cavity design module.

③ Mold tooling design: This module is used to call the auxiliary components such as mold base, design guidance system, gating system, ejection mechanism, runner, cooling and so on, that is, the mold design module. CATIA V5 is a PC version of high-end CAD/CAE software developed by IBM/Dassault system. Its core cavity design and mold design module are specially designed for injection mold, which is powerful and easy to use. In a step-by-step way, this book explains various functions from core cavity design, parting surface design, mold base design, parts design, solid modeling of injection mold to conversion from three-dimensional graphics to two-dimensional graphics through detailed examples, which can enable beginners to design injection molds in a short time.