Thanks to the friends who read this article, this article is divided into two chapters. If you want to know Chapter 1, please review it in our industry knowledge list.

Fourth, draw the mold map

1. It is required to draw according to the national drawing standard, but it is also required to combine the factory standards and the factory customary methods not specified by the state. Before drawing the master assembly drawing, the process drawing should be drawn and conformed to the requirements of the parts drawing and process data.

Plastic mold structure and plastic mold design process

2, the size guaranteed by the next process, should be marked on the map marked "process size". If, after the molding, no other machining is performed except for the repair of the burrs, the process diagram is exactly the same as the workpiece drawing.

3. It is best to mark the part number, name, material, material shrinkage rate, drawing ratio, etc. under the process diagram. Usually the process picture is on the mold assembly drawing.

4. Draw the final assembly structure diagram: draw the final assembly drawing as much as possible with a ratio of 1:1. Start drawing from the cavity first, and draw the main view at the same time as other views.

Plastic mold structure and plastic mold design process

5. The final assembly drawing of the mold shall include the following contents:

1. The structure of the mold forming part.

2. The structure of the pouring system and the exhaust system.

3. Parting surface and parting mode.

4. Outline structure and position of all connecting parts, positioning and guiding parts.

5. Mark the cavity height dimension (not required, as needed) and the overall size of the mold.

6, auxiliary tools (removing tools, tools, calibration tools, etc.).

7. Program all the part numbers in order and fill in the detailed list.

8. Mark technical requirements and instructions for use.

Sixth, the technical requirements of the mold assembly drawing content:

1. Performance requirements for certain systems of the mold. For example, the assembly requirements for the ejector system and the slider core structure.

2. Requirements for the mold assembly process. For example, the fitting gap of the bonding surface of the parting surface after the mold is assembled should be

Not more than 0, 05mm parallel and below the mold requirements, and pointed out the size determined by the assembly and the requirements for the size.

3, mold use, assembly and disassembly methods.

4, anti-oxidation treatment, mold number, lettering, marking, oil seal, storage and other requirements.

5. Requirements for test and inspection.

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Seven, draw all parts map

The order of drawing the parts drawing from the mold assembly drawing should be: first inside and then outside, first complicated and then simple, first forming parts, then structural parts.

1, graphics requirements: must be drawn in proportion, allowing to zoom in or out. The view selection is reasonable, the projection is correct, and the layout is proper. In order to make the processing patent number easy to understand and easy to assemble, the graphics should be as consistent as possible with the final assembly drawing, and the graphics should be clear.

2. The dimensioning requirements are uniform, centralized, orderly and complete. The order of dimensioning is: first mark the main part size and the draft angle, then mark the fit size, and then mark the whole size. Mark the fit size on the non-main part drawing and mark the full size.

3. Surface roughness. Mark the roughness of the most applied type in the upper right corner of the drawing, as marked "Others 3, 2." Other roughness symbols are marked on each surface of the part.

4, other content, such as part name, mold drawing number, material grade, heat treatment and hardness requirements, surface treatment, graphic proportion, free size processing accuracy, technical description, etc. must be correctly filled out.

Eight, proofreading, reviewing, drawing, sending sun

(1) The content of self-proofing is:

1. The relationship between molds and their parts and plastic parts drawings

Whether the material, hardness, dimensional accuracy, structure, etc. of the mold and mold parts meet the requirements of the plastic parts drawings.

2, plastic parts

Whether the flow, shrinkage, weld mark, crack, and draft angle of the plastic material affect the performance, dimensional accuracy, surface quality and the like of the plastic parts. Whether the pattern design is insufficient or not, whether the processing is simple or not, and whether the shrinkage rate of the molding material is selected correctly.

3. Forming equipment

The injection volume, injection pressure, and clamping force are insufficient. The installation of the mold, the south core of the plastic part, and the mold release have no problem. The nozzle of the injection machine and the mouthpiece are in proper contact.

4, mold structure

(1) Whether the position of the parting surface and the precision of finishing can meet the needs, will there be any flashing, and whether the plastic part can be left on the side of the mold with the ejector device after the mold is opened.

(2) Is the demoulding method correct? Is the size, position and quantity of the promotion rod and the push tube appropriate, and whether the push plate will be caught by the core, and whether the molded part will be scratched.

(3) Mold temperature adjustment. The power and quantity of the heater; whether the flow line position, size and quantity of the cooling medium are suitable.

(4) A method of processing the undercut of the plastic part, whether the mechanism for removing the concave side is appropriate, for example, whether the slider and the push rod in the core pulling mechanism of the inclined guide column interfere with each other.

(5) Whether the position of the pouring and exhausting system is appropriate.

5, design drawings

(1) Whether the placement of each mold part on the assembly drawing is appropriate, whether it is clear or not, whether it is missing;

(2) The part number, name, number of production, part internal or outsourced on the parts drawing, whether it is standard or non-standard parts, the precision of the part processing, the correction processing and the margin of the high-precision size of the molded plastic parts Whether the material of the mold part, heat treatment, surface treatment, surface finishing degree is marked, and the description is clear.

(3) Working parts and matching dimensions of main parts and molded parts of parts. The size figures should be correct and should not be converted by the producer.

(4) Check the view position of all parts drawing and assembly drawing, whether the projection is correct, whether the drawing conforms to the national standard of drawing, and whether there is any missing size.

6, check processing performance

(Whether the geometry of all parts, view drawing, size mark, etc. is beneficial for processing);

7, the main working size of the recovery aid

(2) Professional proofreading is carried out in principle according to the designer's self-calibration project; however, it should focus on structural principles, process performance and operational safety. When drawing, first digest the graphics, draw according to the requirements of the national standard, fill in all the dimensions and technical requirements. Self-schooling and signing after the description.

(3) Submit the prepared base map to the designer for proofreading. The customary practice is to review the relevant technical personnel of the tool manufacturing unit, sign and check the manufacturing process, and then send the sun.

(4) Writing a manufacturing process card

The manufacturing process card is written by the tool manufacturer's technician and is ready for processing. In the manufacturing process of the mold parts, the inspection should be strengthened, and the inspection focus should be on the dimensional accuracy. After the mold assembly is completed, the inspector performs the inspection according to the mold inspection table. The main thing is to check whether the performance of the mold parts is good. Only in this way can the quality of the mold be manufactured.

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Nine, try and repair

1. Although the mold design is carried out under the expected process conditions when selecting molding materials and molding equipment, people's understanding is often imperfect. Therefore, after the mold processing is completed, the mold test must be carried out to see the molding. How is the quality of the parts? It is always found that after the erroneous revision is carried out.

2, plastic parts have many types of bad phenomena, the reasons are also very complicated, there are mold reasons, there are also reasons for the process conditions, the two often only together. Before the mold is repaired, it should be carefully analyzed according to the actual situation of the defective phenomenon of the plastic parts, and the remedy method should be proposed after finding out the cause of the defects of the plastic parts. Since the molding conditions are easily changed, it is common practice to change the molding conditions first, and when the molding conditions cannot be solved, the mold is considered to be repaired.

3, repair molds should be more cautious, not very sure not to act rashly. The reason is that once the mold conditions are changed, it is impossible to make major modifications and restore the original condition.

X. Organize data for archiving

After the mold has been tested, if it is not used for a while, it should be completely wiped off the mold residue, dust, oil, etc., coated with butter or other anti-rust oil or rust inhibitor, and kept in a storage place.

Plastic mold structure and plastic mold design process

The above is the plastic mold structure and plastic mold design process introduced for everyone. Of course, everyone should pay attention to not only look at the price, but also consider all aspects of quality, cycle and service. There are many types of molds, which can be roughly divided into ten categories. According to different requirements of parts materials, physical and chemical properties, mechanical strength, dimensional accuracy, surface finish, service life, economy, etc., different types of mold forming are selected. Molds with high precision requirements need to use high-precision CNC machine tools, and the mold materials and forming processes have strict requirements. CAD/CAE/CAM mold technology is also needed to design and analyze. Some parts have special requirements for molding, and the mold also needs to use advanced processes such as hot runner, gas-assisted molding, and nitrogen cylinder. Manufacturers should have CNC, EDM, wire cutting machine tools and CNC copy milling equipment, high-precision grinding machines, high-precision three-coordinate measuring instruments, computer design and related software. Generally, large-scale stamping dies (such as automotive cover molds) should consider whether the machine has a crimping mechanism, or even a lubricant, multi-station grade. In addition to punching tonnage, it is necessary to consider the punching, feeding device, machine tool and mold protection device.

Thank you for reading this long article, I wish you a happy life.