First, draw a mold diagram
It is required to be drawn in accordance with national drafting standards, but it is also required to combine the factory's standards with the customary drawing methods not specified by the country. Before drawing the mold assembly drawing, the process drawing shall be drawn and shall meet the requirements of the parts drawing and the process data. The dimensions guaranteed by the next process shall be marked on the drawing with the words "process size". If, after the molding, the burr is not repaired, no other machining process is performed, and the process drawing is exactly the same as the drawing of the product.
Under the process chart, it is better to mark the part number, name, material, material shrinkage, drawing ratio, etc. Usually the process drawings on the mold assembly drawing.
1. Draw the assembly structure
Draw the assembly drawing as much as possible with a 1:1 ratio. The drawing starts with the cavity and the main view is drawn at the same time as the other views.
(1) The mold assembly drawing should include the following:
1) mold forming part structure
2) Structure of gating system and exhaust system.
3) Parting surface and parting mode.
4) Overall structure and position of all connectors, positioning and guides.
5) Mark the height dimension of the cavity (not required, as required) and the overall size of the mold.
6) Auxiliary tools (removal mold release tools, calibration tools, etc.).
7) Edit all the part numbers in sequence and fill in the schedule.
8) Mark technical requirements and instructions for use.
(2) Technical requirements for the mold assembly drawing:
1) Performance requirements for some systems of the mold. For example, the assembly requirements for the ejector system and the slider core pulling structure.
2) Requirements for the mold assembly process. For example, the bonding gap of the bonding surface of the parting surface after mold assembly shall not be greater than the parallelism requirement of the upper and lower sides of the mold, and the size determined by the assembly and the requirements for the size shall be specified.
3) mold use, assembly and disassembly methods.
4) Anti-oxidation treatment, mold number, lettering, marking, oil seal, storage and other requirements.
5) Requirements related to test mode and inspection.
2. Draw all part drawings
The order of dismantling the parts drawing from the mold assembly drawing shall be: first inside and outside, firstly complex and then simple, first forming the parts, and the latter parts.
(1) Graphic Requirements: Be sure to draw the scale, allowing zooming in or out. The view 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 consistent with the assembly drawings as far as possible, and the graphics should be clear.
(2) The dimensioning requirements are uniform, centralized, orderly, and complete. The dimensioning order is: the primary part size and the draft angle are marked first, then the matching dimensions are marked, and then all dimensions are marked. Label the fit dimensions on the non-primary part drawing, then label all dimensions.
(3) Surface roughness. The most applied roughness is marked in the upper right corner of the drawing, as indicated by the "Remaining 3.2." Other roughness symbols are marked on each surface of the part.
(4) Other content, such as part name, mold drawing number, material number, heat treatment and hardness requirements, surface treatment, graphic proportion, free dimension machining accuracy, technical description, etc. must be filled in correctly.
Second, proofreading, reviewing drawings, tracings, send to the sun
1. Contents of self-proofing:
(1) The relationship between mold and its parts and plastic parts drawings
Whether the material, hardness, dimensional accuracy, and structure of the mold and mold parts meet the requirements of the drawings.
(2) plastic parts
Whether plastic flow flow, shrinkage, weld marks, cracks, draft angle, etc., affects the performance of plastic parts, dimensional accuracy, surface quality, etc. Whether the pattern design is insufficient or not, whether the processing is simple, and whether the shrinkage rate of the molding material is selected correctly.
(3) molding equipment
The injection volume, injection pressure, and mold clamping force are insufficient. Whether the mold is installed, the south core of the plastic parts, or the mold release is in question, and whether the injection nozzle and the nozzle cover are in correct contact.
(4) mold structure
1) If the position of the parting surface and the precision of finishing meet the requirements, will flash occur. After the mold is opened, whether or not the plastic parts can remain on the side of the mold with the ejection device can be ensured.
2) Whether the demoulding method is correct and whether the size, position, and quantity of the promotion rod and the push tube are appropriate. The push plate will not be caught by the core, and it will not cause scratches on the molded parts.
3) mold temperature adjustment. Heater power, quantity; whether the cooling medium flow line position, size, quantity is appropriate.
4) How to deal with undercuts on plastic parts, and whether the mechanism for removing undercuts is appropriate, such as whether the sliders and push rods in the slanted guide core-pulling mechanism interfere with each other.
5) The position and size of the pouring and exhaust system are appropriate.
(5) Design drawings
1) Whether the position of each mold part on the assembly drawing is appropriate or not is indicated clearly or not.
2) The part number, name, production quantity, part internal or external purchase on the parts drawing are standard parts or non-standard parts, and the correction processing and margin of the parts with the processing precision and the high-precision dimensions of the molded plastic parts, The material, heat treatment, surface treatment, and surface finish of the mold parts are marked and clearly described.
3) The main parts of the parts, the working dimensions of the molded parts and the matching dimensions. The size figures should be correct and should not be converted by the producer.
4) Check the position of the view of all parts and assembly drawings, whether the projection is correct, and whether the painting method conforms to the national standard of drawing and whether there is any missing size.
(6) Check processing performance
Does all part geometry, view drawing, dimensions, etc. facilitate processing?
(7) Main work size of the recalculation aid
1) Professional proofreading is carried out in accordance with the designer's self proofreading project; however, it should focus on structural principles, process performance and operational safety aspects.
At the time of drawing, you must first digest the graphic, draw it according to the requirements of the national standard, and fill in all the dimensions and technical requirements. Self-education after signing and signing.
2) Submit the well-characterized base map to the designer for proofreading and signing. The customary practice is to review by the relevant technical personnel of the tool manufacturing unit, sign the contract, check the manufacturing process, and then send it to the sun.
(8) Writing a Manufacturing Process Card
The manufacturing process card is prepared by the tool manufacturer's technicians and is ready for processing.
In the manufacturing process of mold parts, inspections must be strengthened and the focus of inspection should be on the dimensional accuracy. After the mold assembly is completed, the inspector conducts the inspection according to the mold inspection table. The main point is to check whether the performance of the mold parts is in good condition. Only in this way can the quality of the mold be guaranteed.
Third, test mode and repair mode
Although the mold design is performed under the expected process conditions when the molding material and molding equipment are selected, people's understanding is often imperfect. Therefore, after the mold processing is completed, the mold test is performed and the molded parts are observed. How is the quality? Always find out afterwards that the wrong correction is done.
There are many kinds of plastic products that have bad appearances, and the reasons are also very complex. There are reasons for molds, and there are also reasons for the process conditions. The two are often handed over together. Before repairing the mold, careful analysis and study should be conducted according to the actual conditions of the plastic parts, and the remedial measures should be proposed after finding the cause of the defects of the plastic parts. Because the molding conditions are easy to change, the general practice is to first change the molding conditions. When changing the molding conditions does not solve the problem, it is considered to repair the mold.
Repairing molds should be more prudent and not very sure not to act rashly. The reason for this is that once the conditions of the mold have been changed, it will not be possible to make major changes and restitution.
The performance of the parts is good, only in this way can the manufacturing quality of the slang molds.
Fourth, organize data for archiving
After the mold has been tested, if it is not used temporarily, it should be completely wiped off the mold slag, dust, oil, etc., coated with butter or other anti-rust oil or rust inhibitor, closed to the storage place.
Start design molds until the molds are successfully machined and the inspections pass. The technical data generated during this period, such as the task book, parts drawings, technical specifications, mold assembly drawings, mold parts drawings, base drawings, mold design specifications, and inspection records Table, trial die repair records, etc., according to the provisions of the system collation, binding, numbering for archiving. This may seem like a hassle, but it is useful for repairing molds and designing new molds.
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