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1、 Mold production number
1. The mold number must be machined with a milling machine above the outer end face of the mold blank (square iron), with a font height of 40mm, a depth of 0.5mm, and an isometric font.
2. Each template must be labeled with a mold number using a character code, and the direction must be consistent.
3. All screws, hanging ring holes, and mold components of the mold must be metric specifications, and the processed mold accessories must be standard specifications. Self made molds are prohibited.
2、 Pry mold position
1. Each set of molds is milled out at four corners on the B plate (moving template) for mold lifting and repair purposes.
3、 Code pit
1. Non I-shaped mold blanks need to be milled with code grooves in the front and rear molds, and the specific size depends on the mold design dimensions.
4、 Code mold screw hole
1. Each set of molds must have code mold holes on the moving mold base plate and fixed mold panel.
2. The hole spacing size needs to be determined according to the injection machine model
5、 Top rod hole
1. The bottom of the moving mold must have a sufficiently large top rod hole with a diameter of Φ 25-40mm
2. Small molds only require one top rod hole, medium-sized molds must have at least three top rod holes, and large molds require five holes
3. The aperture and position of the top stick are based on the actual size (design size) of the injection machine model
6、 Positioning Circle
1. Each set of molds must be equipped with positioning rings (i.e. positioning flanges) for mold positioning,
2. The size of the positioning ring should be determined based on the aperture of the injection molding machine wall panel,
3. The diameter tolerance of the positioning ring is 0.2-0.4mm, and the minimum height of the protruding mold panel is 8-10mm,
4. The standard size of the positioning ring (flange) for molds and machine boards is 100mm-0.20 ^ -0.40mm,
7、 Reset the device first
1. When the ejector pin barrel is related to the row position ejector device, a reset device must be installed on the mold, not relying solely on the spring to reset the ejector pin plate, in order to avoid future spring failure and collision between the row position (core pulling) and the ejector pin barrel.
2. A travel switch must be installed between the top pin plate and the moving template to ensure that the reset device is effective before powering on and closing the mold.
8、 Top needle plate guide column guide sleeve
1. The top needle plate is 12 or longer, or the position of the mold is off center
2. Configure multiple small top pins with a diameter of less than 2mm
3. Equipped with more than 10 cylinders,
4. In the above three situations, four guide posts and guide sleeves must be added to the ejector pin plate to ensure that the ejector pin can push out the rubber parts evenly and smoothly.
9、 Top needle plate spring bow
1. All molds must have four reset slingshots installed on the ejector pin plate to assist in the uniform retraction of the ejector pin,
2. Using a blue slingshot with plastic molds, the two ends of the reset slingshot are ground flat,
3. The reset slingshot cannot be compressed by more than 40% of its free length, and four ejector limit pins need to be made on the ejector pin panel under the condition that the rubber part is effectively molded
4. To reset the slingshot and fix it, both ends must have fixed sinkholes. It is forbidden to use unreliable methods such as one end having a sinkhole and the other end grinding the flat surface.
10、 Automatic dehydration device
1. The fine water nozzle mold (three plate mold) must be equipped with a pull rod, tension bar or return pin to ensure that the water nozzle plate and A plate move automatically and fall off when the water nozzle is reached.
2. The thickness of the material used for the pull strip is 10mm or 12mm or more,
3. The diameter of the pull screw should not be less than 8-14mm,
4. The B-board (dynamic template) is equipped with 4 nylon rubber nails (nylon puller) on the surface, which is safe, reliable, economical and practical.
11、 Top needle action
1. It should be ensured that the beer can be reliably ejected in any situation, and it should be reset without interference with other mold parts before closing the mold,
2. When ejecting, the beer should not be deformed, and the white and stuck phenomenon should be quickly ejected without affecting the appearance quality of the beer.
3. The ejection should be balanced and smooth, without tilting of the ejector pin plate, and there should be no noise generated during ejection
4. After the ejection is completed, the ejector pin should automatically retract (except for special molds).
12、 Row position action
1. The movement of the slider (row position) should be smooth, ensuring that the shape does not move in the same direction, and there should be no dead movement, unevenness, looseness, or other phenomena;
2. The sliding surface of the large slider should have an oil groove;
3. The large slider must have a cooling water channel;
4. The slider and slide seat are matched with HVE6 and should not be too loose;
5. When the sliding stroke length of the slider is too long, it is necessary to increase the guide on the mold seat. Usually, the length of the sliding part should be about 1.5 times the width. When pulling the core, the matching part of the slider in the guide groove should have 2/3 of the sliding part of the slider in the guide groove;
6. The clearance between the inclined guide column hole and the inclined guide column must be at least 0.2mm, and matching of the same size is prohibited;
7. The angle of the inclined guide column is 2 degrees less than the slope of the row position wedge surface. The wedge block of the large slider must extend 15-20mm into the lower mold and interlock with a 10 degree inclined surface for back pressure.
8. The cavity of the circular slider combination has an angle difference of 2 degrees between the longitudinal direction and the wedge surface of the wedge slider, as well as the angle of the inclined column. The same degree is prohibited. The final positioning of the slider above the mold must be pushed or pulled with a slingshot, and wave beads cannot be used in form to avoid the slider hitting the wedge block and inclined guide column during mold closing.
9. All mating surfaces of the rows must be equipped with wear-resistant plates, with a length of ≥ 30mm and a width of ≥ 50mm. Fine rows and row pressing plates need to be quenched and hardened by more than 52 degrees, while large rows need to be nitrided or hardened according to the requirements before mold opening.
13、 Hanging mold hole
1. Small molds A and B have hanging mold screw holes on both the upper and lower surfaces;
2. All templates of large molds are equipped with hanging screw holes, or both sides are required.
14 CAVNO.：
1. The parts with multiple cavities in the first mock examination must be marked with CAVNO on the non exposed surface and the fitting surface to show the difference. The CAVNO must be marked before the first mold test.
2. It is advisable to mark the location of the CAVNO. label after contacting the design engineer.
15、 Material channel shape
1. In principle, an O-shaped (circular) material channel is used;
2. In special circumstances, trapezoidal material channels are used;
3. The cross-sectional size of the material inlet is usually determined based on the product size and the number of faces inside the mold cavity. The specific size is determined according to the mold design drawing;
4. There are various shapes and styles of material outlets, usually including flat, flat, point pouring, submersible, and three or four claw point pouring. The specific size of the material outlet should be positive or negative compared to the actual product size. When opening the material outlet, the flow rate should be evenly distributed, usually increasing gradually as the distance from the main channel increases. For fine water outlet point pouring, the principle is to retain a navel. Generally, when entering the water, the material outlet should be inclined to avoid increasing the workload of auxiliary labor after the product glue leaves the outlet.
