Injection Mold Production and Maintenance Operation Guide

1、 Production mold number

1. The mold number must be processed using a milling machine above the outer end face of the mold blank (square iron), with a height of 40mm and a depth of 0.5mm, and the font should be in an equal line font.

2. Each template must be labeled with a mold number using a font code, and the direction should be consistent.

3. All screws, hanging ring holes, and mold components of the mold must be of metric specifications, while the processed mold accessories must be of standard specifications and self made is prohibited.

2、 Prying position

1. Each set of molds is milled with four corner prying positions on the B board (moving template) for use in FIT mold and mold repair.

3、 Code pit

1. Non I-shaped mold blanks require milling of code mold slots in the front and rear molds, and the specific size depends on the mold design size.

4、 Code mold screw hole

1. Each set of molds should have code mold holes on the moving mold base plate and fixed mold panel.

2. The hole spacing size needs to be determined based on the injection model

5、 Top stick 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 need to have one top stick hole, medium molds must have at least three top stick holes, and large molds require five holes

3. The diameter and position of the top rod are based on the actual size of the injection machine (design size)

6、 Positioning ring

1. Each set of molds must be equipped with positioning rings (i.e. positioning flanges) to facilitate mold positioning

2. The size of the positioning ring should be determined based on the aperture of the injection molding 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 the mold and machine board is 100mm-0.20 ^ -0.40mm

7、 Reset the device first

1. When the ejector pin cylinder is related to the row ejector device, a first reset device must be installed on the mold, and the ejector pin plate should not be reset solely by the spring to avoid spring failure and collision between the row position (core pulling) and the ejector pin cylinder in the future.

2. A travel switch must be installed between the ejector pin plate and the moving template to ensure that the reset device is effective before powering on and closing the mold.

8、 Ejector plate guide pillar guide sleeve

1. The length of the ejector pin plate is 12 or more, or the positioning of the mold is off center

2. Equipped with many small thimbles with a diameter of less than 2mm

3. Equipped with more cylinders (more than 10)

4. In all three cases, four guide pillars and guide sleeves must be added to the ejector pin plate to ensure that the ejector pin can evenly and smoothly eject the rubber component.

9、 Top needle plate spring bow

1. All molds must be equipped with four reset slingshots on the ejector pin plate to help the ejector pin retract evenly

2. Using a plastic mold dedicated blue slingshot, reset the slingshot and grind both ends flat

3. The reset slingshot cannot compress more than 40% of the free length, and four ejection limit nails need to be made on the ejector pin panel with the rubber part effectively ejected

4. To fix the reset slingshot, both ends must have fixed sinking holes. It is prohibited to use unreliable methods of sinking holes at one end and grinding the surface at the other end.

10、 Automatic dehydration device

1. The fine nozzle mold (three plate mold) must be equipped with a pull rod, pull rod, or return pin to ensure that the nozzle plate and A plate automatically fall off when they move to the nozzle.

2. The thickness of the material used for the pull rod is 10mm or above

3. The diameter of the tension screw should not be less than 8-14mm

4. Using B board (dynamic template) with 4 nylon glue nails (nylon pulling machine) on the surface, the effect is safe and reliable, economical and practical.

11、 Thimble action

1. It should be ensured that the beer parts are reliably ejected in any situation, and that they are not related to other mold parts and are reset before mold closing

2. When ejecting, the beer part should not deform, and the phenomenon of white top and sticking should be quickly ejected without affecting the appearance quality of the beer part with the marks of the ejector pin.

3. Ejection should be balanced and smooth, and there should be no tilting of the ejector pin plate. Ejection should not produce any noise

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 (line position) should be smooth, ensuring that the shape remains unchanged, and there should be no dead movement, unevenness, looseness, or other phenomena;

2. The guide surface of the large sliding block should have oil grooves;

3. The large slider must have a cooling channel;

4. The slider and sliding 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 base. 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 gap between the inclined guide pillar hole and the inclined guide pillar must be left at least 0.2mm, and matching of the same size is prohibited;

7. The angle of the inclined guide pillar is less than the slope of the row position wedge by 2 degrees. The wedge block of the large slider must extend 15-20mm into the lower mold and interlock with a 10 degree slope to counter press.

8. The cavity of the combination of circular slide blocks has a difference of 2 degrees in the angle and inclination column angle between the longitudinal and wedge tight surfaces of the slide blocks. It is prohibited to use the same degree. The final positioning of the slide block above the mold must be pushed or pulled by a slingshot, and wave beads cannot be used in form to prevent the slide block from colliding with the wedge tight block and the inclined guide column during mold closing.

9. Wear resistant plates must be installed on the friction surfaces of all rows, with a length of ≥ 30mm and a width of ≥ 50mm. The fine row position and row position pressing plate need to be quenched and hardened at least 52 degrees, while the large row position needs 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 for large molds are equipped with hanging screw holes, or both sides are required.

14、 Material channel shape

1. In principle, an O-shaped (circular) material channel is used;

2. Adopt trapezoidal material path in special circumstances;

3. The cross-sectional size of the material channel opening is usually determined by the product size and the number of inner cavities of the mold, and the specific size is determined according to the mold design drawing;

4. There are various shapes and styles of material channel openings, usually including flat, flat, point casting, submersible, and three or four claw point casting. The specific size of the material channel opening should be positive or negative according to the actual product size. When opening the material channel opening, the flow should be evenly distributed. Generally, the further away from the main channel, the material channel opening gradually increases. For the fine water outlet point casting, the navel eye should be retained in principle. Generally, when entering the water during flat joints, the material channel opening should be tilted, To avoid increasing auxiliary labor workload after the product glue leaves the water outlet.