Production and maintenance instructions for injection molds

【Summary】:

Production and maintenance instructions for injection molds

First, make the mold number

1. The mold number must be processed by a milling machine above the outer end face of the mold blank (square iron), the character height is 40mm, the depth is 0.5mm, and the font is contour.

2. Each template must be marked with the mold number and the direction is uniform.

3. All screws, ring holes and mold parts of the mold must be metric specifications, while the accessory parts of the processing mold must be of standard specifications. Self-made is prohibited.

Second, the skid position

1. Each set of molds is equipped with four corners on the B-plate (moving plate) for skid mold positions for FIT mold and mold repair.

Third, the code pit

1. The non-I-shaped mold blanks need to be milled in the front and rear molds, and the specific size depends on the mold design size.

Fourth, the code screw hole

1. Each set of molds must have code holes in the bottom plate of the movable mold and the fixed mold panel.

2. The hole size needs to be determined according to the injection model.

Five, top stick hole

1. The bottom of the movable mold must be opened with a sufficiently large stick hole, diameter Φ25 ～ 40mm

2. Small molds only need to open one top stick hole, medium molds must open more than three top stick holes, and large molds need to open five holes.

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

Six, positioning circle

1. Each set of mold must be equipped with a positioning ring (that is, a positioning flange) to facilitate the positioning of the mold

2.The size of the positioning ring should be determined according to the wall diameter of the injection model.

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) of the mold and the plate is 100mm-0.20 ^ -0.40mm

Seven, reset the device first

1. When the ejector cylinder interferes with the row ejection device, a reset device must be provided on the mold, and the ejector plate is not reset by relying on the spring, so as to prevent the spring from failing in the future, the ejection position (core drawing) and the ejector cylinder Collide.

2. A travel switch must be installed between the ejector plate and the movable template to ensure that the device can be reset before the power is turned on and the mold is closed.

Eight, thimble plate guide post guide sleeve

1. The thimble plate is 12 or more in length, or the mold is positioned in the middle

2. Configure more small thimbles and the diameter is below 2mm

3. Configure more tubes (more than 10)

4. In the above three cases, four guide posts and guide sleeves must be added to the ejector board to ensure that the ejector pin ejects the plastic parts in a balanced and stable manner.

Nine, thimble plate spring bow

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

2. Special blue slingshot made of plastic mould, both ends of reset slingshot are smoothed.

3. The reset slingshot cannot be compressed more than 40% of the free length. Four ejection limit pins must be made on the ejector panel under the effective ejection of the plastic part.

4. To reset the slingshot, the counterbore must be fixed at both ends. The unreliable method of grinding the counterbore at one end and grinding at the other end is prohibited.

Ten, automatic dehydration device

1. The small nozzle mold (three-plate mold) must be equipped with tie rods, pull bars or return pins to ensure that the nozzle plate and the A plate move to the nozzle and fall off automatically.

2.The thickness of the pull bar is 10mm or 12mm or more.

3, the diameter of the pull screw must not be less than 8-14mm

4. Adopt 4 nylon rubber nails (nylon drawing machine) on the surface of B plate (moving template), the effect is safe and reliable, economical and practical.

Eleventh, thimble action

1. Make sure that the beer part is ejected reliably in any occasion, and that it is reset without interference with other mold parts before the mold is closed.

2. The beer pieces cannot be deformed during ejection. The ejection and jamming phenomenon are quickly ejected and the ejector traces do not affect the appearance quality of the beer pieces.

3. The ejection should be balanced and smooth, and the ejector plate should not tilt, and there should be no noise in the ejection.

4. After ejection is completed, the ejector pin should automatically retract (except for special molds).

Twelve, position action

1.The movement of the slider (line position) should be smooth, to ensure that the shape does not change, and no dead movements, unevenness, looseness, etc. should occur;

2.The sliding surface of the large slider must have an oil groove;

3.The large slider must have a cooling water channel;

4. HVE6 is used in cooperation with the slider and the slide part, and it should not be too loose;

5. When the sliding stroke length of the slider is too long, it must be guided on the mold base. Generally, the length of the sliding part should be about 1.5 times the width. When the core is pulled, the slider needs to have a slider. 2/3 of the sliding part is in the guide chute;

6, the oblique guide post hole and oblique guide post cooperation must leave a gap of more than 0.2mm, the same size is prohibited;

7. The angle of the slope guide column is less than the slope of the row clamping surface by 2 degrees. The clamping block of the large slider must extend into the lower mold by 15-20mm and interlock and back pressure with a 10-degree inclined surface.

8. For the cavity of the round surface slider combination, the angle between the vertical and the clamping surface of the slider and the angle of the slope column are 2 degrees. The same degree is prohibited. The final positioning of the slider above the mold must be pushed or pulled with a slingshot. In the form, wave beads can not be used, so as to prevent the slider from hitting the clamping block and the oblique guide post during mold clamping.

9. The rubbing surface of all rows must be equipped with wear-resistant plates. The rubbing surface is ≥30mm in length and 50mm in width. The fine line position and line position press plates need to be quenched and hardened above 52 degrees, and the large line position should be nitrided or hardened according to the requirements before mold opening.

Thirteen, hanging hole

1.The small molds A and B are provided with screw holes for the mold;

2. All the templates of large molds are made with screw holes for hanging molds, or both sides are required.

Fourteen, the shape of the material channel

1.In principle, use O-shaped (round) material channel;

2.Use trapezoidal material channel in special cases;

3. The section size of the sprue mouth is usually determined according to the product size and the number of faces of the mold cavity. The specific size is determined according to the mold design drawing;

4. The shape of the spout opening is various, usually flat, flat, spot pouring, diving, three or four claw point pouring. The size of the specific spout opening is positive or negative with the actual product size. The flow rate should be distributed when opening the opening Uniform, usually farther away from the mainstream, the material inlet gradually increases, and the thin nozzle is poured. In principle, the navel eye should be retained. Generally, the material inlet should be opened obliquely when entering the water.