Mold Design and Manufacturers
Basic knowledge of mold design, old workers do not know 2019-06-17

01 Common plastic engineering materials and shrinkage?

ABS:0.5%(super glue free)

PC :0.5% (bulletproof glass glue)

PMMa:0.5% : (plexiglass)

PE: 2% polyethylene

PS:0.5%(polyphenylethylene)

Pp :2%(100% flexible adhesive)

PA: 2% (nylon)

PVC: 2% (polyvinyl chloride)

POM: 2% (steel)

ABS + PC: 0.4%

PC + ABS: 0.5%

Engineering materials: ABS PC PE POM PMMA PP PPO PS PET


02 What are the major systems of the mold?

Casting → ejecting → cooling → molding → exhaust


03 What problems should be paid attention to in the process of mold design?

(1) the wall thickness should be uniform as far as possible, and the stripping slope should be large enough.

(2) the transition part shall be gradual, smooth and avoid sharp corners.

(3) gate.The runner should be as wide and short as possible, and the gate position should be set according to the contraction and condensation process.

(4) the surface of the mold should be clean and smooth with low roughness (0.8 is the best).

(5) vent holes and slots must be adequate to expel air and gases from the melt.

(6) except PET, the wall thickness should not be too thin, generally not less than 1mm.


04 Lump of plastic often occurs?

Lack of glue → mantle → bubble → shrinkage → weld mark → black dot → striation → warping → layering → peeling


05 Common plastic mold steel?

45# S50c 718 738 718H

738H P20 2316 8407 H13

NAK80 NAK55 S136 S136H SKD61


06 What kind of material is used for high mirror finish?

Commonly used high hard heat treatment steel, such as: SKD61, 8407, S136


07 What are the structures of the formwork?

Panel →A plate →B plate → square iron → guide post → thimble plate → thimble fixing plate → bottom plate


08 What are the basic forms of the parting surface?

Flatness → inclination → curved surface → perpendicular → cambered surface


09 How do you hide each other in UG?

CtrL + B or ctrL + shift + B


10 What are the mould processing machinery and equipment?

Computer gong lathe milling machine grinder drilling machine.


11 What is 2D and what is 3D?

D Dimension, 2D refers to the two-dimensional plane, 3D refers to the three-dimensional space, in the mold section, 2D usually refers to the plane drawing (CAD drawing), and 3D usually refers to the three-dimensional drawing.


12 What is the default accuracy of pro/e?What is the UG default accuracy?

The default accuracy of pro/e is 0.0012MM and UG is 0.0254MM.


13 Global mold frame production four strong enterprises?

Germany: HASCO Japan: FUTABA us: DME China: LKM (dragon)


14 What is the default word height for CAD?

The default CAD word height is 2.5mm.


15 What is impingement? What is impingement?

The mating surface of male and female dies parallel to the PL surface is called the penetrating surface, and the mating surface uneven to the PL surface is called the inserting surface.


16 The relationship between strips and silk

Both strips and silk are length units, and the strips are used in Taiwan language, 1 strand =0.01MM, while the silk is used in Hong Kong language, 1 strand =0.01MM, so 1 strand =1 strand.


17 What is a pillow position?

The edge of the shell is often open a gap, used to install all kinds of accessories, the pillow formed here strong parting part known as the pillow position.


18 What is the crater?

The type of plastic reduction at the root of the BOOS column reflected in the mold is called the mold crater after the volcanic eruption.


20 What is tiger mouth?

Tiger mouth also known as: tube position, that is used to limit the position of the part.


21 What is rank?

The product layout on the mold is called placement.


22 What is glue position?

The holes in the mold are called glue positions.


23 What is a bone position?

The tendon on the product is called the bone position


24 What is a columnar position?

The BOSS's column on the product is called the column position.


25 What is the imaginary bit?

The gap in the mold is called the virtual bit.


26 What is the buckle position?

The hook used for connection on the product is called the buckle position.


27 What's a fire pattern?

After edm processing, the left as fire pattern.


28 What PL side?

PL surface, also known as parting surface and snap ramen, refers to the part where the front die and the back die contact when the die is closed.


29 What is a computer gong?

CNC milling machine and machining center


30 What is a coppersmith?

Electrical discharge electrode is usually made of easy to process copper material, known as copper, also known as the electrode, copper is generally divided into: rough, rough, young, young, also known as seiko.


31 What is the usual spark bit?

In the discharge process, the discharge gap between copper and steel is called spark bit, rough spark bit is generally 10 to 50, young spark bit is generally 5 to 15 (welcome to pay attention to WeChat: automotive technologist).


32 What is the material level?

Plastic products avoid thick, also known as thick meat.


33 What is the original body?

The original body is relative to cutting insert, the original body is a whole piece of steel for processing rough material, processing together.


34 What is a weld mark?

The line formed when two strands of plastic meet is called a weld mark.


35 What is a jet?

Plastic from the plastic into the cavity into the mouth after the formation of a curved fold like a snake flow mark called jet.


36 What is the LKM?

LKM refers to longji mould blank, commonly used mould blank are: LKM, fudeba, mingli, huansheng, changhui, tecsun.


37 What is DME? What is HASCO?

Both the DME and the LKM are standard parts. The DME is made in the United States, and HASCO is made in Europe.


38 What do you mean inverted?

The part of the front and back mould that cannot be directly demoulded in the product is inverted.


39 What does prevent stay?

Prevent foolish is a kind of idiomatic expression, it is to prevent occurrence a kind of very simple mistake, prevent daze!For example: a set in the world side do have the same size hanging platform, site assembly is likely to put the world side installed on the opposite side, but he did in the side of the piece to hang platform, at this time, if the world side anti outfit can not go in, want to install the wrong is impossible, this kind of prevent the occurrence of daze and the wrong action become daze.


40 What's a beer machine?

Beer machine is a local idiom, that is, we often say the injection molding machine, molding machine.


41What do you mean stop?

Stop is the clip art line, also known as the line.


42 What is flying mode?

Flying mode is the matching mode or standard mode.


43 What is a light knife?

CNC finishing action known as smooth knife, that is, on the basis of rough machining in place.


44 What do you mean open box?

The action of processing the position of the mould kernel on the mould blank is called opening the box.


45 What is the word "hang"?

Sun word is put in the film and then go to the processing font font.


46 What is the inverse?

Under normal circumstances, the front and back of the mold material level inverted opening method known as anti - ha.


47 What is floating?

The part with inverted buckle USES the small insert to pop out of the mold method called floating machine.


48 What do you mean front molds?

When the mold is opened, the product is left in the front mold.



49 What is top white?

When ejecting the required die force is large, the thimble is not strong enough, so that the product is partially damaged, from the front of the product, there is an obvious white is the top white, also known as the top high nozzle.


50 What is drying print.

The marks left on the surface of the making point when diving into the water are called drying marks.


51 What's a yard boy?

Yard is a clamping tool, a triangular bevel slot pad.


52 What does over cut mean?

Overcutting refers to excessive cutting, that is, when processing the workpiece does not need to be processed parts are also processed, overcutting is not good.


53 What's a school cup?

Front die pop open inside position.


54 What's a tooth?

Tapping. Tapping is called a tap.


55 When do we need to make the two-color mould?

When a product contains two different materials or different colors of the same material, design two-color mold forming.


56 What is the mold design process of the factory?

Provide product figure to analysis product, confirmation and varieties of plastic mould material to turn engineering drawing, take the shrink as mirror phase to improve the assembly drawing, order the mold base - cavities material to draft, 3 d die to determine the flow/gate way to refer to figure for structural design of qualifying, down the insert to correct the 3 d, engineering drawing "include: mould kernel/insert/mold/parts" to do the BOM table, proofreading approval.

57 How many ways are there to remove the mold?

Shun tao and qiang tao


58 What are the ways of gluing?

Direct gluing → lap gluing → side gluing → ring advancing gluing → sheet gluing → latent gluing → point gluing → horn gluing → sector gluing.


59 What are the flow channels?

There are circular runner → semicircle runner →T runner → regular hexagonal runner.


60 Manual and book for mould designer?

Steel books,plastic books,mold standard parts books.


61 What does the spring do?

Rebound occurs when applied externally


62 Why should the mold be drawn?

Prevent the product from being pulled out of mold.


63 Screw function and matching length determination?

Mainly play a tight fixing role, with the length of 1.5 to 2 times the diameter of the screw.


64 What is the slope of the slider, what is the slope of the guide column?

The slope of the slider is generally 20 degrees, and the slope of the guide column is 18 degrees.


65 The role of the cold well?

The purpose of the cold well is to store a small portion of the cooler plastic material that enters the mold first.


66 The role of the positioning ring?

The function of the positioning ring is to ensure the correct relative position between the mould and the injector.


67 Relative position of fit?

There are three kinds of fit: gap fit, transition fit and interference fit.


68 What is the function of inserts?

Convenient processing, prevent carbon accumulation, benefit to polishing, save material, help exhaust gas, easy to replace, reduce processing machine.


69 What are the hardness indicators?

Hardness refers to a material's ability to resist hard objects pressing into its surface. The commonly used hardness indicators are brinell hardness, rockwell hardness and vickers hardness.


70 Can I draw the surface?Can the group be extracted?Can the face group be replaced?

Surface can not be pulled out of the mold, the group can be pulled out of the mold, the group can be replaced.


71 What's the difference between the first Angle method and the third Angle method?

(1), where the object placed in the first quadrant, to {point of view} (observer) → (object) → (projector) relationship and projection view of the painting, that is called the first corner method, also known as the first quadrant method.

(2), where the object placed in the third quadrant, to {view} (observer) → (projective plane) → (object) relationship and projection view painting method, that is called the third Angle method, also known as the third quadrant method.

Note: the difference between the first corner method and the third corner method is the view placement article.

Left view on the right, right view on the left, top view on the bottom, and so on...

Third corner: left view on left, right view on right, top view on top, and so on...


72 How many ways are there to transport water?

Water transport commonly used are: straight - through, encircling, water tower, spiral.


73 What are the basic principles of the three views?

The basic principles of the three views are: length to right, height to level, width to equal.


74 What are the types of injection machines?

By shape;Vertical, horizontal, "these two most commonly used" according to the amount of injection molding is divided into: ultra-small injection molding machine, small injection molding machine, medium injection molding machine, large injection molding machine, super large injection molding machine.That is, the injection amount varies from a few milligrams to dozens of kilograms, according to the clamping force: several tons to several thousand tons (welcome to the attention of automotive technologist WeChat auto1950).


75 What is the relationship between clamping force and supporting force?

The clamping force of the injection molding machine should be greater than the supporting force, otherwise the mold will be pushed open by internal pressure.


76 What are the positioning methods of male and female models?

There are two types of positioning modes: template positioning and kernel positioning.


77 What is the proper wall thickness for commonly used plastics?

The appropriate wall thickness for ABS is 1.8 -- 3mm, for PC is 2 -- 3.5mm, for POM is 1.5 -- 2.5mm and for NoryL is 2 -- 3.5mm


78 What is an overflow value?

Overflow boundary value refers to the plastic products is under how much clearance will overflow, (that is, to run the flash), a number of ABS overflow value is: 0.04 mm, PC of overflow boundary value AS follows: 0.06 mm, pA of overflow boundary value AS follows: 0.015 mm, the suitable thickness of POM is: 0.04 mm, PBT + 15% GR of overflow boundary value AS follows: 0.03 mm, PBT + 30% of overflow boundary value: 002 mm, PMMA of overflow boundary value AS follows: 0.065 mm, PVC of overflow boundary value AS follows: 0.07 mm, AS of overflow boundary value AS follows:The overflow value of ps is 0.05mm, the overflow value of pp is 0.03mm, and the overflow value of PE is 0.02mm.


79 How big is the standard frame?

Commonly used picture boxes are: A0,A1,A2,A3,A4. The size of picture boxes of A0 is: 1189mx841m, the size of picture boxes of A1 is: 841mx594mm, the size of picture boxes of A2 is: 594mmx420mm, the size of picture boxes of A3 is: 420mmx297mm, and the size of picture boxes of A4 is: 297mmx210mm


80 Mold size planning?

The standard of mold size planning of each company is different, but the common standard is divided as follows: the mold of 15 -- 30 series mold blank is classified as small mold, the mold of 30 -- 50 series mold blank is classified as medium mold, and the mold of 50 series mold blank is classified as large mold.


81 What is elastic deformation?What is plastic deformation?

The object deforms under the action of external force, when the external force disappears, the object can return to the deformation before deformation is called elastic deformation, when the external force disappears, the object cannot return to the deformation before deformation is called plastic deformation.


82 What materials are used in the mold?

Die commonly trump steel (Hong Kong name), trump is carbon steel, 45 steel.


83 What is the difference between CAD drawing work model space and layout space?

Model space is the space for graphic entities, layout space is the space for the layout of drawings.


84 What is the purpose of carrying water?

The function of transporting water is to control the temperature of mould kernel.


85 What is the mold?

In industrial production, with a variety of presses and special tools installed on the pressure machine, through the pressure of metal or non-metal materials to make the required shape of parts or products, such special tools are collectively referred to as molds.


86 Mold classification?

Mould generally can be divided into the plastic mold and plastic mold, the plastic mold are: casting die, forging die, stamping mold, die-casting mould, plastic mould according to the production process and production product is divided into different (welcome attention WeChat: intuitive learning machine), injection molding mould, blow molding, compression molding, transfer molding mould, extrusion molding, thermoforming mould, rotational molding mould, depending on the system of pouring system type mould can be divided into three categories: gate mold, fine runner mold, hot runner mold.


87 What is a pouring system?

The plastic flow channel from the injector nozzle to the mold cavity is called the pouring system.


88 What is reverse engineering?

Reverse engineering is a high speed 3 d laser scanner for existing accurate, high-speed scanning sample or model, the 3-d contour data, get the cooperate with reverse software march to the refactoring, and to reconstruct the surface precision of online analysis, evaluate the efficacy of the structure, the resulting IGES or STL data, can according to the time for rapid prototyping or CNC numerical control processing.


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