Does everyone know about mold knowledge? Do you know the basic knowledge commonly used in mold design? Below, I will share with you the basic knowledge commonly used in mold design. Let's see how many you know!
What are the forms of runners?
There's a circular slide? Semicircular wheel? T runner? Regular hexagonal flow channel.
Mold designer standing manuals and books?
Steel books, plastic books, mould standard parts books.
What is the function of the spring?
When external use appears, it produces rebound force.
Why do you want to pull the mold?
Prevent the product from being pulled when demoulding.
What is the function of screw and the determination of fit length?
It is mainly used for tightening and fixing, and the fitting length is generally 1.5 to 2 times the screw diameter.
Common plastic engineering materials and shrinkage?
ABS:0.5% (unbreakable rubber)
Pc:0.5% (bulletproof glass glue)
PMMa:0.5% (plexiglass)
Polyethylene: 2% polyethylene
Polystyrene: 0.5% (polystyrene)
Polypropylene: 2% (100% soft rubber)
Nylon: 2% (nylon)
PVC: 2% (PVC)
Polyformaldehyde: 2% (plug steel)
ABS+PC:0.4%
PC+ABS :0.5%
Engineering material: ABS PC PE POM PMMA PP PPO PS PET
How many systems is the mold divided into?
Pouring ejection? Cooling? Molding? unleash
What problems should be paid attention to in the process of mold design?
1, the wall thickness should be as uniform as possible, and the demoulding slope should be large enough.
2, the transition part should be smooth and smooth transition, to prevent sharp corners.
3. the gate. The runner should be as wide and short as possible, and the gate position should be set according to the shrinkage and condensation process, and the cooling well should be added if necessary.
4. The mold surface should be smooth with low roughness (preferably 0.8).
5, exhaust holes, grooves must be enough, timely discharge of air and gas in the melt.
6. Except for PET, the wall thickness should not be too thin, generally not less than1mm. 。
Common defects of plastic parts?
Lack of glue? A cloak? Bubbles? Shrinkage? Welding marks? Black spots? Stripes? Tilt up? Hierarchy? shed a skin
Commonly used plastic die steel?
45# S50c 7 18 738 7 18H
738H P20 23 16 8407 H 13
nak 80 nak 55s 136s 136h SKD 6 1
What steel is used for high mirror polishing?
Commonly used high hardness heat-treated steels, such as SKD6 1, 8407, S 136.
What are 2D and 3D?
D is the prefix of dimension, 2D refers to two-dimensional plane, and 3D refers to three-dimensional space. In the mold part, 2D usually refers to the plan, that is, the CAD drawing, and 3D usually refers to the stereoscopic drawing.
What is the default precision of pro/e? What is the default precision of UG?
The default precision of pro/e is 0.00 12MM, and that of UG is 0.0254MM.
The top four enterprises in the world in terms of formwork production?
Germany: HASCO Japan: Shuang Ye (Shuang Ye) USA: DME China: LKM (Ji Long)
What is the default word height of CAD?
The default word height of CAD is: 2.5 mm
What is contact and what is penetration?
The mating surface of the male die and female die parallel to the PL plane is called the contact surface, and the mating surface of the male die and female die not parallel to the PL plane is called the insertion surface.
Relationship between strip and silk
Stripe and silk are both units of length. Stripe 1 =0.0 1MM in Taiwan Province Province and silk 1 =0.0 1MM in Hong Kong, so 1 = 1.
What is the position of the pillow?
There is often a gap on the edge of the plastic part of the shell for installing various accessories. The pillow-shaped parting part formed here is called pillow position.
What are the structures of the formwork?
Panel? A board? B board? Square iron? Guide? Thimble disk? Thimble fixing plate? sole
What are the basic forms of parting surface?
Straight man? Tilt? Surface？ Vertical? cambered surface
How to hide each other in UG?
CtrL+B or ctrL+shift+B
What are the mold processing machinery and equipment?
Computer gong? Lathe? Milling machine? Grinder? Drilling machine
What is a crater?
The shape of the root of BOOS column reflected in mold is called mold crater after volcanic eruption.
Oh, what does this mean?
Oh, it refers to the core, a Hong Kong idiom.
What is a tiger's mouth?
The tiger's mouth is also called: pipe position, that is, the part used for limiting.
What is ranking?
The product layout on the mold is called ranking.
What is a glue position?
The cavity of the product on the mold is called the glue position.
What is bone position?
The tendon on the product is called bone position.
What is a column position?
The column of BOSS on the product is called column position.
What is a virtual location?
The gap in the mold is called a virtual position.
What does buttoning mean?
The hook used for connection on the product is called the buckle position.
What is fire pattern?
The pattern left after EDM is called fire pattern.
What PL surface?
PL surface, also known as parting surface and Lamian Noodles, refers to the part where the front die and the back die contact when clamping.
What is a computer gong?
CNC Milling Machine and Machining Center
What is a copper worker?
EDM usually uses easy-to-process copper material as discharge electrode, which is called copper worker, also known as electrode. Copper workers are generally divided into rough workers, rough young workers, young workers and young workers, also known as Seiko.
What is the spark potential usually?
In the process of discharge, the discharge gap between copper workers and steel materials is called spark potential, and the spark potential of rough workers is generally 10 to 50, and that of young workers is generally 5 to 15.
What is the material level?
Avoid the thickness of plastic products, also known as thick meat.
What is the original body?
The retain force of that original body is relative to the cutting insert. Original body retention means that the whole piece of steel is a processing blank and is processed together during processing.
What are the weld marks?
The line formed when two strands of plastic meet is called weld mark.
What is a jet plane?
After the plastic enters the cavity from the glue inlet, it forms a serpentine flow mark, which is called jet.
What does LKM mean?
LKM refers to Ji Long moldy embryos, and commonly used moldy embryos are: LKM, Fordba, Li Ming, Huansheng, Changhui and Desheng.
What does DME mean and what does HASCO mean?
DME and LKM are standard parts, DME is made in America, and HASCO is made in Europe.
What is reverse buckle?
Parts of products that cannot be directly demoulded by the front and rear molds become inverted.
What is foolproof?
Anti-stupidity is an idiom, which means to prevent a very simple mistake and daze! For example, an insert has a hanging table with the same size on one side of the world. It is likely that the world will be upside down when assembling on site, but he makes a hanging table on the other side of the insert. At this time, if heaven and earth are installed backwards, it will not fit in, and it is impossible to install it wrong. This action to prevent mistakes caused by a daze becomes a daze.
What is a die-cutting machine?
Die-cutting machine is a local idiom, which is what we often call injection molding machine and molding machine.
What do you mean, shut up?
Sewing is sewing line, also called covering line.
What is a flight model?
Whether the flying die is a matching die or a standard die.
What is a laser scalpel?
The action of numerical control finishing is called light knife, which is to process in place on the basis of rough machining.
What do you mean by opening the box?
The action of machining the position of the die core on the die blank is called frame opening.
What do you mean by drying words?
Printing is to put it in film and add fonts to the processed fonts.
What do you mean by reverse?
The method of reversing the material surface of the front and rear molds under normal circumstances is called inversion.
What do you mean by floating?
The method of ejecting the mold with a small insert where there is a local back buckle is called floating.
What do you mean, eat it before it gets moldy?
When the mold is opened, the product stays in the front mold, which is called eating the front mold.
What is top white?
The die force required for ejection is large, and the ejector pin is not strong enough, which causes local damage to the product. From the front of the product, there is obvious white as the top white, also called the top high nozzle.
What is baking?
When diving, the marks left by the water entry point on the outer surface of the point are called baking marks.
What is a code boy?
The fixture belongs to a clamping tool, which is a cushion block with a triangular inclined opening groove.
What is overcutting?
Overcutting refers to excessive cutting, that is, when machining a workpiece, the parts that do not need to be machined are also machined. Excessive cutting is not good.
What is a school cup?
The front die bounces out of position in the open die.
What is a tooth click?
Pat. Tapping a thread is called clicking.
When do you need to make a two-color mold?
When a product contains two different materials or different colors of the same material, a two-color mold is designed for molding.
What is the mold design process of the factory?
Customers provide product drawings? Analyze products? Confirm the plastic variety? Confirm the mold material? Turn to engineering drawing? Take shrinkage as a mirror? Perfect the assembly drawing? Book a phantom? Ordering mold cores? Pull out the mold? 3D parting? Determine runner/gate mode? Structural design reference ranking chart? Remove the insert? Correct 3D? Engineering drawing "includes: mold core/insert/mold blank/part"? Make a BOM? Proofreading and auditing
There are several ways to demould.
Cis separation and forced separation
What are the gluing methods?
Put it directly in the glue? Grinding glue? Side glue? Ring glue? Film adhesive? Latent? Click on the glue? Croissant feed? Fan-shaped glue feeding.
What is the slope of the slider and the slope of the inclined guide post?
The slope of the slider is generally 20 degrees, and the slope of the inclined guide pillar is generally 18 degrees.
What is the function of cold material well?
The function of the cold material well is to store a small part of plastic material with lower temperature that enters the mold first.
What is the function of the locating ring?
The function of the positioning ring is to ensure the correct relative position between the mold and the injection machine.
What is the relative position of cooperation?
There are three types of fit: clearance fit, transition fit and interference fit.
What is the function of the insert?
Easy to process, prevent carbon deposition, benefit polishing, save materials, help exhaust, facilitate replacement, and reduce processing machines.
What are the hardness indicators?
Hardness indicates the ability of a material to resist hard objects pressing into its surface. Commonly used hardness indexes include Brinell hardness, Rockwell hardness and Vickers hardness.
Can the surface be drawn? Can the team draw the mold? Can I change the quilt?
Surfaces cannot be drafted, quilts can be drafted, and quilts can be replaced.
What is the difference between the first angle method and the third angle method?
(1), where the object is placed in the first quadrant, use {viewpoint} (observer)? (object)? (Projection plane) relationship and projection view, commonly known as the first angle method, also known as the first quadrant method.
(2) Where the object is placed in the third quadrant, is there a {viewpoint} (observer)? (projection plane)? The drawing method of projecting a view according to the relationship between objects is called the third quadrant method.
Note: The difference between the first and the third corner is the items placed in the view.
The first corner: the left view is on the right, the right view is on the left, the top view is on the bottom, and so on?
The third drawing method: the left view is on the left, the right view is on the right, the top view is on it, and so on?
How many ways to transport water?
Commonly used water delivery methods are: straight-through, round, water tower and spiral.
What is the basic principle of the three views?
The basic principles of the three views are: long alignment, high alignment and equal width.
What kinds of injection molding machines are there?
According to the shape; "Vertical", "horizontal" and "the two most commonly used" are divided into: ultra-small injection molding machine, small injection molding machine, medium injection molding machine, large injection molding machine and super-large injection molding machine. That is to say, the injection amount ranges from a few milligrams to dozens of kilograms, and it is divided into several tons to several thousand tons according to the clamping force.
What is the relationship between clamping force and formwork support force?
The clamping force of injection molding machine is greater than the supporting force, otherwise the mold will be opened due to internal pressure.
What are the positioning methods of male and female molds?
There are two ways to locate the front and rear molds: one is template positioning, and the other is mold core positioning.
What is the suitable wall thickness of ordinary plastics?
The suitable wall thickness of ABS is 1.8? 3 mm, the suitable wall thickness of PC is: 2? 3.5mm, POM, the appropriate wall thickness of POM is: 1.5? 2.5mm, the suitable wall thickness of NoryL is: 2? 3.5 mm
Classification of mold?
Generally speaking, molds can be divided into plastic molds and non-plastic molds. Non-plastic molds include casting molds, forging molds, stamping molds and die-casting molds, and plastic molds can be divided into injection molds, blow molds, compression molds, transfer molds, extrusion molds, thermoforming molds and rotational moulding molds according to different types of gating systems. According to the different types of gating system, molds can be divided into three categories: large nozzle mold, small nozzle mold and hot runner.
What is a gating system?
The plastic flow channel from the injection nozzle to the cavity is called gating system, which includes: main channel, shunt channel, gate and cold well.
What is reverse engineering?
Reverse engineering is to scan the existing samples or models accurately and at high speed with a high-speed 3D laser scanner, and get their 3D contour data. With the help of reverse engineering software, we can reconstruct the surface, analyze the online accuracy of the reconstructed surface, evaluate the construction effect, and finally generate IGES or STL data, which can be used for rapid prototyping or NC machining.
What is the overflow value?
Overflow value refers to the gap where plastic products will overflow (that is, flash). The overflow value of ABS is 0.04 mm, PC is 0.06 mm, PA is 0.0 15mm, POM is 0.04 mm, PBT+15 mm ... PBT+30%, and the overflow values of PMMA, PVC, AS, PS, PP and PE are 0.003 mm and 0.003 respectively.
What is a standard picture frame?
Commonly used drawing frames are A0, A 1, A2, A3 and A4. The dimension of A0 is1189mx841m, A 1 is: 84 1mx594mm, and A2 is.
Mold size planning?
Every company has different standards for planning mold size, but the common standards are divided as follows: 15? The mould of 30 series mould embryo is classified as small mould, 30? The dies with 50 series of die blanks are classified as medium-sized dies, and the dies with more than 50 die blanks are classified as large-sized dies.
What is elastic deformation? What is plastic deformation?
Objects will deform under the action of external forces. When the external force disappears, the deformation of the object before deformation is called elastic deformation, and when the external force disappears, the deformation of the object before deformation is called plastic deformation.
What materials are commonly used in mold embryo?
Ace steel (known as ace steel in Hong Kong) is commonly used in mold blanks, and ace steel is medium carbon steel and 45 steel.
What's the difference between CAD drawing work model space and layout space?
Model space is used for graphic entities, and layout space is used for graphic layout.
What is the function of carrying water?
The function of water delivery is to control the temperature in the mold core.
What is mold?
In industrial production, various presses and special tools installed on the presses are used to make metal or nonmetal materials into parts or products with required shapes through pressure. This special tool is collectively called the mold.
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