What are the basic knowledge commonly used in mold design-Mold design knowledge

What are the basic knowledge commonly used in mold design - mold design knowledge

Does everyone know about mold knowledge? Do you know what are the basic knowledge commonly used in mold design? Below, I will share it with you Commonly used basic knowledge in mold design, come and see how many you know!

What forms of runners are there?

There are circular runners ? Semicircular flow channel? T-shaped flow channel? Regular hexagonal flow channel.

What are the common manuals and books for mold designers?

Steel books, plastic books, and mold standard parts books.

What is the function of spring?

It produces rebound force when it is used externally.

Why does the mold need to be drafted?

Prevent product demoulding. was injured.

What is the function of screws and how to determine the matching length?

It mainly plays a role in tightening and fixing. The matching length is generally 1.5 to 2 times the diameter of the screw.

Commonly used plastic engineering materials and shrinkage rates?

ABS: 0.5 (super unbreakable glue)

pc: 0.5 (bulletproof glass glue)

PMMa: 0.5: (plexiglass)

pe: 2 polyethylene

PS: 0.5 (polystyrene)

pp: 2( 100% soft rubber)

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

What are the mold classifications? Large system?

Pouring? Ejection? Cooling? Forming? Exhaust

What issues should be paid attention to during the mold design process?

1. Wall thickness It should be as uniform as possible, and the draft should be large enough.

2. The transition part should be gradual and smooth, avoiding sharp corners.

3. Gate. The flow channel should be as wide and short as possible, and the gate position should be set according to the shrinkage and condensation process. If necessary, a cold well should be added.

4. The mold surface should be smooth and clean, with low roughness (preferably less than 0.8)

5. The exhaust holes and grooves must be sufficient to discharge air and gas in the melt in a timely manner. .

6. Except for PET, the wall thickness should not be too thin, generally not less than 1mm.

What are the common defects in plastic parts?

Lack of glue? Cloak ?Bubbles?Shrinkage?Weld marks?Black spots?Stripes?Lifting?Delamination?Peeling

Commonly used plastic mold steel?

　45# S50c 718 738 718H

738H P20 2316 8407 H13

NAK80 NAK55 S136 S136H SKD61

Which material is used for high mirror polishing?

Commonly used high-hard heat-treated steels, such as : SKD61, 8407, S136

What is 2D, what is 3D?

The English word D is: the prefix of Dimension (line, dimension), 2D refers to the two-dimensional plane , 3D refers to the three-dimensional space. In the mold part, 2D usually refers to the plan view or CAD drawing, and 3D usually refers to the three-dimensional drawing.

What is the default precision of pro/e? What is the default precision of UG?

The default precision of pro/e is: 0.0012MM, and the default precision of UG is: 0.0254MM.

Top four mold base manufacturers in the world?

Germany: HASCO Japan: FUTABA (Double Leaf) United States: DME China: LKM (Longji)

CAD What is the default font height?

The default CAD font height is: 2.5MM.

What is penetration and what is penetration?

The bonding surface of the male and female molds that is parallel to the PL surface is called the penetration surface, and the mating surface of the male and female molds that is not parallel to the PL surface is called the penetration surface. The jointed noodles are called inserted noodles.

The relationship between strips and threads

Strips and threads are both units of length. Strip is a Taiwanese term, 1 strip = 0.01MM, silk is a Hong Kong term, 1 thread = 0.01MM, so 1 strip = 1 thread.

What is the pillow position?

There are often gaps on the edge of the shell plastic parts, which are used to install various accessories. The strong parting part of the pillow formed here is called the pillow position. .

What structures does the mold base have?

Panel? A plate? B plate? Square iron? Guide post? Ejector plate? Ejector fixing plate? Bottom plate

What are the basic forms of profiles?

Straight? Inclined? Curved surface? Vertical? Arc 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? Grinding machine? Drilling machine

What is the crater?

The shape of the glue-reduced part at the root of the BOOS column reflected on the mold after the volcanic eruption is called the mold crater.

What is "He"?

"He" refers to Mo Ren, a Hong Kong idiom.

What is the tiger's mouth?

The tiger's mouth is also called: tube position, which is the part used to limit the position.

What is ranking?

The product layout on the mold is called ranking.

What is the glue level?

The cavity of the product on the mold is called: glue level.

What is the bone position?

The tendons on the product are called: bone position

What is the column position?

The BOSS column is called: column position.

What is a virtual position?

The gap on the mold is called: a virtual position.

What is a buckle?

The hook used to connect the product is called a buckle.

What are spark marks?

The marks left after EDM are called spark marks.

What is the PL surface?

The PL surface is also called: parting surface and pop-up surface, which refers to the part where the front mold and the rear mold come into contact when the mold is closed.

What is a computer gong?

CNC milling machine and machining center

What is a copper worker?

EDM usually uses a machine that is easy to process Copper materials are used as discharge electrodes, which are called copper workers, also called electrodes. Copper workers are generally divided into: rough workers, rough workers, young workers, and young workers, also known as fine workers.

What is the spark position usually?

During the discharge process, the discharge gap between the copper and steel materials is called the spark position. The sparks for rough work are generally 10 to 50, and for rough work, there are generally 10 to 50 sparks. The spark bits are generally between 5 and 15.

What is the material level?

The thickness of plastic products is also called the thickness.

What is the original body?

The original body is relative to the cutting insert. The original body refers to a whole piece of steel as a blank for processing, which is processed together Process it out.

What is a weld mark?

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

What is jet flow?

After the plastic enters the mold cavity from the plastic inlet, it forms a curved and folded snake-like flow mark called a jet flow.

What does LKM refer to?

LKM refers to Longji mold base. Commonly used mold bases are: LKM, Fudeba, Mingli, Huansheng, Changhui and Desheng.

What does DME mean, and what does HASCO mean?

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

What is an undercut?

The parts of the product that cannot be directly demolded from the front and rear molds become undercuts.

What is foolproofing.

Fool-proofing is an idiom, which is to prevent a very simple mistake and to prevent being in a daze! For example: an insert has hangers of the same size on both the sky and the ground. It is very difficult to assemble on site. It is possible to install the sky and the earth upside down, but he makes a hanging stand on one side of the insert. At this time, if the sky and the earth are installed upside down, it will not fit in. It is impossible to install it incorrectly. This prevents errors caused by being in a daze. Movement becomes daze.

What is a beer machine?

Beer machine is a local idiom, which is what we often call injection molding machines and molding machines.

What is a stop-kou?

A stop-kou is the art line of the mouth, also known as the ugly line.

What is a flying mold?

A flying mold is a matching mold or a standard mold.

What is a light knife?

The CNC finishing action is called a light knife, which means machining in place based on rough cutting.

What is frame opening?

The action of processing the position of the mold core on the mold base is called frame opening.

What is font printing?

Script fonts are processed fonts that are placed on the film and then added with fonts.

What is reverse lamination?

The method of opening the mold by inverting the front and rear mold material positions under normal circumstances is called reverse lamination.

What is Fuhe?

The mold ejection method of using small inserts to pop up the local undercut is called Fuhe.

What is front mold eating?

When the mold is opened, the product remains in the front mold, which is called front mold eating.

What is ejection white?

When ejecting, the mold force required is large, and the ejection pin is not strong enough, causing the product to be partially ejected. From the front of the product, there is an obvious white color. Dingbai is also called Dinggao Shuikou.

What is baking.

The mark left on the surface of the point when diving is called a baking mark.

What is a coder?

A coder is a clamping tool, a pad with a triangular bevel opening slot.

What is overcutting?

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

What is the school cup?

The front mold pops up and opens the mold.

What is a thread?

Tapping. Tapping a thread is called a thread.

When is it necessary to make a two-color mold?

When a product contains two different materials or the same material in different colors, a two-color mold is designed.

What is the mold design process in the factory?

The customer provides product drawings, analyzes the product, confirms the plastic type, confirms the mold material, transfers the engineering drawing, multiplies and shrinks to make a mirror, and completes the assembly. Elevation drawing? Ordering mold base? Ordering mold core material? Drafting? 3D mold splitting? Determining runner/gate method? Referring to the layout diagram for structural design? Disassembling inserts? Correcting 3D? Engineering drawings including: mold core /Inserts/Mold bases/Parts》? Make BOM list? Proofread and review

How many ways are there to demould?

Smooth removal and forced removal

What are the glue feeding methods?

Direct glue feeding? Overlap glue feeding? Side glue feeding? Circular glue feeding? Sheet glue feeding? Latent type? Point glue feeding? Horn type glue feeding? Fan-shaped glue feeding.

What is the general slope of the slider, and what is the slope of the inclined guide column?

What is the general slope of the slider: 20 degrees, and the slope of the inclined guide column? Generally, it is 18 degrees.

What is the function of the cold slug well?

The function of the cold slug well is to store the small portion of relatively low-temperature plastic material that enters the mold first.

What is the function of the positioning ring?

The function of the positioning ring is to ensure that the correct relative position between the mold and the injection machine is maintained.

Relative positions of fits?

Fits are mainly divided into three categories: clearance fit, transition fit, and interference fit.

What is the function of inserts?

It facilitates processing, prevents carbon deposition, facilitates polishing, saves materials, helps exhaust, facilitates replacement, and reduces the size of the processing machine.

What are the hardness indicators?

Hardness indicates the ability of a material to resist hard objects being pressed into its surface. Commonly used hardness indicators include Brinell hardness, Rockwell hardness and Vickers hardness. hardness.

Can the surface be drafted? Can the group be drafted? Can the quilt be replaced?

The surface cannot be drafted, the grouped surface can be drafted, and the quilt can be replaced.

What is the difference between the first angle method and the third angle method?

① When an object is placed in the first quadrant, {viewpoint} (observer)? (object)? The method of drawing the projected view based on the (projection plane) relationship is called the first angle method, also known as the first quadrant method.

② Any drawing method that places an object in the third quadrant and projects the view based on the relationship of {viewpoint} (observer)? (projection surface)? (object) is called the third angle method. , also known as the third quadrant method.

Note: The difference between the first-angle painting method and the third-angle painting method is the view placement of the article.

How to draw the first corner: put the left view on the right, the right view on the left, the top view on the bottom, and so on?

How to draw the third corner: put the left view on the left, right Place the view on the right, place the top view on the top, and so on?

What are the ways to transport water?

Commonly used water transports include: straight-through type, wrap-around type, and water tower type. , spiral.

What are the basic principles of three views?

The basic principles of three views are: length aligned, height aligned, and width equal.

What types of injection machines are divided into?

According to the appearance, they are divided into vertical type and horizontal type. "These two most commonly used types" are divided into: according to the injection volume: Ultra-small injection molding machine, small injection molding machine, medium-sized injection molding machine, large injection molding machine, extra-large injection molding machine. That is to say, the injection volume ranges from a few milligrams to tens of kilograms, and according to the mold clamping force, it ranges from a few tons to several thousand tons.

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

The clamping force of the injection molding machine must be greater than the mold supporting force, otherwise the mold will be opened by the pressure inside the mold.

What are the positioning methods of the male and female molds?

There are two types of positioning methods for the front and rear molds: one is: template positioning, and the other is: mold core positioning.

What is the suitable wall thickness of commonly used plastics?

The suitable wall thickness of ABS is: 1.8?3mm, the suitable wall thickness of PC is: 2?3.5mm, the suitable wall thickness of POM Thickness: 1.5~2.5mm, suitable wall thickness for NoryL: 2~3.5mm

Classification of molds?

Molds can generally be divided into plastic molds and non-plastic molds. Plastic molds include: casting molds, forging molds, stamping molds, die-casting molds, and plastic molds. According to different production processes and products, they are divided into: injection molding molds, blowing molds, compression molding molds, transfer molding molds, and extrusion molding molds. , thermoforming molds, rotational molding molds, molds can be divided into three categories according to the different types of gating systems: large nozzle molds, thin nozzle molds, and hot runner molds.

What is a gating system?

The plastic flow channel from the injection machine nozzle to the cavity is called the gating system. The gating system includes: main channel, runner, gate and cold material well.

What is reverse engineering?

Reverse engineering is a high-speed three-dimensional laser scanning machine that accurately and quickly scans existing samples or models to obtain its three-dimensional contour data and coordinate with the reaction. The software performs curve reconstruction, conducts online precision analysis of the reconstructed surface, evaluates the structural effect, and finally generates IGES or STL data, which can be used for rapid prototyping or CNC machining.

What is the overflow value?

The overflow value refers to the gap under which the plastic product will overflow (that is, the burr runs). The overflow value of ABS The edge value is: 0.04mm, the overflow value of pc is: 0.06mm, the overflow value of pA is: 0.015mm, the suitable wall thickness of POM is: 0.04mm, the overflow value of PBT 15GR is: 0.03mm, PBT 30 The overflow value of PMMA is: 0.065mm, the overflow value of PVC is: 0.07mm, the overflow value of AS is: 0.05mm, the overflow value of ps is: 0.05mm, the overflow value of pp is: The overflow value is: 0.03mm, and the overflow value of PE is: 0.02mm.

How big is the standard frame?

Commonly used frames are: A0, A1, A2 , A3, A4, A0 frame size is: 1189mx841m, A1 frame size is: 841mx594mm, A2 frame size is: 594mmx420mm, A3 frame size is: 420mmx297mm, A4 frame size The size is: 297mmx210mm

Mold size planning?

Each company has different standards for planning mold size, but the common standards are as follows: 15 to 30 series mold bases Molds with a mold base of 30 to 50 are classified as medium molds, and molds with a mold base of 50 or above are classified as large molds.

What is elastic deformation? What is plastic deformation?

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

What material is commonly used for mold bases?

Ace steel (called in Hong Kong) is commonly used for mold bases. Ace steel is medium carbon steel and 45 steel.

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

Model space is a space for graphic entities, and layout space is a space for drawing layout.

What is the function of water transport?

The function of water transport is to control the temperature of the mold core.

What is a mold?

In industrial production, various presses and special tools mounted on the press are used to make metal or non-metallic materials into the required shape through pressure. Parts or products, this special tool is collectively called a mold. ;