Ask the master to help design a plastic part with side core pulls and molds

A demoulding mechanism with a side core-pulling extrusion die is an ejection mechanism that changes the product on the basis of the original device; remove the elongated plate and the beating rod of the push rod plate in the prior art, and arrange a hydraulic cylinder on the fixed plate above the die, this hydraulic cylinder passes through the press workbench plate, is placed on the top of the die, and the piston rod of the hydraulic cylinder is connected with the push rod plate of the die, so that the push rod is not linked with the press workbench plate, but is controlled by the hydraulic cylinder that is arranged alone. The present invention is used for the demoulding of extrusion die, solves the problem that the product demoulding difficulty occurs in the die-casting mode of adopting gate in the product center and feeding material from below, provides possibility for realizing continuous production and program control, compared with the prior art, its ejector rod plate will not be deformed, and the core-pulling die on the installation side is smooth, without obstruction, and the structure is simple, and the control is convenient; It is also suitable for the demolding of core-pulling dies without sides.

The design of the core-pulling mechanism on the side of the plastic mold (YC) is professional only to make a good mold.

Through the introduction of the previous knowledge of plastic mold structure, parting surface design, gating system design, etc., you may have a certain understanding of the knowledge of plastic mold design.

Plastic mold in general only the front mold, the back mold, this is also a simpler mold, when the side of the plastic product has the characteristics of convexity, concave, only the front and rear mold is unable to open the mold normally, and can not be ejected by the commonly used ejection method, in the product side of the protrusion, recess, words and various symbols and other characteristics are called inverted, such a product structure must be out of the slider, inclined top and other side core-pulling mechanism, in addition to the material soft and elastic plastic can be forced to demould. The commonly used side core-pulling mechanism is divided into two forms: internal and external pumping, that is, our common inclined top, slider, oil cylinder, rotary motor, etc.

1) Inclined top, mainly used in the small undercut position on the product, with the ejection of the product, along a certain angle of the inclined top at the same time to move, out of the product of the inverted buckle, to achieve demoulding.

2) Slider, when the structure of the plastic product is not suitable for the inclined roof, the slider should be used. When the mold is opened, the inclined guide pillar is separated from the front mold and the rear mold, and the slider is pulled outward under the drive of the inclined guide pillar, and slowly detached from the inverted buckle of the product. By changing the inclined guide pillar of the slider, the side core-pulling structure is changed to the pull-out side-pulling slider, the spring side-pulling slider and the front die side-pulling slider and so on.

3) Cylinder side core pulling, when the plastic product has a long inverted length and cannot be pulled with an inclined guide pillar, it is not suitable to use the slider side pull.

4) Hydraulic motor, when there is an undercut of the internal thread on the product, when the mold is removed, with the rotation of the motor, the undercut at the thread is constantly withdrawn, so as to realize the detachment of the undercut at the product.

The above are some common ways of the core-pulling structure on the side of the plastic mold.

200 yuan can also help you.

Divide? Not interested. Some questions are still okay when you are bored.

But you are really stingy when you let others help you do things, which one does mold design, and you don't take one or two hundred yuan from the boss after designing a set of molds? And only more. You should ask everyone how many sets of molds you have designed in a month and how much salary you get.

I want people to do things for free.

Do you want to send us the 3D drawings or drawings directly? Let everyone design it for you and send it back. I want to be the boss and not have to pay my employees. How nice. You also have to pay tuition fees for your studies.

Brother, this is quite time-consuming, okay.

200 points want someone else to design a set of molds for you... I'm embarrassed to death...

Side cores are required when the part has holes or convex concaves in a direction different from the direction of demoulding.

Any mechanism that can obtain lateral core-pulling or lateral parting and resetting action to get out of the position of the product inverted, low and other positions is called a row mechanism. Using the mold opening action of molding, the diagonal brace tip and the slider produce a relative movement trend, so that the slider is separated from the barb in two motion forms along the mold opening direction and the horizontal direction.

Classification: 1) Manual lateral parting core-pulling mechanism.

This kind of mechanism is to manually remove the side core and the plastic part from the mold after the mold is opened, and the side core is pulled out outside the mold, or the movable core is taken out by manual or hand tools before the mold is opened. The mold structure corresponding to this kind of mechanism is simple, the cost is low, but the production efficiency is low, the labor intensity is large, and it is limited by manpower, so it is only used in special occasions, such as trial production of new products, small batch production of small plastic parts, etc.

2) Hydraulic or pneumatic lateral parting core-pulling mechanism.

This kind of mechanism relies on the power provided by the hydraulic system or pneumatic system, and is equipped with special hydraulic cylinders and cylinders on the mold, and carries out lateral parting, core pulling and reset through the reciprocating motion of the piston. This type of mechanism is characterized by large shaft pulling force, flexible action, not limited by the mold opening process, and stable movement. The new injection molding machine itself comes with this device, which is very convenient to use.

However, at present, the general injection molding machine is not equipped with such a device, and needs to be equipped with pneumatic or hydraulic components, and the cost is high, so the application is limited to a certain extent. It is often used in large injection molds.

3) Motorized lateral parting core-pulling mechanism.

This kind of mechanism uses the mold opening motion of the injection molding machine, and after changing the direction of its movement, the mold is side-parted or the side core is extracted from the plastic part. This kind of mechanism has the advantages of easy operation, high production efficiency, easy to realize automatic production, etc., although its mold structure is more complex, but it is still a kind of lateral parting core-pulling mechanism that is widely used in production.

Injection molds are generally equipped with guides. There are three main functions of the guide device, one of which is the guiding effect, that is, when the moving mold is clamped with the fixed mold, the guide device is guided first, and the core closes the cavity and then closes the mold, so that the core and the cavity collide and be damaged, and the second is the positioning effect, because the guide device has a higher guiding accuracy, and at the same time, the guide device can withstand a certain lateral pressure, because the shape of the cavity of the injection mold is not necessarily symmetrical, so the force of the plastic in the cavity is not the same as that of the molten plastic on the wall, In this case, the guide can withstand a certain amount of side pressure.

The three guide pillars and guide sleeves should be at sufficient distance from the edge of the template to ensure the strength of the template. The material of the guide pillar and guide sleeve is best quenched with 20 steel surface residual carbon, so that the surface hardness is high, wear-resistant, and the two cores are soft and tough.

Core-pulling structure. The mold adopts the design form of 1 mold and 2 pieces. At the same time, the 26x48mm cavity hole must be core-pulled.

In order to make the overall structure design of the mold compact and reasonable, an integral oblique slider was designed. The core pulling is fixed under the same inclined slide block, and the inclined guide pillar is used to pull the core. After full consideration of various process parameters, the angle of the inclined guide pillar was finally determined to be 22 degrees.

It can not only achieve the purpose of core pulling, but also ensure that the overall structure of the mold is reasonable.

1. If the slider of the side core pulling is relatively small, take the waterway on the mold kernel. If the product is large, go through two layers, and if the product is small, it is enough to walk through one layer. If the product is relatively deep, make a water well to ensure that the mold has enough cooling.

2. If the slider of the side core pulling is large enough, take the waterway directly on the slider, and pay attention to avoid the oblique guide pillar on the slider. This will be more beneficial for the cooling of the slider area. If you are on the mold, you can take the waterway according to the conventional method.

Let's make a three-plate mold with ug.。。。 Straight-through waterways or wrap-around ones are OK... It's just that the mold structure is a little too compact...

You can consider the oblique guide pillar to be thickened, if it is an oblique guide pillar, you can consider taking two waterways from the slider, one in and one out, and it is not easy to walk on both sides. . . There are small tie rods... It's not fun to hit the wrong hole when drilling...

Hope it helps.