The Lava Pompey Worm finished reading the information about the casts that the Zerg brood had sent them with the brainstorming that was gradually recovering.

Liu Kui was puzzled: "Can these huge super bugs read?" Castings or something? ”

The Zerg Brood nodded confidently.

The Zerg Hive then searched her brain for some sword casting molds, including video advance demonstration renderings.

The Zerg Hive used brainstorming to play out the searched brainstorming sound slides, and the following image appeared in the minds of each lava Pompe worm:

A brother first put half of the plastic mold of the knife under the wooden box, sprinkled with soil to a certain amount, pressed a few times with his fist on the soil, and then used a flat wood to carry out repeated beating, repeated several such actions, and then the wooden box covered with sand, took out the hammer and then hammered hard, after several times to determine the compaction, scraped the excess soil on the wooden box and covered it with a lid, sealed it tightly and turned it over.

Open the lid on the flip side. We saw that the side with the plastic knife mold was exposed, and the little brother took out a brush at this time, swept the excess sand on the plastic mold, dripped glue to glue the other half of the plastic knife mold together, and used the same method to fill this side with soil and compact, after completing these.

The little brother stood up the two combination wooden boxes, unscrewed the screws and opened the boxes on both sides, we saw that the outline of the knife could already be seen in the soil, the little brother carefully took out the plastic knife, and injected the molten iron that had just been smelted in advance into the small hole that was opened, and after a while to cool and opened, the basic knife model came out, but it was not the final finished product, and then after several complex processes such as polishing and polishing of the machine, a sword was perfectly cast. This is the legendary sand forge sword model. The sword mold made by this method is not afraid of ultra-high temperature ice crystal water burning the sword mold when pouring.

At the same time, the Zerg brood used brainstorming to search her brain for a variety of methods related to casting patterns, such as:

Injection molding: The plastic is first added to the heated barrel of the injection machine, the plastic is heated and melted, and under the impetus of the screw or plunger of the injection machine, it enters the mold cavity through the nozzle and the mold pouring system, and hardens and sets into injection molded products due to physical and chemical effects. Injection molding is characterized by a cycle of injection, packing (cooling) and part demolding.

Thermoplastic injection molding has a short molding cycle, high production efficiency, low wear and tear of the melt to the mold, and can form plastic parts with complex shapes, clear surface patterns and marks, and high dimensional accuracy in large quantities; However, for plastic parts with large variations in wall thickness, it is difficult to avoid molding defects. The anisotropy of plastic parts is also one of the quality problems, and all possible measures should be used to minimize it.

Compression molding: commonly known as compression molding, is one of the earliest methods of molding plastic parts. Compression molding is to add plastic directly into an open mold cavity with a certain temperature, and then close the mold, and the plastic melts into a flowing state under the action of heat and pressure. Due to physical and chemical reactions, the plastic hardens into a plastic part with a certain shape and size that remains unchanged at room temperature.

Compression molding is mainly used to form thermosetting plastics, such as phenolic molding powder, urea-formaldehyde and melamine formaldehyde molding powder, glass fiber reinforced phenolic plastics, epoxy resins, resins, silicone resins, polyimide and other molding compounds, and can also mold and process unsaturated polyester pellets, sheet molding compounds, prefabricated monolithic molding compounds, etc. Under normal circumstances, the compression die is often divided into three categories: overflow type, non-overflow type and semi-overflow type according to the matching structure of the upper and lower molds of the compression film.

Extrusion molding: It is a molding method that makes the plastic in the state of viscous flow pass through a die with a specific cross-sectional shape at a high temperature and a certain pressure, and then shape it into a continuous profile with the desired cross-sectional shape at a lower temperature. The production process of extrusion molding is the preparation of molding materials, extrusion molding, cooling and shaping, traction and cutting, and post-processing (quenching and tempering or heat treatment) of extrusion products.

In the process of extrusion molding, pay attention to adjust the temperature, screw speed, traction speed and other process parameters of each heating section of the extruder barrel and the head die in order to obtain qualified extrusion profiles. Particular attention should be paid to adjusting the rate at which the polymer melt is extruded from the nose die.

Because when the rate of extrusion of the melt is low, the extrudate has a smooth surface and a uniform cross-sectional shape; However, when the extrusion rate of molten material reaches a certain limit, the surface of the extrusion will become rough and tarnished, and shark skin, orange peel lines, and distorted shapes will appear.

When the extrusion rate is further increased, the surface of the extrusion is distorted and even fragmented and fractured into melt fragments or cylinders. Therefore, the control of the extrusion rate is crucial.

Injection molding: also known as casting molding. It is to add the plastic raw materials into the preheated feeding chamber, and then put the pressure column into the feeding chamber to lock the mold, and apply pressure to the plastic through the pressure column, and the plastic melts into a flow state under high temperature and high pressure, and enters the cavity through the gating system to gradually solidify into plastic parts. This molding method is also known as transfer molding. Pressure injection molding is suitable for plastics that are lower than solid plastics, and in principle, compression molding can be used, and pressure injection molding can also be used. However, it is required that the molding material has good fluidity in the molten state when it is lower than the curing temperature, and has a larger curing rate when it is higher than the curing temperature.

Hollow molding: It is a processing method that fixes the tubular or sheet blank that is still in the plasticized state prepared by extrusion or injection in the molding mold, and immediately introduces compressed air to force the blank to expand and stick to the wall of the mold cavity, and is demoulded after cooling and setting, that is, a processing method for obtaining the required hollow product.

The plastics suitable for blow molding are high-pressure polyethylene, low-pressure polyethylene, hard polyvinyl chloride, soft polyvinyl chloride, polystyrene, polypropylene, polycarbonate, etc. According to the different methods of parison molding, hollow molding is mainly divided into two types: extrusion blow molding and injection blow molding.

The advantage of extrusion blow molding is that the structure of the extruder and the extrusion blow molding mold is simple, and the disadvantage is that the wall thickness of the parison is inconsistent, which is easy to cause the uneven wall thickness of plastic products. The advantage of injection blow molding is that the wall thickness of the parison is uniform, no flash, because the injection parison has a bottom surface, so the bottom of the hollow product will not produce splicing and seams, which is not only beautiful but also has high strength.

The disadvantage is that the molding equipment and molds used are expensive, so this molding method is mostly used in the mass production of small hollow products, and it is not as extensive as the extrusion blow molding hollow molding method in use.

Die-casting mold: Die-casting mold is also known as transfer molding. The plastic raw material is added to the preheated feeding chamber, and then pressure is applied to the pressure column, the plastic is melted at high temperature and high pressure, and enters the cavity through the pouring system of the mold, and gradually hardens and molds, this molding method is called die casting molding, and the mold used is called die casting molding mold. This kind of mold is mostly used for the molding of thermosetting plastics. In addition, there are foam plastic molding molds, glass fiber reinforced plastic low-pressure molding molds and so on.