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xiuumin

A good Table Mould(FURNITUREMOULD) is not only reflected in the time when the product is released, but also whether the product is automatically demoulded. The qualification rate of plastic products produced by table mould is also an important indicator to determine whether table mould is excellent.

Silver streaks: During the filling and condensation process, the internal stress anisotropy affects the stress generated in the vertical direction, causing the resin to flow on the orientation, and the non-flow orientation produces a different refractive index to produce the glittering filament when it is expanded. May cause cracks in the product.

Bubbles: The water vapor and other gases in the resin are not discharged, (during the table mould condensation process) or due to insufficient filling, the condensation surface condenses too quickly to form a "vacuum bubble".

Poor surface gloss: The roughness of the mould on the table is large, and on the other hand, the condensation is too early, so that the resin cannot copy the surface of the table mould, all of which causes the surface to have a slight unevenness, which makes the product tarnish.

Seismic pattern: refers to the dense corrugation formed from the sprue center. The reason is that the melt viscosity is too large, the front end material has been condensed in the cavity, and then the material is broken through the condensation surface, and the surface is damaged.

Whitening, halo: mainly caused by dust falling into the raw material in the air or the moisture content of the raw material is too large.

White smoke, black spots: mainly due to the plastic in the barrel, due to local overheating, the barrel resin is decomposed or deteriorated.

If you need a set of reliable table mould, you can contact us, we will modify the table mould according to the different conditions reflected in the product until the production of customer satisfaction products.

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xiuumin

The Chair Mould(FURNITUREMOULD) is a large injection mould. The structure is not complicated, but it is difficult to do. The main reason is that the design and processing accuracy are relatively high. Otherwise, the product will flash burr, run the parting line and even be scrapped.

The long-term use of the chair mould cannot be separated from correct maintenance. Compared with the mould without maintenance, the properly maintained mould can obtain long service life, lower failure rate and higher product yield, which is a very effective method to reduce costs and increase benefits for injection moulding product processing enterprises. On the other hand, moulds that are often maintained can be put into production quickly by omitting the steps of testing such as trial run before use, which is also of great significance for manufacturing enterprises to save time and cost. There are so many advantages in the maintenance of the chair mould, then how to properly maintain the chair mould? Let's take a look at it together.

First of all, each chair mould should be equipped with a history card to record and count its use and damage in detail. Based on this, which parts and components have been damaged and the degree of wear can be found, so as to provide information for finding and solving problems, as well as the moulding process parameters of the chair mould and the materials used in the product, so as to shorten the test run time of the chair mould and improve the production efficiency.

Secondly, the processing enterprises should test the various performances of the chair mould under the normal operation of the injection moulding machine and the injection mould, and measure the size of the finally formed plastic part. Through this information, the existing state of the chair mould can be determined, and the damage of the cavity, core, cooling system, and parting surface can be found out. According to the information provided by the plastic part, the damage state of the chair mould and maintenance measures can be judged.

Third, several important parts of the chair mould should be tracked and tested. The function of ejection and guide parts is to ensure the opening and closing movement of the chair mould and ejection of plastic parts. If any part of the chair mould is stuck due to damage, it will lead to a shutdown. Therefore, it is necessary to check whether the ejection rod and guide pillar are deformed or damaged on the surface. Once found, they should be replaced in time. After completing a production cycle, anti-rust oil should be applied to the moving and guiding parts, and special attention should be paid to the protection of bearing parts of injection moulds with gears and racks and the elastic strength of spring injection moulds to ensure that they are always in the best working state.

Fourth, attention should be paid to the surface maintenance of injection moulds, which directly affects the surface quality of products, with the emphasis on preventing corrosion. After the injection mould completes the production task, different methods should be adopted to carefully remove residual injection according to different injection moulding. Copper rods, copper wires, and soapy water can be used to remove residual injection moulding and other deposits in the injection mould, and then air-dry.

The chair mould can obviously reduce the preparation and testing time of each link under regular maintenance and maintenance, reduce the failure rate and improve the yield. For manufacturing enterprises, the time cost and production cost of the enterprise can be greatly reduced, so that the manufacturing enterprises can obtain greater value with less time and investment.

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xiuumin

Table Mould(FURNITUREMOULD) maintenance is generally divided into primary maintenance and secondary maintenance.

The first-level maintenance of the table mould refers to the daily maintenance of the table mould by the operators during production. The main contents are cleaning, lubrication and inspection.

Maintenance during mould installation: clean the upper and lower surfaces of the table mould before mould installation. ensure that the table mould mounting surface and the press worktable are not pressed and the parallelism of the upper and lower mounting surfaces of the table mould during production. open the mould after the table mould is installed. Clean all parts of the die, especially the guiding mechanism. For the table die with surface parts, clean the surface to ensure the quality of the products. Lubricate all sliding parts of the table die. Apply grease. Inspect all parts of the table die, especially the safety parts. For example safety side pins, safety screws, side guard plates, punching waste lanes, etc.

Maintenance in production Oil the corresponding parts of the table die regularly during production. For example, press ring and fillet of drawing die; The knife-edge part of the trimming die; The flanging knife block part, etc. regularly clean up the small hole waste channel of the trimming and punching die. after the maintenance and production, the table dies should be thoroughly inspected. the table dies should be thoroughly cleaned to ensure the cleanliness of the table dies. the waste in the table die should be cleaned up to ensure that there is no waste in the waste box. the use status and the situation after use of the table die should be truthfully fed back to the die summons.

The secondary maintenance of the table mould refers to the regular and systematic maintenance of the table mould according to the technical status and complexity of the table mould. This maintenance work is completed by the mould repair personnel. Records shall be made according to the maintenance situation. The requirements and methods of secondary maintenance for different parts are described below. The male die and female die of the drawing die are the male die and the female die of the drawing die. The main problems of the female die are roughening and pressing pits on the die surface. During maintenance, the rounded corners of the table die are polished. If there is a pressing pit, repair welding shall be carried out on the table die. Then repair shall be carried out. Guide parts (guide pillar, guide sleeve, guide plate, etc.): the die will have scratches and other phenomena during operation. The causes and main causes are dirty lubricating oil and deviation of guide clearance. The scratches on the guide parts shall be eliminated by polishing after being pushed by oilstone. Trimming edge: During the use of the forming table die, the edge part is prone to chipping and edge collapse. At this time, the damaged edge of the table die shall be removed.

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xiuumin

For Chair Mould(FURNITUREMOULD) parts (such as punches and dies) that are important for quenching that are prone to deformation or cracking, effective protection measures should be taken to make the shape and section of the part symmetrical and internal stress balanced.

When the quenching heating temperature is too high, the austenite grains are rough, causing oxidation and decarburization, and the tendency of deformation and cracking of the components is increased. The quenching heating temperature is low in the prescribed heating temperature range, which causes the inner hole of the member to shrink and the pore diameter to become small. Therefore, the upper limit of the heating temperature specification should be selected; for alloy steel, if the heating temperature is too high, the inner hole will expand and the hole diameter will become large. Therefore, the lower limit of the heating temperature should be selected.

For some small stamped embossed chair mould or elongated cylindrical parts (such as small punches), it can be heated to quenching temperature in a medium temperature salt bath before preheating to 520--580 °C instead of using electric furnace directly Or the reheating of the reverberatory furnace and the deformation of the quenched portion are significantly reduced, and the tendency of cracking can be controlled. Especially for high-alloy steel chair mould parts, the correct heating method is: preheat (temperature 530--560 ° C), and then rise to quenching temperature. During the heating process, the high temperature time should be shortened as much as possible to reduce the quenching deformation and avoid small cracks.

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xiuumin

Gas is usually produced in the Chair Mould(FURNITUREMOULD), which may be related to the following points.

(1) The casting system and the air in the cavity.

(2) Some materials contain undried water which evaporates into steam at high temperatures.

(3) Due to the high temperature during the injection process, some unstable plastics will decompose and generate gas.

(4) Gases produced by volatilization or chemical reaction of certain additives in plastics.

At the same time, the cause of poor exhaust is found as soon as possible. The poor exhaust of the chair mould also causes trouble for the plastic parts. The main performance is as follows:

(1) The melt will replace the gas in the cavity during the injection process. If the gas is not discharged in time, the melt will be difficult to fill, resulting in insufficient injection volume and the cavity being unable to fill.

(2) If the gas is not free, a high pressure will be formed in the cavity, and it will penetrate into the plastic to a certain degree of compression, resulting in quality defects such as cavitation, pores, tissue sparsity and silver. food.

(3) When the gas is highly compressed, the temperature in the cavity rises sharply, causing the surrounding melt to decompose and burn, resulting in local carbonization and charring of the plastic parts. Mainly at the junction of the two melts, the gate flange.

(4) The gas cannot be smoothly removed, so the melt speed entering each cavity is different, so flow marks and fusion marks are easily formed, and the mechanical properties of the plastic member are lowered.

(5) Due to gas blockage in the cavity, the filling speed of the chair mould is lowered, the moulding cycle is affected, and the tax efficiency is lowered.

Distribution of bubbles in plastic parts

(1) The cavitation bubbles generated by the accumulation of air in the cavity are usually distributed on the portion opposite to the gate.

(2) The bubbles generated by decomposition or chemical reaction in the plastic are distributed along the thickness of the plastic portion.

(3) Bubbles generated by vaporization of residual water in the plastic material are irregularly distributed throughout the plastic part.

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xiuumin

A combination Chair Mould(FURNITUREMOULD) for compression moulding, extrusion moulding, injection moulding, blow moulding and low foam moulding, which mainly comprises a variable cavity composed of a mould combination substrate, a mould assembly and a mould combination card. The concave mould is composed of a variable core composed of a punch combination substrate, a punch assembly, a punch combination card, a cavity cutting assembly and a side cutting combination plate.

The chair mould has a coordinated change in convex, concave and auxiliary forming systems. It can process a range of plastic parts in different shapes and sizes.

The tools and products we use in everyday production and life range from the bottom of the machine to the machine casing, to the screws, buttons and casings of various household appliances, all of which are closely related to the chair mould.

The shape of the chair mould determines the shape of these products, and the quality and precision of the chair moulds determine the quality of these products. Due to the different materials, appearance, specifications and uses of various products, the moulds are divided into moulds, forging dies, die-casting dies, stamping dies and other non-plastic moulds, as well as plastic moulds.

In recent years, with the rapid development of the plastics industry and the continuous improvement of the strength and precision of general and engineering plastics, the application range of plastic products is also expanding, such as: household appliances, instrumentation, construction equipment, automotive industry. In many areas, such as everyday hardware, the proportion of plastic products is rapidly increasing. Well-designed plastic parts can often replace many traditional metal parts.

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