Plastic Injection Mold Assembly Process Cnmoulding® (China)

Trump to impose a tariff of 45% on China! What is the impact?

The Trump team is releasing news that the new US president may honor his campaign pledge to include China as a currency manipulator,But may not fulfill another promise: the Federal Reserve Chairman Janet Yelen pull down.

In a Bloomberg TV interview Friday, Trump's economic adviser Judy Shelton replied, "When he was asked whether Trump would really include China as a currency manipulator, he said, "He said, and Trump argued against currency manipulation by trade opponents.

Shelton also said that the Fed will remain independent in the future, he could not imagine why Yellen will not complete the current term. However, he revealed Trump's low interest rate on the Fed to maintain dissatisfaction, said Trump does not support the establishment of a low interest rate based on the "false economy."

Trump economic adviser Judy Shelton on Friday hinted that China will determine the exchange rate of the country, he also said Trump is a "say to do" people. Trump has pledged to declare China the currency manipulator on the first day of his presidency, threatening to impose a high tariff of 45% on Chinese imports. Once it is determined that there is exchange rate manipulation in a country, the United States will not only exert pressure on the government to adjust its exchange rate policy through the IMF, it is more likely to retaliate by means of trade. Trump after the election may exacerbate the outflow of capital in China, thereby increasing the pressure on the RMB depreciation in the medium term. 45% of the tariff!! At this time a lot of partners to panic. However, a careful analysis, even though the United States is China's largest export target, but China is actually on the US trade exposure is shrinking, according to Morgan Stanley estimates, even with 45% punitive tariffs, China's total exports Will only drop 13%. The United States accounted for 17 percent of China's total exports, up from 21 percent five years ago, but contributed 43 percent of China's trade surplus.

In the first nine months of 2016, China's exports to the United States were in the form of telecommunications equipment ($ 56 billion), office facilities ($ 47 billion), electronics ($ 33 ​​billion), clothing ($ 24 billion) ($ 16 billion). China's exports to the United States accounted for 39% of furniture exports, followed by metal ores and scrap metal (33%), footwear (33%), telecommunications and recording equipment (29%), Handbags (26%).

www.chinamoldmaker.org 

If the United States to raise tariffs on China Chinese exporters because of their profits are not high (5%), so the ability to absorb US tariffs to improve the impact of limited capacity. The increase in tariffs will be fully spread to the prices of Chinese exports. Suppose that US tariffs on China increased from the current 2.8% to 15%, 30% and 45% (see the Republican March debate: edition.cnn.com/2016/03/10/politics/republican-debate-tran-full China's exports to the United States will be more hit, will decline 21%, 46%, 72%; However, China's total exports in the medium term corresponding to the decline in the rate of much smaller, respectively, 4% 8%, 13%.

The United States a substantial increase in tariffs may not occur immediately Trump government to raise tariffs on the matter before the first communication with the domestic and foreign, Congress passed, but also through the domestic long judicial review. In addition, WTO is a series of mechanisms to resolve trade disputes, the United States as a WTO member should give priority to choose WTO to resolve trade disputes. So the United States is unlikely to really in the short term to China to implement a more tightening of trade policy. But if China's export growth falls drastically, a fall in trade surpluses will deter yuan demand, which could accelerate the devaluation of the renminbi, especially in the face of speculative sentiment and the effects of cross-infection. Of the bad big.

Injection mold principle

Plastic injection mold is given to the shape and size of the molding member. Although the structure of the mold and performance of varieties of plastic, shape, and configuration and the type of plastics injection molding machine may be different and changing, but the basic structure is the same. Die mainly by gating system, molded parts and structural parts of three parts. Gating system and molded parts which are in direct contact with the plastic part, and with the plastics and products change, the mold is the most complex and the biggest change, the most demanding part of the process finish and accuracy.

Gating system refers to the plastic from the nozzle portion of the cavity before entering the flow path, including the main channel, cold-slug, diversion channel and the gate and so on. Forming part refers to the shape of the various parts constituting products, including dynamic simulation, the fixed mold and cavity, core,  air popper forming rod and exhaust ports and so on. 

Sprue

   

  It is mold injection machine nozzle connected to a shunt or cavity section channel. Sprue concave top to the nozzle convergence. Sprue inlet diameter should be slightly larger than the diameter of the nozzle (O.8mm) to avoid overflow and prevent the interception of convergence between the two are not allowed to occur due. Imported products according to the size of the diameter, usually 4-8mm. Expanding the diameter of the main channel at an angle of 3 ° to 5 ° should be within in order to release the flow channel thereof is superfluous.

Cold slug

    

It is located in the main channel at the end of a hole to trap shoot between the ends of two injections of mouth generated by cold material, thereby preventing the diversion channel or gate blocked. If cold material once mixed with the cavity, then the system is easy to produce products in the internal stress. Cold slug diameter of about eight a lOmm, depth of 6mm. In order to facilitate mold release, normally borne by the bottom of the release lever. Top release lever should be designed to zigzag trench subsidence hook or set up in order to successfully pull the sprue superfluous matter when stripping.

Shunt

It is a multi-slot die cavity connecting the main channel and each channel. In order to melt each cavity is filled with equal speed, diversion channel on the mold arrangement should be symmetrical and equidistant distribution. Runner-sectional shape and size of the plastic melt flow, and ease of mold release products has an impact. If the feeding amount in equal flow, it places the smallest cross-section of the flow path resistance. But because of the cylindrical flow channel surface area is small, the cooling of the shunt superfluous material adverse, and this shunt must be opened on the two halves of the mold, both labor-and easy alignment. Therefore, regular use of the trapezoidal or semi-circular cross-section of the runner, and the opening on one half of the mold with a release lever. Channel surface polished to reduce flow resistance must provide faster filling speeds. Depends on the size of the plastic flow channel variety, size and thickness of the article. For most thermoplastics, the shunt section width does not exceed 8m, up to 10 a large 12m, special small 2-3m. Under the premise of meeting the needs of the cross-sectional area should be minimized to avoid increasing the shunt Warts and extend the cooling time.

Gate

It is on the main road (or shunt) and the cavity of the channel. Sectional area of ​​the channel can be with the mainstream channel (or shunt) are equal, but are usually reduced. So it is the smallest part of the whole system, the cross-sectional area of ​​the flow path. The shape and size of the gate great impact on product quality. The role of the gate is: A, control the material flow velocity: B, due to the injection can be stored in this part of the condensate and prevent melt back earlier: C, so that the melt by strong shear by increasing the temperature , thereby reducing the apparent viscosity to increase flowability: D, easy separation of products, and the flow channel system. Gate design shape, size and position depend on the nature, size and structure of the article of plastics. The gate of the cross-sectional shape is generally rectangular or circular cross-sectional area should be small and the length should be short, not only based on the above effects, but also because larger than the small gate easy, and it is very difficult to reduce the large gate. Gate location should generally be selected in the products do not affect the appearance of the thick places. Gate size should be designed to take into account the nature of the plastic melt.

Cavity

It is the mold space molded plastic products. Component as constituting the cavity collectively referred to as molded parts. Various molded parts are often specific names. The molded article constituting the shape of the concave part called a die (also known as the female mold) to form the internal shape of the article (such as holes, slots, etc.) is referred to as core or convex mold (also known as the male mold). First, the overall structure of the cavity to be determined according to performance, the geometry of products, dimensional tolerances and use requirements designed plastic molded part time. Second, to select sub-surface, the gate and the vent mode position, and release according to the determined structure. Finally, press the control product dimensions of each part of the design and determine the combinations between the various components. Plastic melt with high pressure into the cavity, so the molded parts to be reasonable selection and check the strength and stiffness. To ensure the smooth plastic surface appearance and easy stripping, where contact with the plastic surface roughness Ra> 0.32um, but also resistant to corrosion. Molded parts are generally by heat treatment to improve the hardness and corrosion-resistant steel manufacturing.

Vent

A groove which is open in a mold outlet, and for discharging the original gas into the melt. When the molten material into the cavity, the original is stored in the cavity from the melt into the air and gas must be discharged through the exhaust port to die at the end of the stream outside, otherwise it will make products with holes, bad splices, filling dissatisfaction, even accumulated compressed air due to high temperature and the product burns. In general, both exhaust holes provided in the cavity of the melt flow at the end, may be provided on the mold parting surface. The latter was set up at the side of the die deep 0.03-0.2mm, wide shallow groove 1.5-6mm's. Injection, the vent does not have a lot of melt leakage, because the melt is cooled and solidified in where the channel blocked. Never open position toward the exhaust port operator, to prevent accidental discharge wounding melt. It will also use the top of the bar with the gap with the top of the hole, the top block and the stripper plate and with the gap cores like exhaust.

Structural parts

  

  It refers to the various parts constituting the mold structure, including: orientation, ejection, core pulling and genotyping of various parts. As the front and rear plates, after deduction templates, pressure plate, bearing columns, guide posts, stripper, stripping pole and the return pole and so on.

Heating or cooling means

   

  This is to make the melt solidified in the mold shape of the device for thermoplastic male and female mold is typically a cooling medium passage, and by circulating cooling medium to the cooling purposes. Pass into the cooling medium and the structure of an article with the type of plastic and the like, cold water, hot water, hot oil and steam. The key is uniform cooling high efficiency, uneven cooling products will directly affect the quality and size. Should be based on the thermal properties of the melt (including crystallization), the shape of the article and the mold structure, consider selecting the arrangement of the cooling passage and the cooling medium.

There is a obvious distinction between Die-casting and injection mold

Injection mold and Die casting mold is the basic difference is not the same material, one is plastic, one is the alloy, so Die-casting mold to bear much more than the pressure and temperature of the mold, the mold structure needs to strengthen the way feed, Flow channel, cooling design are not the same

1, Die-casting mold injection pressure, so the template is relatively thicker requirements to prevent deformation

2, Die-casting mold gate and injection molds different, need to do spure sperader decomposition of the high-pressure materials

3, Die-casting mold Die does not require quenching, because the Die cavity when the cavity temperature exceeds 700 degrees, so every time the equivalent of a quenching mold cavity will be more and more hard. The general injection mold to be quenched to HRC52 or more.

4. Die-casting mold cavity to the general nitriding treatment to prevent the alloy Die cavity.

5. General Die-casting mold corrosion is relatively large, the outer surface of the general blue treatment.

6. Compared with the injection mold, Die-casting mold with the activities of the part (such as Core pulling slider) with the gap to be larger,Because the high temperature of the Die-casting process will cause thermal expansion.If the gap is too small will cause the mold stuck

7. Die-casting mold with more demanding parting, because the alloy flow of plastic is much better than the high temperature and pressure of the material from the sub-surface flying out will be very dangerous

8. Injection mold generally by thimble, sub-surface, etc. can be exhausted, Die-casting mold must open the exhaust slot and set the slag bag (collecting cold material head);

9. Inconsistent molding, injection mold injection speed, a pressure injection. Plastic mold is usually divided into several sections of injection

10. Die-casting mold for a 2-plate mold, plastic mold different product structure is not the same

At the same time the following points need to pay attention to:

1, the runner is not the same Die-casting mold runner is relatively wide, feeding GATE area to calculate the size of the product size, the general GATE thickness of the product as far as possible not to exceed the product thickness (75% on it), Die casting mode feed only one , While the plastic mold can be used to point into the plastic, the potential plastic mouth (or diving thimble), horn feeding, large outlet directly feed.

2, because the high temperature of the Die-casting (670 degrees), the mold material with the cooling requirements of the material to do with hot just 8407, DAC55, SKD61, etc. (Die, slider, male and female mouth) To balance the flow channel to go to cool, male and female irrigation mouth, male and female templates have to cool.

3, mold demolition as simple as possible (to consider the direction of the burr to facilitate the development of post-processing, sub-surface to consider exhaust, as with the Die surface level, the template exhaust mill (0.15MM), to add flash Difficult to shape the product but also increase the vacuum.

4, the mold structure as simple as possible not with the top (because the aluminum chip will Die stuck), fly to be careful, 0.05 ~ 0.06 or so will have flash, and easy to Die, if the slider.

5, the strength of the product than the plastic pieces of plastic parts, but with the same pieces of plastic as wall thickness to be uniform, BOSS column flesh more than 1.2MM do not need to add ribs, but the bottom must add R angle, corner also add R angle.

Druckgussform und Spritzgießen Unterscheidung

Spritzgussform und Werkzeugform grundlegende Unterschied Gießen ist, dass das Material nicht das gleiche ist, ein Kunststoff ist, eine Legierung ist, Druckgussform so große Kunststoff-Formenbau mehr aushalten als Druck und Temperatur, die Notwendigkeit, die Struktur der Form, Fördermodus zu stärken, Läufer, nicht das gleiche Kühl Design

1, der Einspritzdruck sterben Gussform groß ist, erfordert die Vorlage relativ dicker, Verformung zu verhindern

2, sterben Form Spritzgießwerkzeug Tor und unterschiedliche Bedürfnisse Gießen Shunt Kegel Zersetzung Strom von hohem Druck durchgeführt werden

3, Druckgussform nicht kernel Härten erforderlich ist, als Druckgussformhohlraum, wenn die Temperatur 700 Grad überschreitet, so jedes Mal, das Äquivalent eines Quench bilden. Der Hohlraum wird immer schwieriger geworden. Und allgemeine Spritzgießform zu HRC52 oder mehr gehärtet werden.

4. Die Gießhohlraum zu allgemeinen Nitrierbehandlung, Kleben Legierung Formhohlraum zu verhindern.

5. Allgemeine Korrosion Gießform relativ groß ist, die äußere Oberfläche im allgemeinen blueing.

6. Im Vergleich mit der Spritzform, Druckguss-Formteil mit Aktivität (wie Slide Core) mit dem Spalt größer zu sein,

Die Casting-Prozess, da die hohe Temperatur thermische Ausdehnung verursacht. Wenn der Spalt zu klein ist, wird dazu führen, Schimmel stecken

7. Die Gießform Trennflächen mit höheren Anforderungen, da die Legierung viel besser fließen als Kunststoff-Hochtemperatur-Hochdruckstrom aus der Trennlinie zu fliegen wird sehr gefährlich

8. in der Regel durch Spritzgießwerkzeug Fingerhut und andere Untergrund kann erschöpfen, Gussformen müssen Auslasskanäle und stellen Krätze (sammeln kaltes Material Fütterung Kopf) öffnen;

9. inkonsistent Formen, sterben Formeinspritzgeschwindigkeit Giessen, Spritzdruckperiode. Kunststoff-Spritzgussform in der Regel in Abschnitte gegliedert

10. Die Gießform ist eine Zwei-Platten-Formform, Kunststoff-Formenbau unterschiedliche Produktstruktur ist nicht das gleiche

Zugleich sollten die folgenden Punkte zu beachten:

1, ist nicht das gleiche runner runner sterben relativ breit, Futter GATE Bereich Gießen sollte entsprechend der Größe des Produktgewichts, des allgemeinen GATE so breit wie die Dicke von nicht mehr als die Dicke des Produkts (75% davon) berechnet werden, Druckgussform Futter nur einen Weg, und die Kunststoff-Form kann in den Kunststoff zeigen, die Kunststoff-Mund latent (oder versteckt Fingerhut), Sackgasse Futter, große Austritts direkte Einspeisung.

2, wegen der hohen Druckgusstemperatur (etwa 670 Grad), das Formmaterial mit einer höheren Kühlbedarf, Materialverbrauch Wärme nur 8407, DAC55, SKD61 usw. (Kernel-Modus, Schieber, männliche und weibliche Füllen der Mund), Formkernkühlung zu tun gleichmäßig zu balancieren, einen Läufer Kühlung, Bewässerung Mund männliche und weibliche, männliche und weibliche schablone auch gekühlt zu verlassen.

3, Schimmel Form Entfernung so einfach wie möglich (als leicht zu werden, nachdem die Richtung der Flash-Verarbeitung, Abgasteiloberfläche zu wachsen, so weit zu prüfen, wie möglich mit der flachen Oberfläche der Form, die Vorlage Mühle Entlüftung (etwa 0,15 mm), in den Überlauf, zu vergleichen, harte Produkte geformt, sondern auch evakuiert hinzufügen.

4, die Formstruktur kann nicht so einfach, Neigung verwendet werden (wie Aluminiumschrott stecken würde sterben), sorgfältig Flugmodus, wird es etwa 0,05-0,06 Blitz sein, und Easy-Modus zu halten, wenn sich der Schieber, Freiloch zu haben .

5, sterben Produktstärke Gießen als die Kunststoffteile gut ist, aber mit den gleichen Kunststoffteile wie Wanddicke sollte einheitlich sein, Spalte Fleisch 1.2MM BOSS nicht mehr Gaga Gluten brauchen, aber R müssen Sie die untere Ecke hinzugefügt werden, sollte die Ecke auch R erhöhen Winkel.

Die Casting-Prozess

Druckguss (für kurze Druckguss) ist eine Substanz, unter hohem Druck, ein flüssiges oder halbflüssiges Metall mit hoher Geschwindigkeit die-Typ Füllung der Kavität und Formen und Verfestigen unter Druck, ein Gießverfahren zu erhalten.

Features:
Druckguss und Hochleistungsfüllmaschinen Typ-Casting ist die zwei wichtigsten Merkmale. Es ist allgemein in der Einspritzdruck von den Tausenden bis Zehn kPa, sogar bis zu 2 x 105kPa verwendet. Füllrate von etwa 10 ~ 50 m / s, manchmal sogar bis zu 100 m / s oder mehr. Zeit Füllung ist sehr kurz, in der Regel im Bereich von 0,01 bis 0,2 s. Im Vergleich zu anderen Methoden der Gießen, Gießen hat die folgenden drei Vorteile:

Vorteile:
1. gute Qualität
Hohe Präzision Gießgröße, in der Regel das Äquivalent von 6 bis 7, sogar bis zu Grad 4; Oberfläche, in der Regel das Äquivalent von 5 bis 8, hohe Festigkeit und Härte, Festigkeit als Sandguss in der Regel um 25 bis 30% erhöht, sondern erstreckt sich reduzieren die Rate von etwa 70%, Dimensionsstabilität, Austauschbarkeit gut, kann sein Druckguss dünnwandigen Komplex. Zum Beispiel sterben die aktuelle Zink-Legierung Mindestwanddicke von bis zu 0,3 mm Gießen, Aluminium-Gusslegierungen von bis zu 0,5 mm; Steigung von mindestens 0,75 mm, die kleinste Blende 0,7 mm gegossen wird.

2. Hohe Effizienz in der Produktion
Maschinenproduktionsrate, wie häusliche JⅢ3 horizontal Druckgießmaschine kalte Luft 8 Stunden 600 bis 700 Druckguss- Durchschnitt kann, kleine heiße Kammer Druckgießmaschine alle acht Stunden im Durchschnitt von 3000 bis 7000 kann Druckguss, Werkzeugbau-Typ lange Lebensdauer, ein Paar von Druckguss-Typ, Druckguss-Legierung Glocke, das Leben von bis zu Hunderttausenden von Zeiten, oder sogar Millionen von Zeiten, einfach zu Mechanisierung und Automatisierung.

3. gute wirtschaftliche Wirkung
Da Gießen genaue Größe, glatte Blattwanne und so weiter. Im allgemeinen sind nicht mehr direkt bearbeitet werden verwenden oder Verarbeitungsvolumen ist klein, so dass nicht nur eine Verbesserung der Nutzungsrate des Metalls, sondern reduziert auch die Menge der Verarbeitungsausrüstung und Arbeit; Preis Gießen wird leicht sein, in Kombination mit Metalldruckguss oder andere nichtmetallische Materialien verwendet werden können . Speichern von Montagearbeiten und sparen Metall.
Während Gießen hat viele Vorteile, aber es gibt einige Nachteile zu lösen.

Nachteile:
1) Da das Flüssigmetall-Druckguss Kavitätenfüllung Geschwindigkeit hoch ist, ist der Strömungszustand instabil, so dass die Verwendung von allgemeinen Gussverfahren ist das Gießen leicht Porosität zu erzeugen, kann die Wärmebehandlung nicht durchgeführt werden;
2) des konkaven komplexen Gießen, Gießen erschwert;
3) Schmelzpunkt Legierungen (wie Kupfer, Eisen-Metalle), geringere Druck Typ Leben;
4) sollte nicht die Kleinserienproduktion sein, vor allem aufgrund der hohen Herstellungskosten Art Guss, Druckguss-Maschine Produktion von hocheffizienten, Kleinserienfertigung unwirtschaftlich.

Die Casting-Anwendung und Entwicklungstrends
Druckgießen eines der modernsten Metallformungsverfahren ist, ist ein kleiner Chip zu erreichen, Chip freie und effektive Art und Weise, eine sehr breite Anwendung, hat sich rasch entwickelt. Casting Größe und Gewicht, in Abhängigkeit von der Kraft der Druckgussmaschine. Aufgrund der zunehmenden Kraft der Druckgussmaschine, die Form der Größe von wenigen Millimetern bis zu 1 ~ 2m Gießen; Gewicht von wenigen Gramm bis zu zehn Kilogramm. Im Ausland Druck Durchmesser 2m, Gewicht 50 kg Aluminium-Gussteile.

Casting nicht mehr nur auf die Automobil- und Haushaltsgeräteindustrie, und nach und nach zu anderen Industriezweigen, wie zum Beispiel Landmaschinen, Werkzeugmaschinenindustrie, Elektronikindustrie, Rüstungsindustrie, Computer, medizinische Geräte erweitern, Uhren, Kameras und Haushalts Hardware Dutzende Industrie, insbesondere: Kfz-Teile, Zubehör Möbel, Bad-Accessoires (Bad), Beleuchtung Teile, Spielzeug, Rasierer, Krawattenklammern, elektrische eine elektronische Teile, Gürtelschnalle, Fall, Metallschnallen, Schlösser, Reißverschlüsse. In Druckgusstechnologie und die Entstehung eines Vakuums-Druckguss, neue Verfahren und Sauerstoff-Druckguss, Präzisionsdruckguss Geschwindigkeit dicht und löslichen Kernanwendungen.
Die Casting-Industrie unseres Landes bei der Förderung eine gute Rolle spielen.

china plastic injection molding mould making