Die casting-Die Casting - Advantages and Disadvantages

Die casting is aDie casting process in which molten metal is forced under high pressure into mold cavities。 The metal hardens to get a desired shape。 In recent times，zinc die casting plastic molded parts have replaced die-casting， as they are cheaper and lighter than die cast parts。 Die-casting can be done using a cold chamber or hot chamber process。

About Process
widespread non-expendable technique in which metal are forced into the mold cavity under high pressure。 Die casting mold that are known as dies can bezinc die casting used repeatedly to produce castings in a variety of sizes， shapes and wall thickness。 The mold cavities are designed with intricate designs that enables in producing complex shapes with accuracy， surface finish and attractiveness。。

History of Die Casting

In the early days of die casting only low-pressure injection method was used， but today high-pressure casting techniques like squeeze casting and semi-solid die casting methods are use to cast more than 4500 pounds per square inch。 Initially， only tin and lead were die caste， but now magnesium， copper and other alloys are also to cast using this highly popular process。

Die Casting Process

In this process molten metal or other materials are forced， under high pressure into the cavities of the steel mold。 Dies are two part molds that are made of alloy tool steel - The fixer die half and the ejector die half。 The die or mold is fabricated with the impression of the component that is to cast。 There are four types of dies:

Single cavity to produce one component
Multiple cavity to produce a number of identical parts
Unit die to produce different parts at one time
Combinations die to produce several different parts for an assembly

The molten metal is injected into the die under high pressure and high speed， which helps in producing a casting that is smooth and precise as the original mold。 The pressure is maintained on the mold until the hot metal solidifies。 When the metal is hardened， the die is opened to remove the casting。

There are several variations on the basic process that can be used to produce castings for specific applications。 These include:

Squeeze casting - A method by which molten alloy is cast without turbulence and gas entrapment at high pressure to yield high quality， dense， heat treatable components。

Semi-solid molding - A procedure where semi-solid metal billets are cast to provide dense， heat treatable castings with low porosity。

Alloys used

Aluminum， copper， lead， zinc and tin based alloys are predominantly used in die-casting。

Automation

In modern day， sophisticated die casting machines are used that ensures consistent quality control。 Every machined die-casting differs in the method in which molten mealMulti slider die casting machine is poured into the die。 Automations are used to lubricate dies， pour the metal into the chamber， etc。die casting machine Two processes called the hot chamber and the cold chamber methods are used for die casting。

Applications

Die casting is most suitable for casting medium sized parts with complex details。 Die-casting is the largest casting technique that is used to manufacture consumer， commercial and industrial products like automobiles， toys， parts of sink faucet， connector housing， gears， etc。 Most die castings are done from non-ferrous metals like aluminum， magnesium， etc。

Advantages

Economical process that can be used for a wide range of complex application
Parts have longer service life， dimensional accuracy and close tolerance
Post machining can be totally eliminated
A process that can be fullyMulti slider die casting machine automated
Mold can be use repeatedly。

Disadvantages

Casting weight must be between 30 grams。
Casting must be smaller than 600 mm (24 in)
High initial cost。
Limited to high-fluidity metals。

Custom Mold Rubber Parts-An Overview of the O-Ring and Its Application

Have you ever heRubber O-Ringard of the O-ring? If not， you can read the following passage。 This article will tell you something about this ring。 The so-called O-ring is a kind of rubber seal ring whose section is circular。 Owing to its round section， it is called O-shaped seal ring or O-ring。 The main material for this ring is Buna-N rubber or fluorubber。 This ring is one of the common seal elements inRubber Seal the fluid pressure and gas pressure transmission system。 It is mainly used in the static seal and the alternative motion seal。 The applicable speed ranges from 0。005 to 0。3 meter per second。 In the normal situation， it is not so popular in the rotary motion seal equipment。 The O-ring is often installed in the groove。

Compared with other seal rings， the O-ring has the following unique features: (1) the structure is small and exquisite； (2) it is easy to install and remove； (3) the ring is applicable in the static and dynamic seals； (3) its friction drag is relatively small； (4) the single O-ring can play an important role in two directions´ seal； (5) its price is quite cheap； (6) it is applicable for different seal media， such as oil， water， gas， chemical medium and other mixed media； (7) its sealability is very reliable。

Now the article will introduce how to mark the O-ring。 It can be marked ad follow: inner diameter plus lead wire diameter。 For example， O-ring 20*2。4， GB1235-76。 Here 20 means the inner diameter of the great circle is 20mm。 2。4 means the section diameter of the rubber gasket is 2。4mm。 GB1235 refers to the standard number。 76 represents the standard year。 Therefore， when you buy the O-ring， you ´d better keep an eye on these numbers。

Generally speaking， the O-ring is mainly applied in the static seal and the alternating motion seal。 If it is used in the rotating motion seal， it will be limited by the seal equipment with low rotating speed。 On basis ofRubber Gasket the material of this seal ring， it can have the good seal effectiveness and at theRubber Parts same time it can reduce the shock in some harsh environments， such as chemical liquid， oil， acid liquid and so on。 Owing to its unique features， it is widely used in a lot of industries， such as machine tool， boat， automobile， metallurgical machinery， chemical machinery， engineering machinery， building machinery， plastics， agriculture and different instruments。

SeekPart。com is the global B2B platform in the industry of mechanical parts。 SeekPart aggregates the trade leads in this area， and our ultimate targetCustom Mold Rubber Parts is to benefit the buyers and sellers of mechanical parts by utilizing these leads through our online tools。

IP66-Overview of Bangladesh Garment Industry

Agriculture， as Industrial monitorthe case in India， has been the backbone of economy and chief source of income for the people of Bangladesh， the country made of villages。 Government wants to decrease poverty by getting highest productivity from agriculture and achieve self-reliance in food production。 Apart from agriculture， the country is much concerned about the growth of export division。 Bangladesh have accelerated and changed her exports substantially from time to time。 After Bangladesh came into being， jute and tea were the most export-oriented industries。 Butdigital signage with the continual perils of flood， failing jute fibre prices and a considerable decline in world demand， the role of theFanless pc jute sector to the country´s economy has deteriorated (Spinanger， 1986)。 After that， focus has been shifted to the function of production sector， especially in garment industry。

The garment industry of Bangladesh has been the key export division and a main source of foreign exchange for the last 25 years。 At present， the country generates about $5 billion worth of products each year by exporting garment。 The industry provides employment to about 3 million workers of whom 90% are women。 Two non-market elements have performed a vital function in confirming the garment industry´s continual success； these elements are (a) quotas under Multi- Fibre Arrangement1 (MFA) in the North American market and Industrial pc(b) special market entry to European markets。 The whole procedure is strongly related with the trend of relocation of production。

Displacement of Production in the Garment Industry

The global economy is now controlled by the transfer of production where firms of developed countries swing their attention to developing countries。 The new representation is centred on a core-periphery system of production， withBox PC a comparatively small centre of permanent employees dealing with finance， research and development， technological institution and modernisation and a periphery containing dependent elements of productionAll in one computer procedure。 Reducing costs and increasing output are the main causes for this disposition。 They have discovered that the simplest way to undercharge is to move production to a country where labour charge and production costs are lower。 Since developing nations provideVideo wall areas that do not impose costs like environmental degeneration， this practice protects the developed countries against the issues of environment and law。 The transfer of production to Third World has helped the expansion of economy of these nations and also speed up the economy of the developed nations。

Garment industry is controlled by the transfer of production。 The globalisation of garment production started earlier and has expanded more than that of anyIP66 other factory。 The companies have transferred their blue-collar production activities from high-wage areas to low-cost manufacturing regions in industrialising countries。 The enhancement of communication system and networking has played a key role in this development。 Export-oriented manufacturing has brought some good returns to the industrialising nations of Asia and Latin America since the 1960s。 The first relocation of garment manufacturing took place from North America andpanel PC Western Europe to Japan in the 1950s and the early 1960s。 But during 1965 and 1983， Japan changed its attention to more lucrative products like cars， stereos and computers and therefore， 400，000 workers were dismissed by Japanese textile and clothing industry。 In impact， the second stock transfer of garment manufacturing was from Japan to the Asian Tigers - South Korea， Taiwan， Hong Kong and Singapore in 1970s。 But the tendency of transfer of manufacturing did not remain there。 The rise in labour charge and activeness of trade unions were in proportion to the enhancement in economies of the Asian Tigers。 The industry witnessed a third transfer of manufacturing from 1980s to 1990s； from the Asian Tigers to other developing countries - Philippines， Malaysia， Thailand， Indonesia and China in particular。 The 1990s have been led by the final group of exporters including Bangladesh， Srilanka， Pakistan and Vietnam。 But China was leader in the current of the relocation as in lesssunlight readable than ten years touch screen monitor(after 1980s) China emerged from nowhere to become the world´s major manufacturer and exporter of clothing。

sintered metal-Something About Sintered Metal Powder Bearings

According to thepowder metal forms of friction on work， bearings can be divided into rolling bearings and plain bearings。 And the latter can further be divided into self-lubricating bearings， oil lubricated bearings and gas lubricated bearings。

Bearings that produced by powder metallurgy method generally known as lurgy self-lubricating bearings， sintered metal powder bearings， and sintered metal bearings。

Powder metallurgy oil-impregnated bearing is a kind of alloy product。 When the shaft rotates， due to the friction between the shaft and bearings， bearing temperature will be increased and there will be a pump suction function。 As a result， oil will leak on the internal diameter of the friction surface。 When the shaft stops rotating， the oil will be back to the inside of bearings。 It is the working process of self-lubricating bearings。 Therefore， these products have less consumption of lubrication oil。 They can operate in a long period of time without the offering of external oil。 They are especially suitable for some special places。

Oil-impregnated bearings have many advantages。 Firstly， they are less noisy than the rolling bearings。 The vibration is small。 It is easy to produce them。 They do not require special oil supply。 Besides， they have flexible shape design。 They can be manufactured in a large amount。 The prices are comparatively low。

At the same time， they also carry a lot of disadvantages。 Because they are sliding bearings， their friction coefficient is bigger than the rolling bearings´。 Besides， costs will be high if they are produced in a small scale。

It should be clarified that the name of the oil-impregnated bearings does not mean that they do not require additional oil。 It just shows that they have already carried a certain amount of oil。 And it is unnecessary to add a lot of oil to them。

Sintered metal powder bearing has become essential part for the development of the automotive， appliance， audio equipment， office equipment， precision machinery。 Currently， according to bearing usage， the main transport machinery such as cars account for about 41%。 And the industrial machinary like office machinery take up about 21%。 Other applications account for about 5%。

Except for the important usage of the sintered metal powder bearing， the amount of bearing material is increased gradually。 Meanwhile， it plays a more and more important role in the manufacturing of machinery。 Now， sintered metal powder bearing material is not only the substitute for some traditional bearing alloys， but also a kind of important structural material in the mechanical manufacturing industry。

SeekPart is the global B2B platform in the industry of mechanical parts。 SeekPart aggregates the trade leads in this area， and our ultimate target is to benefit the buyers and sellers of mechanical parts by utilizing these leads through our online tools。

廠房通風-綜合考慮廚衛排風扇選購支招

排氣扇具有價低、風量大、耗能小等廠房通風特點，是普通家庭室內通風換氣的較佳選擇，即使是有能力安裝油煙機等産品的家庭，安裝排風扇作爲輔助換氣裝置也是不錯的選擇。關于排風扇應該如何選購，相信通過前面了解了排風扇種類的業主心中應該有一定把握了。下面再給大家支點招，確保都能買到適合自家的排風扇産品。

一、廚房排風扇選購

廚房是烹饪美食的地方，往往油煙會成爲我們頭疼的問題。在選用廚房用的排風扇時，除了根據空間選擇合適換氣方式等的産品外，還需要重點注意排風扇的功率。

廚房宜選大功率的排風扇

廚房的油煙需要瞬時大型排風扇快速排出，因此相比于衛浴間，廚房要選擇功率較大的排風扇産品。盡量選擇較大功率和葉輪尺寸的免清洗排風扇，必要時可安裝2—3台排氣扇。此外，注意不要選天花板式排風扇，畢竟廚房油煙較多，安裝在頂上不僅排煙效果一般，且清潔不易。

二、衛浴間排風扇選購

市場上的家用排氣扇分吸頂式、壁挂式和窗式三種。衛生間是潮氣、濕氣的集中區域，選購的時候應根據衛生間的面積大小，通風環境來考慮，還要確定安裝在吊頂上還是安裝在牆上或窗戶上，根據不同的安裝位置，選購不同型號的排風扇。

三、排風扇選購支招

1、注意排風扇的噪音

在選購排風扇時，還要留意其響聲的等級，等級越低的排風扇越好，通常小于三級的是可以接受。

2、檢查外觀

優質的排風扇無論從用料和做工方面都是比較好的，不會出現用料單薄、接縫不均、變形破損的現象。選購時查看排風扇平面是否無翹曲現象，塑料件平整光滑，電鍍件光亮，沒有鏽斑痕迹。

3、試機檢查

選購時，最好將排風扇現場試下。通電通風設備後觀察排風扇的風葉是否旋轉平穩、無異常雜聲與振動，風量足夠等。
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碳纖維-碳纖維加固混凝土技術

碳纖維加固混凝土技術防止了其它加FR4,FRP固方法增大結構尺寸、減少建築使用空間、增加自重、施工周期長、等缺點，最大限度地保證了原有建築布局。

建築科技有限加大截面法是一種常用的墩柱加固方法， 原有的墩柱的外表增加一層混凝土及縱向鋼筋和橫向鋼筋，增加的橫向鋼筋能提高墩柱的剪切強度及延性能力。裂縫采用環氧樹脂壓力灌漿處置及粘貼鋼板處置。裂FR4,FRP縫處置並灌漿，結合玻璃纖維粘鋼法加固處理，增強了屋架上弦的剛度。植筋技術是一項新型的鋼筋混凝土結構加固技術玻璃纖維是一項對混凝土結構較簡捷、電木板有效的連接與錨固技術。已廣泛地應用于已有建築物的加固壓克力改造工程中。其工作原理是：加固過程中新舊混凝土界面的抗剪玻璃纖維力主要由以下幾部分組成：界面混凝土內部結合力界面摩擦力植筋的抗碳纖維剪力。
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光學玻璃-鋼化玻璃的使用範圍有哪些

其實在我們的生活中，我們是可以到CNC玻璃處看到鋼化玻璃的存在的比如說汽車的擋風玻璃，這是在我們的生活中最經常看到

的。在過去的話，一些的房屋的裝修還是光學玻璃非常的少使用到這種玻璃鑽孔的鋼化玻璃的，但是現在的話我們可以發現在很多的室內

的裝修中，這種玻璃的使用是非常的廣泛的，很多人家中的門玻璃研磨窗都是使用這種的鋼化玻璃，因爲其硬度大和不易破碎的

特點，所以使用在室內裝修中是非常的受到大家的喜歡的。
其實鋼化玻璃加工玻璃的使用的範圍是非常的廣泛的，可以說不管是在建築行業還是在汽車行業都是得到了很大範圍的使用的。

除了我們比較 經常看到的之外，其實很多的電子産品也都是使用這種的鋼化玻璃的。毫不誇張的說，在這個世界上已

經是離不開鋼化玻璃了，它的身影可以說是無處不在的。
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會場佈置-草坪婚禮策劃之會場布置方案

草坪婚禮屬于戶外婚禮，新辦公家具 台中人舉會場佈置辦草坪婚禮是希望在衆人和大自然的見證下共同進入婚姻殿堂。下面的是草坪婚禮策劃之會場布置方案，希望能給你的婚禮提供可用的建議帳篷出租。

草坪婚禮策劃1。迎賓牌

使用長腳立式迎賓牌，綴以用珠光白色或淡綠色緞帶包紮 好的長春藤和白色羽毛，制成瀑布式下垂樣式，用料需豐滿。迎賓牌 用內附精美寫真-內容：“XX年我們結婚啦！”下附新郎、新娘名字 。

草坪婚禮策劃2。迎賓台

長方形桌子2張，上面鋪紅色桌布及精美台花一個；全新2 本紅色嘉賓簽到簿，簽字筆2支。全新透明玻璃長型立式容器1-2個( 裝禮金紅包用的)，容器下部系金色寬緞帶。

草坪婚禮策劃3。宴會會場鋪紅地毯

從入口處開始，間隔擺放若2-3個精美絹花拱 門，形成一條通道一直延伸至中央舞台處。(客方引座員要注意提示 來賓不要碰觸及損壞拱門絹花。)

草坪婚禮策劃4。餐桌物品

每張餐桌上放置喜煙、打火機、雪碧、可樂、啤酒等食飲品，瓶口均系金色細緞帶。

草坪婚禮策劃5。舞台、舞台風格

舞台上側設置投影儀和投射桌椅出租屏幕，另一側擺放音響設備，由會場提 供無舞台架設線麥克風2-3個。

背景以紅、白、紫三色寬緞帶做布置，間隔從上方垂下 ，拖曳于舞台上。其間點綴以串了白色羽毛及彩色珠子的銀色長線， 從上方垂下，或長或短，距離或寬或窄。舞台頂端搭個架子，用常春 藤纏繞，略垂下各色緞帶和羽燈光音響毛珠簾舞台四周擺放金色或白色藝術立 柱，柱頂擺放各色花球，垂下常春藤。新人自制婚照展架背景可以立 在舞台前檐。
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物料架-倉儲貨架産品技術參數一般包括以下幾個方面

　　1。 據所提供的倉儲貨架布置堆高機草圖，自主設計倉儲貨架工程施工圖，包括平面布置圖、立體圖、剖面圖、細部結構圖。倉儲貨架工程施工圖作爲合理解釋是投標報價的基礎。

台車　　2。 倉儲貨架施工圖設計要求如下：

　　(1)倉儲貨架種類：駛入式倉儲貨架和橫梁式倉儲貨架。

　　(2)貨位數量：駛入式倉儲貨架3834個，橫梁式倉儲貨架512個。

　　(3)倉儲貨架層數計及高度：駛入式倉儲貨架兩層牛腿三層貨，一層淨高3。3米，二層淨高1。85米，三層淨高1。85米，倉儲貨架總高度爲7。3米。

　　(4)倉儲貨架柱片淨距：駛入式倉儲貨架1。4米；橫梁式倉儲貨架2。3米。

　　(5)駛入式倉儲貨架材料規格及要求：立柱規格爲>85x65。

　　(6)通道寬度：駛入式主通道寬度4 m以上，橫梁式主通道3。5米。

　　(7)倉儲貨架選用托盤：駛入式規定爲1200x1500，材料爲鋼質，短邊進叉，貨載要求>1000 Kg。橫梁式規格爲1000x1200，材料爲木質，短邊進叉，貨載要求>1000 Kg。

　　(8)客戶可對該項目進行用材等方面優化，主要考慮提高庫房利用率與作業效率及節省作業承包庫房貨架和超市貨架有一定的區別，超市貨架除具有存儲功能外，另一重要的功能即是展示作用。它的高度通常以人的身高爲設電動堆高機計依據，所以大多數超市貨架更側重于3米以下結物料架構設計。相對于超市貨架，倉儲貨架普遍應用于工業倉庫，更著重于向上發展，充分利用存儲空間，最大高度可達到40米以上，大型物流中心的設計可以是庫架一體式結構，即先建造貨架部分，以貨架爲建築物的支撐結構，後建建築結構，如圍牆，屋頂等。拖板車重點在于存儲、充分利用空間和另一重要功能――快速處理貨物流通的存儲貨架形式。兩種貨架的功能各異，結構也相去甚遠。
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