Friday, 12 July 2013
Vertical Injection Moulding Machine
Vertical Injection Moulding Machines
| With years of experience in this domain, we are engaged in offering a wide range of technically advanced Vertical Injection Moulding Machines.
These machines are manufactured using high grade raw material and
cutting edge technology at our sound manufacturing unit. Known for their
performance, finish, operation and durability, these machines find wide
application in various automotive and mechanical industries. Further,
we test these machines as per the requirements of the customers at
market leading prices. STANDARD FEATURES of our Machine 1. Hydraulic vane pump for low noise operation. 2. High Torque Hydro Motor For refilling purpose 3. High Temperature Stability J-Type Thermocouple for Tuning of Barrel Temperatures with Ceramic Heaters 4. Pressure control units for Injection, Refilling & Locking pressure YUKEN Solenoid Valves. 5. J-Type Temperature Controllers. 6. Optional Hydro Motor Attachment to unscrew the article. 7. Stainless steel hopper with material removal system & magnetic rings to protect screw damage possibility. 8. User Friendly Control Panel. Or PLC Based Controller System. 9. High Production Capacity in its type. |
For More details Visit us at :
http://www.indiamart.com/krishnaautomachinery
http://www.k-macindia.com
or
Contact us :
Krishna Auto Machinery
Mr. Sunil Patel / Mr. Samir Patel (Owner)
No. 03, Golden Industrial Estate, Girnar Schooter Compound, Odhav
Ahmedabad - 382415, Gujarat, India
Mr. Sunil Patel / Mr. Samir Patel (Owner)
No. 03, Golden Industrial Estate, Girnar Schooter Compound, Odhav
Ahmedabad - 382415, Gujarat, India
Mobile:
+(91)- 8866474261
+(91)- 9428625514
Horizontal Injection Moulding Machine
Injection Moulding Machines
| With years of experience in this domain, we are engaged in offering a wide range of technically advanced Injection Moulding Machines. These machines are manufactured using high grade raw material and cutting edge technology at our sound manufacturing unit. Known for their performance, finish, operation and durability, these machines find wide application in various automotive and mechanical industries. Further, we test these machines as per the requirements of the customers at market leading prices. |
For More details Visit us at :
http://www.indiamart.com/krishnaautomachinery
http://www.k-macindia.com
or
Contact us :
Krishna Auto Machinery
Mr. Sunil Patel / Mr. Samir Patel (Owner)
No. 03, Golden Industrial Estate, Girnar Schooter Compound, Odhav
Ahmedabad - 382415, Gujarat, India
Mr. Sunil Patel / Mr. Samir Patel (Owner)
No. 03, Golden Industrial Estate, Girnar Schooter Compound, Odhav
Ahmedabad - 382415, Gujarat, India
Mobile:
+(91)- 8866474261
+(91)- 9428625514
Understanding Injection Molding.
Understanding Injection Molding.
For More details Visit us at :
http://www.indiamart.com/krishnaautomachinery
http://www.k-macindia.com
or
Contact us :
Krishna Auto Machinery
Mr. Sunil Patel / Mr. Samir Patel (Owner)
No. 03, Golden Industrial Estate, Girnar Schooter Compound, Odhav
Ahmedabad - 382415, Gujarat, India
Mr. Sunil Patel / Mr. Samir Patel (Owner)
No. 03, Golden Industrial Estate, Girnar Schooter Compound, Odhav
Ahmedabad - 382415, Gujarat, India
Mobile:
+(91)- 8866474261
+(91)- 9428625514
Tooling for injection moulding machine
The injection molding process uses molds,
typically made of steel or aluminum, as the custom tooling. The mold has
many components, but can be split into two halves. Each half is
attached inside the injection molding
machine and the rear half is allowed to slide so that the mold can be
opened and closed along the mold's parting line. The two main components
of the mold are the mold core and the mold cavity. When the mold is
closed, the space between the mold core and the mold cavity forms the
part cavity, that will be filled with molten plastic to create the
desired part. Multiple-cavity molds are sometimes used, in which the two
mold halves form several identical part cavities.
Mold overview
Mold base
The mold core and mold cavity are each mounted to the mold base, which is then fixed to the platens inside the injection molding machine. The front half of the mold base includes a support plate, to which the mold cavity is attached, the sprue bushing, into which the material will flow from the nozzle, and a locating ring, in order to align the mold base with the nozzle. The rear half of the mold base includes the ejection system, to which the mold core is attached, and a support plate. When the clamping unit separates the mold halves, the ejector bar actuates the ejection system. The ejector bar pushes the ejector plate forward inside the ejector box, which in turn pushes the ejector pins into the molded part. The ejector pins push the solidified part out of the open mold cavity.
Mold channels
In order for the molten plastic to flow into the mold cavities, several channels are integrated into the mold design. First, the molten plastic enters the mold through the sprue. Additional channels, called runners, carry the molten plastic from the sprue to all of the cavities that must be filled. At the end of each runner, the molten plastic enters the cavity through a gate which directs the flow. The molten plastic that solidifies inside these runners is attached to the part and must be separated after the part has been ejected from the mold. However, sometimes hot runner systems are used which independently heat the channels, allowing the contained material to be melted and detached from the part. Another type of channel that is built into the mold is cooling channels. These channels allow water to flow through the mold walls, adjacent to the cavity, and cool the molten plastic.
Mold - Exploded view
Mold design
In addition to runners and gates, there are many other design issues that must be considered in the design of the molds. Firstly, the mold must allow the molten plastic to flow easily into all of the cavities. Equally important is the removal of the solidified part from the mold, so a draft angle must be applied to the mold walls. The design of the mold must also accommodate any complex features on the part, such as undercuts or threads, which will require additional mold pieces. Most of these devices slide into the part cavity through the side of the mold, and are therefore known as slides, or side-actions. The most common type of side-action is a side-core which enables an external undercut to be molded. Other devices enter through the end of the mold along the parting direction, such as internal core lifters, which can form an internal undercut. To mold threads into the part, an unscrewing device is needed, which can rotate out of the mold after the threads have been formed.
Mold overview
Mold base
The mold core and mold cavity are each mounted to the mold base, which is then fixed to the platens inside the injection molding machine. The front half of the mold base includes a support plate, to which the mold cavity is attached, the sprue bushing, into which the material will flow from the nozzle, and a locating ring, in order to align the mold base with the nozzle. The rear half of the mold base includes the ejection system, to which the mold core is attached, and a support plate. When the clamping unit separates the mold halves, the ejector bar actuates the ejection system. The ejector bar pushes the ejector plate forward inside the ejector box, which in turn pushes the ejector pins into the molded part. The ejector pins push the solidified part out of the open mold cavity.
Mold channels
In order for the molten plastic to flow into the mold cavities, several channels are integrated into the mold design. First, the molten plastic enters the mold through the sprue. Additional channels, called runners, carry the molten plastic from the sprue to all of the cavities that must be filled. At the end of each runner, the molten plastic enters the cavity through a gate which directs the flow. The molten plastic that solidifies inside these runners is attached to the part and must be separated after the part has been ejected from the mold. However, sometimes hot runner systems are used which independently heat the channels, allowing the contained material to be melted and detached from the part. Another type of channel that is built into the mold is cooling channels. These channels allow water to flow through the mold walls, adjacent to the cavity, and cool the molten plastic.
Mold - Exploded view
Mold design
In addition to runners and gates, there are many other design issues that must be considered in the design of the molds. Firstly, the mold must allow the molten plastic to flow easily into all of the cavities. Equally important is the removal of the solidified part from the mold, so a draft angle must be applied to the mold walls. The design of the mold must also accommodate any complex features on the part, such as undercuts or threads, which will require additional mold pieces. Most of these devices slide into the part cavity through the side of the mold, and are therefore known as slides, or side-actions. The most common type of side-action is a side-core which enables an external undercut to be molded. Other devices enter through the end of the mold along the parting direction, such as internal core lifters, which can form an internal undercut. To mold threads into the part, an unscrewing device is needed, which can rotate out of the mold after the threads have been formed.
Plastic Injection Molding Process in Detailed.
Injection molding is the
most commonly used manufacturing process for the fabrication of plastic
parts. A wide variety of products are manufactured using injection
molding, which vary greatly in their size, complexity, and application.
The injection molding process requires the use of an injection molding
machine, raw plastic material, and a mold. The
plastic is melted in the injection molding machine and then injected
into the mold, where it cools and solidifies into the final part.
Injection molding is used to produce thin-walled plastic parts for a wide variety of applications, one of the most common being plastic housings. Plastic housing is a thin-walled enclosure, often requiring many ribs and bosses on the interior. These housings are used in a variety of products including household appliances, consumer electronics, power tools, and as automotive dashboards. Other common thin-walled products include different types of open containers, such as buckets. Injection molding is also used to produce several everyday items such as toothbrushes or small plastic toys. Many medical devices, including valves and syringes, are manufactured using injection molding as well.
Process Cycle of Injection molding Machine
The process cycle for injection molding is very short, typically between 2 seconds and 2 minutes, and consists of the following four stages:
1. Clamping - Prior to the injection of the material into the mold, the two halves of the mold must first be securely closed by the clamping unit. Each half of the mold is attached to the injection molding machine and one half is allowed to slide. The hydraulically powered clamping unit pushes the mold halves together and exerts sufficient force to keep the mold securely closed while the material is injected. The time required to close and clamp the mold is dependent upon the machine - larger machines (those with greater clamping forces) will require more time. This time can be estimated from the dry cycle time of the machine.
2. Injection - The raw plastic material, usually in the form of pellets, is fed into the injection molding machine, and advanced towards the mold by the injection unit. During this process, the material is melted by heat and pressure. The molten plastic is then injected into the mold very quickly and the buildup of pressure packs and holds the material. The amount of material that is injected is referred to as the shot. The injection time is difficult to calculate accurately due to the complex and changing flow of the molten plastic into the mold. However, the injection time can be estimated by the shot volume, injection pressure, and injection power.
3. Cooling - The molten plastic that is inside the mold begins to cool as soon as it makes contact with the interior mold surfaces. As the plastic cools, it will solidify into the shape of the desired part. However, during cooling some shrinkage of the part may occur. The packing of material in the injection stage allows additional material to flow into the mold and reduce the amount of visible shrinkage. The mold can not be opened until the required cooling time has elapsed. The cooling time can be estimated from several thermodynamic properties of the plastic and the maximum wall thickness of the part.
4. Ejection - After sufficient time has passed, the cooled part may be ejected from the mold by the ejection system, which is attached to the rear half of the mold. When the mold is opened, a mechanism is used to push the part out of the mold. Force must be applied to eject the part because during cooling the part shrinks and adheres to the mold. In order to facilitate the ejection of the part, a mold release agent can be sprayed onto the surfaces of the mold cavity prior to injection of the material. The time that is required to open the mold and eject the part can be estimated from the dry cycle time of the machine and should include time for the part to fall free of the mold. Once the part is ejected, the mold can be clamped shut for the next shot to be injected.
After the injection molding cycle, some post processing is typically required. During cooling, the material in the channels of the mold will solidify attached to the part. This excess material, along with any flash that has occurred, must be trimmed from the part, typically by using cutters. For some types of material, such as thermoplastics, the scrap material that results from this trimming can be recycled by being placed into a plastic grinder, also called regrind machines or granulators, which regrinds the scrap material into pellets. Due to some degradation of the material properties, the regrind must be mixed with raw material in the proper regrind ratio to be reused in the injection molding process.
Injection molding is used to produce thin-walled plastic parts for a wide variety of applications, one of the most common being plastic housings. Plastic housing is a thin-walled enclosure, often requiring many ribs and bosses on the interior. These housings are used in a variety of products including household appliances, consumer electronics, power tools, and as automotive dashboards. Other common thin-walled products include different types of open containers, such as buckets. Injection molding is also used to produce several everyday items such as toothbrushes or small plastic toys. Many medical devices, including valves and syringes, are manufactured using injection molding as well.
Process Cycle of Injection molding Machine
The process cycle for injection molding is very short, typically between 2 seconds and 2 minutes, and consists of the following four stages:
1. Clamping - Prior to the injection of the material into the mold, the two halves of the mold must first be securely closed by the clamping unit. Each half of the mold is attached to the injection molding machine and one half is allowed to slide. The hydraulically powered clamping unit pushes the mold halves together and exerts sufficient force to keep the mold securely closed while the material is injected. The time required to close and clamp the mold is dependent upon the machine - larger machines (those with greater clamping forces) will require more time. This time can be estimated from the dry cycle time of the machine.
2. Injection - The raw plastic material, usually in the form of pellets, is fed into the injection molding machine, and advanced towards the mold by the injection unit. During this process, the material is melted by heat and pressure. The molten plastic is then injected into the mold very quickly and the buildup of pressure packs and holds the material. The amount of material that is injected is referred to as the shot. The injection time is difficult to calculate accurately due to the complex and changing flow of the molten plastic into the mold. However, the injection time can be estimated by the shot volume, injection pressure, and injection power.
3. Cooling - The molten plastic that is inside the mold begins to cool as soon as it makes contact with the interior mold surfaces. As the plastic cools, it will solidify into the shape of the desired part. However, during cooling some shrinkage of the part may occur. The packing of material in the injection stage allows additional material to flow into the mold and reduce the amount of visible shrinkage. The mold can not be opened until the required cooling time has elapsed. The cooling time can be estimated from several thermodynamic properties of the plastic and the maximum wall thickness of the part.
4. Ejection - After sufficient time has passed, the cooled part may be ejected from the mold by the ejection system, which is attached to the rear half of the mold. When the mold is opened, a mechanism is used to push the part out of the mold. Force must be applied to eject the part because during cooling the part shrinks and adheres to the mold. In order to facilitate the ejection of the part, a mold release agent can be sprayed onto the surfaces of the mold cavity prior to injection of the material. The time that is required to open the mold and eject the part can be estimated from the dry cycle time of the machine and should include time for the part to fall free of the mold. Once the part is ejected, the mold can be clamped shut for the next shot to be injected.
After the injection molding cycle, some post processing is typically required. During cooling, the material in the channels of the mold will solidify attached to the part. This excess material, along with any flash that has occurred, must be trimmed from the part, typically by using cutters. For some types of material, such as thermoplastics, the scrap material that results from this trimming can be recycled by being placed into a plastic grinder, also called regrind machines or granulators, which regrinds the scrap material into pellets. Due to some degradation of the material properties, the regrind must be mixed with raw material in the proper regrind ratio to be reused in the injection molding process.
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