The heating plates of the presses are rectangular plates. They are made from solid steel plates, ground and milled on all sides. The set consists of two plates. The number of heaters in a mold is determined by its mass (or heat transfer surface area), operating temperature and heater power. Heating plates can be thermoelectric, ohmic or induction.
Orenburg Press Machine Plant produces heating plates for hydraulic press brands DG, DE, P, PB.
The heating plates of the presses are rectangular steel plates with a thickness of 70 mm. They are made from solid steel plates, ground and milled on all sides.
The heating plate consists of two parts fastened together, in one of which grooves are milled for laying heating elements (heating elements). The power of one heating element is from 0.8 to 1.0 kW, the voltage is 110 V. The plates have grooves for placing heating elements with a diameter of 13 mm. Two heating elements connected in series are installed on one phase.
The quality of plastic products is greatly influenced by the temperature at which they are made. The temperature regime of the mold depends on the structure of the material being processed and the characteristics of the technological process chosen to obtain this product.
The set consists of two plates. The number of heaters in a mold is determined by its mass (or heat transfer surface area), operating temperature and heater power. Depending on the required heating power, 6 or 12 heating elements are installed on each plate. The terminals are covered with casings.
For heating molds, electric heaters are mainly used, based on the use of resistance elements of various designs. The space around the spiral is reliably insulated, which increases its service life. The electric heater is located in the thickness of the mold at a distance of 30-50 mm from the shaping surface, because at a closer location, local overheating is possible, which will lead to defective products.
Control of the heating temperature of the plates is ensured by the use of THK thermocouples. A heat-resistant wire, laid in a metal hose, safely connects the plates to the cabinet.
| Heating plates for hydraulic press P, PB | |||
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For heating removable molds, use heating plates, in which channels are drilled for the location of tubular electric heaters. The heating plates are attached to the press plates through heat-insulating spacers to reduce heat transfer to the press. In stationary molds, heating plates are attached to the bottom of the die and to the top of the punch.
Recently, induction heating of molds with electric current of industrial frequency has become widespread. With induction heating, energy consumption is reduced, the heating time of the mold is reduced, and the service life of electric heaters is increased.
For purchase heating plates for presses contact through the feedback form or by phone numbers indicated in the contacts.
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Form of payment, order of delivery, guarantee of heating plates:
- The sale is carried out on the basis of 50% prepayment when ordering plates for production and 100% prepayment if available in stock.
- Delivery is carried out by the transport companies of the Supplier or the Buyer by agreement, as well as by rail.
- Shipping costs for the delivery of goods are paid by the Buyer.
- Warranty for all new products is 12 months, for products after overhaul 6 months.
Please note that the information on this site is not a public offer.
Which is used to heat up metal parts of cars without harming neighboring parts.
Induction heater produces heat without the use of physical contact or fire. Does not require complete dismantling of non-heat resistant parts adjacent to the heated parts
The new induction heater is 50% more powerful than the previous CH33 version
With the help of the CH 37 induction heater, various types of work can be performed:
heating rusted bolts and nuts
heating of rusted door hinges
heating of steel and aluminum surfaces during the repair process
heating of rusted exhaust pipe flange bolts, in hard-to-reach places
heating of rusted suspension and steering bolts and nuts
easy removal of anti-corrosion coating and PVC filler.
Induction heater designed to heat all magnetic materials (thermally conductive) by concentrating the magnetic field at the end of the heater. But, the heater also works well with aluminum. The magnetic field oscillates at a frequency of approximately 55 kHz. The magnetic field creates an eddy current in the material, and the electrical resistance leads to heating of the metal.
CH 37 has an internal cooling system, water acts as a coolant. The circulating water cools the power electronics, cables, induction heater handle and the heater itself. As soon as the heater turns on, the water pump starts pumping cooling water into the heater.
Specifications:
- Supply voltage 208-240 V, 16 A, 1 phase
- Frequency: 50-60Hz
- Protection class: IP21
- Working cable length: 3m
- Cooling: water (20 l)
- Machine weight: 34 kg
Induction heater for a wide range of applications
In April 2008, the well-known Swedish company CAR-O-LINER officially introduced a new induction heater with increased power CH37. The new product is more powerful than the previous version of CH33 by as much as 50%!
The CH37 uses the most modern technology - compare: when using a gas burner for local heating, you are limited when working in close proximity to plastic and other heat-sensitive materials. The CH37 heater is also used to heat parts, but without an open flame (!!!) - surfaces are heated by high-frequency currents, which makes it possible to heat parts and surfaces even in the most inaccessible places.
This type of heater is designed to heat all magnetic materials (heat conductive) by concentrating the magnetic field at the end of the heater. However, the heater also works well with aluminum. The magnetic field oscillates at a frequency of approximately 55 kHz. The magnetic field creates an eddy current in the material, and the electrical resistance leads to heating of the metal.
CH 37 has an internal cooling system, water acts as a coolant. The circulating water cools the power electronics, cables, heater handle and the device itself. As soon as the induction heater turns on, the water pump starts pumping cooling water into it.
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The vulcanizing press is intended for the manufacture of rubber products by molding in compression molds. |
1. Nominal force: 8.0 (800) mN (tf) |
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The press is designed for molding and vulcanization of rubber and asbestos products. Technological parameters of the presses make it possible to use them not only for the production of rubber products, but also for products from various plastics and other molded materials. |
1. Nominal force: 2.5 (250) mN (tf) |
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The press is designed for molding and vulcanization of rubber and asbestos products. Technological parameters of the presses make it possible to use them not only for the production of rubber products, but also for products from various plastics and other molded materials. |
1. Nominal force: 2.5 (250) mN (tf) |
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The quality of plastic products is greatly influenced by the temperature at which they are manufactured. The temperature regime of the mold depends on the structure of the material being processed and on the characteristics of the technological process chosen to obtain this product.
So, when molding thermoplastics under pressure, the mold is cooled, when pressing thermosets, it is heated. Steam, gas and electric heaters are used to heat the molds. Steam and gas heaters are rarely used, as they are dangerous to operate and cumbersome. There are three types of mold heaters: resistance heaters, induction heaters, and semiconductor heaters.
The most widespread is electric heating, based on the use of resistance elements. The designs of resistance heaters are varied.
Rice, 126. :
a - electric heater for stationary molds; b - system of induction electric heating of the block for injection molding
Round heaters are used most often. One of the types of a round electric heater is shown in fig. 126, a. The heater body is a ceramic tube 1 enclosed in a protective metal shell 2. Inside there is a ceramic tube 3 of a smaller diameter, around which a nichrome spiral 4 is wound.
The space where the spiral is located is filled with quartz sand. This filler increases the thermal conductivity of the electric heater and extends its service life due to limited air access.
The placement of heaters in the mold depends on its design, i.e., on the height of the die, the location of the ejection and fasteners. It is desirable to locate the electric heater in the thickness of the mold at a distance of 30-50 mm from the shaping surface. At a closer location, local overheating is possible, which will lead to defective products.
The number of heaters in a mold is determined by its mass (or heat transfer surface area), operating temperature and heater power.
For heating removable molds, heating plates are used, in which channels are drilled for the location of tubular electric heaters. The heating plates are attached to the press plates through heat-insulating spacers to reduce heat transfer to the press. In stationary molds, heating plates are attached to the bottom of the die and to the top of the punch.
Recently, induction heating of molds by electric current of industrial frequency has become widespread. With induction heating, energy consumption is reduced, the heating time of the mold is reduced, and the service life of electric heaters is increased.
Inductors in the form of turns of copper wire of the PSDK brand with glass insulation are placed in grooves made in the heating plate or in the mold itself, around its shaping sockets. Inductors are usually filled with liquid glass or high-temperature silicon-based plastic.
In fig. 126, b shows a universal block for injection molding of thermosets.
Replaceable molds are installed on the plate 6. During installation, the mold is put on the protruding part of the loading chamber 8, made in the form of a pipe. For heating replaceable molds, an induction heating method is used. Inductors 7 are located in the grooves of plates 5 and 6.
The interaction of the block parts is similar to the stationary mold previously discussed in Fig. 121, a.
Induction heating
In early 2010, Gas Injection WorldWide, a partner of Japanese Injection Machines in gas / water / steam casting technologies, launched the world's first commercial launch of a new technology - external induction heating within the general RTC (Rapid Temperature Cycling) technology.
In issue 10-2009 of the magazine "Plastics" our company, which allows you to achieve high gloss by heating the mold before the moment of injection and while filling the cavity of the product. This technology is perfect for bulky or large flat products, giving them not only shine without staining, but also eliminating internal stresses and numerous defects inevitable during conventional casting.
RTC IHC technology - external induction heating is used for another group of products - small products with a maximum size of 30 x 30 x 3.0 cm (approximately the size of a 15-inch monitor), which have a small height, and are conventionally called "two-dimensional". The main advantages of the external induction heating technology:
- The technology can be used with existing molds
- The heating rate of the mold surface is about 4 times faster than using steam casting
External induction heating technology works in the following way:
- The mold opens;
- A robot enters the mold cavity from above to remove the previous product from the movable side of the mold, and at the same time, a heating device enters the mold cavity from below, which adjoins the stationary side of the mold (as a rule, the front surface is on the fixed side) at a distance of 3.0-5.0 mm from the surface of the mold;
- A heating device with a copper induction coil heats the mold cavity to a predetermined temperature, usually for 3 to 6 seconds, after which the mechanical device is lowered;
- The mold is closed and the normal injection molding cycle takes place.
With induction heating, a high frequency alternating current is passed through the copper induction coil. By means of a well-known electromagnetic phenomenon, the current in the induction coil induces an Eddy Current in the first 200 microns of the mold surface steel. The resistance to eddy current flow in steel creates very rapid heating of the mold surface. The shallow heating depth (200 microns) compared to injection molding with steam (8.0 mm) allows heating with significantly lower energy costs.
If you put your hand between the mold and the heating device, you will not feel any heat or temperature change, but if you put on the wedding ring, it will become very hot very quickly. Therefore, the advantage of induction heating technology is the lack of energy dissipation.
To implement this technology, you need:
- RTC IHC Control Controller
- Copper induction coil
- Feeding mechanical heating device
Panel made of glass-filled polycarbonate
Induction heating technology makes it easy to eliminate melt flow lines and seam lines, especially on products such as TV remote control or mobile phone case with buttons, camera or monitor case, various view panels in a car, when the melt diverges and converges many times. As with the use of steam casting technology, in addition to the gloss of the product (which is achieved without coloring), induction heating also has all the advantages of the RTC SWC technology:
- Eliminate visible cold junction lines and material flow
- High quality surface with very good gloss without staining even on standard materials
- Excellent flow of surface structure, especially in difficult areas (e.g. acoustic grilles on a TV cabinet)
- Smooth surface even with glass-filled materials
- Elimination of "silvering" on the front surface
- Improved surface optical properties - less distortion / more uniform refractive index
- It is possible to reduce the wall thickness (reduce the weight of the product and reduce the cycle time) and increase the length of the melt flow path, it is possible to reduce the holding and cooling time
- Reduced cycle times and significantly less power consumption compared to other RTC methods
At the same time, induction heating works well on small products, and, most importantly, their shape should be "two-dimensional", that is, the product does not have a large overall thickness (no more than 30 mm), and induction heating is used for the front surface. The technology not only improves the appearance of the product and allows you to achieve excellent gloss without expensive staining, but significantly reduces the number of rejects.
The limitation is due to the fact that after the start of the cycle, heating stops and the temperature of the mold drops. The second time it rises when the material is injected, and then falls again.
Another induction heating method is internal induction heating, where heating elements are embedded in a mold. This avoids a drop in temperature to a certain point, but there is a conflict between the heating zone and the cooling zone inside the mold, reducing efficiency and increasing energy consumption. In addition, unlike external induction heating, the mold must be modified, and the cost of license and patent royalties is quite high.
The third induction heating method uses the insertion of heating cartridges into the mold, like hot runners, but this technology has the disadvantages of the previous method, as well as less effect - visible seam lines remain despite the shine of the product, and hot runners tend to burn out after a few weeks.
The method of external infrared heating is similar to external induction heating. The same device once a cycle rises from the bottom into the cavity of the mold and produces heating, but with the help of infrared elements. Despite the similarity of technologies in practical results, there is a huge difference between them:
- Unlike the induction method, infrared heating also radiates heat into the air. This leads to heat dissipation and energy loss;
- The big disadvantage of the infrared heating method is that the energy is reflected from the polished surface of the mold, so the heating rate is very slow and the power consumption is high;
In general, to summarize, the infrared method uses radiated heat, while the induction method uses the electromagnetic effect. Therefore, the induction method provides heating much faster, while significantly less energy is spent.
The world's first customer for an external induction heating system produces an automotive part made of ABS / PC, which is then vacuum metallized. Since the negative effect of visible weld lines and melt flow paths has decreased several times, the amount of scrap compared to traditional injection molding after the metallization process has decreased several times. Using induction heating from Gas Injection WorldWide, post-metallization scrap was reduced to less than 2%. It is worth noting that the part is used by one of the main German car manufacturers, but its name is not subject to publication.
In the office of our company, you can watch a video of the production of this product with the process of external induction heating.
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