Mold with fast heating and cooling. Vacuum press and press sections MPP Lauffer for the production of printed circuit boards Press with heating

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Press structure:
Press series PL is a welded steel structure made of beams, which provides greater strength, rigidity and reliability of the equipment.
The fixed and movable plate is also a welded steel structure.
The press is equipped with a rack-pinion system, which allows the plates to be parallel when lifting and lowering.
All perimeter presses are equipped with an emergency safety cord. Thanks to this system, it is possible to stop or block the movable plate on either side of the press.
All flat surfaces of the press were processed on CNC metalworking machines, which made it possible to ensure high accuracy of the press assembly.

Hot press plate types PL:

1. Prefabricated plate
Max. temperature 110 ° C, max working pressure 3-4 kg / cm2, coolant pressure 0.5 atm.
Consists of:
A. Aluminum coating for best quality surface and better thermal conductivity.
B. Flat steel sheet.
C. Heating medium coil, water / oil, welded from rectangular pipes
D. Coil reinforcement.
E. Flat steel sheet, for intermediate plate only
F. Insulation material.

2.Milled steel plates
Max heating temperature 150 ° C.
Surface pressure up to 10 kg / cm2

3. Perforated cast steel plate
Max. temperature 250 ° C, max working pressure 30-80 kg / cm2, coolant pressure 10 atm.
Consists of a single steel plate with drilled holes for the circulation of the heating medium.
The pressing surface is normally flat and on request can be coated with aluminum or heat-resistant nylon (milar); a primed and polished surface is possible for special purposes.

4. Electric stove
Max. temperature 120 ° C, max working pressure 5 kg / cm2.
Consists of a 9mm aluminum plate into which heating elements are inserted; at the bottom is a base plate with reinforced pipes inside.

Heating plates:
Water boiler, maximum heating temperature 100 С
Oil boiler, maximum heating temperature 120 С
Electric heating plates, heating elements, maximum heating temperature 120 С
An insulating sheet is placed between the press body and the heating plates.

Hydraulic system:

• All cylinders of the press are chrome-plated, which provides smooth lifting / lowering and longer life of the oil seals and pistons.
• The hydraulic system is complemented by a 2-level oil pump for good sound insulation and better lubrication of rotating parts.
• Hydraulic pump for quick opening / closing of the press (high pressure 38 l / min), pump of the working cycle (low pressure 2.3 l / min)
• central hydraulic unit, equipped with the following mechanical safety valves mounted on the oil tank:

1. safety valve closing, it is conducive to energy saving and prevents oil overheating.
2. overpressure safety valve, it helps to avoid the situation where too high pressure occurs in the hydraulic system in the event of an electrical and / or electronic circuit.
3. reverse pressure maintenance (holding valve)
4. pressure release valve (pre-release valve).
5. large oil release control magnet.

Control Panel:
All press functions are controlled from the main panel. All presses are equipped with an automatic pressure recovery device. This device allows you to maintain a constant set pressure in the press.
All presses are equipped with an opening timer for automatic plate opening. The operator can set or change any parameters from the control panel. The press plates are closed by pressing two buttons at the same time, which guarantees the safety of the operator.

Specifications:
- Slab dimensions 2500 x 1300 mm
- 4 cylinders with a diameter of ø 70 mm
- Stroke 400 mm
- press opening 400 mm
- total pressure 70 tons
- special pressure on 100% of the slab surface 1.5 kg / cm2.
- loading / unloading on both sides 2500 mm
- press opening timer
- safety cord around the entire press
- overall dimensions of the press 3200x1600x1800 mm
- the total weight of the press is about 3000 kg
- CE standards

Options:
Increase in piston stroke up to 650 mm instead of 400 mm
Press control panel LOGIC CONTROL
Manual shutdown of a pair of pistons
Electrical disconnection of a pair of pistons
Collapsible press design
Parallelism control along the perimeter of the press
Increase in heating power
Timer pre-heating system
The press is delivered without a heating system

Control panel LODIC CONTROL (PLC):
The main control panel is equipped with a color touch screen digital monitor for quick setup:
temperature indicator, controls the heating temperature of the plates.
pressure force control sensor with automatic system pressure recovery.
main on / off button.
indicator light on / off.
systems for daily regulation of heating temperature - new system switching on and off heating depending on the heating temperature of the press.

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. Temperature regime mold depends on the structure of the processed material and characteristics technological process selected to receive 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. Heat-resistant wire, laid in a metal hose, safely connects the plates to the cabinet.

Heating plates for hydraulic press P, PB

For heating removable molds, use heating plates, in which channels are drilled for the location of tubular electric heaters. 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.

V Lately induction heating of molds by electric current of industrial frequency is becoming 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 the press contact through the form feedback 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 transport companies Supplier or 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 12 months, for products after overhaul 6 months

Please note that the information on this site is not a public offer.

The invention relates to a mold containing a first part, including a housing (111), to which a molding zone (112) is connected to form a mechanical interface (115) between said molding zone and the housing, and containing inductors (132) located in the so-called longitudinal direction in the cavities (131) between the said interface (115) and the forming zone (112), and a cooling device (140) located at the interface between the forming zone and the body. The invention makes it possible to eliminate temperature gradients that lead to deformation of the mold. 14 p.p. f-ly, 6 dwg

The invention relates to a mold with rapid heating and cooling. In particular, the invention relates to a device for induction heating and rapid cooling of a mold intended for injection molding of a plastic material or metal in a liquid or pasty state.

The document EP 1894442, filed in the name of the applicant, describes a mold equipped with an induction heating device and a cooling device by circulating a heat transfer fluid. This known device contains a mold consisting of a stationary part and a movable part. Each of the parts is configured to accommodate an induction heating circuit and a cooling circuit. Each of these parts contains a body to which a part is connected, forming a molding surface that gives the final shape to the part cast in this mold. For each part of the mold, the forming surface is a heated and cooled surface, and the specified surface is in contact with the material of the molded part. Inductors are installed in the cavities under the said molding surface. Most often, these cavities are made by cutting grooves on the underside of said molding zone at the interface between this zone and the mold body. The cooling circuit is made in the form of channels drilled in the body and farther from the forming surface. This cooling circuit simultaneously provides cooling of this housing, which in a common embodiment is made of a material that is not sensitive to induction heating, and cooling of the forming surface. Finally, the body of each part is mechanically connected to the stand.

This configuration gives good results, but is difficult to use when the mold is large or when the mold surface is complex. Under these conditions, temperature gradients, which appear during both heating and cooling, lead to deformation of the mold as a whole, on the one hand, and, in particular, to differential deformation between the molding zone and the body, and this differential deformation leads to poor contact between these two elements and degrades the quality of cooling, creating thermal barriers between these two elements.

The object of the invention is to eliminate the above disadvantages inherent in the known technical solutions by creating a mold containing a first part, including a body, to which the forming zone is connected, forming a mechanical interface between the said forming zone and the body, and containing inductors, located in the so-called longitudinal direction in the cavities between the said interface and the molding zone, and a cooling device located at the interface between the molding zone and the body. Thus, since the heating and cooling devices are located as close to the interface as possible, differential deformations do not affect the thermal conductivity between the heating and cooling devices and the forming zone. The inductors can be easily installed in shallow grooves that form cavities after the molding zone is connected to the body, thereby reducing the cost of machining such a mold.

Preferably, the invention is carried out in accordance with the embodiments described below, which are to be considered separately or in any technically feasible combination.

Preferably, according to an exemplary embodiment, the claimed mold comprises, at the interface between the body and the forming zone, a tape made of a thermally conductive material and adapted to compensate for differences in shape between the forming zone and the body.

According to a particular embodiment, the tape is made of graphite.

According to a version of this embodiment, said tape is made of Ni nickel.

According to another version of this embodiment, said tape is made of copper Cu.

Preferably, said tape is soldered onto the forming zone.

According to a second embodiment, compatible with the first, the inductors are inserted into sealed enclosures that can withstand temperatures of at least 250 ° C, and the cooling device comprises a heat transfer fluid flowing in cavities around the inductors.

According to a third embodiment, the cooling device uses the circulation of a dielectric fluid in the cavities around the inductors.

Preferably, the dielectric fluid is an electrical insulating oil.

According to a fourth embodiment, the cooling device comprises a cavity filled with a fluid that can change phase under the influence of temperature, and whose latent phase transition heat is sufficient to absorb the heat of the forming zone at a certain temperature.

According to a fifth embodiment, the cooling device allows gas to be pumped into the cavities around the inductors.

Preferably, the gas is injected in the transverse direction relative to the longitudinal direction. Thus, a vortex is formed in the air stream, which promotes heat exchanges. This swirl depends on the gas discharge pressure and on the angle between the discharge channel and the longitudinal direction of the cavities.

Preferably, according to this last embodiment, the cooling device of the claimed mold comprises a plurality of gas injection points along the length of the cavity in the longitudinal direction.

Preferably, the gas is air injected at a pressure exceeding 80 bar. The use of air as a cooling fluid simplifies the use of the device, in particular with regard to sealing problems.

According to a particular embodiment, the claimed mold comprises a second induction loop spaced from the first one relative to the interface and supplied with current by means of a separate generator.

According to a preferred embodiment, the body and the molding zone are made of an INVAR type iron Fe and Ni nickel alloy, the Curie point of which is close to the transformation temperature of the material being cast. Thus, if the material of the body and the forming zone is ferromagnetic, that is, sensitive to induction heating, it has a low coefficient of expansion. When, when heating the material, its temperature approaches the Curie point, it becomes insensitive to induction heating. Thus, this embodiment makes it possible to control the differential expansion of the body and the forming zone, as well as between the body and the mechanical support of the said body on the press.

FIG. 1 shows a general example of implementation of the claimed mold, cross-sectional view;

in fig. 2 is a cross-sectional view of a claimed mold according to an embodiment comprising a belt between the forming zone and the body;

in fig. 3 shows a first part of a mold according to an embodiment of the invention, where the cooling device comprises a cavity filled with a material that can change phase at a given temperature, absorbing the latent heat of a phase transition, a cross-sectional view;

in fig. 4 shows a part of the claimed mold according to an embodiment of the invention, in which the cooling occurs due to the circulation of the heat transfer fluid in the cavities in which the inductors are located, a cross-sectional view;

in fig. 5 shows an example of an embodiment of a part of the claimed mold containing a cooling device by transverse injection of gas under pressure in the cavities in which the inductors are located, a cross-sectional view, while the orientation of the injectors in a longitudinal section is shown in the section plane SS;

in fig. 6 shows an example of an embodiment of a part of the claimed mold containing two spaced apart and separate induction circuits, a cross-sectional view.

As shown in FIG. 1, according to a first embodiment, the claimed mold comprises a first portion 101 and a second portion 102. The following description will refer to the first portion 101. One skilled in the art can easily apply the embodiments described for this first portion 101 to a second portion of said mold ... According to this embodiment, the first part 101 is fixed on a mechanical support 120. Said first part of the mold comprises a body 111, which is fixed on this mechanical support 12, and at its distal end with respect to said support 120 comprises a forming zone 112 connected to said body 111 using a mechanical attachment (not shown). Thus, there is a mechanical interface 115 between the body and the forming zone. The mold comprises a heating device including inductors 132 disposed in cavities 131 at the interface 115 between the forming zone 112 and the body 111, in this embodiment, said cavities made by cutting grooves on the inner side of the molding zone. The cooling device 140, shown here schematically, is also located at the interface 115.

As shown in FIG. 2, according to an exemplary embodiment, the claimed mold comprises a belt 215 between the interface 115 and the cooling device. This tape is made of graphite, nickel Ni or copper Cu, is thermally conductive and can compensate for shape differences between the forming zone 112 and the body 111 at the interface 115 to ensure uniform contact between the body and the forming zone, as well as to provide good thermal conductivity between them. ... The belt material is selected depending on the temperature reached during forming. Preferably, the tape is brazed at the interface between the molding zone and the body after the mold is closed using a mold heating device for brazing. Thus, the shape adaptation is ideal.

As shown in FIG. 3, according to another embodiment, the cooling device comprises a cavity 341, 342, which is filled with a material capable of changing the phase at a certain temperature, and this phase change is accompanied by the absorption of excess latent heat. Phase change is melting or evaporation. The specified material is, for example, water.

As shown in FIG. 4, according to another embodiment of the inventive mold, each inductor 132 is enclosed in a heat-resistant hermetically sealed envelope 431. Depending on the temperature to be created by the inductors, such envelope 431 is made of glass or silica, and it preferably has a closed porosity so that at the same time be sealed and withstand thermal shock when cooled. If the temperature reached by the inductors during operation is limited, for example, for molding some plastic materials, the specified shell is made of a heat-shrinkable polymer, for example, of polytetrafluoroethylene (PTFE or Teflon®) for operating temperatures of the inductors up to 260 ° C. Thus, the cooling device provides for the circulation of a heat-transfer fluid, for example water, in the cavities 131 in which the inductors are located, while these inductors are isolated from contact with the heat-transfer fluid by their sealed envelope.

Alternatively, the heat transfer fluid is a dielectric fluid, such as a dielectric oil. This type of product is marketed in particular for cooling transformers. In this case, there is no need for electrical insulation of the inductors 132.

As shown in FIG. 5, according to another embodiment, the cooling is carried out by injecting gas into the cavity 131 in which the inductors 132 are installed. To increase the cooling efficiency, the gas is injected at a pressure of about 80 bar (80⋅10 5 Pa) through several channels 541 uniformly distributed in the longitudinal direction along the inductors 132. Thus, injection is carried out at several points along the inductors through the injection channels 542 transversely to said inductors 132.

In the longitudinal section along the SS, the injection channel 542 is oriented so that the direction of the fluid jet in the inductor cavity has a component parallel to the longitudinal direction. Thus, by appropriately selecting the injection angle, efficient cooling is obtained by swirling the gas along the inductor 132.

Temperature gradients, particularly in a housing mounted on a mechanical stand, can lead to warpage of the device or differential strain stresses. Therefore, according to a preferred embodiment, the body 111 and the forming zone 112 are made of an alloy of iron and nickel containing 64% iron and 36% nickel, called INVAR, and having a low coefficient of thermal expansion at a temperature below the Curie temperature of this material when it is in a ferromagnetic state. , that is, it is sensitive to induction heating.

As shown in FIG. 2, according to a last embodiment compatible with previous embodiments, the mold comprises a second row 632 of inductors spaced apart from the first row. The first 132 and second 632 rows of inductors are connected to two different generators. In this way, heat is dynamically distributed between the two rows of inductors in order to limit the deformations of the parts of the mold caused by thermal expansion in combination with thermal gradients that appear during the heating and cooling phase.

1. A mold containing a first part, including a body (111), to which the forming zone (112) is connected to form a mechanical interface (115) between said forming zone and the body, and containing inductors (132) located in the so-called longitudinal direction in the cavities (131) between the said interface (115) and the forming zone (112), and a cooling device (140) located at the interface between the forming zone and the body.

2. A mold according to claim 1, characterized in that it contains, at the interface between the body and the forming zone, a tape (215) made of a heat-conducting material and configured to compensate for differences in shape between the forming zone (112) and the body (111) ...

3. A mold according to claim 2, characterized in that the strip (215) is made of graphite.

4. A mold according to claim 2, characterized in that the strip (215) is made of nickel (Ni) or a nickel alloy.

5. A mold according to claim 2, characterized in that the tape (215) is made of copper (Cu).

6. A mold according to claim 1, characterized in that the inductors (132) are inserted into hermetic shells (431), made with the ability to withstand a temperature of at least 250 ° C, while the cooling device contains a liquid heat carrier flowing in the cavities ( 131) around the inductors (132).

7. A mold according to claim 1, characterized in that the cooling device (140) is configured to circulate a dielectric fluid in the cavities (131) around the inductors (132).

8. A mold according to claim. 7, characterized in that the dielectric fluid is an electrical insulating oil.

9. A mold according to claim 1, characterized in that the cooling device comprises a cavity (341, 342) filled with a fluid, capable of changing the phase under the influence of temperature, and the latent heat of the phase transition of which is sufficient to absorb the heat of the molding zone (112) at a certain temperature.

10. A mold according to claim 1, characterized in that the cooling device comprises a device (541, 542) for injecting gas into the cavity (131) around the inductors (132).

11. A mold according to claim 10, characterized in that the gas is injected by means of injectors (542) located in the transverse direction relative to the longitudinal direction.

12. A mold according to claim 11, characterized in that it contains several injectors (542) for injecting gas along the length of the cavity (131) in the longitudinal direction.

13. A mold according to claim 10, characterized in that the gas is air, injected at a pressure exceeding 80 bar (80⋅10 5 Pa).

14. A mold according to claim 1, characterized in that it contains a second induction loop (632) spaced from the first (132) induction loop relative to the interface (115) and supplied with current by means of a separate generator.

15. A mold according to claim 1, characterized in that the body (111) and the forming zone (112) are made of an INVAR-type iron-nickel alloy.

The invention relates to mechanical engineering, in particular to the heat treatment of parts, and can be used for the manufacture of inductors for devices for high-frequency hardening of products widely used in various industries National economy.

The invention relates to a mold containing a first part, including a body, to which the forming zone is connected to form a mechanical interface between said forming zone and the body, and containing inductors located in the so-called longitudinal direction in cavities between said interface and a molding zone, and a cooling device located at the interface between the molding zone and the body. The invention makes it possible to eliminate temperature gradients that lead to deformation of the mold. 14 p.p. f-ly, 6 dwg

the process of reaching and maintaining a predetermined temperature of the forming element (mold). To heat the molds are used cartridge heating elements and flat heaters... The type of heater is selected based on the shape of the available surface for heating (cylindrical hole - cartridge heating element, flat section - respectively flat heater).

Molds are commonly used to create batches of standard products. Heating of injection molds is carried out using various heating elements, but the most common are electric resistance heaters.

Mold Heaters are located depending on its design features, including the height of the matrix and the internal structure. It is recommended to place the heater in the mold body at a distance of 30-50 mm from the inner wall. Placing closer to the inner wall than the recommended distance increases the risk of manufacturing rejects.

The calculation of the number of required heaters for heating the mold is based on the following data: the mass of the mold (or the surface area of ​​the heat transfer), working temperature and the power of the heating element.
Removable molds for casting are heated using heating plates containing cartridge heating elements.

Cartridge heating elements for heating molds

Cartridge heating elements for heating molds- heating elements that carry out heating in cylindrical openings. These are contact heaters, therefore, they require close contact with the heated surface. The voids are filling assembly paste.

Coil heaters for heating molds

Coil heaters for heating molds- these are heaters that have a high specific power with relatively small overall dimensions.

Flat heaters for heating molds

Flat heaters for heating molds- electric resistance heaters with a flat surface, which maintain a given melt temperature during casting. During the production of the heater, it is possible to make holes in it of the required size in accordance with the design of the injection mold. Requires a tight fit to the mold when heated.