CN104275763B - A thermocompression molding system for foamed products - Google Patents

Abstract

The invention discloses a hot-press forming system of a foaming product, which comprises an upper die frame, a lower die frame, an upper die, a lower die and a cold-hot circulating system, wherein the upper die is arranged on the upper die frame, the lower die is arranged on the lower die frame, the upper die frame, the lower die frame, the upper die and the lower die are respectively provided with a heat transfer channel for circulating a heat transfer medium of the cold-hot circulating system, and the cold-hot circulating system respectively transfers heat with the upper die frame, the lower die frame, the upper die and the lower die in a specified time through at least three heat transfer media with different temperatures. The invention provides the cold-hot circulation to ensure the overall heating and cooling of the product, the heat transfer medium is utilized to realize the cold-hot transfer, the cost of equipment is saved, the stress generated on the die and the die carrier can be effectively reduced by the step heating and cooling, the service life of the die and the die carrier is prolonged, and the cost of enterprises is saved.

Description

A thermocompression molding system for foamed products

technical field

The invention belongs to the technical field of production equipment for foamed products, in particular to a thermal press molding system for foamed products.

Background technique

Thermoforming is a special plastic processing method for processing thermoplastic (see thermoplastic resin) sheets into various products. The sheet is clamped on the frame and heated to a softened state. Under the action of external force, it is pressed against the surface of the mold to obtain a shape similar to the surface. After cooling and shaping, it is trimmed and finished. Among them, the thermoforming of the mold is to place the heat-softened sheet between the paired female and male molds, and form it with the help of mechanical pressure. This method has a higher molding pressure and can be used to manufacture products with complex shapes, but the cost of the mold is higher.

The mold is a key part of the mold-to-die thermoforming technology, and the cold and hot forming technology is also particularly critical. The thermoforming equipment currently on the market does not handle the hot and cold forming in place, resulting in low quality products and frequent defective products. High; moreover, the cooling and heating equipment are set separately, and the separate equipment will inevitably lead to an increase in cost, which is not conducive to the cost control of the enterprise.

When the mold is installed on the mold base, due to the long-term hot and cold, it is easy to generate stress, which will cause the deformation of the mold or the mold base, resulting in the position of the mold cannot be stabilized, and there may be deviation, which will affect the production. damage the mold. During the heating and cooling process of the product, the installation position of the heater or cooler is unreasonable, which will easily lead to uneven heating or cooling, resulting in poor product quality.

Contents of the invention

The technical problem to be solved by the present invention is to provide a hot press molding system for foamed products in view of the above-mentioned deficiencies in the prior art, which provides a cold and hot cycle to ensure the overall heating and cooling of the product, and uses a heat transfer medium to realize the heating and cooling process. The transfer saves the cost of equipment, and the stepwise heating and cooling can effectively reduce the stress on the mold and formwork, prolong the life of the mold and formwork, and save the cost of the enterprise.

In order to solve the above technical problems, the technical solution adopted by the present invention is: a thermocompression molding system for foamed products, including an upper mold frame, a lower mold frame, an upper mold, a lower mold and a cooling and heating cycle system, the upper mold Installed on the upper mold frame, the lower mold is installed on the lower mold frame, the upper mold frame, the lower mold frame, the upper mold and the lower mold are all equipped with heat transfer channels for the circulation of the heat transfer medium of the cold and heat circulation system. In the hot channel, the cooling and heating circulation system conducts heat transfer with the upper mold frame, the lower mold frame, the upper mold and the lower mold at a specified time through at least three heat transfer media of different temperatures.

In the above technical solution, the lower mold frame is fixed on the fixed pallet, and the upper mold frame is fixed on the machine table; a heat insulation board is arranged between the lower mold frame and the fixed pallet, and the upper mold frame There is a heat shield between the machine and the machine.

In the above technical solution, the lower mold is fixed on the lower mold frame through a fixing device, and the upper mold is fixed on the upper mold frame through a fixing device; the fixing device includes a mounting seat, a T-shaped screw and a pressure handle, and the The mounting base is arranged on both sides of the upper mold base and the lower mold base, and the upper T-shaped slot opening upward and the lower T-shaped slot opening downward are arranged in the mounting base, and a T-shaped screw rod passes through the The lower T-shaped slot runs through the heat insulation board and the fixed support plate, and the mounting base is fixed on the heat insulation plate and the fixed support plate, and the other T-shaped screw is passed through the upper T-shaped slot and the fixed support plate. The pressure handle is connected, and the pressure handle is set on the flange protruding from both sides of the upper mold or the lower mold. By adjusting the upper and lower positions of the pressure handle, the tightness of the upper mold or the lower mold can be adjusted.

In the above technical solution, the fixed pallet is erected on two slide rails, so that the front and rear positions of the lower mold and the lower mold frame can be adjusted.

In the above technical solution, the upper mold is provided with two water inlets and two water outlets, the two water inlets are located in the middle of the upper mold, and the two water outlets are located on both sides of the upper mold; the lower mold is provided with two inlets A water outlet and a water outlet, the two water inlets are located on both sides of the lower die, and the water outlet is located in the middle of the lower die.

In the above technical solution, the upper mold frame is provided with an air duct for vacuuming by a vacuum pump, and a groove is provided on the surface of the upper mold frame in contact with the upper mold, and the top opening of the groove is in contact with the upper mold. The vacuum hole of the upper mold is communicated, the side opening of the groove is communicated with one end of the air duct, and the other end of the air duct is communicated with the vacuum pump; the lower mold base is provided with an air duct for the vacuum pump to evacuate , the position where the surface of the lower mold frame contacts the lower mold is provided with a groove, the top opening of the groove communicates with the vacuum hole of the lower mold, and the side opening of the groove communicates with one end of the air duct , the other end of the air pipeline communicates with a vacuum pump.

In the above technical solution, at least one sealing groove and sealing strip are arranged between the upper mold and the upper mold frame, and the sealing groove and the sealing strip are arranged around the groove; between the lower mold and the lower mold frame At least one sealing groove and sealing strip are provided, and the sealing groove and sealing strip are arranged around the groove.

In the above technical solution, the sealing groove is arranged on the surface of the upper mold frame, and the outer part of the sealing groove is concave; the sealing groove is arranged on the surface of the lower mold frame, and the outer part of the sealing groove Concave.

In the above technical solution, the upper die is a punch, and the heat transfer channel of the upper die flows through the punch; the lower die is a die, and the heat transfer channels of the lower die are located on both sides of the die. .

In the above technical solution, the cooling and heating cycle system includes a refrigerator, a frozen water tank, a water tower, a pipe rack, a normal temperature water tank, a medium temperature water tank and a high temperature water tank, the water tower is connected to the refrigerator, and the refrigerator is connected to the frozen water tank, The chilled water tank, the normal temperature water tank, the medium temperature water tank and the high temperature water tank are respectively communicated with the pipe rack through valves, and the pipe rack is communicated with the heat transfer channel.

The beneficial effects of the present invention are:

1) Provide cold and hot cycle to ensure the overall heating and cooling of the product, use heat transfer medium to realize the transfer of cold and heat to save equipment costs, stepwise heating and cooling can effectively reduce the stress on the mold and mold base, so that The life of the mold and formwork is extended, saving the cost of the enterprise.

2) Install heat shields to reduce heat loss on the mold and formwork, and ensure accurate control of the cold and heat treatment of the product.

3) The upper mold and the lower mold can be disassembled freely through the fixing device, which is convenient for replacing different molds.

4) Reasonably arrange the heat transfer channels flowing through the punch and die, so that the heat of the heat transfer medium can fully and evenly transfer heat to the raw material and the sheet, and improve the quality of the product.

5) Set a sealing groove and a sealing strip between the mold and the mold base, and set it around the vacuumed groove to ensure that after vacuuming, air will not enter again and ensure a normal molding environment.

6) Concave-convex settings are made on the surface of the mold base with the sealing groove as the boundary, and the outer part of the sealing groove is concaved. When the fixing device presses the mold on the mold base on the outside, the concave outside of the mold base and the mold A gap is left to make the fixing device lock the mold more firmly.

7) The cold and heat circulation system centrally processes cold and heat sources and stores them in different cold and heat source boxes for thermal insulation storage. This system can save the cost of the enterprise, and can provide good cold and heat treatment conditions for the production of manufactured products.

Description of drawings

Fig. 1 is the top view perspective structure schematic diagram of lower formwork of the present invention;

Fig. 2 is the sectional view of A-A' among Fig. 1;

Fig. 3 is an enlarged schematic diagram of part B in Fig. 1;

Fig. 4 is a top view perspective structure schematic diagram of the upper formwork of the present invention;

Fig. 5 is the sectional view of C-C' among Fig. 3;

Fig. 6 is a structural representation of the cooling and heating cycle system of the present invention;

Fig. 7 is a schematic diagram of the distribution of the heat transfer channels of the present invention.

In the figure: 1. Upper mold base; 2. Lower mold base; 3. Upper mold; 4. Lower mold; 5. Heat transfer channel; 6. Fixed supporting plate; Mounting seat; 10, T-shaped screw; 11, pressure handle; 12, flange; 13, groove; 14, air pipe; 15, sealing groove; 16, refrigerator; 17, frozen water tank; 18, water tower; 19, Pipe frame; 20, normal temperature water tank; 21, medium temperature water tank; 22, high temperature water tank; 23, water inlet; 24, water outlet.

Detailed ways

The present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figures 1 to 7, a thermocompression molding system for foamed products includes an upper mold frame 1, a lower mold frame 2, an upper mold 3, a lower mold 4 and a cooling and heating cycle system, and the upper mold 3 is installed On the upper mold base 1, the lower mold 4 is installed on the lower mold base 2, and the upper mold base 1, the lower mold base 2, the upper mold 3 and the lower mold 4 are all equipped with a heat transfer system for the cooling and heating cycle system. The heat transfer channel 5 through which the heat medium circulates. The cold and hot circulation system conducts heat transfer with the upper mold frame 1, the lower mold frame 2, the upper mold frame 3 and the lower mold frame 4 at a specified time through at least three heat transfer media of different temperatures. . The upper formwork 1 and the lower formwork 2 are made of aluminum. The at least three different temperatures include high temperature water, medium temperature water and low temperature water, and may also be cooling water. Preferably, a steam generator for real steam generation is also included.

Wherein, the lower mold frame 2 is fixed on the fixed pallet 6, and the upper mold frame 1 is fixed on the machine platform 7; a heat shield 8 is arranged between the lower mold frame 2 and the fixed pallet 6, so that A heat insulating board 8 is arranged between the upper formwork 1 and the machine platform 7 . The thermal insulation board 8 is arranged to reduce the heat loss on the mold and the formwork, so as to ensure accurate control of the cold and heat treatment of the product. The fixed supporting plate 6 is made of iron.

Wherein, the lower mold 4 is fixed on the lower mold frame 2 through a fixing device, and the upper mold 3 is fixed on the upper mold frame 1 through a fixing device; the fixing device includes a mounting base 9, a T-shaped screw 10 and a pressing handle 11. The mounting seat 9 is arranged on both sides of the upper mold frame 1 and the lower mold frame 2, and the mounting seat 9 is provided with an upper T-shaped slot opening upward and a lower T-shaped slot opening downward. The T-shaped screw 10 is passed through the lower T-shaped slot and passes through the heat insulating plate 8 and the fixed supporting plate 6, and the mounting seat 9 is fixed on the heat insulating plate 8 and the fixed supporting plate 6, and another The T-shaped screw 10 is threaded through the upper T-shaped groove and connected with the pressure handle 11, and the pressure handle 11 is pressed on the flange 12 protruding from the upper mold 3 or the lower mold 4 to both sides. Adjust the upper and lower positions of the pressing handle 11 so as to adjust the tightness of the upper die 3 or the lower die 4 . The mount 9 is made of iron. Both sides of the lower mold 4 and the upper mold 3 are respectively fixed by two fixing devices. The pressure handle 11 is in an arc shape, one end is pressed against the above-mentioned flange 12 , and one end is pressed against the mounting seat 9 , the middle part is provided with a screw hole and the above-mentioned T-shaped screw 10 is twisted.

Wherein, the fixed pallet 6 is erected on two slide rails, so that the front and rear positions of the lower mold 4 and the lower mold frame 2 can be adjusted. Before molding, the raw materials need to be packed in the mold cavity of the lower mold 4, so if the lower mold 4 is always under the upper mold 3, it will be troublesome to load the material, which is not conducive to the convenience of production. Lower mold 4 and lower mold frame 2 are arranged on the fixed pallet 6 that can move back and forth earlier.

Wherein, the upper mold 3 is provided with two water inlets 23 and two water outlets 24, the two water inlets 23 are located in the middle of the upper mold 3, and the two water outlets 24 are located on both sides of the upper mold 3; 4 is provided with two water inlets 23 and a water outlet 24, and the two water inlets 23 are located on both sides of the lower mold 4, and the water outlet 24 is located in the middle of the lower mold 4. Reasonably arrange the position of the heat transfer channel 5 so that the heat transfer medium in the heat transfer channel 5 can fully transfer heat and ensure the quality of the product.

Wherein, the upper mold frame 1 is provided with an air duct 14 for vacuuming by a vacuum pump, and a groove 13 is arranged on the surface of the upper mold frame 1 in contact with the upper mold 3, and the top opening of the groove 13 is It communicates with the vacuum hole of the upper mold 3, the side opening of the groove 13 communicates with one end of the air duct 14, and the other end of the air duct 14 communicates with the vacuum pump; The air duct 14 for vacuuming by the vacuum pump, the position where the surface of the lower mold base 2 contacts the lower mold 4 is provided with a groove 13, and the top opening of the groove 13 communicates with the vacuum hole of the lower mold 4, The side opening of the groove 13 communicates with one end of an air duct 14 , and the other end of the air duct 14 communicates with a vacuum pump.

Wherein, at least a sealing groove 15 and a sealing strip are arranged between the upper mold 3 and the upper mold frame 1, and the sealing groove 15 and the sealing strip surround the groove 13; the lower mold 4 and the lower mold At least one sealing groove 15 and a sealing strip are arranged between the frames 2 , and the sealing groove 15 and the sealing strip are arranged around the groove 13 . Ensure that after vacuuming, air will not enter again, ensuring a normal molding environment.

As shown in Figure 3, wherein, the sealing groove 15 is arranged on the surface of the upper mold frame 1, and the outer part of the sealing groove 15 is concave; the sealing groove 15 is arranged on the surface of the lower mold frame 2, And the outer part of the sealing groove 15 is concave. The surface of the formwork is provided with concavities and convexities bounded by the sealing groove 15, and the outer part of the sealing groove 15 is concavely set. When the fixing device presses the mold on the formwork on the outside, the concave outside of the formwork and the mold A gap is left to make the fixing device lock the mold more firmly.

Wherein, the upper die 3 is a punch, and the heat transfer channel 5 of the upper die 3 flows through the punch; the lower die 4 is a die, and the heat transfer channel 5 of the lower die 4 is located at the die on both sides. The heat transfer channels 5 located on both sides of the concave mold can be wavy or straight, or conform to the shape of the shoe mold.

As shown in Figure 6, wherein, described cold-heat circulation system comprises freezer 16, chilled water tank 17, water tower 18, pipeline frame 19, normal temperature water tank 20, medium temperature water tank 21 and high temperature water tank 22, described water tower 18 and freezer 16, the refrigerator 16 communicates with the chilled water tank 17, the chilled water tank 17, the normal temperature water tank 20, the medium temperature water tank 21 and the high temperature water tank 22 are all communicated with the pipe rack 19 through valves respectively, and the pipe rack 19 communicates with the The water inlet 23 of the heat transfer channel 5 communicates with the water outlet 24 .

The above embodiments are only intended to illustrate rather than limit the present invention, so all equivalent changes or modifications made according to the methods described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims (8)

1. A thermocompression molding system for foamed products, characterized in that: it comprises an upper mold frame, a lower mold frame, an upper mold, a lower mold and a cooling and heating cycle system, the upper mold is arranged on the upper mold frame, and the The lower mold is installed on the lower mold base, and the upper mold base, the lower mold base, the upper mold and the lower mold are all provided with a heat transfer channel for the heat transfer medium of the cold and hot cycle system to circulate, and the cold and heat cycle system passes through At least three heat transfer media with different temperatures conduct heat transfer with the upper mold frame, the lower mold frame, the upper mold and the lower mold respectively at a specified time; the lower mold frame is fixed on the fixed pallet, and the upper mold frame is fixed On the machine platform; a heat insulating plate is arranged between the lower mold frame and the fixed supporting plate, and a heat insulating plate is arranged between the upper mold frame and the machine platform; the lower mold is fixed on the lower mold frame by a fixing device Above, the upper mold is fixed on the upper mold base through a fixing device; the fixing device includes a mounting seat, a T-shaped screw and a pressure handle, and the mounting base is arranged on both sides of the upper mold base and the lower mold base. An upper T-slot opening upwards and a lower T-slot opening downwards are arranged in the mounting seat, and a T-screw is passed through the lower T-slot and passes through the heat shield and the fixing plate, and the The installation base is fixed on the heat insulation board and the fixed support plate, and the other T-shaped screw is penetrated through the upper T-shaped slot and connected with the pressing handle, and the pressing handle is pressed on the upper die Or the flange that the lower die protrudes to both sides, thereby adjusting the tightness of the upper die or the lower die by adjusting the up and down position of the pressure handle. 2. The hot press molding system for foamed products according to claim 1, characterized in that: the fixed pallet is erected on two slide rails, so that the front and rear positions of the lower mold and the lower mold frame can be adjusted . 3. A thermocompression molding system for foamed products according to claim 1, wherein the upper mold is provided with two water inlets and two water outlets, and the two water inlets are located in the middle of the upper mold, so that The two water outlets are located on both sides of the upper mold; the lower mold is provided with two water inlets and one water outlet, the two water inlets are located on both sides of the lower mold, and the water outlet is located in the middle of the lower mold. 4. A thermocompression molding system for foamed products according to claim 3, characterized in that: the upper mold base is provided with an air duct for vacuuming by a vacuum pump, and the surface of the upper mold base is in contact with the A groove is provided at the contact position of the upper mold, the top opening of the groove communicates with the vacuum hole of the upper mold, the side opening of the groove communicates with one end of the air duct, and the other end of the air duct communicates with the vacuum hole of the upper mold. The vacuum pump is connected; the lower mold frame is provided with an air pipeline for vacuuming by the vacuum pump, the position where the surface of the lower mold frame contacts the lower mold is provided with a groove, and the top opening of the groove is in contact with the lower mold The vacuum hole of the groove is communicated, the side opening of the groove is communicated with one end of the air pipeline, and the other end of the air pipeline is communicated with the vacuum pump. 5. A thermocompression molding system for foamed products according to claim 4, characterized in that: at least one sealing groove and sealing strip are arranged between the upper mold and the upper mold frame, and the sealing groove and sealing strip A strip is arranged around the groove; at least one sealing groove and a sealing strip are arranged between the lower mold and the lower mold frame, and the sealing groove and the sealing strip are arranged around the groove. 6. The thermocompression molding system for foamed products according to claim 5, characterized in that: the sealing groove is arranged on the surface of the upper mold frame, and the outer part of the sealing groove is concave; The sealing groove is arranged on the surface of the lower mold base, and the outer part of the sealing groove is concave. 7. A thermocompression molding system for foamed products according to claim 3, characterized in that: the upper mold is a punch, and the heat transfer channel of the upper mold flows through the punch; the lower mold It is a concave mold, and the heat transfer channels of the lower mold are located on both sides of the concave mold. 8. A hot press molding system for foamed products according to claim 1, characterized in that: the cold and hot circulation system includes a refrigerator, a frozen water tank, a water tower, a pipe rack, a normal temperature water tank, a medium temperature water tank and a high temperature water tank. The water tank, the water tower communicates with the refrigerating machine, the refrigerating machine communicates with the chilled water tank, the chilled water tank, the normal temperature water tank, the medium temperature water tank and the high temperature water tank are respectively communicated with the pipe frame through valves, and the pipe frame is connected with the The heat transfer channel is connected.