MXPA99011208A - Method and apparatus for supplying an optimised quantity of catalyst to a core shooting machine - Google Patents
Method and apparatus for supplying an optimised quantity of catalyst to a core shooting machineInfo
- Publication number
- MXPA99011208A MXPA99011208A MXPA/A/1999/011208A MX9911208A MXPA99011208A MX PA99011208 A MXPA99011208 A MX PA99011208A MX 9911208 A MX9911208 A MX 9911208A MX PA99011208 A MXPA99011208 A MX PA99011208A
- Authority
- MX
- Mexico
- Prior art keywords
- catalyst
- purge gas
- firing machine
- pressure
- core
- Prior art date
Links
- 239000003054 catalyst Substances 0.000 title claims description 74
- 238000010304 firing Methods 0.000 claims description 37
- 238000010926 purge Methods 0.000 claims description 34
- 238000004519 manufacturing process Methods 0.000 claims description 12
- GETQZCLCWQTVFV-UHFFFAOYSA-N Trimethylamine Chemical group CN(C)C GETQZCLCWQTVFV-UHFFFAOYSA-N 0.000 claims description 11
- 239000007788 liquid Substances 0.000 claims description 10
- 239000000203 mixture Substances 0.000 claims description 10
- 230000001105 regulatory Effects 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 238000005266 casting Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 2
- 241001367079 Una Species 0.000 abstract 4
- KJFMBFZCATUALV-UHFFFAOYSA-N Phenolphthalein Chemical compound C1=CC(O)=CC=C1C1(C=2C=CC(O)=CC=2)C2=CC=CC=C2C(=O)O1 KJFMBFZCATUALV-UHFFFAOYSA-N 0.000 abstract 3
- 239000007789 gas Substances 0.000 description 30
- 150000001412 amines Chemical class 0.000 description 5
- 150000003512 tertiary amines Chemical class 0.000 description 5
- IQPQWNKOIGAROB-UHFFFAOYSA-N [N-]=C=O Chemical compound [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 3
- 210000004940 Nucleus Anatomy 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- MHDVGSVTJDSBDK-UHFFFAOYSA-N dibenzyl ether Chemical compound C=1C=CC=CC=1COCC1=CC=CC=C1 MHDVGSVTJDSBDK-UHFFFAOYSA-N 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 229920002635 polyurethane Polymers 0.000 description 2
- 239000004814 polyurethane Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- ZMANZCXQSJIPKH-UHFFFAOYSA-N triethylamine Chemical compound CCN(CC)CC ZMANZCXQSJIPKH-UHFFFAOYSA-N 0.000 description 2
- -1 trimethylamine) Chemical class 0.000 description 2
- TZIHFWKZFHZASV-UHFFFAOYSA-N Methyl formate Chemical compound COC=O TZIHFWKZFHZASV-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 230000003197 catalytic Effects 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000003247 decreasing Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- JOYRKODLDBILNP-UHFFFAOYSA-N ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 230000035876 healing Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920005862 polyol Polymers 0.000 description 1
- 150000003077 polyols Chemical class 0.000 description 1
- 230000002035 prolonged Effects 0.000 description 1
- 229920003987 resole Polymers 0.000 description 1
- 230000035943 smell Effects 0.000 description 1
- 230000001131 transforming Effects 0.000 description 1
Abstract
En un método y aparato para el suministro de una cantidad optimizada de catalizador a una máquina de disparo de núcleos para la fabricación de núcleos o moldes para procesos de fundición, en donde el catalizador se extrae de un recipiente presionizado (11) en forma líquida o gaseosa y se mezcla con un gas de purga antes de que se introduzca en la máquina de disparo de núcleos, primero, una cantidad optimizada del catalizador y segundo, el gas de purga a una presión de 0.1 a 10 bar, se alimentan hacia el envase de presión (15), el catalizador y el gas de purga se mezclan en el envase de presión (15) y la mezcla resultante se introduce en la máquina de disparo de núcleos. Cuando el catalizador se usa en forma líquida, se puede transformar de forma líquida a forma gaseosa en el fuelle de suministro regulado (20) colocado entre y conectado con el recipiente presionizado (11) y el envase de presión (15).
Description
"METHOD AND APPARATUS FOR SUPPLYING AN OPTIMIZED AMOUNT OF CATALYST TO A NUCLEUS SHOOTING MACHINE"
This invention relates to a method and apparatus for supplying an optimized amount of catalyst to a core firing machine for the manufacture of cores and molds for casting processes wherein the catalyst is extracted from a pressurized vessel in liquid form or gas and mixed with a purge gas before it is introduced into the core firing machine. Methods for the manufacture of cores for casting processes are known. The application of amines as catalysts for the manufacture of cores in accordance with the Cold Box Process of urethane is described in the special issue of Giesserei 78 (1991), volume 11, pages 372 to 374. In this known method for production of cores and molds, a molding material containing a benzyl ether resin (ortho-phenol resole) and an isocyanate which is cured with a tertiary amine catalyst is used. Since the catalytic effect of the amine is particularly advantageous in the gas phase, tests were carried out using trimethylamine (TMA) whose boiling temperature is about 3 ° C and with which, due to this reason, it is possible to the healing of one -
relatively simple way with a gaseous amine. The accelerating effect of a tertiary amine by the formation of reactive transition compounds during the polyurethane reaction is described by the following reaction equation:
Isocyanate, -R-N = C-0 < - > + OH-R'-OH -R-N (H) -C = 0 + N (CH 3) 3 OR'-OH N (+ KCH 3) 3 Polyol Polyurethane
When cores are manufactured by this known method, it is disadvantageous that the tertiary amine is fed to the core firing machine considerably in excess of the required amount. Although it has been shown that the application of trimethylamine makes it possible to advantageously reduce the amount of amine used by about 50 percent compared to the other amines, the application of trimethylamine still has associated disadvantages. One problem is the extreme annoyance created by the smell that makes it essential that all parts of the used equipment be absolutely escape-proof. All piping must, therefore, be isolated at a relatively high cost.
A method for making cores for casting processes is described in Patent Number DE 19706472.8 in which, the gaseous trimethylamine is conducted through the pieces of a regular supply device and then, at a concentration of 0.01 percent by weight. 0.12 percent by weight based on the amount of sand used per core, is conducted to the core firing machine and brought into contact with the sand. In accordance with a preferred embodiment of this method, it is envisioned that the gaseous trimethylamine is exposed to a purge gas. In general, according to the method described in Patent Number DE 19706472.8, it is visualized by taking the trimethylamine from a pressurized container and conveying it to the core firing machine by means of a conduit. A connector is placed in the conduit for the purge gas which in this way is brought into contact in the catalyst. However, it is disadvantageous when using this method that the amount of catalyst that is conducted to the core firing machine decreases as a result of a decrease in pressure in the pressurized vessel. Therefore, addition of and / or adjustment for an optimized amount of catalyst is not possible. Likewise, it is disadvantageous that the pressure at which the mixture of the catalyst and the purge gas is conducted towards the core firing machine is relatively low, and -
that it is not possible to carry out the mixing of catalyst and purge gas through the core firing machine at the desired speed. The object of the invention is therefore to provide a method and an apparatus for adding an optimized amount of catalyst to a core firing machine for the production of cores or molds for casting processes in which it is ensured that the firing machine of nuclei is exposed to the optimized amount of catalyst in the shortest time possible. In accordance with the invention, a method is provided for the supply of an optimized amount of catalyst to a core firing machine for the manufacture of cores or molds, for melting processes wherein a catalyst is extracted from a pressurized vessel (1) in liquid form or gaseous, and mixed with a purge gas before it is introduced into the core firing machine, characterized in that first, an optimized quantity of the catalyst and secondly the purge gas at a pressure of 0.1 to 10 bar they are fed to a pressure vessel (15), the catalyst and the purge gas are mixed in the pressure vessel (15) and the resulting mixture is introduced into the core firing machine.
-
As used herein, the term "core firing machine" will be understood to include devices or apparatus used in foundries for the manufacture of molds for casting processes. The catalyst, for example, can be a tertiary amine (such as trimethylamine), methyl formate, sulfur dioxide or carbon dioxide. The method is particularly useful for producing cores or molds using a benzyl ether resin and an isocyanate and a tertiary amine such as triethylamine, as the catalyst. A gas bottle may be used, for example, as the pressurized vessel containing the catalyst. Air is usually used as the purge gas, but other gases can be used, for example, carbon dioxide. The supply of the purge gas to the pressure vessel from 0.1 to 10 bar makes it possible to adjust the pressure in the pressure vessel within the range of 0.1 to 10 bar. Advantageously, the catalyst supply is carried out through a valve. The optimized amount of the catalyst depends on the size of the core or mold that is being produced and is determined in advance on the basis of the different parameters for a specific core or mold. Surprisingly it has been shown that the process of supplying an optimized amount of catalyst to a core firing machine according to the invention is possible in an advantageous manner, by carrying out the optimized quantity of the catalyst through the firing machine. cores in an optimized time. The ratio between the amount of the catalyst on the one hand, and the amount of purge gas on the other hand, which is adjusted between 1: 1000 and 1: 10000 can be kept constant, while the mixture of the two is being flowed to through the core firing machine. In this way, disadvantageous variations in pressure can be avoided. The optimized time is the shortest time that is necessary for the mixture to flow completely through the core firing machine, and is regulated by means of the pressure in the pressure vessel. In a preferred embodiment of the method of the invention, the catalyst in gaseous form is heated in a pressurized vessel at a temperature of 3 ° C to 80 ° C to facilitate contact between the catalyst and the purge gas. In accordance with another preferred embodiment of the method of the invention, the catalyst is conducted to a regulated supply bellows in liquid form before being fed in gaseous form to the pressure vessel. The use of the regulated supply bellows is advantageous because even when the heat is extracted from the surrounding environment during the transformation of the catalyst from the liquid to the gaseous form, the regulated supply bellows remains able to continue operating through periods of operation. prolonged, when compared 'with other transport equipment. It is particularly advantageous that the regulated supply bellows can be installed in a relatively simple manner because the old core or mold production plants can be adapted to the use of this embodiment of the method of the invention. According to a further preferred embodiment of the method of the invention, trimethylamine is used as the catalyst and it is advantageous that when trimethylamine is used, the amount of the catalyst can be kept relatively small due to the discomfort of the odor, when this can be largely avoided when the cores are stored subsequently before use. In accordance with a further preferred embodiment of the method of the invention, after the mixture of the catalyst and the purge gas have been introduced from the pressure vessel to the core firing machine, additional purge gas is fed into the core firing machine through the pressure vessel. This measure has the additional advantage that it results in the purge of the core firing machine and the core or mold appreciably reduces any discomfort due to the odor of the catalyst. In accordance with a further feature of the invention, an apparatus for supplying an optimized amount of catalyst to a core firing machine for the manufacture of cores or a mold for melting processes comprising a pressurized container (11) for containing the catalyst, a medium (12) is provided. ) to determine the amount of catalyst in the pressurized container, means (14) for carrying the catalyst to a conduit (19) for supplying a catalyst to a core firing machine and a means (16, 17) for supplying a purge gas to the apparatus, characterized in that the apparatus also has a pressure vessel (15) positioned between and connected to the pressurized vessel (11) and the supply conduit (19), and the purge gas supply means ( 16) is connected to the pressure vessel (15). If desired, the apparatus may also have a heater for heating the catalyst in the pressurized container. This apparatus is suitable for use when the catalyst in the pressurized container is in gaseous form. When the catalyst in the pressurized container is in liquid form, the apparatus can have -
a regulated supply bellows placed between the pressurized container and the pressure container so that the catalyst can be transformed into a gaseous form before being fed into the pressure vessel. The invention is illustrated in the accompanying drawings in which: Figure 1 shows schematically an apparatus used to produce mold cores by a known method in which the catalyst is exposed to purge air, Figure 2 schematically shows the apparatus according to the invention for supplying an optimized amount of catalyst to a cores firing machine using the method of the invention, and Figure 3 shows an apparatus schematically according to the invention for supplying an optimized amount of catalyst to a coke firing cores using the method of the invention, wherein the catalyst is used in liquid form. With reference to Figure 1, a catalyst is contained in a pressurized container (1) which can be a simple gas bottle, and the pressurized container (1) is placed on the scales (2) in order to determine its content. The pressurized container (1) can be heated by means of a heater (3). In the production of a core or mold, the catalyst is conducted through a valve (4) to the supply conduit (5), which opens directly to the core firing machine (not shown). A purge gas is introduced directly into the supply conduit (5) through the conduit (6). With the decreased pressure in the pressurized container (1), the amount of the catalyst that reaches the supply conduit (5) is reduced. In addition, in order to prevent the purge gas from being introduced into the pressurized container (1) through the open valve (4), the selected pressure in the conduit (6) for the purge gas can not be too great. The pressure that exists in the supply conduit (5), therefore, is insufficient to carry out the amount of catalyst through the core firing machine in as short a time as is desirable. Referring to Figure 2, a catalyst is contained in a pressurized container (11) which can be a simple gas bottle, and the pressurized container (11) is placed on the scales (12) in order to determine its content. The pressed container (11) can be heated by means of the heater (13). An amount of the optimum catalyst determined above is introduced through the first valve (14) into the pressure vessel (15) and a first valve (14) is closed. The purge gas is supplied to the pressure vessel (15) through the conduit (16) by the second valve (17) at a pressure of 0.1 to 10 bar. The second valve (17) is then closed and the third valve (18) is opened in order to introduce a mixture of the catalyst and the purge gas which is present in the pressure vessel (15) to the supply conduit (19) and to the core firing machine (not shown). If desired in order to greatly eliminate discomfort due to the odor of the catalyst, the second valve (17) can remain open, while the third valve (18) is opened so that the purge gas continues to be introduced into the triggering machine. cores through the pressure vessel (15) after the mixture of the catalyst and the purge gas has passed to the core firing machine. Figure 3 shows an apparatus similar to that shown in Figure 2, but the apparatus also has a regulated supply bellows (20), a fourth additional valve (21) placed between the first valve (14) and the pressure container ( 15) and there is no heater. When the apparatus is used, the liquid catalyst in the pressurized container (11) is conducted through the first valve
(14) to the regulated supply bellows (20), wherein the catalyst is transformed from the liquid state to the gaseous state. The first valve (14) is then closed and the fourth valve (21) is opened, and the quantity of gaseous optimized catalyst is introduced into the pressure vessel (15), while the second valve (17) and the third valve (18) remain closed. After the fourth valve (21) has been closed, the second valve (17) is opened and purge air is introduced into the pressure vessel (15). The third valve (18) is then opened and the mixture of the catalyst and the purge gas is introduced into the core firing machine (not shown) through the supply conduit (19).
Claims (8)
1. A method for supplying an optimized amount of catalyst to a core firing machine for the manufacture of cores or molds for casting processes, wherein a catalyst is extracted from a pressurized vessel (11) in liquid or gas form, and it is mixed with a purge gas before it is introduced into the core firing machine, characterized in that first, an optimized amount of catalyst and secondly, the purge gas at a pressure of 0.1 to 10 bar are fed to a container of pressure (15), the catalyst and the purge gas are mixed in the pressure vessel (15) and the resulting mixture is introduced into the core firing machine.
2. A method according to claim 1, characterized in that the catalyst in gaseous form is heated at a temperature of 3 ° C to 80 ° C in the pressurized container (11).
3. A method according to claim 1, characterized in that the catalyst in liquid form is fed to the regulated supply bellows. (20) before being fed in gaseous form to the pressure vessel (15). -
4. A method according to any of claims 1 to 3, characterized in that the catalyst is trimethylamine.
5. A method according to any of claims 1 to 4, characterized in that after the introduction of the catalyst mixture and purge gas to the core firing machine, additional purge gas is fed to the firing machine. cores through the pressure container (15).
6. The apparatus for supplying an optimized amount of catalyst to a core firing machine for the manufacture of cores or molds for casting processes comprising a pressurized vessel (11) for containing the catalyst, a means (12) for determining the amount of catalyst in the pressurized container, means (14) for driving the catalyst to a conduit (19) in order to supply the catalyst to a core firing machine, and means (16, 17) for supplying a purge gas to the apparatus, characterized in that the apparatus also has a pressure vessel (15) positioned between and connected to the pressurized vessel (11) and the supply conduit (19), and the purge gas supply means (16) it is connected to the pressure container (15). -
7. The apparatus according to claim 6, characterized in that the apparatus. it has a means (13) for heating the catalyst in a pressurized container (11). The apparatus according to claim 6, characterized in that the apparatus has a regulated supply bellows (20) placed between the pressurized container (11) and the pressure container (15) so that the catalyst can be transformed into the gaseous form before being fed into the pressure container
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19723314.7 | 1997-06-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| MXPA99011208A true MXPA99011208A (en) | 2001-05-17 |
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