RU2174890C1 - Mould cores making method - Google Patents

Abstract

FIELD: foundry. SUBSTANCE: invention can be used in production of cores for heating radiator castings. According to proposed method, open halves of core boxes are filled up with core mix and gas outlet channels are made in mix. Then mix is solidified by gas-air mixture and gluing compound is applied at least to one of core halves, after which both halves are connected. Ready core is taken out. EFFECT: automatic production of high-quality mould cores with gas outlet channel. 1 ex

Description

 The invention relates to the field of foundry, and more specifically to methods for manufacturing rods for castings such as heating radiators.

 A known method of manufacturing casting cores from a mixture with a thermoplastic binder, an organic solvent and a refractory filler, comprising filling the finished mixture with cold tooling and shaping in it, purging the mixture with a chemically inert gas and removing the finished molds and cores from the tooling [1].

 The disadvantage of this method is the inability to manufacture with its help radiator rods.

 There is also known a method of manufacturing casting cores, the closest in technical essence and the number of common features, adopted as the closest analogue, including filling the core mixture of core boxes, curing it with a gas-air mixture and removing the cores [2].

 A disadvantage of the known method [2] is also the impossibility of manufacturing radiator rods with it, since in their production it is necessary to form a gas outlet channel, without which it is impossible to ensure good quality casting.

 The task to which the proposed method is directed is the possibility of manufacturing high-precision radiator rods with a gas outlet in the automatic mode of their production on cold equipment, which will achieve a technical result to reduce rejects by at least 10 times.

 The above technical result is achieved due to the fact that in the manufacture of foundry cores, which consists in filling the core mixture with cold core boxes, curing it with a gas-air mixture and removing finished rods, according to the invention, the open halves of the core boxes are filled with a core mixture, form gas channels, and after curing, at least one of the rod halves is coated with an adhesive and, in no more than 2-7 seconds, the two halves of the rod are connected before being removed.

 In the manufacture of foundry, in particular radiator, rods, the operation of forming a gas outlet channel is known in rods made of two halves, which are connected by “collapsing” the upper and lower halves of the split core box, after which curing is achieved by drying in ovens [3].

 Thus, the absence of curing operations using a gas-air mixture leads to a significant increase in the time for the manufacture of rods and reduce labor productivity.

 The gluing operation in the manufacture of foundry cores is also known [4]. But in this case, operations for the formation of a gas outlet channel and curing are carried out at the previous stages of manufacture and they are not connected in a common time cycle, which also reduces labor productivity.

 The applicant has not found technical solutions containing the general set of features indicated in the claims, namely, the named sequence of techniques and operations with an appropriate time mode of their implementation, consisting in the manufacture of radiator rods from halves in which a gas outlet channel is formed, their cold curing gas-air the mixture, applying the adhesive composition and joining these halves in the range of 2-7 seconds before removal, i.e. unknown is the method of manufacturing halves of radiator rods with a channel by blowing them and subsequent curing with a gas-air mixture.

 This allows us to conclude that the claimed method meets the criteria of the invention of "novelty" and "inventive step", since only the combined use of all the essential features specified in the claims allows to achieve a technical result that ends in increasing the accuracy of manufacturing and reducing the marriage of products.

 The method is as follows.

 As an example of the implementation of the claimed method, the operation of the installation for the manufacture of foundry cores with a gas channel is carried out. In the first position, the open upper and lower halves of the core boxes are filled with the help of the inflation mechanism of the core mixture. In this case, the lifting table lifts and presses the half of the core boxes to the inflatable plate, on which the elements forming the gas outlet channel are fixed. Then the lifting table lowers the half of the core boxes onto the carousel, which moves them to the next position, where, after pressing the air-gas mixture purge mechanism to the plate, curing is carried out. Moreover, in the formed gas outlet channels in order to maintain their integrity, elements are introduced that correspond in shape to the elements mounted on the inflatable plate. Prior to supplying the curing gas-air mixture in the halves of the rods, pruning is performed with the help of pins to communicate the gas outlet channel with the atmosphere.

 After purging with a curing gas-air mixture, half of the casting cores acquire sufficient strength. A phenolisocyanate composition can be used as a binder mixture of the core, and a tertiary amine as a hardening gas.

 After curing, half of the core boxes with the carousel are moved to the next position. The air purge mechanism removes the remnants of unreacted gas mixture. Then, the halves of the core boxes are moved to the next position in the manner described above, where an adhesive is applied to one of the rod halves using an adhesive device, after which both halves are connected in 2-7 seconds. For this operation, a mechanism for opening and closing the upper and lower halves of the core boxes is provided, which from a horizontal position turns them towards each other, making contact between the halves of the rods and gluing them together.

 After bonding the halves of the rods and the formation of a solid radiator rod, the upper and lower halves of the core boxes are opened by the same opening-closing mechanism. In this case, the integral rod remains in the lower half of the core box and is pushed out of it using automatically actuated pushers, which makes it possible to remove the finished radiator rod with an internal gas outlet channel.

 Using the proposed method will allow to produce high-quality foundry cores with a gas channel in automatic mode.

Sources of information:
1. A.S. USSR N 755413 according to class B 22 C 9/10 for 1978

 2. British patent N 1598523 for CL. B 22 C 11/04 for 1981

 3. Guide to iron casting, ed. 3, edited by N.G. Girshovich, L. Mechanical Engineering, 1978, p. 568.

 4. The textbook "Foundry" edited by I.B.Kumanin, M. Mechanical Engineering, 1971, p. 147.

Claims (1)

 A method of manufacturing casting cores, including filling the core mixture with cold core boxes, curing it with a gas-air mixture and removing the rods, characterized in that the open core halves of the core boxes are filled with the core mixture, form vent channels, and after curing, at least one of the core halves apply the adhesive and connect both halves before removing it.