A flexible blowing nozzle having quick and easy assembly feature, extended lifetime

Abstract

A nozzle (10) having a main body (11), comprising a blowing cavity (16) through said main body (11) for conveying resin-mixed sand into the core mould which resin-coated sand is conveyed to the core mould, characterised in that it comprises a main body (11) made of a flexible, plastic-based material and a top connection extension (13) for fixing said nozzle (10) to the nozzle plate (30).

Description

[0001] DESCRIPTION

[0002] A FLEXIBLE BLOWING NOZZLE HAVING QUICK AND EASY ASSEMBLY FEATURE, EXTENDED LIFETIME

[0003] Technical Field

[0004] The invention relates to nozzles for blowing the mixture of sand and resin into the corebox (a structure consisting of upper mould and lower mould components) used in the casting process.

[0005] The said invention relates to a blowing nozzle having a monolithic and / or composite structure, made of plastic etc. based material, having fast and easy assembly feature, and eliminating clogging problems thanks to its slippery surface structure.

[0006] Prior Art

[0007] As it is known, sand and resin are used in core manufacturing. The main material is transferred from a large mixer containing sand and resin and blown through nozzles from the upper shooting head to the corebox towards the moulding area where the upper mould and lower mould components are located. Blowing nozzles are used to blow sand and resin into the moulds.

[0008] The nozzles used in the prior art are mostly nozzles made of metal-based material. Due to the fact that the nozzle is metal-based, some technical problems are experienced during mass production. One of these technical problems is the blockage of the nozzle blowing path. In order to open the blocked path in the blockage case, the path is opened with a metal skewer or rod.

[0009] Another problem is that since the nozzle is a metal-based material, when the nozzle is centered, it may cause a destructive effect by direct contact with the moulds and then the corebox mould and the nozzle may be damaged.

[0010] Another important problem is that the nozzle contains multiple parts and is fixed to the plate with bolts and different fasteners through the mounting surface. Due to the high number of nozzles used on the mould, the labour processes are highly prolonged in the case of screwing each nozzle and then removing it from its place for repair and maintenance. In addition, core shooting machines have to stop. This situation has a high impact on production processes and costs.

[0011] Another important problem experienced in the prior art is that due to the fact that the nozzles contain metal-based material, a continuous flow occurs on the inner wall surface of the nozzle, and along with the flow, the resinous sand adheres to the inner wall of the nozzle depending on the time in this flow path and finally, area losses up to approximately 30% of the inner diameter of the nozzle occur.

[0012] This causes pressure loss due to the material passes faster through the gradually narrower diameter. The filling of the core volume will be adversely affected and with the increasing speed of the resinous sand, it may cause deformations in close areas on the corebox surfaces, as well as the resin separating from the sand and accumulating on the surfaces of the box (on the mould surfaces) may cause problems even up to measurement errors. This situation causes serious damage to the inner diameter of the nozzle and causes it to become dysfunctional over time and most importantly, it causes a decrease in the standard and quality in production.

[0013] The manufacturing method and material quality of the blowing nozzle, the coating to be applied are important criteria affecting the diameter surface abrasion in the resin sand blowing process. After the process, the deformations in the diameter will both create turbulence in the blowing flow and negatively affect the healthy core filling, and the abrasion of the nozzle diameter will accelerate and cause a rapid decrease in its own lifetime.

[0014] On the other hand; when the process sequence comes along with the plates on which the blowing nozzles are fixed, they enter the upper corebox collection plate within the tolerances of the machine axes and start the resin sand blowing operations. While the coreboxes (lower-upper moulds) are preparing to start the blowing process after the closing operation, depending on the tolerances of their axes, deformations may occur in the nozzle rigidity, nozzle outer diameter and nozzle tip, and this situation causes a decrease in the service life. Another important problem in the current technique is the sealing problem. Due to the fact that the nozzle contains metal-based material, the desired pressure tightness cannot be achieved. After the corebox, i.e. the upper and lower moulds are closed, the sand blowing operation starts. Nozzles are fixed on the plates with the help of a flange by giving clearance tolerance. The nozzles are fixed on the plate and are ready for the blowing operation by passing through the holes of the corebox collecting plate towards the core volume cavity, there is both a fitting tolerance on the outer diameter of the nozzle and a gap tolerance of the nozzle and the nozzle flange. In addition, due to the rigidity of the nozzle flange and the plate, full pressure cannot be provided and leakage problem occurs. Therefore, there is a loss in the blowing pressure and the sand cannot be delivered into the mould to the detailed areas.

[0015] Finally; when the blowing nozzles are in the production process and need to be replaced due to breakage or excessive wear, it is necessary to remove them from the corebox and send them to the modelling room or service area since a process that is not at the operator level is required. In this case, it is necessary to wait for the process or to connect a different corebox. All the above developments cause production losses, sand in the shooting losses and set up losses in production.

[0016] In the patent search regarding the prior art; a Chinese application CN212792196U was found. This application discloses a support frame, a conveying device for automatic feeding and unloading of castings, a sand blowing device arranged on the support frame and used for sand blowing on castings, a casting sand blowing device arranged in the centre of the conveying device.

[0017] Description of the Invention

[0018] The purpose of the invention is to present a different blowing nozzle which brings a new opening in this field, unlike the blower nozzles used in the existing technique. The most important purpose of the invention is to provide a nozzle which is made of plastic-based material, which has a monolithic (one-piece) structure due to its plastic-based material, which prevents clogging with its high abrasion resistance feature, and which can be easily cleaned with its slippery surface material structure.

[0019] Another important purpose of the invention is to prevent the breakage and abrasion errors that may occur in conventional nozzles by acting tolerantly in case of corebox closing axis errors during operation thanks to the flexibility of the nozzle due to its plastic-based material.

[0020] Another purpose of the invention is to enable the nozzle to be attached to the mould plate directly by hand in a fast and practical way without the need for bolts and other fasteners. In this way, a manual disassembly and assembly method is applied, which makes it possible to change the nozzles easily and quickly. This has a positive effect on production processes and costs without interrupting production processes.

[0021] Another object of the invention is that the resinous sand does not adhere to the inner diameter of the nozzle due to the fact that the nozzle is a plastic-based material, and the surface is smooth due to the structural feature of the NBR type plastic material, and thus the diameter contraction caused by adhesion to the inner diameter of the nozzle does not occur.

[0022] Another object of the invention is to prevent deformations such as abrasion and breakage by tolerating axis errors when the nozzle is a plastic-based material and the flexible structure of the nozzle enters the mould.

[0023] Another important purpose of the invention is that the flange of the nozzle with flexible material provides full sealing with full pressure on the plate surface. In the blowing operation, the pressure loss around the hole tolerances of the nozzle creates a gasket function thanks to the flexible body flange surface. Thus, it creates a high sealing effect with the structural and material properties of the nozzle without the need to use additional gasket type sealing elements. However; Improvement in filling time with blowing without pressure and sand loss and quality core production without porous structure will be obtained. However, the gassing quality will increase, gas consumption will be prevented and the gassing time will be shortened in deep cavities.

[0024] Another important purpose of the invention is that the nozzle is not fixed to the blowing plate with any fasteners, without the need to disassemble the corebox to send it to the service area, only the production operator allows the nozzle to be disassembled quickly and simply by hand force without using hand tools. In the same way, it is a nozzle that allows it to be quickly and simply assembled in place.

[0025] Figures to Help Understanding the Invention

[0026] Figure-1 ; is two-dimensional front view of the nozzle subject to the invention.

[0027] Figure-2; is two dimensional view of the nozzle subject to the invention in contact with the mould body.

[0028] Figure-3; is two dimensional view of the nozzle subject to the invention mounted on the top plate.

[0029] Figure-4; is the appearance of the nozzle used in the prior art.

[0030] Figure-4.1 ; is representative view of the resinous sand adhered to the inner diameter of the nozzle used in the prior art and showing the narrowing of the inner diameter.

[0031] Figure-4.2; is representative view of the nozzle used in the prior art showing that the inner diameter of the nozzle is deformed over time.

[0032] Reference Numbers

[0033] 10-Nozzle

[0034] 11- Main body 12-Step

[0035] 13-Top connection extension

[0036] 14-lnner surface

[0037] 15-Connection threads

[0038] 16- Blowing cavity

[0039] 17-Nozzle outer diameter surface

[0040] 18-lnner ring

[0041] 20-Lower mould plate

[0042] 30-Nozzle plate

[0043] 31 -Reverse directional fixing threads

[0044] P-Assembly direction

[0045] P1 -Assembly direction

[0046] S- Nozzle length

[0047] Detailed Description of the Invention

[0048] In FIG. 1 , a nozzle (10) having a main body (11 ), including a blowing cavity (16) through said main body (11 ) enabling the resinous moulding sand to be transferred to the core mould, and blowing the mixture material consisting of sand and resin into the moulds in the core moulds where the core process is performed, is illustrated as a representative.

[0049] The said nozzle (10) is an innovation in that it comprises a main body (11) made of a flexible, plastic-based material and a top connection extension (13) for fixing the said nozzle (10) to the nozzle plate (30). In order to fix said nozzle (10) to said nozzle plate (30), the top connection extension (13) is provided with connection threads (15) having threads in a different reverse direction compared to the reverse directional fixing threads (31 ) in the nozzle plate (30) (see figure-3). In figure-3, mounting is provided by means of the connection threads (15) having threads in a different reverse direction compared to the reverse directional fixing threads (31 ) in the nozzle plate (30). Likewise, for fixing the said nozzle (10) to the nozzle plate (30), the desired fixing process is carried out by means of the nozzle outer diameter surface (17) with a vertical single movement in the P direction with a single hand force without the need for any bolts and different fasteners. The nozzle, which is first flexed to the right or left in the P1 direction, moves to the disassembly position with the movement in the P1 direction.

[0050] On the other hand; between the nozzle plate (30) and the lower mould plate (20), there is a stage (12) that provides full sealing with its flexible structure without the need to use gaskets and different sealing elements. This stage (12) provides a high level of sealing in this area and at the same time creates a retaining surface for disassembly movement in the P1 direction.

[0051] The nozzle (10) comprises a monolithic main body (11 ) made of flexible plasticbased material with NBR material, and has a hardness ratio of 63% to 82%. At the same time, an inner ring (18) made of metal-based material enclosed in the nozzle length (S) of said main body (11) and forming high resistance in this nozzle length (S) is formed. This inner ring is an optional alternative configuration. It is a metal-based structure designed to be used when necessary.

[0052] However, it contains a flexible main body (11 ) that allows the sand and resin to be thrown out by flexing when the outlet opening of the blowing cavity (16) is squeezed by hand without the need to use wires and cleaning rods in case of adhesion to the surface of the material passing through the blowing cavity (16) where the sand and resin of the resin-mixed sand are in continuous flow.

[0053] In Figures-4, 4.1 and 4.2, the views of the nozzle (10) used in the prior art are illustrated. Since the nozzle (10) used in the prior art is a metal based material, sand and resin particles adhere to the inner surface (14). These particles cause the diameter of the inner surface (14) to narrow in this region over time. Likewise, it causes a high rate of surface defects on the inner surface (14) afterwards (see figure-4.2).

[0054] Since the nozzle subject to the invention is a flexible plastic-based material made of NBR material, it does not allow sand and resin to adhere on its inner surface (14) due to its structural and material properties. In order to prevent the adhesion of the material passing through the blowing cavity (16) where the sand and resin are in continuous flow, a slippery inner surface (14) with a hardness ratio of 63% to 82% is formed.

Claims

CLAIMS1- A nozzle (10) having a main body (11), comprising a blowing cavity (16) through said main body (11 ) for conveying resin-mixed sand into the core mould, and blowing the casting material consisting of sand and resin into the moulds in the casting moulds in which the casting process is performed, characterized in that it comprises;- a main body made of plastic-based material with a flexible structure (11 ),- a top connection extension (13) for securing the said nozzle (10) to the nozzle plate (30).2- The nozzle (10) according to claim 1 , characterised in that said nozzle (10) comprises connection threads (15) formed in the top connection extension (13) for fixing said nozzle (10) to said nozzle plate (30), having threads with different reverse directional threads compared to the fixing threads (31 ) in the nozzle plate (30) having reverse directional or straight serrated structure.3- The nozzle (10) according to claim 1 , characterised in that it comprises a stage (12) which provides complete sealing between said nozzle plate (30) and lower mould plate (20) with its flexible structure without the need to use gaskets and different sealing elements.4- The nozzle (10) according to claim 1 , characterised in that it comprises a main body (11 ) made of flexible plastic-based material with NBR material.5- The nozzle (10) according to claim 1 , characterised in that it comprises a main body (11 ) made of NBR material having a hardness ratio of 63% to 82%.6- The nozzle (10) according to claim 1 , characterised in that it comprises a monolithic main body (11 ) made of flexible plastic-based material.7- The nozzle (10) according to claim 1 , characterised in that said nozzle (10) comprises a nozzle outer diameter surface (17) which enables said nozzle (10) to be fixed to the nozzle plate (30) by a single verticalmovement in the P direction with a single hand force without the need for any bolts or other fasteners.8- The nozzle (10) according to claim 1 , characterised in that it comprises a flexible main body (11 ) which, in case the material passing through the blowing cavity (16) where the sand and resin are in continuous flow, adheres to the surface, allows the sand and resin to be ejected by flexing when the outlet opening of the blowing cavity (16) is squeezed by hand without the need to use wire and cleaning rod.9- The nozzle (10) according to claim 1 , characterised in that said main body (11 ) comprises an inner ring (18) made of metal-based material enclosed in the nozzle length (S) and partially structured from said nozzle length (S), forming high resistance.10-The nozzle (10) according to claim 1 , characterised in that it comprises a slippery inner surface (14) having a hardness ratio of 63 % to 82 %, which prevents the material passing through the blowing cavity (16) in which sand and resin are in continuous flow from adhering to the surface.

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