LOW PRESSURE WHEEL CASTING MOLD

Abstract

The invention relates to a mold used in low-pressure casting of aluminum alloy wheels, which reduces the visibility of oxide film, inclusions, slag residue and similar foreign substances in the molten metal on the visible front surface. The mold consists of a lower core (1), an upper core (2) and side blocks (3). In the conventional configuration, the wheel geometry formed by the lower core (1) is formed by the upper core (2), and the wheel geometry formed by the upper core (2) is formed by the lower core (1). The side blocks (3) are adapted to this reverse geometry, enabling the reversal of the wheel's orientation within the mold. This reduces the likelihood of foreign substances accumulating or being exposed on the aesthetically critical visible surface of the wheel; improves surface quality and reduces repair, finishing and scrap costs.

Description

1 Specifications LOW PRESSURE WHEEL CASTING MOLD Technical field The invention relates to the field of metal casting technologies and concerns the lower-mounted lightweight alloy vehicle wheels. 5 within the scope of multi-part molds used in production by the pressure die casting method. is being evaluated. The invention specifically deals with oxide films, inclusions, slag residues, and the like in molten metal. To reduce the accumulation of foreign substances on the visible front surface of the rim, the rim... reversing the orientation within the mold; the geometric relationship between the lower and upper cores. A 10-bit system that includes side blocks that alternate their functions and are adapted to this system. It relates to low-pressure wheel casting molds. Previous technique Today, low-pressure casting is used in the production of aluminum alloy wheels. In this method, molten metal is transferred from the holding furnace through a riser pipe and a runner. It is conveyed into the mold cavity under controlled pressure; filling the mold cavity, 15 The rim is obtained by feeding and solidifying it under pressure. As is known... The molds consist of a lower core, a top core, and circumferential side mold parts; Geometric arrangements primarily depend on filling adequacy, feeding, solidification, and mold release. It focuses on extraction and ensuring mechanical properties. Formed during the transport and movement of molten metal through the mold cavity or 20 Carried oxide films, inclusions, and slag residues enter the part along with the metal flow. These foreign objects can be dragged along. These foreign objects are visible to the user from the front of the rim. remaining in areas close to the surface; point contamination, oxide residue or during finishing This can create an exposed surface defect. Such a defect can affect leveling and the surface. Correction, rechecking, and debugging may be required; if not resolved, the part will be 25% damaged. This can lead to it being scrapped. CN102806334A and “Low-pressure casting mold for aluminum alloy wheel hub” in the patent document titled "and pouring method of low-pressure casting mold" The mold core, left and right side molds, and the bottom mold form a rim casting cavity. It is formed by a 30 where the entries in the side molds are directly connected to the rim opening. 2 The pattern is explained. This pattern is based on side filling and solidification time. focusing on lightness and mechanical properties; geometric design of the upper and lower cores. By mutually transferring their functions, the orientation of the rim within the mold is reversed. turning it over and thus keeping foreign substances away from the visible surface It does not explain. 5 CN101837443A and “Low-pressure casting process and device for aluminum The patent document titled "alloy wheel by bilateral pouring" describes an aluminum alloy wheel. For this purpose, double-sided casting, metal entry from both sides of the rim, and controlled cooling. The principles are explained. The solution relates to filling direction and solidification control. together, by swapping the lower and upper core geometries in the traditional mold, 10 by creating the cast rim in the opposite orientation, visible surface defects It does not offer a mold configuration for reduction. EP0549141A2 and “A casting mold for casting of vehicle wheels and method The patent document titled "for manufacturing them" describes the casting of vehicle wheels. The mold and the production method using this mold are explained. The document describes the wheel geometry as 15. The creation of mold parts and the casting process are discussed; however, to reduce the appearance of foreign substances on the aesthetically critical front surface by the mutual transfer of the geometric functions of the core and the supercore Reshaping the appropriate side blocks is not taught. The objective technical problem to be solved within this framework is; the mold size of 20 in low-pressure wheel casting. While the filling and rim forming functions are preserved, foreign substances found in the molten metal are removed. The substances become prominent on the visible and aesthetically critical front surface of the final rim. The probability of this happening is reduced through the mold geometry. Purpose and Advantages of the Invention The aim of the invention is to produce an oxide film on aluminum alloy wheels manufactured by low-pressure casting, 25 inclusions, slag residues and similar foreign substances appearing on visible surfaces The goal is to provide a mold configuration that reduces the likelihood of detachment. To this end, the traditional orientation of the rim is reversed. In traditional design, the rim geometry formed by the lower core is the upper core. by; the rim geometry formed by the upper core is determined by the lower core 30 3 It is being formed. The side mold parts also consist of a hub, rib, and tire in reverse orientation. The surface is arranged in a way that complements the surrounding areas. The technical effect achieved is that foreign substances carried by the metal flow are removed from the rim by the user. Gathering or remaining close to the surface on the front surface, which is directly visible. The goal is to reduce the tendency [of this trend]. Thus, surface quality and production quality consistency are improved. 5 Improvement; leveling, grinding, surface correction, inspection and repair of surface defects. Reducing scrap rates and associated production costs through sorting processes is provided. Industrial Applicability The invention is applicable to the automotive and metal casting industries; passenger cars, light commercial vehicles and similar 10 in low-pressure casting lines of aluminum alloy wheels for vehicles It is applicable in production. Mold parts are manufactured using existing mold manufacturing methods. It can be manufactured and adapted to low-pressure casting machines. Same reverse orientation. the principle is that visible surface quality is important and has a suitable mold release structure. It can also be adapted for other lightweight alloy castings. 15 Explanation of the Figures Figure 1 is a cross-sectional view of a conventional low-pressure wheel casting mold. Figure 2 shows a cross-section of the reverse-oriented low-pressure wheel casting mold, which is the subject of the invention. It is the appearance. References Explanation 20 Ref. No. Description 1 Sub-core 2 Upper cores 3 Side blocks 4 Detailed Description of the Invention The invention is a multi-purpose method for producing a lightweight alloy wheel by low-pressure casting. It is a segmented casting mold. The mold shown in Figure 2 consists of a lower core (1), an upper core It includes the core (2) and the side blocks (3) located in the circumferential part of the mold. Bottom The core (1), upper core (2) and side blocks (3) are assembled together in the closed position to form 5 It forms a rim-shaped mold cavity into which molten metal is filled. During the low-pressure casting process, the molten metal is placed in a holding furnace. The pressure is transmitted from the metal bath to the mold cavity via a runner. The mold cavity is filled, metal is fed in, and solidification occurs through this process. Once completed, the mold is opened and the rim is removed. 10 in molten metal oxide film, inclusions, slag residue and similar foreign materials that may be found in the filling During this process, metal can be transported by flow. In the traditional configuration shown in Figure 1, certain geometric regions of the rim are under by the core (1) and upper core (2) according to the traditional orientation It is created. In this configuration, foreign substances are prevented from reaching the visible front surface of the rim by 15 pinpoint contamination or oxide marks remaining near or on this surface after casting. or it may appear as a sign of superficial inclusion. According to the invention, the rim formed by the lower core (1) in the conventional configuration its geometry to the upper core (2), in the conventional configuration by the upper core (2) The rim geometry created is transferred to the lower core (1). Thus, the rim mold 20 The orientation within the gap is reversed compared to the traditional arrangement, and the rim is upside down. It is poured in this position. The aforementioned reciprocal geometric transfer is only This does not mean a positional displacement of the nuclei; it means a sub-nucleus. (1) and the reverse of the surfaces forming the rim shape of the mold cavity of the upper core (2) It means shaping it in a way that is suitable for the orientation. 25 The side blocks (3) shown in Figures 1 and 2 represent the circumferential shape of the rim in reverse orientation. to complete it from that direction and to create the closed formwork cavity again It is designed. The inner surfaces of the side blocks (3) are the corresponding surfaces of the lower core (1) and the upper core (2). The tire surface, ribs, and hub areas of the rim, along with their surrounding surfaces, make up the lower part of the wheel. Transition surfaces between core (1), upper core (2) and side blocks (3), mold 30 When closed, they are arranged in a way that ensures the continuity of the rim geometry. They match. As a result of reverse orientation, areas where foreign materials are carried during filling. the positional relationship between the solidified front surface of the rim and the surface visible to the user is being altered. Thus, foreign substances are removed from the aesthetically critical front surface. accumulation, remaining near this surface, or being exposed on this surface during finishing The possibility is reduced. The technical effect is the complete elimination of foreign substances. 5 not by removal, but by changing the visible surface through mold geometry and part orientation. It is based on redirecting resources to less critical areas. In the preferred implementation format, the lower core (1), upper core (2) and side blocks (3), Hub, rib, and tire surface geometries of aluminum alloy vehicle wheels. It is arranged in such a way as to form. After the mold is closed, molten aluminum 10 The alloy is fed into the mold cavity under low pressure. The mold cavity After filling and solidification of the metal, the side blocks (3) open up, the lower core (1) The upper core (2) is separated from the wheel mold and cast in reverse orientation. is being removed. The defects on the visible front surface of the obtained rim, caused by foreign matter, are 15. by reducing the need for surface finishing and grinding, re-checking and weeding. The number of operations is reduced. For the same reason, the amount of scrap due to defects is reduced, and serial production is improved. Surface quality consistency is improved during production, and finishing costs are reduced. In another application, the same reverse orientation principle is used on passenger car wheels as well. It can be applied to light commercial vehicle rims. Alternatively, it can be applied to lower 20-inch rims. The shapes of the core (1), upper core (2) and side blocks (3) of the hub of the rim to be produced, The design of the tread and tire surface is being modified; however, traditional lower and upper tread patterns are different. Interchange of core geometries and casting of the rim in reverse position. is protected. Furthermore, the principle applies where visible surface quality is critical and multi-part. It can be adapted to other aluminum alloy casting parts that can be produced by molding. 25 In the form of the invention, the core and side block material, dimensions or casting pressure, Since specific numerical ranges for temperature and time values ​​are not specified, this considerations include not unnecessarily limiting the scope of protection and not disclosing Technical data is not included and is not limited to specific values. These parameters, depending on the aluminum alloy used, the wheel geometry, and the low-pressure casting line 30 This can be determined according to operating conditions.

Claims

6 Requests 1. The invention describes the production of an aluminum alloy wheel rim by low-pressure casting. a lower core (1) that forms a rim-shaped mold cavity in the closed position, an upper a low-pressure rim casting mold containing core (2) and circumferential side blocks (3) and its feature is that it will create the rim geometry created by the sub-core (1) 5 The mentioned upper core (2) is formatted in this way, by the upper core (2) the aforementioned sub-section is shaped to create the generated rim geometry. reverse the orientation of the core (1) and the rim within the mold cavity The sub-core (1) and the super-core (2) mentioned in the figure are adapted side-cores. It contains blocks (3). 10 2. According to Claim 1, it is a low-pressure wheel casting mold, and its characteristic is; the aforementioned side blocks (3) will complete the circumferential geometry of the rim in reverse orientation and closed mold between the mentioned lower core (1) and the mentioned upper core (2) It has internal surfaces that will create the void.

3. Low-pressure wheel casting mold according to claim 1 or 2, its characteristic is; the aforementioned sub-15 the core (1), the aforementioned upper core (2) and the aforementioned side blocks (3), the rim by forming the hub, rib, and tire surface areas in reverse orientation It is the arrangement.

4. Low-pressure wheel casting mold according to any of claims 1 to 3, its characteristic is; The aforementioned reverse orientation is found in the oxide film, inclusions, and slag in the molten metal. 20 residue and similar foreign substances becoming noticeable on the visible front surface of the rim. It is about establishing a positional relationship that will reduce the probability of...

5. The invention is a method for the production of an aluminum alloy wheel, the characteristic of which is the Claim. The low-pressure wheel casting mold mentioned in sections 1 to 4; - closed by the rim 25 between the lower core (1), upper core (2) and side blocks (3). creation of a shaped mold cavity, - molten aluminum alloy under low pressure in the aforementioned mold transmitted into the void, - solidifying the aforementioned molten aluminum alloy in the mold cavity, - opening the mold and removing the wheel rim that was cast in reverse orientation, 30 It includes the steps of the process. 7 6. The method according to claim 5, characterized by; an oxide film on the visible front surface of the rim, surface caused by inclusions, slag residue and similar foreign materials The probability of defects occurring is due to the geometric relationship between the lower core (1) and the upper core (2). It is the reduction of functions through the mutual transfer of functions.

Images