Method for preventing air bubbles in the transfer ring hole of the upper bracket of an automobile transmission

Abstract

The present invention relates to a method for preventing bubbles in the transfer ring hole of an upper bracket of an automobile transmission. The bracket of an automobile transmission is die-casted using upper and lower molds, and an overflow is installed in the transfer ring hole portion of the upper mold. This causes molten metal to move from a horizontally arranged auxiliary in-gate runner into the transfer ring hole space of the upper mold, resulting in an overflow phenomenon. The overflowed molten metal is then removed during subsequent post-processing to stabilize the metal flow. By increasing the molten metal overflow portion of the transfer ring hole of the upper bracket of the automobile transmission, installing an auxiliary in-gate, improving the thickness of the auxiliary in-gate, and sufficiently securing the mixing section, the quality of the product is improved and the manufacturing cost is reduced, thereby providing a significant economic effect.

Description

Technology Field

[0001] The present invention relates to a method for preventing bubbles in the transfer ring hole of an upper bracket of an automobile transmission, and more specifically, to an economical method for preventing bubbles in the transfer ring hole of an upper bracket of an automobile transmission by installing an auxiliary gate and an auxiliary in-gate connected to the auxiliary gate, improving the quality of the product, and sufficiently securing the mixing section, thereby lowering the manufacturing cost. Background Technology

[0002] Generally, the bracket is a bracket that holds the automobile transmission to the frame. However, there is a problem with air bubbles forming in the transfer ring holes of the upper bracket. There is a lack of auxiliary i-GATE filler and mold mating sections.

[0003] The cavity spacing of 300mm was unreasonable for setting casting conditions and resulted in high mounting and injection loads due to the heavy weight of the mold. In other words, there were disadvantages such as core thermal deformation, unreasonable mating, and ejector pin bending.

[0004] In the die-casting process for the lower bracket of an automotive transmission, post-processing is required due to areas where thin sections break; although this section is structured to maintain the material's shape, poor forming performance frequently occurs.

[0005] When die-casting a TM (transmission) SUPT BRKT LOWER, erosion occurs in the molten metal flow application area, and erosion occurs directly in the shape of the RIB during molten metal filling. In order to solve such casting problems, as an example of prior art, in a method of casting an engine bracket and a compressor case for an automobile using an aluminum alloy as disclosed in Publication No. 10-2010-0094856 AC4C,

[0006] A casting method for an engine bracket and a compressor case for an automobile is disclosed, characterized by comprising the steps of: melting an AC4C aluminum alloy at a temperature of 790 to 810°C to produce a molten metal; injecting Ar gas into the molten metal for 3 to 7 minutes to degas the molten metal; then injecting Ar gas and flux into the molten metal while rotating an impeller by a motor to generate bubbles, thereby performing additional degass treatment on the molten metal for 5 to 15 minutes using a GBF device; and maintaining the degassed molten metal at 700 to 740°C while injecting it into a mold. In addition, Patent No. 10-2213306 discloses a support bracket for a transmission, Publication No. 20-2010-0005955 discloses a damper bracket for an automobile suspension system, Patent No. 10-2178422 discloses an aluminum caliper bracket casting device for an electric vehicle, and Publication No. 10-2013-0120187 discloses a method for manufacturing an automobile hood bracket. However, the above prior art technologies had problems such as air bubbles forming and breakage occurring at the parting line due to poor flow. In addition, there was a disadvantage in that defects were concentrated in the transfer hook hole of the upper bracket. The problem to be solved

[0007] Accordingly, the present invention was devised to solve the above-mentioned problems, and aims to provide an economical method for preventing air bubbles in the transfer ring hole of an automobile transmission upper bracket by installing an auxiliary gate and an auxiliary in-gate connected to the auxiliary gate, improving the quality of the product, and lowering the manufacturing cost by sufficiently securing the mixing section. means of solving the problem

[0008] The present invention relates to a method for preventing air bubbles in the transfer ring hole of an upper bracket of an automobile transmission, wherein the bracket of an automobile transmission is die-cast formed by upper and lower molds, and an overflow is installed in the transfer ring hole portion of the upper mold so that molten metal moves from a horizontally arranged auxiliary in-gate runner into the transfer ring hole space of the upper mold, causing an overflow phenomenon, and the overflowed molten metal is removed during subsequent post-processing, thereby stabilizing the metal flow. Effects of the invention

[0009] Therefore, the present invention has a significant economic effect by installing an auxiliary gate in the molten metal overflow area of ​​the transfer ring hole of the upper bracket of the automobile transmission, and by sufficiently securing the auxiliary in-gate connecting to the auxiliary gate, improving the quality of the product, and lowering the manufacturing cost. Brief explanation of the drawing

[0010] Figure 1 is a photograph of the bracket of the automobile transmission of the present invention. FIG. 2 is a photograph taken from the top of the bracket of the automobile transmission of the present invention. FIG. 3 is a side view of the bracket of the automobile transmission of the present invention. FIG. 4 is a side view of the upper bracket of the automobile transmission of the present invention. Figure 5 is a photograph of the lower surface of the upper bracket of the automobile transmission of the present invention. Figure 6 is an upper photograph of the lower bracket of the automobile transmission of the present invention. Figure 7 is a photograph of the lower bracket of the automobile transmission of the present invention. FIG. 8 is a casting plan for the lower bracket runner gate of the automobile transmission of the present invention. FIG. 9 is a casting method for raising the in-gate parting line of the lower bracket of the automobile transmission of the present invention. FIG. 10 is a casting method for forming an additional wall on the lower bracket in-gate of an automobile transmission according to the present invention. FIG. 11 is a diagram of the upper bracket mold structure of the automobile transmission of the present invention. FIG. 12 is a quality improvement diagram according to the upper bracket casting method of the automobile transmission of the present invention. FIG. 13 is a configuration diagram of the improvement of the upper bracket auxiliary in-gate gap and securing the mating section of the automobile transmission of the present invention. Specific details for implementing the invention

[0011] The present invention relates to a method for preventing air bubbles in the transfer ring hole of an upper bracket of an automobile transmission, wherein the bracket of an automobile transmission is die-cast formed by upper and lower molds, and an overflow is installed in the transfer ring hole portion of the upper mold so that molten metal moves into the space of the transfer ring hole of the upper mold and an overflow phenomenon occurs, and the overflowed molten metal is removed during subsequent post-processing to stabilize the metal flow.

[0012] In addition, the molten metal is characterized by being injected in the horizontal direction of the upper mold.

[0013] In addition, the upper mold is characterized by forming a molten metal flow path structure that branches into two, thereby manufacturing two products at once.

[0014] In addition, a horizontally positioned auxiliary gate is installed on the left protrusion portion, which is the rear side of the left side of the mold, so that molten metal is injected together with the main gate.

[0015] delete

[0016] The present invention will be described in detail with reference to the attached drawings as follows.

[0017] As illustrated in the photographs in FIGS. 1 to 5, the upper bracket (200) has coupling holes formed in an elliptical cross section. A step is formed at the rear, and a vertical cross section is formed in the shape of a '⊂' in the upward direction, with a transfer ring (201) formed on one side of the transfer ring (201). Air bubbles are prone to forming in the transfer ring (201). The lower surface has a grid-shaped rib structure for weight reduction and strength increase.

[0018] As illustrated in the photographs in FIGS. 6 and 7, the lower bracket has coupling holes formed in a part of the rectangular prism for connection with the upper bracket, and coupling holes formed in the remaining part for connection to the automobile frame. Left and right protrusions are formed on the left and right sides of the upper surface, respectively. The lower surface has a grid-type rib structure to reduce weight and increase strength.

[0019] FIGS. 11 and 12 describe the casting process of the upper bracket (200) of the present invention, in particular the overflow, gate (30), auxiliary gate, vacuum die casting (Vacuum DC), etc. as follows.

[0020] As illustrated in FIG. 13, the present invention increases the width of one side of the in-gate (55) by about 4 mm to improve the air bubbles in the transfer ring hole, and increases it to 51 to 53 mm, and installs a transfer ring hole portion overflow (56) in the transfer ring hole. Thus, increasing the width of the in-gate (55) and increasing the volume of the overflow portion has the effect of improving product quality.

[0021] delete

[0022] Additionally, molten metal moves from the auxiliary runner (53) to the horizontally positioned auxiliary in-gate (52) connected to the transfer ring hole, causing an overflow. The overflowed metal is removed during subsequent post-processing. The metal flow is stabilized by modifying the auxiliary in-gate (52).

[0023] delete

[0024] The "parting section" refers to the joining surface (parting line) formed where two parts of the mold meet. It is the mold parting line. If the area of ​​this section is too narrow or too wide, it affects the sealing performance and filling pressure of the molten metal.

[0025] Improves the in-gate thickness reduction of the mold connected to the auxiliary gate and secures the mating section. The protrusion amount of the thickness reduction prevention pad is increased to 1~2mm, and the mating section is increased to 17~19mm.

[0026] delete

[0027] To explain the vacuum die casting process, utilizing a vacuum in aluminum casting has the advantage of increasing hardness (e.g., 75~80 in general → 100 in vacuum) and achieving weight reduction compared to the existing weight.

[0028] In addition, the molten metal is generally injected from the side (horizontal) rather than the top due to the characteristics of the die-casting process.

[0029] The present invention reduces the distance between cavities to 255 mm to produce two products at once in a mold structure.

[0030] delete

[0031] And the filling rate of the present invention is 46.5% when using a Ø100 sleeve.

[0032] Apply Chill block (vaccum block common size).

[0033] The solidification time of the manufacturing process of the present invention is 17 seconds, the casting pressure is 300 to 320 kgf / cm2, and the mold temperature is 200 to 250 degrees.

[0034] delete

[0035] The lower bracket (100) has coupling holes formed in a part of the rectangular prism for coupling with the upper bracket (200), and coupling holes formed in the remaining part for coupling with the car frame. Left and right protrusions (11, 12) are formed on the left and right sides of the upper surface, respectively. The lower surface has a grid-shaped rib structure to reduce weight and increase strength.

[0036] delete

[0037] In FIG. 8, the present invention changes the position of the bubble improvement channel. Specifically, the channel, which previously exited from a U-shape, is changed to start from the left and right protrusions (11, 12) as shown in the drawing and connect to the overflow pipe, or channel, at the top. The overflow pipe draws out gas and residual volume from the mold (10) to the outside and ensures that the molten metal inside the mold is sufficiently filled. Furthermore, as shown in FIG. 9, the present invention improves the flow by raising the height of the in-gate parting line (13). As shown in FIG. 10, the parting line is formed higher than the center line to prevent excess material from forming on the parting line and is improved through post-processing.

[0038] The internal Euro structure of the product has been improved from the existing single-flow method to a bifurcated structure, and the channel positions have also been changed to reduce bubbles. In addition, the parting (gate) height has been raised by approximately 13mm to improve charging stability.

[0039] In addition, the roundness of the two joint grooves marked in red in Drawing 11 is increased compared to the existing one to prevent early cracking in those parts.

[0040] The solidification time is 16 seconds, the casting pressure is 310~320 kgf / cm2, and the mold temperature is 200~250 degrees.

[0041] delete

[0042] Therefore, the present invention installs an auxiliary gate and a molten metal overflow area in the transfer ring hole of the upper bracket of the automobile transmission, and improves the thickness of the auxiliary in-gate and sufficiently secures the mixing section, thereby improving the quality of the product and lowering the manufacturing cost, resulting in a significant economic effect. Explanation of the symbols

[0043] 100 : Lower bracket 200 : Upper bracket 201 : Transfer hook 10 : Mold 11, 12 : Left / Right protrusions 13 : In-gate parting line 20 : Runner 30 : Gate 40 : Injection port 50 : Mold 51 : Auxiliary gate 52 : Auxiliary in-gate 53 : Auxiliary runner 54 : Main runner 55 : In-gate 56 : Hook section overflow 57 : Overflow (tube)

Claims

Claim 1 In a method for preventing air bubbles in the transfer ring hole of an automobile transmission upper bracket, wherein the upper and lower brackets (100, 200) of an automobile transmission are die-cast formed by upper and lower molds, and an overflow is installed in the transfer ring hole of the upper mold so that molten metal moves into the space of the transfer ring hole of the upper mold and an overflow phenomenon occurs, and the overflowed molten metal is removed in subsequent post-processing to stabilize the metal flow, wherein the molten metal is injected in the horizontal direction of the upper mold, and the upper mold is formed with a molten metal flow path structure that branches into two branches to manufacture two products at once, the upper bracket (200) has an elliptical cross section with coupling holes formed therein and a step formed at the rear, a vertical cross section in the upward direction with a '⊂' shape and a protrusion formed on one side of the protrusion, and the lower surface has a grid-type rib structure for weight reduction and strength increase, and to improve the air bubbles in the transfer ring hole, one side of the in-gate width is 51 ~ The length is set to 53mm, a ring portion overflow (56) is installed in the transfer ring hole portion, an auxiliary in-gate (52) is installed horizontally in the transfer ring hole, and the in-gate (55) of the mold connected to the auxiliary gate (51) is improved to secure a mold parting line joining section, so that the protrusion amount of the anti-defect pad is 1~2mm and the joining section is 17~19mm, the solidification time of the molten metal is 17 seconds, the casting pressure is 300~320kgf / cm2, and the mold temperature is 200~250℃, the lower bracket (100) has coupling holes formed in a part of a rectangular parallelepiped, and left and right protrusions (11, 12) are formed on the left and right sides of the upper surface respectively, and the lower surface has a grid-type rib structure to reduce weight and increase strength, and a channel, which is an overflow pipe, is connected from the top starting from the left and right protrusions (11, 12), and the overflow pipe It extracts gas and residual volume from the mold to the outside and ensures that the molten metal in the mold is sufficiently filled,A method for preventing air bubbles in a transfer ring hole of an upper bracket of an automobile transmission, characterized by forming the parting line 13mm higher than the center line to prevent excess material from forming on the parting line and increasing the roundness in two joining groove areas to prevent crack formation. Claim 2 delete Claim 3 delete

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