Mold structure of an automobile transmission clamp

Abstract

The present invention relates to a mold structure for an automobile transmission clamp. In the mold structure for an automobile transmission clamp, the mold has a rectangular cross-section with a large front width and a small rear width, forming coupling holes, a step is formed at the rear, a vertical cross-section in the upward direction is formed in a '⊂' shape, and a flange is formed on the left side. An auxiliary gate connected from an auxiliary runner is connected to the flange. The present invention has a cooler, an ejector pin, and a vacuum block installed in the mold structure of the transmission clamp, resulting in a fast working speed, good product quality, and low manufacturing costs, thereby providing a significant economic effect.

Description

Technology Field

[0001] The present invention relates to a mold structure for an automobile transmission clamp, and more specifically, to an economical mold structure for an automobile transmission clamp in which a cooler, a push pin, and a vacuum block are installed in the mold structure of the transmission clamp, so that the working speed is fast, the product quality is good, and the manufacturing cost is low. 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 iN-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, it frequently experiences poor forming performance.

[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, Registration No. 10-2213306 discloses a support bracket for a transmission, Publication No. 20-2010-0005955 discloses a damper bracket for an automobile suspension system, Registration 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 bubbles forming and breakage occurring at the parting line due to poor flow. The problem to be solved

[0007] Therefore, the present invention was devised to solve the above-mentioned problems, and aims to provide an economical mold structure for an automobile transmission clamp in which a cooler, a push pin, and a vacuum block are installed in the mold structure of the transmission clamp, so that the working speed is fast, the product quality is good, and the manufacturing cost is low. means of solving the problem

[0008] The present invention relates to a mold structure for an automobile transmission clamp. In the mold structure for an automobile transmission clamp, the mold is characterized by having a rectangular cross-section with a large front width and a small rear width, forming coupling holes, having a step formed at the rear, having a vertical cross-section in the upward direction in the shape of a '⊂', having a protrusion formed on the left side, and having an auxiliary gate connected from an auxiliary runner connected to the flange. Effects of the invention

[0009] Therefore, the present invention has a significant economic effect in that a cooler, a push pin, and a vacuum block are installed in the mold structure of a transmission clamp, resulting in faster working speed, better product quality, and lower manufacturing costs. Brief explanation of the drawing

[0010] FIG. 1 is an additional configuration diagram of an auxiliary runner and an overflow in a clamp mold of an automobile transmission according to the present invention. FIG. 2 is a diagram showing the additional connection configuration of an auxiliary runner and an overflow in a clamp mold of an automobile transmission according to the present invention. FIG. 3 is an installation diagram of a jet cooler in a clamp mold of an automobile transmission of the present invention. FIG. 4 is a diagram showing the installation of a push pin in a clamp mold of an automobile transmission according to the present invention. FIG. 5 is a slide core installation diagram in a clamp mold of an automobile transmission of the present invention. FIG. 6 is a diagram showing the installation of an O-ring on the clamp mold ejector pin of the automobile transmission of the present invention. FIG. 7 is an explanatory diagram of the clamp mold auxiliary runner of the automobile transmission of the present invention. FIG. 8 illustrates the elimination of product defects through rapid and balanced solidification by the clamp mold of an automobile transmission according to the present invention. Specific details for implementing the invention

[0011] The present invention relates to a mold structure for an automobile transmission clamp. In the mold structure for an automobile transmission clamp, the mold is formed with a rectangular cross-section having a large front width and a small rear width, with coupling holes (1) formed therein and a step (2) formed at the rear. A protrusion (3) is formed in a vertical cross-section in the upward direction in the shape of a '⊂', and a flange (4) is formed on the left side. An auxiliary gate (31) connected from an auxiliary runner (30) is connected to the flange (4). A mold ejector pin (70) is installed, and an O-ring (71) is coupled to the ejector pin (70).

[0012] In addition, an overflow pipe is connected to one side of the flange, and is connected to an overflow pipe at the right rear and at the rear of the mold to discharge gas and excess molten metal.

[0013] In addition, the above mold ejector pin is installed.

[0014] In addition, the above-mentioned ejector pin is characterized by having an O-ring attached thereto.

[0016] The present invention will be described in detail with reference to the attached drawings as follows. FIG. 1 is a diagram showing the additional configuration of an auxiliary runner and an overflow in the clamp mold of the automobile transmission of the present invention; FIG. 2 is a diagram showing the additional connection configuration of an auxiliary runner and an overflow in the clamp mold of the automobile transmission of the present invention; FIG. 3 is a diagram showing the installation of a jet cooler in the clamp mold of the automobile transmission of the present invention; FIG. 4 is a diagram showing the installation of an ejector pin in the clamp mold of the automobile transmission of the present invention; FIG. 5 is a diagram showing the installation of a slide core in the clamp mold of the automobile transmission of the present invention; FIG. 6 is a diagram showing the installation of an O-ring on the ejector pin of the clamp mold of the automobile transmission of the present invention; FIG. 7 is an explanatory diagram of the auxiliary runner in the clamp mold of the automobile transmission of the present invention; and FIG. 8 is a diagram showing the elimination of product defects through rapid and balanced solidification by the clamp mold of the automobile transmission of the present invention.

[0017] delete

[0018] In the structure of the mold of an automobile transmission clamp, the mold has a rectangular cross-section with a large front width and a small rear width, forming coupling holes (1), a step (2) is formed at the rear, a protrusion (3) is formed in a vertical cross-section in the upward direction in the shape of a '⊂', and a flange (4) is formed on the left side. An auxiliary gate (31) connected from an auxiliary runner (30) is connected to the flange (4), and a mold ejector pin (70) is installed, wherein an O-ring (71) is coupled to the mold ejector pin (70). The casting method of the present invention is as shown in FIGS. 1 and 2.

[0019] Moves to the location of the additional auxiliary runner (30, purple) and OVER FLOW (52, red).

[0020] The thickness of the IN GATE increases from T3 to T3.5mm.

[0021] The bubble defect rate is improved from 30% to 2-3% through improvements in the casting method.

[0022] In the casting process, an ingate refers to the entrance into the internal space of the mold where molten metal ultimately forms the shape of the casting.

[0023] The casting process passes through several paths, such as a sprue (10, sprue) for pouring molten metal, a runner (20, 30) through which the molten metal flows, and a gate (21). The ingate is located at the very end of this path and is connected to the mold cavity (the space where the actual product is made).

[0024] The main function of the ingate is to control the flow rate, and the size and shape of the ingate control the amount and speed of the molten metal flowing into the mold.

[0025] As a quality influence, if the molten metal flows in too quickly, turbulence may occur and bubbles (defects) may form, and if it flows in too slowly, the molten metal may solidify.

[0026] Increasing the thickness of the "IN GATE T3.5mm" for the purpose of increasing the thickness controls the flow rate or flow rate of the molten metal, thereby reducing the rate of bubble formation, which is a casting defect.

[0028] In addition to the present invention, a vacuum block is additionally connected to prevent backflow caused by insufficient vacuum capacity. The conventional chill vent type is replaced with a vacuum block from Fondarex.

[0029] Chill vents are primarily used in the die-casting process to vent gases from inside the mold and prevent molten metal from leaking out.

[0030] The "types" of chill vents are primarily classified according to their structure and material, and integration with a vacuum system is particularly important. The non-vacuum type (C-Block non-vacuum type) is a general form designed solely for gas evacuation.

[0031] When molten metal enters the chill vent gap, it is rapidly cooled and solidified using the high thermal conductivity of the metal to prevent further outflow.

[0032] This type usually has a thin exhaust passage in the shape of a zigzag.

[0034] The vacuum block removes bubbles and voids by using a vacuum system to suck up and remove air or gas that becomes trapped when molten metal is injected into the mold.

[0035] This minimizes the occurrence of internal bubbles (voids) in the final cast product and increases density, significantly improving strength and quality.

[0036] It is particularly essential when producing high-quality structural parts with complex shapes (e.g., automotive chassis parts, engine parts, etc.).

[0037] The vacuum type (C-Block vacuum type) is used in conjunction with vacuum systems from specialized companies such as Fondarex.

[0038] It actively creates a vacuum inside the mold to maximize gas discharge efficiency.

[0039] It rapidly removes gas using vacuum pressure and is designed to prevent molten metal from leaking into the vacuum line even if it flows in.

[0040] Some vacuum-type chill vents have a built-in conformal cooling circuit to induce faster metal solidification.

[0041] delete

[0042] In addition, the present invention adds jet coolers at 4 fixed sides (61) and 6 movable sides (62). (Red marked section) The lifespan of the mold core is extended by improving material adhesion.

[0043] Previously, due to the slow solidification distribution, solidification isolation occurred, resulting in micro-shrinkage and bubble defects, but

[0044] The present invention induces rapid coagulation by adding a JET COLLER.

[0045] The JET COLLER is a device installed outside the casting mold that rapidly lowers the temperature inside the mold by spraying cooling water or the like.

[0046] Specifically, it prevents localized shrinkage and deformation caused by delayed solidification of the product's thick sections, and prevents the shortening of mold life due to temperature imbalances.

[0047] Conventionally, localized sticking occurred due to localized mold surface temperatures (maximum 250~350˚C), but sticking is prevented by adopting the JET COLLER of the present invention.

[0048] delete

[0049] Select the JET COLLER location at the localized heat concentration area.

[0050] And as shown in FIG. 4, the present invention adds nine places (indicated in red) of the push pins (70).

[0051] Conventionally, due to insufficient ejector pin surface area, product deformation and ejector pin operating load

[0052] Pin marks appear on the product. Additionally, deformation occurs due to mold core sticking caused by high temperature and pressure during molten metal filling.

[0053] Therefore, the present invention adds a push pin that takes into account the support area and uneven load through simulation.

[0054] In the prior art, the support area per ejector pin (70) is 2,000 to 5,000 mm², which is an uneven support area, but in the present invention, the support area per ejector pin (70) is 2,800 to 3,200 mm², which is a uniform support area.

[0055] The material's torsional deformation is improved by adding nine ejector pins.

[0056] delete

[0057] The present invention is configured with a die-casting design, a cooling (cooler / chiller) arrangement, a solution for shrinkage defects, and an ejector pin / O-ring (71, see FIG. 6) as technical features.

[0058] Therefore, when vacuum die casting is applied, the hardness of aluminum can increase from 75 to 80 to about 100.

[0059] As shown in FIG. 3 in the present invention, nine coolers are placed at specific locations to solve the problem of shrinkage and heat concentration (hot spot).

[0060] To explain the importance of supplementary design for shrinkage areas (shrinkage occurrence zones), shrinkage defects repeatedly occur in specific areas of a part, and to resolve this, structural modifications such as adjusting the cooler, cooling fins, or gate positions are required.

[0061] Shrinkage is reduced by changing from the existing straight structure to a U-shape, V-shape, etc.

[0062] delete

[0063] And the present invention installs slide cores (80) 2 and 3 as shown in FIG. 5.

[0064] In addition, a vacuum O-ring groove is added to the ejector pin (70) of the movable mold base core pocket. This increases the vacuum capacity by reducing the volume of the vacuum section.

[0065] As shown in FIG. 7, an auxiliary runner (30) is added to the bubble generation section to induce rapid filling. The bubble defect rate is improved from 30% to 2-3%.

[0066] Accordingly, as shown in FIG. 8, the present invention has a cooler, a push pin, and a vacuum block installed in the mold structure of a transmission clamp, so the working speed is fast, the product quality is good, and the manufacturing cost is low, resulting in a significant economic effect.

[0067] delete Explanation of the symbols

[0068] 100 : Mold 10 : Sprue 20 : Main Runner 30 : Auxiliary Runner 21 : Gate (Injection Port) 51 : Existing Overflow 52 : Additional Overflow 41 : Upper Left Overflow (Tube) 42 : Upper Right Overflow (Tube) 61 : Fixed Jet Cooler 62 : Movable Jet Cooler 70 : Ejector Pin 71 : O-ring 80 : Slider Core 80-2, 80-3 : Slide Core 2, 331 : Auxiliary Gate 1 : Connection Hole 2 : Step 3 : '⊂'-shaped Protrusion 4 : Flange

Claims

Claim 1 In the mold structure of an automobile transmission clamp, the mold into which molten metal is injected has a rectangular cross-section with a large front width and a small rear width, forming coupling holes (1), a step (2) is formed at the rear, a protrusion (3) is formed in a vertical cross-section in the upward direction in the shape of a '⊂', and a flange (4) is formed on the left side, and an auxiliary gate (31) connected from an auxiliary runner (30) is connected to the flange (4), and an ejector pin (70) is installed in the mold, and an O-ring (71) is coupled to the ejector pin (70), in the mold structure of an automobile transmission clamp, the molten metal passes through a sprue (10, Sprue) for pouring molten metal, a runner (20, 30) which is a passage for molten metal to flow through, a gate (injection port, 21), and an ingate, and then connects to the mold cavity, which is the space where the actual product is made, and the thickness of the ingate is 3.5mm, and at four fixed locations A mold structure for an automobile transmission clamp characterized by installing a fixed jet cooler (61), movable jet coolers (62) at 6 locations on the movable side, installing 9 locations of ejector pins (70) so that the support area per ejector pin (70) is 2,800~3,200 mm², improving material twisting deformation, and installing slide cores 2 and 3 (80-2, 80-3). Claim 2 delete Claim 3 delete

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