Processing method of vehicle egr velve

Abstract

The present invention relates to a method for machining a vent hole of an EGR valve for a vehicle, comprising the steps of: inserting a first cutting tool (21) for machining a vent hole (11) through an exhaust gas circulation passage (12) formed in an EGR valve (10), and then rotating the tool to cut the inner wall of the exhaust gas circulation passage (12) so that half of the vent hole (11) is machined by rotating 180° in an arc shape to the right relative to the starting point of machining the vent hole (11); and after half of the vent hole (11) is formed in the right direction, replacing and inserting a second cutting tool (22), the cutting edge direction opposite to that of the first cutting tool (21), into the exhaust gas circulation passage (12), and then rotating the tool to cut the inner wall of the exhaust gas circulation passage (12) so that the tool rotates 180° in an arc shape to the left relative to the starting point of machining the vent hole (11) so that the remaining half The process is performed in a step of machining the vent hole (11) so that no burrs are generated in the vent hole (11), thereby preventing burrs from being generated when machining the vent hole (11) formed in the EGR valve (10), which has the effect of reducing the product defect rate.

Description

Technology Field

[0001] The present invention relates to a method for machining a vent hole formed in a vehicle EGR valve to regulate vacuum pressure and maintain the valve's position. Background Technology

[0003] The exhaust gas recirculation system, also commonly known as EGR (Exhaust Gas Recirculation), reduces nitrogen oxides (NOx) in exhaust gases by recirculating a portion of the exhaust gas back into the intake system to lower the peak temperature during combustion of the mixture, thereby reducing the amount of NOx produced.

[0004] The exhaust gas recirculation system detects the engine's rotational speed (rpm), the temperature of the coolant, and the opening of the throttle valve through the Electronic Control Unit (ECU) installed in the vehicle, and operates the Exhaust Gas Recirculation (EGR) valve. At this time, when the EGR valve opens, the exhaust gas that was being discharged into the exhaust manifold due to the differential pressure between the intake and exhaust is supplied to the combustion chamber through the intake manifold via the exhaust gas recirculation pipe to recirculate the exhaust gas.

[0005] These EGR valves have vent holes formed to regulate vacuum pressure when the EGR valve opens or closes according to the vehicle's engine operating conditions, thereby keeping the valve in the appropriate position. However, the vent holes are located on the inside of the valve, making them difficult to machine, and there is a problem with burrs forming in the vent holes during machining. Prior art literature

[0007] Korean Registered Patent No. 10-2656873 'Method for Manufacturing EGR Valve Housing' The problem to be solved

[0008] Therefore, the objective of the present invention is to provide a bend hole machining method that prevents the generation of burrs during the machining of a bend hole formed in an EGR valve. means of solving the problem

[0010] The present invention, according to the above purpose, relates to a method for machining a vent hole of an EGR valve for a vehicle, comprising the steps of: inserting a first cutting tool (21) for machining a vent hole (11) into the exhaust gas circulation passage (12) formed in the EGR valve (10) through the exhaust gas circulation passage (12) and rotating it to machine the inner wall of the exhaust gas circulation passage (12) so that half of the vent hole (11) is machined by rotating it in an arc shape 180° in one direction relative to the starting point of machining the vent hole (11); and after half of the vent hole (11) is formed in one direction, replacing and inserting a second cutting tool (22), which has a cutting edge direction opposite to that of the first cutting tool (21), into the exhaust gas circulation passage (12) and rotating it to machine the inner wall of the exhaust gas circulation passage (12) so that the The method is characterized by forming the remaining half of the vent hole (11) by rotating it in an arc shape 180° in the opposite direction from the starting point of processing the vent hole (11), thereby dividing the entire circumference of the vent hole (11) by two cutting processes with opposite processing directions, so that no burrs are formed on the edges of the vent hole (11). Effects of the invention

[0012] The present invention has the effect of reducing the product defect rate by preventing burrs from being generated when machining the bend hole formed in the EGR valve. Brief explanation of the drawing

[0014] FIG. 1 is a drawing illustrating the configuration of an EGR valve according to an embodiment of the present invention. FIG. 2 is a cross-sectional view illustrating the configuration of a vent hole formed in an EGR valve according to an embodiment of the present invention. FIGS. 3a and 3b are drawings illustrating a method for machining a vent hole formed in an EGR valve according to an embodiment of the present invention. Figure 4 is a drawing illustrating a conventional method for machining a vent hole. Specific details for implementing the invention

[0015] Preferred embodiments of the present invention will be described in detail below with reference to the attached drawings.

[0016] FIG. 1 is a drawing illustrating the configuration of an EGR valve according to an embodiment of the present invention, FIG. 2 is a cross-sectional view illustrating the shape of a vent hole in detail, and FIG. 3a to FIG. 3b are drawings explaining the method of processing a vent hole formed in an EGR valve.

[0017] The method for machining a vent hole of a vehicle EGR valve according to the present invention comprises the steps of: inserting a first cutting tool (21) for machining a vent hole (11) through an exhaust gas circulation passage (12) formed in an EGR valve (10), and then machining the inner wall of the exhaust gas circulation passage (12) by rotating it to machine 1 / 2 of the vent hole (11) by rotating it 180° in an arc shape to the right relative to the starting point of machining the vent hole (11); and after 1 / 2 of the vent hole (11) is formed in the right direction, replacing and inserting a second cutting tool (22), which has a cutting edge direction opposite to that of the first cutting tool (21), into the exhaust gas circulation passage (12), and then machining the inner wall of the exhaust gas circulation passage (12) by rotating it to machine the remaining 1 / 2 by rotating it 180° in an arc shape to the left relative to the starting point of machining the vent hole (11). The process consists of a step of machining the vent hole (11) so that no burrs are generated in the vent hole (11).

[0018] As shown in FIGS. 1 and 2, a vent hole (11) is formed at the innermost part of the exhaust gas circulation passage (12) of the EGR valve (10), and the vent hole (11) regulates the vacuum pressure of the exhaust gas circulating in the EGR valve (10) so that normal operation can be achieved when the EGR valve (10) opens or closes according to engine operating conditions.

[0019] These vent holes (11) are formed by cutting the inner wall of the narrow exhaust gas circulation passage (12), and if the holes are formed by simply cutting the inner wall, there is a problem of a defect in which a burr is formed on one side of the vent hole (11) as shown in FIG. 4.

[0020] That is, if the cutting tool is rotated in only one direction to form the vent hole (11), a burr is inevitably formed at one end of the hole that the cutting tool processes last, and the burr formed in this way must be removed one by one by hand, which is inconvenient.

[0021] In the present invention, by preventing burrs from being generated during the cutting of the vent hole (11), the secondary processing for removing burrs is reduced, thereby reducing the work process and lowering the manufacturing cost and the defect rate.

[0022] To this end, in the present invention, the first and second cutting tools (21)(22) are alternately inserted into the exhaust gas circulation passage (12), and when machining the vent hole (11), the cutting process is performed by rotating 180° to the right and left respectively relative to the starting point of the machining, thereby dividing it into 1 / 2 portions so that no burrs are generated.

[0023] To explain this, as shown in FIG. 3a, the first cutting tool (21) is inserted into the exhaust gas circulation passage (12) of the EGR valve (10) and rotates, and then rotates 180° in an arc shape relative to the starting point of the process to cut and process the inner wall of the exhaust gas circulation passage (12).

[0024] At this time, half of the vent hole (11) is formed, and as the first cutting tool (21) cuts inward from the open direction of the vent hole (11) toward the exhaust gas circulation passage (12) and rotates in an arc shape, no burrs are generated at the edges of the vent hole.

[0025] After cutting half of the right side of the vent hole (11) with the first cutting tool (21), the first cutting tool (21) is removed from the exhaust gas circulation passage (12), and the second cutting tool (22) is inserted into the exhaust gas circulation passage (12) to cut the remaining vent hole (11).

[0026] Referring to FIG. 3a, the second cutting tool (22) has a cutting edge formed opposite to that of the first cutting tool (21), and rotates 180° in an arc shape with respect to the starting point of processing to cut and process the inner wall of the exhaust gas circulation passage (12).

[0027] Therefore, when processing the vent hole (11), the first and second cutting tools (21) and (22) are each alternately cut in opposite directions, so that no burrs are generated on the edges of the vent hole (11), and accordingly, no separate process for removing burrs is required, and the quality of the product is excellent.

[0029] Although specific embodiments have been described in the foregoing description of the present invention, various modifications may be made without departing from the scope of the present invention. Accordingly, the scope of the present invention should not be determined by the described embodiments but by the claims and equivalents thereof. Explanation of the symbols

[0031] (10)-- EGR valve (11)-- Vent hole (12)-- Exhaust gas circulation passage (21)-- First cutting tool (22)-- Second cutting tool

Claims

Claim 1 In a method for machining a vent hole of a vehicle EGR valve, the method comprises the steps of: inserting a first cutting tool (21) for machining a vent hole (11) into the exhaust gas circulation passage (12) formed in the EGR valve (10) through the exhaust gas circulation passage (12) and rotating it to machine the inner wall of the exhaust gas circulation passage (12) so that half of the vent hole (11) is machined by rotating it 180° in an arc shape in one direction relative to the starting point of machining the vent hole (11); and after half of the vent hole (11) is formed in one direction, inserting a second cutting tool (22), which has a cutting edge direction opposite to that of the first cutting tool (21), into the exhaust gas circulation passage (12) and rotating it to machine the inner wall of the exhaust gas circulation passage (12) so that the vent hole (11) A method for machining a vent hole of a vehicle EGR valve, characterized by machining so that the remaining half of the vent hole (11) is formed by rotating 180° in an arc shape opposite to the one direction based on the starting point of machining, thereby dividing the entire circumference of the vent hole (11) by two cutting processes with opposite machining directions so that no burrs are generated on the edges of the vent hole (11).

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