KR-20260067611-A - APPARATUS FOR MANUFACTURING GROOVE FORMED

KR20260067611AKR 20260067611 AKR20260067611 AKR 20260067611AKR-20260067611-A

Abstract

A groove machining device is disclosed. A groove machining device according to an exemplary embodiment of the disclosed invention is configured to machine a groove of a set depth on the inner circumferential surface of a cylinder bore, and may include: i) a holder fixed on the main spindle of a machining center; ii) a frame installed on the holder so as to be movable relative to the central axis of the holder; iii) a damping block connected to the frame at a set distance through at least one damping part that applies elastic force in the direction of movement of the frame; iv) a mounting block connected to the damping block so as to be swingable in the up and down direction through a joint part; v) an elastic member connected to the lower end of the damping block and the lower end of the mounting block along the direction of movement of the frame at the lower side of the joint part; vi) a motor installed on the upper part of the mounting block and having a motor rotation axis rotatably coupled to a shaft support formed on the lower part of the mounting block; and vii) a cutting tip assembly coupled to the lower end of the motor rotation axis.

Inventors

신재만

Assignees

현대자동차주식회사
기아 주식회사

Dates

Publication Date: 20260513
Application Date: 20241106

Claims (17)

A groove machining device configured to machine a groove of a set depth on the inner circumference surface of a cylinder bore, A holder fixed on the main spindle of a machining center; A frame installed on the holder to enable positional movement with respect to the central axis of the holder; A damping block connected to the frame at a set distance through at least one damping member that applies elastic force in the direction of movement of the frame; A mounting block connected to the above damping block via a joint so as to be swingable in the vertical direction; An elastic member connected along the direction of movement of the frame to the lower end of the damping block and the lower end of the mounting block at the lower side of the joint portion; A motor installed on the upper part of the mounting block, with a motor rotation shaft rotatably coupled to a shaft support formed on the lower part of the mounting block; and A cutting tip assembly coupled to the lower end of the motor rotation shaft; A groove processing device including
In Article 1, A stopper mounted on the upper part of the damping block between the at least one damping part and the joint part to limit the swing rotation range of the mounting block; A groove processing device including additional
In Article 1 or Article 2, Positioning members respectively mounted on the upper and lower portions of the shaft support to contact the inner circumferential surface of the cylinder bore; A groove processing device including additional
In Article 1, The above at least one damping member is, A bolt coupled to the upper part of the damping block and penetrating the lower part of the frame along the direction of movement of the frame, and A damping spring mounted on the bolt between the frame and the damping block, and A nut fastened to the through end of the above bolt A groove processing device including
In Paragraph 4, Spring mounting grooves are formed on mutually facing surfaces of the lower part of the frame and the upper part of the damping block, respectively, and The above damping spring is a groove machining device placed in the spring mounting groove.
In Paragraph 4, The above at least one damping member is, A bearing member mounted in a bolt through-hole formed in the lower part of the frame and the upper part of the damping block, respectively. A groove processing device including additional
In Article 1, The above joint part is, A hinge member fixed to the damping block and hinge-coupled to a hinge joint formed in the mounting block, and A hinge pin coupled to the hinge member and the hinge joint. A groove processing device including
In Article 1, The above elastic member is, A compression spring fixed in a spring connection groove formed on each of the mutually facing surfaces of the lower part of the damping block and the lower part of the mounting block. A groove processing device including
In Article 2, The above stopper is, A ball caster coupled to the damping block to make rolling contact with the mounting block. A groove processing device including
In Paragraph 3, The above position determining member is, Ball casters mounted respectively on the upper and lower parts of the shaft support to make rolling contact with the inner circumferential surface of the cylinder bore A groove processing device including
In Paragraph 3, The above position determining member is, Ball springs respectively fastened to the upper and lower parts of the shaft support to make rolling contact with the inner circumferential surface of the cylinder bore. A groove processing device including
In Paragraph 3, The above mounting block includes a motor support formed on the upper side with the shaft support located on the lower side, and The shaft support includes a first part and a second part spaced apart from each other along the vertical direction, A groove processing device in which a support hole for supporting the motor rotation shaft is formed in each of the first part and the second part.
In Article 12, The cutting tip assembly is positioned between the first part and the second part, and The above positioning member is a groove processing device mounted on the first part and the second part, respectively.
In Article 12, A groove machining device in which a shaft bearing supporting the motor rotation shaft is installed in the support hole.
In Paragraph 3, The above cutting tip assembly is, A tip holder coupled to the lower end of the motor rotation shaft, and At least one cutting tip member fixed to the tip holder above A groove processing device including
In Article 15, The above at least one cutting tip member is, A groove machining device positioned to protrude from a virtual line connecting the contact points of the positioning member in the vertical direction, and protruding from a circumferential line with a radius from the center of the motor rotation axis to the virtual line.
In Article 1, A fine positioning unit connected to the holder and the frame to finely adjust the position of the cutting tip assembly relative to the central axis of the holder; A groove processing device including additional

Description

Groove Machining Apparatus {APPARATUS FOR MANUFACTURING GROOVE FORMED} An embodiment of the present invention relates to a manufacturing system for a cylinder bore for an engine, and more specifically, to a groove machining device capable of machining a groove on the inner circumference of a cylinder bore for an engine. Generally, the cylinder bore (or cylinder liner) of an engine obtains a certain level of surface roughness on its inner surface through honing. In this way, the honed cylinder bore has a mesh pattern formed on its inner surface, and through this mesh pattern, an oil film is formed on the inner surface of the cylinder bore, which functions to minimize friction with the piston ring during piston movement. Meanwhile, as piston movement continues, deformation may occur in the mesh pattern of the cylinder bore. This deformation causes oil leakage on the inner surface of the cylinder bore during piston movement, and this oil leakage increases friction between the piston ring and the inner surface of the cylinder bore, which poses a problem of significantly reducing engine efficiency. These problems can be solved by additionally forming a groove (e.g., a groove of 10 μm or less) on the inner circumference of the honed cylinder bore so that oil can be filled. As such, methods for machining grooves on the inner surface of a cylinder bore are generally divided into laser machining and mechanical machining methods. The laser processing method is a method of processing grooves on the inner surface of a cylinder bore using a pulsed laser after honing. This laser processing method has the problem that the equipment for processing is not only expensive but also large in size and volume, making installation difficult, and that it is very difficult to process grooves to a constant depth due to minute changes in the output of the laser beam. The mechanical machining method involves inserting a cutting tool into the honed cylinder bore and then using a cutting tip to physically form a groove on the inner surface of the cylinder bore. In this mechanical machining method, the cutting tip rotates by a motor while the rotation axis of the cutting tool is precisely aligned with the center axis of the cylinder bore, thereby machining a groove of a certain depth on the inner surface of the cylinder bore. Meanwhile, the mechanical machining method of cutting a groove on the inner surface of a cylinder bore using a cutting tip as described above had the disadvantage that, for cylinder bores with various inner diameters, a dedicated tool had to be manufactured for each cutting operation, the structure was complex making manufacturing and repair difficult, and the installation costs were high while control was difficult. To improve this, the applicant disclosed Korean Published Patent Application No. 2022-0046915 (published April 15, 2022). This conventional technology enables a frame to be movably attached to the lower part of the holder through a slot so as to be movable relative to the central axis of the holder, and by configuring a cutting tip for groove cutting on the inner circumference of the cylinder bore by motor drive on the frame, it provides a groove machining device that is easy to manufacture and repair due to its simple configuration, and is low-cost and easy to control, while having versatility for cylinder bores of various inner diameters without the need to manufacture a separate dedicated tool. However, in conventional technology, the inner circumferential surface of a cylinder bore may be machined into a cylindrical shape rather than a perfect circle due to machining deviations. Therefore, in conventional technology, as mentioned above, it is difficult to machine a groove of a certain depth on the inner surface of a cylinder bore that is machined into a cylindrical shape rather than a circle. The matters described in this background technology section are written to enhance understanding of the background of the invention and may include matters that are not prior art already known to those skilled in the art to which this technology belongs. The embodiments of this specification may be better understood by referring to the following description in conjunction with the attached drawings, in which similar reference numerals refer to identical or functionally similar elements. FIG. 1 is a side view illustrating a groove processing device according to an embodiment of the present invention. FIG. 2 is a combined perspective view illustrating the combined structure of a frame and a damping block applied to a groove processing device according to an embodiment of the present invention. FIG. 3 is an exploded perspective view illustrating the combined structure of a frame and a damping block applied to a groove processing device according to an embodiment of the present invention. FIG. 4 is a cross-sectional view illustrating the combined structure of a frame and a damping block applied to a groove processin