KR20140107006A - Back chamfering tool for hole working - Google Patents

Abstract

The present invention relates to a back chamfering tool for hole processing. The present invention allows a user to easily install the same on a portable power tool to safely carry out back chamfering and facilitates mass production and increases productivity. As a blade of a chamfering cutter protrudes toward the outer circumference by pushing by a shaft, there is no risk of damage to the user even though the blade rotates while being inserted into the power tool. As the inserted depth of the chamfering cutter can be adjusted through an adjusting housing and a stoppering based on the depth of a hole, workpieces having various widths can be processed with the back chamfering tool. When moving the adjusting housing to fit the width of the workpieces, the user can easily carry out back chamfering with correct depth of the hole by using a ruler provided on the outer circumference of a hole insertion guide of a guide block.

Description

{BACK CHAMFERING TOOL FOR HOLE WORKING}

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a hole machining bag machining tool for chamfering the back surface of a hole formed through drilling by an iron plate or a plate material.

In general, hole machining of workpieces such as steel plate or plate is for riveting or bolt jointing of two workpieces, and holes are drilled through twist drills or flat drills.

When a workpiece is drilled using a drill, the upper or lower portion of the hole is left with a residue, such as a chip or a burr, through which the hole is drilled. If a rivet or bolt is inserted into a hole in this state, the chip or burr of the hole will remain in the hole, preventing the rivet or bolt from coming into close contact with the hole and eventually interfering with the rigid joint.

Therefore, when machining such a workpiece, it is usual to further remove the chip or burr of the hole by performing chamfering using a chamfering tool for machining.

Generally, there are many patents for chamfering holes formed in a workpiece. It is common to chamfer the upper end of a hole with a plate-like plate as a reference, and turn the workpiece upside down so that the lower end of the hole comes to the upper end to chamfer the lower end of the hole to be.

However, the upper end portion of the hole can be easily chamfered by drilling a hole in an iron plate, a plate member, or a pipe which can not be turned upside down, but the lower end portion of the hole may not be chamfered. For example, after forming a hole in the upper or lower surface of a plate member in the shape of a cross section, it is easy to chamfer the outer end of the hole, but it is not difficult to chamfer the inner end. Particularly, it is easy to chamfer the outer circumferential end after forming a hole on the outer circumference of one side of the pipe of the cylindrical shape, but it is impossible to chamfer the inner circumferential end by a general chamfering tool.

In order to chamfer the lower end of such holes, there is a " drilling tool with front and rear chamfering " such as that shown in FIG. 1 as disclosed in Korean Utility Model Publication No. 20-2011-0005554. Such a drilling tool may be placed in a spindle of a machine such as a lathe or a milling machine and is not carried out through a computer input, and a very dangerous situation may arise if an operator wishes to perform a chamfering operation manually. In other words, it is not possible to perform the above-described drilling tool in the hole by turning it right or left in the hole, but the drilling tool may be broken and the worker may be damaged or the formed hole may be greatly damaged to be. If the workpiece is mounted on a spindle of a machine tool, the workpiece must be fixed to the fixed jig. However, in the case of a large workpiece or a workpiece having a specific shape, the workpiece can not be mounted on the fixed jig.

In addition, if the number of workpieces is small when performing chamfering after drilling the workpiece, it is possible to perform the chamfering work after drilling. However, since a large number of workpieces are produced under mass production, The longer the work, the lower the productivity and the higher the production cost.

It is an object of the present invention, which has been devised in order to solve the above-mentioned problems, to provide a hole capable of easily chamfering the back surface of a hole by being easily attached to a portable power transmission mechanism, being suitable for mass production, And to provide a machining baggering furring tool.

Other objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments with reference to the accompanying drawings.

In order to achieve the above-mentioned object, the present invention provides a hole machining baggering tool according to the present invention is a tool for machining a hole for a hole machining, the tool having a cylindrical shape with an inner hollow, an outer flange formed in an upper part on an outer circumferential direction, A guide block having a cylindrical shape and a lower portion inserted into the guide block from above and projecting downward from the hole insertion guide and extending in the upper outer circumferential direction, And a pin guide hole is vertically formed on an outer circumferential surface of the other lower end portion facing the fixing tip so that the pin guide hole can pass through the guide pin A guide bush formed thereon, and a semicircular coupling tip extended from one side of the lower side in a cylindrical shape, A guide shaft inserted into the guide bush above the guide block, the lower end of the guide shaft being engaged with the upper end of the fixing tip of the guide bush, the cutter coupling hole being formed in the coupling tip, A cover coupled to the upper outer flange of the guide block, a pin insertion hole formed at an upper portion of the cover, a cutter blade formed at a lower portion of the cover, The pin insertion hole is inserted into the lower end portion of the guide bush along the inner surface of the fixing tip of the bushing, and then the pin insertion hole is engaged with the pin guide hole of the guide bush and the cutter coupling hole of the shaft, When the engaging pin is moved up and down, the chamfering roller is moved up and down along the inner surface of the fixing tip of the guide bush, And a cutter guide which is fixedly coupled to the lower end edge of the inner side of the fixing tip of the guide bush and guides the chamfering caterer so that the cutter blade of the chamfering caterer protrudes in the outer circumferential direction when the chamfering caterter moves downward .

In addition, the upper portion of the shaft is fixedly coupled to a rotary chuck of the portable transmission mechanism. When the rotary chuck is rotated while pressing the transmission mechanism downward, the shaft rotates while downwardly moving while compressing the spring. The guide bush and the chamfering cater rotates together with the cam follower, and the chamfering crawler moves downward together with the downward movement of the shaft, and is guided by the cutter guide so that the cutter blade of the chamfering cater protrudes in the outer circumferential direction, And the lower surface of the hole is chamfered by the cutter blade of the chamfering contactor.

The guide block is inserted into the guide block through a lower portion of the guide block. The inner housing is screwed with the outer peripheral surface of the guide block and is vertically movable. And a stopper ring interposed between the outer flange of the guide block and the adjustment housing to restrain the adjustment housing from moving up and down.

The guide block may include a ruler formed on the outer circumferential surface of the hole inserting guide, and the ruler may be read in accordance with the vertical movement of the regulating housing to perform a backchampering operation according to the depth of the hole. .

The hole machining bag machining tool according to the present invention can be easily installed in a portable power transmission mechanism so that anyone can safely chamfer the back surface of the hole and is suitable for mass production, thereby contributing to improvement in productivity.

Particularly, since the cutter blade of the chamfer linker protrudes in the outer circumferential direction by the pressing operation of the shaft, there is no risk of injuring the operator even if the cutter blade is inserted into the power transmission mechanism and rotated.

In addition, it is possible to adjust the insertion depth of the chamfering caterer according to the depth of the hole through the adjustment housing and the stopper ring, so that it can be applied to various workpiece thicknesses. When the adjustment housing is moved up and down in accordance with the thickness of the workpiece, A ruler is formed on the outer circumferential surface, so that the back-channeling operation can be easily performed to match the depth of the hole.

1 is a side cross-sectional view showing a working process of a back maching tool for hole machining according to the related art,
Fig. 2 is a perspective view showing a first embodiment of a ball machining tool for hole machining according to the present invention,
Fig. 3 is a perspective view showing a state in which the cutter blade of the chamfering caterer protrudes in the outer circumferential direction in accordance with the downward movement of the shaft and the chamfering cater in the embodiment of Fig. 2,
Figure 4 is a side cross-sectional view of the embodiment of Figure 2,
Figure 5 is a side cross-sectional view of the embodiment of Figure 3,
6 is a cross-sectional view showing a guide block in the embodiment of FIG. 4,
FIG. 7 is a cross-sectional view of the guide bush in the embodiment of FIG. 4, rotated 90 degrees with respect to the axial direction,
Fig. 8 is a cross-sectional view of the shaft shown in Fig. 4, rotated 90 degrees with respect to the axial direction,
Fig. 9 is a perspective view showing a chamfering cater in the embodiment of Fig. 2,
Figs. 10 and 11 are side cross-sectional views showing the chamfering process of the embodiment of Fig. 2,
12 is a perspective view showing a second embodiment of a ball machining tool for hole machining according to the present invention,
Fig. 13 is a perspective view showing a state in which the cutter blade of the chamfering caterer protrudes in the outer circumferential direction in accordance with the downward movement of the shaft and the chamfering cater in the embodiment of Fig. 12,
Figs. 14 and 15 are side cross-sectional views showing a chamfering process of the embodiment of Fig. 12,
16 is a perspective view showing a process of moving the adjusting housing and the stopper ring downward from the guide block in the embodiment of FIG. 12,
17 is a side cross-sectional view illustrating the chamfering process after height adjustment by the adjustment housing of FIG.

Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 to 11, the hole machining bag machining tool according to the present invention includes a guide block 100, a guide bush 200, a shaft 300, a spring 400, a cover 500, A cutter guide 600 and a cutter guide 700 and may further include a regulating housing 800 and a stopper ring 900 as shown in FIGS.

As shown in FIGS. 2 to 6, 10 and 11, the guide block 100 is formed in a cylindrical shape with an inner hollow, an outer flange 110 formed in an upper portion on an outer circumference thereof, H, a hole insertion guide 120 is integrally formed so as to extend in a stepped manner at the lower portion thereof. Various components to be described later are attached to the inside of the hollow of the guide block 100, and the cover 500, which will be described later, is coupled to the upper outer flange 110. In addition, the hole inserting guide 120 under the guide block 100 is inserted and seated in the hole H to be chamfered as shown in Figs. 10 and 11.

2 to 5, 7, 10 and 11, the lower portion of the guide bush 200 is inserted into the guide block 100 from the upper side to the lower side of the hole insertion guide 120, And a locking jaw 210 extending in the upper outer circumferential direction is engaged with the stepped surface 130 at the lower inner end of the guide block 100 so as to be rotatable via the bearing B and a semicircular fixing A tip 220 is extended and a pin guide hole 230 is vertically formed on the outer peripheral surface of the other lower end facing the fixing tip 220. 7, the guide bush 200 is a cylindrical member including an upper engaging jaw 210, a lower fixing tip 220, and a pin guide hole 230 on the outer peripheral surface of the lower end. 2 to 5, the guide bush 200 is inserted into the guide block 100 such that the lower portion of the guide bush 200 protrudes below the hole insertion guide 120 of the guide block 100. At this time, the engagement protrusion 210 of the guide bush 200 is coupled to the step surface 130 at the lower end inside the guide block 100 through the bearing B so as to be rotatable. The fixing tip 220 of the guide bush 200 is coupled with a cutter guide 700 to be described later to guide the chamfering cater 600 up and down and limit the downward movement of the shaft 300 to be described later. The pin guide hole 230 of the guide bushing 200 is coupled to the shaft 300 and the chamfering cater 600 through a coupling pin P to guide a vertical movement of the coupling pin P Role.

As shown in FIGS. 2 to 5, 8, 10 and 11, the shaft 300 has a semicylindrical coupling tip 310 extending in a columnar shape at a lower side thereof, The lower end of the coupling tip 310 is engaged with the upper end of the fixing tip 220 of the guide bush 200 and the cutter coupling hole 311 is formed in the coupling tip 310 do. The shaft 300 is fixed to a rotary chuck of a transmission mechanism (not shown) to be described later, and rotates according to the operation of the transmission mechanism. The shaft 300 is inserted into the guide bush 200 and rotated. The coupling tip 310 of the shaft 300 has a semicircular shape like the fixing tip 220 of the guide bush 200 so that the chamfering cater 600 to be described later is engaged. A cutter coupling hole 311 is formed in the coupling tip 310 so as to face the pin guide hole 230 of the guide bush 200 and a pin insertion hole 610 < / RTI > At this time, the guide bush 200, the coupling tip 310 of the shaft 300, and the chamfering cater 600, which will be described later, are coupled to each other through the coupling pin P through the coupling pin P.

The spring 400 is installed inside the guide block 100 as shown in FIGS. 4 and 5, and provides a spring force to push the shaft 300 upward. The spring 400 is shown as a coil spring in the figure but may be provided inside the guide block 100 to provide any spring force so as to provide a spring force to push up the shaft 300 upwardly. The upper end of the spring 400 is supported on the outer periphery of the shaft 300. The lower end of the spring 400 is supported on the upper surface of the engagement protrusion 210 of the guide bush 200. In order to support the upper end of the spring 400 on the outer periphery of the shaft 300, an annular spring retaining piece is provided on the outer periphery of the shaft 300, The spring engaging piece can be fixed to the outer periphery of the shaft 300 through the snap ring.

The cover 500 is coupled to the upper outer flange 110 of the guide block 100 as shown in FIGS. The cover 500 prevents the penetration of foreign matter into the guide block 100 and prevents the guide block 100 from rotating when the rotatable member or other rotational bearing is inserted into the guide block 100 for smooth rotation of the shaft 300. [ As shown in Fig.

2 to 5 and 9 to 11, the chamfer linker 600 is formed with a pin insertion hole 610 at an upper portion thereof, a cutter blade 620 at a lower portion thereof, The pin insertion hole 610 is inserted into the pin guide hole 230 of the guide bush 200 and the shaft 300 And the engaging pins P are moved up and down along the pin guide holes 230 of the guide bushes 200 so that the guide bushes 200 Along the inner surface of the fixing tip 220 of the main body 100. [ The pin insertion hole 610 on the chamfer linker 600 is a hole into which the coupling pin P is inserted as described above and the coupling pin P is inserted through the pin guide hole 230 of the guide bushing 200 And is inserted into the cutter coupling hole 311 formed through the coupling tip 310 of the shaft 300 through the pin insertion hole 610 of the chamfer linker 600. Accordingly, the guide bush 200, the shaft 300, and the chamfering cater 600 are coupled through the coupling pin P, but the coupling pin P is engaged with the pin guide hole 230 of the guide bush 200 So that the chamfering caterpillar 600 is moved up and down together with the engagement pin P. At this time, the shaft 300 is also moved up and down together with the chamfering cater 600 and the engagement pin P along the inside of the guide bushing 200.

That is, the guide bush 200, the shaft 300, the chamfering cater 600 and the coupling pin P are coupled to the rotary chuck of the transmission mechanism with the rotation of the physical shaft 300 And the shaft 300, the chamfering cater 600 and the engaging pin P can be moved up and down along the pin guide hole 230 of the guide bush 200 with reference to the guide bush 200. The cutter blade 620 of the chamfering cater 600 is rotated together with the rotation of the chamfering cater 600 so as to protrude in a circumferential direction through a cutter guide 700 to be described later, The insertion guide 120 is back-packaged with the inserted hole H.

2 to 5, the cutter guide 700 is fixedly coupled to the lower side edge of the inner side of the fixing tip 220 of the guide bush 200, and when the chamfering cater 600 is moved downward, The chamfering cater 600 is guided so that the cutter blade 620 of the cutter 600 protrudes in the outer circumferential direction. As shown in the drawing, the plane shape of the chamfer linker 600 has a semicircular curved surface contacting with the cutter guide 700, so that when the chamfering cater 600 is moved upward, And the chamfering cater 600 is guided by the cutter guide 700 when the chamfering cater 600 is moved downward so that the cutter blade 620 of the chamfering cater 600 protrudes in the outer circumferential direction. The cutter blade 620 is hidden inside the guide bushing 200. When the chamfering cutter 600 is moved downwardly, So that the hole H can be back-chambered.

In order to perform a back-channeling operation on the hole H to be machined, the upper part of the shaft 300 is fixedly coupled to the rotary chuck of the portable transmission mechanism so as to operate the transmission mechanism to perform the back-channeling operation in the hole H. 10 and 11, the upper portion of the shaft 300 is coupled to a rotary chuck of a transmission mechanism (not shown), and the hole insertion guide 120 of the guide block 100 is inserted into the hole H And then the rotary chuck is rotated while the transmission mechanism is pressed downward. Accordingly, the shaft 300 is rotated while downwardly moving the spring 400, and the guide bush 200 and the chamfering cater 600 rotate together with the shaft 300. At this time, the chamfering cater 600 moves downward together with the downward movement of the shaft 300, and the cutter blade 620 of the chamfering cater 600 is protruded in the outer direction by the cutter guide 700 And the lower surface of the hole H is chamfered by the cutter blade 620 of the chamfering cater 600.

10 and 11, when the upper part of the shaft 300 is coupled to the rotary chuck of the transmission mechanism, the hole inserting guide 120 of the guide block 110 is inserted into the hole H . Next, when the transmission mechanism is operated to rotate the rotary chuck and the shaft 300 is pushed downward, the shaft 300 is rotated and moved together with the downward movement. That is, the downward movement of the shaft 300 causes the engagement pin P to move downward along the pin guide hole 230 of the guide bush 200 with the guide bush 200 as a reference. At this time, The shaft 300 and the chamfering cater 600 are coupled together so that the chamfering cater 600 is also moved downward. The cutter blade 620 of the chamfering cater 600 is guided by the cutter guide 700 when the chamferer cater 600 is moved downward. At the same time, the rotational motion of the shaft 300 leads to the rotational movement of the guide bush 200 and the chamfering cater 600 with reference to the guide block 100. When the cutter blade 620 of the chamfering cutter 600 is rotated in a state in which the cutter blade 620 protrudes in the outer circumferential direction, the lower surface of the hole H is back-chamfered by the cutter blade 620.

On the other hand, the depth of the hole H may vary depending on the thickness of the workpiece M such as an iron plate or a plate material. In order to perform the baggering operation according to the depth of the various holes H, The hole machining bag machining tool according to the present invention may further include the adjustment housing 800 and the stopper ring 900.

12 to 17, the adjusting housing 800 is inserted through the lower portion of the guide block 100 in a cylindrical shape, and the inner circumferential surface of the adjusting housing 800 is screwed with the outer circumferential surface of the guide block 100, have. The stopper ring 900 is ring-shaped and screwed to the outer circumferential surface of the guide block 100. The stopper ring 900 is interposed between the outer flange 110 of the guide block 100 and the adjustment housing 800, Thereby restricting the up-and-down movement of the main body 800.

15 and 17, when the hole insertion guide 120 of the guide block 100 is inserted into the hole H, the lower surface of the adjustment housing 800 is fixed to the workpiece M such as an iron plate or a plate, The depth of insertion of the hole inserting guide 120 into the hole H can be adjusted while moving upward and downward in contact with the upper surface. At this time, the stopper ring 900 is pressed against the upper end of the adjustment housing 800 to fix the adjustment housing 800 so as to restrain the adjustment housing 800 from moving up and down. It is also preferable that the rotation locking direction of the threaded engagement of the adjustment housing 800 and the stopper ring 900 with respect to the guide block 100 is opposite to the rotation direction of the shaft 300.

In addition, the worker can easily check the gap between the up and down positions of the adjustment housing 800 according to the depth of the hole H from the outside, so that the convenience of the back-chammering operation can be further improved. 16 and 17, the guide block 100 is formed with a ruler 121 vertically on the outer circumferential surface of the hole insertion guide 120, and when the adjustment housing 800 is moved up and down The ruler 121 may be read and a back-channeling operation may be performed according to the depth of the hole H. When the ruler 121 is formed vertically along the outer circumferential surface of the hole inserting guide 120 of the guide block 100 so that the lower end of the adjusting housing 800 is moved up and down by the ruler 121 ). The operator can easily ascertain how far the adjustment housing 800 has moved up and down and can easily move the adjustment housing 800 up and down in accordance with the thickness of the workpiece M or the depth of the hole H .

As described above, the hole machining baggering tool according to the present invention can be easily installed in a portable power transmission mechanism so that anyone can safely chamfer the back surface of the hole H, and is suitable for mass production, have.

Particularly, since the cutter blade 620 of the chamfer linker 600 protrudes in the outer circumferential direction by the pressing operation of the shaft 300, there is no risk of injuring the operator even if the cutter blade 620 is inserted into the power transmission mechanism and rotated.

The insertion depth of the chamfering cutter 600 can be adjusted according to the depth of the hole H through the adjustment housing 800 and the stopper ring 900 so that it can be applied to the thicknesses of various workpieces M, The scale 120 is formed on the outer circumferential surface of the hole inserting guide 120 of the guide block 100 when the adjusting housing 800 is moved up and down according to the thickness of the hole H, can do.

The embodiments of the present invention described above and shown in the drawings should not be construed as limiting the technical idea of the present invention. The scope of protection of the present invention is limited only by the matters described in the claims, and those skilled in the art will be able to modify the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the scope of the present invention as long as they are obvious to those skilled in the art.

B: Bearing
M: Workpiece
H: hole
P: Coupling pin
100: guide block 110: outer flange
120: Hole inserting guide 121: Ruler
130:
200: guide bush 210: hanging jaw
220: Fixing tip 230: Pin guide ball
300: shaft
310: coupling tip 311: cutter coupling ball
400: spring
500: cover
600: Champer linker
610: Pin insertion hole 620: Cutter blade
700: Cutter guide
800: Adjustable housing
900: Stopper ring

Claims (4)

A guide block having an annular inner flange formed in an outer circumferential direction at an upper portion thereof and a hole insertion guide integrally formed at an upper portion thereof so as to be inserted into a hole to be subjected to a back channeling operation,
A lower portion of the guide block is inserted into the guide block from the upper side to the lower side of the hole inserting guide so as to protrude from the lower side of the guide block, A guide bush having a semicircular fixing tip extended from a lower end thereof and having a pin guide hole vertically formed on an outer circumferential surface of the other lower end facing the fixing tip,
A semicircular coupling tip extends from the lower side of the guide bush, and is inserted into the guide bush above the guide block, the lower end of the coupling tip is engaged with the upper end of the fixing tip of the guide bush, A shaft having a cutter coupling hole formed therethrough,
A spring installed inside the guide block to provide a spring force to push the shaft upward,
A cover coupled to the upper outer flange of the guide block,
A pin insertion hole is formed in an upper portion of the guide bush, a cutter blade is formed in a lower portion thereof, an upper portion is inserted into a lower end portion of the guide bush along the inner surface of the fixed tip of the guide bush, A chamfer linker coupled to the guide pin through a cutter coupling hole of the shaft and vertically moving along the pin tip guide hole of the guide bush when the engagement pin moves up and down along the pin guide hole of the guide bush;
And a cutter guide fixed to the lower end edge of the inner side of the fixing tip of the guide bush and guiding the chamfering caterer so that the cutter blade of the chamfering caterer protrudes in the outer circumferential direction when the chamfering caterter is moved downward Backhoepering tool.
The method according to claim 1,
The upper portion of the shaft is fixedly coupled to a rotary chuck of a portable transmission mechanism,
When the rotary chuck is rotated while pressing the transmission mechanism downward, the shaft rotates while downwardly moving while compressing the spring, and the guide bush and the chamfering cater rotates together with the shaft,
Wherein the chamfering crawler is guided by the cutter guide so that the cutter blade of the chamfering cater protrudes in the outer circumferential direction while being moved downward together with the downward movement of the shaft, Wherein the flange is chamfered.
The method according to claim 1,
The adjusting housing being inserted through a lower portion of the guide block in a cylindrical shape and having an inner circumferential surface screwed with the outer circumferential surface of the guide block and being movable up and down;
Further comprising a stopper ring screwed to the outer circumferential surface of the guide block in a ring shape and interposed between the outer flange of the guide block and the adjustment housing to restrict movement of the adjustment housing in up and down positions. Furling tool.
The method of claim 3,
In the guide block,
Wherein a ruler is formed on the outer circumferential surface of the hole inserting guide and the ruler is read in accordance with the vertical movement of the adjusting housing to perform a back channeling operation according to the depth of the hole, .

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