JPS58192738A - Twist drill grinder - Google Patents

Abstract

PURPOSE:To perform cutting blade grinding, thinning, and relieving angle grinding simultaneously, by providing grinding stones having conical grinding surfaces on two parallel motors, gradually expanding the distance between the centers of the grinding stones with the rotation, and lifting the grinding stones. CONSTITUTION:A chuck body 28, which holds a twist drill W, is fixed to a fixing plate 30, which is supported by a post 29 on a lower table 1 of a main body, so that the body 28 is aligned with the shaft center of a central shaft 11. Right and left groove cams 8, which are symmetrical with respect to the center of the shaft 11, are cut in a cam plate 17. A boss part 24a of a motor mounting table 24, to which each motor 23 is vertically fixed, is slidably attached to the lower surface of a cam 17a. To the upper ends of the output shafts of the motors 23, flat borazan grinding stones 26, whose grinding surfaces are of a conical shape, are fixed. A grinding lever 12 is turned, the distance between the centers of the grinding stones 26 is expanded, the cam plate 17 is lifted at the same time, and the motor 23 is lifted as a unitary body. Thus, the cutting blade grinding, relieving angle grinding, and thinning can be simultaneously performed by the grinding surfaces of the grinding stones 26.

Description

[Detailed description of the invention] The present invention relates to a novel drill grinding machine.

Conventional drill grinding machines are known to use a single grindstone and grind the cutting edge and flank surface by rotating the drill side, or to grind by rotating the grindstone side, each of which has practical use. However, in order to perform flank grinding and thinning, a synthetic movement must be performed, which has the disadvantage of complicating the structure.

The present invention aims to provide a drill grinding machine based on a completely new idea.The present invention aims to provide a drill grinding machine based on a completely new idea. A means provided on a center shaft whose distance can be changed and which can rotate and move up and down at the center of the drill, and which raises the grindstone as the center shaft rotates during grinding, and a minute gap between the grinding wheels on the seven grinding surfaces formed by two grindstones. The invention is characterized in that it is equipped with a means for holding the gap and gradually widening the gap by turning during grinding, and a blade holder that determines the position and angle of the cutting edge when gripping the drill. I will explain it first.

A bracket 2 with a vertical through hole 2& is fixed to the center of the lower base 1 of the main body, and a vertical slide 3 having seven flange 3a at the top is slid only in the axial direction by a detent key 4 through a bearing in the through hole. It is movably fitted. A slide receiver 5 whose lower surface is sloped is fixed to the lower side of the 7 langes 3a of the vertical slide 3, and the bracket 2
The cutout slide 6 is provided in the cutout portion 2a so as to be slidable in the horizontal direction, and is in contact with a cutout slide 6 whose upper surface is sloped in the same direction.
A vertical cam mounting base 7 having two raised protrusions 7g and 7m at two distant positions is fixed to the 7 langes 3 and the upper boss of the vertical slide 6. Projection 7a.

A vertical cam adjustment table 9 is pivotally supported on 7a by a pin 8.8. A vertical cam 10 is fixed to the upper surface of the vertical cam adjustment table 9 concentrically with the vertical slide 3, and a cam surface 10a rising on the outer circumference is formed on the upper surface. The center shaft 11 rotates with a bearing in the vertical through hole 3'b of the vertical slide 6 and can move vertically, and the vertical cam adjustment table 9 and the vertical cam 1
It is inserted through the stupid hole in the center of 0. The base of a grinding lever 12 that rotates the center shaft 11 by the chisel angle of the drill within the range of approximately 90° to 150° is fixed to the center boss portion 11& of the center shaft 11 with a key 16. A horizontal pin 14 is implanted in the protrusion 12& provided opposite to the mounting side, and a cam 7 lower 15 that contacts the cam surface 1Oa of the upper and lower cams 10 is pivotally attached to the horizontal pin 14. Further, the center shaft 11 is supported above the boss 111 by a seven flange 18 integrated with a cam plate 17 so as to be able to rotate and move up and down via a thrust ball bearing needle roller bearing 16, and a rotating plate 19 at the upper end rotates together. The cam plate 17 is fixed by a square hole as shown in FIG.
The support tube 20 is supported at three positions by a slide column 22 which is vertically slidably inserted through a slide ball bearing 21 into a blind hole 20 & which is opened above the column tube 20 established at the `` position. The central shaft 11 is supported so that it can move vertically and smoothly during vertical movement. In addition, the cam plate 17 is a slab [ball bearing needle roller bearing 1
A grooved cam 17a in the shape of a square symmetrical with respect to the center of the center axis 11 is cut out, and this grooved cam 178
is regulated to maintain a minute gap between the grinding surfaces of the two grinding wheels described later, and the distance between the center of the cam surface gradually increases from the center of the central axis 11, and the left and right cam surfaces are formed symmetrically. ing. A boss $24a of a motor mounting base 24 with a motor 23 vertically fixed to the bottom surface of the grooved cam 17IL is slid onto the grooved cam 17IL without any gap, and a rectangular motor slide plate 25, which is wider than the groove width of the grooved cam 17a, is fastened to the top surface. It is slidably clamped against the cam plate 17. , this motor slide plate 2
5 has a long side cut into a turning @ f19, and the groove width is equal to the length of the short side of the motor slide plate 25 and is slidably engaged with a notched groove 19a symmetrical with respect to the central axis 11 without a gap. As the central shaft 11 rotates, the motor 23 integrally rotates, and the center-to-center distance increases slightly along the grooved cam 17&. A flat borazon grinding wheel 26 having the same diameter and having an oblique upper edge and a conical grinding surface is fixed to the upper end of each of the output shafts of the motor 23.
The outer peripheries of both grinding wheels face each other with a minimum distance of 3 mm between their axes, with a slight gap of 0.1 to 3 mm, usually on the verge of contact. The center of this gap coincides with the center of the central axis 11, and the grinding surface forms a V-shape on this fine point. Further, there is a mounting plate 30 on which a chuck body 28 for gripping the drill W is supported by four pillars 29 installed at four locations on the lower base 1 of the body.
It is fixed to be coaxial with the central axis 11.

The chuck body 28 holds four claws 61 that vertically grip the drill W so as to be movable in the radial direction.
A scroll gear '52 is engaged with one tooth 31b on the arm part 31a that protrudes outward at a right angle to the outside of the claw 31, and by rotating the chuck handle 53 fixed to the upper boss part, the four gears are rotated. The claws 31 are simultaneously opened and closed in the same direction and by the same amount. And about 8!1llffi on the top of the claw 61
An auxiliary claw 34 that works when gripping a thicker drill is attached if necessary. In addition, a whetstone 2 is mounted on the upper surface of the rotating plate 19.
A blade holder 7 flange 35 having a horizontal through hole 35a formed toward the center of the central axis 11 is fixed between the blade holder 6 and the blade holder 36. The top surface of the center side of the blade holder 36 is a flat surface 36 for positioning the tip of the drill.
A triangular blade receiving tip 67 is fixed on the upper surface of the tip 67, and one peak of the tip 67 enters the drill W and defines the position of the cutting edge relative to the grindstone. In addition, a compression spring 27 is interposed in a blind hole 361) opened at the rear of the blade receiver 66, and a stop pin 68 passes through one wall of the blade receiver 66 from the blade receiver 7 flange 65 and faces the blind hole 36'b. Therefore, the blade holder 36 is always on.
protrudes toward the drill side. A stopper 69 is installed laterally at the rear end of the blade holder 36, and the protruding position of the blade holder 36 is adjusted by an adjustment bolt 40 of the flange 35 of the blade holder 7. Further, the pin 41 installed above the rear end is in contact with the cam surface of the blade receiving return cam 42 fixed to the mounting plate 30 of the chuck body 28, and when the blade receiving flange 65 rotates together with the rotating plate 19, the pin 41 The blade receiver 36 is retracted outward along the cam surface to prevent interference with the grindstone 26.
Further, the cutting slide 6 is threadedly engaged with a screw shaft 44m of an adjustment handle 44 supported by a bracket 43 on the lower base 1 of the main body, and is slid by turning the adjustment handle 44 to adjust the vertical position of the vertical cam 10. The amount of grinding can be determined by In addition, an eccentric cam 45 is in contact with the lower surface of the upper and lower cam adjustment bases 9 on the side away from the rotating bins 8, 8, and a cam shaft 45a is supported horizontally by a bracket 46, and by rotating an adjustment handle 47 at the tip thereof, By tilting the vertical cam adjustment table 9 and tilting the vertical cam 10, the cam lift amount is changed and the thinning and clearance angle are adjusted. And the adjustment handles 44 and 47 are respectively scaled ^
You can know the fixed amount.

Next, the present invention will be explained in detail. Confirm that the grinding lever 12 is in position A, insert the drill W into the center of the opened claw 61, and rotate the drill W counterclockwise until it hits the blade receiver 36 so that the cutting edge is aligned with the blade receiver tip 37. When it hits, turn the chuck handle 33 and grip the drill W with the claws 61.

Next, align the adjustment handle 47 with the scale and
is tilted to adjust the amount of vertical movement of the cam 7 op 15, that is, the amount of vertical movement of the grindstone, to determine the thinning and relief angle that match the drill diameter. Next, a starting switch (not shown) is turned on to rotate the motor 23 in the same direction. Then, when the grinding lever 12 is turned from the A position to the B position, the center shaft 11
The motors 23 are rotated along the grooved cams 17 and 17 by the rotating rotating plates. As the wheel rotates, the distance between the centers of the grindstones 26, ie, the gap between the grindstones, increases. Further, as the rotating plate 19 rotates, the blade receiver 36 is retracted outward by the pull-back lever 42, and the grinding operation cannot be prevented.
The lower 15 of the cam 7 provided on the protrusion 12a of the upper and lower cams 10
Since the cam plate 17 is along the cam surface 1Oa of the 7 flange 18, as the cam 7 lower 15 is pushed up as the cam 7 rotates and the center shaft 11 is raised, the cam plate 17 to which the 7 flange 18 is fixed is also lifted, and the cam plate 17 is not pried by the strut 22. Rise horizontally and smoothly.

Along with this, the motor 23 also rises together, and the V-shaped grinding surface at the approach point on the outer periphery of the grindstone 26 simultaneously performs cutting edge grinding, corner grinding, and thinning of the tip of the drill. 1 by rotating the grinding lever 12 from the human position to B position.
When the round eye grinding is completed, the grinding lever 12 is returned to the A position again. Then, turn the adjustment handle 4.1 according to the scale to adjust the amount of grinding and perform the grinding again. When the grinding is completed, the grinding lever 12 is returned to the A position, and the chuck handle 33 is turned to remove the drill W. By repeating this operation, the drill can be ground one after another. Note that this embodiment uses a borazone grinding wheel, so dressing is not necessary, but the present invention is not necessarily limited to this.

As described in detail above, in the present invention, flat grinding wheels each having the same conical grinding surface are mounted on two parallel motors, and are rotated around a central axis located in the center between the motors. Since the distance between the grinding wheels is gradually increased and the grinding wheel is raised, cutting edge grinding, thinning, and second corner grinding can be performed simultaneously. In addition, since the movement of the grindstone is simple, the structure is extremely simple, and it is inexpensive, has few failure-prone parts, and is highly durable. Furthermore, the necessary grinding can be done all at once by simply inserting and fixing the drill into the chuck and turning the handle, and anyone including the elderly, women, women, and children can handle it without prior knowledge. It also has a number of features that allow it to perform a wide range of grinding with the Taber Drill Straight Drill without having to replace the chuck.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of the drill grinding machine of the present invention. FIG.
3 is a plan view with the chuck member and grindstone omitted; FIG. 4 is a grooved cam for guiding the motor; and FIG. 5 is a view showing the cutting slide section. 6... Vertical slide 6-... Cut slide 9...
・Vertical cam adjustment table 10... Vertical cam 11... Center shaft 12... Grinding lever 15... Cam 7 lower 17... Cam plate 19... Swivel plate 22
-I-・Slide support 23...Motor 26...
Grindstone 28... Chuck body 31... Jaw
66...Blade holder

Claims (3)

[Claims] (1) A chuck that holds the drill vertically, a center shaft located on the center of the chuck and supported on a shaft so that it can rotate and move up and down, and a center shaft that rotates and moves up and down with the center axis and is parallel to the center axis. Two grinding wheels of the same diameter having a conical grinding surface with a variable center distance on the left and right sides, a rotation drive device for the grinding wheels, and a gap between the seven grinding surfaces formed by the two grinding wheels is maintained at a minute interval. In addition, a first cam member regulates the minute gap so as to gradually widen symmetrically around the center shafts in response to the rotation of the center shaft in the grinding direction, and a first cam member that moves the grindstone up and down as the center shaft rotates. A drill grinding machine comprising two cam members and a blade holder located above the grindstone to define the tip position and angle when gripping the drill and to be retracted as the grindstone rises. (2) The drill grinding machine according to claim 1, wherein the second cam member has a structure in which the amount of cam lift is adjusted by a thinning and clearance angle wire member. (3) The drill grinding machine according to claim 1, wherein the vertical movement amount of the grindstone is adjusted by a grinding amount determining member.