JP2607415B2 - Drill edge grinding machine - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drill bit grinder capable of holding a drill bit when grinding the drill bit and moving the drill bit in accordance with the grinding.

[0002]

2. Description of the Related Art At present, in order to grind a drill bit, it is necessary to employ a great skill in holding the grinder so that the grinder is properly hit and ground. Conventionally, there have been methods such as regular conical grinding, two-stage surface grinding, spiral point grinding, and three-rake grinding as drill tip grinding methods. And other three-dimensional sliding mechanisms had to be provided. Therefore, the handling was complicated and a great deal of skill was required.

[0003] When it is necessary to grind a drill bit, especially re-grinding of a worn drill bit, most of them are inexperienced persons,
In most cases, the work is done by unskilled workers.
In this case, it is difficult to make the drill edge in a complicated shape and obtain accurate surface grinding. Accordingly, at present, machining is carried out with an inaccurate tool in the machining of holes having a considerable ratio of machining, and there is still much room for improvement in terms of hole accuracy, machining efficiency, and tool life. In view of the above, in recent years, various types of improved drill bit grinders have been proposed, and since they require complicated movements, automated drill bit grinders have been proposed.

[0004] However, these proposed drill bit grinders also require trial and error work based on the experience of a skilled person for initial machine setting. This requires skill, and it is almost difficult to properly grind the drill bit, especially the flank, and particularly difficult to grind the conical flank well. From such a point, a drill bit grinder for performing a complicated mechanism and motion control has been proposed in Japanese Patent Application Laid-Open No. 61-95863.
Very expensive equipment.

For example, conventionally, since the edge of a drill is a spiral, the edge of the chisel is not a straight line but a curve that is almost S-shaped. The cutting edge does not deviate from the center. Therefore,
When the [spiral] drill bit accurately grinds the hole, the drill bit wears evenly and the life of the drill bit is extended.
However, since the edge of the shank portion of the drill has an acute angle, burrs are easily formed at the edge of the hole, and if the clearance angle of the drill edge is not uniform, the drill edge of the [helical] shape is further sharpened. Breakage occurs and the surface of the drilled hole becomes uneven.

As described above, in the conventional drill edge grinder, a drill edge grinder for appropriately grinding the rake face and flank of the edge is disclosed, for example, in Japanese Patent Laid-Open No. 57-2114.
No. 61 has been proposed. That is, even an unskilled person can easily and continuously grind efficiently and accurately, and the flank can be grinded easily. However,
It requires a very complicated cam mechanism and a complicated sliding motion, and requires a high cost, so that it cannot be used for a normal drill bit grinding operator.

Further, a method of devising the drilling cutting edge grinding method, to control the movement of the drill cutting edges, for example, JP-63-23
No. 2924. Further, an auxiliary device for grinding, a method of controlling the movement of the drill tip, for example, there are JP-A 60-94261, Also, the device for moving the drill blade in complex devices, for example, JP 57-6
1450, JP-A-57-41153, JP-A-57-11553
No. 138,564, it is described in JP-A-61-265253, in terms of cost, but practically difficult. Japanese Patent Application Laid-Open Nos. Sho 57-41152, Sho 57-118144, Sho 62-15449,
Japanese Utility Model Laid-Open No. 3-44546 has been proposed, but this requires high skill and has not been practical.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has made it possible to easily grind a drill bit without any experience or skill when grinding a drill bit. An object of the present invention is to provide a drill edge grinder. Another object of the present invention is to provide a drill edge grinder that can easily grind a drill edge having a clearance angle surface without requiring experience or skill. A further object of the present invention is to provide a drill edge grinder capable of performing complicated grinding without requiring an oversized machine or mechanism.

[0009]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned technical problems, and comprises: a rotary grinding machine (grinder) driven by a motor mounted on a base; A drill holder device for holding the drill bit at a predetermined angle with the gripper surface with the gripper chuck; and a swing mechanism for swingably supporting the drill holder device; Supports the drill bit such that the drill bit is rotatable in the direction of rotation of the drill bit, and the drill bit is supported such that the center axis in the longitudinal direction of the drill bit is displaced from the center of the swing mechanism by a predetermined distance; And a sliding rotation mechanism for rotating the drill holder device in accordance with the swinging motion of the drill holder device; by the swinging rotation mechanism, the drill holder device is brought into contact with a grinder grinding surface. , When allowed to swing motion, in conjunction with the swinging motion, the drill tip to provide a drill tip grinding machine, characterized by rotating. The swing rotation mechanism includes a gear provided around the drill holder supporting portion, and a linear gear fitted to the gear is slidably provided in a slider groove means capable of sliding up and down. Is rotatably connected to a connecting rod having a fulcrum, and a horizontal supporting rod is rotatably connected to a side of the connecting rod opposite to a point where the connecting rod is connected to the slider groove means.
A mechanism rotatably supported at the fixed point and rotatably coupled to the support rod is preferred. It is preferable that the apparatus further comprises a grinding start position regulating means for regulating the angle and position of the drill holder so that the drill bit is opposed to the grinding surface of the rotary grinding machine at a predetermined angle. It is preferable that the rotation start angle and the rotation angle of the drill bit can be changed by changing the position of the point at which the connecting rod and the horizontal support rod are connected.

[0010]

[Function] The drill edge grinder according to the present invention has the following aspects. That is, when the drill bit is applied at a predetermined angle to the rotating plane of a rotary grinder (grinder) driven by a motor mounted on the base, the drill bit is obliquely applied and the blade is cut. However, it is not sufficient to simply cut the shape of the drill bit into a conical surface.In accordance with the purpose of use of the drill bit, the shape of the bit is changed three-dimensionally, that is, by changing the curved surface so that the appropriate flank is formed. Must be ground. For this reason, drill edge grinding requires experience and skill. On the other hand, using a drill holder device with the drill bit fixed with a chuck, the drill bit is made swingable, and the rocking motion causes the blade tip to start hitting the grinder surface. Is added at an appropriate start time, and has a mechanism for moving the drill bit so that the grinding depth is appropriately increased with the rotation of the oscillating motion.

That is, in the drill holder device according to the present invention, the drill bit support portion can be rotated in the direction of rotation of the drill bit, and the center axis of the drill bit is shifted by a predetermined distance from the center axis of the swing mechanism. It is lowered by d from the center axis so that the drill bit can be fixed. This deviation of d cooperates with the swinging motion and the rotating motion of the drill bit, so that the grinding depth changes. That is, the center axis becomes a swinging motion in which the center axis is displaced, so to speak, a half of the trajectory of the swing motion is used, and along with that, the drill bit rotates and grinding proceeds. is there.

Further, the drill bit supporting portion has a sliding rotation mechanism that rotates as the drill holder device swings, and the drill bit supporting portion, that is, the drill holder device is swung so that the side opposite to the grinder is lowered. When it moves, the drill bit begins to hit the grinder grinding surface,
And the rotation starts. The swinging and rotating mechanism is provided with a gear around a drill holder supporting portion, and a linear gear fitted to the gear is slidably provided in a slider groove means capable of sliding up and down, and the slider groove means has a connection having a fulcrum. A horizontal support rod is rotatably coupled to the rod, opposite to a point where the connecting rod is coupled to the slider groove means, and the horizontal support rod is rotatably supported at a fixed point. This mechanism is rotatably connected to the support rod. That is,
When the drill holder device is swung so that the side opposite to the grinder is lowered, the drill bit at its tip begins to hit the grinder grinding surface from below, and at the same time, the horizontal bar that is slidable on the drill holder device is fixed. The supporting rod that rotates at the point is pushed to the opposite side of the grinder, the lower end of the connecting rod is pushed, the connecting rod rotates about the center of rotation, the upper end of the connecting rod is pushed to the grinder side, and it is fixed rotatably on it The slider groove means that has started to rotate toward the grinder side, at the same time the slider groove means rises up,
The linear gear attached to it rises and the drill bit support starts to rotate clockwise accordingly.

[0013] The drill bit grinding machine of the present invention further comprises a grinding start position restricting means for restricting the angle and position of the drill holder device so that the drill bit faces the grinder grinding surface at a predetermined angle. Can be. The angle and position of the drill holder device are determined for a particular drill bit. The rotation start angle and the rotation angle of the drill bit can be changed by changing the position of the point at which the connecting rod and the horizontal support rod are joined. That is, the time when the pressing of the connecting rod is started can be controlled by changing the connecting point between the connecting rod and the horizontal support rod.

Next, the drill edge grinder of the present invention will be specifically described with reference to examples, but the present invention is not limited thereto.

[0015]

FIG. 1 is a perspective view showing the entirety of a drill bit grinder according to the present invention. 1 is a motor, 2 is a grinder,
Reference numeral 3 denotes a support stand, 4 denotes a support bar rotatably fixed to the swing mechanism base 3, 5 denotes a horizontal support bar connected to the support bar 4, and 6 denotes a support bar connected to the horizontal support bar 5. The connecting rod is connected to the slider rod 9 at point a. Reference numeral 7 denotes a drill holder device base for fixing the drill bit 12, and 8 denotes a drill holder device 12 that moves the drill holder device 7 to move.
Is a grip (handle) for manually pressing the gripper against the plane 21 of the grinder 2, and 9 is a slider groove means. The slide bearing support 11, the linear gear 15, and the gear 14 (see FIG.
(See FIG. 2) via a socket (drill blade support portion) 10 to which the drill blade 12 is fixed. Reference numeral 12 denotes a drill bit or a drill bit device. The drill holder device base 7 is swingably supported by a swing mechanism base 3 with a shaft and roller bearings (not shown).

FIG. 2 is a perspective view seen from the opposite side of FIG. 1 (however, a motor and a grinder are omitted).
The drill bit 12 is, as shown in FIG.
The grinder 2 is ground by being brought into contact with the plane 21 of the grinder 2 driven by the drill.
Is set with the center ring aligned with the drill bit holder 16. Drill edge 1 at the center ring
The drill bit holder 16 holding the holder 2 is inserted into the socket 10 and fixed as shown in FIG. The drill tip 12 is ground while maintaining a predetermined angle with the plane 21 of the grinder 2. This grinding holding angle is determined by the angle of the cone of the drill bit.

The position of the drill holder 16 is determined by a positioning device 13 (see FIG. 2) fixed to the back side of the slider groove means 9 as shown in FIG. The positioning device 13 fixes the drill holder 16 of the drill bit 12 in the socket 10 by operating a magnet after adjusting the position to a grinding position. When the gripping member 8 is manually pushed downward, the rear end of the drill holder device base 7 is lowered, and the drill bit 12 attached to the front end is raised, and is applied to the grinder grinding surface 21 from below.

At the same time, as shown in FIG.
Since only one side of the support rod 4 is fixed to the support base 3, the support rod 4 is pushed in the direction opposite to the grinder direction (the left direction in the drawing), that is, in the right direction, so that the groove on the surface of the drill holder device is formed. The movement is transmitted to the horizontal support bar 5 slidably fitted therein, and the horizontal support bar 5 is also pushed rightward. Thus, the lower part of the pushed connecting rod 6 is also pushed rightward. Since the connecting rod 6 has the supporting point at the point a (23), the upper part of the connecting rod 6 is pushed leftward, that is, in the grinder direction as shown in the figure. Then, the slider groove means 9 is lifted up. For this purpose, a rack bearing 15 (see FIG. 2) integrated with a slide bearing support 11 slidably fixed to the slider bar 9 is lifted up and slid. Due to the upward movement, as shown by the arrow in FIG. 2, the rotary gear 14 rotates clockwise, and rotates the socket 10 and the drill bit 12 fixed to the drill bit holder 16 clockwise. By lowering the handle 8 in parallel with the above-described movement of contact grinding on the grinder 2, the contact surface of the drill bit 12 against the grinding surface of the grinder 2 is rotated and shifted little by little, thereby performing a movement of increasing the grinding depth. be able to.

That is, when lowering the rear end of the drill holder device base 7 to which the drill bit 12 is fixed, the lower end is moved by the slide bearing support 11 fitted in the slider groove 22 of the slider bar 9 by the movement. a rack gear 15 which is connected by a rotary gear 14 rotates in the direction i.e. clockwise as shown. That is, the mechanism in which the drill bit 12 rotates simultaneously has been described. The horizontal support bar 5 is fitted in the groove of the drill holder device base 7 and slides horizontally. Further, the horizontal support bar 5 includes
A projecting bar 26 is provided and pushes the connecting bar 6, and several holes for providing the projecting bar 26 are formed. By changing the position where the projecting bar 26 is inserted, the rotation start angle and the rotation angle of the drill bit 12 are changed. Can be adjusted and controlled to adjust the clearance angle grinding. That is, at the position of the projection bar 26,
The amount by which the slider bar 9 moves is determined,
This is because the angle at which the socket 10 starts rotating and the amount of rotation are determined. Further, a spring 25 is provided at the lower end of the connecting rod 6, and always pulls the lower end of the connecting rod 6 leftward. The socket 10 to which the drill bit holder 16 is fixed is supported on the base 7 by a slidable bolt 27 fitted in the slider groove 22 and a slidable but fixable bolt 28. This bolt 28
Can be adjusted to control the adjustment distance between the drill bit 12 and the grinder 2.

FIGS. 3 and 4 show the relationship between the shape of the drill bit to be ground by the drill bit grinding machine of the present invention, the angle and the position of the grinding contact surface, and explain the principle of the drill bit grinding machine of the present invention. FIG. FIG. 3A is a plan view of two cutting edges 51 attached to the cutting edge of a spiral steel rod 50 and a cutting edge including a cutting surface 52 and a clearance angle surface 53. The surface of the drill bit enters the spiral concave portion 54 from both sides to create a bit in the steel part. The two blades 51 are in principle parallel as shown (i.e., because the helical surfaces are each made parallel).

In order to grind the drill bit, the drill bit 12 must first be gripped with the center ring aligned. Then, as shown in FIG. 3 (b), the blade 51 of the drill bit 12 is placed on the plane 21 of the grinder and ground. That is, in the drill bit grinding machine of the present invention, the handle 8 at the rear of the drill holder device 7 is lowered, and the drill bit 51 is applied to the grinder surface 21 from below. And rotate the grinder 2,
When the cutting surface 51 is ground, but the handle 8 is lowered about the swing center 29 of the drill holder device 7, the drill cutting edge support portions 10, 16 are rotated by the gears 14 and the straight teeth 15, and the drill cutting edge is rotated. Are rotated, and the blade surfaces 51, 52
, But usually, the drill bit 12 is
Since the cutting surface gradually becomes lower than 1 and the clearance angle surface 53 is formed, as will be described in more detail with reference to FIGS. It is something you can do.

FIG. 4 (a) shows the structure of the present invention.
As shown in the figure, a swing mechanism is provided at a distance l from the grinder surface 21 and is shifted from the swing center 29 by d, that is, lowered, and the center axis of the drill bit 12 having a diameter r is set in the drill holder. Since the drill bit 12 is fixed to the device 7, the drill bit 12 is, when viewed from the right side in FIG.
4 is ground along a line drawn with a radius 1; that is, as shown in FIG. 4B, the surface of the drill bit is ground so as to flow to one side. However, this means that the drill tip 12 is
Since the grinding is performed while rotating (see FIG. 4C), such a cross section is not obtained, and the side surface of the cutting edge surface to be ground changes in this way. Therefore, according to the drill edge grinder of the present invention, it is possible to grind the edge having a clearance angle surface without any skill. That is, by appropriately setting the relationship between the distance l between the swing center and the grinder surface, the diameter r of the drill bit, and the deviation d, a drill bit having a suitable shape is automatically obtained. Usually, for a drill bit having a diameter of 45 mm, if l is about 50 mm and d is about 10 mm, a suitable blade tip, that is, a drill bit that has small blade spills and smoothly moves cutting chips can be obtained.

In the drill bit grinding machine of the present invention, the drill bit to be ground is easily aligned with the center ring, easily fixed to the drill holder device, and applied to the grinding machine. By setting the determined deviation d and the separation distance l according to the purpose, it is possible to grind the drill bit which requires skill with relatively easy work.

[0024]

The drill edge grinder of the present invention has the following technical effects by the configuration shown in the drawing. That is, first, there is provided a drill edge grinder that can easily grind a drill edge having a clearance angle surface without requiring experience or skill. Secondly, there is provided a drill edge grinder capable of performing complicated grinding without requiring an oversized machine or mechanism. Third, the drill bit to be ground is easily aligned with the center ring, easily fixed to the drill holder device, fixed to the grinding machine, and can perform the drill bit grinding requiring skill with relatively easy work. Provide a drill edge grinder that can be used.

[Brief description of the drawings]

FIG. 1 is a perspective view illustrating the configuration of an example of a drill bit grinder according to the present invention.

FIG. 2 is a perspective view of the drill bit grinder of FIG. 1 as viewed from the opposite side.

FIG. 3 is an explanatory view illustrating a configuration and a grinding principle of a drill bit to be ground by the drill bit grinding machine of the present invention.

FIG. 4 is an explanatory view illustrating a configuration and a grinding principle of a drill bit to be ground by the drill bit grinding machine of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Grinder drive motor 2 Whetstone (grinder) 4 Support rod 5, 6 Connecting rod 7 Support base (drill holder device) 8 Handle 9 Slider 10 Socket 11 Slide bearing support body 12 Drill blade 13 Positioning device 14 Rotating gear 15 Rack gear 16 Drill holder

Claims (4)

(57) [Claims] 1. A rotary grinding machine (grinder) driven by a motor mounted on a base, and a drill holder for gripping a drill blade tip with a chuck for gripping the drill blade tip at a predetermined angle to the grinder surface. And a swing mechanism for swingably supporting the drill holder device, the drill holder device rotatably supporting the drill bit in the direction of rotation of the drill bit, and a center axis in the length direction of the drill bit. Has a sliding rotary mechanism for supporting the drill bit so that the drill bit is displaced from the center of the rocking mechanism by a predetermined distance, and rotating the drill bit along with the rocking movement of the drill holder device. When the drill holder is oscillated by the rotating mechanism so that the drill holder device is brought into contact with a grinder grinding surface, the drill bit is rotated in conjunction with the oscillating motion. Drill tip grinding machine according to claim Rukoto. 2. The rocking and rotating mechanism according to claim 1, wherein a gear is provided around the drill holder supporting portion, and a linear gear fitted to the gear is slidably provided in slider groove means capable of sliding up and down. The slider groove means is rotatably connected to a connecting rod having a fulcrum, and a horizontal support rod is rotatably connected to a side of the connecting rod opposite to a point at which the slider groove means is connected. 2. The drill bit grinder according to claim 1, wherein the mechanism is rotatably supported at a fixed point and rotatably connected to a support rod. 3. A grinding start position regulating means for regulating an installation angle of the drill holder device and a distance and a position from the grinder so that a drill bit is opposed to a grinding surface of the grinder at a predetermined angle. The drill bit grinder according to claim 1, wherein: 4. The rotation start angle and rotation angle of the drill bit support portion can be changed by changing the position of the point at which the connecting rod and the horizontal support bar are connected. The described drill bit grinding machine.