CN114633155A - Grinding explorator and grinding device for twist drill - Google Patents

Abstract

The application discloses a grinding profile and a grinding device for a twist drill. The grinding profile comprises a body, and the body is provided with a drill bit positioning hole extending from a first side to a second side, the first side and the second side are Relatively; in the working state, the drill bit is installed on the drill bit positioning hole and is in a horizontal state, and the angle between the axis of the drill bit and the end face of the grinding wheel is 60°. In the present application, the drill bit can be inserted into the drill bit positioning hole to meet the grinding conditions of the twist drill bit, and the drill bit does not need to be manually adjusted during grinding, thereby ensuring the grinding accuracy.

Description

Grinding profile and grinding device for twist drill

technical field

The present application relates to the technical field of mechanical processing, and more particularly, to a grinding profile and a grinding device of a twist drill.

Background technique

The geometric dimensions of the drill bit of the newly purchased twist drill are "apex angle 2Φ = 118° ± 2°, the relief angle α at the outer circle is 10° to 14°, the chisel edge bevel angle Ψ is 50° to 55°, and the two The flank surface is sharpened and smooth", which is processed by the manufacturer on a standard machine tool, and these geometric dimensions can be guaranteed by the accuracy of the equipment.

After a period of use, the geometric dimensions mentioned above will change. At this time, the twist drill bit has failed, and it needs to be sharpened. The manufacturer will not buy an expensive grinder for sharpening a small amount of twist drill bit. When cutting the machine tool, it is necessary to manually sharpen it. The following is the essentials of sharpening twist drill bits: "The main cutting edge should swing up and down on the grinding wheel, that is, the hand holding the front of the drill bit should swing the drill bit up and down evenly on the grinding wheel surface. The hand holding the handle cannot swing, and It is necessary to prevent the rear shank from rising up, that is, the tail of the drill bit cannot be raised above the horizontal center line of the grinding wheel, otherwise the cutting edge will be blunt and cannot be cut. This is the most critical step. Whether the drill is well ground or not is related to this. It has a lot to do with it. When the grinding is almost done, start from the cutting edge and rub lightly on the back corner to make the back of the blade smoother.”

From "The Essentials of Sharpening Twist Bits", it can be seen that it is not easy to restore the accuracy of a failed twist drill manually. Many people try to restore its accuracy by sharpening, but after sharpening The durability is difficult to compare with new drill bits, and sharpening is finally abandoned, which results in a large number of twist drill bits that have lost precision but still have a long time in the production site, resulting in a lot of waste of resources.

SUMMARY OF THE INVENTION

The present application provides a grinding profile and a grinding device of a twist drill, which can meet the grinding conditions of the twist drill by inserting the drill into the positioning hole of the drill, without manual adjustment of the drill during grinding, thus ensuring the grinding accuracy.

The application provides a grinding profile for a twist drill, including a body, the body is provided with a drill positioning hole extending from a first side to a second side, and the first side is opposite to the second side;

In the working state, the drill bit is installed on the drill bit positioning hole and is in a horizontal state, and the included angle between the axis of the drill bit and the end face of the grinding wheel is 60°.

Preferably, the body is provided with a plurality of drill bit positioning holes with different diameters, and the axes of the plurality of drill bit positioning holes are parallel and located at the same height.

Preferably, the third side surface of the body is provided with a plurality of connecting holes, the third side surface is parallel to the arrangement direction of the plurality of drill bit positioning holes, and the third side surface is perpendicular to the first side surface.

Preferably, the distance between the axis of the drill bit positioning hole and the third side surface is a preset distance.

Preferably, the included angle between the first side surface and the second side surface and the axis of the drill bit positioning hole is 60°.

Preferably, the fourth side surface of the body is parallel to the axis of the drill bit positioning hole, the included angle between the fourth side surface and the first side surface is 60°, and the fourth side surface is perpendicular to the third side surface.

The application also provides a grinding device for a twist drill, including a grinder and a grinding profile;

The grinding machine includes a grinding wheel protective cover and a sharpening frame. The sharpening frame includes a horizontal support rod and a vertical support rod. The horizontal support rod is fixedly connected with the grinding wheel protective cover, and the outer end of the horizontal support rod protrudes from the outer circumference of the working part of the grinding wheel. The vertical support rod extends upward from the outer end of the horizontal support rod, and the upper end of the vertical support rod has the same height as the central axis of the grinding wheel;

The grinding profile is fixed with the upper end of the vertical support rod. The grinding profile comprises a main body. The main body is provided with a drill bit positioning hole extending from the first side to the second side. The drill bit positioning hole extends on the horizontal plane, and the drill bit positioning hole The included angle between the axis of the grinding wheel and the end face of the grinding wheel is 60°; the first side is opposite to the second side.

Preferably, the body is provided with a plurality of drill bit positioning holes with different diameters along the axial direction of the grinding wheel, and the axes of the plurality of drill bit positioning holes are parallel and located at the same height.

Preferably, the bottom surface of the body is provided with a plurality of connecting holes connected with the vertical support rods, and the bottom surface is perpendicular to the first side surface.

Preferably, the included angle between the first side surface and the second side surface and the axis of the drill positioning hole is 60°, and the included angle between the fourth side surface of the body and the first side surface is 60°, and the fourth side surface is perpendicular to the bottom surface.

Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings.

Description of drawings

The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and together with the description serve to explain the principles of the application.

Fig. 1 is the structural diagram of the grinding device of the twist drill provided by the application;

Fig. 2 is the front view of the grinding master mould of the twist drill provided by the application;

Fig. 3 is the left side view of Fig. 2;

Fig. 4 is the bottom view of Fig. 2;

FIG. 5 is a processing flow chart of the grinding profile provided by the present application.

Detailed ways

Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, techniques, methods, and apparatus should be considered part of the specification.

In all examples shown and discussed herein, any specific values should be construed as illustrative only and not limiting. Accordingly, other instances of the exemplary embodiment may have different values.

The present application provides a grinding profile and a grinding device for a twist drill, which can meet the grinding conditions of the twist drill by inserting the drill into the positioning hole of the drill, without manual adjustment of the drill during grinding, thus ensuring the grinding accuracy.

As shown in Figure 1, the grinding device of the twist drill includes a grinder and a grinding profile. The grinding wheel machine includes a grinding wheel motor 5 , grinding wheels 3 at both ends of the grinding wheel motor, and a grinding wheel protective cover 1 and a grinding tool holder 2 on each grinding wheel 3 .

The sharpening frame 2 includes a horizontal support rod 21 and a vertical support rod 22. The horizontal support rod 21 is fixedly connected with the grinding wheel protective cover 1, and the outer end of the horizontal supporting rod 21 protrudes from the working part of the grinding wheel 3 (not covered by the grinding wheel protective cover 1). The outer circumferential surface of the covered part), the vertical support rod 22 extends upward from the outer end of the horizontal support rod 21 , and the upper end of the vertical support rod 22 has the same height as the central axis of the grinding wheel 3 .

As shown in FIGS. 2-4 , the grinding master 4 includes a main body 47 . The main body 47 is provided with a drill positioning hole 46 extending from the first side surface 44 to the second side surface 42 , wherein the first side surface 44 is opposite to the second side surface 42 . .

Preferably, as shown in FIGS. 2-4 , the body 47 is provided with a plurality of drill bit positioning holes 46 with different diameters, and the axes of the plurality of drill bit positioning holes 46 are parallel and located at the same height. Different drill positioning holes are used for grinding twist drills of different sizes. As an example, the grinding master shown in Figure 2-4 is suitable for twist drills with diameters of φ6 series and φ8 series. The most used φ6 series are φ6, φ6.2, φ6.5, φ6.8, φ8 series The most used ones are φ8, φ8.2, φ8.5, φ8.8, so φ6, φ6.2, φ6.5, φ6.8 and φ8, φ8.2, φ8 are processed on a steel plate of corresponding thickness. 5. The hole of φ8.8 can be selected when sharpening the drill bit.

As shown in FIGS. 2-4 , the third side 45 of the main body 47 is provided with a plurality of connecting holes 41 , the third side 45 is parallel to the arrangement direction of the plurality of drill positioning holes 46 , and the third side 45 is perpendicular to the first side 44 and the second side 42. The distance between the axis of the drill bit positioning hole 46 and the third side surface 45 is a preset distance 48 . Please refer to FIG. 1 , after the grinding master 4 is installed on the vertical support rod 22, the preset distance 48 is the height difference between the axis of the drill bit positioning hole 46 and the center line of the grinding wheel 3, and the preset distance 48 makes the grinding master The mold itself has a certain thickness, which ensures the clearance angle of the twist drill bit when sharpening, so it is not necessary to consider whether the center line of the twist drill bit is higher than the center line of the grinding wheel 3 and whether the shank of the twist drill bit is low when sharpening. on the cutting edge requirements.

As shown in FIG. 2 , the included angle between the first side surface 44 and the second side surface 42 and the axis of the drill bit positioning hole 46 is 60°.

As shown in FIGS. 2-4 , the fourth side 43 of the main body 47 is parallel to the axis of the drill bit positioning hole 46 , the angle between the fourth side 43 and the first side 44 and the second side 42 is 60°, and the fourth side 43 Perpendicular to the third side surface 45 .

As shown in FIG. 5, when processing and grinding the master mold 4, firstly, a plurality of connecting holes 41 (multiple connecting holes) are processed on the third side of a square and certain thickness steel plate 49 (the drill positioning hole 46 has been machined). The arrangement direction of the drill bit is 60° with the arrangement direction of the positioning holes of the drill bits), forming the left part, and then processing the first side 44 and the second side 42 along the arrangement direction of the connecting hole 41 respectively, such as the middle and right parts, The angle between the first side 44 and the second side 42 and the axis of the drill bit positioning hole 46 is 60°, the third side is perpendicular to the first side 44 and the second side 42, and the fourth side 43 is perpendicular to the first side 44 and the first side 44. The included angle between the two side surfaces 42 is 60°.

The grinding master 4 is fixed to the upper end of the vertical support rod 22 through at least two of the connecting holes 41 . Due to the different distances between the drill positioning holes 46 of different sizes and the end face of the grinding wheel 3 after installation, in order to ensure that the drill positioning holes corresponding to the twist drill to be sharpened can work normally, adjust the The connecting hole 41 is used to move the position of the grinding master 4 relative to the grinding wheel.

As shown in FIG. 1 , after the grinding master is installed, the drill positioning hole 46 extends on the horizontal plane, and the axis of the drill positioning hole 46 and the fourth side surface 43 are both at an angle of 60° with the end surface of the grinding wheel. The third side surface 45 For grinding the bottom surface of the master 4, the first side 44 and the second side 42 are vertical planes.

When using the grinding device, the operator inserts the twist drill into the corresponding drill positioning hole and contacts the grinding wheel. At this time, the drill is placed horizontally, and the angle between the axis of the drill and the end face of the grinding wheel is 60°. When the twist drill bit is in contact with the grinding wheel, the twist drill bit is continuously rotated. When the geometric size of the twist drill bit reaches the geometric size of the new twist drill bit, the sharpening is stopped, and the twist drill bit is removed from the grinding die.

The grinding device of the present application is safe, fast, convenient and simple to operate, and is not affected by the sharpening experience of the operator, and can well sharpen the expired twist drill bit to the geometric size of a new twist drill bit.

Although some specific embodiments of the present application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of the present application. Those skilled in the art will appreciate that modifications may be made to the above embodiments without departing from the scope and spirit of the present application. The scope of the application is defined by the appended claims.

Claims (10)

1. The grinding explorator of the twist drill is characterized by comprising a body, wherein a drill positioning hole extending from a first side surface to a second side surface is arranged on the body, and the first side surface is opposite to the second side surface;

in a working state, the drill bit is arranged on the drill bit positioning hole and is in a horizontal state, and the included angle between the axis of the drill bit and the end face of the grinding wheel is 60 degrees.

2. The profile of claim 1, wherein the body defines a plurality of drill locator holes of different diameters, the drill locator holes having axes parallel and at the same height.

3. A grinding profile of a twist drill according to claim 2, wherein a plurality of connection holes are provided on a third side of the body, the third side being parallel to the arrangement direction of the plurality of drill location holes, the third side being perpendicular to the first side.

4. The grinding fence of a twist drill according to claim 3, wherein the distance between the axis of the drill locating hole and the third side is a predetermined distance.

5. A profile for grinding a twist drill according to claim 3, wherein the first and second side surfaces are angled at 60 ° to the axis of the drill locating hole.

6. The grinding fence of a twist drill according to claim 5, wherein a fourth side of the body is parallel to the axis of the drill positioning hole, the fourth side is at an angle of 60 ° to the first side, and the fourth side is perpendicular to the third side.

7. The grinding device of the twist drill is characterized by comprising a grinding machine and a grinding explorator;

the grinding machine comprises a grinding wheel protective cover and a grinding tool rest, the grinding tool rest comprises a horizontal supporting rod and a vertical supporting rod, the horizontal supporting rod is fixedly connected with the grinding wheel protective cover, the outer end of the horizontal supporting rod protrudes out of the outer circumferential surface of the working part of the grinding wheel, the vertical supporting rod extends upwards from the outer end of the horizontal supporting rod, and the height of the upper end of the vertical supporting rod is the same as that of the central axis of the grinding wheel;

the grinding explorator is fixed with the upper end of the vertical support rod and comprises a body, a drill bit positioning hole extending from the first side surface to the second side surface is arranged on the body, the drill bit positioning hole extends on the horizontal plane, and the included angle between the axis of the drill bit positioning hole and the end surface of the grinding wheel is 60 degrees; wherein the first side is opposite the second side.

8. The grinding device for twist drill according to claim 7, wherein the body is provided with a plurality of drill positioning holes having different diameters along the axial direction of the grinding wheel, and the axes of the plurality of drill positioning holes are parallel and located at the same height.

9. The apparatus of claim 8 wherein the body has a bottom surface with a plurality of attachment holes for attachment to the vertical support bar, the bottom surface being perpendicular to the first side surface.

10. A grinding apparatus for twist drills according to claim 9, wherein the first and second side surfaces are angled at 60 ° to the axis of the drill locator bore, and a fourth side surface of the body is angled at 60 ° to the first side surface, the fourth side surface being perpendicular to the bottom surface.

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