A measuring device for resharpening twist drills

Abstract

A kind of measuring device for regrinding twist drill, it is related to machining tool technical field, including base, vertically fixed with L-shaped identification board on the base, the L-shaped identification board is opened with a round hole, a hollow sleeve is fixedly passed through in the round hole, a metal sliding rod is slidably sleeved in the sleeve, the outer circumferential wall of the sleeve is provided with locking screw for locking metal sliding rod, the circumferential wall of one end of the metal sliding rod is obliquely provided with a positioning nail for fixing twist drill, and the oblique direction of the positioning nail is towards L-shaped identification board.The utility model has the advantages of simple structure, low cost, the quick detection and adjustment of blade tip height are realized by mechanical structure, and regrinding precision and efficiency are significantly improved.

Description

Technical Field

[0001] This utility model relates to the field of machining tools, specifically to a measuring device for grinding twist drills. Background Technology

[0002] Twist drills are commonly used drilling tools in machining, and their cutting performance directly depends on the geometric parameters of the main cutting edges. The two main cutting edges of a twist drill must be symmetrical and have the same tip height; otherwise, uneven force will occur during drilling, resulting in problems such as rough hole walls, hole diameter deviation, or even drill breakage.

[0003] Traditional grinding methods mainly rely on the operator's visual inspection or the use of simple tools such as calipers to compare the height of the cutting edge, which has the following drawbacks: ① Insufficient precision: It is difficult to accurately judge the height difference at the micrometer level with the naked eye, resulting in grinding precision that cannot meet the requirements of high-precision machining; ② Low efficiency: Repeated grinding and measurement are required, which is cumbersome and time-consuming, reducing production efficiency; ③ Lack of standardization: The operation process depends on the operator's experience, making it difficult to ensure the consistency and repeatability of grinding results.

[0004] Existing technical solutions are limited; some rely solely on fixing the drill bit angle for regrinding, failing to effectively address the issue of accurate cutting tip height measurement. Other technologies propose using laser projection to detect cutting tip height, but these suffer from high costs and complex operation, hindering widespread industrial application. Therefore, there is an urgent need to develop a device that is simple in structure, low in cost, and capable of quickly and accurately detecting cutting tip height to meet the demands for efficient and standardized regrinding. Utility Model Content

[0005] The purpose of this invention is to provide a measuring device for grinding twist drills, which achieves rapid detection and adjustment of the cutting tip height through a mechanical structure, thereby solving the problems of low accuracy and low efficiency of manual visual inspection in the prior art.

[0006] The technical solution adopted by this utility model to solve the above-mentioned technical problems is: a measuring device for grinding twist drills, including a base, an L-shaped marking plate vertically fixed on the base, a circular hole in the L-shaped marking plate, a hollow sleeve passing through the circular hole, a metal slide rod slidably fitted inside the sleeve, a set screw for locking the metal slide rod on the outer circumferential wall of the sleeve, and a positioning pin for fixing the twist drill inclined on the circumferential wall of one end of the metal slide rod, the inclined direction of the positioning pin facing the L-shaped marking plate.

[0007] As a preferred embodiment, the outer wall of the sleeve is provided with a threaded hole that is compatible with the set screw.

[0008] As a preferred embodiment, a keyway is formed on the outer wall of the metal slide bar along the axial direction, and the end of the set screw is inserted into the keyway after being screwed into the threaded hole of the sleeve to lock the metal slide bar.

[0009] As a preferred embodiment, the L-shaped marking plate has scale lines on the surface facing the positioning nail.

[0010] As a preferred embodiment, the contact surface between the sleeve and the metal slide bar is coated with a lubricating layer.

[0011] As a preferred embodiment, the outer diameter of the sleeve is adapted to the radius of the circular hole on the L-shaped marking plate, and the sleeve and the L-shaped marking plate are fixed by welding.

[0012] Based on the above technical solution, the beneficial effects of this utility model are:

[0013] 1. In terms of accuracy, this application achieves a measurement accuracy of 0.05mm through arc overlap detection, providing strong support for high-requirement operations; in terms of operation, it eliminates the need for complex equipment, allowing a single person to complete the inspection and grinding process, greatly improving work efficiency.

[0014] 2. This application has a simple structure and is entirely mechanical, which greatly reduces manufacturing costs. It is also highly versatile and can be adapted to twist drills of different lengths, making it widely applicable and enabling rapid detection and adjustment of the cutting edge height in the field of machining. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a diagram showing the usage state of this utility model;

[0017] Figure 3 for Figure 2 Enlarged view of point A in the twisted drill.

[0018] The markings in the diagram are: 1. Base, 2. L-shaped label plate, 3. Metal slide bar, 31. Keyway, 32. Locating pin, 4. Sleeve, 5. Set screw, 6. Twist drill, 61. Cutting tip, 62. Tapered hole, 63. Main cutting edge generatrix. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0020] The structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and purposes that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0021] It should also be noted that, unless otherwise stated, the terms "upper," "lower," "left," "right," "front end," and "rear end," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Changes or adjustments to their relative relationships, without substantially altering the technical content, should also be considered within the scope of implementation of this utility model.

[0022] like Figure 1 As shown, a measuring device for grinding twist drills includes a base 1 that provides support for the device. An L-shaped marking plate 2 that can stably support the device is vertically fixed on the base 1. The L-shaped marking plate 2 has a circular hole, and a hollow sleeve 4 is fixed through the circular hole. A metal slide bar 3 is slidably fitted inside the sleeve 4. A set screw 5 for locking the metal slide bar 3 is provided on the outer circumferential wall of the sleeve 4. A positioning pin 32 for fixing the twist drill 6 is inclined on one end of the circumferential wall of the metal slide bar 3. The inclined direction of the positioning pin 32 is towards the L-shaped marking plate 2.

[0023] Specifically, the locating pin 32 is inclined towards the side of the L-shaped sign plate 2 to which the hollow sleeve 4 is fixed. In this example, the locating pin 32 is fixed to the L-shaped sign plate 2 by welding.

[0024] The outer wall of the sleeve 4 is provided with a threaded hole that matches the set screw 5. The contact surface between the sleeve 4 and the metal slide bar 3 is coated with a lubricating layer to reduce sliding friction.

[0025] The outer diameter of the sleeve 4 is adapted to the radius of the circular hole on the L-shaped marking plate 2. In this embodiment, the sleeve 4 and the L-shaped marking plate 2 are connected by welding.

[0026] The metal slide bar 3 is provided with a keyway 31. When the set screw 5 is loose, the metal slide bar 3 can slide and adjust its position within the sleeve 4. When the set screw 5 is tightened, its end is embedded in the keyway 31, thereby locking the metal slide bar 3. In this embodiment, the length of the keyway 31 is half the length of the metal slide bar 3, and the metal slide bar 3 can adjust its position according to the length of the twist drill 6 to accommodate twist drills of different specifications.

[0027] In this embodiment, the L-shaped marking plate 2 is fixed to the base 1 by welding. The surface of the L-shaped marking plate facing the positioning nail 32 is provided with scale lines to help quantify the height deviation.

[0028] In this embodiment, the center of the positioning pin 32 and the center of the keyway 31 are on the same straight line.

[0029] The method of using this utility model is as follows: First, drill a tapered hole 62 at the bottom of the twist drill 6 and insert the positioning pin 32 into it; second, insert the metal slide bar 3 into the sleeve 4 and adjust the twist drill 6 to the appropriate position, then tighten the locking screw 5 so that its end is embedded in the keyway 31 of the metal slide bar 3, thereby locking the metal slide bar 3; then, tilt the twist drill 6 and rotate it left and right with the tapered hole 62 as the center, so that the two main cutting edge tips 61 draw arcs on the surface of the L-shaped marking plate 2 respectively, and observe whether the arcs coincide. If there is a deviation, grind the tip 61 of the main cutting edge on the higher side and repeat the above detection steps until the two arcs are completely consistent.

[0030] It should be noted that the above embodiments are only used to illustrate the present utility model, but the present utility model is not limited to the above embodiments. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A measuring device for grinding twist drills, comprising a base (1), characterized in that: An L-shaped label plate (2) is vertically fixed on the base (1). The L-shaped label plate (2) has a round hole, and a hollow sleeve (4) is fixed through the round hole. A metal slide bar (3) is slidably fitted inside the sleeve (4). A set screw (5) for locking the metal slide bar (3) is provided on the outer circumferential wall of the sleeve (4). A positioning pin (32) for fixing a twist drill (6) is inclined on the circumferential wall of one end of the metal slide bar (3). The inclined direction of the positioning pin (32) is towards the L-shaped label plate (2).

2. The measuring device for grinding twist drills according to claim 1, characterized in that: The sleeve (4) has a threaded hole on its outer wall that is compatible with the set screw (5).

3. The measuring device for grinding twist drills according to claim 2, characterized in that: A keyway (31) is provided on the outer wall of the metal slide bar (3) along the axial direction. The end of the set screw (5) is screwed into the threaded hole of the sleeve (4) and then embedded in the keyway (31) to lock the metal slide bar (3).

4. The measuring device for grinding twist drills according to claim 1, characterized in that: The L-shaped marking plate (2) has scale lines on its surface facing the positioning nail (32).

5. A measuring device for grinding twist drills according to claim 1, characterized in that: The contact surface between the sleeve (4) and the metal slide bar (3) is coated with a lubricating layer.

6. The measuring device for grinding twist drills according to claim 1, characterized in that: The outer diameter of the sleeve (4) is adapted to the radius of the circular hole on the L-shaped marking plate (2), and the sleeve (4) and the L-shaped marking plate (2) are fixed by welding.

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