Machining centering instrument

Abstract

The utility model relates to machining equipment, in particular to a machining centering instrument for assisting positioning of a machine tool cutter. The utility model relates to a centering instrument, and aims to provide a centering instrument for machining, which can be used for centering cylindrical workpieces and has the characteristics of simple structure and convenience in use. According to the technical scheme, the centering instrument for machining is characterized in that the centering instrument comprises a fixed shaft and a three-legged movable fork hinged to the fixed shaft; the upper end of the fixing shaft is a cylinder, and a first scale line aligned with the axis of the fixing shaft is engraved at the lower end of the fixing shaft; the three-legged movable fork is formed by connecting two measuring legs at the lower part and a proofreading leg at the upper part; a second scale line which can be aligned with the axis of the calibration pin is engraved on the calibration pin; and the second scale line equally divides the included angle between the two measuring feet.

Description

Technical Field

[0001] This utility model relates to machining equipment, specifically a machining centering instrument used to assist in positioning machine tool cutting tools. Background Technology

[0002] In the field of machining, before the cutting tool on the machine tool can process the workpiece, it is necessary to accurately position the machining area of ​​the workpiece to ensure machining accuracy. When machining a regular workpiece plane, conventional measuring instruments can be used to position the machining area of ​​the workpiece.

[0003] When machining cylindrical workpieces, it is often necessary to drill a hole perpendicular to the axis of the cylindrical workpiece. Conventional measuring instruments are difficult to use for centering the cylindrical workpiece before drilling (finding a straight line perpendicular to and intersecting the axis of the machine tool drill chuck). It is quite difficult to make the drilling axis formed by the tool on the drill chuck perpendicular to the axis of the cylindrical workpiece. Utility Model Content

[0004] The purpose of this utility model is to overcome the shortcomings in the above-mentioned background technology and provide a machining centering instrument. This utility model should be able to center cylindrical workpieces and has the characteristics of simple structure and easy use.

[0005] The technical solution of this utility model is:

[0006] A machining centering instrument, characterized in that: the centering instrument includes a fixed shaft and a three-legged movable fork hinged to the fixed shaft; the upper end of the fixed shaft is cylindrical, and the lower end of the fixed shaft is engraved with a first scale line aligned with the axis of the fixed shaft; the three-legged movable fork is formed by connecting two lower measuring legs and one upper calibration leg; the calibration leg is engraved with a second scale line that can be aligned with the axis of the calibration leg; the second scale line bisects the included angle between the two measuring legs.

[0007] The lower end of the fixed shaft is a semi-cylinder; the plane on the semi-cylinder parallel to the axis of the fixed shaft is the mounting surface; the mounting surface is provided with rivet holes for fixing rivets and is engraved with the first scale line.

[0008] The axis of the rivet hole intersects with the first scale line.

[0009] The tripod fork has a hinge hole for hinged to the rivet; the axis of the hinge hole is located at the intersection of the axes of the two measuring feet and the axis of the calibration foot and intersects perpendicularly with the second scale line.

[0010] The length of the calibration foot is less than the length of the semi-cylindrical portion.

[0011] The calibration feet are rectangular strips or semi-cylinders.

[0012] The measuring feet are rectangular strips, cylinders, or semi-cylinders.

[0013] The beneficial effects of this utility model are:

[0014] Using this invention, simply clamp the fixed shaft into the drill chuck of the machine tool, and engage the two measuring feet of the tripod fork with the outer surface of the cylindrical workpiece. Fine-tune the position of the workpiece so that the second scale line on the tripod fork aligns with the first scale line on the fixed shaft to quickly and accurately complete the centering operation. Afterward, the machining centering instrument in the drill chuck can be replaced with a drill bit or other machining tools, and then the cylindrical workpiece can be machined. At the same time, this invention has the characteristics of low cost, simple structure and easy operation while meeting the machining accuracy requirements. Attached Figure Description

[0015] Figure 1 This is the front view of this utility model.

[0016] Figure 2 This is the left view of this utility model.

[0017] Figure 3 This is the working principle of this utility model. Figure 1 .

[0018] Figure 4 This is the working principle of this utility model. Figure 2 .

[0019] Figure 5 This is the working principle of this utility model. Figure 3 .

[0020] Figure label:

[0021] 1. Drill chuck; 2. Fixed shaft; 2. Mounting surface; 2.1. First scale line; 2.2. Tripod movable fork; 3. Measuring foot; 3.2. Calibration foot; 3.1. Second scale line; 3.3. Rivet; 4. Cylindrical workpiece; 5. Fixture; 6. Fine-tuning fixture handwheel; 7. Detailed Implementation

[0022] The present invention will be described in detail below with reference to the embodiments shown in the accompanying drawings.

[0023] The machining centering instrument shown in the figure includes a fixed shaft 2, a tripod movable fork 3, and a rivet 4.

[0024] The upper end of the fixed shaft is a complete cylinder, and the lower end is a semi-cylinder. The upper end of the fixed shaft is clamped into the drill chuck of the machine tool, so that the axis of the fixed shaft coincides with the axis of the drill chuck. The plane on the semi-cylinder portion parallel to the axis of the fixed shaft is the mounting surface 2.1. The mounting surface is engraved with a first scale line 2.2, which coincides with the axis of the fixed shaft. The mounting surface of the semi-cylinder is provided with a riveting hole for fixing a rivet, the diameter of which is 8-12mm, preferably 10mm.

[0025] The tripod fork consists of a shorter upper calibration foot 3.1 and two longer lower measuring feet 3.2 connected together. The calibration foot is preferably a rectangular strip, with the surface in contact with the mounting surface being the inner surface and the surface corresponding to the inner surface being the outer surface. The length of the calibration foot is less than the length of the mounting surface. A second scale line 3.3 is engraved on the outer surface, coinciding with the center line of the outer surface and aligned with the axis of the calibration foot. The distance between the inner and outer surfaces is small to ensure accurate alignment of the first and second scale lines. A hinge hole is provided at the intersection of the calibration foot and the measuring feet, with the diameter of the hinge hole slightly larger than the diameter of the rivet. The axis of the hinge hole is located at the intersection of the axes of the two measuring feet and the axis of the calibration foot, and intersects perpendicularly with the second scale line on the calibration foot. The second scale line bisects the included angle between the two measuring feet (i.e., a1 equals a2). The measuring feet are rectangular strips or cylinders.

[0026] The fixed shaft and the tripod movable fork are hinged by rivets 4. The diameter of the rivets is suitable for the rivet hole and is fixed on the fixed shaft. The diameter of the rivets is slightly smaller than the hinge hole on the tripod movable fork. The tripod movable fork is sleeved on the rivet fixed to the mounting surface through the hinge hole. The tripod movable fork can rotate on the mounting surface, and the center of rotation is the axis of the hinge hole.

[0027] like Figure 3 , Figure 4 As shown, the upper end of the fixed shaft can be inserted into the drill chuck of the lathe for fixation. The axis of the fixed shaft coincides with the axis of the drill chuck, and the axis of the fixed shaft is always vertically downward, which can ensure the accuracy of centering. The cylindrical workpiece 5 is clamped by the fixture 6, and the axis of the cylindrical workpiece is perpendicular to the axis of the fixed shaft. The position of the workpiece can be adjusted by the fine-tuning fixture handwheel 7 on the fixture. When the first scale line of the fixed shaft is aligned with the second scale line on the tripod movable fork, the axis of the drill chuck intersects perpendicularly with the axis of the cylindrical workpiece, and the machining centering instrument completes the centering.

[0028] Working principle:

[0029] 1. Install the fixed shaft of this utility model on the drill chuck of a drilling machine or other machining equipment;

[0030] 2. Next, install the cylindrical workpiece on the fixture, keeping the axis of the cylindrical workpiece horizontal. Then move the fixture so that the cylindrical workpiece is located below the drill chuck of the drilling machine or other machining equipment.

[0031] 3. For example Figure 3 , Figure 4 As shown, the lower drill chuck is pressed down so that the two measuring legs of the three-legged movable fork of the machining centering instrument are on the cylindrical workpiece and in close contact with the outer surface of the cylindrical workpiece.

[0032] 4. Check if the first graduation line on the fixed shaft is aligned with the second graduation line on the tripod. If there is a misalignment, fine-tune the clamp handwheel until the two graduation lines are aligned (e.g., Figure 5 (As shown); Finally, remove the machining centering instrument from the drill chuck, and then install a drill bit or other machining tools on the drill chuck to machine the cylindrical workpiece.

[0033] The accompanying drawings illustrate preferred embodiments of the present invention. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

Claims

1. A machining centering instrument, characterized in that: The centering instrument includes a fixed shaft (2) and a three-legged movable fork (3) hinged to the fixed shaft; the upper end of the fixed shaft is cylindrical, and the lower end of the fixed shaft is engraved with a first scale line (2.2) aligned with the axis of the fixed shaft; the three-legged movable fork is formed by connecting two measuring feet (3.2) at the bottom and one calibration foot (3.1) at the top; the calibration foot is engraved with a second scale line (3.3) that is aligned with the axis of the calibration foot; the second scale line bisects the included angle between the two measuring feet.

2. The machining centering instrument according to claim 1, characterized in that: The lower end of the fixed shaft is a semi-cylinder; the plane on the semi-cylinder parallel to the axis of the fixed shaft is the mounting surface (2.1); the mounting surface is provided with a rivet hole for fixing rivets (4) and is engraved with the first scale line.

3. The machining centering instrument according to claim 2, characterized in that: The axis of the rivet hole intersects with the first scale line.

4. A machining centering instrument according to claim 3, characterized in that: The tripod fork has a hinge hole for hinged to the rivet; the axis of the hinge hole is located at the intersection of the axes of the two measuring feet and the axis of the calibration foot and intersects perpendicularly with the second scale line.

5. A machining centering instrument according to claim 4, characterized in that: The length of the calibration foot is less than the length of the semi-cylindrical portion.

6. A machining centering instrument according to claim 5, characterized in that: The calibration feet are rectangular strips or semi-cylinders.

7. A machining centering instrument according to claim 6, characterized in that: The measuring feet are rectangular strips, cylinders, or semi-cylinders.

8. A machining centering instrument according to claim 7, characterized in that: The diameter of the rivet is 8-12mm.

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