Drilling sleeve for reaming of metal plate

Abstract

The utility model discloses a drill bushing for metal plate broaching, which relates to the technical field of broaching and comprises a broaching drill bushing, and a positioning ring sleeve is fixedly connected to the center of the top end of the broaching drill bushing. The positioning ring sleeve is communicated with the interior of the reaming drill sleeve; a guide drill rod is mounted in the positioning ring sleeve in a sliding manner; the bottom end of the guiding drill rod extends to the position below the reaming drill sleeve. A plurality of annular drilling tools are annularly, uniformly and fixedly mounted at the bottom end of the reaming drill sleeve; the annular drilling tool is arranged in a triangular cone shape, by designing the shape of the annular drilling tool, the annular drilling tool is made to be thin at the lower portion and thick at the upper portion, and the inner wall of the annular drilling tool is an inclined arc-shaped face, a cut hole material plate can rapidly fall off from the inner wall of the annular drilling tool in the hole expanding process, the hole expanding efficiency of the hole expanding drill sleeve is improved, meanwhile, a cutting tool bit can be exposed in time, and therefore the hole expanding drill sleeve is convenient to use. The influence of accumulation of cut hole material chippings on reaming cutting is prevented, the problem that the tool bit of the annular drilling tool is abraded due to accumulation of the hole material chippings is solved, and the use performance of the reaming drill bushing is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of hole enlarging, in particular to a drill sleeve for enlarging holes in sheet metal. Background Art

[0002] Sheet metal hole enlargement is a common process used in sheet metal processing to enlarge existing holes to the desired size. Drill bushings for sheet metal hole enlargement are important tools in machining technology for improving processing accuracy and efficiency.

[0003] A small-tooth-difference planetary reducer reaming machine disclosed in Chinese patent CN220880605U includes a reaming drill sleeve, an annular push plate, a high-strength cylindrical block and a reinforcing sleeve. A positioning ring is fixed through the middle of the upper end of the reaming drill sleeve, an annular drill cutter is installed on the edge of the lower end of the reaming drill sleeve, a plurality of mounting holes are opened at equal angles on the upper end of the reaming drill sleeve, a plurality of push holes are opened at equal angles on the lower end of the reaming drill sleeve, a plurality of reinforcing sleeves are fixed longitudinally at equal angles inside the reaming drill sleeve, a smooth fixing ring is fixed horizontally in each of the plurality of mounting holes, the annular push plate is slidably sleeved on the annular side of the positioning ring, and a plurality of connecting push rods are installed at equal angles on the lower end of the positioning ring.

[0004] However, the above-mentioned hole reaming machine has the following problems when in use: during the hole reaming process of the annular drill, the debris generated by the cutting in the hole will accumulate at the hole reaming position, affecting the cutting process; and the accumulation of hole material debris will cause the cutter head of the annular drill to wear and the hole reaming position to be uneven.

[0005] In order to solve the above problems, the utility model proposes a drill sleeve for expanding holes in sheet metal. Utility Model Content

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a drill sleeve for sheet metal reaming, comprising a reaming drill sleeve, a positioning ring sleeve fixedly connected to the top center position of the reaming drill sleeve; the positioning ring sleeve is connected to the interior of the reaming drill sleeve; a guide drill rod is slidably installed inside the positioning ring sleeve; the bottom end of the guide drill rod extends to the bottom of the reaming drill sleeve; the bottom end of the reaming drill sleeve is annularly and evenly fixed with multiple annular drill bits; the annular drill bits are triangular cone-shaped; the upper end of the annular drill bit is thicker than the lower end; the thickness of the annular drill bit corresponding to the inner side of the reaming drill sleeve is less than the thickness of the corresponding outer wall side of the reaming drill sleeve.

[0007] Preferably, the annular drill bit is provided with a screw groove; the inside of the screw groove is threadedly connected with a countersunk screw; the annular drill bit is installed on the bottom end of the reaming drill sleeve through the matching bolts of the screw groove and the countersunk screw.

[0008] Preferably, the outer surface of the positioning ring sleeve is provided with a plurality of threaded holes in a ring shape; the inside of the threaded holes are all threadedly connected with fastening screws; the bottom ends of the fastening screws are in contact with the outer wall of the guide drill rod; the guide drill rod is fixed inside the positioning ring sleeve by a plurality of fastening screws.

[0009] Preferably, the bottom end of the guide drill rod is located below the annular drill cutter; the top end of the guide drill rod extends upward out of the interior of the positioning ring sleeve.

[0010] Preferably, the side of the annular drill cutter corresponding to the outer wall of the reaming drill sleeve is arranged as an arc surface; the side of the annular drill cutter corresponding to the outer wall of the reaming drill sleeve and the outer wall of the reaming drill sleeve are located on the same arc surface. Beneficial effects

[0011] Compared with the prior art, the beneficial effects of the present invention are:

[0012] The drill sleeve for sheet metal hole expansion is designed in such a way that the annular drill cutter is thin at the bottom and thick at the top, and the inner wall is an inclined arc surface. Therefore, the cut hole material plate can be quickly dropped off from the inner wall of the annular drill cutter during the hole expansion process, thereby improving the hole expansion efficiency of the reaming drill sleeve. At the same time, the hole material debris can move upward along the inclined arc inner wall, so that the cutting bit is exposed in time, and the accumulation of the cut hole material debris is prevented from affecting the hole expansion cutting, thereby avoiding the problem of the annular drill cutter head being worn or the reaming position being uneven due to the accumulation of the hole material debris, thereby improving the performance of the reaming drill sleeve. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0014] Figure 1 This is a schematic diagram of the overall structure of the utility model;

[0015] Figure 2 This is a schematic diagram of the drill bit fixing structure of the utility model;

[0016] Figure 3 This is a schematic diagram of the structure of the annular drill cutter of the utility model.

[0017] Figure numerals: 1, reaming drill sleeve; 2, annular drill cutter; 3, screw groove; 4, guide drill rod; 5, positioning ring sleeve; 6, fastening screw; 7, countersunk screw. DETAILED DESCRIPTION

[0018] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0019] See also Figure 1-3The utility model provides a technical solution: a drill sleeve for sheet metal reaming, comprising a reaming drill sleeve 1, a positioning ring sleeve 5 is fixedly connected to the top center position of the reaming drill sleeve 1. The positioning ring sleeve 5 is communicated with the interior of the reaming drill sleeve 1.

[0020] A guide drill rod 4 is slidably mounted inside the positioning ring sleeve 5 .

[0021] Specifically, the outer surface of the positioning collar 5 is provided with a plurality of threaded holes in a circular shape. Fastening screws 6 are threadedly connected to the inner surfaces of the threaded holes. The bottom ends of the fastening screws 6 contact the outer wall of the guide drill rod 4. The guide drill rod 4 is fixed in position within the positioning collar 5 by the plurality of fastening screws 6.

[0022] The bottom end of the guide drill rod 4 extends to the bottom of the reaming drill sleeve 1 .

[0023] The bottom end of the reamer sleeve 1 is uniformly and annularly mounted with multiple annular drill bits 2. The annular drill bits 2 are arranged in a triangular pyramidal shape. Specifically, each annular drill bit 2 is provided with a screw groove 3. Countersunk screws 7 are threadedly connected to the interior of each screw groove 3. The annular drill bits 2 are mounted to the bottom end of the reamer sleeve 1 using mating bolts between the screw grooves 3 and the countersunk screws 7.

[0024] The bottom end of the guide drill rod 4 is located below the annular drill cutter 2. The top end of the guide drill rod 4 extends upwards out of the inside of the positioning ring sleeve 5.

[0025] For the convenience of explanation, the side of the annular drill cutter 2 corresponding to the interior of the reaming drill sleeve 1 is the inner side, and the side corresponding to the outer wall of the reaming drill sleeve 1 is the outer side.

[0026] The outer side of the annular drill cutter 2 is arranged as an arc surface. The outer side of the annular drill cutter 2 and the outer wall of the reamer drill sleeve 1 are located on the same arc surface.

[0027] The thickness of the upper end of the annular drill bit 2 is greater than the thickness of the lower end. The thickness of the inner side of the annular drill bit 2 is less than the thickness of the outer side. The inner side of the annular drill bit 2 is arranged as an inclined cambered surface.

[0028] Working principle:

[0029] When in use, the guide drill rod 4 and the positioning ring sleeve 5 are fixedly connected by fastening screws 6. At the same time, the fastening screws 6 can effectively prevent the guide drill rod 4 from axial movement. The upper end of the guide drill rod 4 is fixedly connected to the output end of the rotating device, and the other end of the guide drill rod 4 is inserted into the small hole in the sheet metal. The rotating device is started to rotate the reaming drill sleeve 1 counterclockwise, and the rotating device is pushed downward at the same time to make the guide drill rod 4 move downward along the small hole in the sheet metal. At this time, the annular drill cutter 2 at the bottom of the reaming drill sleeve 1 is close to the surface of the sheet metal.

[0030] When the annular drill 2 cuts the sheet metal, the inclined arc-shaped inner wall structure of the annular drill 2, which is thin at the bottom and thick at the top, can exert a downward force on the cut hole material plate during the hole expansion process, thereby making the cut hole material plate easier to fall off from the inner wall of the annular drill 2. Compared with the drill with a vertical inner wall structure, it can effectively prevent the cut hole material plate from being stuck in the annular drill 2, facilitating the next hole expansion operation, thereby improving the hole expansion efficiency of the hole expansion drill sleeve 1.

[0031] The side of the annular drill cutter 2 corresponding to the interior of the reaming drill sleeve 1 is the inner side, and the side corresponding to the outer wall of the reaming drill sleeve 1 is the outer side; the arc-shaped inner wall of the annular drill cutter 2 is thin on the inner side and thick on the outer side, which can make the hole material debris move upward along the inclined arc-shaped inner wall when the annular drill cutter 2 is cutting, so that the cutting head is exposed in time, and the accumulation of cut hole material debris is prevented from affecting the reaming cutting, avoiding the problem of the cutter head of the annular drill cutter 2 or the uneven reaming due to the accumulation of hole material debris, and can significantly improve the performance of the reaming drill sleeve 1.

[0032] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A drill sleeve for expanding a hole in sheet metal, comprising a drill sleeve (1), characterized in that: A positioning ring sleeve (5) is fixedly connected to the center position of the top end of the reaming drill sleeve (1); the positioning ring sleeve (5) is communicated with the interior of the reaming drill sleeve (1); a guide drill rod (4) is slidably installed inside the positioning ring sleeve (5); the bottom end of the guide drill rod (4) extends to the bottom of the reaming drill sleeve (1); a plurality of annular drill bits (2) are evenly fixedly installed in an annular shape at the bottom end of the reaming drill sleeve (1); the annular drill bits (2) are triangular-conical in shape; the thickness of the upper end of the annular drill bit (2) is greater than the thickness of the lower end; the thickness of the annular drill bit (2) corresponding to the inner side of the reaming drill sleeve (1) is less than the thickness of the outer wall side of the corresponding reaming drill sleeve (1).

2. The drill sleeve for sheet metal hole expansion according to claim 1, characterized in that: The annular drill bit (2) is provided with a screw groove (3); the interior of the screw groove (3) is threadedly connected with a countersunk screw (7); the annular drill bit (2) is mounted on the bottom end of the reaming drill sleeve (1) via a matching bolt between the screw groove (3) and the countersunk screw (7).

3. The drill sleeve for sheet metal hole expansion according to claim 1, characterized in that: The outer surface of the positioning ring sleeve (5) is annularly provided with a plurality of threaded holes; the inside of the threaded holes are all threadedly connected with fastening screws (6); the bottom ends of the fastening screws (6) are in contact with the outer wall of the guide drill rod (4); the guide drill rod (4) is fixed inside the positioning ring sleeve (5) by the plurality of fastening screws (6).

4. The drill sleeve for sheet metal hole expansion according to claim 1, characterized in that: The bottom end of the guide drill rod (4) is located below the annular drill cutter (2); the top end of the guide drill rod (4) extends upward from the interior of the positioning ring sleeve (5).

5. The drill sleeve for sheet metal hole expansion according to claim 1, characterized in that: The side of the annular drill bit (2) corresponding to the outer wall of the reaming drill sleeve (1) is arranged as an arc surface; the side of the annular drill bit (2) corresponding to the outer wall of the reaming drill sleeve (1) and the outer wall of the reaming drill sleeve (1) are located on the same arc surface.

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