Bottom drill device

Abstract

The utility model relates to a bottoming drill device which comprises a bottoming drill body. The flat bottom drill main body comprises a cutter body (23), a first blade (18) and a second blade (19); the first blade and the second blades are fixed on the cutter body, one side of the cutter body is provided with one first blade and one second blade, the other side of the cutter body is provided with two second blades, the blades on the two sides are distributed at an angle of 180 degrees relative to the cutter body, and the blade on one side is staggered with the blade on the other side after rotating by 180 degrees. According to the utility model, a deep hole flat bottom is carried out by adopting a fusion mode that two polygonal blades are relatively staggered, and the damping centering guide block with excellent damping performance is adopted. The problem that in the machining process of deep holes and large-aperture flat bottoms of metal workpieces, part scrapping is caused by tolerance out-of-tolerance due to too large vibration is solved. And the precision of the metal piece after deep hole flat bottom machining is ensured. The bottoming drill device has the advantages of being high in stability, easy to operate and good in shock resistance. The processing range is wide, and the applicability is high.

Description

Technical Field

[0001] This utility model belongs to the field of machining technology, specifically relating to a flat-bottom drilling device, including a flat-bottom drill and a tool holder, used for flat-bottom rough machining of deep holes in metal workpieces. Background Technology

[0002] Currently, for the processing of thin-walled aluminum cylinder parts, single-piece and small-batch processing all adopt turning to the finished size. However, under the influence of cutting force, clamping force, internal stress and other factors, deformation is easily generated, which fails to meet the requirements of the drawings and ultimately leads to the workpiece being scrapped due to exceeding tolerances and becoming unusable. Utility Model Content

[0003] This utility model provides a flat-bottom drilling device, and the technical problem to be solved is: to solve the problem of excessive vibration during the deep hole flat-bottom machining of metal workpieces, which causes tolerance to exceed the tolerance and leads to the scrapping of parts.

[0004] To solve the above technical problems, this utility model provides a flat-bottomed drill device, characterized in that it includes a flat-bottomed drill body; the flat-bottomed drill body includes a cutter body (23), a first blade (18), and a second blade (19); the first blade (18) and the second blade (19) are fixed on the cutter body (23), one first blade (18) and one second blade (19) are arranged on one side of the cutter body (23), and two second blades (19) are arranged on the other side. The blades on both sides are distributed at 180° relative to the cutter body (23), and the blade on one side is rotated 180° and then staggered from the blade on the other side.

[0005] Furthermore, multiple drainage holes (24) are distributed longitudinally along the chip removal groove of the cutter body.

[0006] Furthermore, the rear end of the blade body (23) is provided with a slot (25), a locking hole (26) and a sealing groove (27), and a sealing ring is embedded in the sealing groove (27).

[0007] Furthermore, a shock-absorbing and centering guide block (21) is fixed on the outer wall of the cutter body (23) for use in conjunction with the inner wall of the workpiece.

[0008] Furthermore, the shock-absorbing centering guide block (21) is made of hard alloy.

[0009] Furthermore, the first blade (18) has no back angle in the circumferential arc, and only the bottom edge has a back angle for guiding; the second blade (19) is used for cutting; the first blade (18) and the second blade (19) are polygonal blades.

[0010] Furthermore, there are multiple drainage holes (24) that are evenly distributed along the chip removal groove.

[0011] Furthermore, it also includes a tool holder, which includes a locking block (28) and a tool holder body (30); the locking block (28) is inserted into the locking groove (25) at the tail end of the tool body (23), the sealing groove (27) at the end of the tool body (23) is embedded in the inner cavity of the tool holder body (30), and is fixed by a fixing bolt (29) passing through the locking hole (26).

[0012] Furthermore, the tail end of the tool holder body (30) is provided with a fixing groove (31).

[0013] Furthermore, the number of the shock-absorbing centering guide blocks (21) is at least two, symmetrically distributed on both sides of the axis of the blade body (23).

[0014] Beneficial effects: This utility model employs a fusion design of two polygonal cutting blades in an interlaced manner for deep hole flat-bottom drilling, and utilizes a shock-absorbing and centering guide block with excellent vibration damping performance. This solves the problem of excessive vibration causing tolerance deviations and resulting in part scrapping during the machining of deep holes and large-diameter flat-bottom drilling of metal workpieces. It ensures the accuracy of metal parts after deep hole flat-bottom drilling. This flat-bottom drilling device has the advantages of high stability, simple operation, and good vibration resistance. It has a wide processing range and strong applicability. Attached Figure Description

[0015] Figure 1 Flat bottom drill diagram

[0016] Figure 2 Tool holder diagram

[0017] Figure 3 Flat bottom processing diagram Detailed Implementation

[0018] To make the purpose, content and advantages of this utility model clearer, the specific embodiments of this utility model will be described in further detail below.

[0019] The present invention proposes a deep hole drilling device, comprising a flat-bottomed drill body and a tool holder;

[0020] The flat bottom drill body includes a first blade (18), a second blade (19), a blade locking bolt (20), a shock-absorbing and centering guide block (21), a locking bolt (22), a drill body (23), a drain hole (24), a slot (25), a locking hole (26), and a sealing groove (27);

[0021] The first blade (18) and the second blade (19) are fixed to the blade body (23) by the blade locking bolt (20). One side of the blade body (23) is provided with one first blade (18) and one second blade (19), and the other side is provided with two second blades (19). The two sides are distributed at 180° with the blade body (23). After the two blades on one side are rotated 180°, they are staggered relative to the two blades on the other side, and the first blade (18) is located on the outermost side. Multiple drainage holes (24) are distributed longitudinally along the chip removal groove of the blade body. The rear end of the blade body is provided with a slot (25), a locking hole (26), and a sealing groove (27). The sealing groove is embedded with a sealing rubber ring for sealing connection with the tool holder. The shock-absorbing and centering guide block (21) is made of hard alloy and is fixed to the outer wall of the blade body (23) by the locking bolt (22) for cooperating with the inner wall of the workpiece to achieve shock absorption, centering and guidance.

[0022] Tool holder: Composed of a locking block (28), a fixing bolt (29), a tool holder body (30), and a fixing groove (31);

[0023] The tool holder block (28) is inserted into the end slot (25) of the tool body (23), the end sealing groove (27) of the tool body (23) is inserted into the inner cavity of the tool holder body (30), and the locking hole (26) of the tool body (10) is fixed by the fixing bolt (29).

[0024] In use, the first insert (18) and the second insert (19) are first fixed to the tool body (23) by insert locking bolts (20). One side of the tool body (23) is distributed with one first insert (18) and one second insert (19), and the two second inserts (19) are distributed on the other side. The two sides are distributed at 180° with the tool body (23). After the two inserts on one side are rotated 180°, they are staggered relative to the two inserts on the other side. This structure can ensure that the position that one side insert cannot turn can be turned by the other side insert when using a standard CNC tool head, so as to achieve a large diameter flat bottom. The multi-insert design can also extend the service life of the overall tool. The design of the two sides can make the cutting force more stable relative to the tool body. After the first insert (18) is installed, there is no back angle in its circumferential arc, so it does not produce a cutting action, but only has a guiding function. The bottom edge is flat. The bottom surface has a rear corner on one side, which, together with the other three second cutting tools (19), can achieve a flat bottom without dead angles or enlarged holes; multiple drainage holes (24) are distributed longitudinally along the chip removal groove of the tool body to accelerate the cooling, lubrication and flushing of the machining position and the tool; the rear end of the tool body (23) is provided with a slot (25), a locking hole (26) and a sealing groove (27), and a sealing ring is embedded in the sealing groove (27) for sealing connection with the tool holder. Since the cutting force generated when the flat bottom drill is flat is large, the addition of the slot (25) and the locking hole (26) to the tool holder can greatly improve the stability and connection strength of the tool body; the shock-absorbing and centering guide block (21) is made of cemented carbide and is fixed on the tool body (23) by the locking bolt (22). Its outer diameter is slightly smaller than the workpiece hole diameter than the axis of the tool body (23). By cooperating with the inner wall of the workpiece, it can achieve the functions of shock absorption, centering and guidance;

[0025] Then insert the tool holder block (28) into the slot (25) at the tail end of the tool body (23), insert the sealing groove (27) at the end of the tool body (23) into the inner cavity of the tool holder body (30), and screw the fixing bolt (29) into the locking hole (26) to complete the fixing of the tool body (23).

[0026] The tool holder is then fixed to the fixture and locked to the front end of the slide plate in the machine tool. After being aligned with the workpiece, machining begins.

[0027] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A flat-bottom drilling device, characterized in that, The invention includes a flat-bottomed drill body; the flat-bottomed drill body includes a cutter body (23), a first blade (18), and a second blade (19); the first blade (18) and the second blade (19) are fixed on the cutter body (23), one first blade (18) and one second blade (19) are provided on one side of the cutter body (23), and two second blades (19) are provided on the other side. The blades on both sides are distributed at 180° relative to the cutter body (23), and the blade on one side is rotated 180° and then staggered from the blade on the other side.

2. The flat-bottom drilling device according to claim 1, characterized in that, Multiple drainage holes (24) are distributed longitudinally along the chip removal groove of the cutter body.

3. The flat-bottom drilling device according to claim 1, characterized in that, The rear end of the blade body (23) is provided with a slot (25), a locking hole (26) and a sealing groove (27), and a sealing ring is embedded in the sealing groove (27).

4. The flat-bottom drilling device according to claim 1, characterized in that, A shock-absorbing and centering guide block (21) is fixed on the outer wall of the cutter body (23) for use in conjunction with the inner wall of the workpiece.

5. The flat-bottom drilling device according to claim 4, characterized in that, The shock-absorbing centering guide block (21) is made of hard alloy.

6. The flat-bottom drilling device according to claim 1, characterized in that, The first blade (18) has no back angle in the circumferential arc, and only the bottom edge has a back angle for guiding; the second blade (19) is used for cutting; the first blade (18) and the second blade (19) are polygonal blades.

7. The flat-bottom drilling device according to claim 2, characterized in that, There are multiple drainage holes (24), which are evenly distributed along the chip removal groove.

8. The flat-bottom drilling apparatus according to any one of claims 1-7, characterized in that, It also includes a tool holder, which includes a locking block (28) and a tool holder body (30); the locking block (28) is inserted into the locking groove (25) at the tail end of the tool body (23), the sealing groove (27) at the end of the tool body (23) is embedded in the inner cavity of the tool holder body (30), and is fixed by passing a fixing bolt (29) through the locking hole (26).

9. The flat-bottom drilling device according to claim 8, characterized in that, The tail end of the tool holder (30) is provided with a fixing groove (31).

10. The flat-bottom drilling device according to claim 4, characterized in that, The number of the shock-absorbing and centering guide blocks (21) is at least two, which are symmetrically distributed on both sides of the axis of the cutter body (23).

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