Hole machining tool facilitating forward and reverse chamfering of hole opening

Abstract

The hole machining tool comprises a tool bar and a chamfering device arranged on the tool bar, the tool bar is provided with a transverse tool bar through hole with the axial direction of the tool bar as the vertical direction, the chamfering device comprises a chamfering blade, an elastic piece, a pressing block and a pressing screw, the chamfering blade is arranged in the tool bar through hole, and the elastic piece is arranged on the tool bar through hole. The surface of the outer wall of the chamfering blade makes contact with the surface of the hole wall of the cutter bar through hole, the cutting edge end of the chamfering blade extends out of the cutter bar through hole, the pressing block is installed in the cutter bar through the compression screw and compresses the first end of the elastic piece, and the second end of the elastic piece is connected with the chamfering blade and enables the chamfering blade to have elastic force close to the cutting edge end. According to the chamfering device, the structure of the chamfering device is simplified, rapid machining and assembling of products are facilitated, and the reliability of the products is improved; and meanwhile, the occupied space of the internal area of the cutter bar is reduced, an axially-through cooling water through hole can be conveniently machined in the cutter bar, and the drill bit cooling function of the composite cutter can be achieved.

Description

Technical Field

[0001] This utility model relates to a hole machining tool, and more particularly to a hole machining tool that facilitates chamfering of the hole opening in both directions. Background Technology

[0002] In the process of machining holes in a workpiece, it is often necessary to chamfer (deburr) both ends of the hole to shape the hole wall into a tapered or arc shape, or to remove burrs from the hole wall end to make it smoother while maintaining its original shape. Chamfering from the end into the hole is called forward chamfering, which is the most common chamfering method. However, for some specially shaped workpieces, one end of the hole is located in a groove, making it impossible to enter the hole from that end and perform forward chamfering on that end. In this case, the chamfering tool must first be pushed into the hole from the end that can be chamfered forward and extend from the end that cannot be chamfered forward. Then, the tool is moved in the opposite direction so that the chamfering edge of the tool chamfers the hole wall at the end that cannot be chamfered forward. This type of chamfering is called reverse chamfering.

[0003] Generally speaking, tools capable of reverse chamfering can also perform forward chamfering. These tools are collectively referred to as forward and reverse chamfering tools. Traditional forward and reverse chamfering tools employ the following chamfering structure: a chamfering device is mounted on the tool holder. The chamfering device includes a compression spring and a push rod installed inside the tool holder. The compression spring applies elastic force to the push rod, and the tip of the push rod abuts against a chamfering insert with a "V" groove that can move perpendicularly to the push rod. This structure has the following drawbacks: not only do the compression spring and push rod occupy a large amount of space, but a corresponding limiting structure is also required to axially limit the compression spring and the chamfering insert. Therefore, the entire chamfering... The numerous and complex components of the device hinder rapid processing and assembly of the product, and the more components there are, the lower the product reliability is likely to be. Furthermore, due to the large number of components, the central portion of the tool holder is almost entirely occupied, making it difficult to achieve a central water flow function within the tool holder. In practical applications, integrating forward and reverse chamfering functions into drilling tools to form a more practical composite tool offers higher production efficiency. This requires the formation of an axial cooling water channel within the tool holder to cool the drill bit at the tool's tip. The aforementioned traditional forward and reverse chamfering tools, due to their numerous chamfering device components and complex structure, struggle to meet this application requirement. Utility Model Content

[0004] The purpose of this invention is to provide a hole-making tool that is simpler, more reliable, and occupies less space, making it easier to chamfer holes in both directions, in order to solve the above problems.

[0005] This utility model achieves the above objectives through the following technical solutions:

[0006] A hole-making tool for facilitating forward and reverse chamfering of the hole opening includes a tool shank and a chamfering device disposed on the tool shank. With the axial direction of the tool shank as vertical, the tool shank has a transverse through-hole. The chamfering device includes a chamfering insert, an elastic plate, a pressure block, and a clamping screw. The chamfering insert is placed within the through-hole of the tool shank, which has a non-circular radial cross-section. The outer surface of the chamfering insert is in contact with the wall surface of the through-hole. The cutting edge of the chamfering insert extends out of the through-hole. The pressure block is installed within the tool shank by the clamping screw and clamps a first end of the elastic plate. The second end of the elastic plate is connected to the chamfering insert, giving the chamfering insert an elastic force that moves towards the cutting edge.

[0007] Preferably, to more reliably limit and elastically push the chamfering blade, and to facilitate machining and rapid assembly, the chamfering blade has a vertical blade through hole near the cutting edge. The tool shank has a countersunk hole on its outer wall above the countersunk hole and away from the cutting edge. The countersunk hole contains a connecting through hole, with one end near the cutting edge connected to the tool shank through hole. The blade through hole communicates with the connecting through hole. A support portion is formed on the tool shank between the tool shank through hole, the countersunk hole, and the connecting through hole. The elastic sheet has a through hole near its first end. A section of the elastic sheet near its second end bends downwards at an angle not less than 90°. The screw of the clamping screw passes through the through hole on the countersunk hole and the through hole on the elastic sheet, and connects to the screw hole on the support portion. The second end of the elastic sheet is placed inside the blade through hole.

[0008] Preferably, in order to facilitate the adjustment of the position of the elastic sheet to achieve the function of adjusting the extension length of the chamfering blade, the through hole of the elastic sheet is a strip-shaped through hole.

[0009] Preferably, to avoid exposing the clamping screw, the through hole on the clamping block is a countersunk hole and the nut of the clamping screw is placed inside the countersunk hole.

[0010] Preferably, in order to achieve both forward and reverse chamfering functions and spiral sliding function in the middle section of the hole (if there is no middle cutting edge, the friction between the cutting edge end and the hole wall will be large, affecting the normal spiral sliding of the chamfering blade in the hole), the end face of the cutting edge end is provided with a middle cutting edge, an upper cutting edge on the upper side, and a lower cutting edge on the lower side.

[0011] Preferably, in order to facilitate processing and achieve better anti-rotation function, the radial cross-section of the tool holder through hole is rectangular.

[0012] Preferably, in order to improve the smoothness of chamfering in both directions, a countersunk hole is provided on the outer periphery of the end wall of the tool holder through hole corresponding to the cutting edge end.

[0013] Preferably, depending on actual needs, the chamfering device is located on the tool holder near the lower end, and the lower end of the tool holder has no drill bit or has a drill bit.

[0014] The beneficial effects of this utility model are as follows:

[0015] This invention installs an elastic plate inside the tool holder via a pressure block and a clamping screw, connecting it to the chamfering insert. The elasticity of the plate provides both elastic retention and limiting functions for the chamfering insert, eliminating the need for other limiting structures. This reduces the number of components in the chamfering device, simplifies its structure, facilitates rapid processing and assembly, and improves product reliability. Furthermore, since both the elastic plate and the pressure block are located on one side of the chamfering insert, it reduces the space occupied within the tool holder, allowing for the machining of axially penetrating cooling water through-holes. This meets the processing requirements of composite tools that integrate forward and reverse chamfering functions into drilling tools, enabling drill bit cooling and improving production efficiency. Attached Figure Description

[0016] Figure 1 This is one of the main views of the hole machining tool that facilitates forward and reverse chamfering of the hole opening as described in this utility model;

[0017] Figure 2 yes Figure 1 Enlarged AA section view in the image;

[0018] Figure 3 This is a right view of the lower part of the tool shank of the hole machining tool that facilitates forward and reverse chamfering of the hole opening, as described in this utility model;

[0019] Figure 4 This is a front view of the chamfering insert of the hole machining tool that facilitates chamfering in both directions, as described in this utility model. The scale of the drawing is larger than [missing information]. Figure 1 ;

[0020] Figure 5 yes Figure 4 BB section view in the middle;

[0021] Figure 6 This is a front view of the elastic sheet of the hole machining tool that facilitates forward and reverse chamfering of the hole opening, as described in this utility model. The scale of the figure is larger than [missing information]. Figure 1 ;

[0022] Figure 7 yes Figure 6 CC section view in the middle;

[0023] Figure 8This is one of the main views of the lower part of the hole machining tool that facilitates the forward and reverse chamfering of the hole opening as described in this utility model. The workpiece in the figure is a cross-sectional structure.

[0024] Figure 9 This is the second front view of the lower part of the hole machining tool that facilitates the forward and reverse chamfering of the hole opening as described in this utility model. The workpiece in the figure is a cross-sectional structure.

[0025] Figure 10 This is the third front view of the lower part of the hole machining tool that facilitates the forward and reverse chamfering of the hole opening as described in this utility model. The workpiece in the figure is a cross-sectional structure.

[0026] Figure 11 This is the fourth front view of the lower part of the hole machining tool that facilitates the forward and reverse chamfering of the hole opening as described in this utility model. The workpiece in the figure is a cross-sectional structure.

[0027] Figure 12 This is the second front view of the hole machining tool that facilitates chamfering of the hole opening in both directions, as described in this utility model;

[0028] Figure 13 yes Figure 12 Enlarged cross-sectional view of DD in the image. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings:

[0030] like Figures 1-7 As shown, the hole-making tool for facilitating forward and reverse chamfering of the hole opening according to this utility model includes a tool holder 1 and a chamfering device provided on the tool holder 1. With the axial direction of the tool holder 1 as the vertical direction, the tool holder 1 is provided with a transverse tool holder through hole 7. The chamfering device includes a chamfering blade 6, an elastic sheet 10, a pressure block 2 and a clamping screw 4. The chamfering blade 6 is placed in the tool holder through hole 7 with a non-circular radial cross section. The outer wall surface of the chamfering blade 6 is in contact with the hole wall surface of the tool holder through hole 7. The cutting edge end of the chamfering blade 6 (the right end in the figure) extends out of the tool holder through hole 7. The pressure block 2 is installed in the tool holder 1 by the clamping screw 4 and the pressure block 2 clamps the first end of the elastic sheet 10. The second end of the elastic sheet 10 is connected to the chamfering blade 6 and gives the chamfering blade 6 an elastic force that moves towards the cutting edge end.

[0031] like Figures 1-7 As shown, this utility model also discloses the following more optimized specific structures:

[0032] To more reliably limit and elastically push the chamfering insert 6, and to facilitate machining and rapid assembly, a vertical insert through hole 12 is provided on the chamfering insert 6 near the cutting edge. A countersunk hole (not marked in the figure) is provided on the outer wall of the tool shank 1 above the countersunk hole and away from the cutting edge. The pressure block 2 is installed in the countersunk hole. A connecting through hole 11 is provided between the end of the countersunk hole near the cutting edge and the tool shank through hole 7. The insert through hole 1... 2 communicates with the connecting through hole 11. A support part 9 is formed on the tool bar 1 at the position between the tool bar through hole 7, the countersunk hole of the pressure block and the connecting through hole 11. An elastic plate through hole 8 is provided on the elastic plate 10 near the first end. A section of the elastic plate 10 near the second end is bent downward and the included angle of the bending position is not less than 90°. The screw of the clamping screw 4 passes through the through hole 3 on the pressure block 2 and the elastic plate through hole 8 and is connected to the screw hole on the support part 9. The second end of the elastic plate 10 is placed in the blade through hole 12.

[0033] To facilitate the adjustment of the position of the elastic plate 10 and thus the adjustment of the extension length of the chamfering blade 6, the through hole 8 of the elastic plate is a strip-shaped through hole.

[0034] To prevent the clamping screw 4 from being exposed, the through hole 3 on the pressure block 2 is a countersunk hole and the nut of the clamping screw 4 is placed inside the countersunk hole.

[0035] To achieve both forward and reverse chamfering functions and a spiral sliding function in the middle section of the hole, the end face of the cutting edge is provided with a middle cutting edge 13, an upper cutting edge 15 on the upper side, and a lower cutting edge 14 on the lower side. The lower cutting edge 14, which gradually slopes upwards towards the end face of the cutting edge, is used to perform forward chamfering on the upper end of the hole wall when the chamfering insert 6 moves downwards with the tool holder 1. The middle cutting edge 13, which has no cutting function, is used for normal spiral sliding in the middle section of the hole when the chamfering insert 6 rotates with the tool holder 1. The upper cutting edge 15, which gradually slopes downwards towards the end face of the cutting edge, is used to perform reverse chamfering on the lower end of the hole wall when the chamfering insert 6 moves upwards with the tool holder 1.

[0036] To facilitate machining and achieve better anti-rotation function, the radial cross-section of the tool holder through hole 7 is rectangular.

[0037] To improve the smoothness of chamfering in both directions, a clearance countersunk hole 5 is provided on the outer periphery of the end wall of the tool holder through hole 7 corresponding to the cutting edge end.

[0038] According to actual needs, the chamfering device is located on the tool holder 1 near the lower end. The lower end of the tool holder 1 does not have a drill bit. Figure 1 and Figure 2 As shown; or, the lower end of the tool holder 1 is provided with a drill bit 19, as shown. Figure 12 and Figure 13 As shown, in this structure, the tool holder 1 has an axially penetrating cooling water through hole 18.

[0039] like Figures 1-11 As shown, when performing forward and reverse chamfering on the through hole 17 of workpiece 16, the upper end of the tool holder 1 is mounted on a machine tool (not shown in the figure). The machine tool drives the tool holder 1 to rotate (clockwise rotation in the figure), and simultaneously drives the tool holder 1 to move downwards, as shown. Figure 8 As shown, when the lower cutting edge 14 of the chamfering insert 6 contacts the upper end of the workpiece through hole 17, under the action of the inclined surface of the lower cutting edge 14, the chamfering insert 6 overcomes the elastic force of the elastic plate 10 and retracts into the through hole 7 of the tool holder. At the same time, the chamfering insert 6 rotates with the tool holder 1 to achieve the purpose of chamfering and deburring the upper end hole wall of the workpiece through hole 17. As the tool holder 1 moves downward, the pressure of the chamfering insert 6 on the upper end hole wall of the workpiece through hole 17 gradually increases, cutting off more metal and increasing the chamfering amplitude. This is the forward chamfering process. Figure 9 As shown; when the lower cutting edge 14 of the chamfering insert 6 is fully retracted into the countersunk hole 5, the lower cutting edge 14 no longer contacts the wall of the workpiece through hole 17, and the middle cutting edge 13 begins to contact the middle section of the workpiece through hole 17. However, the middle cutting edge 13 has no cutting function and only performs spiral sliding in the middle section of the workpiece through hole 17, as shown. Figure 10 As shown; when the lower end of the upper cutting edge 15 begins to contact the lower end wall of the workpiece through hole 17, under the elastic force of the elastic plate 10, the chamfering insert 6 will gradually move outward. At this time, the upper cutting edge 15 has a certain chamfering and deburring effect on the lower end wall of the workpiece through hole 17. However, because the elastic force of the elastic plate 10 on the chamfering insert 6 becomes smaller and smaller, the processing effect of this process is not obvious. When the upper cutting edge 15 extends completely from the lower end of the workpiece through hole 17, the tool holder 1 is moved upward by the machine tool control. Under the action of the inclined surface of the upper cutting edge 15, the chamfering insert 6 overcomes the elastic force of the elastic plate 10 and retracts into the tool holder through hole 7. At the same time, the upper cutting edge 15 performs chamfering and deburring on the upper end wall of the workpiece through hole 17. As the tool holder 1 moves upward, the pressure of the chamfering insert 6 on the lower end wall of the workpiece through hole 17 gradually increases, cutting off more metal and increasing the chamfering amplitude. This is the reverse chamfering process. Figure 11 As shown; after the upper cutting edge 15 of the chamfering insert 6 is fully retracted into the countersunk hole 5, the upper cutting edge 15 no longer contacts the hole wall of the workpiece through hole 17. The subsequent working process is the opposite of the above-mentioned related process, and will not be repeated here, until the chamfering insert 6 moves upward and disengages from the workpiece through hole 17, completing the forward and reverse chamfering and deburring process of the workpiece through hole 17.

[0040] Figure 12 and Figure 13This invention illustrates a more practical composite tool that integrates forward and reverse chamfering functions into a drilling tool. The lower drill bit 19 first drills the workpiece, and then the chamfering device performs forward and reverse chamfering and deburring on the drilled hole. The drilling and forward and reverse chamfering and deburring processes are completed in one operation, which can significantly improve production efficiency. During the drilling process, cooling water reaches the cutting part of the drill bit 19 from top to bottom through the cooling water through hole 18, cooling the part of the drill bit 19 in contact with the workpiece. This is beneficial to improve drilling efficiency, increase the service life of the drill bit 19, and better protect the workpiece from high temperature damage.

[0041] The above embodiments are merely preferred embodiments of this utility model and are not intended to limit the technical solutions of this utility model. Any technical solution that can be implemented based on the above embodiments without creative effort should be considered to fall within the scope of protection of this utility model patent.

Claims

1. A hole-making tool for facilitating forward and reverse chamfering of the hole opening, comprising a tool shank and a chamfering device disposed on the tool shank, wherein the axial direction of the tool shank is vertical, the tool shank has a transverse through hole, and the chamfering device comprises a chamfering insert, characterized in that: The chamfering device further includes an elastic sheet, a pressure block, and a clamping screw. The chamfering blade is placed inside the through hole of the tool bar, which has a non-circular radial cross-section. The outer wall surface of the chamfering blade is in contact with the hole wall surface of the through hole. The cutting edge of the chamfering blade extends out of the through hole. The pressure block is installed inside the tool bar by the clamping screw, and the pressure block clamps the first end of the two ends of the elastic sheet. The second end of the two ends of the elastic sheet is connected to the chamfering blade, giving the chamfering blade an elastic force that moves towards the cutting edge.

2. The hole machining tool for facilitating forward and reverse chamfering of the hole opening as described in claim 1, characterized in that: The chamfering blade has a vertical blade through hole near the cutting edge. The outer wall of the tool shank above the tool shank through hole and away from the cutting edge has a countersunk hole for a pressure block. The pressure block is installed in the countersunk hole for a connecting through hole between the end of the pressure block near the cutting edge and the tool shank through hole. The blade through hole communicates with the connecting through hole. A support portion is formed on the tool shank between the tool shank through hole, the countersunk hole for the pressure block, and the connecting through hole. The elastic sheet has an elastic sheet through hole near the first end. A section of the elastic sheet near the second end bends downward with an included angle of not less than 90°. The screw of the clamping screw passes through the through hole on the pressure block and the through hole on the elastic sheet and connects to the screw hole on the support portion. The second end of the elastic sheet is placed in the blade through hole.

3. The hole machining tool for facilitating forward and reverse chamfering of the hole opening as described in claim 2, characterized in that: The through hole of the elastic sheet is a strip-shaped through hole.

4. The hole machining tool for facilitating forward and reverse chamfering of the hole opening as described in claim 2, characterized in that: The through hole on the pressure block is a countersunk hole, and the nut of the clamping screw is placed inside the countersunk hole.

5. The hole machining tool for facilitating forward and reverse chamfering of the hole opening according to any one of claims 1-4, characterized in that: The end face of the cutting edge is provided with a middle cutting edge, an upper cutting edge on the upper side, and a lower cutting edge on the lower side.

6. The hole machining tool for facilitating forward and reverse chamfering of the hole opening according to any one of claims 1-4, characterized in that: The radial cross-section of the through hole in the tool holder is rectangular.

7. The hole machining tool for facilitating forward and reverse chamfering of the hole opening according to any one of claims 1-4, characterized in that: A clearance countersunk hole is provided on the outer periphery of the end wall of the through hole of the tool holder corresponding to the cutting edge.

8. The hole machining tool for facilitating forward and reverse chamfering of the hole opening according to any one of claims 1-4, characterized in that: The chamfering device is located on the tool holder near the lower end, and the lower end of the tool holder may or may not have a drill bit.

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