Deep hole bottom arc chamfer machining device

Abstract

The utility model relates to the field of chamfering cutters, and discloses a deep hole bottom arc chamfering machining device which comprises a cutter holder, round turning blades used for machining hole bottom fillets and rhombic blades used for removing allowance between hole bottom slopes and the fillets are distributed on the cutter holder in a staggered mode in the circumferential direction, and the two cutters are distributed in a staggered mode. Along with the cutting-in of the round turning blade, the diamond blade can turn off the allowance on the round corner and the hole bottom inclined surface, so that the smoothness and flatness of the machining surface can be ensured, the machining quality of the arc chamfer can be improved, and compared with a diamond blade with a large tool nose round corner, the probability of the problems of vibration, scrap winding, short service life and the like can be reduced.

Description

Technical Field

[0001] The utility model relates to the field of chamfering tools, in particular to a deep hole bottom circular arc chamfering processing device. Background Art

[0002] At present, when deep holes are processed in the industry, a more mature solution is to use an ejector drill, which generally uses a diamond blade with rounded corners. The structure can refer to the Chinese patent with authorization announcement number CN2858147Y, which discloses a circular arc cutter head installed on a deep hole ejector drill, including a drill body and a cutter head composed of an intermediate blade, a center blade and a peripheral blade connected to the drill body by screws, wherein the chamfered corner is the peripheral blade, which is a diamond blade with rounded corners, and the size of the fillet at the bottom of the hole depends on the radius of the fillet of the tip of the peripheral blade.

[0003] In actual production, the tip radius of a standard peripheral blade is usually 0.4mm, which is only suitable for processing deep holes with no or small corners. When processing large corners with a radius of 3 to 5mm, as the tip radius increases, the blade size needs to increase accordingly. The contact area between the blade and the workpiece increases, resulting in an increase in cutting thickness. The cut chips are not easy to break and are prone to chip entanglement. In addition, vibration is prone to occur during cutting, which affects the smoothness of the machined surface and reduces the service life of the blade.

[0004] If you use a round turning insert directly for machining, Figure 1 The phenomenon in the figure is that the processed surface is not a curved surface that perfectly transitions with the inclined surface at the bottom of the hole, but an arc groove with depth. Therefore, it will also lead to the problem of poor quality of arc chamfering. Utility Model Content

[0005] The utility model aims at the disadvantage that the existing ejector drill has poor processing quality when using a diamond blade with a large tip radius or a circular round turning blade to chamfer a large arc, and provides a deep hole bottom arc chamfering processing device which can improve the processing quality of deep hole large radius.

[0006] In order to solve the above technical problems, the utility model is solved by the following technical solutions:

[0007] A deep hole bottom circular arc chamfering processing device comprises a tool holder, on which circular turning blades for processing the hole bottom fillet and rhombus blades for removing the margin between the hole bottom inclined surface and the fillet are circumferentially staggeredly distributed.

[0008] With the above scheme, a single circular turning insert will machine a circular arc groove with depth, but when combined with a diamond insert, it can directly remove the excess between the inclined surface at the bottom of the hole and the circular arc, so that the circular arc groove directly becomes an arc surface that evenly transitions to the inclined surface at the bottom of the hole. After the two types of tools are staggered, as the circular turning insert cuts in, the diamond insert will also remove the excess on the fillet and the inclined surface at the bottom of the hole, which can ensure the smoothness of the machined surface and improve the machining quality. Compared with diamond inserts with larger tip radius, it can reduce the probability of problems such as vibration, chip entanglement and low service life.

[0009] Preferably, two groups of circular turning blades and diamond-shaped blades are evenly spaced and fixed on the blade holder in a detachable manner.

[0010] By adopting the above scheme, two groups of round turning blades and diamond blades can be provided to ensure good cutting quality. Both blades can be detachably fixed on the blade holder and can be replaced.

[0011] Preferably, the circular turning blade and the diamond blade are respectively detachably fixed on a blade seat, and the blade seat is detachably arranged on the blade seat through an assembly locking mechanism.

[0012] By adopting the above scheme, the blade is set on the blade seat. The blade is small in size and takes a long time to replace and calibrate. The time for replacing the blade on the blade seat can be shortened by replacing the entire blade seat. When processing the blade seat, additional time can be taken to replace the blade on the replaced blade seat. The above arrangement has the advantage of improving cutting efficiency.

[0013] Preferably, the assembly locking mechanism includes an assembly guide block protruding from the lower end of the blade seat, a guide groove recessed along the radial direction of the blade seat and allowing the assembly guide block to be embedded and slide, and a second connecting screw passing through the assembly guide block and tightly fitting with the blade seat.

[0014] Preferably, a fine-adjustment mechanism is provided between the tool holder and the blade holder, which can fine-adjust the position of the blade holder on the tool holder when the round turning blade or diamond blade is worn to ensure that the round turning blade or diamond blade can contact the workpiece hole wall.

[0015] Preferably, the fine-tuning mechanism includes a waist-shaped hole provided on the blade seat and through which the second connecting screw can pass and move relatively, and a fixing pin is threadedly connected on the blade seat and can extend into the guide groove and abut against the side wall of the assembly guide block.

[0016] By adopting the above scheme, when the blade is worn but the degree of wear is small, the extension of the round turning blade or diamond blade can be changed by adjusting the position of the second connecting screw in the waist-shaped hole to ensure that it can contact the hole wall of the part.

[0017] Preferably, the knife seat is detachably mounted on a knife rod body via a positioning and locking mechanism.

[0018] Preferably, the positioning and locking mechanism includes a first connecting screw that passes through the center of the tool holder and is tightly matched with the center of one end of the tool rod body, and an anti-deflection mechanism that prevents the tool holder from deflecting relative to the tool rod body.

[0019] With the above solution, the first connecting screw is used to lock the tool holder and the tool rod body, and the anti-deflection mechanism ensures that the two are always in a synchronous rotation state, thereby ensuring the normal progress of the cutting work.

[0020] Preferably, the anti-deflection mechanism includes a first positioning keyway and a second positioning keyway respectively arranged on one side opposite to the tool rod body and the tool seat, and a positioning key block fixed in the first positioning keyway and partially insertable into the second positioning keyway.

[0021] By adopting the above solution, the positioning key block is plugged into the first positioning key slot and the second positioning key slot at the same time to realize the synchronous rotation between the tool holder and the tool rod body.

[0022] Preferably, a cooling water circuit is provided inside the tool rod body, and a water inlet pipe connected to the water inlet of the cooling water circuit is connected to the outer wall of the tool rod body, and the center of the first connecting screw penetrates and docks with the water outlet of the cooling water circuit of the tool rod body.

[0023] By adopting the above scheme, cooling water enters the tool bar body from the water inlet pipeline and is sprayed out from the center of the first connecting screw, so that cooling water can be provided to the processing part during cutting processing.

[0024] The utility model has significant technical effects due to the adoption of the above technical scheme: the deep hole is rounded by combining a round turning blade and a diamond blade, which can directly remove the excess between the inclined surface at the bottom of the hole and the arc groove, so that the arc groove is directly transformed into an arc surface that is evenly transitioned with the inclined surface at the bottom of the hole; after the two tools are staggered, along with the cutting-in of the round turning blade, the diamond blade will subsequently turn away the fillet and the excess on the inclined surface at the bottom of the hole, which can ensure the smoothness of the processed surface and improve the processing quality; compared with the diamond blade with a larger tip radius, the probability of problems such as vibration, chip entanglement and low service life can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a cross-sectional view of the product after the existing technology uses only a round turning insert to process the arc chamfer at the bottom of the deep hole;

[0026] Figure 2 is a cross-sectional view of a product after the deep hole bottom circular arc chamfering is processed by the deep hole bottom circular arc chamfering processing device of this embodiment;

[0027] Figure 3 This is a front view of the deep hole bottom arc chamfering processing device of this embodiment after being assembled with the machine tool;

[0028] Figure 4is an axonometric view of a tool holder in the deep hole bottom circular arc chamfering processing device of this embodiment;

[0029] Figure 5 is a disassembled diagram of the blade seat and the blade of this embodiment;

[0030] Figure 6 It is a disassembled diagram of the deep hole bottom circular arc chamfering processing device of this embodiment.

[0031] The names of the parts indicated by the numerical labels in the above drawings are as follows: 1. arbor body; 101. threaded groove; 102. first positioning keyway; 2. tool holder; 201. center hole; 202. tightening threaded hole; 203. guide groove; 204. second positioning keyway; 3. water inlet pipe; 4. blade holder; 401. waist-shaped hole; 5. second connecting screw; 6. round turning blade; 7. diamond blade; 8. gasket; 9. assembly guide block; 10. tightening pin; 11. first connecting screw; 12. positioning key block; 13. positioning screw; 14. tightening screw. DETAILED DESCRIPTION

[0032] The utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] Example

[0034] A deep hole bottom arc chamfering processing device, referring to Figure 3-Figure 6 As shown, it includes a tool holder 2 and a tool rod body 1, and the tool holder 2 and the tool rod body 1 are detachably fixedly connected by a positioning locking mechanism. The positioning locking mechanism includes a first connecting screw 11 that passes through the center hole 201 of the tool holder 2 and is tightly matched with the threaded groove 101 at the center of one end of the tool rod body 1, and an anti-deflection mechanism for preventing the tool holder 2 from deflecting relative to the tool rod body 1. The anti-deflection mechanism includes a first positioning key groove 102 and a second positioning key groove 204 that are respectively arranged on the opposite side of the tool rod body 1 and the tool holder 2. The first positioning key groove 102 and the second positioning key groove 204 are each evenly spaced. A positioning key block 12 that can be partially inserted into the second positioning key groove 204 is fixed in the first positioning key groove 102 by a positioning screw 13.

[0035] A cooling water channel is provided inside the tool bar body 1, referring to Figure 6 As shown, the outer wall of the arbor body 1 is connected to a water inlet pipe 3 connected to the water inlet of the cooling water circuit. The threaded groove 101 is also the water outlet of the cooling water circuit. After the center of the first connecting screw 11 is pierced and tightly fitted with the threaded groove 101, the cooling water is finally ejected from the center of the first connecting screw 11. During cutting processing, the above structure can provide cooling water to the processing part.

[0036] Combination Figures 4 to 6As shown, the end of the tool holder 2 away from the tool rod body 1 is circumferentially staggered with round turning blades 6 for processing the bottom fillet of the hole and rhombus blades 7 for removing the margin between the bottom slope of the hole and the fillet. Two groups of round turning blades 6 and rhombus blades 7 are respectively provided, and are detachably fixed to a blade holder 4 by a set screw 14. A gasket 8 is provided between the round turning blade 6 and the blade holder 4 and between the rhombus blade 7 and the blade holder 4. The set screw 14 passes through the round turning blade 6 or the rhombus blade 7 and the gasket 8 in turn and then fits tightly with the blade holder 4.

[0037] The blade seat 4 is detachably arranged on the blade seat 2 through an assembly locking mechanism, which includes an assembly guide block 9 protruding from the lower end of the blade seat 4, a guide groove 203 on the blade seat 2 which is recessed along the radial direction of the blade seat 2 and allows the assembly guide block 9 to be embedded and moved along the radial direction of the blade seat 2, and a second connecting screw 5 that passes through the assembly guide block 9 and is tightly fitted with the blade seat 2.

[0038] A fine-tuning mechanism is provided between the tool holder 2 and the blade holder 4, which can fine-tune the position of the blade holder 4 on the tool holder 2 when the round turning blade 6 or the diamond blade 7 is worn to ensure that the round turning blade 6 or the diamond blade 7 can contact the hole wall of the workpiece. The fine-tuning mechanism includes a waist-shaped hole 401 vertically arranged on the blade holder 4 and through which the second connecting screw 5 can pass and move relatively, a threaded hole cooperating with the second connecting screw 5 is provided at the bottom of the guide groove 203, a fixing threaded hole 202 connected to the side wall of the guide groove 203 is provided on the tool holder 2, and a fixing pin 10 is used to cooperate with the fixing threaded hole 202 and extend into the guide groove 203 to abut against the side wall of the assembly guide block 9 to achieve the limiting of the blade holder 4. When the blade is worn but the degree of wear is small, the extension amount of the round turning blade 6 or the diamond blade 7 can be changed by adjusting the position of the second connecting screw 5 in the waist-shaped hole 401 to ensure that the round turning blade 6 or the diamond blade 7 can contact the hole wall of the part.

[0039] When the deep hole bottom circular arc chamfering processing device is used to perform the deep hole bottom circular arc chamfering, the round turning blade 6 is used to chamfer the corners, and the diamond blade 7 is used to cut the margin between the corners and the bottom inclined surface of the hole. Figure 1 The arc groove with depth machined by the simple round turning insert 6 is optimized Figure 2 The rounded corners displayed achieve a natural transition between large rounded corners and bevels.

[0040] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A deep hole bottom arc chamfering processing device, comprising a tool holder (2), characterized in that: The tool holder (2) is provided with circular turning blades (6) for machining the fillet of the hole bottom and rhombus blades (7) for removing the margin between the inclined surface of the hole bottom and the fillet, which are staggeredly distributed in the circumferential direction.

2. A deep hole bottom circular arc chamfering processing device according to claim 1, characterized in that: Two groups of circular turning blades (6) and diamond-shaped blades (7) are evenly spaced and fixed on the blade seat (2) in a detachable manner.

3. A deep hole bottom circular chamfering processing device according to claim 2, characterized in that: The circular turning blade (6) and the diamond blade (7) are respectively detachably fixed on a blade seat (4), and the blade seat (4) is detachably arranged on the blade seat (2) through an assembly locking mechanism.

4. A deep hole bottom circular arc chamfering processing device according to claim 3, characterized in that: The assembly locking mechanism comprises an assembly guide block (9) protruding from the lower end of the blade seat (4), a guide groove (203) recessed along the radial direction of the blade seat (2) and capable of allowing the assembly guide block (9) to be inserted and slid, and a second connecting screw (5) passing through the assembly guide block (9) and tightly fitting with the blade seat (2).

5. A deep hole bottom circular arc chamfering processing device according to claim 4, characterized in that: A fine adjustment mechanism is provided between the tool seat (2) and the blade seat (4) for finely adjusting the position of the blade seat (4) on the tool seat (2) when the round turning blade (6) or the diamond-shaped blade (7) is worn, so as to ensure that the round turning blade (6) or the diamond-shaped blade (7) can contact the hole wall of the workpiece.

6. A deep hole bottom arc chamfering processing device according to claim 5, characterized in that: The fine adjustment mechanism comprises a waist-shaped hole (401) arranged on the blade seat (4) and capable of allowing a second connecting screw (5) to pass through and move relatively therethrough, and a fixing pin (10) threadedly connected on the blade seat (2) and capable of extending into the guide groove (203) and abutting against the side wall of the assembly guide block (9).

7. The deep hole bottom arc chamfering processing device according to claim 1, characterized in that: The knife seat (2) is detachably arranged on a knife rod body (1) via a positioning locking mechanism.

8. The deep hole bottom circular arc chamfering processing device according to claim 7, characterized in that: The positioning locking mechanism comprises a first connecting screw (11) passing through the center of the knife seat (2) and tightly matched with the center of one end of the knife rod body (1), and an anti-deflection mechanism for preventing the knife seat (2) from deflecting relative to the knife rod body (1).

9. A deep hole bottom circular arc chamfering processing device according to claim 8, characterized in that: The anti-deflection mechanism comprises a first positioning key groove (102) and a second positioning key groove (204) respectively arranged on one side opposite to the knife rod body (1) and the knife seat (2), and a positioning key block (12) fixed in the first positioning key groove (102) and partially insertable into the second positioning key groove (204).

10. The deep hole bottom circular arc chamfering processing device according to claim 8, characterized in that: A cooling water circuit is arranged inside the shank body (1); an outer wall of the shank body (1) is connected to a water inlet pipe (3) connected to a water inlet of the cooling water circuit; a first connecting screw (11) penetrates through the center and butts against a water outlet of the cooling water circuit of the shank body (1).

Images