Small-diameter groove cutter

Abstract

The utility model relates to the technical field of grooving cutters, in particular to a small-diameter grooving cutter which comprises a cutter bar and a blade detachably connected to the end of the cutter bar, a cooling channel allowing cooling liquid to pass through is arranged in the cutter bar, and a cooling liquid inlet and a cooling liquid outlet are formed in the cutter bar at the two ends of the cooling channel respectively. A guide groove corresponding to and communicated with the cooling liquid outlet is formed in the blade, and an outlet of the guide groove faces the tool nose of the blade so that the cooling liquid can be guided to the tool nose. According to the small-diameter groove cutter, the cooling channel is formed in the small-diameter groove cutter, during cutting, cooling liquid can directly flow to the cutter point of the blade from the cooling channel through guiding of the guiding groove, when a small-inner-diameter workpiece is machined, a cutting part can be cooled in real time, cooling efficiency is high, the abrasion speed of the blade is reduced, and the service life of the blade is prolonged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of slotting cutter, especially relates to a small diameter slotting cutter. BACKGROUND

[0002] Small diameter slotting cutter refers to cutter diameter is smaller, usually used for processing thinner slot or hole cutter, is widely used in metal processing, die manufacturing and precision machining etc.

[0003] The blade of the existing small diameter slotting cutter is connected with the shank by welding, such as the inner hole slotting cutter disclosed in the authorized announcement CN105499619B, the cutter head is installed at one end of the shank, the blade is also connected with the shank by screw, such as the machine clamp inner hole slotting cutter with replaceable blade disclosed in the authorized announcement CN201684933U, the cutter body is a rod, the blade mounting hole is formed in the cutter body, and the blade is inserted into the blade mounting hole and is replaceably assembled through the connecting piece.

[0004] Since the diameter of the blade of the small diameter slotting cutter is small, the cutting force is relatively concentrated during cutting, and the local stress is large, so the blade is very easy to be damaged, when the blade of the small diameter slotting cutter with the blade and the shank welded is damaged, the whole cutter is scrapped, the shank cannot be reused, a large amount of material is wasted, and the use cost is high. UTILITY MODEL CONTENTS

[0005] The utility model aims at providing a small diameter slotting cutter to solve the technical problem that the small diameter slotting cutter with replaceable blade in the prior art is prone to external cooling during machining of small inner diameter workpieces, which reduces the service life of the cutter.

[0006] To solve the above problems, the utility model provides a small diameter slotting cutter which adopts the following technical scheme:

[0007] A small diameter slotting cutter comprises a shank and a blade detachably connected to the end of the shank, the shank is provided with a cooling channel for the cooling liquid to pass through, and the two ends of the cooling channel form a cooling liquid inlet and a cooling liquid outlet on the shank; a guide groove corresponding to and communicating with the cooling liquid outlet is formed in the blade, and the outlet of the guide groove faces the cutting edge of the blade to guide the cooling liquid to the cutting edge.

[0008] The beneficial effect is that the small-diameter slotting cutter is internally provided with a cooling channel, and the cooling liquid can directly flow to the cutting edge of the blade from the cooling channel and through the guide groove during cutting processing, the cutting position can be cooled in real time during processing of small inner diameter workpieces, the cooling efficiency is high, the wear rate of the blade is reduced, and the service life of the blade is prolonged.

[0009] Further, the cutter bar comprises an integrally formed clamping rod segment and a mounting rod segment, the blade is connected to the mounting rod segment, the axis of the mounting rod segment is parallel to the axis of the clamping rod segment and has a set interval, the cooling channel has a cooling straight channel segment parallel to the axis of the clamping rod segment and a cooling inclined channel segment corresponding to the guide groove, the cooling inclined channel segment is located on the mounting rod segment, and the axis of the cooling inclined channel segment coincides with the axis of the guide groove.

[0010] The beneficial effect is that the accuracy of the flow direction of the cooling liquid is ensured, and the cooling liquid can be efficiently applied to the cutting area.

[0011] Further, one end of the mounting rod segment away from the clamping rod segment is provided with a cutter bar positioning platform, one end of the blade towards the mounting rod segment is provided with a blade positioning platform matched with the cutter bar positioning platform, and the cutter bar positioning platform and the blade positioning platform correspondingly abut in the axial and radial directions of the cutter bar.

[0012] The beneficial effect is that the cutter bar positioning platform and the blade positioning platform facilitate quick positioning and installation of the blade.

[0013] Further, the blade positioning platform has a blade protrusion protruding towards the mounting rod segment, the blade protrusion has a first arc-shaped side wall coplanar with the outer side wall of the blade, and the blade protrusion has two blade positioning planes; the cutter bar positioning platform has a cutter bar protrusion protruding towards the blade, the cutter bar protrusion has a second arc-shaped side wall coplanar with the outer side wall of the mounting rod segment, and the cutter bar protrusion also has two cutter bar positioning planes corresponding to the blade positioning planes and abutting in the radial direction of the clamping rod segment; and the first arc-shaped side wall and the second arc-shaped side wall are coplanar.

[0014] The beneficial effect is that the blade protrusion and the cutter bar protrusion are in the form of insertion and assembly, the structure is simpler, and the appearance is more beautiful after the blade and the cutter bar are assembled.

[0015] Further, the clamping rod segment is a constant-diameter rod segment, the radial cross section of the mounting rod segment below the cutter bar protrusion comprises two symmetrically arranged first outer arcs and two first transition arcs respectively connecting the corresponding ends of the first outer arcs, the intersection between the line connecting the centers of the two first outer arcs and the line connecting the centers of the two first transition arcs has a set interval with the axis of the clamping rod segment, and one of the first outer arcs is coplanar with the outer side wall of the blade when the blade is mounted on the cutter bar.

[0016] Beneficial effect: the shape of the radial section is not a whole circle, and the area of the radial section is larger than that of the ordinary whole circle under the condition that the sizes of the clamping rod segments are the same, so that the strength of the tool bar is higher.

[0017] Further, the horizontal section of the part of the blade above the blade protrusion comprises a second outer circular arc, a second transition circular arc, a third outer circular arc, a straight line segment and a third transition circular arc connected in sequence, the center of the second transition circular arc is located inside the horizontal section, and the center of the third transition circular arc is located outside the horizontal section; the second outer circular arc is coplanar with the first outer circular arc when the blade is installed on the tool bar; and the intersection of the second outer circular arc and the straight line segment is located on the blade tip of the blade.

[0018] Beneficial effect: a chip groove is formed at the third transition circular arc on the blade, the chip removal capacity of the blade is improved, the influence of the chips on the blade tip is reduced, and the accuracy of the inner hole groove is ensured.

[0019] Further, the second transition circular arc, the third outer circular arc and the third transition circular arc of the horizontal section are gradually offset to the radial outside of the clamping rod segment from top to bottom in the axial direction of the clamping rod segment.

[0020] Beneficial effect: beneficial to increase the strength of the blade.

[0021] Further, a screw counterbore for the screw to pass through is arranged on the blade, and a threaded blind hole matched with the screw is arranged on the mounting rod segment.

[0022] Beneficial effect: the assembly and disassembly of the blade and the tool bar are facilitated, and the screw is not exposed after installation, and the whole is beautiful.

[0023] Further, the rake angle of the blade ranges from 0 to 20 degrees, the relief angle ranges from 0 to 30 degrees, the inclination angle ranges from 0 to 10 degrees, the main offset angle ranges from 0 to 10 degrees, and the negative offset angle ranges from 0 to 10 degrees.

[0024] Beneficial effect: beneficial to keep the blade in good chip performance. BRIEF DESCRIPTION OF DRAWINGS

[0025] The above and other objects, features and advantages of the exemplary embodiments of the present application will be more apparent from the following detailed description read in conjunction with the accompanying drawings, in which several embodiments of the present application are shown by way of example, and wherein the same reference numerals refer to the same or similar components throughout several views. In the drawings:

[0026] Figure 1 It is a schematic view of the three-dimensional structure of the small-diameter slotting tool of the present application;

[0027] Figure 2This is a schematic diagram of the three-dimensional structure of the tool holder;

[0028] Figure 3 To display Figure 1 A schematic diagram of the internal structure;

[0029] Figure 4 This is a schematic diagram of the radial section of the mounting rod segment;

[0030] Figure 5 This is a schematic diagram of the blade from a first-person perspective.

[0031] Figure 6 This is a schematic diagram of the blade from a second perspective.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Blade; 11. Blade protrusion; 111. Blade positioning plane; 112. Blade contact plane; 113. First arc-shaped sidewall; 12. Screw countersunk hole; 13. Second outer arc; 14. Third outer arc; 15. Second transition arc; 16. Third transition arc; 17. Straight section; 18. Blade tip; 19. Guide groove; 20. Blade pressing plane; 2. Tool holder; 21. Mounting rod section; 211. First outer arc; 212. First transition arc; 22. Clamping rod section; 23. Cooling straight channel section; 24. Cooling oblique channel section; 25. Tool holder protrusion; 251. Second arc-shaped sidewall; 252. Tool holder positioning plane; 253. Tool holder contact plane; 254. Tool holder pressing plane; 26. Threaded blind hole; 27. Coolant inlet; 28. Coolant outlet. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Those skilled in the art should understand that the embodiments described below are only some, not all, of the embodiments disclosed. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0035] The principles and spirit of this utility model will be explained in detail below with reference to several representative embodiments.

[0036] Embodiment 1 of the small-diameter grooving tool provided by this utility model:

[0037] like Figure 1 As shown, the small-diameter grooving cutter includes a cutter bar 2 and a blade 1 detachably connected to the end of the cutter bar 2.

[0038] Among them, such as Figure 1As shown, the tool bar 2 is provided with a cooling channel for the cooling liquid to pass through, and the two ends of the cooling channel form a cooling liquid inlet 27 and a cooling liquid outlet 28 on the tool bar 2 respectively. Specifically, in the embodiment, as shown in Figure 2 As shown, the tool bar 2 includes an integral clamping rod segment 22 and a mounting rod segment 21, the clamping rod segment 22 is used to be connected with the machining equipment, and the mounting rod segment 21 is connected with the blade 1. The clamping rod segment 22 is a constant-diameter round rod segment, and the outer diameters of each radial section are equal. The mounting rod segment 21 is an eccentric rod segment, and the axis thereof is parallel to the axis of the clamping rod segment 22 and has a set interval. The blade 1 is provided with a screw counterbore 12 for the screw to pass through, and the mounting rod segment 21 is provided with a threaded blind hole 26 matched with the screw.

[0039] As shown in Figure 3 As shown, the cooling channel includes a cooling straight channel segment 23 arranged in the clamping rod segment 22 and the mounting rod segment 21, and a cooling inclined channel segment 24 arranged in the mounting rod segment 21, the cooling inclined channel segment 24 and the cooling straight channel segment 23 are communicated, and the axis of the cooling straight channel segment 23 coincides with the axis of the clamping rod segment 22.

[0040] The end of the mounting rod segment 21 away from the clamping rod segment 22 is provided with a tool bar positioning platform, and the end of the blade 1 facing the mounting rod segment 21 is provided with a blade positioning platform matched with the tool bar positioning platform. As shown in Figure 1 and Figure 6 As shown, the blade positioning platform has a blade protrusion 11 protruding towards the mounting rod segment 21, the blade protrusion 11 has a first arc-shaped side wall 113 coplanar with the outer side wall of the blade 1, two blade positioning planes 111 and a blade abutting plane 112; the blade positioning platform further includes a blade pressing plane 20. As shown in Figure 1 and Figure 2 As shown, the tool bar positioning platform has a tool bar protrusion 25 protruding towards the blade 1, the tool bar protrusion 25 has a second arc-shaped side wall 251 coplanar with the outer side wall of the mounting rod segment 21, two tool bar positioning planes 252 and a tool bar abutting plane 253, and the tool bar positioning platform further includes a tool bar pressing plane 254 located at the end of the mounting rod segment 21. The shape and size of the blade abutting plane 112 are the same as those of the tool bar pressing plane 254, and the shape and size of the blade pressing plane 20 are the same as those of the tool bar abutting plane 253.

[0041] When the blade 1 is installed, the two blade positioning planes 111 are in contact with the two blade holder positioning planes 252, the blade contact plane 112 is in contact with the blade holder pressing plane 254, and the blade pressing plane 20 is in contact with the blade holder contact plane 253. At this time, the blade protrusion 11 and the blade holder protrusion 25 are blocked in the radial direction of the clamping rod section 22 and are also blocked in the axial direction, and the first arc-shaped side wall 113 is coplanar with the second arc-shaped side wall 251. The blade 1 and the blade holder 2 can be fastened and assembled by assembling the screw through the screw hole 12 and the threaded blind hole 26.

[0042] In this embodiment, as shown in Figure 4 , the radial section of the portion of the installation rod section 21 below the blade holder protrusion 25 includes two symmetrically arranged first outer circular arcs 211 and two first transition circular arcs 212 respectively connecting the corresponding ends of the first outer circular arcs 211. One of the first outer circular arcs 211 is coplanar with the outer side wall of the blade when the blade is installed on the blade holder. The shape of the radial section is not a complete circle, and under the condition that the size of the clamping rod section 22 is the same, the area of the radial section is larger than that of a common complete circle, so that the strength of the blade holder 2 is higher.

[0043] As shown in Figure 5 , the horizontal section of the portion of the blade 1 above the blade protrusion 11 includes a second outer circular arc 13, a second transition circular arc 15, a third outer circular arc 14, a straight line segment 17, and a third transition circular arc 16 connected in sequence. The center of the second transition circular arc 15 is located inside the horizontal section, and the center of the third transition circular arc 16 is located outside the horizontal section. The second outer circular arc 13 is coplanar with one of the first outer circular arcs 211 when the blade is installed on the blade holder; the intersection of the second outer circular arc 13 and the straight line segment 17 is located on the blade tip 18 of the blade. The second transition circular arc 15, the third outer circular arc 14, and the third transition circular arc 16 on the horizontal section gradually deviate to the radial outside of the clamping rod section 22 from top to bottom in the axial direction of the clamping rod section 22. Within the range allowed by space, the deviation distance is as large as possible to increase the strength of the blade.

[0044] As shown in Figure 1 and Figure 6 , the blade also has a guide groove 19 corresponding to the cooling inclined channel section 24, and the axis of the cooling inclined channel section 24 coincides with the axis of the guide groove 19 to guide the cooling liquid to the blade tip 18 of the blade.

[0045] In the embodiment, the cutting edge part of the blade can be made of appropriate alloy or PCD material according to the material of the workpiece. The rake angle of the blade ranges from 0 to 20 degrees, the relief angle ranges from 0 to 30 degrees, the inclination angle ranges from 0 to 10 degrees, the primary clearance angle ranges from 0 to 10 degrees, and the negative clearance angle ranges from 0 to 10 degrees. The degrees of the angles are processed according to the requirements of the actual workpiece, and the reasonable rake angle, relief angle, inclination angle, primary clearance angle and negative clearance angle beneficial to cutting are selected within the above ranges.

[0046] The small-diameter slotting cutter provided by the utility model meets the premise that the blade can be replaced, realizes quick positioning and installation of the blade, is provided with a cooling flow channel, can efficiently cool the cutting area, improves the service life of the blade, improves the machining efficiency, reduces the use cost, and improves the surface quality of the workpiece.

[0047] Embodiment 2 of the small-diameter slotting cutter provided by the utility model is as follows:

[0048] The difference between the embodiment and the embodiment 1 mainly lies in that:

[0049] In the embodiment 1, the axis of the cooling inclined channel section coincides with the axis of the guide groove.

[0050] In the embodiment, the axis of the cooling inclined channel section is parallel to and spaced from the axis of the guide groove, at this time, the cooling liquid still flows to the guide groove through the cooling inclined channel section, and finally flows to the tool tip.

[0051] Embodiment 3 of the small-diameter slotting cutter provided by the utility model is as follows:

[0052] The difference between the embodiment and the embodiment 1 mainly lies in that:

[0053] In the embodiment 1, the radial section of the mounting rod section of the small-diameter slotting cutter comprises two symmetrically arranged first outer arcs and two first transition arcs respectively connected to the corresponding ends of the first outer arcs, and the radial section is not a whole circle.

[0054] In the embodiment, when the strength of the tool bar is sufficient for use, the radial section of the mounting rod section of the small-diameter slotting cutter is a whole circle, and in actual use, the position of the mounting rod section can be reasonably set according to the specific shape of the workpiece, for example, the mounting rod section is still arranged in parallel and spaced from the axis of the clamping rod section, and of course, the mounting rod section can be arranged coaxially with the clamping rod section.

[0055] Embodiment 4 of the small-diameter slotting cutter provided by the utility model is as follows:

[0056] The difference between the embodiment and the embodiment 1 mainly lies in that:

[0057] In the embodiment 1, the blade positioning and installation mode of the small-diameter slotting cutter is realized by blocking and fitting of the blade protrusion and the tool bar protrusion in the radial direction and the axial direction.

[0058] In the embodiment, the blade of the small-diameter slotting tool is positioned in the form of insertion, that is, an insertion protrusion is arranged on one of the blade and the mounting rod segment, and an insertion slot is arranged on the other one, and the insertion protrusion is inserted into the insertion slot and then fastened and connected through a screw.

[0059] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A small diameter slotting tool comprising a tool shank and a tool insert removably attached to the end of the tool shank, characterised in that, The tool bar is provided with a cooling channel for cooling liquid, and the two ends of the cooling channel form a cooling liquid inlet and a cooling liquid outlet on the tool bar respectively; the tool blade is provided with a guide groove corresponding to and communicating with the cooling liquid outlet, and the outlet of the guide groove is directed to the tool tip of the tool blade to guide the cooling liquid to the tool tip.

2. The small diameter slotting cutter according to claim 1, wherein The tool bar comprises an integrally formed clamping rod segment and a mounting rod segment, the tool blade is connected to the mounting rod segment, the axis of the mounting rod segment is parallel to the axis of the clamping rod segment and has a set interval, the cooling channel has a cooling straight channel segment parallel to the axis of the clamping rod segment and a cooling inclined channel segment corresponding to the guide groove, the cooling inclined channel segment is located on the mounting rod segment, and the axis of the cooling inclined channel segment coincides with the axis of the guide groove.

3. The small diameter slotting cutter according to claim 2, wherein One end of the mounting rod segment away from the clamping rod segment is provided with a tool bar positioning platform, and one end of the tool blade directed to the mounting rod segment is provided with a tool blade positioning platform matched with the tool bar positioning platform, and the tool bar positioning platform and the tool blade positioning platform correspondingly abut in the axial and radial directions of the tool bar.

4. The small diameter slotting cutter according to claim 3, wherein The tool blade positioning platform has a tool blade protrusion protruding towards the mounting rod segment, the tool blade protrusion has a first arc-shaped side wall coplanar with the outer side wall of the tool blade, and the tool blade protrusion has two tool blade positioning planes, the tool bar positioning platform has a tool bar protrusion protruding towards the tool blade, the tool bar protrusion has a second arc-shaped side wall coplanar with the outer side wall of the mounting rod segment, and the tool bar protrusion also has two tool bar positioning planes respectively abutting with the tool blade positioning planes in the radial direction of the clamping rod segment, and the first arc-shaped side wall and the second arc-shaped side wall are coplanar.

5. The small diameter slotting cutter according to claim 4 wherein, The clamping rod segment is a constant-diameter rod segment, the radial section of the mounting rod segment below the tool bar protrusion comprises two symmetrically arranged first outer circular arcs and two first transition circular arcs respectively connecting the corresponding ends of the first outer circular arcs, the intersection between the line connecting the centers of the two first outer circular arcs and the line connecting the centers of the two first transition circular arcs has a set interval with the axis of the clamping rod segment, and one of the first outer circular arcs is coplanar with the outer side wall of the tool blade when the tool blade is mounted on the tool bar.

6. The small diameter slotting cutter according to claim 4 wherein, The horizontal section of the part of the tool blade above the tool blade protrusion comprises a second outer circular arc, a second transition circular arc, a third outer circular arc, a straight line segment and a third transition circular arc connected in sequence, the center of the second transition circular arc is located inside the horizontal section, and the center of the third transition circular arc is located outside the horizontal section, the second outer circular arc is coplanar with the one of the first outer circular arcs when the tool blade is mounted on the tool bar, and the intersection between the second outer circular arc and the straight line segment is located on the tool tip of the tool blade.

7. The small diameter slotting cutter according to claim 6 wherein, The second transition circular arc, the third outer circular arc and the third transition circular arc of the horizontal section are gradually offset to the radial outside of the clamping rod segment from top to bottom in the axial direction of the clamping rod segment.

8. A small diameter slotting tool according to any one of claims 2 to 7, characterised in that, The tool blade is provided with a screw counterbore for a screw to pass through, and the mounting rod segment is provided with a threaded blind hole matched with the screw.

9. The small diameter slotting cutter according to any one of claims 1 to 3, wherein The rake angle of the tool blade ranges from 0° to 20°, the relief angle ranges from 0° to 30°, the inclination angle ranges from 0° to 10°, the primary clearance angle ranges from 0° to 10°, the negative clearance angle ranges from 0° to 10°.

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