Deep hole drill
By designing a spiral chip discharge groove on the blade section of the deep hole drill and changing the shape and depth of the chip discharge groove in the front and rear cutting sections, the problems of chip jamming and tool breakage in the existing deep hole drill are solved, and the chip discharge is achieved smoothly.
Patent Information
- Application Number
- CN202422150534.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-02
- Publication Date
- 2025-06-13
- Estimated Expiration
- 2034-09-02
AI Technical Summary
The chip drain shape of the existing deep hole drill remains unchanged, and increasing the groove depth can easily lead to chip jams, clogs and tool breakage in the chip drain.
A deep hole drill is designed, and two chip drain grooves extending spirally from front to back are arranged on the outer periphery of the blade section. The bottom edge of the chip drain groove groove of the front blade section is S-shaped, the bottom edge of the chip drain groove groove of the rear blade section is C-shaped, and the bottom edge shape of the chip drain groove groove of the transition blade section is transitioned from S-shaped to C-shaped, and the depth of the chip drain groove of the front blade section is smaller than the depth of the chip drain groove of the rear blade section.
By changing the bottom edge shape of the chip removal groove of the back blade section, the chip removal space is increased, so that the chips formed by the front blade section are not easily blocked in the back blade section, and the chips can be discharged smoothly and the tool can be avoided breakage.
Smart Images
Figure CN222971052U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of drill bits, and particularly relates to a deep hole drill. Background Art
[0002] A deep hole drill is a drill bit specifically used for processing deep holes. Since the processed holes are relatively deep, during deep hole drilling, chips are not easily discharged. If the chip removal is not smooth, the tool is likely to break.
[0003] Currently, the shape of the chip removal groove of a general deep hole drill on the market remains basically the same from the front section to the rear section. By increasing the slot depth (see Figure 1 ), the chip holding space is increased to facilitate the discharge of chips from the front to the rear.
[0004] However, since the shape of the chip removal groove is the same before and after in this method, the shape of the iron chips generated at the drill tip is the same as that of the chip removal groove at the rear end. During the chip discharge process, chips are easily stuck, which can easily lead to chip blockage and tool breakage; moreover, the increase in the chip holding space in this method is limited. When there is a need for high-speed machining or the internal coolant pressure in the machine tool is insufficient, chips often get stuck in the groove, causing blockage and ultimately tool breakage. Summary of the Utility Model
[0005] The purpose of the utility model is to provide a deep hole drill to solve the technical problem that the existing method of chip removal by keeping the shape of the chip removal groove unchanged and increasing the slot depth is prone to chip jamming and tool breakage.
[0006] To solve the above technical problem, the utility model provides a deep hole drill, including: a cutting edge section and a tool shank section; two chip removal grooves spirally extending from the front to the rear are arranged on the outer periphery of the cutting edge section; wherein
[0007] The cutting edge section includes a front cutting section, a transition cutting section and a rear cutting section from the front to the rear;
[0008] The bottom edge of the chip removal groove of the front cutting section is S-shaped, the bottom edge of the chip removal groove of the rear cutting section is C-shaped, and the shape of the bottom edge of the chip removal groove of the transition cutting section transitions from S-shaped to C-shaped from the front to the rear; and
[0009] The depth of the chip removal groove of the front cutting section is less than the depth of the chip removal groove of the rear cutting section.
[0010] In an embodiment of the present application, the bottom edge of the chip removal groove of the front cutting section includes a first arc edge and a second arc edge, and the first arc edge protrudes towards the tool core, and the second arc edge protrudes in the direction away from the tool core, and the radius R1 of the first arc edge is greater than the radius R2 of the second arc edge;
[0011] The bottom edge of the chip evacuation groove of the rear cutting edge segment is a third arc, and the third arc edge protrudes towards the tool core, and the radius of the third arc edge is greater than the radius R1 of the first arc edge.
[0012] In an embodiment of the present application, the width of the opening of the chip evacuation groove of the front cutting edge segment is less than 1 / 4 of the circumference of the cutting edge segment;
[0013] The width of the opening of the chip evacuation groove of the rear cutting edge segment is greater than 1 / 4 of the circumference of the cutting edge segment.
[0014] In an embodiment of the present application, the diameter of the cutting edge segment is d;
[0015] The axial length of the front cutting edge segment is 5 - 7d;
[0016] The axial length of the transition cutting edge segment is 2 - 4d;
[0017] The axial length of the rear cutting edge segment is 5 - 20d.
[0018] In an embodiment of the present application, the diameter of the cutting edge segment 1 is d;
[0019] The radius R1 of the first arc edge is 0.25 - 0.35d;
[0020] The radius R2 of the second arc edge is 0.1 - 0.2d;
[0021] The radius R3 of the third arc edge is 0.45 - 0.6d.
[0022] In an embodiment of the present application, the diameter of the cutting edge segment is d;
[0023] The tool core diameter D1 of the front cutting edge segment is 0.3 - 0.35d;
[0024] The tool core diameter D2 of the rear cutting edge segment is 0.24 - 0.28d.
[0025] In an embodiment of the present application, the grooving rate of the front cutting edge segment is 40% - 45%;
[0026] The grooving rate of the rear cutting edge segment is 45% - 50%.
[0027] The beneficial effects of the present utility model are as follows. The deep hole drill of the present utility model includes a cutting edge section and a tool shank section. Two chip flutes extending spirally from front to back are provided on the outer periphery of the cutting edge section. The cutting edge section includes a front cutting section, a transition cutting section, and a rear cutting section from front to back. The bottom edge of the chip flute in the front cutting section is S-shaped, the bottom edge of the chip flute in the rear cutting section is C-shaped, and the shape of the bottom edge of the chip flute in the transition cutting section transitions from S-shaped to C-shaped from front to back. And the depth of the chip flute in the front cutting section is less than the depth of the chip flute in the rear cutting section. By changing the shape of the bottom edge of the chip flute in the rear cutting section, the deep hole drill of the present utility model increases the chip-holding space of the chip flute in the rear cutting section and makes the chips formed in the front cutting section not easily blocked in the rear cutting section, and the chips can be discharged smoothly.
[0028] Other features and advantages of the present utility model will be described in the following specification, and, in part, will be obvious from the specification, or will be understood by implementing the present utility model. The objectives and other advantages of the present utility model are achieved and obtained by the structures specifically pointed out in the specification and the drawings.
[0029] To make the above objectives, features, and advantages of the present utility model more obvious and understandable, the following specifically enumerates preferred embodiments and, in conjunction with the accompanying drawings, is described in detail as follows. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] To more clearly illustrate the specific embodiments of the present utility model or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0031] Figure 1 is a schematic diagram of the shape comparison of the chip flutes in the front cutting section and the rear cutting section of the deep hole drill;
[0032] Figure 2 is a front view of a preferred embodiment of the deep hole drill of the present utility model;
[0033] Figure 3 is a schematic diagram of the shape comparison of the chip flutes in the front cutting section and the rear cutting section of the deep hole drill of the present utility model.
[0034] In the figure:
[0035] Cutting edge section 1, tool shank section 2, chip flute 3, tool core 4, first arc edge 111, second arc edge 112, third arc 113. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0036] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0037] See Figure 2 and Figure 3 In an embodiment of the present application, a deep hole drill includes a cutting edge section 1 and a tool shank section 2; two chip flutes 3 spirally extending from front to back are provided on the outer periphery of the cutting edge section 1; wherein the cutting edge section 1 includes a front cutting section, a transition cutting section, and a rear cutting section from front to back; the bottom edge of the chip flute 3 of the front cutting section is S-shaped, the bottom edge of the chip flute 3 of the rear cutting section is C-shaped, and the shape of the bottom edge of the chip flute 3 of the transition cutting section transitions from S-shaped to C-shaped from front to back; and the depth of the chip flute 3 of the front cutting section is less than the depth of the chip flute 3 of the rear cutting section.
[0038] In this embodiment, by designing the shape of the bottom edge of the chip flute 3 of the rear cutting section to be C-shaped, which is different from the S-shaped bottom edge of the chip flute 3 of the front cutting section, the chips generated in the front cutting section are not easily blocked in the rear cutting section; and, the depth of the chip flute 3 of the rear cutting section is greater than the depth of the chip flute 3 of the front cutting section, increasing the chip evacuation space and facilitating the evacuation of chips.
[0039] Specifically, the bottom edge of the chip flute 3 of the front cutting section includes a first arc edge 111 and a second arc edge 112, and the first arc edge 111 protrudes towards the tool core 4, and the second arc edge 112 protrudes in a direction away from the tool core 4. The radius R1 of the first arc edge 111 is greater than the radius R2 of the second arc edge 112; the bottom edge of the chip flute 3 of the rear cutting section is a third arc 113, and the third arc 113 edge protrudes towards the tool core 4, and the radius R3 of the third arc 113 edge is greater than the radius R1 of the first arc edge 111.
[0040] In this embodiment, the bottom edge of the chip flute 3 of the front cutting section consists of two arcs with opposite bending directions, one large and one small; the bottom edge of the chip flute 3 of the rear cutting section consists of a single arc; in other words, the bottom edge of the chip flute 3 of the rear cutting section can be regarded as formed by the continuous elongation of the first arc edge 111 and the continuous shortening of the second arc edge 112 until it disappears.
[0041] See Figure 3 , the width of the mouth of the chip flute 3 of the front cutting section is less than 1 / 4 of the circumference of the cutting edge section 1; the width of the mouth of the chip flute 3 of the rear cutting section is greater than 1 / 4 of the circumference of the cutting edge section 1; this can make the mouth of the chip flute 3 of the rear cutting section larger and more conducive to chip evacuation.
[0042] In this embodiment, preferably, the diameter of the blade segment 1 is d; the axial length of the front blade segment is 5 to 7d; the axial length of the transition blade segment is 2 to 4d; and the axial length of the rear blade segment is 5 to 20d.
[0043] In this embodiment, preferably, the slotting rate of the front blade segment is 40% to 45%; the slotting rate of the rear blade segment is 45% to 50%. It can be understood that the slotting rate is the percentage of the total area of the chip groove 3 of the cross section to the outer circumference of the drill bit.
[0044] In this embodiment, preferably, the diameter of the blade segment 1 is d; the radius R1 of the first arc edge 111 is 0.25-0.35d; the radius R2 of the second arc edge 112 is 0.1-0.2d; and the radius R3 of the third arc edge 113 is 0.45-0.6d.
[0045] In this embodiment, preferably, the diameter of the blade segment 1 is d; the diameter D1 of the blade core 4 of the front blade segment is 0.3-0.35d; and the diameter D2 of the blade core 4 of the rear blade segment is 0.24-0.28d.
[0046] In one application scenario, a sharp rake angle (e.g., 18° to 22°) is used at the front end of the drill bit.
[0047] °), the main purpose is to break the chips; the length of the front segment can be 7d, and the shape of the chip groove 3 is as follows Figure 3 The left picture has a smaller chip breaking radius R1 (taking a drill with a diameter of 10 mm as an example, R1≈2.8 mm); the length of the transition segment can be 2 to 4 d; the main function of the rear segment is to discharge iron chips. By changing the groove depth and the deflection grinding wheel angle, the chip capacity of the chip groove is increased, such as R3 (taking a drill with a diameter of 10 mm as an example, R1≈5 mm), which changes the cross-sectional area of the chip groove.
[0048] In this embodiment, the deep hole drill of the utility model can allow the tool to discharge the chips smoothly even when the cooling pressure in the machine tool is relatively low; by changing the shape of the chip groove, the deep hole drill can process materials with fine chips (such as gray cast iron, etc.) under low cooling pressure, and the chips can be discharged smoothly without being blocked in the chip groove. For example, the iron chips generated from the front end of the deep hole drill will be curled by the chip groove, and its shape will be close to R1. The shape of the front and rear chip grooves is consistent, which can easily cause the chips to get stuck in a certain section during the discharge process, resulting in poor chip discharge and tool breakage; the utility model can avoid this problem well by changing the cross-section of the groove.
[0049] In the description of the embodiments of the present utility model, unless otherwise clearly defined and limited, the terms "installed", "connected", and "coupled" shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection.
[0050] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present utility model. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.
[0051] Taking the above ideal embodiments of the present utility model as an inspiration, through the above description, relevant staff can completely make various changes and modifications without departing from the technical idea of this utility model. The technical scope of this utility model is not limited to the content in the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A deep hole drill, characterized in that: include: A blade section (1) and a handle section (2); the outer periphery of the blade section (1) is provided with two chip removal grooves (3) extending in a spiral shape from front to back; wherein The blade segment (1) comprises, from front to back, a front blade segment, a transition blade segment and a rear blade segment; The bottom edge of the chip groove (3) of the front blade segment is S-shaped, the bottom edge of the chip groove (3) of the rear blade segment is C-shaped, and the bottom edge of the chip groove (3) of the transition blade segment transitions from S-shaped to C-shaped from front to back; and The depth of the chip removal groove (3) of the front blade segment is smaller than the depth of the chip removal groove (3) of the rear blade segment.
2. The deep hole drill according to claim 1, characterized in that: The bottom edge of the chip removal groove (3) of the front blade segment comprises a first arc edge (111) and a second arc edge (112), and the first arc edge (111) protrudes toward the blade core (4), and the second arc edge (112) protrudes in a direction away from the blade core (4), and the radius R1 of the first arc edge (111) is greater than the radius R2 of the second arc edge (112); The bottom edge of the chip removal groove (3) of the rear blade segment is a third circular arc (113), the third circular arc (113) edge protrudes toward the blade core (4), and the radius R3 of the third circular arc (113) edge is greater than the radius R1 of the first circular arc edge (111).
3. The deep hole drill according to claim 2, characterized in that: The width of the chip removal groove (3) of the front blade segment is less than 1 / 4 of the circumference of the blade segment; The width of the notch of the chip removal groove (3) of the rear blade segment is greater than 1 / 4 of the circumference of the blade segment.
4. The deep hole drill according to claim 2, characterized in that: The diameter of the blade section (1) is d; The axial length of the front blade segment is 5 to 7d; The axial length of the transition blade segment is 2 to 4d; The axial length of the rear blade segment is 5 to 20 d.
5. The deep hole drill according to claim 2, characterized in that: The diameter of the blade section (1) is d; The radius R1 of the first circular arc side (111) is 0.25 to 0.35 d; the radius R2 of the second circular arc side (112) is 0.1 to 0.2 d; and the radius R3 of the third circular arc side (113) is 0.45 to 0.6 d.
6. The deep hole drill according to claim 1, characterized in that: The diameter of the blade section (1) is d; The diameter D1 of the blade core (4) of the front blade segment is 0.3-0.35d; The diameter D2 of the blade core (4) of the rear blade segment is 0.24-0.28d.
7. The deep hole drill according to claim 1, characterized in that: The slotting rate of the front blade segment is 40% to 45%; The slotting rate of the rear blade segment is 45% to 50%.