Rough and fine integrated step drill

Abstract

The utility model discloses a rough and fine integrated step drill, which relates to the technical field of cutters, and comprises a cutter handle and a cutting part, and the cutting part comprises a first cutting section and a second cutting section; a first chip groove and a second chip groove are formed in the second cutting section; coarse blade mounting grooves are formed in the first main cutter side wall of the second cutting section and the second main cutter side wall of the second cutting section, coarse blades are mounted in the coarse blade mounting grooves, fine blade mounting grooves are formed in the first main cutter side wall of the first cutting section, fine blades are mounted in the fine blade mounting grooves, and the fine blades are mounted in the fine blade mounting grooves in the axial direction of the cutting part. The distance between the tool nose of the finish tool grain and the axis of the cutting part is larger than the distance between the tool nose of the rough tool grain and the axis of the cutting part, and the rough tool grain used for rough machining and the finish tool grain used for finish machining are arranged at different positions of the step-shaped cutting part. Rough machining and finish machining after rough machining can be carried out under the condition that tools do not need to be replaced.

Description

TECHNICAL FIELD

[0001] The utility model relates to tool technical field especially relates to a rough and fine integrated step drill. BACKGROUND

[0002] In the process of punching the water cooling piece, the CNC machine tool usually drives the tool (such as boring tool) to process the hole, including finishing and rough machining. If rough machining is carried out by using the tool with rough machining grains, and finishing is carried out by using the tool with finishing grains. But the tool currently used is mainly single rough machining tool and single finishing tool. If the user wants to carry out rough machining and finishing, the user needs to use the rough machining tool to carry out rough machining on the hole first, then replace the finishing tool, and then carry out finishing on the hole. The processing efficiency is slow, and it needs to be improved. UTILITY MODEL CONTENT

[0003] The utility model aims at providing a technical scheme capable of solving the above problems.

[0004] To achieve the above object, the utility model provides the following technical scheme: a rough and fine integrated step drill, which comprises a tool shank and a cutting part connected to one end of the tool shank, the cutting part comprises a first cutting section connected to the tool shank and a second cutting section connected to one end of the first cutting section away from the tool shank, the first cutting section extends outward so that the diameter of the first cutting section is greater than the diameter of the second cutting section, the first cutting section and the second cutting section combine to form a step-shaped cutting part, the outer side surface of the second cutting section is formed with a first chip removal groove and a second chip removal groove, the first chip removal groove and the second chip removal groove both extend from the end surface of the second cutting section away from the tool shank to the length direction of the cutting part, the first chip removal groove has a first main tool side wall and a first chip removal side wall corresponding to the first main tool side wall, and the second chip removal groove has a second main tool side wall and a second chip removal side wall corresponding to the second main tool side wall, the first main tool side wall of the second cutting section and the second main tool side wall of the second cutting section are both formed with a rough grain mounting groove, the rough grain mounting groove has a first tool tip exposed opening that is connected to the outer side surface of the second cutting section, a rough grain is mounted on the rough grain mounting groove, and the tool tip of the rough grain protrudes from the outer side surface of the second cutting section through the corresponding first tool tip exposed opening, the first main tool side wall of the first cutting section is formed with a finishing grain mounting groove, the finishing grain mounting groove has a second tool tip exposed opening that is connected to the outer side surface of the first cutting section, a finishing grain is mounted on the finishing grain mounting groove, the tool tip of the finishing grain protrudes from the outer side surface of the first cutting section through the second tool tip exposed opening, and in the axial direction of the cutting part, the distance between the tool tip of the finishing grain and the axis of the cutting part is greater than the distance between the tool tip of the rough grain and the axis of the cutting part.

[0005] As a further scheme of the utility model, the first chip removal side wall of the first cutting section is formed with an additional chip removal avoidance groove corresponding to the finishing grain.

[0006] As a further aspect of the present application, the additional chip removal avoidance groove has a first extension groove portion beyond the fine cutter grain in a direction away from the shank and a second extension groove portion beyond the fine cutter grain in a direction close to the shank in the axial direction of the cutting portion.

[0007] As a further aspect of the present application, the first extension groove portion and the second extension groove portion are both concave arc-shaped groove portions continuous with the additional chip removal avoidance groove.

[0008] As a further aspect of the present application, the coarse cutter grains on the first main cutter side wall and the coarse cutter grains on the second main cutter side wall are symmetrically arranged at a rotation angle of 180° with the axis of the second cutting section as the center line.

[0009] As a further aspect of the present application, the inner wall of the first chip removal groove and the second chip removal groove close to the shank is a concave arc-shaped inner wall.

[0010] Compared with the prior art, the beneficial effects of the technical scheme are as follows: the coarse cutter grains for rough machining and the fine cutter grains for fine machining are arranged at different positions of the stepped cutting portion, i.e., the fine cutter grains are arranged on the first cutting section and the coarse cutter grains are arranged on the second cutting section, so that rough machining and fine machining after rough machining can be performed without replacing the cutter through the integrated structure of rough machining and fine machining. The plurality of coarse cutter grains arranged on the first main cutter side wall and the second main cutter side wall make the rough machining more efficient. The single cutter grain arranged on the first main cutter side wall makes it easier to control the machining quality during fine machining.

[0011] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0012] In order to more clearly illustrate the technical scheme in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0013] Figure 1 is a structural perspective view of the present application;

[0014] Figure 2 is a structural front view of the present application;

[0015] Figure 3 is another structural perspective view of the present application.

[0016] Corresponding reference signs in the drawings are explained below:

[0017] shank-1,

[0018] cutting part-2,

[0019] first cutting section-211, second cutting section-212,

[0020] first base surface-221, second base surface-222, first space-223, second space-224, third space-225, fourth space-226,

[0021] first chip flute-231, first main flank wall-2311, first chip flanking wall-2312,

[0022] second chip flute-232, second main flank wall-2321, second chip flanking wall-2322,

[0023] coarse tool grain mounting groove-241,

[0024] fine tool grain mounting groove-251,

[0025] additional chip flute avoiding groove-261, first extension groove part-262, second extension groove part-263,

[0026] coarse tool grain-3,

[0027] fine tool grain-4. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the utility model.

[0029] Please refer to Figures 1-3 A coarse-fine integrated step drill includes a shank 1 and a cutting part 2 connected to one end of the shank 1. The shank 1 is used to be clamped by a corresponding clamping structure when CNC machining is performed, so as to be driven to rotate by a CNC machine tool.

[0030] The cutting portion 2 is in a cylindrical shape arranged along the length direction of the shank 1, and the rotational center line of the shank 1 coincides with the axis of the cutting portion 2. The cutting portion 2 comprises a first cutting section 211 connected with the shank 1, and a second cutting section 212 connected with the first cutting section 211 away from the shank 1, wherein the first cutting section 211 extends outwardly to make the diameter of the first cutting section 211 larger than the diameter of the second cutting section 212, and the extension line of the axis of the first cutting section 211 coincides with the axis of the second cutting section 212, i.e. the first cutting section 211 and the second cutting section 212 combine to form a stepped cutting portion.

[0031] The cutting portion 2 has a first base surface 221 and a second base surface 222 perpendicular to each other, both of which are parallel to the axis of the cutting portion 2, and the intersection line of the first base surface 221 and the second base surface 222 coincides with the axis of the cutting portion 2.

[0032] The cutting portion 2 has a first space 223, a second space 224, a third space 225 and a fourth space 226 separated by the first base surface 221 and the second base surface 222, the first space 223 and the third space 225 are diagonally distributed, and the second space 224 and the fourth space 226 are diagonally distributed. The cutting portion 2 has a first chip flute 231 and a second chip flute 232 formed on the outer side surface, the first chip flute 231 and the second chip flute 232 are respectively located on the first space 223 and the third space 225, and the first chip flute 231 and the second chip flute 232 are both arranged along the length direction of the cutting portion 2 from the end surface of the cutting portion 2 away from the shank, i.e. from the second cutting section 212 to the first cutting section 211.

[0033] The first chip flute 231 has a first main tool side wall 2311 parallel to the first base surface 221 and a first chip removal side wall 2312 parallel to the second base surface 222 on the first space 223, and the first main tool side wall 2311 and the first chip removal side wall 2312 are adjacent side walls.

[0034] The second chip flute 232 has a second main tool side wall 2321 parallel to the first base surface 221 and a second chip removal side wall 2322 parallel to the second base surface 222 on the third space 225, and the second main tool side wall 2321 and the second chip removal side wall 2322 are adjacent side walls.

[0035] The first main tool side wall 2311 of the second cutting section 212 and the second main tool side wall 2321 of the second cutting section 212 are both formed with a coarse grain mounting groove 241, the coarse grain mounting groove 241 has a first tool tip exposed opening outwardly communicating with the outer side surface of the second cutting section 212, and the coarse grain 3 is mounted on the coarse grain mounting groove 241, and the tool tip of the coarse grain 3 protrudes out of the outer side surface of the second cutting section 212 through the corresponding first tool tip exposed opening.

[0036] The first main tool side wall 2311 of the first cutting section 211 is formed with a fine tool grain mounting groove 251 having a second tool tip exposure opening communicating outwardly with the outer side surface of the first cutting section 211, and the fine tool grain 4 is mounted on the fine tool grain mounting groove 251, the tool tip of the fine tool grain 4 is exposed beyond the outer side surface of the first cutting section 211 through the second tool tip exposure opening, and in the axial direction of the cutting part 2, the distance between the tool tip of the fine tool grain 4 and the axis of the cutting part 2 is greater than the distance between the tool tip of the coarse tool grain 3 and the axis of the cutting part 2.

[0037] By providing the coarse tool grains for rough machining and the fine tool grains for fine machining at different positions of the stepped cutting part, i.e. providing the fine tool grains on the first cutting section and the coarse tool grains on the second cutting section, the rough machining and the fine machining after rough machining can be carried out without changing the tool through the integrated structure of rough machining and fine machining. By providing multiple coarse tool grains on the first active side wall and on the second tool side wall, the rough machining efficiency is higher. By providing a single tool grain on the first tool side wall, the machining quality is easier to control when fine machining is carried out.

[0038] In the embodiment, the first chip removal side wall 2312 of the first cutting section 211 is formed with an additional chip removal avoidance groove 261 corresponding to the fine tool grain 4, which has a first extension groove part 262 extending beyond the fine tool grain 4 in a direction away from the tool shank 1 and a second extension groove part 263 extending beyond the fine tool grain 4 in a direction close to the tool shank 1 in the axial direction of the cutting part 2.

[0039] The first chip removal groove 231 and the second chip removal groove 232 are provided so that the cutting part 2 has a main body part for ensuring the strength of the cutting part 2 in the second space 224 and the fourth space 226, and through the provision of the single fine tool grain (such as Figure 1 、 2 As shown, the fine tool grain is in the first space and the fourth space, the second space is reserved with more main body part, and thanks to the above design, the additional chip removal avoidance groove 261 can be provided for the fine tool grain 4 while ensuring that the overall strength of the cutting part 2 is at a high level, so that the chip removal effect is better when fine machining is carried out.

[0040] As shown in Figure 1 , the first extension groove part 262 and the second extension groove part 263 are both concave arc-shaped groove parts continuous with the additional chip removal avoidance groove 261, further improving the chip removal effect.

[0041] As shown in Figure 1 、 3As shown, in some embodiments, the coarse teeth on the first main side wall 2311 and the coarse teeth on the second main side wall 2321 are arranged in a 180° rotational symmetry along the axis of the cutting portion 2 (the second cutting section).

[0042] In some embodiments, the mounting connection mode of the teeth (coarse teeth 3, fine teeth 4) can be that after the teeth are placed on the corresponding tooth mounting groove, the teeth (the teeth themselves have a connection through hole) are connected to the corresponding screw hole on the cutting portion by screws or bolts (not shown).

[0043] In some embodiments, the inner wall of the first chip flute 231 and the second chip flute 232 near the inner wall of the shank 1 is a concave arc-shaped inner wall, which facilitates the discharge of debris.

[0044] It is obvious for those skilled in the art that the present application is not limited to the details of the above exemplary embodiments, and the present application can be implemented in other specific forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be regarded as exemplary and non-limiting, and the scope of the present application is defined by the appended claims rather than the above description, and therefore all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present application. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A roughing and finishing integrated step drill, comprising a shank and a cutting portion connected to one end of the shank, the cutting portion comprising a first cutting segment connected to the shank, and a second cutting segment connected to an end of the first cutting segment away from the shank; the first cutting segment extends outward so that the diameter of the first cutting segment is larger than the diameter of the second cutting segment, and the first cutting segment and the second cutting segment are combined to form a stepped cutting portion, characterized in that: A first chip removal groove and a second chip removal groove are formed on the outer surface of the second cutting segment. The first chip removal groove and the second chip removal groove both start from an end surface of the second cutting segment away from the tool holder and extend along the length direction of the cutting portion to the first cutting segment. The first chip removal groove has a first main tool side wall and a first chip removal side wall corresponding to the first chip removal side wall. The second chip discharge groove has a second main tool side wall and a second chip discharge side wall corresponding to the second main tool side wall; A coarse blade particle installation groove is formed on the first main blade side wall of the second cutting segment and the second main blade side wall of the second cutting segment. The coarse blade particle installation groove has a first blade tip exposed opening that is outwardly connected to the outer side surface of the second cutting segment. The coarse blade particle is installed in the coarse blade particle installation groove. The blade tip of the coarse blade particle protrudes from the outer side surface of the second cutting segment through the corresponding first blade tip exposed opening. A fine knife particle mounting groove is formed on the side wall of the first main knife of the first cutting segment. The fine knife particle mounting groove has a second knife tip exposed opening that is outwardly connected to the outer side surface of the first cutting segment. The fine knife particle is mounted on the fine knife particle mounting groove. The tip of the fine knife particle extends beyond the outer side surface of the first cutting segment through the second knife tip exposed opening, and in the axial direction of the cutting portion, the distance between the tip of the fine knife particle and the axis of the cutting portion is greater than the distance between the tip of the coarse knife particle and the axis of the cutting portion.

2. The roughing and finishing integrated step drill according to claim 1, characterized in that: An additional chip removal avoidance groove corresponding to the fine knife particles is formed on the first chip removal side wall of the first cutting section.

3. The roughing and finishing integrated step drill according to claim 2, characterized in that: The additional chip removal groove has, in the axial direction of the cutting portion, a first extending groove portion extending beyond the fine knife grain in a direction away from the tool handle and a second extending groove portion extending beyond the fine knife grain in a direction close to the tool handle.

4. The roughing and finishing integrated step drill according to claim 3, characterized in that: The first extension groove portion and the second extension groove portion are both inwardly concave arc-shaped groove portions continuous with the additional chip removal and avoidance grooves.

5. The roughing and finishing integrated step drill according to any one of claims 1 to 4, characterized in that: The coarse cutting grains on the side wall of the first main cutting tool and the coarse cutting grains on the side wall of the second main cutting tool are symmetrically arranged at 180 degrees with the axis of the second cutting section as the center line.

6. The roughing and finishing integrated step drill according to any one of claims 1 to 4, characterized in that: The inner walls of the first chip removal groove and the second chip removal groove close to the tool handle are concave arc-shaped inner walls.

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