One-time forming drill bit

Abstract

The utility model belongs to the technical field of drill bits, and particularly relates to a one-time forming drill bit. The one-time forming drill bit comprises a cutter body 1 and a drill bit body 2, wherein the cutter body 1 comprises two centrosymmetric spiral grooves 11 and two centrosymmetric outer blade parts 12; the outer wall of the outer edge part 12 comprises an entering surface 121, a front edge band 122, a groove part 123 and a rear edge band 124 which are sequentially connected according to the sequence of being in contact with a material to be processed; wherein the entering surface 121 is a plane and is tangent to a circle which is located at the front end of the entering surface 121 and is coaxial with the axis of the cutter body 1. The entering face is arranged on the front side of the front edge strip, and after cutting machining, the edge strip further extrudes the machined surface, so that the machined surface reaches high smoothness; and on the other hand, support between the drill bit and the machined material is more powerful, shaking is not prone to occurring, and the hole machining precision is further improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of drill bits, and in particular relates to a disposable forming drill bit. Background Art

[0002] At present, the hole processing accuracy of ordinary drill bits on the market is generally IT9 and above. For accuracy requirements higher than IT9, the drill bit often needs to be used in conjunction with the corresponding reamer to meet customer requirements; the hole wall finish of the drill bits on the market is generally Ra3.2 after processing. For scenarios where the hole wall finish requirement is higher than Ra3.2, it is often necessary to use it in conjunction with a reamer.

[0003] It can be seen that the existing drill bits cannot meet the requirements of modern parts for hole processing accuracy and smoothness due to the accuracy and smoothness of the holes they process. If a reamer is added, the processing steps will be complicated, the number of tools will be large, the processing efficiency will be low, and the reamer life will be short, which will increase costs for customers. Utility Model Content

[0004] The purpose of the utility model is to provide a disposable forming drill bit to solve the technical problem that the existing drill bit cannot be formed in one go to meet the accuracy and smoothness requirements of the processed hole, and needs to be used with a reamer subsequently to increase the working process.

[0005] The present application provides a disposable drill bit. The disposable drill bit comprises:

[0006] A blade body comprising two centrosymmetrical spiral grooves and two centrosymmetrical outer blade portions;

[0007] The outer wall of the outer blade portion includes an entry surface, a front edge band, a groove portion and a rear edge band connected in sequence in the order of contact with the material to be processed;

[0008] The entry surface is a plane and is tangent to a circle coaxial with the axis of the cutter body where the front end of the entry surface is located;

[0009] The front land and the rear land are both arc surfaces coaxial with the axis of the cutter body;

[0010] The diameter of the front end of the entry surface is smaller than the diameter of the front end of the front land by 0.01 mm to 0.1 mm.

[0011] In one embodiment of the present application, the plane tangent to the front end of the front land is P1, and the plane where the entry surface is located is P2;

[0012] The included angle β between P1 and P2 is 1° to 12°.

[0013] In one embodiment of the present application, the diameter of the blade body is D;

[0014] The axial length of the entry surface is 0.5D to 3D.

[0015] In one embodiment of the present application, the width a of the entry surface is 0.1 mm to 0.4 mm.

[0016] In one embodiment of the present application, an inner cooling channel is provided inside the outer blade portion.

[0017] In one embodiment of the present application, the back taper of the blade body is (0.05-0.4) mm / 100 mm.

[0018] In one embodiment of the present application, the core thickness of the blade body is 28% to 40% of the diameter of the blade body, and the groove width ratio is (0.6 to 1.0):1.

[0019] In one embodiment of the present application, the widths of the front land and the rear land are 3% to 15% of the diameter of the cutter body.

[0020] The beneficial effects of the present invention are as follows: the disposable forming drill bit of the present invention is provided with an entry surface on the front side of the front cutting edge. During processing, the entry surface will first contact the material to be processed and cut the material. Since the entry surface is slightly lower than the cutting edge diameter set by the drill bit, the cutting edge will further squeeze the processed surface after the cutting process, so that it can achieve a relatively high degree of smoothness. On the other hand, due to the setting of the entry surface, the support between the drill bit and the material to be processed is more powerful and not easy to shake, thereby further improving the accuracy of hole processing. The reaming process can be omitted in traditional processing that requires a reamer, thereby greatly reducing the tool cost and processing time, making the processing more economical.

[0021] Other features and advantages of the present invention will be described in the following description, and in part will become apparent from the description, or understood by practicing the present invention. The purpose and other advantages of the present invention are realized and obtained by the structures particularly pointed out in the description and the drawings.

[0022] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1This is a cross-sectional view of the disposable molding drill bit of the utility model;

[0025] Figure 2 It is a partial three-dimensional diagram of the disposable molding drill bit of the utility model;

[0026] Figure 3 It is a schematic diagram of the outer blade portion of a preferred embodiment of the present utility model;

[0027] Figure 4 yes Figure 1 Enlarged view of point A in the middle.

[0028] In the picture:

[0029] The cutter body 1 , the spiral groove 11 , the outer blade portion 12 , the entry surface 121 , the front land 122 , the groove portion 123 , the rear land 124 , and the inner cooling channel 125 . DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0031] This application provides a disposable molded drill bit, which is described in detail below. It should be noted that the order in which the following embodiments are described does not limit the preferred order of the embodiments of this application. Furthermore, in the following embodiments, the description of each embodiment has its own emphasis. For details not described in one embodiment, please refer to the relevant descriptions of other embodiments.

[0032] See also Figures 1 to 4 In one embodiment of the present application, a disposable drill bit includes: a cutter body 1 including two centrosymmetrical spiral grooves 11 and two centrosymmetrical outer blades 12;

[0033] The outer wall of the outer blade portion 12 includes an entry surface 121, a front edge band 122, a groove portion 123 and a rear edge band 124, which are connected in sequence in the order of contact with the material to be processed; wherein the entry surface 121 is a plane and is tangent to the circle coaxial with the axis of the cutter body 1 where the front end of the entry surface 121 is located; the front edge band 122 and the rear edge band 124 are both arc surfaces coaxial with the axis of the cutter body 1; the diameter of the front end of the entry surface 121 is 0.01mm to 0.1mm smaller than the diameter of the front end of the front edge band 122.

[0034] In this embodiment, an entry surface 121 is provided on the front side of the front edge band 122. During processing, the entry surface 121 will first contact the material to be processed and cut the material. Since the entry surface 121 is slightly lower than the diameter of the front edge band 122, after the cutting process, the front edge band 122 will further squeeze the processed surface to achieve a relatively high degree of smoothness. On the other hand, due to the provision of the entry surface 121, the support between the drill bit and the material to be processed is stronger and less likely to shake, thereby further improving the accuracy of hole processing. The reaming process can be omitted in traditional processing that requires a reamer, thereby greatly reducing the tool cost and processing time, making the processing more economical.

[0035] Optional, see Figure 4 The plane tangent to the front end of the front land 122 is P1, and the plane where the entry surface 121 is located is P2; the angle β between P1 and P2 is 1° to 12°.

[0036] Optionally, the diameter of the blade body 1 is D; the axial length of the entry surface 121 is 0.5D to 3D.

[0037] Optionally, the width a of the entry surface 121 is 0.1 mm to 0.4 mm.

[0038] Optionally, an inner cooling channel 125 is provided inside the outer blade portion 12 to cool the blade body 1 .

[0039] Optionally, the back taper of the cutter body 1 is (0.05-0.4) mm / 100 mm. The specific back taper is set according to the characteristics of the material being processed.

[0040] Optionally, the core thickness L of the blade body 1 is 28% to 40% of the diameter of the blade body 1 , and the groove width ratio is (0.6 to 1.0):1.

[0041] Optionally, the width of the front land 122 and the rear land 124 is 3% to 15% of the diameter of the cutter body 1, which can be determined according to the characteristics of the processed material.

[0042] The various devices selected in this application (components whose specific structures are not described) are all universal standard parts or components known to those skilled in the art, and their structures and principles can be known to those skilled in the art through technical manuals or conventional experimental methods.

[0043] In the description of the embodiments of the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection.

[0044] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating positions or relationships, are based on the positions or relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0045] Based on the above-mentioned ideal embodiment of the present invention, and in accordance with the above description, relevant personnel can make various changes and modifications without departing from the technical scope of the present invention. The technical scope of the present invention is not limited to the content of the specification, but must be determined according to the scope of the claims.

Claims

1. A disposable drill bit, characterized in that: include: A blade body (1) comprising two centrosymmetrical spiral grooves (11) and two centrosymmetrical outer blade portions (12); The outer wall of the outer blade portion (12) comprises an entry surface (121), a front edge band (122), a groove portion (123) and a rear edge band (124) which are sequentially connected in the order of contact with the material to be processed; The entry surface (121) is a plane and is tangent to a circle coaxial with the axis of the blade body (1) where the front end of the entry surface (121) is located; The front edge band (122) and the rear edge band (124) are both arc surfaces coaxial with the axis of the cutter body (1); The diameter of the front end of the entry surface (121) is smaller than the diameter of the front end of the front land (122) by 0.01 mm to 0.1 mm.

2. The disposable drill bit according to claim 1, characterized in that: The plane tangent to the front end of the front land (122) is P1, and the plane where the entry surface (121) is located is P2; The included angle β between P1 and P2 is 1° to 12°.

3. The disposable drill bit according to claim 1, characterized in that: The diameter of the blade body (1) is D; The axial length of the entry surface (121) is 0.5D to 3D.

4. The disposable drill bit according to claim 1, characterized in that: The width a of the entry surface (121) is 0.1 mm to 0.4 mm.

5. The disposable drill bit according to claim 1, characterized in that: An inner cooling channel (125) is provided inside the outer blade portion (12).

6. The disposable drill bit according to claim 1, characterized in that: The back taper amount of the blade body (1) is (0.05-0.4) mm / 100 mm.

7. The disposable drill bit according to claim 1, characterized in that: The core thickness of the blade body (1) is 28% to 40% of the diameter of the blade body (1), and the groove width ratio is (0.6 to 1.0):

1.

8. The disposable drill bit according to claim 1, characterized in that: The width of the front land (122) and the rear land (124) is 3% to 15% of the diameter of the cutter body (1).

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