Nail hole forming tool

Abstract

The present invention provides a nail hole forming tool, which relates to the technical field of CNC machining; it includes a body and a nail hole opened on the body, the nail hole includes an orifice and a hole bottom; along the direction away from the orifice, the nail hole is provided with a flaring section and a main section in sequence; the radial dimension of the inner wall of the flaring section is R1, and the value of R1 increases in sequence from one end of the flaring section away from the orifice to the end close to the orifice; an electroplating layer is provided in the nail hole, and the thickness of the electroplating layer in the flaring section is D, and the value of D increases in sequence in the direction away from the orifice; the radial dimension of the nail body adapted to the nail hole is R2; wherein R1‑2*D≥R2. The present invention sets a flaring section in the high potential area of ​​the nail hole, and as the potential increases, the radial dimension of the inner wall of the flaring section is designed to increase in sequence in the direction close to the orifice, so that each area of ​​the nail hole after electroplating can meet the specification requirements of subsequent nail hole processing, thereby improving the stability of machining.

Description

Technical Field

[0001] The invention relates to the technical field of numerical control machining, in particular to a nail hole forming tool. Background Art

[0002] Due to cost and other reasons, most of the mass-produced filter cavities currently use self-tapping screws instead of traditional screws, eliminating the step of tapping the threads on the cavity to reduce costs.

[0003] The self-tapping screw processing tool is formed by a drill bit and then electroplated. However, due to the potential difference in the formed hole, the plating thickness in different areas of the hole is different during the electroplating process, which leads to the inability to effectively control the size of the bottom hole of the self-tapping screw, and even fails to meet the processing requirements, resulting in a waste of processes and materials. Summary of the invention

[0004] The purpose of the present invention is to provide a nail hole forming tool to solve the problem that the size of the self-tapping nail bottom hole of the existing tool cannot be controlled or even cannot meet the processing requirements.

[0005] In order to solve the above technical problems, the present invention provides a nail hole forming tool, and the specific technical solution is as follows:

[0006] A nail hole forming tool comprises a body and a hole body provided on the body, wherein the hole body comprises a hole opening and a hole bottom;

[0007] Along the direction away from the orifice, the orifice body is provided with a flared section and a main section in sequence; the radial dimension of the inner wall of the flared section is R1, and the value of R1 increases in sequence from the end of the flared section away from the orifice to the end close to the orifice;

[0008] The hole body is provided with an electroplating layer, the thickness of the electroplating layer in the expansion section is D, and the value of D increases in a direction away from the hole mouth;

[0009] The radial dimension of the nail body adapted to the hole body is R2;

[0010] Wherein, in any section of the expansion section, R1-2*D≥R2.

[0011] Furthermore, the expansion section is a cone with openings at both ends;

[0012] Alternatively, the expansion section includes a plurality of cylindrical portions connected in sequence, and radial dimensions of inner walls of the plurality of cylindrical portions gradually increase along a direction from an end of the expansion section away from the orifice to an end of the expansion section close to the orifice.

[0013] Furthermore, when the expansion section is a conical cylinder with openings at both ends, the taper of the conical cylinder is 0.5° to 1°.

[0014] Further, at the end of the expansion section away from the orifice, the thickness of the electroplating layer is d;

[0015] At one end of the flared section close to the orifice, the radial dimension of the inner wall of the flared section is r;

[0016] Among them, r-R2≥n*d, 4≤n≤8.

[0017] Furthermore, d1≤d≤d2;

[0018] When d=d1, r-R2≥4*d;

[0019] When d=d2, r-R2≥8*d.

[0020] Furthermore, the d1 is greater than or equal to 4um and less than or equal to 6um; the d2 is greater than or equal to 7um and less than or equal to 9um.

[0021] Furthermore, a chip holding section is provided between the orifice and the flaring section;

[0022] The radial dimension of the inner wall of the chip holding segment is R3, and R3>R1.

[0023] Furthermore, the length of the chip section is greater than or equal to the difference between R3 and R1.

[0024] Furthermore, the difference between R3 and R1 is greater than or equal to 5 um and less than or equal to 8 um.

[0025] Furthermore, the length of the flared section is smaller than the length of the main body section, and the ratio of the length of the flared section to the length of the main body section is smaller than 1:3.

[0026] According to the nail hole forming tool provided by the present invention, a flaring section is set in the high potential area of ​​the nail hole, and as the potential increases, the radial size of the inner wall of the flaring section is designed to increase successively in the direction close to the hole mouth, so that each area of ​​the nail hole after electroplating can meet the specification requirements of subsequent nail hole processing, thereby improving the stability of machining. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the present invention 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 present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic structural diagram of a nail hole forming tool provided in an embodiment of the present invention.

[0029] icon:

[0030] 1-main body; 2-hole body; 3-hole mouth; 4-hole bottom; 5-expansion section; 6-main section; 7-chip holding section. DETAILED DESCRIPTION

[0031] The technical solution of the present invention will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention 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, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0033] In the description of the present invention, it should be noted that, 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; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] Combined with Figure 1 As shown, this embodiment provides a nail hole forming tool, which is used for processing equipment such as filters, and can be specifically applied to the self-tapping nail hole forming of the filter cavity. The nail hole forming tool of this embodiment includes a body 1 and a hole body 2 opened on the body 1. The body 1 of this embodiment is made of tungsten steel and other materials. The hole body 2 of this embodiment includes a hole mouth 3 and a hole bottom 4.

[0035] After the nail hole forming tool in this embodiment forms the hole body 2 through the drill, the hole body 2 is electroplated, and then the nail hole forming tool after forming the hole body 2 is used as a mold or an intermediate medium, and the information of the nail hole is obtained through CNC processing means such as instrument scanning, and the information is applied to the filter waiting processing instrument to form the self-tapping nail hole.

[0036] However, during the actual processing, the inventors found that due to the potential difference in the hole body 2 itself, the thickness of the electroplating layer cannot be effectively controlled, and the thickness of the electroplating layer in the high potential area is greater than the thickness of the electroplating layer in the low potential area. If the hole body 2 is formed according to the existing processing method, the radial dimensions of each area of ​​the hole body 2 are the same, which will cause the inner wall of the hole body 2 after electroplating to be different in size at the high potential and low potential, and thus the size of the bottom hole of the subsequent self-tapping screw cannot be effectively controlled.

[0037] Based on this, the present embodiment improves the structural form of the hole body 2. In the direction away from the orifice 3, the hole body 2 of the present embodiment is sequentially provided with a flared section 5 and a main section 6. Except for the connection between the two, the radial dimension of the inner wall of the flared section 5 is greater than the radial dimension of the inner wall of the main section 6. The radial dimension of the inner wall of the flared section 5 is R1, and the value of R1 increases sequentially from the end of the flared section 5 away from the orifice 3 to the end close to the orifice 3.

[0038] Similarly, in the hole body 2 of this embodiment, a plating layer (not shown in the figure) needs to be provided after the hole is formed. The thickness of the plating layer in the expansion section 5 is D. Due to the potential difference, the value of D increases successively in the direction away from the hole opening 3.

[0039] In this embodiment, the radial dimension of the nail body of the self-tapping screw (not shown in the figure) adapted to the hole body 2 is R2 (since the self-tapping screw structure is not shown in the accompanying drawings, R2 is not marked in this embodiment); in order to solve the above technical problems, in this embodiment, the expansion section 5 is constructed as follows: in any section of the expansion section 5, R1-2*D≥R2, that is, the inner diameter of the expansion section 5 after electroplating can be equal to or slightly larger than the radial dimension of the nail body.

[0040] This structure arranges a flared section 5 in the high potential area of ​​the hole body 2, and as the potential increases, the radial dimensions of the inner wall of the flared section 5 are designed to increase successively in the direction close to the hole mouth 3, so that each area of ​​the hole body 2 after electroplating can meet the specification requirements of the subsequent hole body 2 processing, and the stability of the subsequent mechanical processing of the hole can be improved.

[0041] As a preferred implementation of this embodiment, the expansion section 5 of this embodiment is a conical cylinder with openings at both ends. This structure can adapt well to the thickness variation trend of the electroplating layer therein, ensuring that the inner diameter of the nail hole after electroplating can be basically the same as the radial size of the nail body.

[0042] Of course, the structural form of the expanded section 5 implemented in this embodiment is not limited to this. For example, the expanded section 5 of this embodiment can also include multiple cylindrical parts connected in sequence (this form is not shown in the figure), and the radial dimensions of the inner walls of the multiple cylindrical parts gradually increase along the direction from the end of the expanded section 5 away from the orifice 3 to the end close to the orifice 3, which can also ensure that the bottom hole of the self-tapping screw formed subsequently meets the installation requirements of the self-tapping screw.

[0043] As a preferred implementation mode of this embodiment, when the flared section 5 is a conical cylinder with openings at both ends, the taper of the conical cylinder of this embodiment is 0.5° to 1°, and more preferably 0.7°. This design is based on the inventor's proof through a large number of experiments that when the taper of the flared section 5 is the above-mentioned angle, it can form a vertical or nearly vertical inner wall with the electroplating layer after electroplating, which is more suitable for self-tapping screws.

[0044] As a preferred implementation of this embodiment, at the end of the flared section 5 away from the orifice 3, the thickness of the electroplating layer is d; at the end of the flared section 5 close to the orifice 3, the radial dimension of the inner wall of the flared section 5 is r; wherein, r-R2≥n*d, 4≤n≤8. This structural design is based on the above-mentioned cone structure to ensure that the maximum dimension of the flared section 5 with a gradually changing inner diameter dimension meets the requirements.

[0045] Since the thickness of the coating is also within a variation range, that is, d1≤d≤d2, the inventors have found through a large number of experiments that d1 is generally greater than or equal to 4um and less than or equal to 6um; d2 is generally greater than or equal to 7um and less than or equal to 9um.

[0046] This embodiment takes r as 2.82mm, d2 as 8um, and d1 as 5um as an example; when d=d2, r-R2≥8*d, and the high potential is 4 times the maximum coating thickness, that is, 0.008mm*4*2=0.064mm on both sides, and the maximum size-thickest coating thickness is 2.82mm-0.064mm=2.756mm, which meets the pass rate of 2.75mm self-tapping screws.

[0047] When d=d1, r-R2≥4*d; the thinnest coating is 5um, and the high potential is twice the coating thickness, that is, 0.005mm*2*2=0.02mm on both sides, the maximum size-the thickest coating thickness is 2.82-0.02=2.8, which meets the pass rate of 2.8mm self-tapping screws.

[0048] Based on the above structure, as a preferred implementation of this embodiment, a chip accommodating section 7 is provided between the hole opening 3 and the flaring section 5 of this embodiment, and metal chips during installation and removal of the screw can be accumulated in the chip accommodating section 7 to avoid affecting the structural dimensions of the hole body 2. Moreover, the radial dimension of the inner wall of the chip accommodating section 7 is R3, and R3>R1 is required to meet the chip accommodating requirement.

[0049] In order to take into account both the chip holding performance and the size requirements of the hole body 2 itself, as a preferred implementation of this embodiment, the length of the chip holding segment 7 of this embodiment is greater than or equal to the difference between R3 and R1. The inventors have found through a large number of experiments that, under normal circumstances, the difference between R3 and R1 is greater than or equal to 5um and less than or equal to 8um.

[0050] As a preferred implementation of this embodiment, the length of the flared section 5 of this embodiment is less than the length of the main section 6, and the ratio of the length of the flared section 5 to the length of the main section 6 is less than 1:3. This design is also determined by the inventor through a large number of experiments, that is, to determine the influence area of ​​the high and low potential differences in the hole body 2, to avoid the flared section 5 being too long or too short to play the corresponding function.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A nail hole forming tool, comprising a body and a hole body formed on the body, wherein the hole body comprises a hole opening and a hole bottom; It is characterized in that Along the direction away from the orifice, the orifice body is provided with a flared section and a main section in sequence; the radial dimension of the inner wall of the flared section is R1, and the value of R1 increases in sequence from the end of the flared section away from the orifice to the end close to the orifice; The hole body is provided with an electroplating layer, the thickness of the electroplating layer in the expansion section is D, and the value of D increases in a direction away from the hole mouth; The radial dimension of the nail body adapted to the hole body is R2; Wherein, in any section of the expansion section, R1-2*D≥R2; A chip holding section is provided between the orifice and the flaring section; The length of the flared section is shorter than the length of the main body section.

2. The nail hole forming tool according to claim 1, characterized in that: The expansion section is a cone with openings at both ends; Alternatively, the expansion section includes a plurality of cylindrical portions connected in sequence, and radial dimensions of inner walls of the plurality of cylindrical portions gradually increase along a direction from an end of the expansion section away from the orifice to an end of the expansion section close to the orifice.

3. The nail hole forming tool according to claim 2, characterized in that: When the expansion section is a cone cylinder with openings at both ends, the taper of the cone cylinder is 0.5° to 1°.

4. The nail hole forming tool according to claim 1, characterized in that: At the end of the expansion section away from the orifice, the thickness of the electroplating layer is d; At one end of the flared section close to the orifice, the radial dimension of the inner wall of the flared section is r; Among them, r-R2≥n*d, 4≤n≤8.

5. The nail hole forming tool according to claim 4, characterized in that: d1≤d≤d2; When d=d1, r-R2≥4*d; When d=d2, r-R2≥8*d.

6. The nail hole forming tool according to claim 5, characterized in that: The d1 is greater than or equal to 4um and less than or equal to 6um; the d2 is greater than or equal to 7um and less than or equal to 9um.

7. The nail hole forming tool according to any one of claims 1 to 6, characterized in that: The radial dimension of the inner wall of the chip holding segment is R3, and R3>R1.

8. The nail hole forming tool according to claim 7, characterized in that: The length of the chip section is greater than or equal to the difference between R3 and R1.

9. The nail hole forming tool according to claim 7, characterized in that: The difference between R3 and R1 is greater than or equal to 5 um and less than or equal to 8 um.

10. The nail hole forming tool according to any one of claims 1 to 6, characterized in that: The ratio of the length of the flared section to the length of the main body section is less than 1:3.

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