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Small-diameter precision blind hole machining method

A processing method and small-diameter technology, applied in the field of mechanical processing, can solve problems such as hole diameter out-of-tolerance, achieve the effects of improving processing quality, ensuring hole position accuracy, and avoiding drill bit swing

Active Publication Date: 2018-02-23
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems in the prior art, the present invention proposes a small-diameter precision blind hole processing method, which can avoid the drill bit swing and the reamer swing caused by the axial force caused by the interference between the end of the reamer and the bottom of the blind hole. The problem of out-of-tolerance hole diameter, thus improving the processing quality

Method used

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  • Small-diameter precision blind hole machining method

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Example 1, see Figure 1a~1b , the schematic diagram of the structure of the aero-engine linkage half-ring, there are two T-shaped ring grooves with a width of 2 mm on the upper and lower ends of the annular groove of the half-ring, and two diameters are designed in the middle of the joint surface 2 of the half-ring and the T-shaped groove. φ3mm, 3mm deep blind hole 1.

[0032] The processing method is as follows:

[0033] 1) Countersink: use a φ2.8mm countersink (milling cutter) to countersink, and the depth of the countersink is 3.4mm;

[0034] 2) Boring: Boring diameter ф2.9mm, boring depth 3.3mm;

[0035] 3) Test reaming: Trial cutting on the test piece of the same material, and eliminate the over-tolerance of the aperture size caused by the out-of-tolerance of the diameter of the reamer;

[0036] 4) Reaming: use a reamer that has been tested for reaming, and the reaming depth is 3.2mm;

[0037] 5) Measure the pore diameter, using an inner dial gauge to measure ...

Embodiment 2

[0038] Example 2, see Figure 2a-2b , the schematic diagram of the blind hole structure in the inner casing of the aero-engine, there is an annular end face groove 3 with a width of 2.32mm designed on the large end face of the casing, and there are four blind holes 1 of φ3mm distributed in the middle of the annular end face groove 3. There are also 16 φ5mm holes designed on the side of the big end.

[0039] The processing method is as follows:

[0040] 1) Countersink: use a φ2.8mm countersink to countersink, and the depth of the countersink is 3.4mm;

[0041] 2) Boring: Boring diameter φ2.9mm, boring depth 3.3mm;

[0042] 3) Trial reaming: Trial cutting at the position of the φ5mm hole on the end surface of the part, and eliminate the out-of-tolerance hole size caused by the out-of-tolerance diameter of the reamer;

[0043] 4) Reaming: use a reamer that has been tested for reaming, and the reaming depth is 3.2mm;

[0044] 5) Measure the pore diameter, using an inner dial g...

Embodiment 3

[0045] Example 3, see Figure 3a~3c , a schematic diagram of the blind hole structure of the aero-engine compressor casing, the casing includes the upper half 4 and the lower half 5, in the middle of the T-shaped slot on the joint surface 6 of the upper half 4 of the casing, one φ3 needs to be processed +0. 015mm, depth 3 +0.5 The blind hole 1.

[0046] The processing method is as follows:

[0047] 1) Countersink: use a φ2.8mm countersink (milling cutter) to countersink, and the depth of the countersink is 3.4mm;

[0048] 2) Boring: Boring diameter φ2.9mm, boring depth 3.3mm;

[0049] 3) Test reaming: Trial cutting on the test piece of the same material, and eliminate the over-tolerance of the aperture size caused by the out-of-tolerance of the diameter of the reamer;

[0050] 4) Reaming: use a reamer that has been tested for reaming, and the reaming depth is 3.2mm;

[0051] 5) Measure the pore diameter, using an inner dial gauge to measure the pore diameter.

[0052] The ...

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Abstract

The invention discloses a small-diameter precision blind hole machining method. The purpose is to avoid the problems that a drill bit swings and the hole diameter is out of tolerance due to reamer swing caused by the axial force caused by interference of the end part of a reamer and the bottom of a blind hole, so that the machining quality is improved. According to the adopted technical scheme, the machining method comprises the following steps that 1), the drill bit is used for drilling a bottom hole in a workpiece requiring blind hole drilling, wherein the depth of the bottom hole is the maximum depth of the blind hole; 2), counter sinking is carried out by using a countersink or a milling cutter, wherein the machining depth of a countersunk hole is the same as the depth of the bottom hole; 3), boring is carried out after counter sinking, wherein the machining depth of a bored hole is smaller than the depth of the bottom hole; and 4), the reamer is used for reaming, wherein the diameter of the reamer is the same as the diameter of the blind hole, the machining depth of a reamed hole is smaller than the machining depth of the bored hole, and thus machining of the small-diameter precision blind hole is completed.

Description

technical field [0001] The invention relates to the technical field of mechanical processing, in particular to a processing method for small-diameter precision blind holes. Background technique [0002] In the structure of the open case parts and ring parts of modern aero-engines, it is often designed to drill several small holes on the end face in the middle of the annular groove on the end face of the case, or in the middle of the annular groove on the inner wall of the case at the joint surface of the open case. Drill several small holes in the end face. The diameter of the small hole is generally between ф1-ф3mm, and the hole diameter tolerance is only +0.015mm. In the structure of this kind of hole, the typical feature is that the hole is located in the middle of the groove, and the hole wall is only processed on the solid material on both sides of the groove, and the grooved part is an open space because the part material has been removed, so it is not necessary to dr...

Claims

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Application Information

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IPC IPC(8): B23P15/00
CPCB23P15/00
Inventor 王元祥姚军吴惠雯刘军团赵昌张艺军
Owner AECC AVIATION POWER CO LTD
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