Tool and method for chamfering front side and back side of through hole in double-layer narrow groove space

Abstract

The invention relates to the technical field of aero-engine manufacturing, in particular to a tool and method for chamfering the front face and the back face of a through hole in a double-layer narrow groove space. The chamfering tool comprises a first rod body, a second rod body and a U-shaped rod; the axes of the first rod body and the second rod body are collinear, and the first rod body and the second rod body are arranged at intervals; the first rod body and the second rod body are connected through a U-shaped rod; a bearing is mounted at the end head of the cantilever end of the first rod body; a chamfering cutter is mounted at the end head of the cantilever end of the second rod body in a detachable connection manner; the diameter of the second rod body is smaller than that of a through hole to be chamfered in the hanging ring. By means of the tool and the method, the problem that chamfering of through holes in the first hanging ring and the second hanging ring on the stress application barrel is difficult is solved. By means of the chamfering tool, front and back chamfering can be conducted on through holes in the first hanging ring and the second hanging ring, and the chamfering tool is convenient to manufacture and use and easy to operate.

Description

Technical Field

[0001] The invention relates to the technical field of aero-engine manufacturing, and in particular to a tool and a method for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space. Background Art

[0002] There are generally bolt holes of varying sizes on the mounting edges and hanging rings of aircraft engine barrel and casing components. These bolt holes are chamfered after drilling, and usually there are strict requirements on the chamfer size of the holes to meet the assembly requirements of the bolts.

[0003] Figure 1 The figure shows a typical schematic diagram of the structure of an aircraft engine afterburner cylinder, which is welded by a mounting edge 101, a cylinder body 102 and a hanging ring 103. The hanging ring 103 is a double-layer structure, including a first hanging ring 103a and a second hanging ring 103b arranged at intervals. After being welded together, mechanical processing is performed, wherein the processing of the mounting edge 101 and the hanging ring 103 involves: turning, milling, drilling and chamfering.

[0004] Since the force cylinder 100 is machined after the installation edge 101, the cylinder body 102 and the hanging ring 103 are welded, the hanging ring 103 is far away from the cylinder end face after welding, and the hanging ring 103 has a double-layer structure. As a result, the chamfering of the through hole on the hanging ring 103 is similar to the front and back chamfering of the hole in a narrow deep cavity, and the hanging ring 103 has a double-layer narrow groove structure, that is, a narrow groove is formed between the first hanging ring 103a and the second hanging ring 103b, and the ordinary chamfering tool cannot be inserted into the narrow deep cavity to chamfer the front and back of the hole. Summary of the invention

[0005] The main purpose of the present invention is to provide a tool and method for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space, aiming to solve the above-mentioned technical problems.

[0006] To achieve the above-mentioned purpose, on the one hand, the present invention proposes a tool for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space, comprising a first rod body, a second rod body and a U-shaped rod; the axes of the first rod body and the second rod body are colinear, and the two are arranged at an interval; the first rod body and the second rod body are connected by a U-shaped rod; a bearing is installed at the end of the cantilever end of the first rod body; a chamfering knife is installed at the end of the cantilever end of the second rod body through a detachable connection; the diameter of the second rod body is smaller than the diameter of the through hole to be chamfered on the hanging ring.

[0007] Preferably, a threaded section is provided on the end of the cantilever end of the second rod body, and an outer cylindrical surface of the threaded section is provided with an external thread; a threaded hole is provided at the center of the chamfering cutter; the chamfering cutter is connected to the threaded section on the end of the second rod body through the threaded hole.

[0008] Preferably, the length of the thread segment is not less than 20 mm.

[0009] Preferably, a rotating sleeve is sleeved on the cross bar of the U-shaped rod; the inner hole of the rotating sleeve is clearance-matched with the cross bar of the U-shaped rod.

[0010] Preferably, the first rod body, the second rod body and the U-shaped rod are formed by bending the same rod body.

[0011] Preferably, the distance between the two side bars of the U-shaped bar is t, satisfying: 120mm≤t≤200mm.

[0012] On the other hand, the present invention also provides a method for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space, using the above-mentioned tool for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space, comprising the following steps:

[0013] S1. Chamfer the hole on the front side of the first hanging ring: install the chamfering cutter on the end of the cantilever end of the second rod body in a positive direction, so that the conical cutting part of the chamfering cutter is set in a direction away from the first rod body; the conical cutting part of the chamfering cutter is pressed against the hole on the front side of the first hanging ring, hold the bearing with one hand, hold the cross bar of the U-shaped rod with the other hand and rotate, so as to drive the chamfering cutter to rotate for chamfering;

[0014] S2. Chamfer the hole on the back side of the first hanging ring: remove the chamfering cutter from the second rod body, pass the second rod body through the through hole of the first hanging ring, and then reversely install the chamfering cutter on the end of the cantilever end of the second rod body, so that the conical cutting part on the chamfering cutter is arranged in the direction of the first rod body, and the conical cutting part on the chamfering cutter is placed against the hole on the back side of the first hanging ring. Hold the bearing with one hand and hold the cross bar of the U-shaped rod with the other hand to rotate, so as to drive the chamfering cutter to rotate for chamfering;

[0015] S3. Chamfer the hole on the front side of the second hanging ring: remove the chamfering cutter from the second rod body, pass the second rod body through the through hole of the first hanging ring, and then install the chamfering cutter on the end of the cantilever end of the second rod body in a positive direction, so that the conical cutting part on the chamfering cutter is arranged in a direction away from the first rod body, and the conical cutting part on the chamfering cutter is placed against the hole on the front side of the second hanging ring. Hold the bearing with one hand and hold the cross bar of the U-shaped rod with the other hand to rotate, so as to drive the chamfering cutter to rotate for chamfering;

[0016] S4. Chamfer the hole on the back side of the second hanging ring: remove the chamfering knife from the second rod body, pass the second rod body through the through holes of the first hanging ring and the second hanging ring, and then reversely install the chamfering knife on the end head of the cantilever end of the second rod body, so that the conical cutting part on the chamfering knife is set in the direction of the first rod body, and the conical cutting part on the chamfering knife is placed against the hole on the back side of the second hanging ring. Hold the bearing with one hand and hold the cross bar of the U-shaped rod with the other hand to rotate, thereby driving the chamfering knife to rotate for chamfering.

[0017] Preferably, in the steps S1 to S4, an axial force is applied while holding the bearing, so that the conical cutting portion on the chamfering tool is closely against the hole to be chamfered.

[0018] Preferably, in the steps S1 to S4, when chamfering is performed, the axis of the second rod body is always kept coincident with the axis of the through hole to be chamfered.

[0019] Preferably, before the chamfering operation is performed, the distance from the hanging ring to the end faces of both ends of the force cylinder is determined, and the chamfering operation is performed at the end where the hanging ring is closest to the end face.

[0020] Due to the adoption of the above technical solution, the beneficial effects of the present invention are as follows:

[0021] (1) By adopting the tool and method for chamfering the front and back sides of the through hole in the double-layer narrow groove space provided by the present invention, the problem of difficulty in chamfering the through holes on the first hanging ring and the second hanging ring on the force cylinder is solved. The chamfering tool can be used to chamfer the front and back sides of the through holes on the first hanging ring and the second hanging ring. The chamfering tool is easy to manufacture, easy to use, and simple to operate.

[0022] (2) The chamfering tool and method provided by the present invention have a wide range of applications and can be extended to structures with multiple layers of hanging rings. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0024] Figure 1 This is a schematic diagram of the structure of the afterburner cylinder of an aircraft engine;

[0025] Figure 2 A structural diagram of a tool for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space provided by the present invention;

[0026] Figure 3 for Figure 2 Middle AA section view;

[0027] Figure 4 It is a structural schematic diagram of the chamfering cutter in the present invention;

[0028] Figure 5 for Figure 4 Middle CC section view;

[0029] Figure 6 It is a schematic diagram of chamfering the hole on the front side of the first hanging ring in the present invention;

[0030] Figure 7 It is a schematic diagram of chamfering the hole on the back side of the first hanging ring in the present invention;

[0031] Figure 8 It is a schematic diagram of chamfering the hole on the front side of the second hanging ring in the present invention;

[0032] Fig. 9 It is a schematic diagram of chamfering the hole on the back side of the second hanging ring in the present invention.

[0033] Explanation of the accompanying drawings: 1. first rod body; 2. second rod body; 2a. threaded section; 3. U-shaped rod; 4. bearing; 5. chamfering cutter; 5a. threaded hole; 6. rotating sleeve; 100. force cylinder; 101. mounting edge; 102. cylinder body; 103. hanging ring; 103a. first hanging ring; 103b. second hanging ring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not 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.

[0035] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] Combination Figure 1 As shown, it is a schematic diagram of the structure of the afterburner cylinder 100 of the aircraft engine. The afterburner cylinder 100 is welded by the mounting edge 101, the cylinder body 102 and the hanging ring 103. The hanging ring 103 is a double-layer structure, including a first hanging ring 103a and a second hanging ring 103b arranged at intervals. The total height of the afterburner cylinder 100 is 950mm, wherein the chamfered surface on the hanging ring 103 is 178mm away from the large end of the cylinder and 715mm away from the small end of the cylinder. After the hanging ring 103 is machined, the through hole on the hanging ring 103 is manually chamfered.

[0038] Combination Figures 2 to 5 As shown, on the one hand, this embodiment provides a tool for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space, comprising a first rod body 1, a second rod body 2 and a U-shaped rod 3; the axes of the first rod body 1 and the second rod body 2 are colinear, and the two are arranged at an interval; the first rod body 1 and the second rod body 2 are connected by the U-shaped rod 3; a bearing 4 is installed at the end of the cantilever end of the first rod body 1; a chamfering knife 5 is installed at the end of the cantilever end of the second rod body 2 through a detachable connection; the diameter of the second rod body 2 is smaller than the diameter of the through hole to be chamfered on the hanging ring 103.

[0039] Specifically, a threaded segment 2a is provided on the end of the cantilever end of the second rod body 2, and an external thread is provided on the outer cylindrical surface of the threaded segment 2a; a threaded hole 5a is provided at the center of the chamfering cutter 5; the chamfering cutter 5 is connected to the threaded segment 2a on the end of the second rod body 2 through the threaded hole 5a to form a detachable connection structure.

[0040] In order to ensure the stability of the connection of the chamfering cutter 5, the length of the threaded section 2a is required to be no less than 20 mm.

[0041] In order to facilitate the rotation of the U-shaped rod 3 and avoid the operator's hand from directly rubbing against the crossbar of the U-shaped rod 3, a rotating sleeve 6 is sleeved on the crossbar of the U-shaped rod 3; the inner hole of the rotating sleeve 6 is in clearance with the crossbar of the U-shaped rod 3, so that the rotating sleeve 6 can rotate on the crossbar of the U-shaped rod 3.

[0042] In order to facilitate the manufacture of the entire chamfering tool, the first rod body 1, the second rod body 2, and the U-shaped rod 3 are formed by bending the same rod body.

[0043] Combination Figure 2 As shown, the distance between the two side bars of the U-shaped bar 3 is t, which satisfies: 120mm≤t≤200mm, so as to be suitable for the operator to hold the rotating sleeve 6 in the palm of his hand.

[0044] Combination Figures 6 to 9 As shown, this embodiment also provides a method for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space, and the chamfering is performed using the tool for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space.

[0045] Before chamfering, determine the distance between the hanging ring 103 and the end faces of the two ends of the force cylinder 100, and choose to chamfer at the end of the hanging ring 103 that is closest to the end face. Since the hanging ring 103 is closer to the end face of the large end where the mounting edge 101 is located, the chamfering operation is selected at the large end position.

[0046] In this embodiment, the front side and the back side of the first hanging ring 103a and the second hanging ring 103b are agreed as follows: the plane of the first hanging ring 103a and the second hanging ring 103b close to the installation edge 101 is regarded as the front side, and the plane away from the installation edge 101 is regarded as the back side. Specifically, the following steps are included:

[0047] S1. Chamfer the hole on the front side of the first hanging ring 103a: install the chamfering knife 5 on the end of the cantilever end of the second rod body 2 in a positive direction, so that the conical cutting part of the chamfering knife 5 is set in the direction away from the first rod body 1; the conical cutting part of the chamfering knife 5 is placed against the hole on the front side of the first hanging ring 103a, hold the bearing 4 with one hand, and hold the cross bar of the U-shaped rod 3 with the other hand to rotate, driving the chamfering knife 5 to rotate for chamfering. The specific operating principle is as follows: Figure 6 shown.

[0048] S2. Chamfer the hole on the back side of the first hanging ring 103a: remove the chamfering knife 5 from the second rod body 2, pass the second rod body 2 through the through hole of the first hanging ring 103a, and then reversely install the chamfering knife 5 on the end of the cantilever end of the second rod body 2, so that the conical cutting part on the chamfering knife 5 is set in the direction of the first rod body 1, and the conical cutting part on the chamfering knife 5 is placed against the hole on the back side of the first hanging ring 103a. Hold the bearing 4 with one hand and hold the crossbar of the U-shaped rod 3 with the other hand to rotate, driving the chamfering knife 5 to rotate for chamfering. The specific operating principle is as follows: Figure 7 shown.

[0049] S3. Chamfer the hole on the front side of the second hanging ring 103b: remove the chamfering knife 5 from the second rod body 2, pass the second rod body 2 through the through hole of the first hanging ring 103a, and then install the chamfering knife 5 on the end of the cantilever end of the second rod body 2 in a positive direction, so that the conical cutting part on the chamfering knife 5 is set in a direction away from the first rod body 1, and the conical cutting part on the chamfering knife 5 is placed against the hole on the front side of the second hanging ring 103b. Hold the bearing 4 with one hand and hold the crossbar of the U-shaped rod 3 with the other hand to rotate, driving the chamfering knife 5 to rotate for chamfering. The specific operating principle is as follows: Figure 8 shown.

[0050] S4. Chamfer the hole on the back side of the second hanging ring 103b: remove the chamfering knife 5 from the second rod body 2, pass the second rod body 2 through the through holes of the first hanging ring 103a and the second hanging ring 103b, and then reversely install the chamfering knife 5 on the end of the cantilever end of the second rod body 2, so that the conical cutting part on the chamfering knife 5 is set in the direction of the first rod body 1, and the conical cutting part on the chamfering knife 5 is placed against the hole on the back side of the second hanging ring 103b. Hold the bearing 4 with one hand and hold the crossbar of the U-shaped rod 3 with the other hand to rotate, driving the chamfering knife 5 to rotate for chamfering. The specific operating principle is as follows: Fig. 9 shown.

[0051] In the steps S1 to S4, an axial force is applied while holding the bearing 4, so that the conical cutting portion of the chamfering cutter 5 is closely against the hole to be chamfered.

[0052] In the steps S1 to S4, when chamfering, the axis of the second rod body 2 is always kept coincident with the axis of the through hole to be chamfered, so as to avoid inclination of the chamfering angle.

[0053] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A tool for chamfering the front and back surfaces of through holes in double-layer narrow groove spaces, characterized in that: The invention comprises a first rod body (1), a second rod body (2) and a U-shaped rod (3); the axes of the first rod body (1) and the second rod body (2) are colinear and are arranged at an interval; the first rod body (1) and the second rod body (2) are connected via the U-shaped rod (3); a bearing (4) is installed at the end of the cantilever end of the first rod body (1); a chamfering cutter (5) is installed at the end of the cantilever end of the second rod body (2) via a detachable connection; and the diameter of the second rod body (2) is smaller than the diameter of the through hole to be chamfered on the hanging ring (103).

2. A tool for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space as claimed in claim 1, characterized in that: A threaded section (2a) is provided on the end of the cantilever end of the second rod body (2), and an outer cylindrical surface of the threaded section (2a) is provided with an external thread; a threaded hole (5a) is provided at the center of the chamfering cutter (5); and the chamfering cutter (5) is connected to the threaded section (2a) on the end of the second rod body (2) via the threaded hole (5a).

3. A tool for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space as claimed in claim 2, characterized in that: The length of the threaded section (2a) is not less than 20 mm.

4. A tool for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space as claimed in claim 1, characterized in that: A rotating sleeve (6) is sleeved on the cross bar of the U-shaped rod (3); the inner hole of the rotating sleeve (6) is clearance-matched with the cross bar of the U-shaped rod (3).

5. A tool for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space as claimed in claim 1, characterized in that: The first rod body (1), the second rod body (2) and the U-shaped rod (3) are formed by bending the same rod body.

6. A tool for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space as claimed in claim 1, characterized in that: The distance between the two side bars of the U-shaped bar (3) is t, which satisfies: 120 mm ≤ t ≤ 200 mm.

7. A method for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space, characterized in that: The tool for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space according to any one of claims 1 to 6 comprises the following steps: S1. Chamfering the hole on the front side of the first hanging ring (103a): positively mounting the chamfering knife (5) on the end of the cantilever end of the second rod body (2), so that the conical cutting portion on the chamfering knife (5) is arranged in a direction away from the first rod body (1); placing the conical cutting portion on the chamfering knife (5) against the hole on the front side of the first hanging ring (103a), holding the bearing (4) with one hand and holding the cross bar of the U-shaped rod (3) with the other hand to rotate, thereby driving the chamfering knife (5) to rotate for chamfering; S2. Chamfering the hole on the back side of the first hanging ring (103a): remove the chamfering knife (5) from the second rod body (2), pass the second rod body (2) through the through hole of the first hanging ring (103a), and then reversely install the chamfering knife (5) on the end of the cantilever end of the second rod body (2), so that the conical cutting part of the chamfering knife (5) is set in the direction of the first rod body (1), and the conical cutting part of the chamfering knife (5) is placed against the hole on the back side of the first hanging ring (103a), hold the bearing (4) with one hand, and hold the cross bar of the U-shaped rod (3) with the other hand to rotate, thereby driving the chamfering knife (5) to rotate for chamfering; S3, chamfering the hole on the front side of the second hanging ring (103b): remove the chamfering knife (5) from the second rod body (2), pass the second rod body (2) through the through hole of the first hanging ring (103a), and then install the chamfering knife (5) on the end of the cantilever end of the second rod body (2) in a positive direction, so that the conical cutting part of the chamfering knife (5) is arranged in a direction away from the first rod body (1), and the conical cutting part of the chamfering knife (5) is pressed against the hole on the front side of the second hanging ring (103b), hold the bearing (4) with one hand, and hold the cross bar of the U-shaped rod (3) with the other hand to rotate, thereby driving the chamfering knife (5) to rotate for chamfering; S4. Chamfer the hole on the back side of the second hanging ring (103b): remove the chamfering knife (5) from the second rod body (2), pass the second rod body (2) through the through holes of the first hanging ring (103a) and the second hanging ring (103b), and then reversely install the chamfering knife (5) on the end of the cantilever end of the second rod body (2), so that the conical cutting part of the chamfering knife (5) is set in the direction of the first rod body (1), and the conical cutting part of the chamfering knife (5) is placed against the hole on the back side of the second hanging ring (103b), hold the bearing (4) with one hand, and hold the cross bar of the U-shaped rod (3) with the other hand to rotate, thereby driving the chamfering knife (5) to rotate for chamfering.

8. A method for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space as claimed in claim 7, characterized in that: In the steps S1 to S4, an axial force is applied while holding the bearing (4), so that the conical cutting portion on the chamfering cutter (5) is closely attached to the hole to be chamfered.

9. A method for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space as claimed in claim 7, characterized in that: In the steps S1 to S4, when chamfering is performed, the axis of the second rod body (2) is always kept coincident with the axis of the through hole to be chamfered.

10. A method for chamfering the front and back surfaces of a through hole in a double-layer narrow groove space as claimed in claim 7, characterized in that: Before the chamfering operation is performed, the distance between the hanging ring (103) and the end faces of both ends of the force cylinder (100) is determined, and the chamfering operation is performed at the end of the hanging ring (103) that is closest to the end face.

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