Fixing clamp for special-shaped slender fuel nozzle rod nozzle and machining method of special-shaped slender fuel nozzle rod nozzle

Abstract

The invention discloses a fixing clamp and a machining method for a special-shaped slender fuel nozzle rod nozzle. The fixing clamp comprises a supporting base, a horizontal clamping assembly and a vertical clamping assembly, the horizontal clamping assembly and the vertical clamping assembly are arranged on the supporting base, and the clamping assemblies limit deviation of a workpiece and improve the rigidity of a nozzle rod; the machining method comprises the steps that S1, double-meter alignment is carried out; s2, a drill bit with the diameter phi of 7.5 mm is selected for drilling and milling an inner hole, allowance is reserved at the bottom, and after machining is completed, scrap iron in a nozzle is blown away through a high-pressure air gun; s3, a drill bit with the diameter phi of 2.3 mm is selected for machining a nozzle outlet hole in the bottom of the nozzle; s4, a drill bit with the diameter phi of 7.5 mm is selected to remove the bottom allowance; s5, a 110-degree conical surface and the inner wall of the nozzle are machined through a 110-degree forming reamer; according to the technical scheme, the size machining precision problem of the nozzle of the special-shaped long and thin fuel nozzle rod is effectively solved, and the product yield is increased.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a fixing fixture and a processing method for a nozzle of a special-shaped and elongated fuel nozzle rod. Background Art

[0002] As attached Figure 1 The fuel nozzle rod structure of a certain aircraft engine is shown. The fuel nozzle rod of this structure is a slender special-shaped structure. The rigidity is poor during processing and it is easy to deform and scrap. In terms of materials, the nozzle rod is made of high-temperature alloy, which is difficult to process. When processing the outer circle of the nozzle part of the nozzle rod, it is necessary to ensure that the installation outer circle has a good position. However, the overhang length of this part is long and the rigidity is poor. The position requirement is difficult to meet the requirements. It is necessary to add an auxiliary support device, use a push rod to support the left and right directions of the nozzle rod, and limit the movement of the nozzle in the left and right directions by pushing. The movement of the nozzle in the up and down directions is limited by the push rod and the pressure plate. However, when tightening the push rod to limit the movement of the parts in the up, down, left and right directions, the parts are offset due to uneven force on the push rod, resulting in the position of this part cannot meet the requirements of the design drawings.

[0003] At the same time processing such as Figure 2 When the fuel nozzle rod nozzle outlet hole size is shown, the traditional processing scheme is as shown in the attached Figure 3 As shown: first use a Φ7.5 alloy drill to remove the excess, then use a 110° forming reamer to process the 110° conical surface and the inner wall of the nozzle, and finally process the bottom nozzle outlet hole. This solution is inconvenient for chip removal when using a forming reamer, and the conical surface and the wall surface are processed at the same time, the cutting force is large, and after the reamer processing, the iron chips are deposited at the bottom and cannot be discharged, so the bottom with a thinner wall thickness is squeezed and deformed, resulting in dimensional deviation.

[0004] Publication No. CN105458626A discloses a processing control method for aircraft engine fuel nozzle parts, which uses a turning and milling composite CNC machine tool to clamp the material rod once and perform all the processing steps; the reverse boring processing technology is used to facilitate chip removal, reduce the tearing and scratching of the injection hole by iron chips, and ensure that the flow test performance parameters of the nozzle are qualified. However, this patented technical solution is only applicable to the processing of conventional nozzle parts and cannot meet the processing requirements of special-shaped and large-sized nozzle parts. Summary of the invention

[0005] The present invention provides a fixing fixture and a processing method for a special-shaped and elongated fuel nozzle rod nozzle in order to solve the processing difficulties such as the size is easy to exceed the tolerance and the position is difficult to ensure during the processing of the fuel nozzle rod nozzle.

[0006] The purpose of the present invention is achieved through the following technical solutions:

[0007] A fixing fixture for a special-shaped and elongated fuel nozzle rod nozzle, comprising a supporting base, a horizontal clamping assembly and a vertical clamping assembly arranged on the supporting base; the horizontal clamping assembly limits the horizontal deviation of the fuel nozzle rod nozzle, and comprises a first horizontal clamping piece and a second horizontal clamping piece arranged opposite to each other; the vertical clamping assembly limits the upward and downward deviation of the fuel nozzle rod nozzle, and comprises a supporting block and a pressing plate, and the supporting block and the pressing plate are mounted on the supporting base through nuts.

[0008] Furthermore, the first horizontal clamping member includes a first clamping head movably mounted on the support base, a first adjusting nut is arranged behind the first clamping head, and the first adjusting nut is installed on the support base through a threaded hole arranged on the support base; the second horizontal clamping member includes a second clamping head movably mounted on the support base, a second adjusting nut is arranged behind the second clamping head, and the second adjusting nut is installed on the support base through a threaded hole arranged on the support base.

[0009] Furthermore, the support base is fixed to the working table of the lathe by means of a pressing plate or T-bolts.

[0010] A method for processing a special-shaped elongated fuel nozzle rod nozzle, wherein the special-shaped elongated fuel nozzle rod nozzle is made of a high-temperature alloy material and is connected to a nozzle rod, and the angle between the nozzle rod and the central axis of the nozzle is greater than 90°; a plurality of coaxial circular cavities with different radii are arranged inside the nozzle, a nozzle outlet hole is provided at the bottom of the nozzle, and a tapered transition is provided between the nozzle outlet hole and the circular cavity, and the processing method comprises the following steps:

[0011] S1. Alignment with double-hit gauge: Fix the nozzle rod to the fixing fixture, hit gauge 1 on either side of the nozzle rod, and gauge 2 on the upper surface of the nozzle rod. After zeroing, first tighten the adjusting nut of the horizontal clamping assembly and the supporting block and pressure plate of the vertical clamping assembly, and then fine-tune the adjusting nut, supporting block and pressure plate so that the gauge pointer still points to the zeroing position.

[0012] S2. Use a Φ7.5mm drill bit to drill and mill the inner hole and leave a margin at the bottom. After processing, use a high-pressure air gun to blow away the iron chips in the nozzle;

[0013] S3, use a Φ2.3mm drill bit to process the nozzle outlet hole at the bottom of the nozzle;

[0014] S4, use a Φ7.5mm drill bit to remove the bottom excess;

[0015] S5. Use a 110° forming reamer to process the 110° cone surface and the inner wall of the nozzle;

[0016] Furthermore, the bottom margin is 2 to 3 mm;

[0017] Furthermore, the rotation speed of the Φ7.5 mm drill in S2 is 1000 r / min, the cutting depth is 2 mm, and the feed is 40 mm / min.

[0018] Furthermore, the rotation speed of the Φ2.3 mm drill in S3 is 1500 r / min, the cutting depth is 1 mm, and the feed is 35 mm / min.

[0019] Furthermore, the rotation speed of the Φ7.5 mm drill in S4 is 1000 r / min, the cutting depth is 1 mm, and the feed is 30 mm / min.

[0020] Furthermore, the rotation speed of the 110° forming reamer is 1000 r / min, the cutting depth is 1 mm, and the feed is 30 mm / min.

[0021] Furthermore, the drill bit and the forming reamer are both made of cemented carbide.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The fixing fixture designed in the present invention limits the horizontal deviation of the nozzle of the fuel nozzle rod by setting a horizontal clamping assembly, and limits the vertical deviation of the nozzle of the fuel nozzle rod by setting a vertical clamping assembly, thereby improving the rigidity of the special-shaped and slender nozzle rod and avoiding processing deformation due to cutting force;

[0024] 2) The double-dip gauge alignment method proposed in the present invention uses a double-dip gauge clamping method to simultaneously press the gauge on the upper surface and side of the nozzle, and then adjust the gauge to zero in a natural state. After zeroing, first tighten the adjustment nut of the horizontal clamping assembly and the support block and pressure plate of the vertical clamping assembly, and then fine-tune the adjustment nut, support block, and pressure plate so that the gauge pointer still points to the zeroing position, ensuring that the position of the nozzle rod after pressing is consistent with the position in the natural state, eliminating the deformation of parts caused by uneven support force;

[0025] 3) The present invention effectively avoids the extrusion deformation of the thin wall surface caused by the inconvenience of chip removal by designing the processing sequence of the inner wall of the nozzle rod nozzle, thereby improving the yield rate of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A schematic diagram of the structure of the special-shaped and elongated fuel nozzle rod processed by the present invention;

[0027] Figure 2 It is a schematic diagram of a special-shaped and elongated fuel nozzle rod nozzle;

[0028] Figure 3 A schematic diagram of a tool path for machining a fuel nozzle rod nozzle;

[0029] Figure 4This is a schematic diagram of the tool path for fuel nozzle rod nozzle processing in this scheme;

[0030] Figure 5 It is a front view of a fixing fixture structure of a special-shaped and elongated fuel nozzle rod nozzle;

[0031] Figure 6 It is a side view of a fixing fixture structure of a special-shaped and elongated fuel nozzle rod nozzle;

[0032] Figure 7 A top view of a fixing fixture structure for a special-shaped and elongated fuel nozzle rod nozzle;

[0033] Figure 8 A method for processing a special-shaped and elongated fuel nozzle rod nozzle;

[0034] Among them: 1. support base; 2. support block; 3. pressure plate; 4. nozzle; 5. first clamping head; 6. first adjusting nut; 7. second clamping head; 8. second adjusting nut; 9. pressure plate nut. DETAILED DESCRIPTION

[0035] In order to clearly illustrate the technical features of this solution, the present invention is described in detail below through specific implementation methods and in combination with the accompanying drawings. In the following description, many specific details are described to facilitate a full understanding of the present application, but the present application can also be implemented in other ways different from those described herein, so the protection scope of the present application is not limited by the specific embodiments disclosed below. In addition, in the description of the present application, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc. is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application 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 a limitation on the present application. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly specified and specifically defined. In this application, unless otherwise clearly specified and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral body; it can be a mechanical connection, an electrical connection, or a communication; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In this application, unless otherwise clearly specified and defined, the first feature "on" or "under" the second feature can be the first and second features directly contacting, or the first and second features indirectly contacting through an intermediate medium. In the description of this specification, the description of the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of this application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0036] Example 1

[0037] See also Figure 1 , Figure 2 , Figure 5 , Figure 6 and Figure 7 The present invention provides an embodiment: a fixing fixture for a special-shaped and elongated fuel nozzle rod nozzle, comprising a support base 1, a horizontal clamping assembly and a vertical clamping assembly arranged on the support base 1; the horizontal clamping assembly limits the horizontal deviation of the fuel nozzle rod nozzle, and comprises a first horizontal clamping member and a second horizontal clamping member arranged opposite to each other; the vertical clamping assembly limits the upward and downward deviation of the fuel nozzle rod nozzle, and comprises a support block 2 and a pressure plate 3, the support block 2 is fixed to the support base 1 by threads and can be adjusted up and down; the pressure plate 3 is installed on the support base 1 by a pressure plate nut 9.

[0038] The fixing fixture of the special-shaped slender fuel nozzle rod nozzle, the first horizontal clamping piece includes a first clamping head 5 movably mounted on the support base 1, a first adjusting nut 6 is arranged behind the first clamping head 5, and the first adjusting nut 6 is installed on the support base 1 through a threaded hole set in the support base 1; the second horizontal clamping piece includes a second clamping head 7 movably mounted on the support base 1, a second adjusting nut 8 is arranged behind the second clamping head 7, and the second adjusting nut 8 is installed on the support base 1 through a threaded hole set in the support base 1.

[0039] The support base 1 is fixed on the working table of the lathe through a pressing plate.

[0040] The nozzle rod is fixed to the fixing fixture, and at the same time, the movement of the nozzle rod in the up and down directions is limited by adjusting the support block 2 and the pressure plate nut 9 for the slender rod extending out of the fixture support surface with poor rigidity, and the movement of the nozzle rod in the left and right directions is limited by the first adjusting nut 6 and the second adjusting nut 8.

[0041] Example 2

[0042] See also Figures 1 to 7 An embodiment provided by the present invention:

[0043] A method for processing a special-shaped elongated fuel nozzle rod nozzle, wherein the special-shaped elongated fuel nozzle rod nozzle is made of a high-temperature alloy material and is connected to a nozzle rod, and the angle between the nozzle rod and the central axis of the nozzle is greater than 90°; a plurality of coaxial circular cavities with different radii are arranged inside the nozzle, a nozzle outlet hole is provided at the bottom of the nozzle, and a tapered transition is provided between the nozzle outlet hole and the circular cavity, and the processing method comprises the following steps:

[0044] S1. Alignment by double-hitting the gauge: fix the nozzle rod to the fixing fixture (see Example 1 for the fixture), place the gauge head 1 on the side of the nozzle rod nozzle in a natural state and adjust the gauge to zero, place the gauge head 2 above the nozzle rod nozzle and adjust the gauge to zero, and then tighten the first adjustment nut 6 and the second adjustment nut 8 as well as the adjustment support block 2 and the pressure plate nut 9. When the nozzle rod is first top-to-top to limit the displacement in the left and right directions, it is found that the gauge head hit on the upper surface of the nozzle rod will also change, indicating that the vertical direction will also be offset when the nozzle is fixed in the left and right directions. When the nozzle rod is first top-to-top to limit the displacement in the vertical direction, it is found that the gauge head hit on the side of the nozzle rod will also change, indicating that the left and right direction will also be offset when the nozzle is fixed in the vertical direction. To this end, the deformation of the nozzle rod can be recorded by hitting the gauge in a natural state, and finally the support device of the fixture can be fine-tuned according to the deformation recorded by the gauge head until the two gauge head pointers are pointed back to the 0 position, ensuring that the position of the nozzle rod after clamping is consistent with the position in the natural state;

[0045] S2. Use a Φ7.5mm drill bit to drill and mill the inner hole and leave a margin at the bottom. After processing, use a high-pressure air gun to blow away the iron chips in the nozzle;

[0046] S3, use a Φ2.3mm drill bit to process the nozzle outlet hole at the bottom of the nozzle;

[0047] S4, use a Φ7.5mm drill bit to remove the bottom excess;

[0048] S5. Use a 110° forming reamer to process the 110° cone surface and the inner wall of the nozzle;

[0049] The bottom margin is 2 mm, and the drill bit and forming reamer are both made of cemented carbide.

[0050] Example 3

[0051] See also Figures 1 to 7 An embodiment provided by the present invention:

[0052] A method for processing a special-shaped elongated fuel nozzle rod nozzle, wherein the special-shaped elongated fuel nozzle rod nozzle is made of a high-temperature alloy material and is connected to a nozzle rod, and the angle between the nozzle rod and the central axis of the nozzle is greater than 90°; a plurality of coaxial circular cavities with different radii are arranged inside the nozzle, a nozzle outlet hole is provided at the bottom of the nozzle, and a tapered transition is provided between the nozzle outlet hole and the circular cavity, and the processing method comprises the following steps:

[0053] S1. Alignment by double-hitting the gauge: fix the nozzle rod to the fixing fixture (see Example 1 for the fixture), place the gauge head 1 on the side of the nozzle rod nozzle in a natural state and adjust the gauge to zero, place the gauge head 2 above the nozzle rod nozzle and adjust the gauge to zero, and then tighten the first adjustment nut 6 and the second adjustment nut 8 as well as the adjustment support block 2 and the pressure plate nut 9. When the nozzle rod is first top-to-top to limit the displacement in the left and right directions, it is found that the gauge head hit on the upper surface of the nozzle rod will also change, indicating that the vertical direction will also be offset when the nozzle is fixed in the left and right directions. When the nozzle rod is first top-to-top to limit the displacement in the vertical direction, it is found that the gauge head hit on the side of the nozzle rod will also change, indicating that the left and right direction will also be offset when the nozzle is fixed in the vertical direction. To this end, the deformation of the nozzle rod can be recorded by hitting the gauge in a natural state, and finally the support device of the fixture can be fine-tuned according to the deformation recorded by the gauge head until the two gauge head pointers are pointed back to the 0 position, ensuring that the position of the nozzle rod after clamping is consistent with the position in the natural state;

[0054] S2. Use a Φ7.5mm drill bit to drill and mill the inner hole and leave a margin at the bottom. After processing, use a high-pressure air gun to blow away the iron chips in the nozzle;

[0055] S3, use a Φ2.3mm drill bit to process the nozzle outlet hole at the bottom of the nozzle;

[0056] S4, use a Φ7.5mm drill bit to remove the bottom excess;

[0057] S5. Use a 110° forming reamer to process the 110° cone surface and the inner wall of the nozzle;

[0058] The bottom margin is 3 mm, and the drill bit and forming reamer are both made of cemented carbide.

[0059] In this embodiment, the processing parameters in Example 2 are specified:

[0060] The rotation speed of the Φ7.5mm drill in S2 is 1000r / min, the cutting depth is 2mm, and the feed is 40mm / min.

[0061] The rotation speed of the Φ2.3 mm drill in S3 is 1500 r / min, the cutting depth is 1 mm, and the feed is 35 mm / min.

[0062] The rotation speed of the Φ7.5mm drill in S4 is 1000r / min, the cutting depth is 1mm, and the feed is 30mm / min.

[0063] The rotation speed of the 110° forming reamer is 1000 r / min, the cutting depth is 1 mm, and the feed is 30 mm / min.

[0064] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A fixing fixture for a special-shaped and elongated fuel nozzle rod nozzle, characterized in that: It includes a support base, a horizontal clamping assembly and a vertical clamping assembly arranged on the support base; the horizontal clamping assembly limits the horizontal deviation of the nozzle of the fuel nozzle rod, and includes a first horizontal clamping member and a second horizontal clamping member arranged opposite to each other; the vertical clamping assembly limits the upward and downward deviation of the nozzle of the fuel nozzle rod, and includes a support block and a pressure plate, and the support block and the pressure plate are installed on the support base through nuts.

2. A fixing fixture for a special-shaped and elongated fuel nozzle rod nozzle according to claim 1, characterized in that: The first horizontal clamping member includes a first clamping head movably mounted on the support base, a first adjusting nut is arranged behind the first clamping head, and the first adjusting nut is installed on the support base through a threaded hole arranged on the support base; the second horizontal clamping member includes a second clamping head movably mounted on the support base, a second adjusting nut is arranged behind the second clamping head, and the second adjusting nut is installed on the support base through a threaded hole arranged on the support base.

3. A fixing fixture for a special-shaped elongated fuel nozzle rod nozzle according to claim 1, characterized in that: The support base is fixed on the working table of the lathe through a pressing plate or T-bolts.

4. A method for processing a special-shaped elongated fuel nozzle rod nozzle, characterized in that: The processing method comprises the following steps: S1. Alignment with double-hit gauge: Fix the nozzle rod to the fixing fixture, hit gauge 1 on either side of the nozzle rod, and gauge 2 on the upper surface of the nozzle rod. After zeroing, first tighten the adjusting nut of the horizontal clamping assembly and the supporting block and pressure plate of the vertical clamping assembly, and then fine-tune the adjusting nut, supporting block and pressure plate so that the gauge pointer still points to the zeroing position. S2. Use a Φ7.5mm drill bit to drill and mill the inner hole and leave a margin at the bottom. After processing, use a high-pressure air gun to blow away the iron chips in the nozzle; S3, use a Φ2.3mm drill bit to process the nozzle outlet hole at the bottom of the nozzle; S4, use a Φ7.5mm drill bit to remove the bottom excess; S5. Use a 110° forming reamer to process the 110° cone surface and the inner wall of the nozzle.

5. A method for processing a special-shaped elongated fuel nozzle rod nozzle according to claim 4, characterized in that: The bottom margin is 2 to 3 mm.

6. The method for processing a special-shaped elongated fuel nozzle rod nozzle according to claim 4, characterized in that: The rotation speed of the Φ7.5mm drill in S2 is 1000r / min, the cutting depth is 2mm, and the feed is 40mm / min.

7. The method for processing a special-shaped elongated fuel nozzle rod nozzle according to claim 4, characterized in that: The rotation speed of the Φ2.3 mm drill in S3 is 1500 r / min, the cutting depth is 1 mm, and the feed is 35 mm / min.

8. The method for processing a special-shaped elongated fuel nozzle rod nozzle according to claim 4, characterized in that: The rotation speed of the Φ7.5mm drill in S4 is 1000r / min, the cutting depth is 1mm, and the feed is 30mm / min.

9. The method for processing a special-shaped elongated fuel nozzle rod nozzle according to claim 4, characterized in that: The rotation speed of the 110° forming reamer is 1000 r / min, the cutting depth is 1 mm, and the feed is 30 mm / min.

10. The method for processing a special-shaped elongated fuel nozzle rod nozzle according to claim 4, characterized in that: The drill bit and the forming reamer are both made of hard alloy.

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