A device and method for machining holes on the circumference of an intake duct connecting flange

Abstract

The present invention belongs to the field of mechanical processing technology, and relates to a device and method for processing holes on the circumference of an intake duct connecting flange; it includes a base, a stepped drill sleeve, a stepped fixing pin, a drilling jig, a copper bushing, a positioning block, a rotating shaft, a fixing plate, a fixing bolt, a positioning bolt, and a reticulated handle; through a clever structural assembly design, the circumferential holes of the product can be processed by a bench drill instead of a five-axis CNC machine tool, and at the same time, the dimensional accuracy, relative position, and relative angle of the processed holes on the circumference of the connecting flange are qualified, and the quality is stable, which greatly shortens the time for part clamping, alignment, programming, and processing, greatly improves the efficiency of part processing, and saves processing costs. The fixture device has a simple structure and is easy to operate, realizes the reasonable and reliable positioning and clamping of parts, reduces the difficulty of workers' operation, and can meet the requirements of mass production.

Description

Technical Field

[0001] The present invention belongs to mechanical processing technology and relates to a device and method for processing holes on the circumference of an intake duct connecting flange. Background Art

[0002] In the assembly of helicopter structures, connecting flanges are widely used. The connecting flanges are made of 0Cr18Ni9 stainless steel (forgings). They are thin-walled stainless steel parts and are important exhaust components of the air intake. Their maximum dimensions are φ354.8mm×25.5mm. The structure is as follows: Figure 1 As shown. On the circumference of the connecting flange, there are two rows of vent holes φ20 +0.1 mm, a total of 24 places; there is a row of rivet holes φ2mm in the middle of the two rows of ventilation holes, a total of 17 places.

[0003] The traditional processing method for the holes on the circumference of the connecting flange is to use a five-axis machine tool to perform CNC programming drilling according to the digital model. Although this method can ensure the accuracy, relative position and relative angle of the holes on the circumference of the product, it is difficult to clamp the product, the processing is difficult, the processing time is long, the processing efficiency is low, and the processing cost is high. Summary of the Invention

[0004] The purpose of the present invention is to provide a device and method for processing holes on the circumference of a connecting flange, replacing the drilling processing of a five-axis machine tool CNC programming with the drilling processing of a bench drill, thereby solving the problems of difficult clamping, high processing difficulty and low processing efficiency, while ensuring the dimensional accuracy, relative position and relative angle of the holes on the circumference of the product.

[0005] Technical solution: On the one hand, the present invention proposes a device for processing holes on the circumference of the air intake duct connecting flange, including a base, a step drill sleeve, a step fixing pin, a drill jig, a copper bushing, a positioning block, a rotating shaft, a fixing pad, a fixing bolt, a positioning bolt, and a mesh handle; the step drill sleeve is installed in the step hole of the upper plate of the base through interference fit; the rotating shaft is installed and fixed in the rotating shaft mounting hole of the vertical plate of the base through a nut and a washer; the copper bushing is installed in the bushing mounting hole at the center of the drill jig through interference fit; the positioning block is installed and fixed in the positioning groove of the drill jig through a cross slot countersunk screw; the drill jig is installed as a whole on the rotating shaft through the interference fit of the copper bushing; the connecting flange is installed on the step outer circle of the drill jig through the positioning block; the fixing pad presses the connecting flange to the bottom surface of the step through the fixing bolt and the threaded hole a; the positioning bolt is installed in the threaded hole b on the drill jig; the mesh handle is installed on the rotating shaft through threaded fit, and the upper plate of the base is provided with a step hole for interference installation of the step drill sleeve; its upper plate is provided with a pin hole for positioning the step fixing pin.

[0006] The base bottom plate is provided with a U-shaped groove for being installed and fixed on the working table of the drilling machine through bolts and washers.

[0007] The base vertical plate is provided with a groove plane for positioning bolts to tighten and limit; a shaft mounting hole is provided at the center of the vertical plate for mounting the shaft.

[0008] The step drill sleeve is made of tool steel and has a drill sleeve through hole at its axis.

[0009] The circumference of the drilling template is provided with three rows of 41 positioning holes in total, which have the same relative positions and relative angles as the holes on the circumference of the connecting flange.

[0010] The drilling jig is provided with a stepped outer circle, and a positioning groove is provided on the circumference of the stepped outer circle for installing a positioning block; the connecting flange is installed on the stepped outer circle of the drilling jig through the positioning block and fits with the bottom surface of the step; a circle of chip removal ring groove is provided on the circumference of the stepped outer circle for removing chips when the connecting flange processes the circumferential holes; seventeen arc-shaped notches are provided on the circumference of the stepped outer circle for preventing burrs on the circumferential holes of the connecting flange from scratching parts and tooling when the connecting flange is removed after processing.

[0011] The hole spacing between the positioning holes on the circumference of the drilling template and the corresponding holes on the circumference after the connecting flange is positioned and installed is the same as the hole spacing between the pin holes and the through holes of the drill sleeve.

[0012] A bushing mounting hole is provided at the center of the drilling jig for interference mounting of a copper bushing.

[0013] The end face of the drilling template is provided with four circumferentially evenly distributed threaded holes a and four circumferentially evenly distributed threaded holes b.

[0014] The fixing pad is provided with four large-head waist-shaped annular grooves, and the large-head ends are used to keep away the bolt heads of the fixing bolts during installation.

[0015] The fixing pad is provided with a lightening hole for lightening and avoiding the positioning bolt and the mesh handle.

[0016] The processing method of machining holes on the circumference of the connecting flange using the above-mentioned fixture device is as follows:

[0017] Step 1: Fix the processing device to the work surface of the drilling machine through the U-shaped groove on the bottom plate of the base with bolts and washers, and align the drill sleeve through hole at the axis center of the stepped drill sleeve;

[0018] Step 2: Install the connecting flange on the outer circle of the step of the drilling jig through the positioning block, ensuring that the holes on its circumference are in the same direction as the corresponding positioning holes on the circumference of the drilling jig, and tighten it to the bottom surface of the step with a fixing plate and four fixing bolts;

[0019] Step 3: Insert the step fixing pins through the pin holes of the upper plate of the base into the first row of starting positioning holes on the circumference of the drilling jig. Screw the four positioning bolts into the threaded holes b on the drilling jig, tighten them against the upper limit position on the groove plane of the base vertical plate, and secure the drilling jig with the mesh handle.

[0020] Step 4: The fitter uses a drilling machine to insert the drill bit through the drill sleeve through hole at the axis of the stepped drill sleeve to machine the hole on the circumference of the connecting flange;

[0021] Step 5: Loosen the mesh handle, turn the jig by hand, insert the step fixing pin into the next positioning hole in the first row on the circumference of the jig, and repeat steps 2, 3, 4, and 5 until the first row of holes is machined;

[0022] Step 6: The processing steps and principles for the second row of holes and the third hole are the same as those for the first row of holes. Repeat steps 2, 3, 4, and 5 until the second row of holes and the third hole are processed.

[0023] Beneficial Technical Effects: Using the processing device and method described in this invention, the circumferential holes of a product can be drilled on a bench drill instead of using a five-axis CNC machine tool for drilling. The resulting circumferential holes of the connecting flange meet the required dimensional accuracy, relative position, and relative angle, ensuring stable quality. This significantly reduces the time required for part clamping, alignment, programming, and machining, significantly improving part machining efficiency and saving machining costs. The fixture device has a simple structure and is easy to operate, enabling reasonable and reliable positioning and clamping of parts, reducing operator complexity and meeting mass production requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the connecting flange structure;

[0025] Figure 2 For connecting flange processing device;

[0026] Figure 3 This is a schematic diagram of the clamping of the processing device and the connecting flange of the present invention;

[0027] Figure 4 Schematic diagram of the base structure;

[0028] Figure 5 Schematic diagram of the step drill sleeve structure;

[0029] Figure 6 Schematic diagram of the step fixing pin structure;

[0030] Figure 7 Schematic diagram of the drilling template structure;

[0031] Figure 8 Schematic diagram of the copper bushing structure;

[0032] Figure 9 It is a schematic diagram of the positioning block structure;

[0033] Figure 10 Schematic diagram of the shaft structure;

[0034] Figure 11Schematic diagram of the fixed pad structure;

[0035] Figure 12 Schematic diagram of the fixing bolt structure;

[0036] Figure 13 It is a schematic diagram of the positioning bolt structure;

[0037] Figure 14 Schematic diagram of the handle structure;

[0038] Among them, 1-base, 2-step drill sleeve, 3-step fixing pin, 4-drilling jig, 5-copper bushing, 6-positioning block, 7-rotating shaft, 8-fixing pad, 9-fixing bolt, 10-positioning bolt, 11-reticulated handle, 12-connecting flange, 13-U-shaped groove, 14-step hole, 15-pin hole, 16-rotating shaft mounting hole, 17-groove plane, 18-drill sleeve through hole, 19-positioning hole, 20-step outer circle, 21-step bottom surface, 22-positioning groove, 23-chip removal ring groove, 24-arc-shaped notch, 25-bushing mounting hole, 26-threaded hole a, 27-threaded hole b, 28-large head end waist-shaped ring groove, 29-lightening hole. DETAILED DESCRIPTION

[0039] The following is a clear and complete description of the technical solution of the present invention in conjunction with the accompanying drawings. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0040] See attached Figure 2-14 ,in, Figure 1 The invention specifically designs a device for processing holes on the circumference of an intake duct connection flange, which includes a base 1, a step drill sleeve 2, a step fixing pin 3, a drilling jig 4, a copper bushing 5, a positioning block 6, a rotating shaft 7, a fixing pad 8, a fixing bolt 9, a positioning bolt 10, and a reticulated handle 11; the step drill sleeve 2 is installed in the step hole 14 on the upper plate of the base 1 through an interference fit; the rotating shaft 7 is installed and fixed in the rotating shaft mounting hole 16 of the vertical plate of the base 1 through a nut and a washer; the copper bushing 5 is installed in the bushing mounting hole at the center of the drilling jig 4 through an interference fit The jig 4 is mounted on the rotating shaft 7 through the copper bushing 5 with an interference fit; the connecting flange 12 is mounted on the stepped outer circle 20 of the jig 4 through the positioning block 6; the fixing plate 8 presses the connecting flange 12 on the step bottom surface 21 through the fixing bolt 9 and the threaded hole a26; the positioning bolt 10 is installed in the threaded hole b27 on the jig 4; the textured handle 11 is mounted on the rotating shaft 7 through a threaded fit.

[0041] The base 1 is provided with three U-shaped grooves 13 on the bottom plate, which are used for being fixed on the working surface of the drilling machine through bolts and washers.

[0042] The vertical plate of the base 1 is provided with a groove plane 17 for tightening and limiting the positioning bolt 10; a shaft mounting hole 16 is provided at the center of the vertical plate for mounting the shaft 7.

[0043] The upper plate of the base 1 is provided with a step hole 14 for interference installation of the step drill sleeve 2; the upper plate is provided with a pin hole 15 for positioning the step fixing pin 3.

[0044] The stepped drill sleeve 2 is made of tool steel and has a drill sleeve through hole 18 at its axis.

[0045] The drilling jig 4 is provided with three rows of 41 positioning holes 19 on its circumference, which are in the same relative position and angle as the holes on the circumference of the connecting flange 12 .

[0046] The drilling jig 4 is provided with a stepped outer circle 20, and a positioning groove 22 is provided on the circumference of the stepped outer circle 20 for installing the positioning block 6; the connecting flange 12 is installed on the stepped outer circle 20 of the drilling jig 4 through the positioning block 6, and is in contact with the bottom surface 21 of the step; a circle of chip removal ring grooves 23 is provided on the circumference of the stepped outer circle 20 for removing chips when the connecting flange 12 processes the circumferential holes; seventeen arc-shaped notches 24 are provided on the circumference of the stepped outer circle 20 for preventing the burrs on the circumferential holes from scratching parts and tooling when the connecting flange is removed after processing.

[0047] After the positioning holes 19 on the circumference of the drilling jig 4 and the connecting flange 12 are positioned and installed, the hole spacing of the corresponding holes on the circumference is the same as the hole spacing of the pin hole 15 and the drill sleeve through hole 18.

[0048] A bushing mounting hole 25 is provided at the center of the drilling jig 4 for interference mounting the copper bushing 5 .

[0049] The end surface of the drilling jig 4 is provided with four circumferentially evenly distributed threaded holes a26 and four circumferentially evenly distributed threaded holes b27.

[0050] The fixing pad 8 is provided with four large-head waist-shaped annular grooves 28, and the large-head ends thereof are used to keep away the bolt heads of the fixing bolts 9 during installation.

[0051] The fixing plate 8 is provided with a lightening hole for lightening and avoiding the positioning bolt 10 and the mesh handle 11.

[0052] Processing method for machining holes on the circumference of a connecting flange using the fixture device:

[0053] Step 1: The processing device is fixed on the work surface of the drilling machine through the U-shaped groove 13 on the bottom plate of the base 1 using bolts and washers, and the drill sleeve through hole 18 at the axis center of the stepped drill sleeve 2 is aligned;

[0054] Step 2: Install the connecting flange 12 on the outer circle 20 of the step of the drilling jig 4 through the positioning block 6, ensuring that the holes on its circumference are aligned with the corresponding positioning holes 19 on the circumference of the drilling jig 4, and press and fix it to the bottom surface 21 of the step with the fixing plate 8 and four fixing bolts 9;

[0055] Step 3: Insert the step fixing pin 3 through the pin hole 15 of the upper plate of the base 1 into the first row of starting positioning holes 19 on the circumference of the drilling jig 4 for positioning. Screw the four positioning bolts 10 into the threaded holes b27 on the drilling jig 4, tighten them against the upper limit position on the groove plane 17 of the vertical plate of the base 1, and tighten the drilling jig 4 with the mesh handle 11;

[0056] Step 4: The fitter uses a drilling machine to drill the drill bit through the drill sleeve through hole 18 at the axis of the step drill sleeve 2 (corresponding to the positioning hole 19 for the step fixing pin 3 to locate the pin) to connect the hole on the circumference of the flange 12;

[0057] Step 5: Loosen the mesh handle 11, turn the jig 4 by hand, insert the step fixing pin 3 into the next positioning hole 19 in the first row on the circumference of the jig 4, and repeat steps 2, 3, 4, and 5 until the first row of holes is machined;

[0058] Step 6: The processing steps and principles for the second row of holes and the third hole are the same as those for the first row of holes. Repeat steps 2, 3, 4, and 5 until the second row of holes and the third hole are processed.

[0059] The above specific implementation methods or cases are only used to explain the technical solutions of the present invention and are not intended to limit the present application. Any parts not described in detail are regarded as conventional technical means or common knowledge in the field. Those skilled in the art should understand that based on the design concept of the present application, the technical solutions described in the aforementioned implementation methods can be adaptively modified, or some or all of the technical features therein can be replaced by equivalents. 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 device for machining holes on the circumference of an intake duct connecting flange, characterized in that: The cam is fixed to the workbench, and the cam is fixed to the workbench, and the cam is fixed to the workbench, and the cam is fixed to the workbench, and the cam is fixed to the workbench, and the cam is fixed to the workbench, and the cam is fixed to the workbench, and the cam is fixed to the workbench, and the cam is fixed to the workbench, and the cam is fixed to the workbench, The circumference of the drilling jig is provided with positioning holes with the same relative positions and relative angles as the holes on the circumference of the connecting flange; the drilling jig is provided with a stepped outer circle, and a positioning groove is provided on the circumference of the stepped outer circle for installing a positioning block; the connecting flange is installed on the stepped outer circle of the drilling jig through the positioning block, and fits with the bottom surface of the stepped outer circle; a circle of chip removal ring grooves is provided on the circumference of the step outer circle, which is used for chip removal when the connecting flange is processed on the circumference of the hole; an arc-shaped notch is provided on the circumference of the step outer circle, which is used to prevent the burrs on the circumference of the hole from scratching parts and tooling when the connecting flange is removed after processing; the positioning holes on the circumference of the drilling jig are the same as the hole spacing of the corresponding holes on the circumference after the connecting flange is positioned and installed, and the hole spacing of the pin hole and the drill sleeve through hole.

2. The device for machining holes on the circumference of an intake duct connecting flange according to claim 1, characterized in that: A U-shaped groove is provided on the bottom plate of the base, which is used to be installed and fixed on the work surface of the drilling machine through bolts and washers.

3. The device for machining holes on the circumference of the air intake duct connecting flange according to claim 2, characterized in that: The base vertical plate is provided with a groove plane for positioning bolts to tighten and limit; the center of the base vertical plate is provided with a shaft mounting hole for mounting the shaft.

4. The device for machining holes on the circumference of the air intake duct connecting flange according to claim 3, characterized in that: A bushing mounting hole is provided at the center of the drilling jig for interference mounting of a copper bushing; and four circumferentially evenly distributed threaded holes a and four circumferentially evenly distributed threaded holes b are provided on the end face of the drilling jig.

5. The device for machining holes on the circumference of the air intake duct connecting flange according to claim 4, characterized in that: The fixing pad is provided with four large-head waist-shaped annular grooves, and the large-head ends are used to keep away the bolt heads of the fixing bolts during installation.

6. A method for machining holes on the circumference of a connecting flange using the machining device according to claim 5, characterized in that: The method comprises the following steps: Step 1: Fix the processing device to the work surface of the drilling machine through the U-shaped groove on the bottom plate of the base with bolts and washers, and align the drill sleeve through hole at the axis center of the stepped drill sleeve; Step 2: Install the connecting flange on the outer circle of the step of the drilling jig through the positioning block, ensuring that the holes on its circumference are in the same direction as the corresponding positioning holes on the circumference of the drilling jig, and tighten it to the bottom surface of the step with a fixing plate and four fixing bolts; Step 3: Insert the step fixing pins through the pin holes of the upper plate of the base into the first row of starting positioning holes on the circumference of the drilling jig. Screw the four positioning bolts into the threaded holes b on the drilling jig, tighten them against the upper limit position on the groove plane of the base vertical plate, and secure the drilling jig with the mesh handle. Step 4: The fitter uses a drilling machine to insert the drill bit through the drill sleeve through hole at the axis of the stepped drill sleeve to machine the hole on the circumference of the connecting flange; Step 5: Loosen the mesh handle, turn the jig by hand, insert the step fixing pin into the next positioning hole in the first row on the circumference of the jig, and repeat steps 2 to 5 until the first row of holes is machined; Step 6: The processing steps and principles for the second and third rows of holes are the same as those for the first row of holes. Repeat steps 2 to 5 until the second and third rows of holes are completed.

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