Milling machining alignment method for nozzle ring blade

Abstract

The invention discloses a milling alignment method for a nozzle ring blade. The alignment efficiency is improved, and the machining qualification rate is increased. The milling tool is clamped on a working table of the machining center, a direction mark is arranged on the milling tool, and in the clamping state, the direction mark of the milling tool is clamped in the negative direction of the Y axis of the machining center; clamping and fixing the end part of the nozzle ring blade on a milling tool along the vertical direction; a tool setting block is installed on a shaft end face groove of the nozzle ring blade, and the alignment face of the tool setting block is aligned; the tool setting block is taken down, the auxiliary disc is placed on a shaft positioning gear of the nozzle ring blade, a pointer of the dial gauge is pressed on an outer ring of the auxiliary disc, the highest point and the lowest point of the auxiliary disc are found out, and the highest point is marked; the highest point mark is rotationally moved to the positive direction of the Y axis of the machining center; the plane gradient is calculated through drawing, and the machining center rotates by a corresponding gradient number; and the C value displayed by the machining center is directly input into a numerical control program for angle compensation.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a milling processing and alignment method for nozzle ring blades. Background Art

[0002] The nozzle ring is a key component in the supercharger. When the gas passes through the nozzle ring, the gas is accelerated and pressurized due to the special internal geometric structure of the nozzle ring. The blade-adjustable nozzle ring can change the internal structure of the nozzle ring by adjusting the blade angle, thereby adjusting the flow rate of the airflow to achieve different supercharging requirements.

[0003] like Figure 1 The figure shows the schematic diagram of the three-dimensional model of the nozzle ring blade casting. Figure 2 This is a three-dimensional schematic diagram of the nozzle ring blades. The content introduced in this patent is Figure 2 The clamping and alignment method of the milled blade root surface in the three-dimensional schematic diagram of the nozzle ring blade.

[0004] The process route is:

[0005] 1. On the turning and milling compound machining center, the shaft part is fine-turned to the drawing size, the side flattening of the milling shaft is milled to the drawing size, and the keyway at the end of the milling shaft is milled to the drawing size for subsequent milling surface alignment;

[0006] 2. Rough and fine mill the blade root surface on the milling machine;

[0007] 3. Use the axis to position and clamp, and mill out the blade top surface.

[0008] Judging from the processing content, alignment is difficult in actual processing. First, the machine operator will use the milling fixture to position and clamp the blade casting surface, turn the machined shaft upward, and align the keyway linear direction to establish the processing coordinate system. Since the blade is a cast blade, the error is large. After positioning and clamping with the blade profile, the axis of the machined shaft is not perpendicular to the workbench. The worker must rely on the method of padding the feeler gauge at the bottom of the fixture to correct the processing plane. This method requires the worker to constantly make corrections, and because the width of the feeler gauge is fixed and the minimum thickness is 0.02mm, the insertion of the feeler gauge affects the tooling range to a large extent. Therefore, during the alignment process, it is very difficult to correct the processing plane to within 0.015mm. In actual operation, the correction process takes an average of 2.5h, and the entire product processing time is less than 2h, which greatly reduces the processing efficiency of the product. After the product is milled on the three-axis machining center, the average contour is in the range of 0.25-0.5, and the qualified rate is low ( Figure 3 As shown, the profile requirement of this surface is 0.3). Summary of the invention

[0009] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a method for aligning a nozzle ring blade during milling, thereby improving the efficiency of alignment and the qualified rate of product processing.

[0010] The object of the present invention is achieved in that:

[0011] A method for aligning the milling process of nozzle ring blades.

[0012] Step 1: On the cradle-type five-axis machining center, clamp the milling tooling on the workbench. The A-axis and C-axis of the machining center can rotate. The milling tooling is provided with a direction mark indicating the clamping direction of the nozzle ring blade. In the clamped state, the direction mark of the milling tooling is clamped toward the negative direction of the Y-axis of the machining center;

[0013] Step 2: vertically clamp and fix the end of the nozzle ring blade on the milling tooling;

[0014] Step 3: Install the tool block on the shaft end face groove of the nozzle ring blade, align the front face of the tool block, and set the nozzle ring blade state to C0. The placement direction of the nozzle ring blade is consistent with the processing direction required by the CNC program, but the clamping accuracy of the nozzle ring blade does not meet the requirements.

[0015] Step 4: Remove the tool setting block, place the auxiliary disc on the shaft positioning gear of the nozzle ring blade, press the needle of the micrometer on the outer ring of the auxiliary disc, and use the auxiliary handwheel of the machining center to rotate the C axis. After rotating the C axis several times, find the highest point and the lowest point of the auxiliary disc, and mark the highest point;

[0016] Step 5: Use the auxiliary hand wheel of the machining center to rotate the C axis and move the highest point mark to the positive direction of the Y axis of the machining center;

[0017] Step 6: Get the height difference through the highest point and the lowest point of the auxiliary disk, and calculate the plane inclination through drawing. Enter the calculated inclination into the A-axis parameter of the machining center and execute it to make the machining center rotate the corresponding inclination degree.

[0018] Step 7: Input the C value displayed by the machining center directly into the CNC program for angle compensation. After compensation, collect the nozzle ring blade status as A0 and C0, collect the new coordinate origin, and run the CNC program to process the nozzle ring blade.

[0019] Preferably, the milling tool is located at the center of the workbench of the machining center.

[0020] Preferably, a tooth block is provided inside the milling tooling, and the mating surface at the upper end of the tooth block is made according to the theoretical curved surface size of the end profile of the nozzle ring blade. When clamping, the end profile of the nozzle ring blade is tightly positioned with the tooth block mating surface, and then the fixing screws are tightened to fix it.

[0021] Preferably, the tool setting block is in a rectangular plate-like structure, the side of the tool setting block is the front face, and a clamping block is provided at the bottom of the tool setting block, which is used to be embedded in the axial end face groove of the nozzle ring blade for positioning.

[0022] Preferably, the auxiliary disc has a cylindrical section, which is sleeved on the shaft of the nozzle ring blade, and the end surface of the cylindrical section contacts the shaft positioning gear of the nozzle ring blade for positioning.

[0023] Preferably, after the sixth step, the flatness of the auxiliary disc plane is checked using the cross-marking method, and the A and C axes are fine-tuned to align the flatness to within 0.015.

[0024] Preferably, if the flatness cannot be adjusted to within 0.015 in one go, calibration is performed by fine-tuning the A-axis and C-axis of the machining center.

[0025] Due to the adoption of the above technical solution, the present invention has the following beneficial effects:

[0026] This method can shorten the original alignment and clamping time on the three-axis machining center from 2.5h to 20-30min, improve the efficiency of alignment, and increase the alignment flatness from the original 0.02-0.03 to 0.01-0.015, and increase the qualified rate of product processing from 60% to more than 95%. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a three-dimensional picture of the nozzle ring blade casting blank;

[0028] Figure 2 It is a three-dimensional schematic diagram of the nozzle ring blades;

[0029] Figure 3 It is the front view of the nozzle ring blade;

[0030] Figure 4 It is a top view of the nozzle ring blades;

[0031] Figure 5 This is the fixture diagram for the nozzle ring blade milling;

[0032] Figure 6 It is a schematic diagram of the position and direction of the spindle and rotary axis of the cradle-type five-axis machining center;

[0033] Figure 7 Tool setting block for rough alignment of auxiliary C axis;

[0034] Figure 8 Auxiliary disc for auxiliary A-axis alignment and fine adjustment;

[0035] Fig. 9 This is a schematic diagram of fine adjustment and correction;

[0036] Fig.10Schematic diagram of the nozzle ring blade milling tooling.

[0037] Reference numerals

[0038] In the accompanying drawings, 1 is a connecting bolt, 2 is a tool clamping bolt, 3 is a tool clamping block, 4 is a cylindrical clamping screw (fitted on the cylindrical section of the radially clamped and fixed auxiliary disc, and a corresponding limiting step is provided on the axis of the nozzle ring blade), 5 is an auxiliary disc, 6 is a tool setting block, 7 is a milling tool body, and 8 is a fastening screw (for tightening the blades). DETAILED DESCRIPTION

[0039] This patent introduces a clamping and alignment method for milling the root surface of nozzle ring blades on a cradle-type five-axis machining center. The spindle and rotary axis of the cradle-type five-axis machining center are as follows: Figure 6 As shown, this type of machining center has rotatable A\C axes. The alignment method introduced in this patent uses the rotatable A\C axes of this type of equipment to perform product correction. The main contents of this patent are:

[0040] 1. There is a tooth block inside the milling tooling. The tooth block profile is made according to the theoretical surface size of one side of the blade profile. When clamping, the nozzle ring blade and the tooth block mating surface are close together and then the fixing screws are tightened;

[0041] 2. There is a front-finding function on the tooling. After the front-finding function is aligned, the current state is collected as C0. At this time, the part placement state is consistent with the part processing direction required by programming, but the clamping accuracy of the part does not meet the requirements at this time;

[0042] 3. The axis and end face of the nozzle ring blade are small, and the flatness of the axis positioning gear cannot be directly detected. It is necessary to use an auxiliary disc and place the auxiliary disc naturally on the axis positioning gear, as shown in the figure;

[0043] 4. Press the dial indicator needle on the outer ring of the auxiliary disc and use the machine tool auxiliary handwheel to rotate the C axis. After rotating the C axis several times, find the highest point of the auxiliary disc, mark it, and rotate the mark to the positive direction of the Y axis;

[0044] 5. When rotating the C axis to find the high and low points of the auxiliary disk, record the height difference, and calculate the plane inclination by drawing. Enter the calculated inclination into the machine tool A axis parameters and execute it to rotate the machine tool to the corresponding inclination degree;

[0045] 6. After completing the above operations, use the cross-meter method to check the flatness of the auxiliary disc plane. After rough adjustment, the flatness is greatly improved. Only fine adjustment of the A and C axes is required to easily adjust the flatness to within 0.02.

[0046] 7. Record the C value of the machine tool at this time in the above state, and re-collect the current state of the machine tool as A0 and C0. Input the recorded C value directly into the coordinate rotation instruction of the CNC program;

[0047] 8. Execute CNC programs to process parts.

[0048] The specific steps are:

[0049] Step 1: Clamp the tooling on the workbench with the tooling direction mark facing the Y-direction of the machine tool spindle, and clamp it roughly in the center of the workbench to facilitate subsequent alignment;

[0050] Step 2: Insert the inner arc of the nozzle ring blade toward the gear block, tighten the screws on the other side, and place the blade close to the gear block to complete the initial clamping;

[0051] Step 3: Install the tool setting block on the spindle end face groove and set the long side of the tool setting block to C0;

[0052] Step 4: Remove the tool setting block, install the auxiliary disc on the shaft, use the micrometer to rotate and roughly hit the highest point of the outer circle plane on the disc, and mark it;

[0053] Step 5: Use the hand wheel to move the marked highest point to the Y+ direction of the machine tool spindle, and use the micrometer to mark the height difference between Y+ and Y-, that is, the height difference of the surface;

[0054] Step 6: The angle value of the high and low point difference can be obtained by drawing, and the obtained angle value is input into the A axis of the machine tool. At this time, the flatness of the meter base can be calibrated by the cross calibration method to obtain a roughly horizontal plane;

[0055] Step 7: If the plane is not aligned to 0.015 at one time, you can calibrate it by fine-tuning the A / C axis. After the rough adjustment, the fine adjustment can be corrected quickly;

[0056] Step 8: C0 is set in the early stage. After calibration, the C value displayed by the machine tool is directly input into the CNC program for angle compensation. After compensation, the part status is collected as A0\C0, and the new coordinate origin is collected to run the CNC program.

[0057] Finally, it should be noted that the above preferred 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 through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present invention.

Claims

1. A method for aligning a nozzle ring blade by milling, characterized in that: Step 1: On the cradle-type five-axis machining center, clamp the milling tooling on the workbench. The A-axis and C-axis of the machining center can rotate. The milling tooling is provided with a direction mark indicating the clamping direction of the nozzle ring blade. In the clamped state, the direction mark of the milling tooling is clamped toward the negative direction of the Y-axis of the machining center; Step 2: vertically clamp and fix the end of the nozzle ring blade on the milling tooling; Step 3: Install the tool block on the shaft end face groove of the nozzle ring blade, align the front face of the tool block, and set the nozzle ring blade state to C0. The placement direction of the nozzle ring blade is consistent with the processing direction required by the CNC program, but the clamping accuracy of the nozzle ring blade does not meet the requirements. Step 4: Remove the tool setting block, place the auxiliary disc on the shaft positioning gear of the nozzle ring blade, press the needle of the micrometer on the outer ring of the auxiliary disc, and use the auxiliary handwheel of the machining center to rotate the C axis. After rotating the C axis several times, find the highest point and the lowest point of the auxiliary disc, and mark the highest point; Step 5: Use the auxiliary hand wheel of the machining center to rotate the C axis and move the highest point mark to the positive direction of the Y axis of the machining center; Step 6: Get the height difference through the highest point and the lowest point of the auxiliary disk, and calculate the plane inclination through drawing. Enter the calculated inclination into the A-axis parameter of the machining center and execute it to make the machining center rotate the corresponding inclination degree. Step 7: Input the C value displayed by the machining center directly into the CNC program for angle compensation. After compensation, collect the nozzle ring blade status as A0 and C0, collect the new coordinate origin, and run the CNC program to process the nozzle ring blade.

2. A method for aligning a nozzle ring blade by milling according to claim 1, characterized in that: The milling tool is located at the center of the workbench of the machining center.

3. The method for aligning a nozzle ring blade by milling according to claim 1, characterized in that: A tooth block is provided inside the milling tooling, and the matching surface at the upper end of the tooth block is made according to the theoretical surface size of the end profile of the nozzle ring blade. When clamping, the end profile of the nozzle ring blade and the matching surface of the tooth block are closely positioned, and then the fixing screws are tightened to fix them.

4. The method for aligning a nozzle ring blade by milling according to claim 1, characterized in that: The tool setting block is in a rectangular plate-like structure, the side of the tool setting block is the front face, and a clamping block is provided at the bottom of the tool setting block. The clamping block is used to be embedded in the shaft end face groove of the nozzle ring blade for positioning.

5. The method for aligning a nozzle ring blade by milling according to claim 1, characterized in that: The auxiliary disc has a cylindrical section, which is sleeved on the shaft of the nozzle ring blade, and the end surface of the cylindrical section contacts the shaft positioning gear of the nozzle ring blade for positioning.

6. The method for aligning a nozzle ring blade by milling according to claim 1, characterized in that: After the sixth step, use the cross-marking method to check the flatness of the auxiliary disc plane, and make fine adjustments on the A and C axes to align the flatness to within 0.

015.

7. A method for aligning a nozzle ring blade by milling according to claim 6, characterized in that: If the flatness cannot be adjusted to within 0.015 in one go, fine-tune the A-axis and C-axis of the machining center for calibration.

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