Rapid drilling and positioning method for blind hole of groove in inner wall of cylinder

Abstract

The invention relates to the field of drilling positioning methods, in particular to a cylinder inner wall groove blind hole rapid drilling positioning method which comprises the steps that a machining tool with the outer diameter smaller than a preset amount of the inner diameter of a cylindrical workpiece is placed in a cylinder, and the machining tool is aligned with a groove in the inner wall of the cylindrical workpiece; the machining tool is made to abut against the flanges on the upper side and the lower side of the groove, and the cylindrical workpiece is limited in the axial direction in the mode that a plurality of positioning pin holes in the machining tool are combined with positioning pins; the machining tool is rotated, so that the cross curve on the machining tool is aligned with the cross curve on the inner wall of the cylindrical workpiece; after the cross curves are aligned, the distance between the inner wall of the machining tool and the inner wall of the cylindrical workpiece is measured and then added with the excircle deviation value of the machining tool, then the circle center is aligned, and after alignment, position and depth machining is conducted on the blind hole in the cylinder wall of the cylindrical workpiece. The drilling positioning difficulty of the groove blind hole in the inner wall of the cylindrical workpiece is greatly reduced, the drilling accuracy and efficiency are improved, the workload of operators is reduced, and the operation of the operators is facilitated.

Description

Technical Field

[0001] This invention relates to the field of drilling positioning methods, and specifically to a method for rapid drilling and positioning of blind holes in grooves on the inner wall of a cylinder. Background Technology

[0002] In fields such as machinery manufacturing, oil drilling, and pipeline engineering, the blind hole machining of grooves on the inner wall of cylindrical workpieces is a key process to ensure the functionality of equipment.

[0003] However, the traditional drilling method for machining blind holes in the inner wall grooves of cylindrical workpieces, which relies on manual positioning with rulers and gauges, suffers from drawbacks such as high operational difficulty, low positioning efficiency, serious error accumulation, and frequent start-stop of the drilling machine to coordinate with manual positioning, making it difficult to deliver products quickly.

[0004] Especially when the number of holes required for cylindrical workpieces is very large, such as hundreds, the drilling operation becomes difficult, the positioning efficiency is low, and the accumulation of errors is serious, which will lead to extremely low work efficiency. Summary of the Invention

[0005] The present invention aims to provide a method for rapid drilling and positioning of blind holes in the inner wall groove of a cylindrical workpiece, so as to solve the problem of high operational difficulty in drilling holes in the inner wall of cylindrical workpieces.

[0006] The present invention provides a method for rapid drilling and positioning of blind holes in grooves on the inner wall of a cylinder, comprising the following steps: Step 1: Place the machining fixture with an outer diameter smaller than the preset inner diameter of the cylindrical workpiece into the cylindrical workpiece, and align the machining fixture with the groove on the inner wall of the cylindrical workpiece. Let the machining fixture rest against the flanges on the upper and lower sides of the groove. Through the multiple positioning pin holes on the machining fixture, the positioning pins rest against the inner wall of the groove to limit the axial movement of the cylindrical workpiece. Step 2: Rotate the machining fixture until the crosshairs on the machining fixture are aligned with the crosshairs on the inner wall of the cylindrical workpiece. Step 3: After aligning the crosshairs, measure the distance between the inner wall of the machining fixture and the inner wall of the cylindrical workpiece. Then add the distance to the outer circle offset value of the machining fixture to find the center. After finding the center, machine the position and depth of the blind hole in the cylindrical workpiece wall.

[0007] The beneficial effects of this plan are: By first limiting the axial direction of the cylindrical workpiece, then rotating it to align the crosshairs radially, and finally aligning the center, the machining error caused by the non-circular machining fixture is reduced. This greatly reduces the difficulty of drilling and positioning blind holes in the grooves on the inner wall of the cylindrical workpiece, accelerates drilling accuracy and efficiency, reduces the workload of operators, and facilitates their operation.

[0008] Furthermore, in step 1, the preset amount is... .

[0009] The beneficial effect is that the spacing between the machining fixture and the cylindrical workpiece can be adjusted to reduce fixture wobbling without affecting drilling. Furthermore, in step 2, eight positioning pin holes are provided and evenly distributed at the cross end of a circle.

[0010] The beneficial effect is that the arrangement of the positioning pin holes allows for more uniform force distribution during the limiting of the machining fixture, thus preventing deformation of the machining fixture.

[0011] Furthermore, in step 2, the positioning pin holes are set to be circular, arranged in two symmetrical rows, and the positioning pin holes are kept evenly distributed in the same circumferential direction.

[0012] The beneficial effect is that by setting the locating pin hole, the machining fixture can be rotated to align the crosshairs.

[0013] Furthermore, in step 2, the locating pin hole is offset from the position of the blind hole to be processed, so that the locating pin hole can be inserted into the locating pin.

[0014] Furthermore, in step 2, the distance between the centers of the two locating pin holes on the same radial direction plus the diameter of the locating pin holes is equal to the width of the groove on the inner wall of the cylindrical workpiece. Attached Figure Description

[0015] Figure 1 This is a flowchart illustrating an embodiment of the rapid drilling and positioning method for blind holes in the inner wall groove of a cylinder according to the present invention. Figure 2 These are the front and top views of the machining tooling in an embodiment of the rapid drilling and positioning method for blind holes in the inner wall groove of a cylinder according to the present invention. Figure 3 This is a front view of the positioning pin in an embodiment of the rapid drilling and positioning method for blind holes in the inner wall groove of a cylinder according to the present invention. Figure 4 This is a schematic diagram showing the position of the positioning pin and the cylindrical workpiece in an embodiment of the rapid drilling and positioning method for blind holes in the inner wall groove of the cylinder of the present invention. Detailed Implementation

[0016] The following detailed description provides further details on specific implementation methods.

[0017] The reference numerals in the accompanying drawings include: 1. Machining fixture; 2. Locating pin hole; 3. Lifting threaded hole; 4. Position of blind hole on inner wall of cylindrical workpiece; 5. Groove; 6. Locating pin; 7. Cylindrical workpiece.

[0018] A method for rapid drilling and positioning of blind holes in grooves on the inner wall of a cylinder is provided, for example, drilling and positioning of blind holes in grooves 5 on the inner wall. Figure 2The blind hole 4 on the inner wall of the cylindrical workpiece 7 is located at a position. A relatively long cylindrical workpiece 7 is also drilled for positioning. The length of the cylindrical workpiece 7 is greater than or equal to 2m. Two lifting threaded holes 3 are opened on the machining fixture 1 to facilitate lifting operations. The two lifting threaded holes 3 are located on the same circumference in opposite positions and do not affect the setting of other parts, such as... Figure 1 As shown, it includes the following steps: Step 1: Place the machining fixture 1, whose outer diameter is smaller than the preset inner diameter of the cylindrical workpiece 7, into the cylindrical workpiece 7, aligning the machining fixture 1 with the groove 5 on the inner wall of the cylindrical workpiece 7. Position the machining fixture 1 against the flanges on the upper and lower sides of the groove 5. The multiple positioning pin holes 2 on the machining fixture 1, combined with positioning pins 6, abut against the inner wall of the groove 5, thus limiting the axial movement of the cylindrical workpiece 7. The specific positions are as follows... Figure 4 As shown, the preset amount is The specific structure of machining fixture 1 is as follows: Figure 2 As shown, the locating pin 6 is as follows Figure 3 As shown.

[0019] Step 2: Rotate the machining fixture 1 so that the crosshairs on the machining fixture 1 are aligned with the crosshairs on the inner wall of the cylindrical workpiece 7. Set the positioning pin holes 2 to be circular and keep the positioning pin holes 2 evenly distributed in the same circumferential direction. Set eight positioning pin holes 2 and set them in two rows symmetrically, that is, set the positioning pin holes 2 on two circumferences, with four positioning pin holes 2 on each circumference. The positioning pin holes 2 are located near the two ends of the machining fixture 1, and the eight positioning pin holes 2 are evenly distributed at the crosshairs of a circle.

[0020] The locating pin hole 2 is offset from the position of the blind hole to be machined, so that the locating pin hole 2 can be inserted into the locating pin 6. The distance between the centers of the two locating pin holes 2 on the same radial direction plus the diameter of the locating pin hole 2 is equal to the width of the groove 5 on the inner wall of the cylindrical workpiece 7.

[0021] Step 3: After aligning the crosshairs, measure the distance between the inner wall of machining fixture 1 and the inner wall of cylindrical workpiece 7. Then, add this distance to the outer diameter offset of machining fixture 1 to find the center. After alignment, machine the blind hole in the cylindrical workpiece 7 according to its position and depth. For example, at the fixture positioning mark "I", the measured outer diameter differs from the basic value by -0.14, and the measured fixture wall thickness differs from the basic value by +0.05. After adding these two offset values, set the inner hole alignment value to -0.09. Then, measure the distance between the inner wall of the cylinder cover machining fixture 1 and the inner wall of the cylindrical workpiece 7 to find the center.

[0022] Because the cylindrical workpiece 7 is quite long, exceeding 2 meters, and contains multiple grooves 5 and numerous blind holes (numbering in the hundreds), existing methods suffer from low processing efficiency. Therefore, compared to the traditional method of manually drilling and marking for internal grooves 5, the method in this embodiment significantly reduces the difficulty of positioning the blind holes in the cylindrical inner wall grooves 5, accelerates drilling accuracy and efficiency, reduces the workload of operators, and facilitates their operation.

[0023] The above descriptions are merely embodiments of the present invention, and common knowledge regarding specific structures and characteristics is not elaborated upon here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the structure of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A method for rapid drilling and positioning of blind holes in grooves on the inner wall of a cylinder, characterized in that, Includes the following steps: Step 1: Place the machining fixture with an outer diameter smaller than the preset inner diameter of the cylindrical workpiece into the cylindrical workpiece, and align the machining fixture with the groove on the inner wall of the cylindrical workpiece. Let the machining fixture rest against the flanges on the upper and lower sides of the groove. Through the multiple positioning pin holes on the machining fixture, the positioning pins rest against the inner wall of the groove to limit the axial movement of the cylindrical workpiece. Step 2: Rotate the machining fixture until the crosshairs on the machining fixture are aligned with the crosshairs on the inner wall of the cylindrical workpiece. Step 3: After aligning the crosshairs, measure the distance between the inner wall of the machining fixture and the inner wall of the cylindrical workpiece. Then add the distance to the outer circle offset value of the machining fixture to find the center. After finding the center, machine the position and depth of the blind hole in the cylindrical workpiece wall.

2. The method for rapid drilling and positioning of blind holes in the inner wall groove of a cylinder according to claim 1, characterized in that: In step 1, the preset amount is .

3. The method for rapid drilling and positioning of blind holes in the inner wall groove of a cylinder according to claim 1, characterized in that: In step 2, eight positioning pin holes are set and evenly distributed at the cross end of a circle.

4. The method for rapid drilling and positioning of blind holes in the inner wall groove of a cylinder according to claim 2, characterized in that: In step 2, the positioning pin holes are set to be circular, arranged in two symmetrical rows, and the positioning pin holes are kept evenly distributed in the same circumferential direction.

5. The method for rapid drilling and positioning of blind holes in the inner wall groove of a cylinder according to claim 4, characterized in that: In step 2, the locating pin hole is offset from the position of the blind hole to be processed, so that the locating pin hole can be inserted into the locating pin.

6. The method for rapid drilling and positioning of blind holes in the inner wall groove of a cylinder according to claim 5, characterized in that: In step 2, the distance between the centers of the two locating pin holes on the same radial direction plus the diameter of the locating pin holes is equal to the width of the groove on the inner wall of the cylindrical workpiece.

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