Indexing device for machining circumferential multi-row holes of hanging basket barrel

Abstract

The utility model belongs to a dividing device, and particularly relates to a dividing device for machining a plurality of rows of holes in the circumferential direction of a hanging basket barrel. The dividing device for machining the annular multi-row holes of the hanging basket barrel comprises a mechanical dividing device, a left top plate, a right dividing top plate and a tailstock, the left top plate and the right dividing top plate are arranged on the two sides of the hanging basket barrel, the left top plate corresponds to a mechanical dividing head of the mechanical dividing device in position, and the right dividing top plate corresponds to the tailstock in position. The tool has the advantages that the tool is simple, reasonable and compact in design and easy to install, the combined type specific indexing clamping tool is designed and manufactured, the quality risk that the circumferential distance between the last column of narrow and long circular grooves and the first column of narrow and long circular grooves cannot meet the drawing requirement when the last column of narrow and long circular grooves is machined due to large accumulated errors caused by out-of-tolerance indexing precision is avoided, and the machining efficiency is improved. The precision requirement for indexing of 100 rows of annular narrow and long circular grooves in a large special-material forged pipe is met, and the combined type specific indexing clamping tool meets the use requirement through actual machining and verification of machined workpieces.

Description

Technical Field

[0001] The invention belongs to a dividing device, in particular to a dividing device for processing circumferential multiple rows of holes in a hanging basket cylinder. Background Art

[0002] The size of the nuclear power plant hanging basket cylinder is relatively large, with dimensions of Φ476mm×8mm and a length of 1228mm. It is necessary to divide the hanging basket cylinder into 100 rows along the circumferential direction, with 20 long circular grooves of 33mm length and 3mm width in each row, for a total of 2000. The hanging basket cylinder is made of Ti35 forgings, and its single piece diagram is shown in Figure 1.

[0003] The traditional processing method is: use marking to evenly distribute 100 rows of long circular grooves along the circumference to find the alignment reference line, and then use a milling machine or boring machine to align with the alignment reference line for each row. After each row is processed, the workpiece is manually rotated, and the alignment of the next row is repeated before processing. Not only is the alignment process time long, but because the 100 rows of long circular grooves are staggered holes, the starting references of two adjacent rows of long circular grooves are different. During the process, it is easy to repeatedly adjust the processing parameters, resulting in the risk of incorrect processing of the long circular groove starting reference.

[0004] The disadvantages of the traditional method are: 1. Long auxiliary time in the process;

[0005] Marking the alignment reference line along the circumference can easily cause scratches on the material surface, and the alignment reference lines are so densely packed that the operator may easily mistake the line.

[0006] Repeatedly aligning the marking reference and repeatedly adjusting the starting point processing reference can easily lead to quality risks in the processing errors of the long circular groove starting point. Utility Model Content

[0007] Aiming at the defects of the prior art, the invention provides a dividing device for machining circumferential multiple rows of holes in a hanging basket cylinder.

[0008] The present invention is realized as follows: a dividing device for processing circumferential multiple rows of holes in a hanging basket cylinder, which includes a mechanical dividing device, a left top plate, a right dividing top plate and a tailstock, wherein the left top plate and the right dividing top plate are arranged on both sides of the hanging basket cylinder, the left top plate corresponds to the position of the mechanical dividing head of the mechanical dividing device, and the right dividing top plate corresponds to the position of the tailstock.

[0009] As described above, a dividing device for processing circumferential multiple rows of holes in a hanging basket cylinder, wherein the left top plate is a disc-shaped part, the size of the left top plate matches the size of the hanging basket cylinder, a protrusion is set at the center position of the left top plate, and the position of the protrusion corresponds to the position of the mechanical dividing head.

[0010] As described above, a dividing device for processing circumferential multiple rows of holes on a hanging basket cylinder, wherein the right dividing top plate, the size of the right dividing top plate matches the size of the hanging basket cylinder, a groove is set at the center position of the right dividing top plate, and the position of the groove corresponds to the position of the tailstock; a plurality of positioning holes are evenly arranged on the right dividing top plate, and the setting positions of the positioning holes are consistent with the circumferential distribution of the narrow and long circular grooves on the hanging basket cylinder.

[0011] As described above, a dividing device for processing multiple rows of circumferential holes in a hanging basket cylinder has a total of 100 positioning holes arranged on the right dividing top plate.

[0012] As described above, a dividing device for processing multiple rows of circumferential holes in a hanging basket cylinder, wherein the positioning holes provided on the right dividing top plate are arranged in two circles.

[0013] As described above, a dividing device for processing multiple rows of circumferential holes in a hanging basket cylinder, wherein the two circles of positioning holes provided on the right dividing top plate have the same number, both 50, and are evenly arranged along the circumference.

[0014] As described above, a dividing device for processing multiple rows of circumferential holes in a hanging basket cylinder, wherein the two circles of positioning holes provided on the right dividing top plate have positions of positioning holes in adjacent circles staggered.

[0015] The remarkable effects of this new type are: simple, reasonable, compact and easy to install. The design and manufacture of combined specific indexing clamping tooling avoids the large cumulative error caused by excessive indexing accuracy, which leads to the quality risk that the circumferential spacing between the last row of narrow long circular grooves and the first row does not meet the requirements of the drawing when processing the last row of narrow long circular grooves. The precision requirements of the indexing of 100 rows of circumferential narrow long circular grooves on the large forged pipe of special materials are guaranteed. Through actual processing and verification of the workpiece after processing, this combined specific indexing clamping tooling meets the use requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1a This is a single-piece drawing of the "hanging basket cylinder";

[0017] Figure 1b for Figure 1a Right view;

[0018] Figure 2 This is the assembly drawing of the "combined specific indexing fixture";

[0019] Figure 3a This is the "left top plate" parts drawing;

[0020] Figure 3b for Figure 3a Side view of

[0021] Figure 4a This is the part drawing of the "right indexing top plate"

[0022] Figure 4b for Figure 4a Side view of

[0023] In the figure: 1. Mechanical dividing head, 2. Left top plate, 3. Hanging basket cylinder, 4. Right dividing top plate, 5. Tailstock, 6. Square box. DETAILED DESCRIPTION

[0024] A dividing device for machining multiple rows of circumferential holes in a hanging basket cylinder (see Figure 2 ), according to the inner diameter of the hanging basket, two top plates with stoppers are designed and manufactured (see Figure 3 and Figure 4), and the two top plates are respectively embedded in the two ends of the hanging basket cylinder as a whole; the hanging basket cylinder together with the two top plates are clamped between the mechanical indexing head and the tailstock, and the left top plate is clamped by the mechanical indexing head claw to limit the lateral freedom of the workpiece, and the tailstock is used to tighten the hanging basket cylinder to limit the axial freedom of the workpiece; the mechanical indexing scale and the positioning holes evenly distributed on the right top plate are used to double guarantee the indexing of the narrow long circular holes arranged circumferentially in an alternating manner on the hanging basket cylinder; the skip indexing principle is adopted in the indexing process to ensure that the narrow long circular grooves with the same axial positioning size are processed at one time, and then another narrow long circular groove with the same axial positioning is processed. The specific structure and working principle of the combined special indexing clamping device are as follows:

[0025] a. Combined special indexing clamping device consists of mechanical indexing head, left top plate, hanging basket cylinder, right indexing top plate, tailstock and square box, such as Figure 2 The right dividing top plate is processed with a top hole and 100 positioning holes equally divided along the circumferential direction and staggered inside and outside (consistent with the circumferential distribution of the narrow and long circular grooves of the hanging basket cylinder).

[0026] b. Press the direction, mechanical indexing head and tailstock onto the workbench of the CNC gantry milling and boring machine, and adjust the axis of the mechanical indexing head and the axis of the tailstock center to be on the same axis.

[0027] c. The left top plate and the right indexing top plate with positioning stop are embedded into the inner diameters of both ends of the hanging basket cylinder as one body. The indexing rotates with the rotation of the hanging basket cylinder, so that the mechanical indexing head can clamp the left top plate with the chuck through the diameter change of the left top plate to limit the lateral freedom of the hanging basket cylinder. The tailstock is used to press the hanging basket cylinder with the right indexing top plate to limit its axial freedom.

[0028] d. Use the indexing plate on the mechanical indexing head to first divide the hanging basket cylinder into 50 equal parts for indexing control. At the same time, use the 50 evenly distributed positioning holes in the outer circle of the right indexing top plate to reversely verify the correctness of the indexing head. That is, when the first row is processed, the indexing head is rotated 7.2° to process the next row of narrow long circular grooves with the same axial positioning until all 50 rows are processed.

[0029] The preset slots on the right indexing plate are two circles of staggered and evenly distributed positioning holes. A fixed top is set on the outside of the right indexing plate. When the hanging basket cylinder rotates, the right indexing plate rotates with the hanging basket cylinder, and the fixed top does not rotate. When the next hole on the indexing plate is rotated to the position of the fixed top, it proves that the next row of oblong slots on the hanging basket has been rotated to the processing position, completing the indexing rotation of the hanging basket cylinder.

[0030] e. When machining the 51st row of narrow long circular grooves, the indexing head should be adjusted by 3.6° based on the 50th row of narrow long circular grooves to determine the indexing of the 51st row of narrow long circular grooves. At the same time, the correctness of the indexing head indexing should be reversely verified through the 50 equally indexed positioning holes on the inner ring of the right indexing top plate. Adjust the axial positioning program of the CNC gantry milling and boring machine and begin machining another 50 rows of narrow long circular grooves with the same axial positioning dimensions until all machining is completed.

[0031] Without multi-disc control on the right side, using only a mechanical indexing head for indexing, there are 100 rows of oblong slots in the circumference, with each row indexing at an angle of 3.6°. If the first 99 rows of oblong slots are indexed with a positive deviation of 3.61°, the angle of the first 99 rows of oblong slots will be 357.39°, while the angle of the last row will be 2.61°, 1° less than 3.61°. This will result in uneven circumferential quality when machining the last row of oblong slots compared to the other rows.

[0032] The present invention will be further described below with reference to the accompanying drawings.

[0033] 1. As attached Figure 2 As shown in Figures 3 and 4, first assemble the hanging basket cylinder, the left top plate and the right indexing top plate into one body.

[0034] 2. Clamp the square box, mechanical indexing head and tailstock onto the workbench of the CNC gantry milling and boring machine, ensuring that the rotation axis of the mechanical indexing head is the same as that of the tailstock.

[0035] 3. Clamp the hanging basket cylinder together with the left top plate and the right indexing top plate between the mechanical indexing head and the tailstock. Use the mechanical indexing head claws to clamp the left top plate, and the tailstock to press the right indexing top plate together with the hanging basket cylinder, so that the hanging basket cylinder can only rotate along the axis.

[0036] 4. Use a CNC gantry milling and boring machine to perform skip-row processing on the narrow long circular grooves on the hanging basket cylinder, that is, first process 50 rows of narrow long circular grooves with the same axial positioning dimensions, and rotate 7.2° after each row is processed (corresponding to the 50 evenly distributed positioning holes on the outer ring of the right indexing top plate for reverse verification); then perform another set of 50 rows of narrow long circular grooves with the same axial positioning dimensions, rotate 3.6° in the 50th and 51st rows, and then rotate 7.2° (corresponding to the 50 evenly distributed positioning holes on the inner ring of the right indexing top plate for reverse verification).

[0037] 5. After processing, loosen the tailstock to remove the hanging basket cylinder.

Claims

1. A dividing device for machining multiple rows of circumferential holes in a hanging basket cylinder, characterized by: The invention comprises a mechanical indexing device, a left top plate (2), a right indexing top plate (4) and a tailstock (5), wherein the left top plate (2) and the right indexing top plate (4) are arranged on both sides of a hanging basket cylinder (3), the left top plate (2) corresponds to the position of a mechanical indexing head (1) of the mechanical indexing device, and the right indexing top plate (4) corresponds to the position of the tailstock (5); The left top plate (2) is a disc-shaped part. The size of the left top plate (2) matches the size of the hanging basket cylinder (3). A protrusion is provided at the center of the left top plate (2). The position of the protrusion corresponds to the position of the mechanical dividing head (1). The right indexing top plate (4) has a size that matches the size of the hanging basket cylinder (3), and a groove is provided at the center of the right indexing top plate (4), the position of the groove corresponding to the position of the tailstock (5); a plurality of positioning holes are evenly provided on the right indexing top plate (4), and the setting positions of the positioning holes are consistent with the circumferential distribution of the narrow long circular grooves on the hanging basket cylinder; There are 100 positioning holes provided on the right indexing top plate (4); The positioning holes provided on the right indexing top plate (4) are arranged in two circles; The number of positioning holes in the two circles provided on the right indexing top plate (4) is the same, both being 50, and are evenly arranged along the circumference; The two circles of positioning holes provided on the right indexing top plate (4) are such that the positions of the positioning holes in adjacent circles are staggered.

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