GIS casting inner cavity conductor fixing plate reverse taper hole machining process

Abstract

The invention relates to a machining process for a reverse taper hole of a GIS casting inner cavity conductor fixing plate. The machining process is characterized by comprising the following specific machining processes that S1, a drill jig is manufactured; s2, machining a drill bit; s3, manual drilling; s4, mounting a counter-drawing taper hole cutter; s5, a reverse taper hole is machined; s6, the other taper hole is machined; according to the method, a flange at the end of the GIS casting is adopted as a reference surface, a drill jig is firstly machined, a through hole structure with the diameter being 16 mm is drilled in a conductor fixing plate after positioning of the drill jig, reverse drilling is conducted through a special cutting edge with taper after the drill jig is withdrawn, one end with the diameter being 16 mm is embedded into the through hole structure from the back face of the conductor fixing plate, and then the end with the diameter being 16 mm is inserted into the through hole structure through a special cutting edge with taper; and connecting an upper right-angle pneumatic tool to gradually broach so as to finish a taper hole of which the diameter of one end is 18mm and the diameter of the other end is 16mm on the conductor fixing plate.

Description

Technical Field

[0001] The invention relates to the technical field of casting drilling, and in particular to a reverse taper hole processing technology for a conductor fixing plate in an inner cavity of a GIS casting. Background Art

[0002] In the inner cavity of the high-voltage electrical aluminum alloy casting GIS shell, due to the particularity of installing conductors, the conductors of the GIS casting shell are fixed with taper screws. This fixing method brings great difficulties to processing, because the shell of the shell is closed and the tapered hole in this part cannot be processed from the outside of the shell. Therefore, a new processing method is needed to realize the reverse tapered hole processing on the conductor fixing plate. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a reverse tapered hole processing technology for a conductor fixing plate in an inner cavity of a GIS casting, which can solve the problem that the reverse tapered hole in the conductor fixing plate in the inner cavity of a GIS casting cannot be processed from the outside.

[0004] In order to solve the above technical problems, the technical solution of the present invention is: a reverse taper hole processing technology for the conductor fixing plate in the inner cavity of a GIS casting, and its innovation lies in: the specific processing technology is as follows:

[0005] S1: Drilling jig production: Two through holes with a diameter of 18 mm are machined on the side of the drilling jig, and the center distance between the two through holes is the same as the center distance of the flange surface of the GIS casting end face; the upper plane of the drilling jig extends 260 mm into the inner cavity of the GIS casting at the conductor fixing plate, and two through holes with a diameter of 22 mm are made with a center distance of 42 mm; at the same time, a drilling jig sleeve with an outer diameter of 22 mm and an inner diameter of 16.1 mm is embedded in the through hole with a diameter of 22 mm;

[0006] S2: Drill bit processing: The tail end of the drill bit with a diameter of 16 mm is processed to a diameter of 12 mm and then clamped with a pneumatic tool; then the two through holes with a diameter of 18 mm on the side of the drill jig are fixed to the external flange surface of the GIS casting through positioning pins to achieve the fastening of the drill jig;

[0007] S3: Manual drilling: Use a right-angle pneumatic tool with a clamped drill bit to manually drill a through hole with a diameter of 16 mm at the position where two tapered holes are required to be drilled on the drilling jig sleeve. After completing the drilling of the through hole with a diameter of 16 mm, remove the drilling jig from the GIS casting;

[0008] S4: Installation of the reverse taper hole tool: Remove the 16mm diameter drill bit on the right-angle pneumatic tool to clamp the reverse taper hole tool; insert the handle of the reverse taper hole tool into the 16mm diameter through hole that has been drilled, and then install the part with the tapered cutting edge of the tool from the back side of the conductor fixing plate installation into the front end of the special tool handle, and rotate the part with the tapered cutting edge in the opposite direction so that the tapered cutting edge part does not fall off during processing;

[0009] S5: Processing of reverse tapered hole: The pneumatic right-angle pneumatic tool is pulled upward so that the tapered edge part cuts the 16mm through hole on the conductor fixing plate to the designed taper requirement;

[0010] S6: Processing of another tapered hole: Repeat steps S4 to S6 to process another tapered hole on the conductor fixing plate.

[0011] Furthermore, the tool in S4 includes a tool head seat, a tool handle and a locking head; the tool head seat is a rotating body structure with an isosceles trapezoidal longitudinal cross-section, and four cutting edge mounting seats are circumferentially arranged on the tool head seat, and cutting edges are arranged on the cutting edge mounting seats, the cutting edge has a rotation diameter of 16 mm at one end, and a rotation diameter of 18 mm at the other end; a connecting hole matching the tool handle is arranged in the axial direction of the tool head seat; one end of the tool handle is arranged through the connecting hole on the tool head seat, and the locking head locks the tool head seat at the end of the tool handle through threaded cooperation.

[0012] The advantages of the present invention are:

[0013] 1) In the present invention, the flange at the end of the GIS casting is used as the reference surface to firstly process a drilling jig, and then a through hole structure with a diameter of 16 mm is drilled on the conductor fixing plate after positioning the drilling jig. After the drilling jig is withdrawn, a special tapered cutting edge is used for reverse drilling, and first one end with a diameter of 16 mm is embedded into the through hole structure from the back of the conductor fixing plate, and then a right-angle pneumatic tool is connected to gradually expand the hole to complete a tapered hole with a diameter of 18 mm at one end and a diameter of 16 mm at the other end on the conductor fixing plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0015] Figure 1 The present invention is a flowchart of the reverse tapered hole processing process of a conductor fixing plate in the inner cavity of a GIS casting.

[0016] Figure 2 This is a structural diagram of a GIS casting inner cavity conductor fixing plate reverse taper hole processing casting of the present invention.

[0017] Figure 3 This is a tool structure diagram for a reverse tapered hole machining process for a conductor fixing plate in an inner cavity of a GIS casting according to the present invention.

[0018] Figure 4 It is a cross-sectional view of the reverse cone hole of a conductor fixing plate in the inner cavity of a GIS casting of the present invention. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] like Figures 1 to 4 The reverse taper hole processing technology of the conductor fixing plate in the inner cavity of a GIS casting is shown, and the specific processing technology is as follows:

[0022] S1: Drilling jig production: Two through holes with a diameter of 18 mm are machined on the side of the drilling jig, and the center distance between the two through holes is the same as the center distance of the flange surface of the GIS casting end face; the upper plane of the drilling jig extends 260 mm into the inner cavity of the GIS casting at the conductor fixing plate, and two through holes with a diameter of 22 mm are made with a center distance of 42 mm; at the same time, a drilling jig sleeve with an outer diameter of 22 mm and an inner diameter of 16.1 mm is embedded in the through hole with a diameter of 22 mm;

[0023] S2: Drill bit processing: The tail end of the drill bit with a diameter of 16 mm is processed to a diameter of 12 mm and then clamped with a pneumatic tool; then the two through holes with a diameter of 18 mm on the side of the drill jig are fixed to the external flange surface of the GIS casting through positioning pins to achieve the fastening of the drill jig;

[0024] S3: Manual drilling: Use a right-angle pneumatic tool with a clamped drill bit to manually drill a through hole with a diameter of 16 mm at the position where two tapered holes are required to be drilled on the drilling jig sleeve. After completing the drilling of the through hole with a diameter of 16 mm, remove the drilling jig from the GIS casting;

[0025] S4: Installation of the reverse taper hole tool: Remove the 16mm diameter drill bit on the right-angle pneumatic tool to clamp the reverse taper hole tool; insert the handle of the reverse taper hole tool into the 16mm diameter through hole that has been drilled, and then install the part with the tapered cutting edge of the tool from the back side of the conductor fixing plate installation into the front end of the special tool handle, and rotate the part with the tapered cutting edge in the opposite direction so that the tapered cutting edge part does not fall off during processing;

[0026] S5: Processing of reverse tapered hole: The pneumatic right-angle pneumatic tool is pulled upward so that the tapered edge part cuts the 16mm through hole on the conductor fixing plate to the designed taper requirement;

[0027] S6: Processing of another tapered hole: Repeat steps S4 to S6 to process another tapered hole on the conductor fixing plate.

[0028] The tool in S4 includes a tool head seat 1, a tool handle 2 and a locking head 3; the tool head seat 1 is a rotating body structure with an isosceles trapezoidal longitudinal section, and four cutting edge mounting seats are circumferentially arranged on the tool head seat 1, and a cutting edge 11 is arranged at the cutting edge mounting seat, and the cutting edge 11 has a rotation diameter of 16 mm at one end and 18 mm at the other end; a connecting hole matching with the tool handle 2 is arranged in the axial direction of the tool head seat 1; one end of the tool handle 2 is passed through the connecting hole on the tool head seat, and the locking head 3 locks the tool head seat 1 at the end of the tool handle 2 through threaded cooperation.

[0029] Those skilled in the art should understand that the present invention is not limited to the above-mentioned embodiments. The above-mentioned embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and improvements, and these changes and improvements shall all fall within the scope of the present invention claimed for protection.

Claims

1. A reverse taper hole processing process for a conductor fixing plate in the inner cavity of a GIS casting, characterized in that: The specific processing technology is as follows: S1: Drilling jig production: Two through holes with a diameter of 18 mm are machined on the side of the drilling jig, and the center distance between the two through holes is the same as the center distance of the flange surface of the GIS casting end face; the upper plane of the drilling jig extends 260 mm into the inner cavity of the GIS casting at the conductor fixing plate, and two through holes with a diameter of 22 mm are made with a center distance of 42 mm; at the same time, a drilling jig sleeve with an outer diameter of 22 mm and an inner diameter of 16.1 mm is embedded in the through hole with a diameter of 22 mm; S2: Drill bit processing: The tail end of the drill bit with a diameter of 16 mm is processed to a diameter of 12 mm and then clamped with a pneumatic tool; then the two through holes with a diameter of 18 mm on the side of the drill jig are fixed to the external flange surface of the GIS casting through positioning pins to achieve the fastening of the drill jig; S3: Manual drilling: Use a right-angle pneumatic tool with a clamped drill bit to manually drill a through hole with a diameter of 16 mm at the position where two tapered holes are required to be drilled on the drilling jig sleeve. After completing the drilling of the through hole with a diameter of 16 mm, remove the drilling jig from the GIS casting; S4: Installation of the reverse taper hole tool: Remove the 16mm diameter drill bit on the right-angle pneumatic tool to clamp the reverse taper hole tool; insert the handle of the reverse taper hole tool into the 16mm diameter through hole that has been drilled, and then install the part with the tapered cutting edge of the tool from the back side of the conductor fixing plate installation into the front end of the special tool handle, and rotate the part with the tapered cutting edge in the opposite direction so that the tapered cutting edge part does not fall off during processing; S5: Processing of reverse tapered hole: The pneumatic right-angle pneumatic tool is pulled upward so that the tapered edge part cuts the 16mm through hole on the conductor fixing plate to the designed taper requirement; S6: Processing of another tapered hole: Repeat steps S4 to S6 to process another tapered hole on the conductor fixing plate.

2. The reverse taper hole processing process for the conductor fixing plate in the inner cavity of a GIS casting according to claim 1 is characterized in that: The tool in S4 comprises a tool head seat, a tool handle and a locking head; The cutter head seat is a rotating body structure with an isosceles trapezoidal longitudinal section, and four cutting edge mounting seats are arranged circumferentially on the cutter head seat, and cutting edges are arranged on the cutting edge mounting seats, the rotation diameter of one end of the cutting edge is 16 mm, and the rotation diameter of the other end of the cutting edge is 18 mm; a connecting hole matching with the tool handle is arranged in the axial direction of the cutter head seat; one end of the tool handle is arranged through the connecting hole on the cutter head seat, and the locking head locks the cutter head seat at the end of the tool handle through threaded cooperation.

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