A tool and method for machining the outer circle of a stationary slender flexible rod

Abstract

The present invention discloses a tool and method for processing the outer circle of a stationary slender flexible rod, and relates to the field of mechanical processing technology. The tool for processing the outer circle of a stationary slender flexible rod includes a clamping device, which has a clamping hole; and a tool assembly, the tool assembly includes a cutting head, a turning tool bar installed on the cutting head, and a plurality of support rods installed on the cutting head, and the cutting head is provided with an inner hole. The slender flexible rod workpiece is clamped by the clamping device, and the tool assembly is installed on the main shaft of a boring machine. The main shaft of the boring machine drives the cutting head to rotate and makes the main shaft of the boring machine move axially, and the turning tool bar on the cutting head is used to turn the workpiece. The present invention can perform outer circle processing on a stationary slender flexible rod workpiece, and there is no need for large tooling to support the workpiece to reduce the disturbance generated when the workpiece rotates as in the previous processing method, thereby reducing the processing cost of the workpiece.

Description

Technical Field

[0001] The invention relates to the technical field of mechanical processing, in particular to a tool for processing the outer circle of a stationary slender flexible rod, and also to a method for processing the outer circle of a stationary slender flexible rod. Background Art

[0002] In the process of realizing the present invention, the inventors found that there are at least the following problems in the prior art. At present, some slender rods are often used in nuclear power high temperature gas-cooled reactor equipment. The aspect ratio of such slender rods is more than 500. The structure is that the middle part is polygonal, the two end journals are circular, and the journal part has matching requirements. In the processing of the journal, if the slender rod workpiece is to be rotated without deformation, only a tool is made to fix the workpiece therein, the tool is supported on the machine tool, the tool is rotated together with the workpiece, the center hole on the end face of the journal processing section of the workpiece is connected to the top of the machine tool, the journal is fixed by the fixing device of the machine tool, and the journal is turned or ground by the machine tool. However, since the length of the workpiece is long, even close to 5 meters, in order to reduce the disturbance generated when the workpiece rotates, the length of the tool is required to be large and the diameter is also large to reduce the disturbance during rotation. In addition to ensuring that the workpiece can be firmly fixed, the outer circle of the tool must be concentric with the outer circle of the workpiece journal; in addition, the length of the machine tool must also meet the length requirements of the workpiece. Thus, the outer circle processing of such slender rods requires the use of special tooling and large processing equipment, and the processing cost is very high. Summary of the invention

[0003] The present invention aims to solve at least one of the above technical problems in the prior art to a certain extent. To this end, an embodiment of the present invention provides a tool for machining the outer circle of a stationary slender flexible rod, which can machine the stationary slender flexible rod workpiece and reduce the machining cost.

[0004] An embodiment of the present invention also provides a method for machining the outer circle of a stationary slender flexible rod.

[0005] According to an embodiment of the first aspect of the present invention, a tool for machining the outer circle of a stationary, slender, flexible rod is provided, comprising a clamping device having a clamping hole; and a tool assembly, wherein the tool assembly comprises a cutting head, a turning tool rod mounted on the cutting head, and a plurality of support rods mounted on the cutting head, wherein the cutting head is provided with an inserted inner hole.

[0006] According to an embodiment of the first aspect of the present invention, the turning tool rod and each of the support rods are located at the opening of the inner hole where the cutting head is inserted, the turning tool rod is installed on the upper end of the cutting head end surface, and the cutting edge of the turning tool rod is arranged radially inward.

[0007] According to an embodiment of the first aspect of the present invention, the turning tool bar and each of the support rods are distributed along the end circumference of the cutting head, the radial position of the turning tool bar on the cutting head is adjustable, and the radial position of each of the support rods on the cutting head is adjustable.

[0008] According to an embodiment of the first aspect of the present invention, a clamping assembly is installed in the inner hole of the cutting head, and the clamping assembly includes a spring support, a top and a clamping spring arranged between the spring support and the top, and the spring support is fixed on the cutting head.

[0009] According to an embodiment of the first aspect of the present invention, a sleeve is connected to the bottom of the top point, and the sleeve can slide in the inserted inner hole. One end of the compression spring is installed on the spring support, and the other end of the compression spring is inserted into the sleeve and connected to the bottom of the top point.

[0010] According to an embodiment of the first aspect of the present invention, the cutting head is equipped with a locking screw, the sleeve is provided with an axially arranged limiting groove, and the locking screw passes through the side wall of the cutting head and is placed in the limiting groove of the sleeve.

[0011] According to an embodiment of the first aspect of the present invention, the cutting head is also connected to a tool handle, one end of the tool handle is fixed to the spindle of the boring machine by a rivet, and the other end of the tool handle is provided with a mounting hole for inserting the cutting head, and the tool handle is installed with at least one positioning and fastening screw, which passes through the side wall of the tool handle and presses against the cutting head located in the mounting hole.

[0012] According to an embodiment of the first aspect of the present invention, the clamping device includes a bracket and a clamping assembly installed on the bracket, the clamping assembly includes a lower clamping seat and an upper clamping seat installed in an upper and lower manner, the lower clamping seat is fixed on the bracket, the clamping hole includes two semicircular grooves respectively arranged on the lower clamping seat and the upper clamping seat, and the upper clamping seat is installed with a plurality of clamping bolts.

[0013] According to an embodiment of the second aspect of the present invention, a method for machining the outer circle of a stationary slender flexible rod is provided, using the tool for machining the outer circle of a stationary slender flexible rod described in the embodiment of the first aspect of the present invention, comprising the following steps: S1, installing the tool assembly on the spindle of a boring machine, adjusting the radial positions of the turning tool bar on the cutting head and each supporting rod to meet the requirements of the diameter of the turning workpiece; installing the workpiece on a clamping device; S2, starting the boring machine, the boring machine spindle drives the cutting head to rotate, and the boring machine spindle moves axially, and the workpiece is turned with the turning tool bar on the cutting head until the predetermined processing length is reached, then the feeding is stopped, and the cutting head is gradually withdrawn from the workpiece.

[0014] According to an embodiment of the second aspect of the present invention, it also includes, before step S2, pre-machining a center hole on the end face of the workpiece, and using the center hole as the support center of the workpiece; after clamping the workpiece, aligning the outer circle and the side generatrix of the workpiece, making the center line of the boring machine spindle coaxial with the center line of the workpiece, moving the boring machine spindle so that the center point contacts the center hole of the workpiece, and allowing the workpiece to gradually approach the turning tool rod so that the clamping spring is subjected to a preload.

[0015] The embodiments of the present invention have at least the following beneficial effects: the slender flexible rod workpiece is clamped by a clamping device, the tool assembly is installed on the boring machine spindle, the boring machine spindle drives the cutting head to rotate, and the boring machine spindle moves axially, and the workpiece is turned by the turning tool bar on the cutting head. During the axial movement of the boring machine spindle, the cutting head is provided with an insertion inner hole for inserting the workpiece. In the present invention, after the cutting head is driven by the boring machine spindle, the stationary slender flexible rod workpiece can be processed externally, without the need for large tooling to support the workpiece to reduce the disturbance generated when the workpiece rotates, as in the previous processing method, and the processing cost of the workpiece can be reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly describes the drawings required for use in the description of the embodiments. Obviously, the drawings described are only part of the embodiments of the present invention, not all of the embodiments, and those skilled in the art can also obtain other design solutions and drawings based on these drawings without creative work.

[0017] Figure 1 is a schematic structural diagram of an embodiment of the present invention;

[0018] Figure 2 is a schematic diagram of the structure during the processing of an embodiment of the present invention;

[0019] Figure 3 yes Figure 1 Sectional view along AA direction;

[0020] Figure 4 yes Figure 1 Cross-sectional view along the BB axis. DETAILED DESCRIPTION

[0021] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and the overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the description of orientation, such as the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present invention. In addition, if there is a description of "first" or "second", it is only used for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0023] In the description of the present invention, "several" means one or more, "multiple" means two or more, "greater than", "less than", "exceed" etc. are understood to not include the number, and "above", "below", "within" etc. are understood to include the number, unless otherwise clearly and specifically defined.

[0024] In the description of the present invention, unless otherwise clearly defined, words such as “set,” “arrange,” “install,” “connect,” “connected,” and “fixed” should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above words in the present invention based on the specific content of the technical solution.

[0025] In the description of the present invention, unless otherwise clearly defined, a first feature being "above" or "below" a second feature may mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Moreover, a first feature being "above" or "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below" or "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] Reference Figures 1 to 4 A tool for machining the outer circle of a stationary, slender, flexible rod comprises a clamping device and a tool assembly.

[0027] The clamping device is used to clamp the workpiece 1. In this embodiment, the workpiece 1 is a slender flexible rod. Specifically, the clamping device has a clamping hole, such as Figure 3As shown, the clamping device includes a bracket and a clamping assembly 3 installed on the bracket, the clamping assembly 3 includes a lower clamping seat and an upper clamping seat installed in cooperation with each other, the lower clamping seat is fixed on the bracket, and the clamping hole includes two semicircular grooves arranged on the lower clamping seat and the upper clamping seat respectively, that is, the workpiece 1 is clamped by the lower clamping seat and the upper clamping seat. In addition, the upper clamping seat is installed with a plurality of clamping bolts 2, that is, the upper clamping seat is tightened by each clamping bolt 2 to clamp the lower clamping seat, thereby clamping the workpiece 1 and keeping the workpiece 1 stationary.

[0028] The tool assembly includes a cutting head 7, a turning tool bar 6 mounted on the cutting head 7, and a plurality of support rods 4 mounted on the cutting head 7. In this embodiment, the turning tool bar 6 and each support rod 4 are located at the opening of the inner hole where the cutting head 7 is inserted, and the turning tool bar 6 is mounted on the upper end of the end surface of the cutting head 7, and the blade of the turning tool bar 6 is arranged radially inward. Figure 4 The turning tool bar 6 and each support rod 4 are distributed along the circumference of the end of the cutting head 7. The radial position of the turning tool bar 6 on the cutting head 7 is adjustable, and the radial position of each support rod 4 on the cutting head 7 is adjustable. In this embodiment, specifically, four radially distributed rod insertion grooves are opened at the end of the cutting head 7, three of which are inserted into the support rods 4, and the other is inserted into the turning tool bar 6. The blade of the turning tool bar 6 faces radially inward, and the workpiece 1 can be processed. And each rod insertion groove is installed with a tool holder screw 5 for fixing the turning tool bar 6 or each support rod 4.

[0029] In addition, the cutting head 7 is provided with an inner hole, such as Figure 2 As shown, when the cutting head 7 processes the workpiece 1, the workpiece needs to penetrate into the inserted inner hole. Among them, the inserted inner hole of the cutting head 7 is installed with a clamping assembly, and the clamping assembly includes a spring support 15, a top 8 and a compression spring 10 arranged between the spring support 15 and the top 8, and the spring support 15 is fixed on the cutting head 7. Preferably, a sleeve 18 is connected to the bottom of the top 8, and the bottom of the top 8 refers to the side of the top 8 connected to the compression spring 10, and the sleeve 18 can slide in the inserted inner hole, and one end of the compression spring 10 is installed on the spring support 15, and the other end of the compression spring 10 is inserted into the sleeve 18 and connected to the bottom of the top 8. The cutting head 7 is installed with a tightening screw 9, and the sleeve 18 is provided with an axially arranged limit groove. The tightening screw 9 passes through the side wall of the cutting head 7 and is inserted into the limit groove of the sleeve 18. It can be understood that, referring to Figure 1 and Figure 2 The length of the limit groove can control the moving distance of the sleeve 18, and when the top screw 9 is inserted into the limit groove of the sleeve 18, the sleeve 18 can be limited to rotate. In this embodiment, the clamping assembly in the cutting head 7 can apply pressure to the end of the workpiece 1, and the winding deformation of the workpiece 1 can be reduced during the processing of the workpiece 1.

[0030] The cutting head 7 is also connected to a tool handle 11, one end of which is fixed to the boring machine spindle 17 by a rivet 16, and the other end of the tool handle 11 is provided with a mounting hole for inserting the cutting head 7, and the tool handle 11 is provided with at least one positioning and fastening screw 12, which passes through the side wall of the tool handle 11 and presses against the cutting head 7 located in the mounting hole. In this way, the tool handle 11 can be first installed on the boring machine spindle 17, the clamping assembly can be installed in the cutting head 7, and then the cutting head 7 can be placed in the mounting hole of the tool handle 11 and fastened with the positioning and fastening screw 12.

[0031] In addition, the tool for machining the outer circle of a stationary slender flexible rod of this embodiment also includes a cooling device, which is used to cool the tool, specifically to provide coolant, and the cooling device includes a coolant channel, the coolant channel flows through the inner hole of the pull nail 16 to the spring support 15, and enters the inner hole of the top 8 through the inner hole of the spring support 15, and finally sprays out from the supporting surface of the top 8 to cool and lubricate the cutting part of the turning tool rod 6. In order to ensure that the coolant can flow into the gap between the top 8 and the cutting head 7, a first O-ring 13 is provided between the sleeve 18 and the cutting head 7, and a second O-ring 14 is provided between the cutting head 7 and the tool handle 11.

[0032] This embodiment also shows a method for machining the outer circle of a stationary slender flexible rod, using the tool for machining the outer circle of the stationary slender flexible rod, comprising the following steps:

[0033] S1, install the tool assembly on the boring machine spindle 17, and use the tool setting instrument to adjust the radial position of the turning tool bar 6 and each support rod 4 on the cutting head 7 according to the diameter of the workpiece 1 to be processed, and tighten the tool holder screw 5 so that the turning tool bar 6 and the support rod meet the requirements of the diameter of the turning workpiece 1.

[0034] A center hole is pre-machined on the end face of the workpiece 1 and the center hole is used as the support center of the workpiece 1. The workpiece 1 is then mounted on the clamping device.

[0035] The above-mentioned installation of the tool assembly and clamping of the workpiece can be carried out simultaneously or one after the other.

[0036] After completing the above two operations, attach the dial indicator to the boring machine spindle 17, move and rotate the boring machine spindle 17 to align the outer circle and the side generatrix of the workpiece 1, and make the center line of the boring machine spindle 17 coaxial with the center line of the workpiece 1; move the boring machine spindle 17 so that the center point 8 contacts the center hole of the workpiece 1, and let the workpiece 1 gradually approach the turning tool arbor 6, so that the clamping spring 10 is subjected to a certain preload force, and stop moving when the workpiece 1 is 2-3mm away from the turning tool arbor.

[0037] S2, start the boring machine, the boring machine spindle 17 drives the cutting head 7 to rotate, and makes the boring machine spindle 17 move axially, and uses the turning tool bar 6 on the cutting head 7 to turn the workpiece 1 until it reaches the predetermined processing length. Figure 2 During the feeding process of the boring machine spindle 17, the compression spring 10 is compressed, and then the feeding is stopped, and the cutting head 7 is gradually withdrawn from the workpiece 1.

[0038] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments. Various changes can be made within the knowledge scope of ordinary technicians in the technical field without departing from the purpose of the present invention.

Claims

1. A tool for machining the outer circle of a stationary, slender, flexible rod, characterized in that: include A clamping device having a clamping hole, the clamping device being used to clamp the slender flexible rod to keep the slender flexible rod stationary; and A tool assembly, the tool assembly comprising a cutting head (7), a turning tool bar (6) mounted on the cutting head (7), and a plurality of support bars (4) mounted on the cutting head (7), the cutting head (7) being provided with an insertion inner hole; The turning tool bar (6) and each of the support bars (4) are located at the opening of the inner hole where the cutting head (7) is inserted, the turning tool bar (6) is installed at the upper end of the end surface of the cutting head (7), and the cutting edge of the turning tool bar (6) is arranged radially inward; The turning tool bar (6) and each of the support bars (4) are distributed along the circumference of the end of the cutting head (7); the radial position of the turning tool bar (6) on the cutting head (7) is adjustable, and the radial position of each of the support bars (4) on the cutting head (7) is adjustable; A clamping assembly is installed in the insertion inner hole of the cutting head (7), and the clamping assembly is used to apply pressure to the end of the slender flexible rod. The clamping assembly comprises a spring support (15), a top (8), and a clamping spring (10) arranged between the spring support (15) and the top (8), and the spring support (15) is fixed on the cutting head (7).

2. The tool for machining the outer circle of a stationary, slender, flexible rod according to claim 1, characterized in that: A sleeve (18) is connected to the bottom of the tip (8), and the sleeve (18) can slide in the insertion inner hole. One end of the compression spring (10) is installed on the spring support (15), and the other end of the compression spring (10) is inserted into the sleeve (18) and connected to the bottom of the tip (8).

3. The tool for machining the outer circle of a stationary, slender, flexible rod according to claim 2, characterized in that: The cutting head (7) is provided with a locking screw (9), the sleeve (18) is provided with an axially arranged limiting groove, and the locking screw (9) passes through the side wall of the cutting head (7) and is placed in the limiting groove of the sleeve (18).

4. The tool for machining the outer circle of a stationary, slender, flexible rod according to claim 1, characterized in that: The cutting head (7) is also connected to a tool handle (11), one end of the tool handle (11) is fixed to the boring machine spindle (17) via a rivet (16), the other end of the tool handle (11) is provided with a mounting hole for inserting the cutting head (7), the tool handle (11) is provided with at least one positioning fastening screw (12), the positioning fastening screw (12) passes through a side wall of the tool handle (11) and presses against the cutting head (7) located in the mounting hole.

5. The tool for machining the outer circle of a stationary, slender, flexible rod according to any one of claims 1 to 4, characterized in that: The clamping device comprises a bracket and a clamping assembly (3) mounted on the bracket, the clamping assembly (3) comprising a lower clamping seat and an upper clamping seat mounted in cooperation with each other, the lower clamping seat being fixed on the bracket, the clamping hole comprising two semicircular grooves respectively arranged on the lower clamping seat and the upper clamping seat, and the upper clamping seat being mounted with a plurality of clamping bolts (2).

6. A method for machining the outer circle of a stationary slender flexible rod, characterized in that: The use of the tool for machining the outer circle of a stationary slender flexible rod according to any one of claims 1 to 4 comprises the following steps: S1, installing the tool assembly on the boring machine spindle (17), adjusting the radial positions of the turning tool bar (6) and each support rod (4) on the cutting head (7) to meet the diameter requirement of the turning workpiece (1); installing the workpiece (1) on the clamping device; S2, the boring machine is started, the boring machine spindle (17) drives the cutting head (7) to rotate, and the boring machine spindle (17) is moved axially, and the turning tool bar (6) on the cutting head (7) is used to turn the workpiece (1) until the predetermined processing length is reached, and then the feeding is stopped, and the cutting head (7) is gradually withdrawn from the workpiece (1).

7. The method for machining the outer circle of a stationary slender flexible rod according to claim 6, characterized in that: Also includes: Before step S2, a center hole is pre-machined on the end face of the workpiece (1), and the center hole is used as the support center of the workpiece (1); after the workpiece (1) is clamped, the outer circle and the side generatrix of the workpiece (1) are aligned, so that the center line of the boring machine spindle (17) is coaxial with the center line of the workpiece (1), the boring machine spindle (17) is moved so that the center point (8) contacts the center hole of the workpiece (1), and the workpiece (1) is gradually moved close to the turning tool rod (6) so that the compression spring (10) is subjected to a preload.

Images