A fixing tool for flame tube machining

Abstract

The application belongs to the technical field of workpiece clamping equipment, and provides a fixed tool for flame tube machining, which comprises: a mounting seat, which is used for fixedly connecting the tool on a lathe or a milling machine; a small-end expansion mechanism, which is connected with the mounting seat and is used for expanding the small-end straight cylinder of the flame tube in an inner support fixed mode; and a large-end expansion mechanism, which is transmissionally connected with the small-end expansion mechanism and is used for expanding the large-end straight cylinder of the flame tube in an inner support fixed mode; wherein after the small-end expansion mechanism expands the small-end straight cylinder of the flame tube, the end of the large-end expansion mechanism, which is far away from the small-end expansion mechanism, is locked with the mounting seat. The turning and milling machining operations can be completed after the flame tube is clamped once by the small-end expansion mechanism and the large-end expansion mechanism, the cross-process sharing of a single tool is realized, the tool manufacturing cost is reduced, the machining process flow is optimized, the machining efficiency is improved, and the product quality is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of workpiece clamping equipment, in particular to a fixing tool for flame tube machining. BACKGROUND

[0002] The flame tube is a core component of the combustion chamber of an aerojet engine and an industrial gas turbine. Figure 9 As shown in the figure, the flame tube has a large straight cylinder at one end and a small straight cylinder at the other end, and a conical cylinder in the middle. It is a thin-walled (wall thickness 3mm) formed and welded high-temperature alloy part. Specifically, the small end of the straight cylinder is evenly distributed with several axially extending cooling grooves, the middle conical cylinder is distributed with spiral reinforcing ribs and spark plug sleeve holes perpendicular to the cylinder body, and the large end of the straight cylinder is evenly distributed with two circles of air film cooling holes and has multiple hanging positioning mounting blocks on the outer circle.

[0003] Currently, the machining of the flame tube mainly adopts a machining route with the large end downward and the small end upward, and the machining fixing tool has the following two types:

[0004] 1. The whole type of membrane tooling, which is pressed into the tooling by a hydraulic machine for machining, and the process flow is divided into 5 processes, which has the disadvantages of heavy tooling, high tooling manufacturing cost, multiple types of equipment used in machining, troublesome disassembly of the flame tube, low safety in the process of transportation and operation, and surface scratching of the flame tube.

[0005] 2. The inner support type tooling, which uses the fixing method of expanding the two ends and supporting the middle in the turning process, and has the disadvantages of time-consuming alignment and low machining efficiency; in other machining processes, such as milling cooling grooves, spiral reinforcing ribs, spark plug sleeve holes, positioning and mounting blocks, and drilling air film cooling holes, the process is divided into 3 processes, 3 sets of tooling are needed, and the disadvantages include high manufacturing cost of multiple toolings, multiple types of equipment used in machining, and low machining efficiency. SUMMARY

[0006] In view of the shortcomings of the prior art, the present application provides a fixing tool for flame tube machining to solve the problems of high manufacturing cost of the existing two fixing toolings, multiple types of equipment used in machining, complex machining process flow (many processes), inconvenient disassembly of the flame tube, low product quality, and low machining efficiency.

[0007] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0008] A fixing tool for flame tube machining, comprising:

[0009] A mounting seat for fixedly connecting the tool to a lathe or a milling machine;

[0010] a small-end expanding mechanism connected with the mounting base for expanding the small-end straight cylinder of the flame tube in an inner supporting and fixed manner; and

[0011] a large-end expanding mechanism in transmission connection with the small-end expanding mechanism for expanding the large-end straight cylinder of the flame tube in an inner supporting and fixed manner.

[0012] Wherein, after the small-end expanding mechanism expands the small-end straight cylinder of the flame tube, the end of the large-end expanding mechanism away from the small-end expanding mechanism is locked with the mounting base.

[0013] In one embodiment of the present disclosure, the mounting base comprises a disc body and a core shaft with a T-shaped longitudinal section, the disc body is fixedly connected with a lathe or a milling machine, and the head of the core shaft is fixedly connected with a sunken area in the middle of the end of the disc body away from the lathe or the milling machine to fill the sunken area;

[0014] The small-end expanding mechanism comprises an expanding sleeve and a plurality of first expanding blocks circumferentially distributed on the outside of the expanding sleeve, the expanding sleeve is in screw connection with the rod part of the core shaft, and the taper surface is matched between the end of the expanding sleeve and each first expanding block, each first expanding block is connected with the end of the disc body away from the lathe or the milling machine and can slide along the radial direction of the disc body to expand the small-end straight cylinder of the flame tube;

[0015] The large-end expanding mechanism comprises an adjusting cylinder, a supporting block, an adjusting rod and a second expanding block arranged in sequence, the adjusting cylinder is in clamping connection with the other end of the expanding sleeve to ensure that the two can synchronously rotate around the core shaft, the supporting block is fixedly connected with the other end of the adjusting cylinder and is circumferentially distributed with a plurality of supporting blocks around the axis of the adjusting cylinder, the second expanding block is connected with each supporting block in one-to-one form through the adjusting rod and can slide along the radial direction of the adjusting cylinder to expand the large-end straight cylinder of the flame tube;

[0016] The rod part of the core shaft is in screw connection with a double-headed screw rod after the end thereof away from the head penetrates through the expanding sleeve, the end of the double-headed screw rod away from the core shaft penetrates through the adjusting cylinder and is locked through the nut in screw connection therewith after the small-end straight cylinder of the flame tube is expanded.

[0017] In one embodiment of the present disclosure, the end of the expanding sleeve is provided with a first taper surface;

[0018] Each first expanding block has an inner concave side and an outer convex side to present a fan-shaped cross section, and the inner concave side is provided with a second taper surface;

[0019] The first taper surface is in sliding connection with the second taper surface.

[0020] In one embodiment of the present disclosure, a plurality of parallel waist-shaped holes are formed in each first expanding block.

[0021] Each of the waist-shaped holes is provided with a screw whose axis is parallel to the axis of the mandrel;

[0022] The screw is threadedly connected to the end of the disc body away from the lathe or milling machine.

[0023] In one embodiment of the present disclosure, the small-end expanding mechanism further comprises a disc sleeve for axial positioning of the flame tube;

[0024] The disc sleeve is mainly composed of a plurality of arc-shaped members with L-shaped structure in longitudinal section, which are arranged outside the end of the disc body away from the lathe or milling machine;

[0025] One end of each of the arc-shaped members is fixedly connected to the disc body by a pair of screws, and the other end is flush with the end of the disc body away from the lathe or milling machine to abut against the straight cylindrical end surface of the small end of the flame tube.

[0026] The outer diameter of the other end of each of the arc-shaped members is greater than the inner diameter of the straight cylinder of the small end of the flame tube and less than the outer diameter of the straight cylinder of the small end of the flame tube.

[0027] In one embodiment of the present disclosure, the adjusting cylinder comprises a sleeve and a disc, a plurality of clamping blocks are connected to the inner side wall of the sleeve at one end, and the plurality of clamping blocks are inserted into the plurality of clamping grooves provided at the other end of the expanding sleeve in one-to-one form along the axial direction of the sleeve to form a spline connection structure.

[0028] The disc is fixedly connected to the other end of the sleeve to seal the end, and a hole six-block is connected to the middle of the disc, which is in communication with the inside of the sleeve to allow the end of the double-headed screw rod away from the mandrel to freely pass out of the sleeve.

[0029] After the small-end straight cylinder of the flame tube is expanded, the nut sleeve is on the double-headed screw rod and abuts against the hole six-block to lock the adjusting cylinder.

[0030] In one embodiment of the present disclosure, a solid six-block is provided on the double-headed screw rod.

[0031] The end of the double-headed screw rod threadedly connected to the mandrel is provided with a lock nut, and the lock nut abuts against the end of the rod part of the mandrel away from the head part.

[0032] In one embodiment of the present disclosure, each of the supporting blocks has an L-shaped structure in longitudinal section, and is fixedly connected to the disc by a pair of screws, and a supporting plate is provided in the middle of one side of each of the supporting blocks away from the disc.

[0033] The adjusting rod is threadedly passed through the supporting plate, and the second expanding block is hingedly connected to the adjusting rod and slidingly matched with one side of the supporting block away from the disc.

[0034] In one embodiment of the present disclosure, the second expansion block is provided with a large and small chip removal groove on the side that is in contact with the inner side wall of the large-end straight cylinder of the flame tube;

[0035] The chip removal groove extends along the circumference of the disc to accommodate the corresponding tool head and generated iron chips when drilling the large-end straight cylinder of the flame tube.

[0036] In one embodiment of the present disclosure, an L-shaped sleeve is further included for sleeving on the hole-containing hexagonal block to rotate the adjusting cylinder.

[0037] Compared with the prior art, the present application has the following beneficial effects:

[0038] 1. The small-end expansion mechanism and the large-end expansion mechanism can complete the turning and milling work after the flame tube is clamped once, realize the cross-process sharing of a single set of tooling, reduce the tooling manufacturing cost, optimize the machining process, and improve the machining efficiency while ensuring the product quality.

[0039] 2. The second expansion block can be slightly deflected on the side away from the disc around the hinge point with the adjusting rod, which can improve the contact degree (increase the contact area) with the inner side wall of the large-end straight cylinder of the flame tube, thereby improving the coaxiality of the large end and the small end of the flame tube after being clamped and fixed (fine-tuning the inclination of the large end and the small end of the flame tube), which can further ensure the product quality. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiment or prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1 It is a schematic diagram of the three-dimensional structure of the present application;

[0042] Figure 2 It is a schematic diagram of the main cross-sectional structure of the present application;

[0043] Figure 3 It is a schematic diagram of the three-dimensional structure of the small-end expansion mechanism (located in the lower part, with hidden parts) and the mounting seat; Figure 1

[0044] Figure 4 It is a schematic diagram of the three-dimensional structure of the large-end expansion mechanism (located in the upper part, Figure 1 Figure 1

[0045] Figure 5 ​​​Schematic diagram of the three-dimensional structure of the expansion sleeve Figure 1 ;

[0046] Figure 6 Schematic diagram of the three-dimensional structure of the expansion sleeve Figure 2 ;

[0047] Figure 7 Schematic diagram of the three-dimensional structure of the regulating cylinder Figure 1 ;

[0048] Figure 8 Schematic diagram of the three-dimensional structure of the regulating cylinder Figure 2 ;

[0049] Figure 9 This is a three-dimensional structural diagram of a certain type of flame tube.

[0050] The annotations in the attached figures are explained as follows:

[0051] 100. Mounting base; 110. Disc body; 120. Spindle; 130. Double-ended screw; 131. Solid hexagonal block; 140. Nut; 150. Lock nut.

[0052] 200. Small end tensioning mechanism; 210. Tensioning sleeve; 211. First conical surface; 212. Slot; 220. First tensioning block; 221. Second conical surface; 222. Waist-shaped hole; 230. Disc sleeve; 231. Arc-shaped component.

[0053] 300. Large end tensioning mechanism; 310. Adjusting cylinder; 311. Sleeve; 312. Disc; 313. Locking block; 314. Hexagonal block with hole; 315. Weight reduction hole; 320. Support block; 321. Support plate; 330. Adjusting rod; 340. Second tensioning block; 341. Chip removal groove.

[0054] 400, L-shaped sleeve. Detailed Implementation

[0055] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0056] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0057] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0058] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal communication of two elements or the interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0059] In the present application, unless otherwise explicitly specified and limited, the "upper" or "lower" of the first feature to the second feature can include the direct contact of the first and second features, or the contact of the first and second features through another feature between them. Moreover, the "upper", "above" and "above" of the first feature to the second feature include the vertical direction of the first feature above and oblique above the second feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The "below", "below" and "below" of the first feature to the second feature include the vertical direction of the first feature below and oblique below the second feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0060] The following disclosure provides many different embodiments or examples for implementing different structures of the present application. In order to simplify the disclosure of the present application, the components and arrangements of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0061] The embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0062] Reference Figures 1-8As shown, the present application provides a fixing tool for flame tube processing, comprising:

[0063] A mounting base 100 is used to fix and connect the tool on a lathe or milling machine (not shown in the figure);

[0064] A small-end expanding mechanism 200 is connected with the mounting base 100, and is used to expand the small-end straight cylinder of the flame tube in an inner support fixing mode; and

[0065] A large-end expanding mechanism 300 is transmissionally connected with the small-end expanding mechanism 200, and is used to expand the large-end straight cylinder of the flame tube in an inner support fixing mode.

[0066] After the small-end expanding mechanism 200 expands the small-end straight cylinder of the flame tube, the end of the large-end expanding mechanism 300 away from the small-end expanding mechanism 200 is locked with the mounting base 100.

[0067] Specifically, the mounting seat 100 comprises a disc body 110 fixedly connected with a lathe or a milling machine and a core shaft 120 with a T-shaped longitudinal section, a head of the core shaft 120 is fixedly connected to a sunken area in the middle of an end of the disc body 110 away from the lathe or the milling machine to fill the sunken area; the small-end expanding mechanism 200 comprises an expanding sleeve 210 and a plurality of first expanding blocks 220 circumferentially and evenly distributed outside the expanding sleeve 210, the expanding sleeve 210 is threadedly connected with a rod part of the core shaft 120 and a conical surface between one end of the expanding sleeve 210 and each first expanding block 220, each first expanding block 220 is connected with an end of the disc body 110 away from the lathe or the milling machine and can slide along the disc body 110 in a radial direction to expand a small-end straight cylinder of the flame tube; the large-end expanding mechanism 300 comprises an adjusting cylinder 310, a support block 320, an adjusting rod 330 and a second expanding block 340 arranged in sequence, one end of the adjusting cylinder 310 is clampedly connected with the other end of the expanding sleeve 210 to ensure that the two can synchronously rotate around the core shaft 120, the support block 320 is fixedly connected with the other end of the adjusting cylinder 310 and is circumferentially and evenly distributed around an axis of the adjusting cylinder 310, the second expanding block 340 is connected with each support block 320 in a one-to-one form through the adjusting rod 330 and can slide along the adjusting cylinder 310 in a radial direction to expand a large-end straight cylinder of the flame tube; a rod part of the core shaft 120 is threadedly connected with a double-headed screw rod 130 after an end of the rod part away from the head of the core shaft 120 penetrates through the expanding sleeve 210, the double-headed screw rod 130 penetrates through the adjusting cylinder 310 from an end of the double-headed screw rod 130 away from the core shaft 120 and is locked with the adjusting cylinder 310 through a nut 140 threadedly connected with the double-headed screw rod 130 after the small-end straight cylinder of the flame tube is expanded (i.e. the above-mentioned "the end of the large-end expanding mechanism 300 away from the small-end expanding mechanism 200 is locked with the mounting seat 100"). Rotating the adjusting cylinder 310 around the double-headed screw rod 130 drives the expanding sleeve 210 to spirally rotate on the core shaft 120 while moving along the core shaft 120 in an axial direction, pushes the plurality of first expanding blocks 220 to simultaneously slide along the disc body 110 in a radial direction at an end of the disc body 110 away from the lathe or the milling machine, thereby adhering to an inner side wall of the small-end straight cylinder of the flame tube to expand the small-end straight cylinder, at this time, the nut 140 is screwed on the end of the double-headed screw rod 130 away from the core shaft 120 to press on the adjusting cylinder 310 to lock the adjusting cylinder 310, then the adjusting rod 330 is rotated to slide the second expanding block 340 along the adjusting cylinder 310 in a radial direction to make the second expanding block 340 adhere to an inner side wall of the large-end straight cylinder of the flame tube to expand the large-end straight cylinder; after both ends of the flame tube are expanded, the disc body 110 is fixedly installed on the lathe or the milling machine to complete turning and milling machining of the flame tube under the premise of one-time clamping and realize cross-process sharing of a single set of tooling. It has been verified that, after the tooling is adopted, a machining process flow of the flame tube can be optimized to two processes of horizontal turning and vertical milling. That is to say, turning and milling operations can be completed after the small-end expanding mechanism 200 and the large-end expanding mechanism 300 clamp the flame tube once, cross-process sharing of a single set of tooling is realized, tooling manufacturing cost is reduced, a machining process flow is optimized, and machining efficiency can be improved while ensuring product quality.

[0068] In order to facilitate the screwing of the double-headed screw 130 into the rod part of the mandrel 120 away from the head thereof, the double-headed screw 130 is provided with a solid hexagonal block 131, and the double-headed screw 130 can be rotated by clamping the solid hexagonal block 131 with a wrench to realize the dismounting thereof; meanwhile, in order to prevent the double-headed screw 130 screwed into the mandrel 120 from loosening, the end of the double-headed screw 130 screwed into the mandrel 120 is threadedly connected with a lock nut 150, and the lock nut 150 abuts against the end of the rod part of the mandrel 120 away from the head thereof.

[0069] Referring to Figure 5 and Figure 6 As shown in the drawings, the expansion sleeve 210 is provided with a first taper surface 211 at one end thereof; each first expansion block 220 has an inner concave side and an outer convex side to present a fan-shaped cross section, and the inner concave side is provided with a second taper surface 221; the first taper surface 211 and the second taper surface 221 are in sliding fit. In this way, when the expansion sleeve 210 is rotated on the mandrel 120 to move axially along the mandrel 120, the first taper surface 211 can push the second taper surface 221, so that the first expansion block 220 slides radially along the disc body 110.

[0070] A plurality of parallel waist-shaped holes 222 are formed in each first expansion block 220, and a screw with an axis parallel to the mandrel 120 is installed in each waist-shaped hole 222, and the screw is threadedly connected with the end of the disc body 110 away from the lathe or milling machine. After the head of the mandrel 120 fills the sunken area of the disc body 110, a part of each first expansion block 220 contacts the head of the mandrel 120, and another part contacts the disc body 110; when the expansion sleeve 210 is rotated on the mandrel 120 to move axially along the mandrel 120, the first expansion block 220 can be pushed to slide radially outward along the disc body 110 under the support of the head of the mandrel 120 and the disc body 110 by the mutual sliding between the first taper surface 211 and the second taper surface 221, so as to be attached to the inner side wall of the small-end straight cylinder of the flame tube, and then the small-end straight cylinder is expanded.

[0071] Referring to Figures 1-3 As shown in the drawings, the small-end expansion mechanism 200 further comprises a disc sleeve 230 for axial positioning of the flame tube, and the disc sleeve 230 is mainly composed of a plurality of arc-shaped members 231 with an L-shaped structure in longitudinal section, which are surrounded outside the end of the disc body 110 away from the lathe or milling machine; one end of each arc-shaped member 231 is fixedly connected with the disc body 110 by a pair of screws, and the other end is flush with the end of the disc body 110 away from the lathe or milling machine to abut against the small-end straight cylinder end face of the flame tube, and the outer diameter of the other end of each arc-shaped member 231 is greater than the inner diameter of the small-end straight cylinder of the flame tube and less than the outer diameter of the small-end straight cylinder of the flame tube. In this way, before the small-end straight cylinder of the flame tube is expanded, the disc sleeve 230 surrounded by the plurality of arc-shaped members 231 can first abut against the flame tube to realize the axial positioning thereof, and the size thereof does not affect the machining of the cooling grooves on the outer circumferential surface of the small-end straight cylinder after the flame tube is expanded.

[0072] Referring toFigure 7 and Figure 8 As shown, the adjusting cylinder 310 includes a sleeve 311 and a disc 312. Multiple circumferentially distributed locking blocks 313 are connected to the inner circumference of one end of the sleeve 311. The multiple locking blocks 313 are inserted into multiple slots 212 provided at the other end of the expansion sleeve 210 in a one-to-one manner along the axial direction of the sleeve 311 to form a spline connection structure. The disc 312 is fixedly connected (e.g., welded) to the other end of the sleeve 311 to seal that end. A perforated hexagonal block 314 is connected to the middle of the disc 312. The perforated hexagonal block 314 communicates with the inside of the sleeve 311 so that the end of the double-ended screw 130 away from the spindle 120 can freely pass through the sleeve 311. After the straight cylinder at the small end of the flame tube is expanded, the nut 140 is sleeved on the double-ended screw 130 and abuts against the perforated hexagonal block 314 to lock the adjusting cylinder 310. The adjustment cylinder 310 and the expansion sleeve 210 are connected by inserting the locking block 313 into the locking slot 212. When the entire adjustment cylinder 310 is rotated by rotating the disc 312 through the perforated hexagonal block 314, the expansion sleeve 210 is driven to rotate spirally on the spindle 120 and move axially along the spindle 120.

[0073] To facilitate the rotation of the adjusting cylinder 310 and reduce the weight of this tooling, several weight-reducing holes 315 are provided on the sleeve 311.

[0074] See Figure 4 As shown, each support block 320 has an L-shaped longitudinal section and is fixedly connected to the disc 312 by a pair of screws. Each support block 320 has a support plate 321 in the middle of the side away from the disc 312. The adjusting rod 330 is threaded through the support plate 321. The second tensioning block 340 is hinged to the adjusting rod 330 and slides with the side of the support block 320 away from the disc 312. Thus, rotating the adjusting rod 330 can push the second tensioning block 340 to slide on the side of the support block 320 away from the disc 312, thereby fitting against the inner circumference of the straight cylinder at the large end of the flame tube and tightening it. At the same time, the second tensioning block 340 can slightly deflect around its hinge point with the adjusting rod 330 on the side of the support block 320 away from the disc 312, thereby increasing its fit with the inner circumference of the straight cylinder at the large end of the flame tube (increasing the fitting area), improving the coaxiality of the large and small ends of the flame tube after it is clamped and fixed (fine-tuning the tilt of the large and small ends of the flame tube), and further ensuring the quality of the finished product.

[0075] The second expansion block 340 has a chip removal groove 341 of different sizes on the side that is in contact with the inner circumference of the straight cylinder at the large end of the flame tube. The chip removal groove 341 extends along the circumference of the disc 312 to accommodate the corresponding cutting head and the generated iron chips when drilling the straight cylinder at the large end of the flame tube.

[0076] The fixing tool for processing the flame tube further comprises an L-shaped sleeve 400 for sleeving on the six-hole block 314 to rotate and adjust the adjusting tube 310. In this way, the adjusting tube 310 is more labor-saving. After the small-end straight tube of the flame tube is expanded, the L-shaped sleeve 400 is removed to avoid affecting the expansion of the large-end straight tube of the flame tube and the subsequent processing of the flame tube. Then, the nut 140 is screwed on the end of the double-end screw 130 away from the mandrel 120 to press on the six-hole block 314 to lock the adjusting tube 310.

[0077] In the embodiment, the clamping grooves 212 and the clamping blocks 313 are circumferentially and evenly distributed with 6 respectively; the first expanding blocks 220 are circumferentially and evenly distributed with 4; each first expanding block 220 is provided with 3 parallel waist-shaped holes 222; the disc sleeve 230 is mainly composed of 3 arc-shaped members 231; the supporting blocks 320, the adjusting rods 330 and the second expanding blocks 340 are circumferentially and evenly distributed with 6 respectively.

[0078] The above embodiments are only the preferred embodiments of the present application, and are not the limitation of the technical solutions of the present application. Any technical solution which can be realized on the basis of the above embodiments without creative labor shall be deemed to fall within the protection scope of the present application.

Claims

1. A fixing tool for flame tube processing, characterized by, The utility model relates to a fixing tool for processing flame tube, comprising: a mounting seat for fixing and connecting the tool on a lathe or milling machine; a small-end expanding mechanism connected with the mounting seat for expanding the small-end straight cylinder of the flame tube in an inner supporting and fixed way; and a large-end expanding mechanism in transmission connection with the small-end expanding mechanism for expanding the large-end straight cylinder of the flame tube in an inner supporting and fixed way; wherein, after the small-end expanding mechanism expands the small-end straight cylinder of the flame tube, the end of the large-end expanding mechanism away from the small-end expanding mechanism is locked with the mounting seat; the mounting seat comprises a disc body and a core shaft with a T-shaped longitudinal section, the disc body is fixedly connected with the lathe or milling machine, and the head of the core shaft is fixedly connected with the sunken area in the middle of the end of the disc body away from the lathe or milling machine to fill the sunken area; the small-end expanding mechanism comprises an expanding sleeve and a plurality of first expanding blocks circumferentially distributed on the outside of the expanding sleeve, the expanding sleeve is in screw connection with the rod of the core shaft, and the taper surface is matched between the end of the expanding sleeve and each first expanding block, each first expanding block is connected with the end of the disc body away from the lathe or milling machine and can slide along the disc body in the radial direction to expand the small-end straight cylinder of the flame tube; the large-end expanding mechanism comprises an adjusting cylinder, a supporting block, an adjusting rod and a second expanding block arranged in sequence, one end of the adjusting cylinder is in clamping connection with the other end of the expanding sleeve to ensure that the two can synchronously rotate around the core shaft, the supporting block is fixedly connected with the other end of the adjusting cylinder and is circumferentially distributed with a plurality of supporting blocks around the axis of the adjusting cylinder, the second expanding block is connected with each supporting block in one-to-one form through the adjusting rod and can slide along the adjusting cylinder in the radial direction to expand the large-end straight cylinder of the flame tube; the rod of the core shaft is in screw connection with a double-headed screw rod after the end thereof away from the head penetrates through the expanding sleeve, the end of the double-headed screw rod away from the core shaft penetrates through the adjusting cylinder and is locked with the adjusting cylinder through the nut in screw connection therewith after the small-end straight cylinder of the flame tube is expanded.

2. The fixing tool for processing flame tube according to claim 1, wherein: one end of the expanding sleeve is provided with a first taper surface; each first expanding block has an inner concave side and an outer convex side to present a fan-shaped cross section, and the inner concave side is provided with a second taper surface; the first taper surface and the second taper surface are in sliding connection.

3. The fixing tool for processing flame tube according to claim 1 or 2, wherein: a plurality of parallel waist-shaped holes are formed in each first expanding block; a screw with an axis parallel to the axis of the core shaft is arranged in each waist-shaped hole; the screw is in screw connection with the end of the disc body away from the lathe or milling machine.

4. The fixing tool for processing flame tube according to claim 1, wherein: the small-end expanding mechanism further comprises a disc sleeve for axial positioning of the flame tube; the disc sleeve is composed of a plurality of arc-shaped members with an L-shaped longitudinal section and surrounded outside the end of the disc body away from the lathe or milling machine; one end of each arc-shaped member is fixedly connected with the disc body through a pair of screws, and the other end is flush with the end of the disc body away from the lathe or milling machine to abut against the end surface of the small-end straight cylinder of the flame tube. The outer diameter of the other end of each arc-shaped member is greater than the inner diameter of the small-end straight cylinder of the flame tube and less than the outer diameter of the small-end straight cylinder of the flame tube.

5. The fixing tool for flame tube machining according to claim 1 or 4, characterized in that: The adjusting cylinder comprises a cylinder sleeve and a disc, a plurality of clamping blocks are connected to the inner circumferential wall of one end of the cylinder sleeve, the plurality of clamping blocks are inserted into a plurality of clamping grooves arranged at the other end of the expansion sleeve in a one-to-one form along the axial direction of the cylinder sleeve to form a spline connection structure; The disc is fixedly connected to the other end of the cylinder sleeve to seal the end, a hole six block is connected to the middle of the disc, the hole six block is in communication with the inside of the cylinder sleeve so that the end of the double-headed screw rod away from the mandrel can freely pass out of the cylinder sleeve; After the small-end straight cylinder of the flame tube is expanded, the nut sleeve is on the double-headed screw rod and abuts against the hole six block to lock the adjusting cylinder.

6. The fixing tool for flame tube machining according to claim 5, characterized in that: A solid six block is arranged on the double-headed screw rod; A lock nut is threadedly connected to one end of the mandrel away from the head portion of the rod portion of the mandrel.

7. The fixing tool for flame tube machining according to claim 5, characterized in that: Each support block has an L-shaped structure in longitudinal section and is fixedly connected to the disc through a pair of screws, and a support plate is arranged in the middle of one side of each support block away from the disc; The adjusting rod is threadedly passed through the support plate, the second expansion block is hingedly connected to the adjusting rod and is in sliding fit with one side of the support block away from the disc.

8. The fixing tool for flame tube machining according to claim 7, characterized in that: A large and small chip removal groove is arranged on one side of the second expansion block abutting against the inner circumferential wall of the large-end straight cylinder of the flame tube; The chip removal groove extends along the circumferential direction of the disc to accommodate the corresponding tool bit and generated iron chips when the large-end straight cylinder of the flame tube is drilled.

9. The fixing tool for flame tube machining according to claim 5, characterized by An L-shaped sleeve is further included for sleeving on the hole six block to rotate the adjusting cylinder.

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