CN120920752B - A tooling and method for machining the outer diameter of an automotive radiator branch pipe. - Google Patents

Abstract

This invention discloses a machining fixture and method for machining the outer diameter of an automotive radiator branch pipe, relating to the technical field of machining fixtures and equipment. It includes: a connector connected to a lathe, a fixing component on which the inner wall of the automotive radiator branch pipe is fixed, and a release component on which the fixing component is released to prevent the fixing component from rotating with the connector. In this invention, two sets of symmetrical and oppositely oriented push threads ensure that the two sets of push rings move synchronously inward when the lathe rotates, achieving symmetrical clamping of the branch pipe on both sides and avoiding the eccentricity problem caused by unilateral clamping. In addition, four sets of evenly distributed connecting lugs (one and four) and corresponding adjusting rods (one and two) ensure that the four sets of clamping blocks move radially synchronously and are subjected to uniform force, guaranteeing centering accuracy. Simultaneously, the rubber abutment blocks of the clamping blocks and the anti-slip rubber layers of clamping blocks one and two form a flexible clamping mechanism from both the inner and outer sides, preventing slippage of the branch pipe and avoiding metal scratches.

Description

Automobile water tank branch pipe excircle turning tool and turning method

Technical Field

The invention relates to the technical field of turning tool equipment, in particular to an automobile water tank branch pipe excircle turning tool and a turning method.

Background

The automobile water tank branch pipe is a key component responsible for shunting cooling liquid and enhancing heat dissipation efficiency in an automobile cooling system, and generally refers to a branch pipeline for connecting a main radiator pipeline with other cooling components, the branch pipe is generally made of metal or high-temperature-resistant plastic, one end of the branch pipe is connected with the main radiator pipeline, the other end of the branch pipe branches to other cooling components, an automobile water tank branch pipe excircle turning tool is a special fixture specially designed for automobile water tank branch pipe excircle machining, the key function is to achieve accurate positioning and stable clamping of the branch pipe, dimensional accuracy and form and position tolerance during excircle turning are guaranteed to meet process requirements, machining efficiency and operation safety are improved at the same time, in the manufacturing process of the automobile water tank branch pipe, inner hole boring is usually carried out preferentially, the excircle surface is turned, the automobile water tank branch pipe is mostly a thin-wall pipe fitting, and the like components such as a radiator and an engine are required to be tightly matched through an inner hole, if the excircle is machined firstly, the excircle is required to be clamped by taking the excircle as a reference during subsequent boring, and the thin-wall excircle is easy to generate elliptical deformation under the effect of the action of clamping force, so that the coaxiality of the inner hole and the excircle is ultra-poor.

The Chinese patent with publication number CN217370519U discloses an excircle turning tool for a thin-walled cylindrical workpiece, which is coaxially connected to a sliding footstock arranged opposite to a lathe triaxial chuck, and comprises a rotary seat and a core column, wherein the fixed end of the rotary seat is fixedly connected to the sliding footstock, the fixed end of the rotary seat rotates and positions a movable end of a supporting connection rotary seat, the core column is axially fixedly connected to the movable end of the rotary seat, and a demoulding unit which radially extends out of the core column and is matched with the supporting on the axial end face of the thin-walled cylindrical workpiece is axially and slidably connected to the core column. The cylindrical turning tool is radially supported in the thin-wall cylinder workpiece, the problem that the thin-wall cylinder is sunken in the cutting process is avoided, and the cylindrical turning tool is simple in structure and high in positioning accuracy.

In the using process, the turning tool only depends on a lathe triaxial chuck to clamp one end of a workpiece at one side, a core column only provides radial inward support, an automobile water tank branch pipe is used as a thin-wall pipe fitting, the single-side clamping force is easy to enable the single-side clamping force to generate eccentric deformation, the form and position tolerance after external circle turning is out of tolerance, the precision fit requirement of a radiator and an engine is difficult to adapt, furthermore, the positioning of the workpiece is realized only through the integral internal support of the core column, if slight machining errors exist in the inner hole of the automobile water tank branch pipe or gaps exist between the core column and the inner hole in a matched mode, the workpiece is easy to deviate radially on the core column, and the centering is inaccurate, and the coaxiality of the external circle and the inner hole is affected.

Disclosure of Invention

The invention aims to solve the problems that in the using process, the turning tool only depends on a lathe triaxial chuck to clamp one end of a workpiece at one side, a core column only provides radial inward support, an automobile water tank branch pipe is used as a thin-wall pipe fitting, the single-side clamping force is easy to enable the automobile water tank branch pipe to generate eccentric deformation, the form and position tolerance after external circle turning is out of tolerance, the accurate matching requirement of a radiator and an engine is difficult to adapt, and furthermore, the turning tool and the turning method of the external circle of the automobile water tank branch pipe are only realized through the integral inward support of the core column, if slight machining errors exist in the inner hole of the automobile water tank branch pipe or gaps exist between the core column and the inner hole, the workpiece is easy to deviate on the core column in the radial direction, the centering is inaccurate, and the coaxiality of the external circle and the inner hole is affected.

The technical scheme includes that the turning tool for the outer circle of the automobile water tank branch pipe comprises a connecting piece connected with a lathe, wherein a fixing piece for fixing the inner wall of the automobile water tank branch pipe is arranged on the connecting piece, and a relieving piece for relieving limitation on the fixing piece is arranged on the fixing piece, so that the fixing piece does not rotate along with the connecting piece;

The fixing piece comprises a clamping block and a rotating ring which is rotationally connected with the connecting piece, a propelling thread is formed on the outer circumferential surface of the rotating shaft, the outer side of the propelling thread is in threaded connection with the propelling ring, a first adjusting rod is arranged between the propelling ring and the clamping block, a second adjusting rod is arranged between the rotating ring and the clamping block, the first adjusting rod and the second adjusting rod are in crossed arrangement, a hinge post is rotationally connected on the first adjusting rod, the hinge post penetrates through the second adjusting rod, and the first adjusting rod and the second adjusting rod are hinged through the hinge post;

When the lathe drives the connecting piece to rotate around the axis of the connecting piece and the releasing piece enables the fixing piece not to rotate along with the connecting piece, the pushing screw threads drive the pushing ring to move towards the rotating ring, the connecting lugs are close together and drive the adjusting rod I to rotate around the hinge post, and the adjusting rod I is hinged with the adjusting rod II and fixed below the clamping block through the connecting lug IV, the included angle between the adjusting rod I and the adjusting rod II is reduced, the clamping block is pushed to move radially, the two end parts of the adjusting rod slide in the sliding groove, and finally the centering clamping is realized by abutting against the inner wall of the branch pipe.

As a still further scheme of the invention, the connecting piece comprises a rotating shaft, a threaded hole is formed in the end face of one side of the rotating shaft, and a stud matched with the threaded hole is formed in the end face of the other side of the rotating shaft.

The outer side of the pushing ring is fixedly connected with a first connecting lug, the bottom end of the clamping block is fixedly provided with a second connecting lug, the first adjusting rod is rotatably arranged between the first connecting lug and the second connecting lug, the bottom end of the clamping block is provided with a sliding groove, the third connecting lug is slidably connected in the sliding groove, the outer circular surface of the rotating ring is fixedly provided with a fourth connecting lug, and the second adjusting rod is rotatably arranged between the third connecting lug and the fourth connecting lug;

two sets of rotating rings, pushing threads and pushing rings are arranged on each set of rotating shaft, the two sets of rotating rings, the pushing threads and the pushing rings are symmetrically distributed, and the directions of the two sets of pushing threads are opposite.

As a still further scheme of the invention, the release piece comprises a first jack arranged on the outer circular surface of the rotating shaft, a second jack is arranged on the outer circular surface of the rotating ring in a penetrating way, and the first jack is communicated with the second jack in an initial state.

As a still further scheme of the invention, the outer circular surface of the rotating ring is fixedly connected with a mounting frame, a push plate is connected in a sliding manner in the mounting frame, the bottom end of the push plate is fixedly connected with a plug rod, one end of the plug rod penetrates through the mounting frame and is in sliding connection with a first jack and a second jack, the top end of the push plate is fixedly connected with a pushing spring, and one end of the pushing spring is fixedly connected with the top end in the mounting frame.

As a still further scheme of the invention, a first guide groove is formed at the bottom end of the push plate, a second guide groove is formed at the bottom end of the inside of the mounting frame, and the first guide groove and the second guide groove are symmetrically distributed.

As a still further scheme of the invention, the release piece further comprises a top plate which is in sliding connection with the first guide groove and the second guide groove, one end of the top plate is provided with a first connecting hole, a first connecting rod is inserted in the first connecting hole, one end of the connecting rod is fixedly connected with a supporting plate, and one end of the supporting plate is fixedly provided with a second connecting hole.

As a still further proposal of the invention, one end of the supporting plate is provided with an extension plate, two ends of the extension plate are also provided with a first connecting rod and a second connecting hole, and the second connecting hole on the supporting plate is spliced with the first connecting rod on the extension plate.

As a still further scheme of the invention, a connecting rod II is inserted in a connecting hole II on the lengthening plate, one end of the connecting rod II is fixedly connected with a fixing block I, one side of the fixing block I is fixedly connected with a telescopic rod I, the top end of the telescopic rod I is fixedly connected with a clamping block I, one end of a top plate is provided with a connecting hole III, a connecting rod III is inserted in the connecting hole III, one end of the connecting rod III is fixedly connected with a fixing block II, one side of the fixing block II is fixedly connected with a telescopic rod II, and one end of the telescopic rod II is fixedly connected with a clamping block II.

A turning method of an outer circle of a branch pipe of an automobile water tank comprises the following steps:

S1, selecting a connecting piece according to the length of a branch pipe to be processed, assembling an adaptive support structure through a stud and a threaded hole of a rotating shaft, butting the connecting piece with a lathe spindle by means of a group of studs, coaxially sleeving the branch pipe outside a clamping block of a fixing piece, and adjusting the branch pipe to a rubber butting block attached to the clamping block on the inner wall of the branch pipe to finish feeding;

S2, pushing the extension plate to drive the support plate and the top plate to slide, pushing the push plate by the top plate to enable the inserted link to be separated from the first jack, removing connection between the rotating ring and the rotating shaft, installing the first fixed block and the second fixed block, pulling the first clamping block and the second clamping block to form temporary clamping, starting the main shaft to enable the fixed piece to be static, pushing the screw thread to drive the clamping block to clamp in a centering mode, removing the temporary assembly, and resetting the inserted link;

S3, finally, starting the lathe spindle again to drive the rotating shaft, the fixing piece and the branch pipe to synchronously rotate, starting the turning tool to turn along the outer circle surface of the branch pipe according to preset parameters after the rotating speed is stable, and finishing the outer circle machining of the branch pipe.

Compared with the prior art, the invention has the beneficial effects that:

1. According to the invention, through the I-shaped section design of the rotating ring in the fixing piece, stable running fit with the rotating shaft is realized, axial movement is limited through the annular bulge, machining deviation caused by displacement of the fixing piece during high-speed rotation is avoided, two groups of symmetrical propelling threads with opposite thread directions are matched, the two groups of propelling rings synchronously move inwards during rotation of the lathe, symmetrical clamping of two sides of a branch pipe is realized, the eccentric problem caused by single-side clamping is avoided, and in addition, four groups of uniformly distributed connecting lugs I, connecting lugs IV and corresponding adjusting rods I and adjusting rods II are adopted, so that the four groups of clamping blocks radially move synchronously and are uniformly stressed, centering precision is ensured, meanwhile, flexible clamping is formed from the inner side and the outer side of the clamping block, so that the branch pipe is prevented from slipping, metal scratches are avoided, and the surface roughness of the branch pipe is ensured to meet the technological requirements;

2. According to the invention, through the design of screw holes and studs of the rotating shafts in the connecting pieces, multiple groups of connecting pieces can be flexibly spliced according to the lengths of the branch pipes, tools are not required to be designed for the branch pipes with different lengths, the length adaptability is improved, eight groups of first jacks and second jacks of the same section of the rotating shafts in the connecting pieces are relieved, the multi-angle positioning of the fixing pieces is realized, the positions can be adjusted according to the clamping requirements, the use flexibility is enhanced, the support plates are connected with the extension plates in a plug-in manner, the lengths of the components can be adjusted according to the lengths of the rotating shafts, different lathe specifications can be adapted, and the telescopic travel of the telescopic rods I and II can cover the branch pipes with different diameters, so that the branch pipes with different specifications can be compatible without changing core components, and the adaptation cost and the mold changing time are greatly reduced;

3. according to the invention, the pre-compression design of the pushing spring in the release piece automatically provides downward elastic force for the push plate, so that the insert rod in the initial state is stably inserted into the insertion hole, manual pressing and positioning are not needed, the operation flow is simplified, the design of the triangular arc surface of the top plate is simplified, the axial force pushing the lengthened plate is converted into upward pushing force of the push plate, labor is saved, abrasion of the bottom end of the push plate is avoided, the service life of a part is prolonged, the arc-shaped holding edges of the clamping block I and the clamping block II are subjected to knurling treatment with the inner rod of the telescopic rod, the force application difficulty of manual operation is reduced, the hand slipping is prevented, meanwhile, the T-shaped sliding groove is tightly matched with the connecting lug III, accurate guide is provided for the clamping block, the deviation of the clamping position is avoided, the processing stability is ensured, and the rejection rate is reduced.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view showing a fixing state of a fixing member according to the present invention;

FIG. 3 is a schematic view of the structure of the fixing member of the present invention;

FIG. 4 is a cross-sectional view of the structure of the connector of the present invention;

FIG. 5 is a schematic view of the structure of the mounting frame of the present invention;

FIG. 6 is a schematic view of the structure of FIG. 5A in accordance with the present invention;

FIG. 7 is a structural cross-sectional view of a rotating ring in accordance with the present invention;

Fig. 8 is a schematic view of the structure of the support plate in the present invention;

FIG. 9 is a schematic view of the structure of the release member of the present invention;

FIG. 10 is a schematic view of the structure of FIG. 9B in accordance with the present invention;

Fig. 11 is a schematic view of the structure at C of fig. 9 in the present invention.

In the figure, 1, a connecting piece, 11, a rotating shaft, 12, a threaded hole, 13, a stud, 2, a fixing piece, 21, a rotating ring, 22, a pushing thread, 23, a pushing ring, 24, a connecting lug I, 25, a regulating rod I, 26, a connecting lug II, 27, a clamping block, 28, a sliding groove, 29, a connecting lug III, 210, a regulating rod II, 211, a connecting lug IV, 212, a hinged post, 3, a releasing piece, 31, a jack I, 32, a jack II, 33, a mounting frame, 34, a pushing plate, 35, a plunger rod, 36, a pushing spring, 37, a guide groove I, 38, a guide groove II, 39, a top plate, 310, a connecting hole I, 311, a connecting rod I, 312, a supporting plate, 313, a connecting hole II, 314, a lengthening plate, 315, a connecting rod II, 316, a fixing block I, 317, a telescopic rod I, 318, a clamping block I, 319, a connecting hole III, 320, a connecting rod III, 321, a fixing block II, 322, a telescopic rod II, 323, and a clamping block II.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the present invention, unless explicitly stated or limited otherwise, the terms "mounted," "connected," and "configured" are to be construed broadly, and may, for example, be fixedly connected, detachably connected, or integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediary, or communicate between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art. Hereinafter, an embodiment of the present invention will be described in accordance with its entire structure.

Referring to fig. 1 to 3, in the embodiment of the invention, the turning tool for the outer circle of the automobile water tank branch pipe comprises a connecting piece 1 connected with a lathe, wherein a fixing piece 2 for fixing the inner wall of the automobile water tank branch pipe is arranged on the connecting piece 1, a release piece 3 for releasing the limit of the fixing piece 2 is arranged on the fixing piece 2, so that the fixing piece 2 does not rotate along with the connecting piece 1, the connecting piece 1 comprises a rotating shaft 11, a threaded hole 12 is arranged on one side end surface of the rotating shaft 11, a stud 13 matched with the threaded hole 12 is arranged on the other side end surface of the rotating shaft 11, a plurality of groups of connecting pieces 1 are arranged and are matched with the length of the automobile water tank branch pipe, and two adjacent groups of connecting pieces 1 are in threaded connection through the threaded hole 12 and the stud 13.

Referring to fig. 3 to 4, the fixing member 2 includes a rotating ring 21 rotatably connected to the connecting member 1, the section of the rotating ring 21 is i-shaped, the structure not only can limit axial movement during rotation by annular protrusions, but also can increase the contact area with the connecting member 1 to improve rotation stability, and prevent shaking during high-speed rotation, the outer circumferential surface of the rotating shaft 11 is processed with a push thread 22, the push thread 22 adopts a trapezoidal tooth structure, the threaded surface is quenched to enhance wear resistance, the outer side of the push thread 22 is in threaded connection with the push ring 23, and each group of rotating shafts 11 is provided with two groups of rotating rings 21, The propulsion screw thread 22 and the propulsion ring 23 are symmetrically distributed, wherein one group of propulsion screw thread 22 is right-handed and the other group is left-handed, so that the two groups of propulsion rings 23 can synchronously move towards the rotating ring 21 during subsequent actions, the propulsion ring 23 is of an annular structure, four groups of connecting lugs 24 are fixedly connected to the outside of the propulsion ring, the four groups of connecting lugs 24 are uniformly distributed along the circumference of the propulsion ring 23, a group of regulating rods 25 are rotatably connected to each group of connecting lugs 24, each group of connecting lugs 24 is made of an alloy steel plate, through holes are formed in the regulating rods and form a rotating fit with pin shafts at the end parts of the regulating rods 25, the regulating rods 25 are of a square structure, the hollow design reduces the weight, ensures the structural rigidity, avoids stress deformation, one end of each group of regulating rods 25 far away from the connecting lugs 24 is rotatably connected with the group of connecting lugs 26 through the pin shafts, the top ends of the connecting lugs 26 are fixedly connected with the clamping blocks 27, the clamping block 27 is a cuboid aluminum alloy part, the top end of the cuboid aluminum alloy part is adhered with a semicircular rubber abutting block, friction force between the clamping block 27 and the inner wall of the branch pipe can be increased to prevent slipping, the branch pipe can be prevented from being scratched by metal, a T-shaped sliding groove 28 is formed in the bottom end of the clamping block 27, a T-shaped connecting lug III 29 is connected in a sliding manner in the sliding groove 28 in a sliding manner, a clearance fit between the clamping block and the sliding groove is ensured, no clamping and no radial movement are ensured during sliding, the connecting lug III 29 is rotationally connected with a regulating rod II 210 through a pin shaft, the regulating rod II 210 is consistent with a regulating rod I25 in structure, one end of the regulating rod II 210 far away from the connecting lug III 29 is rotationally connected with a connecting lug IV 211 through a pin shaft, the connecting lug IV 211 is fixed with the outer circular surface of the rotating ring 21, four groups of connecting lugs IV 211 are uniformly distributed on the outer circular surface of each group of the rotating ring 21 and are in one-to-one correspondence with the connecting lug I24, the position of the regulating rod I25 close to the middle part is rotationally connected with a hinge post 212, the hinge post 212 is a stainless steel pin shaft, two ends of the hinge post are provided with snap spring grooves, the hinge post is fixed through the snap springs after penetrating the second adjusting rod 210, the hinge joint of the first adjusting rod 25 and the second adjusting rod 210 is ensured to rotate flexibly and not to be separated, when an operator coaxially sleeves the automobile water tank branch pipe to be processed outside two groups of symmetrical clamping blocks 27, after ensuring that the top end inside the branch pipe is primarily attached to the rubber abutting block of one group of the clamping blocks 27, a lathe spindle is started, when the lathe spindle drives the connecting piece 1 to rotate clockwise around the axis of the lathe spindle, the operation release piece 3 keeps the fixing piece 2 stationary and does not rotate along with the connecting piece 1, at the moment, two groups of pushing threads 22 on the connecting piece 1 rotate along with the connecting piece 1, the two groups of pushing rings 23 are driven to synchronously move towards the corresponding group of rotating rings 21 due to the meshing effect of the threads, when the pushing rings 23 move, four groups of connecting lugs 24 on the outer side of the pushing rings synchronously approach the rotating rings 21, and then drives the first adjusting rod 25 on each group of the first connecting lugs 24 to rotate by taking the hinge post 212 as a fulcrum, when the first adjusting rod 25 rotates, because the first adjusting rod 25 is hinged with the second adjusting rod 210 through the hinge post 212, the other end of the second adjusting rod 210 is fixed on the rotating ring 21 through the fourth connecting lug 211, the rotation of the first adjusting rod 25 forces the second adjusting rod 210 to synchronously rotate, the included angle between the first adjusting rod 25 and the second adjusting rod 210 gradually reduces, when the included angle between the first adjusting rod 25 and the second adjusting rod 210 reduces, the first adjusting rod 25 pushes the clamping block 27 to move in the radial direction far from the axis of the connecting piece 1 through the second connecting lug 26, meanwhile, the third connecting lug 29 stably slides in the T-shaped sliding groove 28 at the bottom end of the clamping block 27 along the direction far from the hinge post 212 to provide accurate guide for the clamping block 27, when the rubber abutting block at the top end of the clamping block 27 is tightly abutted against the inner wall of the branch pipe, and when the load of the lathe spindle reaches a preset value, the movement of the pushing ring 23 is stopped, and (3) finishing centering and clamping the branch pipe, and starting a turning tool to machine the outer circle of the branch pipe.

By adopting the scheme, stable rotation fit with the connecting piece 1 is realized through the I-shaped section design of the rotating ring 21, axial movement is limited, integral rotation stability of the device is improved, excessive outer circle dimension errors of the branch pipes caused by movement during processing are avoided, two groups of symmetrically distributed pushing threads 22 with opposite thread directions are used for ensuring synchronous inward movement of the two groups of pushing rings 23 during lathe rotation, symmetrical clamping on two sides of the branch pipes is realized, eccentric branch pipes caused by single-side clamping is avoided, radial movement of the four groups of clamping blocks 27 is synchronous and uniformly stressed through the four groups of uniformly distributed connecting lugs 24, the four connecting lugs 211 and the corresponding adjusting rods 25 and the two adjusting rods 210, the shape and position tolerance requirements of subsequent outer circle turning are met, friction force between the top ends of the clamping blocks 27 and the inner wall of the branch pipes is increased, the branch pipes are prevented from skidding during processing, metal is prevented from directly contacting the inner wall of the scratch branch pipes, the surface quality of the branch pipes is protected, tight fit between the T-shaped sliding grooves 28 and the T-shaped connecting lugs 29 is avoided, accurate guiding is provided for radial movement of the clamping blocks 27, and accuracy of clamping block 27 is ensured.

Referring to fig. 5 to 9, the release member 3 includes a first jack 31 provided on an outer circumferential surface of the rotating shaft 11, the first jack 31 is a cylindrical hole, the first jack is perpendicular to an axis of the rotating shaft 11 and penetrates through the outer circumferential surface of the rotating shaft 11, a second jack 32 is provided on the outer circumferential surface of the rotating ring 21, the second jack 32 has a diameter identical to the first jack 31, the depth of the hole is identical to the wall thickness of the rotating ring 21, eight groups of first jacks 31 and eight groups of second jacks 32 are uniformly provided at a same horizontal section of the rotating shaft 11, a mounting frame 33 is fixedly welded on the outer circumferential surface of the rotating ring 21, the mounting frame 33 is in a square structure, the four groups of mounting frames 33 are uniformly distributed along the outer circumferential surface of the rotating ring 21, a group of pushing plates 34 are slidably connected inside each group of the mounting frame 33, the pushing plates 34 are in a cuboid structure, a polytetrafluoroethylene coating is sprayed on the surface to reduce a sliding friction coefficient, a plug rod 35 is fixedly welded at a central position of the bottom end of the pushing plates 34, one end of the plug rod 35 penetrates through the bottom end of the mounting frame 33, and the first jack 31 is fixedly arranged, The second jack 32 forms clearance fit, ensure to peg graft firmly and be convenient for plug, the first jack 31 and the second jack 32 are completely aligned and communicate under the initial condition, ensure that the inserted link 35 can insert smoothly, two sets of propulsion springs 36 of symmetrical fixedly connected with in every push pedal 34 top, propulsion springs 36 are cylindrical helical compression springs, precompression under the initial condition, provide continuously downward elasticity, ensure that the jack 35 inserts the jack steadily, the one end that propulsion springs 36 kept away from push pedal 34 and the inside top welded fastening of installing frame 33, two sets of guide slots one 37 have been seted up to push pedal 34 bottom symmetry, two sets of guide slots two 38 have been seted up to installing frame 33 inside bottom correspondence, guide slot one 37 and guide slot two 38 are the rectangle groove, form complete guide way after both alignment, release piece 3 still includes with guide slot one 37%, the top plate 39 of the sliding insertion type of the second guide groove 38 is of a triangle-like structure, the top end of the top plate is an arc surface, the width of the top plate is consistent with the width of the guide groove, the top plate can smoothly slide along the guide groove, a first connecting hole 310 is formed in one end of the top plate 39 far away from the arc surface, a first connecting rod 311 is inserted in the first connecting hole 310 in an interference manner, a supporting plate 312 is fixedly welded at one end of the first connecting rod 311 far away from the top plate 39, the supporting plate 312 is a cuboid steel plate, a second connecting hole 313 is formed at one end of the supporting plate 312, an extension plate 314 is arranged at one end of the supporting plate 312 in a matched manner, the extension plate 314 is consistent with the structure of the supporting plate 312, the first connecting rod 311 is welded at two ends of the same, the second connecting hole 313 is formed, the second connecting hole 313 of the supporting plate 312 is in clearance plug-in connection with the first connecting rod 311 of the extension plate 314, the quick splicing of the supporting plate 312 and the extension plate 314 is realized, the rotating shafts 11 with different lengths are adapted, the length of the supporting plate 312 connected with the top plate 39 is the same as that of the rotating shaft 11, the length of the extension plate 314 is the same as that of the supporting plate 312 connected with the top plate 39, when the device is in an initial fixed state, the pre-pressure of the pushing spring 36 pushes the push plate 34 to move downwards, so that the inserting rod 35 penetrates through the mounting frame 33 and then is inserted into the first jack 31 and the second jack 32, at this moment, the fixing piece 2 and the rotating shaft 11 are fixed through the inserting rod 35 and cannot rotate relatively, when the connection between the fixing piece 2 and the rotating shaft 11 needs to be released to start the clamping action, an operator pushes the extension plate 314 along the axial direction of the rotating shaft 11 to drive the supporting plate 312 plugged with the extension plate 314 to move synchronously, the supporting plate 312 pushes the top plate 39 to slide along the first guide groove 37 and the second guide groove 38 through the first connecting rod 311, when the cambered surface end of the top plate 39 contacts the bottom end 34 of the top plate 39, the pushing plate 34 continuously slides along with the first connecting rod 39, the elastic force of the pushing plate 36 pushes the push plate 34 upwards, the first jack 34 pushes the upper rod 34 upwards, the inserting rod 35 moves upwards, the inserting rod 35 is completely against the jack 35 and the jack 35 is completely separated from the jack 35 when the fixing piece 2 is completely, and the fixing piece is completely kept in the fixed by the fixing piece is completely, and the fixing piece is kept in the jack is only when the fixing and the jack is completely fixed by the jack is kept, The supporting plate 312 and the top plate 39 are pulled out of the guide groove, so that the pushing spring 36 is restored to the original length, the inserting rod 35 is pushed to be reinserted into the first inserting hole 31 and the second inserting hole 32 under the action of the elastic force of the pushing spring 36, the fixing piece 2 and the rotating shaft 11 are restored to the fixing state, and the whole device is convenient to detach or adjust.

By adopting the scheme, through the uniform distribution of the eight groups of jacks I31 and the eight groups of jacks II 32 at the same horizontal section of the rotating shaft 11, the multi-angle positioning of the fixing piece 2 in the circumferential direction of the rotating shaft 11 can be realized, the fixing position can be adjusted according to the processing requirement of the branch pipes, the universality of the device is improved, downward elastic force can be automatically provided for the push plate 34 through the precompression design of the pushing springs 36, the stable insertion of the inserting rods 35 into the jacks is ensured, the manual pressing positioning is not needed, the convenience of operation is improved, the accurate sliding guide is provided for the top plate 39 through the matching of the guide grooves I37 at the bottom end of the push plate 34 and the guide grooves II 38 of the mounting frame 33, the uneven stress of the push plate 34 caused by the offset of the top plate 39 is avoided, the smooth insertion and extraction action of the inserting rods 35 is ensured, the axial force of an operator pushing the extension plate 314 is converted into upward pushing force of the push plate 34 through the triangle-like arc surface design of the top plate 39, the labor is saved, the bottom end damage of the push plate 34 is avoided, the service life of the parts is prolonged, the lathe is connected with the extension plate 314 through the insertion connection of the support plates 312, and the length of the extension plate 314 can be flexibly spliced according to the length of the rotating shaft 11, the connecting pieces 1 with different specifications are adapted, and the cost of the device is reduced.

Referring to fig. 9 to 11, in a second connecting hole 313 of an end of the extension plate 314 far away from the support plate 312, a second connecting rod 315 is inserted and connected in a clearance fit manner, one end far away from the second connecting hole 313 is fixedly connected with a first fixing block 316 through arc welding, a third connecting hole 319 is formed in the center position of one side of the first fixing block 316, the first telescopic rod 317 is a spring telescopic rod and consists of an outer cylinder and a plurality of sleeved inner cylinders, the inner cylinders can axially slide along the outer cylinder, a contraction spring is arranged in the inner cylinder, the contraction spring is in a precompressed state in the initial state, the inner cylinders completely retract into the outer cylinder, a first clamping block 318 is fixedly welded at the top end of the first telescopic rod 317, the first clamping block 318 is in an arc-shaped structure, a thick nitrile rubber layer structure is wrapped outside a metal core, diamond-shaped anti-skid patterns are formed on the surface, an arc-shaped holding edge is further arranged on the outer side, manual force application is facilitated, a third connecting hole 319 is formed in one end of the top plate 39 far away from the first connecting rod 311, a third connecting rod 320 is inserted and connected in the connecting hole 319 in the same clearance fit manner, the structure is, The material is identical with the second connecting rod 315, the second fixing block 321 is welded and fixed at one end of the third connecting rod 320, one side of the second fixing block 321 is welded and fixed with the second telescopic rod 322, the second telescopic rod 322 is identical with the first telescopic rod 317 in specification, the second clamping block 323 is welded and fixed at one end of the second telescopic rod 322, the second clamping block 323 is identical with the first clamping block 318 in structure and symmetrically arranged, the first fixing block 316, the first telescopic rod 317, the first clamping block 318, the second fixing block 321, the second telescopic rod 322 and the second clamping block 323 are correspondingly provided with four groups, the two groups are uniformly distributed along the circumferential direction of the end face of the rotating shaft 11, when the fixing preparation before the external turning of the automobile water tank branch pipe is needed, an operator firstly coaxially sleeves the branch pipe to be processed outside the fixing piece 2, and then the extension plate 314, The end bosses of the supporting plate 312 and the top plate 39 are aligned with the first guide groove 37 and the second guide groove 38 to be slowly inserted until the top plate 39 pushes the push plate 34 to move upwards, the inserting rod 35 is completely separated from the first insertion hole 31, the connection between the rotating ring 21 and the rotating shaft 11 is formally released, at the moment, the first fixing block 316 is inserted into the second connection hole 313 of the lengthening plate 314 through the second connecting rod 315, the second fixing block 321 is simultaneously inserted into the third connection hole 319 of the top plate 39 through the third connecting rod 320, the two groups of connection are ensured to be free from looseness, then an operator clamps the holding edges of the first clamping block 318 and the outer side of the second clamping block 323 by fingers, the first telescopic rod 317 and the second telescopic rod 322 are manually pulled in a direction far from the center of the rotating shaft 11, the shrinkage springs in the first telescopic rod 317 and the second telescopic rod 322 gradually release elastic potential energy, the inner cylinder stretches out along the outer cylinder until the rubber layers of the inner side of the first clamping block 318 and the second clamping block 323 are completely attached to the outer circumferential surface of the branch pipe, stable temporary clamping is formed, and when the rotating shaft 11 is driven by a lathe to rotate around the axis, the first clamping block 318 is enabled to be a whole, The static friction force between the clamping block II 323 and the outer circle of the branch pipe, the lengthening plate 314 and the top plate 39 are limited by the guide grooves and cannot rotate, the fixing piece 2 keeps static along with the branch pipe, the pushing threads 22 on the connecting piece 1 rotate along with the rotating shaft 11, the pushing ring 23 is driven to move towards the rotating ring 21, finally the clamping block 27 is pushed by the adjusting plate assembly to clamp the inner wall of the branch pipe, after the outer circle turning of the branch pipe is completed, the clamping block I318 and the clamping block II 323 are pushed by an operator reversely, the telescopic rod I317 and the telescopic rod II 322 shrink and reset, and then the lengthening plate 314, the supporting plate 312 and the top plate 39 are pulled out, so that the processed branch pipe can be taken out.

By adopting the scheme, the outer circle surface of the branch pipe is uniformly stressed through the four groups of uniformly distributed and symmetrical clamping blocks I318 and II 323, the branch pipe deformation caused by single-side clamping is avoided, the coaxiality precision of the subsequent inner hole clamping is ensured, the friction force with the outer circle of the branch pipe can be increased through the nitrile rubber layer with anti-skid patterns on the inner side of the clamping block, slipping during temporary clamping is prevented, metal can be prevented from being directly contacted with the outer circle of the branch pipe, the force application difficulty of manually pulling the clamping block is reduced through the arc-shaped holding edge on the outer side of the clamping block and the knurling treatment of the inner rod of the telescopic rod, the hand slipping of operators is avoided, the comfort and efficiency of manual operation are improved, stable clamping force can be generated during release through the precompression design of the telescopic rod inner contraction spring, the temporary clamping is ensured to be firm, and reliable guarantee is provided for the static holding of the fixing piece 2.

When an operator uses the turning fixture for the excircle of the automobile water tank branch pipe, firstly, a corresponding number of connecting pieces 1 are selected according to the length of the branch pipe to be processed, two adjacent groups of connecting pieces 1 are connected with threaded holes 12 on the other side by groups in a threaded manner through studs 13 on one side of a rotating shaft 11 to be assembled into a supporting structure matched with the length of the branch pipe, then the assembled connecting pieces 1 are integrally and fixedly connected with a lathe spindle by means of studs 13 on one side of one group of rotating shaft 11 to finish the butt joint of the fixture and the lathe, then the automobile water tank branch pipe to be processed is sleeved on the outer side of a clamping block 27 of a fixing piece 2 in a coaxial manner, the position of the branch pipe is adjusted, the inner wall of the branch pipe is ensured to be primarily attached to a semicircular rubber abutting block on the top end of one group of clamping blocks 27, so that the branch pipe is coaxially positioned, the feeding is completed, then, a lengthening plate 314 is pushed along the axis direction of the rotating shaft 11 to drive a supporting plate 312 connected with the lengthening plate 314 to synchronously move, the supporting plate 312 pushes a top plate 39 through a connecting rod 311, the top plate 39 slides smoothly along a guide groove 37 and a guide groove 38, when the cambered surface end of the top plate 39 contacts the bottom end of the push plate 34, the cambered surface end of the top plate 39, the lengthening plate 314 continues to push the pushing the top plate, the pushing plate 314, the pushing plate 36 is pulled upwards, and the pushing the thrust rod is completely and the thrust rod 35 is pulled upwards, and the thrust rod is completely, and the thrust rod 35 is completely overcomes the thrust force of the thrust rod 35, and the thrust rod is completely The fixed connection between the rotating ring 21 and the rotating shaft 11 is released after the fixed connection between the rotating ring 21 and the rotating shaft 11 is reserved in the second jack 32, the first fixed block 316 is inserted into the second connecting hole 313 of the lengthening plate 314 through the second connecting rod 315, the second fixed block 321 is simultaneously inserted into the third connecting hole 319 of the top plate 39 through the third connecting rod 320, the two groups of connection are ensured to be free from looseness, an operator buckles the holding edges of the outer sides of the first clamping block 318 and the second clamping block 323 and slowly pulls the holding edges away from the center of the rotating shaft 11, the contraction springs in the first telescopic rod 317 and the second telescopic rod 322 gradually release elastic potential energy, the inner cylinder stretches outwards along the outer cylinder until the rubber layers of the inner sides of the first clamping block 318 and the second clamping block 323 completely cling to the outer circular surface of the branch pipe to form stable annular temporary clamping, then the lathe spindle is started to drive the rotating shaft 11 to rotate clockwise, due to static friction force between the rubber layers of the temporary clamping and the outer circular pipe, and the lengthening plate 314, The top plate 39 is limited by the guide groove and can not rotate, the fixing piece 2 is kept in a static state, at this moment, two groups of pushing threads 22 on the connecting piece 1 synchronously rotate along with the rotating shaft 11, the two groups of pushing rings 23 synchronously move towards the rotating ring 21 under the action of thread engagement, the first connecting lug 24 on the outer side of the pushing rings 23 is close to the rotating ring 21, and then the first adjusting rod 25 is driven to rotate by taking the hinge post 212 as a fulcrum, as the first adjusting rod 25 and the second adjusting rod 210 are hinged through the hinge post 212, the other end of the second adjusting rod 210 is fixed on the rotating ring 21 through the fourth connecting lug 211, the rotation of the first adjusting rod 25 can force the second adjusting rod 210 to synchronously rotate, the included angle between the first adjusting rod and the second adjusting rod is gradually reduced, the second adjusting rod 25 pushes the clamping block 27 to move towards the radial direction far away from the axis of the rotating shaft 11 through the second connecting lug 26, meanwhile, the third connecting lug 29 slides in the T-shaped sliding groove 28 at the bottom end of the clamping block 27 along the direction far away from the hinge post 212, provides accurate guide for the clamping block 27, when the rubber at the top end of the clamping block 27 is tightly abutted against the inner wall of the branch pipe, and when the load of the main shaft of the lathe reaches a preset value, the clamping process is completed, and when the round branch pipe is ready to be machined, the second end is sequentially pulled out, and the second connecting rod 313 is matched with the connecting hole 313 in turn, and the second end is matched with the connecting hole 313 when the outside the branch pipe is ready to be inserted and matched with the connecting hole 313 The connecting rod III 320 is matched with the connecting hole III 319 in an inserting way, the fixing block I316, the telescopic rod I317, the clamping block I318, the fixing block II 321, the telescopic rod II 322 and the clamping block II 323 are taken down, then the lengthening plate 314 is pulled reversely, the top plate 39 and the supporting plate 312 are pulled out of the guide groove I37 and the guide groove II 38, the pushing spring 36 is restored to the original length after losing the pushing force, the pushing plate 34 is pushed to return downwards under the action of the elastic force, the inserting rod 35 is driven to be reinserted into the inserting hole I31 and the inserting hole II 32, the fixing piece 2 is enabled to be fixedly connected with the rotating shaft 11, at the moment, the fixing piece 2 can synchronously rotate along with the rotating shaft 11, finally, the lathe main shaft is started again, the rotating shaft 11 is driven, through the I-shaped section design of the rotating ring 21 in the fixed part 2, not only realizing stable rotating fit with the rotating shaft 11, but also limiting axial movement through annular protrusions, avoiding machining deviation caused by displacement of the fixed part 2 during high-speed rotation, matching two groups of symmetrical pushing threads 22 with opposite thread directions, ensuring that the two groups of pushing rings 23 synchronously move inwards during lathe rotation, realizing symmetrical clamping of two sides of the branch pipes, avoiding eccentric problem caused by single-side clamping, and adding four groups of uniformly distributed connecting lugs 24, The four connecting lugs 211 and the corresponding first adjusting rod 25 and second adjusting rod 210 lead the radial movement of the four groups of clamping blocks 27 to be synchronous and the stress to be even, ensure the centering precision, and simultaneously, the rubber abutting block of the clamping blocks 27 and the first clamping block 318, The anti-slip rubber layer of the clamping block II 323 forms flexible clamping from the inner side and the outer side, so that the branch pipe is prevented from slipping, metal scratch is avoided, the surface roughness of the branch pipe is ensured to meet the technological requirement, multiple groups of connecting pieces 1 can be flexibly spliced according to the length of the branch pipe through the design of the threaded holes 12 of the rotating shaft 11 and the studs 13 in the connecting piece 1, tools are not required to be independently designed for branch pipes with different lengths, the length adaptability is improved, eight groups of first jacks 31 and second jacks 32 with the same section of the rotating shaft 11 in the releasing piece 3 are not required to be independently designed, the multi-angle positioning of the fixing piece 2 is realized, the positions can be adjusted according to the clamping requirements, the use flexibility is enhanced, the supporting plate 312 is connected with the extension plate 314 in a plugging manner, the length of a component can be adjusted according to the length of the rotating shaft 11, different lathe specifications are adapted, and the telescopic rod I317, The telescopic stroke of the telescopic rod II 322 can cover branch pipes with different diameters, the core component is not required to be replaced, the telescopic rod II can be compatible with the branch pipes with multiple specifications, the adapting cost and the changing time are greatly reduced, the pre-compression design of the pushing spring 36 in the release piece 3 is adopted, downward elastic force is automatically provided for the pushing plate 34, the stable insertion of the inserting rod 35 in an initial state into the inserting hole is ensured, manual pressing and positioning are not required, the operation flow is simplified, the design of the triangle-like cambered surface of the top plate 39 is realized, the axial force pushing the lengthening plate 314 is converted into the upward pushing force of the pushing plate 34, labor is saved, the bottom end abrasion of the pushing plate 34 is avoided, the service life of the component is prolonged, the arc-shaped holding edges of the clamping block I318 and the clamping block II 323 are subjected to knurling treatment with the telescopic rod inner rod, the force application difficulty of manual operation is reduced, the hand slip is prevented, meanwhile, the tight fit of the T-shaped sliding groove 28 and the connecting lug III 29 is provided, the accurate guide is avoided, the clamping position deviation is ensured, and the processing stability is reduced, and the rejection rate is reduced.

The foregoing description is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical solution of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (4)

1. The turning tool for the outer circle of the automobile water tank branch pipe comprises a connecting piece (1) connected with a lathe and is characterized in that a fixing piece (2) for fixing the inner wall of the automobile water tank branch pipe is arranged on the connecting piece (1), and a release piece (3) for releasing the limit of the fixing piece (2) is arranged on the fixing piece (2) so that the fixing piece (2) does not rotate along with the connecting piece (1);

The connecting piece (1) comprises a rotating shaft (11), a threaded hole (12) is formed in the end face of one side of the rotating shaft (11), and a stud (13) matched with the threaded hole (12) is formed in the end face of the other side of the rotating shaft (11);

The fixing piece (2) comprises a clamping block (27) and a rotating ring (21) rotationally connected with the connecting piece (1), a propelling thread (22) is formed on the outer circular surface of the rotating shaft (11), a propelling ring (23) is connected to the outer side of the propelling thread (22) in a threaded mode, a regulating rod I (25) is arranged between the propelling ring (23) and the clamping block (27), a regulating rod II (210) is arranged between the rotating ring (21) and the clamping block (27), the regulating rod I (25) and the regulating rod II (210) are arranged in a crossed mode, a hinge post (212) is rotationally connected to the regulating rod I (25), the hinge post (212) penetrates through the regulating rod II (210), and the regulating rod I (25) is hinged with the regulating rod II (210) through the hinge post (212);

The outer side of the pushing ring (23) is fixedly connected with a first connecting lug (24), the bottom end of the clamping block (27) is fixedly provided with a second connecting lug (26), the first adjusting rod (25) is rotatably arranged between the first connecting lug (24) and the second connecting lug (26), a sliding groove (28) is formed in the bottom end of the clamping block (27), a third connecting lug (29) is slidably connected in the sliding groove (28), a fourth connecting lug (211) is fixedly arranged on the outer circular surface of the rotating ring (21), and the second adjusting rod (210) is rotatably arranged between the third connecting lug (29) and the fourth connecting lug (211);

Two groups of rotating rings (21), pushing threads (22) and pushing rings (23) are arranged on each group of rotating shafts (11), the two groups of rotating rings (21), the pushing threads (22) and the pushing rings (23) are symmetrically distributed, and the directions of the two groups of pushing threads (22) are opposite;

The release piece (3) comprises a first jack (31) arranged on the outer circular surface of the rotating shaft (11), a second jack (32) is arranged on the outer circular surface of the rotating ring (21) in a penetrating way, and the first jack (31) is communicated with the second jack (32) in an initial state;

The outer circular surface of the rotating ring (21) is fixedly connected with a mounting frame (33), a push plate (34) is connected in a sliding manner in the mounting frame (33), an inserting rod (35) is fixedly connected to the bottom end of the push plate (34), one end of the inserting rod (35) penetrates through the mounting frame (33) and is in sliding connection with a first jack (31) and a second jack (32), a pushing spring (36) is fixedly connected to the top end of the push plate (34), and one end of the pushing spring (36) is fixedly connected with the top end inside the mounting frame (33);

The bottom end of the push plate (34) is provided with a first guide groove (37), the bottom end inside the mounting frame (33) is provided with a second guide groove (38), and the first guide groove (37) and the second guide groove (38) are symmetrically distributed;

The release piece (3) further comprises a top plate (39) which is in sliding connection with the first guide groove (37) and the second guide groove (38), a first connecting hole (310) is formed in one end of the top plate (39), a first connecting rod (311) is inserted into the first connecting hole (310), one end of the first connecting rod (311) is fixedly connected with a supporting plate (312), and a second connecting hole (313) is fixedly formed in one end of the supporting plate (312);

When the lathe drives the connecting piece (1) to rotate around the axis of the connecting piece, the release piece (3) enables the fixing piece (2) not to rotate along with the connecting piece, the pushing thread (22) drives the pushing ring (23) to move towards the rotating ring (21), the first connecting lug (24) is synchronously close to the connecting piece, the first adjusting rod (25) is driven to rotate around the hinge post (212), the second adjusting rod (210) is hinged due to the fact that the first adjusting rod (25) is hinged to the second adjusting rod (210), the second adjusting rod (210) is fixed below the clamping block (27) through the fourth connecting lug (211), the included angle between the first adjusting rod (25) and the second adjusting rod (210) is reduced, the clamping block (27) is pushed to move radially, the end portion of the second adjusting rod (210) slides in the sliding groove (28), and finally the end portion of the second adjusting rod is abutted to the inner wall of the branch pipe to achieve centering clamping.

2. The turning tool for the outer circle of the branch pipe of the automobile water tank according to claim 1, wherein an extension plate (314) is arranged at one end of the supporting plate (312), a first connecting rod (311) and a second connecting hole (313) are also arranged at two ends of the extension plate (314), and the second connecting hole (313) in the supporting plate (312) is spliced with the first connecting rod (311) in the extension plate (314).

3. The turning tool for the outer circle of the branch pipe of the automobile water tank according to claim 2, wherein a connecting rod II (315) is inserted in a connecting hole II (313) on the lengthening plate (314), one end of the connecting rod II (315) is fixedly connected with a fixing block I (316), one side of the fixing block I (316) is fixedly connected with a telescopic rod I (317), the top end of the telescopic rod I (317) is fixedly connected with a clamping block I (318), a connecting hole III (319) is formed in one end of the top plate (39), a connecting rod III (320) is inserted in the connecting hole III (319), one end of the connecting rod III (320) is fixedly connected with a fixing block II (321), one side of the fixing block II (321) is fixedly connected with a telescopic rod II (322), and one end of the telescopic rod II (322) is fixedly connected with a clamping block II (323).

4. A method for turning an outer circle of a branch pipe of an automobile water tank, which uses the tool for turning the outer circle of the branch pipe of the automobile water tank according to claim 3, and is characterized by comprising the following steps:

S1, firstly, selecting a connecting piece (1) according to the length of a branch pipe to be processed, assembling an adaptive support structure through a stud (13) of a rotating shaft (11) and a threaded hole (12), butting the connecting piece (1) with a lathe spindle by means of a group of studs (13), sleeving the branch pipe outside a clamping block (27) of a fixing piece (2) in a coaxial manner, and adjusting to a rubber butting block attached to the clamping block (27) on the inner wall of the branch pipe to finish feeding;

S2, afterwards, pushing the extension plate (314) to drive the support plate (312) and the top plate (39) to slide, pushing the push plate (34) by the top plate (39) to enable the inserted link (35) to be separated from the first jack (31), removing the connection between the rotating ring (21) and the rotating shaft (11), installing the first fixed block (316) and the second fixed block (321), pulling the first clamping block (318) and the second clamping block (323) to form temporary clamping, starting the main shaft to enable the fixed piece (2) to be static, pushing the screw thread (22) to drive the clamping block (27) to clamp in a centering mode, disassembling the temporary assembly, and resetting the inserted link (35);

S3, finally, starting the lathe spindle again to drive the rotating shaft (11), the fixing piece (2) and the branch pipe to synchronously rotate, starting the turning tool to turn along the outer circle surface of the branch pipe according to preset parameters after the rotating speed is stable, and finishing the outer circle machining of the branch pipe.