CN115069949A - Forming device and method for large-lead six-thread stator tube - Google Patents

Abstract

A forming device and a forming method for a large-lead six-thread stator pipe belong to the technical field of drilling tool part processing. The clamp comprises a base and is characterized in that one side of the base is provided with a clamp chuck, the clamp chuck can be driven to rotate by a motor and a speed reducer which are embedded in the base, the other side of the base is embedded with a hydraulic propulsion system, two fixing plates are fixed on two sides of the middle of the base, the clamp chuck and the hydraulic propulsion system penetrate through the fixing plates, a guide bar is connected between the two fixing plates, a support sleeve plate is arranged by penetrating through the guide bar, a support cylinder is fixed between the support sleeve plate and a push rod of the hydraulic propulsion system, the support sleeve plate can slide along the guide bar, and a ball die mechanism is connected in the support sleeve plate. The six-thread stator tube forming machine is easy to machine, high in efficiency and low in cost, can realize simultaneous forming of the inner section and the outer section of the six-thread stator tube, and can improve the mechanical property of the six-thread stator tube.

Description

Forming device and method for large-lead six-thread stator tube

Technical Field

The invention belongs to the technical field of drilling tool part processing, and particularly relates to a forming device and a forming method for a large-lead six-thread stator tube.

Background

The large-lead stator pipe is a core component of the screw drill, and the quality of the large-lead stator pipe directly influences the service life and the working efficiency of the screw drill. The six-thread stator pipe has the advantages of low rotating speed, large torque, easy speed regulation, controllable displacement per revolution and the like, and is widely applied. In addition, compared with single thread, the six-thread stator pipe has the characteristics of complex shape line, complex spiral meshing curved surface, high meshing precision and the like in appearance, and is difficult to process.

At present, the main processing technology of the large-lead six-thread stator pipe adopts a cast pipe blank, and then the pipe blank is machined and manufactured (such as turning a spiral line, milling the spiral line, milling a spiral line broach, screw tap metal plate teeth, spiral line cutting heads, milling the spiral line at high speed, space-free instant envelope milling and the like) to form an inner shape and an outer shape with the spiral line, and due to the limitation of tool consumption, a plurality of processes are needed, and the metal utilization rate is low. Meanwhile, for cutting the large-lead stator tube, most of machining tools are installed on special cantilever beam structure equipment, so that the machining process is not stable, vibration is easy to generate, and the stability of equipment machining is poor. Due to the characteristics of multiple working procedures, limited cutting amount and equipment structure, the machining efficiency is low, the machining precision is low, the production speed is low, and the production cost is high. In addition, because the raw material adopts a cast pipe, the quality of the finished stator pipe is directly influenced by defects such as shrinkage cavity, shrinkage porosity and the like, and meanwhile, if the spiral curved surfaces machined by the inner wall and the outer wall cannot be kept synchronous and consistent in the aspects of screw pitch and helix angle, the wall thickness of the produced stator pipe is not uniform, so that part of mechanical energy generated by friction impact of the rotor and the stator is converted into non-uniform heat energy at the position with unequal wall thickness of the rotor, the service life of a product is shortened, in addition, the fiber streamline of metal is cut off by cutting the inner shape, the fiber cut-off position is more easily corroded, the performance of the product is greatly influenced, and the service life of the product is also shortened.

Disclosure of Invention

The invention aims at the problems, makes up the defects of the prior art, and provides a forming device and a forming method for a large-lead six-thread stator tube; the six-thread stator tube forming machine is easy to machine, high in efficiency and low in cost, can realize simultaneous forming of the inner section and the outer section of the six-thread stator tube, and can improve the mechanical property of the six-thread stator tube.

In order to achieve the purpose, the invention adopts the following technical scheme.

The invention provides a forming device of a large-lead six-thread stator tube, which comprises a base and is characterized in that one side of the base is provided with a clamp chuck, the clamp chuck can be driven to rotate by a motor and a speed reducer which are embedded in the base, the other side of the base is embedded with a hydraulic propulsion system, two fixing plates are fixed on two sides of the middle part of the base, the clamp chuck and the hydraulic propulsion system both penetrate through the fixing plates, a guide bar is connected between the two fixing plates, a support sleeve plate is arranged by penetrating through the guide bar, a support cylinder is fixed between the support sleeve plate and a push rod of the hydraulic propulsion system, the support sleeve plate can slide along the guide bar, and a ball die mechanism is connected in the support sleeve plate.

Further, ball die mechanism includes the die panel, feeds screw, ball, supports and inlays iron, block, the die panel is connected support in the lagging, die panel middle part is the cylinder opening, six it is connected to feed the screw through screw circumference evenly distributed on the die panel and penetrate extremely in the cylinder opening, in the cylinder opening feed the screw tip equally divide do not with support and inlay iron plane cooperation, the ball is put into respectively to every support and is inlayed in the iron, every the other end of feeding the screw all with block threaded connection.

Furthermore, a telescopic petal-type core rod is connected to the push rod of the hydraulic propulsion system, the petal-type core rod extends inside the supporting cylinder, and the petal-type core rod is coaxial with the cylindrical opening of the die panel.

Still further, the jig chuck is provided with a cylindrical snap projection, and the cylindrical opening of the die plate is coaxial with the cylindrical snap projection.

Still further, one end of the supporting embedded iron, which is far away from the ball, is connected with a pressure sensor, and an output signal wire of the pressure sensor penetrates out of the corresponding holes formed in the feeding screw and the cover cap and then penetrates out of the supporting sleeve plate.

The invention also provides a forming method of the large-lead six-thread stator tube, which utilizes the forming device of the large-lead six-thread stator tube and comprises the following steps:

1) respectively loading the balls into each supporting embedded iron, filling a proper amount of graphite for lubrication, screwing on the corresponding ball caps, and adjusting the feeding screws until the balls reach the deformation amount required for the tube blank for the first time;

2) inserting the tube blank to be formed into the cylindrical clamping protrusion of the clamp chuck and fixing the tube blank;

3) adjusting the matching degree of the ball die mechanism, the motor for driving the clamp chuck to rotate and the speed reducer according to the thread pitch of a processed product, and adjusting the feed screw according to the feedback of the pressure sensor to enable each ball to reach a position with proper pressure;

4) the motor is started to enable the tube blank to rotate at a constant speed, the hydraulic propulsion system is started, the supporting cylinder is pushed through the push rod, the supporting sleeve plate is further pushed to drive the ball die mechanism to slowly move in a straight line, balls roll between the supporting embedded iron and the tube blank after reaching the tube blank, and the tube blank is rolled through the rotation of the tube blank and the rolling of the ball die mechanism and the petal-type core rod together, so that the tube blank is formed into a large-lead six-thread stator tube.

Further, the step 4 includes the following four stages:

the first stage is as follows: the motor drives the speed reducer to rotate the pipe blank, the hydraulic propulsion system is started, the ball die mechanism makes linear forward motion, the rolling ball is meshed with the pipe blank when in contact, the rolling pressure signals obtained by the six pressure sensors are analyzed, the deformation required by the feeding screw to the pipe blank is adjusted, and then the ball die mechanism continues to make linear forward motion;

and a second stage: continuously advancing, and continuously advancing the ball die mechanism, wherein when the ball die mechanism moves relative to the tube blank, the tube blank is processed into a required shape under the rolling action of six balls;

and a third stage: the hydraulic propulsion system enables the ball die mechanism to do linear backward movement, enables the pipe blank to rotate reversely at the same speed until the whole ball die is separated from the pipe blank, so that the processing of the part of the pass is completed, and the first stage to the third stage are repeated to process the pipe blank to a target shape;

a fourth stage: and extending the petal type core rod to enable the petal type core rod to be matched with the balls of the ball die mechanism, then starting a hydraulic propulsion system, the motor and the speed reducer, shaping and processing a product by a small deformation amount through the petal type core rod, finishing the product by a second small deformation amount, and finally enabling the ball die mechanism and the petal type core rod to move backwards and exit through the reverse rotation of the tube blank and the hydraulic propulsion system to complete the whole work of forming the large-lead six-thread stator tube from the tube blank.

The invention has the beneficial effects.

The independent ball die can form products with various specifications as long as the independent ball die has proper size and radial feeding amount, and the adaptability of the die is improved, so that the production efficiency is improved, the uniformity of the deformation direction can be realized, the thermal expansion amount of the independent ball die can be kept the same in the processing process, and the service life of the die is prolonged; the product can be conveniently applied with small deformation, thereby not only realizing shaping processing, but also improving the comprehensive mechanical property of the product; the supporting embedded iron and the feeding screw are respectively designed so as to be convenient for replacing the ball and the supporting embedded iron in time, thereby not only meeting the processing requirements of like products with different sizes and products with similar specifications, but also being convenient for replacing parts in time and economically and reducing the use and maintenance cost of equipment; the processing and forming are simple, and the rolling forming of the ball with continuous multiple passes and small local deformation can be realized, so that the manufacturing cost of the product is reduced.

Drawings

In order to make the technical problems, technical solutions and advantageous effects solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and the detailed description. It should be understood that the detailed description and specific examples, while indicating the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

Fig. 1 is an overall external structural view of the present invention.

Fig. 2 is a schematic cross-sectional structure of the present invention.

Fig. 3 is an external structural view of the ball die mechanism of the present invention.

Fig. 4 is a schematic sectional view of the ball die mechanism of the present invention.

Fig. 5 is a partial schematic view of the ball die mechanism of the present invention.

Fig. 6 is an external structural view of the petal type core rod of the present invention.

FIG. 7 is a fragmentary view of the finished large lead six thread stator tube of the present invention after machining.

The labels in the figure are: the device comprises a base 1, a clamp chuck 2, a motor 3, a speed reducer 4, a hydraulic propulsion system 5, a fixing plate 6, a guide rod 7, a support sleeve plate 8, a support cylinder 9, a ball die mechanism 10, a die insert plate 11, a feed screw 12, a ball 13, a support embedded iron 14, a cap 15, a cylindrical opening 16, a petal-type core rod 17, a cylindrical clamping bulge 18, a pressure sensor 19, an output signal wire 20 and a tube blank 21.

Detailed Description

Referring to the drawings, the embodiment provides a forming device of a large-lead six-thread stator tube, which comprises a base 1, wherein a clamp chuck 2 is arranged on one side of the base 1, the clamp chuck 2 can be driven to rotate by a motor 3 and a speed reducer 4 which are embedded in the base 1, the clamp chuck 2 is provided with a cylindrical clamping protrusion 18, and the end part of a tube blank 21 to be processed is inserted into the cylindrical clamping protrusion 18 and fixed during processing.

A hydraulic propulsion system 5 is embedded in the other side of the base 1, and the hydraulic propulsion system 5 is a conventional hydraulic structure with a push rod, which is not described herein.

Two fixing plates 6 are fixed on two sides of the middle of the base 1, and the two fixing plates 6 are used for improving the working stability. The fixture chuck 2 and the hydraulic propulsion system 5 both penetrate through the fixing plates 6, the guide bars 7 are connected between the two fixing plates 6, the guide bars 7 are arranged to penetrate through the supporting sleeve plates 8, the supporting sleeves 9 are fixed between the supporting sleeve plates 8 and push rods of the hydraulic propulsion system 5, the supporting sleeve plates 8 can slide along the guide bars 7, the supporting sleeves 9 are pushed through the hydraulic propulsion system 5, and the supporting sleeve plates 8 can be driven to slide on the guide bars 7.

The ball 13 die mechanism 10 is connected in the supporting sleeve plate 8, the ball 13 die mechanism 10 comprises a die insert plate 11, a feed screw 12, balls 13, a supporting embedded iron 14 and a cover cap 15, the die insert plate 11 is connected in the supporting sleeve plate 8 and can bear larger deformation force, a cylindrical opening 16 is formed in the middle of the die insert plate 11, and the cylindrical opening 16 of the die insert plate 11 is coaxial with a cylindrical clamping bulge 18. Six feeding screws 12 are connected to the die insert plate 11 in a circumferentially evenly distributed mode through threads and penetrate into the cylindrical opening 16, the end portions of the feeding screws 12 in the cylindrical opening 16 are matched with the supporting embedded irons 14 in a plane mode respectively, the balls 13 are placed into the supporting embedded irons 14 respectively, the tube blank 21 is directly rolled through the balls 13, the other end of each feeding screw 12 is connected with the cover cap 15 in a threaded mode, and the position of the feeding screw 12 on the die insert plate 11 is adjusted through the cover cap 15.

When the overall dimension of the product changes, products with other specifications can be formed only by properly changing the dimension and the radial feeding amount of the ball 13, so that the adaptability of the device is improved, the production efficiency is improved, and the service life of the die is prolonged. Rolling friction is adopted between the balls 13 in the ball 13 die mechanism 10 and the tube blank 21 to replace common sliding friction, so that friction force is greatly reduced, and energy is saved. And the uniformity of the deformation direction can be realized, and the thermal expansion amount can be kept the same in the processing process, so that the service life of the device is prolonged.

The ball 13 is the main forming tool, it and supports and inlays iron 14 as the main bearing component, also is the fragile component at the same time, supports and inlays iron 14 and feed screw 12 and design respectively to in time change ball 13 and support and inlay iron 14, both adapted to the demand to close specification, be convenient for in time economically change the part simultaneously, reduce the use and the maintenance cost of equipment.

One end of the supporting embedded iron 14, which is far away from the ball 13, is connected with a pressure sensor 19, an output signal line 20 of the pressure sensor 19 penetrates out of holes formed in the corresponding feeding screw 12 and the cap 15, then penetrates out of the supporting sleeve plate 8 and is connected with an industrial personal computer, before rolling, the contact pressure between the ball 13 and the tube blank 21 is sensed through the pressure sensor 19, and further the required deformation amount of the feeding screw 12 to the tube blank 21 is adjusted.

The push rod of the hydraulic propulsion system 5 is connected with a telescopic petal-type core rod 17, the petal-type core rod 17 extends in the supporting cylinder 9, the petal-type core rod 17 is coaxial with the cylindrical opening 16 of the die embedding plate 11, the petal-type core rod 17 is used for finally carrying out fine adjustment on the tube blank 21, small deformation can be conveniently applied to a product, fine shaping processing is achieved, and comprehensive mechanical properties of the product can be improved.

The invention also provides a forming method of the large-lead six-thread stator tube, which comprises the following steps of:

1) the balls 13 are respectively arranged in the supporting embedded irons 14, a proper amount of graphite is filled in the supporting embedded irons for lubrication, then corresponding ball 13 caps are screwed on, and the deformation amount required for the first time when the feeding screw 12 reaches the ball 13 to the tube blank 21 is adjusted;

2) inserting a tube blank 21 to be formed into the cylindrical clamping protrusion 18 of the clamp chuck 2 and fixing;

3) adjusting the matching degree of the ball 13 die mechanism 10, the motor 3 for driving the clamp chuck 2 to rotate and the speed reducer 4 according to the thread pitch of the processed product, and adjusting the feed screw 12 according to the feedback of the pressure sensor 19 to enable each ball 13 to reach a position with proper pressure;

4) the motor 3 is started to enable the tube blank 21 to rotate at a constant speed, the hydraulic propulsion system 5 is started, the supporting cylinder 9 is pushed through the push rod, the supporting sleeve plate 8 is further pushed to carry the ball 13 die mechanism 10 to slowly and linearly move forward, the balls 13 roll between the supporting embedded iron 14 and the tube blank 21 after reaching the tube blank 21, and the tube blank 21 is formed into the large-lead six-thread stator tube through the rotation of the tube blank 21 and the rolling of the ball 13 die mechanism 10 and the petal-type core rod 17 together.

The step 4) specifically comprises the following four stages:

the first stage is as follows: the motor 3 drives the speed reducer 4 to rotate the tube blank 21, the hydraulic propulsion system 5 is started, the ball 13 die mechanism 10 makes linear forward motion, the ball 13 is engaged when contacting with the tube blank 21, the rolling pressure signals obtained by the six pressure sensors 19 are analyzed, the deformation amount required by the feeding screw 12 to the tube blank 21 is adjusted, and then the ball 13 die mechanism 10 continues to make linear forward motion;

and a second stage: the rolling ball 13 mold mechanism 10 continues to advance, and when the rolling ball 13 mold mechanism 10 moves relative to the tube blank 21, the tube blank 21 is processed into a required shape under the rolling action of the six rolling balls 13;

and a third stage: the hydraulic propulsion system 5 makes the ball 13 die mechanism 10 do linear backward movement, so that the tube blank 21 rotates reversely at the same speed until the whole ball 13 die leaves the tube blank 21, thereby completing the processing of the parts of the pass, and the first stage to the third stage are repeated to process the tube blank 21 to a target shape;

a fourth stage: the petal type core rod 17 is extended out to be matched with the ball 13 of the ball 13 die mechanism 10, then the hydraulic propulsion system 5, the motor 3 and the speed reducer are started, the petal type core rod 17 performs shaping processing of small deformation on the product, finishing of small deformation is performed on the product for the second time, and finally the ball 13 die mechanism 10 and the petal type core rod 17 move backwards and exit through the reverse rotation of the tube blank 21 and the hydraulic propulsion system 5, so that the shape of the product is further ensured, the mechanical property of the product is improved, and the whole work of forming the tube blank 21 into the large-lead six-thread stator tube is completed.

Because rolling friction is adopted between the balls 13 in the ball 13 die mechanism 10 and the tube blank 21 to replace common sliding friction, the friction force is greatly reduced, and the energy is saved. Then, by adjusting the radial feeding distance of the ball 13, the required processing deformation of the product can be realized by adopting a multi-pass processing method, and by adopting the multi-pass rolling forming method of the continuous local small deformation of the ball 13, the equipment load is reduced, the energy is saved, the shape of the product can be further ensured, and meanwhile, the finishing forming procedure with the small deformation of the petal-type core rod 17 capable of radially stretching and retracting is designed, so that the comprehensive mechanical property of the product can be effectively improved.

It should be understood that the detailed description of the present invention is only for illustrating the present invention and is not limited by the technical solutions described in the embodiments of the present invention, and those skilled in the art should understand that the present invention can be modified or substituted equally to achieve the same technical effects; and are within the scope of the present invention as long as the requirements of use are met.

Claims (7)

1. The utility model provides a forming device of six screw thread stator pipes of big helical pitch, includes base (1), its characterized in that, one side of base (1) is provided with anchor clamps chuck (2), anchor clamps chuck (2) can be through embedding motor (3) and reduction gear (4) drive rotation in base (1), the opposite side of base (1) is embedded to have hydraulic propulsion system (5), the middle part both sides of base (1) are fixed with two fixed plates (6), anchor clamps chuck (2) with hydraulic propulsion system (5) all pass fixed plate (6), two be connected with guide bar (7) between fixed plate (6), pass guide bar (7) are provided with support sleeve board (8), support sleeve board (8) with be fixed with between the push rod of hydraulic propulsion system (5) support barrel (9), support sleeve board (8) can be followed guide bar (7) slide, and a ball (13) die mechanism (10) is connected in the support sleeve plate (8).

2. The apparatus of claim 1 wherein the stator tube is formed with six large-lead threads, the ball (13) die mechanism (10) comprises a die insert plate (11), a feed screw (12), a ball (13), a supporting embedded iron (14) and a cover cap (15), the die insert plate (11) is connected in the supporting sleeve plate (8), the middle part of the die insert plate (11) is a cylindrical opening (16), six feeding screws (12) are evenly distributed and connected on the die insert plate (11) in the circumferential direction through threads and penetrate into the cylindrical opening (16), the end parts of the feed screws (12) in the cylindrical openings (16) are respectively matched with the planes of the supporting embedded irons (14), the ball (13) is respectively placed into each supporting embedded iron (14), and the other end of each feeding screw (12) is in threaded connection with the cap (15).

3. A device for forming large-lead six-thread stator tubes according to claim 2, characterized in that a telescopic petaloid core rod (17) is connected to the push rod of the hydraulic propulsion system (5), said petaloid core rod (17) extending inside the supporting cylinder (9), said petaloid core rod (17) being coaxial with the cylindrical opening (16) of the die plate (11).

4. A forming device of a big lead six thread stator tube according to claim 3 characterized in that the fixture chuck (2) is provided with cylindrical sticking convex (18), the cylindrical opening (16) of the die plate (11) is coaxial with the cylindrical sticking convex (18).

5. The forming device of the big-lead six-thread stator tube as claimed in claim 4, wherein the end of the supporting embedded iron (14) far away from the ball (13) is connected with a pressure sensor (19), and an output signal wire (20) of the pressure sensor (19) is passed through the corresponding holes of the feeding screw (12) and the cap (15) and then passed through the supporting sleeve plate (8).

6. A method of forming a large lead six thread stator tube using the apparatus of claim 5, the method comprising the steps of:

1) respectively loading the balls (13) into the supporting embedded irons (14), filling a proper amount of graphite for lubrication, screwing corresponding ball (13) caps, and adjusting the feed screw (12) until the balls (13) reach the deformation amount required for the first time of the tube blank (21);

2) inserting a tube blank (21) to be formed into the cylindrical clamping protrusion (18) of the clamp chuck (2) and fixing the tube blank;

3) adjusting the matching degree of the ball (13) die mechanism (10) with the motor (3) and the speed reducer (4) which drive the clamp chuck (2) to rotate according to the thread pitch of a processed product, and adjusting the feed screw (12) according to the feedback of the pressure sensor (19) to enable each ball (13) to reach a position with proper pressure;

4) the motor (3) is started to enable the tube blank (21) to rotate at a constant speed, the hydraulic propulsion system (5) is started, the supporting cylinder (9) is pushed through the push rod, the supporting sleeve plate (8) is further pushed to drive the ball (13) die mechanism (10) to slowly move forwards in a straight line, the ball (13) reaches the tube blank (21) and then rolls between the supporting embedded iron (14) and the tube blank (21), and the tube blank (21) is formed into a large-lead six-thread stator tube through rotation of the tube blank (21) and rolling of the ball (13) die mechanism (10) and the petal-type core rod (17) on the tube blank (21) together.

7. The method of forming a high-lead six-thread stator tube as claimed in claim 6 wherein said step 4) comprises the following four stages:

the first stage is as follows: the motor (3) drives the speed reducer (4) to rotate the tube blank (21), the hydraulic propulsion system (5) is started, the ball (13) die mechanism (10) makes linear forward motion, when the ball (13) is in contact with the tube blank (21), biting is achieved, rolling pressure signals obtained by the six pressure sensors (19) are analyzed, the deformation amount required by the feeding screw (12) to the tube blank (21) is adjusted, and then the ball (13) die mechanism (10) continues to make linear forward motion;

and a second stage: the rolling device is continuously pushed, the ball (13) die mechanism (10) continuously advances, and when the ball (13) die mechanism (10) moves relative to the tube blank (21), the tube blank (21) is processed into a required shape under the rolling action of six balls (13);

and a third stage: the hydraulic propulsion system (5) enables the ball (13) die mechanism (10) to do linear retreating movement, the tube blank (21) rotates reversely at the same speed until the whole ball (13) die is separated from the tube blank (21), and therefore the processing of the pass of parts is completed, and the first stage to the third stage are repeated to process the tube blank (21) to a target shape;

a fourth stage: and (3) extending the petal type core rod (17) to be matched with the balls (13) of the ball (13) die mechanism (10), then starting the hydraulic propulsion system (5), the motor (3) and the speed reducer, shaping the product by a small deformation amount through the petal type core rod (17), finishing the product by a second small deformation amount, and finally enabling the ball (13) die mechanism (10) and the petal type core rod (17) to move backwards and withdraw through the reverse rotation of the tube blank (21) and the hydraulic propulsion system (5) to finish the whole work of forming the tube blank (21) into the large-lead six-thread stator tube.

Images