CN111842613A - Continuous processing die and forming method of chair leg pipe - Google Patents

Abstract

This invention belongs to the field of mold technology, and particularly relates to a continuous processing mold for chair leg tubes. It solves the problems of unreasonable design in existing technologies. This continuous processing mold for chair leg tubes includes: a tube placement station arranged sequentially according to the processing order, used to place unprocessed tubes; a tube forming station, used to form both ends of the tube; a tube length fixing station, used to cut off excess length from both ends of the tube; a tube finishing station, used to finish the tube after the length fixing station to obtain the finished chair leg tube; and a tube transfer mechanism, used to move the tubes from one station to the next according to the station sequence. The advantages of this application are: a more reasonable design and improved production efficiency.

Description

Continuous processing die and forming method of chair leg pipe

technical field

The invention belongs to the technical field of molds, and in particular relates to a continuous processing mold and a molding method of a chair leg pipe fitting.

Background technique

The chair legs have five-star chair feet, and one of the five-star chair feet has a welding connection between the middle tube and the five single legs.

In order to facilitate the installation of the roller and improve the structural strength of the single foot, the arc-shaped section is generally formed at the outer end of the single foot. Shaped oval for easy connection to the center seat.

At present, the forming of this single piece needs to go through multiple processes, such as forming-fixing and shaping, etc. These multiple processes are generally processed on different equipment by independent stations. This method is the most traditional method. method, the efficiency is lower, and the consistency of the product is also poor.

SUMMARY OF THE INVENTION

The purpose of the present invention is to address the above problems, and to provide a continuous processing die and a forming method for a chair leg pipe fitting that can solve the above technical problems.

To achieve the above object, the present invention has adopted the following technical solutions:

The continuous processing die of the chair leg fittings includes a series of

Pipe fitting placement station for placing unprocessed pipe fittings;

The pipe forming station is used to form both ends of the pipe;

The pipe fitting fixed-length station is used to cut off the excess length of the two ends of the pipe fitting;

The pipe fitting finishing station is used to finish the pipe fittings after the pipe fitting lengthening station to obtain the finished chair foot pipe fittings;

The pipe fitting moving mechanism is used to move the above-mentioned pipe fittings from the previous station to the next station according to the station sequence.

In the above-mentioned continuous processing die for the pipe fittings of the chair legs, the pipe fitting fixing station includes a front fixing length station and a rear fixing length station. The fixed-length station is used to cut off the excess length of the end of the formed oval section of the pipe.

In the above-mentioned continuous processing mold for the pipe fittings of the chair legs, the pipe fitting placement station, the pipe fitting forming station, the pipe fitting forming station, the pipe fitting lengthening station and the pipe fitting finishing station are arranged on the fixing plate.

In the above-mentioned continuous processing mold for the leg fittings of the chair, the lower surface of the fixing plate is connected with a bottom plate through a supporting mechanism.

In the above-mentioned continuous processing mold for chair leg pipe fittings, the pipe fitting moving mechanism includes a moving seat fixed on the upper surface of the bottom plate, and the moving direction of the moving seat is the sequential arrangement direction of the above-mentioned stations, in the central area of the fixed plate There is a rectangular through hole, a lift drive through the rectangular through hole is arranged on the movable seat, and a moving frame is connected to the lift driver. The moving frame is located above the surface of the fixed plate. For the pipe fittings, the movement of the moving base drives the moving frame to move the pipe fittings from the previous work station to the next work station.

In the above-mentioned continuous processing mold for chair leg pipe fittings, the pipe fitting placement station includes a lower static mold for placing and a lifting movable mold above the lower static mold for placement. Tube clamping on static die.

In the above-mentioned continuous processing mold for chair leg pipe fittings, the pipe fitting forming station includes a lower forming punch and a lift forming concave die located above the lower forming punch, and the lift forming concave die is lowered to cooperate with the lower forming punch to form the lower moulding punch. One end of the pipe is formed.

In the above-mentioned continuous processing mold for chair leg pipe fittings, the front fixed-length station includes a lower support die supported in the middle of the pipe fitting, an upper lift die located above the lower support die, and the upper lift die is lowered to cooperate with the lower support die to move the pipe fittings. Constraining and fixing, it also includes a first vertical block located at the end of the pipe piece away from the formed end, passing through the first vertical block and extending relative to the first horizontally extending stepped shaft of the first vertical block, and the first horizontally extending stepped shaft The first driver is connected with the first driver and the first driver drives the first horizontally extending stepped shaft to be inserted into the inside of the pipe fitting away from the formed end, and also includes an inner concave fixed die located inside the formed end of the pipe, and an outer punch located outside the formed end of the pipe Cutting translation die, the side of the outer punching translation die close to the pipe fitting is provided with an arc-shaped concave surface that matches the outer side of the formed end of the pipe fitting, and the outer punching translation die is connected with the first translation driver. The concave stationary die is mated and the first translation drive drives the outer die cutting translation die to move toward the formed end of the tube and cut off excess length.

In the above-mentioned continuous processing die for the pipe fittings of chair legs, the rear fixing station includes a horizontal end positioning plate located at one end of the pipe fitting processed by the front fixing station, and the end face of one end of the pipe fitting processed by the front fixing station abuts against the The upper surface of the horizontal end positioning plate, and the concave-convex holding device that holds the end of the pipe after being processed by the front fixed-length station, and the second fixed die at the other end of the pipe, and the lifting pressure above the second fixed die The clamping die is a driving upper die that is located above the lifting and pressing die and is vertically slidably connected to the lifting and pressing die. A vertical punching knife that is vertically slidably connected to the lifting and pressing die is pierced on the lifting and pressing die. The cutting edge of the punching knife faces down, and the upper end of the vertical punching knife is connected with the driving upper die, and also includes an inner concave surface reference die located inside one end of the circular arc segment of the pipe fitting, and an outer convex surface holding die located outside the inner concave reference die. Hold the die and connect the second driver.

In the above-mentioned continuous processing die for the pipe of the chair leg, the pipe finishing station comprises a second vertical block and a finishing shaft which is penetrated on the second vertical block and can move horizontally relative to the second vertical block One end of the finishing shaft extends into the inside of the end of the pipe that is far away from the forming process through the second translation drive, and also includes an inner concave finishing die located inside one end of the circular arc segment of the pipe, and an outer finishing die located outside the inner concave finishing die. The convex finishing die, the outer convex finishing die and the third driver are connected.

A continuous molding method for a chair leg tube, the method adopts the continuous molding die for a chair leg tube, and includes the following steps:

S1. Place the unprocessed pipe fittings on the pipe fitting placement station;

S2. Move the unprocessed pipe fitting on the pipe fitting placement station and transfer it to the pipe fitting forming station. The pipe fitting forming station shapes both ends of the unprocessed pipe fitting, and processes one end of the pipe fitting into an arc shape, and the other end is processed and formed. elliptical;

S3, transfer the pipe fitting processed in step S2 to the pipe fitting fixed-length station, first cut off the excess length of the end of the circular arc segment of the pipe fitting, and then cut off the excess length of the elliptical segment of the pipe fitting;

S4, transfer the pipe fitting in step S3 to the pipe fitting finishing station, and the pipe fitting finishing station reshapes the circular arc segment and the elliptical segment of the pipe fitting synchronously, that is, completes the pipe fitting forming process.

Compared with the existing technology, the advantages of the continuous processing die for the leg fittings are:

Using the integrated method, it can omit the scheduling process between equipment and equipment, and can improve production efficiency, greatly reduce the number of operators, and reduce the production labor cost of the enterprise. At the same time, interval and continuous processing, it can Improve the consistency of product processing, stable product processing quality and meet the production requirements of enterprises. In addition, it can also be applied to large-scale production and processing, and the design is more reasonable.

Description of drawings

FIG. 1 is a schematic top-view structural diagram of a processing die provided by the present invention.

FIG. 2 is a schematic diagram of the three-dimensional structure of the processing die provided by the present invention.

3 is a schematic structural diagram of a processing die provided by the present invention.

FIG. 4 is a schematic diagram of the state in which there are pipe fittings in each station of the processing die provided by the present invention.

In the figure, the pipe fitting placement station 1, the lower static die 10, the lifting movable die 11, the pipe fitting forming station 2, the lower forming punch 20, the lifting forming concave die 21, the lower elliptical die 22, the upper elliptical die 23, the mandrel 24. Pipe fixing station 3, front fixing station 30, lower supporting die 301, upper lifting die 302, first vertical block 303, first horizontally extending stepped shaft 304, first driver 305, outer punching translation die 306 , the inner concave fixed die 307, the first translation driver 308, the rear fixing station 31, the horizontal end positioning plate 310, the concave and convex clamping device 311, the second fixed die 312, the lifting and pressing die 313, the driving upper die 314, Vertical punching knife 315, inner concave reference die 316, outer convex clamping die 317, second driver 318, pipe finishing station 4, second vertical block 40, finishing shaft 41, second translation driver 42, inner side Concave finishing die 43, convex finishing die 44, third driver 45, pipe material moving mechanism 5, moving seat 50, lifting driver 51, material moving frame 52, guide rail 53, fixed plate 6, rectangular through hole 60, bottom plate 7.

Detailed ways

The following are specific embodiments of the invention and combined with the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

As shown in Fig. 1 and Fig. 4, the continuous processing die for the leg fittings of the chair includes a fitting placement station 1 arranged in sequence according to the processing sequence, for placing the unprocessed fittings;

Pipe fitting forming station 2, used to form both ends of the pipe fitting;

Pipe fitting fixing station 3, used to cut off the excess length of both ends of the pipe fitting;

The pipe fitting finishing station 4 is used for finishing the pipe fittings after the pipe fitting lengthening station 3 to obtain the finished chair foot pipe fittings;

The pipe fitting moving mechanism 5 is used to move the above-mentioned pipe fittings from the previous station to the next station according to the station sequence.

The pipe fitting placement station 1 , the pipe fitting forming station 2 , the pipe fitting forming station 2 , the pipe fitting lengthening station 3 and the pipe fitting finishing station 4 are arranged on the fixing plate 6 .

As shown in Figure 2 and Figure 3,

The bottom surface of the fixing plate 6 is connected with a bottom plate 7 through a supporting mechanism.

The supporting mechanism includes two rows of supporting plates arranged on the upper surface of the bottom plate 7, and the pipe-piece moving mechanism 5 is placed between the two rows of supporting plates.

Using the integrated method, it can omit the scheduling process between equipment and equipment, and can improve production efficiency, greatly reduce the number of operators, and reduce the production labor cost of the enterprise. At the same time, interval and continuous processing, it can Improve the consistency of product processing, stable product processing quality and meet the production requirements of enterprises. In addition, it can also be applied to large-scale production and processing, and the design is more reasonable.

Further, the pipe fitting placement station 1 includes a lower static mold 10 for placing and a lifting and moving mold 11 located above the lower static mold 10. The lifting and moving mold 11 descends to cooperate with the placing lower static mold 10 to place the pipe fittings on the lower static mold 10. Clamp.

Further, the pipe fitting forming station 2 includes a lower forming punch 20 and a lift forming concave die 21 located above the lower forming punch 20. The lift forming concave die 21 is connected to the lifting head of the punch press, and the lift forming concave die 21 descends and the lower forming convex mould 21 is lowered. The die 20 cooperates to form one end of the pipe into a circular arc shape. A vertical guide structure is provided between the lifting forming die 21 and the lower forming punch 20 . The vertical guide structure here includes two vertical guide rods arranged on the lower forming punch 20 . There are guide holes into which the upper ends of the vertical guide rods are inserted one by one, so as to improve the stability of the lifting and lowering forming die 21 .

Next, a vertical guide plate 25 is provided at one end of the lower forming punch 20 near the circular arc section of the pipe, and a guide groove 26 slidably connected to the vertical guide plate 25 is provided on the lift forming die 21 to further improve the lift forming process. The lifting and lowering stability of the die 21.

Secondly, the pipe fitting forming station 2 also includes an elliptical forming mechanism for processing the pipe fitting away from the end of the circular arc segment to be formed into an elliptical shape. 23. The upper elliptical die 23 is connected with the lifting head of the punch press, and one end extends from the outer end of the lower elliptical die 22 to the mandrel 24 in the lower elliptical die 22. The mandrel 24 is connected with the mandrel driving cylinder or oil cylinder, and one end of the unprocessed pipe fitting is The lower elliptical die 22 is placed, the upper elliptical die 23 is lowered to match the lower elliptical die 22, and the mandrel 24 is inserted into the unprocessed pipe fitting to provide force support during the forming process of the pipe fitting.

During processing, the elliptical segment is processed first, then the mandrel is pulled out and the upper elliptical die 23 is properly loosened, and then the lower forming punch 20 and the lifting forming die 21 begin to process the arc segment. During the arc segment processing, due to the bending of the pipe. The ellipse segment is released from the lower ellipse die 22 to facilitate the machining of the arc segment.

Further, the pipe fixing station 3 includes a front fixing station 30 and a rear fixing station 31. The front fixing station 30 is used to cut off the excess length of the circular arc segment after the pipe fitting is formed, and the rear fixing station 31 is used for pipe fittings. The excess length at the end of the formed oval segment is cut off.

Specifically, the front fixing station 30 includes a lower support die 301 supported in the middle of the pipe fitting, an upper lift die 302 located above the lower support die 301, the upper lift die 302 descends and cooperates with the lower support die 301 to constrain and fix the pipe fitting, and the upper lift die 302 is lowered. The lower surface of 302 is connected with two mutually parallel confinement columns 309, the top of the lower support die 301 is provided with a cantilever support portion 3010, the distance formed between the two confinement columns 309 is slightly larger than the width of the cantilever support portion 3010, and the upper die is lifted and lowered. After 302 is lowered, the cantilever support portion 3010 is located between the two restriction columns 309, thereby forming a restriction.

It also includes a first vertical block 303 located at the end of the pipe that is far away from the formed end, which is penetrated on the first vertical block 303 and can extend relative to the first vertical block 303. The shaft 304 is connected with the first driver 305, and the first driver 305 drives the first horizontally extending stepped shaft 304 to be inserted into the inside of the pipe fitting away from the formed end. The first driver 305 is an air cylinder or an oil cylinder, and also includes an inner side located inside the formed end of the pipe fitting. The concave fixed die 307, the underside of the inner concave fixed die 307 is provided with a chamfer to provide an edge-cutting tool avoidance, and an outer die-cutting translation die 306 located on the outside of one end of the pipe to be formed, the outer die-cutting translation die 306 is close to the pipe One side is provided with an arc-shaped concave surface that matches the outer side of the formed end of the pipe fitting, and the outer die-cutting translation die 306 is connected with the first translation driver 308. The first translation driver 308 is an air cylinder or an oil cylinder. The concave fixed die 307 mates and the first translation drive 308 drives the outer die cutting translation die 306 to move toward the end of the tube being formed and cut off the excess length.

A first horizontal guide structure is provided between the outer punching translation die 306 and the fixing plate. The first horizontal guide structure includes two first guide rods passing through the fixed seat of the fixed plate, and the outer punching translation die 306 is provided with first guide holes for the first guide rods to be inserted one by one, so as to improve the The smoothness and stability of the movement of the outer die-cutting translation die 306 .

Secondly, the first inclined slope surface is provided on the side of the inner concave fixed mold 307 close to the lower support mold 301, and the lower end of each restricting column 309 close to the inner concave fixed mold 307 is provided with an inclined slope surface 2 3090. The slope 1 and the inclined slope 2 are matched to indicate that the upper lifting die 302 is lowered in place.

The first horizontally extending stepped shaft 304 is inserted into the elliptical section so as to locate one end of the pipe fitting, so as to avoid axial displacement of the pipe fitting due to axial impact on the pipe fitting when the residual material is removed. The maximum outer diameter of the first horizontally extending stepped shaft 304 is larger than the inner diameter of the elliptical section of the pipe fitting, and at the same time, the first horizontally extending stepped shaft 304 can play a certain role in shaping.

Secondly, the rear fixing station 31 includes a horizontal end positioning plate 310 located at one end of the pipe fitting processed by the front fixing station 30, and the end face of the pipe fitting after being processed by the front fixing station 30 abuts on the upper surface of the horizontal end positioning plate 310, And the concave-convex holding device 311 for holding the end of the pipe fitting after being processed by the front fixed-length station 30, the concave-convex holding device 311 includes an inner arc convex surface that fits the inner concave surface of the formed end of the pipe fitting, and is located outside the inner arc convex surface. The outer translation block is provided with an outer arc-shaped concave surface that fits with the outer convex surface of the formed end of the pipe fitting, and the outer translation block is connected with a cylinder or an oil cylinder, so as to hold the formed end of the pipe fitting tightly, and the other end of the pipe fitting is located at the other end of the pipe fitting. The second fixed female die 312, the lifting and pressing die 313 located above the second fixed female die 312, the driving upper die 314 located above the lifting and pressing die 313 and vertically slidingly connected with the lifting and pressing die 313, the driving upper die 314 There are two vertical guide rods on it, and the lifting and pressing die 313 is provided with guide holes for the vertical guide rods to be inserted one by one, so as to ensure that the lifting and pressing die 313 is connected to the driving upper die 314 after being pressed. The vertical punching knife 315 on the upper part is vertically lifted, and the upper die 314 is driven to connect with the lifting head of the punch press, and the vertical punching knife 315 which is vertically slidably connected to the lifting and pressing die 313 is pierced on the lifting and pressing die 313. , the fixing plate is provided with an avoidance hole for the lower end of the vertical punching knife 315 to enter, the avoidance hole can be used for avoidance and blanking of waste materials, the blade of the vertical punching knife 315 is facing down, and the upper end of the vertical punching knife 315 is driven upward. The mold 314 is connected, and also includes an inner concave reference mold 316 located on the inner side of one end of the circular arc segment of the pipe fitting, and an outer convex surface holding mold 317 located outside the inner concave reference mold 316. The outer convex surface holding mold 317 is connected with the second driver 318. The second driver 318 is an air cylinder or an oil cylinder.

Secondly, a second guide structure is provided between the outer convex surface holding die 317 and the fixing plate. The second guide structure includes two second guide blocks fixed on the fixing plate. A concave-shaped guide space is formed between the second guide blocks, and the outer convex surface holding mold 317 is placed in the concave-shaped guide space and the two are in clearance fit.

Further, the pipe finishing station 4 includes a second vertical block 40 and a finishing shaft 41 which is penetrated on the second vertical block 40 and can move horizontally relative to the second vertical block 40. One end of the finishing shaft 41 The second translation driver 42 extends into the inside of the elliptical segment of the pipe, and further includes an inner concave finishing die 43 located inside one end of the circular arc segment of the pipe, and an outer convex finishing die 44 located outside the inner concave finishing die 43. The sizing die 44 is connected to the third driver 45 . Both the second translation driver 42 and the third driver 45 are air cylinders or oil cylinders.

Secondly, a lower elliptical receiving die 46 located below the finishing shaft 41 and a lower pressing elliptical die 47 located above the lower elliptical receiving die 46 are arranged on the fixed plate. segment compression.

The finishing shaft 41 is finally inserted into the elliptical section of the pipe, ensuring the quality of the finishing.

In addition, a third guide structure is provided between the outer convex surface finishing die 44 and the fixing plate, and the structure of the third guide structure is the same as that of the second guide structure.

Further, the pipe fitting moving mechanism 5 includes a moving seat 50 fixed on the upper surface of the bottom plate 7, and the moving direction of the moving seat 50 is the sequential arrangement direction of the above-mentioned stations, and a rectangular through hole 60 is provided in the central area of the fixed plate 6, The moving base 50 is provided with a lifting driver 51 penetrating the rectangular through hole 60, and a moving frame 52 connected to the lifting driver 51. The moving frame 52 is located above the upper surface of the fixed plate 6, and the moving frame 52 can be lifted and lowered to obtain pipe fittings. and release the pipe, the moving base 50 moves the moving frame 52 to move the pipe to move the pipe from the previous work station to the next work station.

During the forming process, the material moving frame 52 at this time is located below the middle of the pipe, and when the material needs to be moved, the material moving frame 52 at this time is driven to rise.

The moving frame 52 includes a strip beam, and five receiving slots are arranged on the upper surface of the strip beam, and the receiving slots are located in the middle of the pipe fitting to ensure that the pipe fitting can be stably lifted, translated and lowered.

The lift driver 51 is an air cylinder or an oil cylinder with multiple telescopic rods. In order to avoid the instability phenomenon of the single telescopic rod also needs to be designed.

Secondly, the movable seat 50 is slidably arranged on the guide rail 53 on the upper surface of the bottom plate 7, and the upper surface of the bottom plate 7 is provided with an air cylinder or an oil cylinder connected with the movable seat 50, and the moving material of the water can realize the displacement of lifting and translation in two directions. .

The lifting and lowering of this embodiment are all realized by the lifting head on the punching machine. Of course, a horizontal connecting block can be installed on the lifting head to facilitate connection with the components that need to be lifted and lowered in this embodiment to form unified lifting control.

A continuous molding method for a chair leg tube, the method adopts the continuous molding die for a chair leg tube, and includes the following steps:

S1. Place the unprocessed pipe fittings on the pipe fitting placement station;

S2. Move the unprocessed pipe fitting on the pipe fitting placement station and transfer it to the pipe fitting forming station. The pipe fitting forming station shapes both ends of the unprocessed pipe fitting, and processes one end of the pipe fitting into an arc shape, and the other end is processed and formed. elliptical;

S3, transfer the pipe fitting processed in step S2 to the pipe fitting fixed-length station, first cut off the excess length of the end of the circular arc segment of the pipe fitting, and then cut off the excess length of the elliptical segment of the pipe fitting;

S4, transfer the pipe fitting in step S3 to the pipe fitting finishing station, and the pipe fitting finishing station reshapes the circular arc segment and the elliptical segment of the pipe fitting synchronously, that is, completes the pipe fitting forming process.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which the present invention pertains can make various modifications or additions to the described specific embodiments or substitute in similar manners, but will not deviate from the spirit of the present invention or go beyond the definition of the appended claims range.

Claims (10)

1. The continuous processing die for chair leg pipe fittings is characterized by comprising a plurality of processing dies which are sequentially arranged according to the processing sequence

A pipe placing station (1) for placing unprocessed pipes;

the pipe fitting forming station (2) is used for forming two ends of the pipe fitting, one end of the pipe fitting is formed into an arc shape, and the other end of the pipe fitting is formed into an oval shape;

the pipe fitting length fixing station (3) is used for cutting off the redundant length of the end parts of the two ends of the pipe fitting;

the pipe finishing station (4) is used for finishing the pipe after the pipe length fixing station (3) to obtain a chair leg pipe finished product;

and the pipe moving mechanism (5) is used for moving the pipe from the previous station to the next station according to the station sequence.

2. The continuous forming die for the chair leg pipe fittings according to the claim 1, wherein the pipe fitting length fixing station (3) comprises a front length fixing station (30) and a rear length fixing station (31), the front length fixing station (30) is used for cutting off the excess length of the circular arc section after the pipe fitting is formed, and the rear length fixing station (31) is used for cutting off the excess length of the end part of the oval section after the pipe fitting is formed.

3. The continuous forming die for the chair leg pipe fittings according to the claim 1, wherein the pipe fitting placing station (1), the pipe fitting forming station (2), the pipe fitting length fixing station (3) and the pipe fitting finishing station (4) are arranged on the fixing plate (6); the lower surface of the fixing plate (6) is connected with a bottom plate (7) through a supporting mechanism.

4. The continuous forming die for chair leg pipe fittings according to claim 3, wherein the pipe fitting moving mechanism (5) comprises a moving seat (50) fixed on the upper surface of the bottom plate (7), and the moving direction of the moving seat (50) is the sequential arrangement direction of the stations, a rectangular through hole (60) is arranged in the central region of the fixed plate (6), a lifting driver (51) penetrating through the rectangular through hole (60) is arranged on the moving seat (50), and a moving frame (52) connected to the lifting driver (51), the moving frame (52) is located above the upper surface of the fixed plate (6), the moving frame (52) can be lifted to take the pipe fitting and release the pipe fitting, and the moving seat (50) moves to drive the moving frame (52) to move the pipe fitting from the previous station to the next station.

5. The continuous forming die for the chair leg pipe fittings according to claim 1, wherein the pipe fitting placing station (1) comprises a lower static die (10) and a movable lifting die (11) positioned above the lower static die (10), and the movable lifting die (11) descends to cooperate with the lower static die (10) so as to clamp the pipe fitting placed on the lower static die (10).

6. The continuous forming die for the chair leg pipe fittings according to the claim 1, wherein the pipe fitting forming station (2) comprises a lower forming male die (20) and a lifting forming female die (21) positioned above the lower forming male die (20), and the lifting forming female die (21) descends to be matched with the lower forming male die (20) so as to form one end of the pipe fitting into a circular arc shape; the pipe fitting forming machine also comprises an ellipse forming mechanism which is used for processing one end of the pipe fitting, which is far away from the formed arc section, into an ellipse; the elliptical forming mechanism comprises a lower elliptical die, an upper elliptical die and a mandrel, wherein the upper elliptical die is positioned above the lower elliptical die, one end of the mandrel extends into the lower elliptical die from the outer end of the lower elliptical die, the mandrel is connected with a mandrel driving cylinder or an oil cylinder, one end of a raw pipe fitting is placed into the lower elliptical die, and the upper elliptical die descends to be matched with the lower elliptical die.

7. The continuous forming die for chair leg pipe fittings according to claim 2, wherein the front length fixing station (30) comprises a lower supporting die (301) supported in the middle of the pipe fitting, an upper lifting die (302) positioned above the lower supporting die (301), the upper lifting die (302) descends to cooperate with the lower supporting die (301) to restrain and fix the pipe fitting, a first vertical block (303) positioned at one end of the pipe fitting far away from the formed end of the pipe fitting, a first horizontal extending stepped shaft (304) which is arranged on the first vertical block (303) in a penetrating way and can be opposite to the first vertical block (303), the first horizontal extending stepped shaft (304) is connected with a first driver (305) and the first driver (305) drives the first horizontal extending stepped shaft (304) to be inserted into the end of the pipe fitting far away from the formed end of the pipe fitting, an inner side fixed die (307) positioned at the inner side of the formed end of the pipe fitting, and an outer punching translation die (306) positioned at the outer side of the formed end of the pipe fitting, an arc concave surface matched with the outer side of the formed end of the pipe fitting is arranged on one side, close to the pipe fitting, of the outer punching translation die (306), the outer punching translation die (306) is connected with a first translation driver (308), the inner concave surface of the formed end of the pipe fitting is matched with the inner concave surface fixed die (307), and the first translation driver (308) drives the outer punching translation die (306) to move towards the formed end of the pipe fitting and cut off the excess length.

8. The continuous forming die for the chair leg pipe fittings according to claim 7, wherein the rear length fixing station (31) comprises a horizontal end positioning plate (310) positioned at one end of the pipe fitting processed by the front length fixing station (30), one end surface of the pipe fitting processed by the front length fixing station (30) is abutted against the upper surface of the horizontal end positioning plate (310), a concave-convex clasping device (311) clasping one end of the pipe fitting processed by the front length fixing station (30), a second fixed female die (312) positioned at the other end of the pipe fitting, a lifting compression die (313) positioned above the second fixed female die (312), a driving upper die (314) positioned above the lifting compression die (313) and vertically and slidably connected with the lifting compression die (313), and a vertical stamping knife (315) vertically and slidably connected with the lifting compression die (313) is arranged on the lifting compression die (313) in a penetrating manner, the cutting edge of the vertical stamping knife (315) faces downwards, the upper end of the vertical stamping knife (315) is connected with the driving upper die (314), the vertical stamping device further comprises an inner side concave surface reference die (316) located on the inner side of one end of the circular arc section of the pipe fitting, an outer convex surface clasping die (317) located on the outer side of the inner side concave surface reference die (316), and the outer convex surface clasping die (317) is connected with the second driver (318).

9. The continuous forming die for the chair leg pipe fittings according to claim 1, wherein the pipe fitting finishing station (4) comprises a second vertical block (40) and a finishing shaft (41) which is arranged on the second vertical block (40) in a penetrating way and can horizontally move relative to the second vertical block (40), one end of the finishing shaft (41) extends into the pipe fitting oval section through a second translation driver (42), the continuous forming die further comprises an inner concave finishing die (43) which is positioned at the inner side of one end of the pipe fitting circular arc section, and an outer convex finishing die (44) which is positioned at the outer side of the inner concave finishing die (43), and the outer convex finishing die (44) is connected with a third driver (45).

10. The chair leg pipe fitting continuous forming method is characterized in that the chair leg pipe fitting continuous forming method adopts the chair leg pipe fitting continuous forming die of any one of claims 1 to 9, and comprises the following steps:

s1, placing the unprocessed pipe fitting on a pipe fitting placing station;

s2, moving the unprocessed pipe on the pipe placing station and transferring the unprocessed pipe to a pipe forming station, wherein the pipe forming station forms and processes two ends of the unprocessed pipe, and one end of the pipe is formed into an arc shape, and the other end of the pipe is formed into an oval shape;

s3, transferring the pipe processed in the step S2 to a pipe fixed-length station, cutting off the redundant length of the end part of the arc section of the pipe, and cutting off the redundant length of the oval section of the pipe;

and S4, transferring the pipe fitting obtained in the step S3 to a pipe fitting finishing station, and synchronously finishing the arc section and the oval section of the pipe fitting by the pipe fitting finishing station, namely finishing the forming processing of the pipe fitting.

Images