Stretching pipe cantilever side punching small-batch production line

Abstract

The invention discloses a stretching pipe cantilever side punching small-batch production line, which is used for punching a cylindrical workpiece with a side hole, and comprises a vertical punching section for receiving a circular material fed by a vibration disc and stretching and punching the circular material to process a cylindrical semi-finished product; in the side punching section, a cantilever support is inserted into the semi-finished product, and side punching is conducted on the semi-finished product; the device further comprises a horizontally-arranged transferring frame, at least one overturning clamp is arranged on the transferring frame and used for overturning the semi-finished products by 90 degrees, and openings of the semi-finished products face backwards. The stamping device has the beneficial effects that a workpiece is overturned by 90 degrees through the overturning clamp, then inner support is provided for the workpiece through the cantilever support, and the workpiece is prevented from collapsing in the stamping process; in the front-back moving process of the guide column, the rear limiting rod is driven to limit the workpiece from the rear portion of the workpiece, and the workpiece is prevented from moving. The device is simple in structure, convenient to implement, low in cost and suitable for small-batch side punching production lines.

Description

Technical Field

[0001] This invention relates to the field of stamping, and more particularly to a small-batch production line for cantilever side stamping of drawn tubes. Background Technology

[0002] Utilizing the ductility of sheet metal to stamp cup-shaped workpieces is a mature technology. Each stamping station includes a die and an upper or lower punch. When the punch enters the die, it stamps or shears the sheet metal to obtain the desired shape. When the workpiece has holes on its side, the traditional approach is to transfer the workpiece to another processing station for separate processing. This increases the processing cycle, adds transfer steps, and is inefficient. The applicant has disclosed a structure in patents such as 2011104582953 and 2023111772495 that uses a wedge-shaped die to achieve horizontal movement of the side punch when the upper and lower dies are closed, thus realizing a side punch. However, this structure requires redesigning the die, resulting in high costs, and is usually only used for mass production. How to design an efficient and simple implementation method for small-batch processing is a pressing technical problem that needs to be solved. Summary of the Invention

[0003] The purpose of this invention is to provide a small-batch production line for cantilever side punching of stretched tubes that solves or partially solves the above-mentioned technical problems.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A small-batch production line for cantilevered side punching of drawn tubes, used for stamping cylindrical workpieces with side holes, comprising: Vertical stamping section: used to receive the round material fed by the vibratory feeder and to stretch and stamp the round material to process it into a cylindrical semi-finished product. Side punching section: Insert the cantilever bracket into the semi-finished product and punch side holes in the semi-finished product; It also includes a horizontally arranged transfer frame, which includes a left frame and a right frame that periodically open and close and reciprocate back and forth, for transferring workpieces between different workstations; the transfer frame is provided with at least one flipping fixture for flipping the semi-finished product 90° with the opening facing backward; Each of the cantilever brackets includes a cylindrical guide tube, and a columnar guide post is provided inside each guide tube. An L-shaped cantilever is pivotally connected to the guide post. The cantilever extends into the outside of the guide tube through an S-shaped guide groove on the guide tube. At least one cylinder drives the guide post to move back and forth inside the guide tube. The structure of the guide groove is such that the cantilever is vertically upward when it is at the rear and horizontally sideways when it is at the front. A side punching die is provided on the cantilever.

[0005] Preferably, the flipping fixture includes cylindrical clamping blocks rotatably mounted on the left and right frames, each clamping block having an arc-shaped groove on its inner side for clamping the workpiece, and at least one motor for driving the clamping blocks to rotate and a limiting block for limiting the rotation angle of the clamping blocks are mounted on the left and right frames.

[0006] Preferably, the cantilever bracket further includes a bracket body, on which a pivot shaft is provided. The pivot shaft is connected to an L-shaped rear limiting rod. A torsion spring is sleeved on the pivot shaft to drive the rear end of the rear limiting rod to rotate upward. The bottom front of the guide post is provided with two guide grooves that are deeper at the rear and shallower at the front, and a guide slope is provided between the two guide grooves. The front end of the rear limiting rod passes through a through hole provided at the bottom of the guide cylinder, extends into the guide cylinder, and abuts against the guide groove.

[0007] Preferably, a guide portion is provided at the free end of the rear end of the rear limiting rod.

[0008] Preferably, each of the side punch dies is provided with a spring clip to eject the waste material.

[0009] Preferably, the vertical stamping section includes: The feeding station is used to receive round materials fed in by the vibratory feeder; The pre-stretching station is used to stamp round materials into cylindrical semi-finished products until their height is 1 / 3 of the designed height; The stretching station is used to further stretch the cylindrical semi-finished product to a height of 5 / 6 of the design height. The shaping station is used to shape cylindrical semi-finished products so that their external structure meets the design requirements.

[0010] Preferably, the side stamping section includes a side stamping station, and the side stamping station includes a punch corresponding to the side stamping die.

[0011] Preferably, a waste collection plate is inclinedly installed below each of the cantilever supports.

[0012] The beneficial effects of this invention are: the workpiece is flipped 90° by a flipping fixture, and then the workpiece is provided with internal support by a cantilever bracket to prevent the workpiece from collapsing during the stamping process; during the forward and backward movement of the guide post, the drive rear limit rod limits the workpiece from the rear to avoid workpiece displacement; this invention has a simple structure, is easy to implement, has low cost, and is suitable for small-batch side-punching production lines. Attached Figure Description

[0013] Figure 1 This is a side view of the structure of the first embodiment; Figure 2 This is a top view of the transfer frame and cantilever support structure. Figure 3This is a three-dimensional structural diagram of a cantilever bracket; Figure 4 This is a cross-sectional structural diagram of a cantilever bracket. Detailed Implementation

[0014] The technical solution of the present invention will be further described in detail below with reference to specific embodiments.

[0015] In the description of this invention, it should be noted that the terms "inner", "outer", "upper", "lower", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0016] like Figures 1 to 4 As shown, the present invention provides a small-batch production line for cantilevered side punching of stretched tubes for stamping cylindrical workpieces with side holes. The side holes are punched by setting the workpiece laterally, eliminating the need for designing a complex side punch.

[0017] include: Upper mold 1 and lower mold 2 are arranged sequentially along the processing direction as follows: Vertical stamping section: used to receive the round material fed by the vibratory feeder (not shown) and to stretch and stamp the round material to process it into a cylindrical semi-finished product. Side punching section: Insert the cantilever bracket into the semi-finished product and punch side holes in the semi-finished product; It also includes a transfer frame 10 horizontally arranged between the upper mold 1 and the lower mold 2. The transfer frame 10 includes a left frame 12 and a right frame 14 that periodically open and close and reciprocate back and forth to transfer workpieces between different workstations. It is a conventional structure in the industry, so its power and transmission method are not described in detail. A flipping fixture is provided on the transfer frame 10 to flip the semi-finished product 90° with the opening facing backward. The flipping fixture includes cylindrical clamping blocks 16 that are rotatably arranged on the left frame 12 and the right frame 14. The inner side of each clamping block 16 is provided with an arc-shaped groove 18 for clamping the workpiece. At least one motor 20 for driving the clamping block 16 to rotate and a limiting block (not shown) for limiting the rotation angle of the clamping block 16 are provided on the left frame 12 and the right frame 14. Each cantilever bracket includes a cylindrical guide tube 22, and a columnar guide post 24 is provided inside each guide tube 22. An L-shaped cantilever 26 is pivotally connected to the guide post 24. The cantilever 26 extends into the guide tube 22 through an S-shaped guide groove 28 on the guide tube 22. At least one cylinder drives the guide post 24 to move back and forth inside the guide tube 22. The structure of the guide groove 28 allows the cantilever 26 to be set vertically upward when it is at the rear and horizontally sideways when it is at the front. A side punching die 30 is provided on the cantilever 26.

[0018] The cantilever support also includes a support body 32, on which a pivot shaft 34 is mounted. The pivot shaft 34 is connected to an L-shaped rear limiting rod 36. A torsion spring (not shown) is fitted onto the pivot shaft 34 to drive the rear end of the rear limiting rod 36 to rotate upwards. Two guide grooves 38, deeper at the rear and shallower at the front, are provided at the bottom of the guide post 24, with a guide ramp 40 between the two guide grooves 38. The front end of the rear limiting rod 36 passes through a through hole (not shown) at the bottom of the guide cylinder 22, extends into the guide cylinder 22, and abuts against the guide groove 38. A guide portion 42 is provided at the free end of the rear end of the rear limiting rod 36.

[0019] The vertical stamping section includes: Feeding station 44 is used to receive round materials fed in by the vibratory feeder; Pre-stretching station 46 is used to stamp round material into cylindrical semi-finished product until its height is 1 / 3 of the design height; The stretching station 48 is used to further stretch the cylindrical semi-finished product until its height is 5 / 6 of the design height. Shaping station 50 is used to shape cylindrical semi-finished products so that their external structure meets the design requirements; The aforementioned workstations all include an upper die (unmarked) and a lower die (unmarked). The lower die contains a corresponding die (unmarked), and the upper die contains a punch (unmarked). These are all conventional structures in the field and therefore are not described in detail. The accompanying drawings also include several other auxiliary workstations, such as punching and flange cutting. Since they are not closely related to the innovation of this invention, they are not described in detail.

[0020] The side punching section includes a side punching station 52, which includes a punch (not labeled) corresponding to the side punching die 30.

[0021] Furthermore, each side punch die 30 is provided with a spring clip (not shown) to eject waste material, and a waste collection plate 56 is inclinedly provided below each cantilever bracket.

[0022] The workflow of this invention is as follows: S1. Receives round material fed in by the vibratory feeder; S2. The steel sheet is stamped and stretched to form a semi-finished cylindrical structure, stamped to 1 / 3 of the designed height; S3. Further stamp the semi-finished product in S2 to 5 / 6 to 9 / 10 of the design height, leaving a portion for the next station; S4. Further shape the semi-finished product in S3 to make its shape and structure meet the design requirements, and obtain a semi-finished product with the same height and shape as the design requirements. Step-by-step stamping and stretching from S2 to S4 can effectively avoid cracking and other issues. S5. Flip the semi-finished product in S4 by 90°, with the opening facing forward (the front and back are determined by the processing direction of the semi-finished product); Cylinder 58 drives the guide post 24 to move backward inside the guide cylinder 22, and the cantilever 26 rotates along the guide groove 28 on the guide post 24 and moves backward, rotating to a vertically upward structure, and inserts backward into the semi-finished product to form an internal support for the semi-finished product; At the same time, the rear limit rod 36 rotates, forming a limit on the semi-finished product from back to front, preventing it from detaching from the cantilever 26; The punch of the side punching station presses down to perform side punching; S6. Open the mold. The cylinder 58 drives the guide post 24 to move forward in the guide cylinder 22. The cantilever 26 rotates along the guide groove 28 on the guide post 24 and moves forward to exit the semi-finished product. The cantilever 26 rotates to the horizontal and pours out the waste material in the side punch die 30. S7. Complete the processing.

[0023] In step S5, the motor 20 drives the clamping block 16 to rotate, causing the workpiece to rotate. Due to the action of the limiting block, it rotates exactly 90°. When the cylinder 58 drives the guide post 24 to move backward in the guide cylinder 22, the front end of the rear limiting rod 36 is subjected to elastic force and abuts against the guide groove 38. At this time, the rear limiting rod 36 has not rotated and is below the workpiece. The guide post 24 continues to move until the front end of the rear limiting rod 36 climbs along the guide slope 40. The rear limiting rod 36 rotates and abuts against the workpiece from back to front, thereby limiting the workpiece. After the transfer frame 10 is released, the motor 20 reverses and resets.

[0024] In step S6, the spring sheet inside the side punch die 30 helps the scrap material to pop out and fall smoothly into the scrap collection plate 56 below.

[0025] Throughout the entire processing, the transfer frame 10 maintains a cyclical motion of clamping → advancing → opening → retracting, transferring the workpiece sequentially to the next workstation.

[0026] The structural design of this invention involves avoidance and drive structures, which are basic skills that ordinary technicians should master, and therefore are not described in detail.

[0027] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made based on the content of the present invention specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A small-batch production line for cantilevered side punching of drawn tubes, used for stamping cylindrical workpieces with side holes, characterized in that, include: Vertical stamping section: used to receive the round material fed by the vibratory feeder and to stretch and stamp the round material to process it into a cylindrical semi-finished product. Side punching section: Insert the cantilever bracket into the semi-finished product and punch side holes in the semi-finished product; It also includes a horizontally arranged transfer frame, which includes a left frame and a right frame that periodically open and close and reciprocate back and forth, for transferring workpieces between different workstations; the transfer frame is provided with at least one flipping fixture for flipping the semi-finished product 90° with the opening facing backward; Each of the cantilever brackets includes a cylindrical guide tube, and a columnar guide post is provided inside each guide tube. An L-shaped cantilever is pivotally connected to the guide post. The cantilever extends into the outside of the guide tube through an S-shaped guide groove on the guide tube. At least one cylinder drives the guide post to move back and forth inside the guide tube. The structure of the guide groove is such that the cantilever is vertically upward when it is at the rear and horizontally sideways when it is at the front. A side punching die is provided on the cantilever.

2. The small-batch production line for cantilever side punching of stretched tubes according to claim 1, characterized in that, The flipping fixture includes cylindrical clamping blocks rotatably mounted on the left and right frames. The inner side of each clamping block is provided with an arc-shaped groove for clamping the workpiece. At least one motor for driving the clamping block to rotate and a limiting block for limiting the rotation angle of the clamping block are provided on the left and right frames.

3. The small-batch production line for cantilever side punching of stretched tubes according to claim 1, characterized in that, The cantilever bracket also includes a bracket body, on which a pivot shaft is provided. The pivot shaft is connected to an L-shaped rear limiting rod. A torsion spring is sleeved on the pivot shaft to drive the rear end of the rear limiting rod to rotate upward. The bottom front of the guide post is provided with two guide grooves that are deeper at the rear and shallower at the front, and a guide slope is provided between the two guide grooves. The front end of the rear limiting rod passes through a through hole at the bottom of the guide cylinder, extends into the guide cylinder, and abuts against the guide groove.

4. A small-batch production line for cantilever side punching of stretched tubes according to claim 3, characterized in that, A guide portion is provided at the free end of the rear limit rod.

5. A small-batch production line for cantilever side punching of stretched tubes according to claim 1, characterized in that, Each of the side punch dies is provided with a spring clip to eject the waste material.

6. A small-batch production line for cantilever side punching of stretched tubes according to claim 1, characterized in that, The vertical stamping section includes: The feeding station is used to receive round materials fed in by the vibratory feeder; The pre-stretching station is used to stamp round materials into cylindrical semi-finished products until their height is 1 / 3 of the designed height; The stretching station is used to further stretch the cylindrical semi-finished product to a height of 5 / 6 of the design height. The shaping station is used to shape cylindrical semi-finished products so that their external structure meets the design requirements.

7. A small-batch production line for cantilever side punching of stretched tubes according to claim 1, characterized in that, The side stamping section includes a side stamping station, and the side stamping station includes a punch corresponding to the side stamping die.

8. A small-batch production line for cantilever side punching of stretched tubes according to claim 1, characterized in that, Each cantilever support has a waste collection plate installed at an angle below it.

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