Aluminum ladder automatic punching die

Abstract

The present invention relates to the field of punching dies, and specifically to an automatic punching die for aluminum ladder steps, which comprises a first core rod and a second core rod that can be connected and separated, wherein the first core rod can be slidably connected to a die frame, and comprises a first support portion for supporting the inner wall of a circular tube of the ladder step, a first connection portion arranged at the end, and an operating portion that can be extended and retracted along an axis. The second core rod is detachably connected to the first core rod, and comprises a movable portion, a second support portion and a second connection portion that are evenly distributed around the movable portion, and the second support portion can move radially to achieve radial expansion. The first connection portion and the second connection portion are connected by magnetic adsorption or vacuum adsorption, and the operating portion can extend out of the connected movable portion and drive it to move axially. In the embodiment of the present invention, the first core rod and the second core rod respectively support the inner walls of the circular tube on both sides of the movable die hole, thereby preventing the inward compression deformation of the circular tube caused by the punching force and ensuring the shape accuracy of the ladder step.

Description

Technical Field

[0001] The invention relates to the field of punching and cutting dies, and in particular to an automatic punching and cutting die for aluminum ladder steps. Background Art

[0002] Ladder rungs are long strips of aluminum alloy parts used in ladder manufacturing. They are usually formed by extrusion process and are 6 to 12 meters long when leaving the factory. In order to accommodate ladders of different specifications, the ladder rungs need to be cut into sections of about 0.5 meters in length for assembly.

[0003] At present, ladder rungs are mainly cut by sawing. However, the sawing process has significant defects such as high dust, high noise and many burrs.

[0004] In order to solve the above problems, the industry is considering using punching technology to replace the sawing technology. The punching technology has the advantages of high processing efficiency, neat incision, reduced dust and noise, etc. However, the structure of the ladder is relatively complex and is easily deformed during punching. Summary of the invention

[0005] The purpose of the invention is to provide an automatic punching die for aluminum ladder steps, so as to solve the problem that the ladder steps are easily deformed when being cut by the die.

[0006] In order to solve the above technical problems, the present invention specifically provides the following technical solutions:

[0007] An automatic punching die for aluminum ladder steps, comprising a die frame, a fixed die, a movable die, a first core rod and a second core rod; the fixed die is fixedly connected to the die frame, the fixed die is provided with a positioning hole penetrating through the fixed die and a movable die hole perpendicularly intersecting the positioning hole, the positioning hole matches the cross section of the ladder step for allowing the ladder step to pass through, and the movable die hole is used for allowing the movable die to pass through to cut off the ladder step; the movable die can be slidably connected to the die frame, and is driven by a driver to move along the movable die hole, thereby cutting off the ladder step in the positioning hole; the first core rod can be slidably connected to the die frame, the first core rod comprises a first supporting portion, a first connecting portion and an operating portion, the first supporting portion is used to support the inner wall of the circular tube of the ladder step, the first connecting portion is arranged at the end of the first supporting portion, and the operating portion The part can be extended and retracted along the axis of the first core rod; the second core rod can be detachably connected to the first core rod, the second core rod includes a movable part, a second supporting part and a second connecting part, the movable part is coaxially connected to the second connecting part, the second supporting part is evenly distributed around the movable part, and is slidably connected to the second connecting part, the second supporting part can move radially relative to the second connecting part, the movable part is slidably connected to the second supporting part, the movable part can move axially relative to the second supporting part, so that the second supporting part expands radially; wherein, the first connecting part and the second connecting part are arranged opposite to each other and are connected by magnetic adsorption or vacuum adsorption, and the operating part can extend from the inside of the first supporting part to connect the movable part and drive it to move axially.

[0008] Furthermore, the operating portion includes an operating handle and an operating end, the operating handle can move and rotate along the axial direction of the first core rod, and the operating end extends along the radial direction of the operating handle for connecting to and driving the movable portion.

[0009] Furthermore, the movable part is provided with a second blind hole extending axially and a cavity located at the end of the second blind hole; when the operating handle is rotated to a specific angle, the operating end can pass through the second blind hole and be inserted into the cavity to be connected to the movable part; when the operating handle is rotated to a non-specific angle, the operating end cannot pass through the second blind hole, thereby realizing the connection and separation of the operating part and the movable part.

[0010] Furthermore, the first support portion includes a main body and a first insert, both of which are cylindrical, the first insert is connected to the main body by bolts, the main body is used to connect to the driver to provide axial movement, and the first insert is used to support the inner wall of the circular tube of the ladder step.

[0011] Furthermore, the first connecting portion is embedded in a first blind hole at the end of the main body, the first insert seals the first connecting portion in the first blind hole, and the main body, the first insert and the first connecting portion are all provided with a through hole for the operating portion to pass axially.

[0012] Furthermore, the cross-section of the second support portion is a fan ring shape, the peripheral wall of the movable portion is provided with a slide rail extending along the busbar direction, the inner wall of the second support portion is provided with a slide groove corresponding to the slide rail, the slide rail cooperates with the slide groove, and the second support portion realizes radial movement when sliding along the busbar direction of the movable portion.

[0013] Furthermore, the second supporting portion includes a sliding portion and a second insert, the second insert is connected to the sliding portion by bolts, the second insert is arranged toward the first insert, the slide groove is arranged on the sliding portion, the sliding portion is used to cooperate with the movable portion to perform radial movement, and the second insert is used to support the inner wall of the circular tube of the ladder step.

[0014] Furthermore, a step is provided on a side of the second insert facing the sliding portion, an annular groove is formed inside the step and is distributed around the axis of the movable portion, the second connecting portion is installed in the annular groove, and the second connecting portion is provided with a through hole for the operating portion to pass axially.

[0015] Furthermore, the diameter of one end of the second supporting portion for inserting into the circular tube gradually shrinks.

[0016] Furthermore, the adsorption connection method of the first connection part and the second connection part is magnetic adsorption, the first connection part is a permanent magnet or an electromagnet, and the second connection part is a ferromagnetic material.

[0017] Compared with the prior art, this application has the following beneficial effects:

[0018] An automatic punching die for aluminum steps is provided, in which a second core rod capable of being connected to and separated from a first core rod and having a radially expandable structure is designed, so that the first core rod and the second core rod respectively support the inner walls of a round tube on both sides of a movable die hole, thereby preventing the round tube from being compressed and deformed inwardly due to the punching force and ensuring the shape accuracy of the steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. Obviously, the drawings in the following description are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

[0020] Figure 1 It is the axial view of the ladder rung;

[0021] Figure 2 A three-dimensional diagram of an embodiment of the present invention;

[0022] Figure 3 A top view of an embodiment of the present invention;

[0023] Figure 4 for Figure 3 Cross-sectional view in the AA direction;

[0024] Figure 5 for Figure 4 A schematic diagram of another working condition;

[0025] Figure 6 A three-dimensional diagram of a first mandrel and a second mandrel in a separated state according to an embodiment of the present invention;

[0026] Figure 7 is an assembly diagram of a first mandrel according to an embodiment of the present invention;

[0027] Figure 8 is an assembly diagram of a second mandrel according to an embodiment of the present invention;

[0028] The numbers in the figure represent the following:

[0029] 1-ladder; 11-round tube; 12-vertical plate; 13-horizontal plate; 2-fixed mold; 3-movable mold; 4-first core rod; 41-first support part; 411-main body; 412-first blind hole; 413-first insert; 42-first connecting part; 43-operating part; 431-operating handle; 432-operating end; 5-second core rod; 51-second supporting part; 511-sliding part; 512-sliding groove; 513-second insert; 514-step; 52-second connecting part; 53-movable part; 531-slide rail; 532-second blind hole; 533-cavity. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] The ladder rung 1 is a long strip of aluminum alloy parts used in ladder manufacturing, formed by an extrusion process, with a length of about 6 meters when leaving the factory, and needs to be cut into sections of about 0.5 meters for assembly.

[0032] At present, the ladder rungs 1 are mainly cut by sawing, but this process has problems such as high dust, high noise, and many burrs. To solve these problems, the punching process is considered, however, the complex structure of the ladder rungs 1 increases the difficulty of punching.

[0033] Figure 1 A cross section of a step 1 is shown. The step 1 comprises a circular tube 11, a vertical plate 12 and a horizontal plate 13 and other components. The structure is relatively complex. The circular tube 11 is the main load-bearing component of the step 1. The vertical plate 12 is connected to the outer wall of the circular tube 11 in parallel and is located on the radial plane of the circular tube 11. The horizontal plate 13 is perpendicular to the vertical plate 12 and is connected to the side of the vertical plate 12 away from the circular tube 11.

[0034] Using a punching process to cut off the ladder step 1 can easily cause the round tube 11 to be compressed and deformed inward. The purpose of this embodiment is to provide an automatic punching die for the aluminum ladder step 1, which can effectively support the inner wall of the round tube 11 during the punching process to prevent the ladder step 1 from being deformed when being punched.

[0035] Figure 2 , Figure 3 The structure of the automatic punching die for the aluminum ladder step 1 is presented. The automatic punching die for the aluminum ladder step 1 includes: a die frame, a fixed die 2, a movable die 3, a first core rod 4 and a second core rod 5.

[0036] The mold frame is used to support and fix the various mold components to ensure processing accuracy. The mold frame is not shown in the figure.

[0037] The fixed mold 2 is fixedly connected to the mold frame. The fixed mold 2 has a positioning hole and a movable mold hole that penetrate through itself. The positioning hole matches the cross-section of the ladder step 1. The positioning hole allows one end of the ladder step 1 to pass through the interior of the fixed mold 2. The movable mold hole is perpendicular to and intersects with the positioning hole. The movable mold hole allows one end of the movable mold 3 to pass through the interior of the fixed mold 2.

[0038] The movable mold 3 is slidably connected to the mold frame. The movable mold 3 is driven by a driver to pass through the movable mold hole to cut off the ladder step 1 inside the positioning hole.

[0039] Figure 6 The separated state of the first mandrel 4 and the second mandrel 5 is shown. The first mandrel 4 and the second mandrel 5 are detachably connected. The first mandrel 4 is slidably connected to the mold frame, the second mandrel 5 can be radially extended, and the first mandrel 4 is driven by another driver.

[0040] Figure 4 , Figure 5 Different working conditions of the automatic punching die for aluminum ladder step 1 are shown. The punching steps include:

[0041] Step 1: After the first core rod 4 and the second core rod 5 are connected, they are inserted into the inside of the round tube 11 from the opposite direction of the direction in which the ladder step 1 passes through the positioning hole.

[0042] Step 2: The second core rod 5 expands radially outward, and the second core rod 5 supports the inner wall of the circular tube 11 on one side of the movable die hole.

[0043] Step 3: The first core rod 4 is separated from the second core rod 5, and the first core rod 4 supports the inner wall of the round tube 11 on the other side of the movable die hole.

[0044] Step 4: The movable die 3 passes through the movable die hole and cuts off the ladder 1. Since the inner walls of the round tube 11 on both sides of the movable die hole are supported by the first core rod 4 and the second core rod 5 respectively, the inward deformation of the round tube 11 is effectively prevented.

[0045] Step 5: After the punching is completed, the movable mold 3, the first core rod 4 and the second core rod 5 are reset to prepare for the next operation.

[0046] The automatic punching die for the aluminum ladder step 1 effectively solves the problem of inward deformation of the round tube 11 during the punching process, improves processing quality and production efficiency, and has broad application prospects.

[0047] Figure 6 , Figure 7 and Figure 8 The specific structures of the first core rod 4 and the second core rod 5 are shown.

[0048] Composition and function of the first core rod 4: The first core rod 4 includes a first supporting portion 41, a first connecting portion 42 and an operating portion 43, wherein the first supporting portion 41 is used to support the inner wall of the circular tube 11 of the ladder step 1, the first connecting portion 42 is used to coaxially connect the second core rod 5, and the operating portion 43 can be extended and retracted along the axis of the first core rod 4.

[0049] Composition and function of the second mandrel 5: The second mandrel 5 includes a second support portion 51, a second connection portion 52 and a movable portion 53, wherein the movable portion 53 and the second connection portion 52 are coaxially connected, the second support portion 51 is evenly distributed around the movable portion 53, and the second support portion 51 and the second connection portion 52 are slidably connected, the second support portion 51 can move radially relative to the second connection portion 52, the movable portion 53 and the second support portion 51 are slidably connected, and the movable portion 53 can move axially relative to the second support portion 51, thereby forming a radially expandable structure. When the second connection portion 52 remains stationary and the movable portion 53 moves axially relative to the second connection portion 52, the second support portion 51 moves radially relative to the second connection portion 52.

[0050] The connection method between the first core rod 4 and the second core rod 5: the first connecting part 42 and the second connecting part 52 are arranged opposite to each other and connected by magnetic adsorption or vacuum adsorption. The operating part 43 can extend from the inside of the first support part 41, and then connect to the movable part 53 and drive the movable part 53 to move axially. The operating part 43 can also be separated from the movable part 53 and then retracted into the inside of the first support part 41.

[0051] In step 1, the step of connecting the first core rod 4 and the second core rod 5 specifically includes: the first connecting portion 42 and the second connecting portion 52 are connected, and the operating portion 43 extends from the inside of the first supporting portion 41, and then the movable portion 53 is connected to prepare for subsequent operations.

[0052] In step 2, the step of radially expanding the second mandrel 5 outward specifically includes: the operating part 43 is pushed along the axial direction of the first mandrel 4 to drive the movable part 53 to move axially relative to the second supporting part 51. The axial movement of the movable part 53 causes the second supporting part 51 to expand radially outward relative to the second connecting part 52 to support the inner wall of the circular tube 11.

[0053] In step 3, the step of separating the first mandrel 4 from the second mandrel 5 specifically includes: the operating part 43 keeps its position unchanged, the first mandrel 4 retreats under the action of the driver, and the connection between the first connecting part 42 and the second connecting part 52 is released. At this time, the second supporting part 51 remains stationary due to the friction force and continues to support the inner wall of the round tube 11. The movable part 53 also keeps its position unchanged under the support of the operating part 43. Finally, the operating part 43 retracts into the inside of the first supporting part 41 to prepare for the next operation.

[0054] Composition and function of the first support portion 41: Combination Figure 7 The first support portion 41 includes a main body 411 and a first insert 413, both of which are cylindrical in shape. The first insert 413 is connected to the main body 411 by bolts, wherein the main body 411 is used to connect to the driver to provide an axial movement function, and the first insert 413 is used to support the inner wall of the circular tube 11.

[0055] The structure and function of the first connecting part 42: The first connecting part 42 is a permanent magnet or an electromagnet. The end of the main body 411 is provided with a first blind hole 412 for embedding the first connecting part 42. The first insert 413 serves as an end cover that closes the first connecting part 42 to the inside of the first blind hole 412. The main body 411, the first insert 413 and the first connecting part 42 are all provided with a through hole for the operating part 43 to pass axially.

[0056] Combination Figure 8 The movable portion 53 is in a prism shape or a truncated cone shape, the second support portion 51 is in a fan ring shape, and the diameter of one end of the second support portion 51 gradually shrinks to facilitate insertion into the interior of the circular tube 11.

[0057] The peripheral wall of the movable part 53 is provided with a slide rail 531 extending along the generatrix, and the inner wall of the second support part 51 is provided with a corresponding slide groove 512. The slide rail 531 cooperates with the slide groove 512 to enable the second support part 51 to slide along the generatrix direction of the movable part 53 to achieve radial movement.

[0058] The second supporting portion 51 includes a sliding portion 511 and a second insert 513, wherein the second insert 513 is connected to the sliding portion 511 by bolts, and the second insert 513 is arranged toward the first insert 413, wherein the slide groove 512 is arranged on the sliding portion 511, the sliding portion 511 is used to cooperate with the movable portion 53 to perform radial movement, and the second insert 513 is used to support the inner wall of the circular tube 11.

[0059] A step 514 is provided on one side of the second insert 513 facing the sliding portion 511, and an annular groove is formed inside the step 514 and is distributed around the axis of the movable portion 53. The second connecting portion 52 is installed inside the annular groove. The second connecting portion 52 is made of ferromagnetic material and is provided with a through hole for the operating portion 43 to pass axially.

[0060] Combination Figure 4 , Figure 5 , Figure 6 , Figure 7 and Figure 8 The operating part 43 includes an operating handle 431 and an operating end 432. The operating handle 431 is a rod-shaped member that can move axially along the first core rod 4. The operating end 432 is a strip-shaped member extending in the radial direction of the operating handle 431. The operating handle 431 is connected to an independent driver that can drive the operating handle 431 to perform axial movement and rotational movement.

[0061] The movable portion 53 includes a second blind hole 532 extending axially inwardly, and a cavity 533 formed at the end of the second blind hole 532. The operating end 432 can rotate inside the cavity 533. The operating end 432 can and can only pass through the second blind hole 532 when the operating handle 431 is rotated to an angle.

[0062] When the operating handle is rotated to a specific angle, the operating end 432 is aligned with the second blind hole 532 and can be pulled out of the movable portion 53 to be separated from the movable portion 53 .

[0063] When the operating end 432 is inserted into the cavity 533 and the operating handle is rotated to a non-specific angle, the operating end 432 cannot pass through the second blind hole 532 , and the operating portion 43 can drive the movable portion 53 to move axially.

[0064] The above embodiments are only exemplary embodiments of the present invention and are not intended to limit the present invention. The protection scope of the present invention is defined by the claims. Those skilled in the art may make various modifications or equivalent substitutions to the present invention within the essence and protection scope of the present invention, and such modifications or equivalent substitutions shall also be deemed to fall within the protection scope of the present invention.

Claims

1. An automatic punching die for aluminum ladder steps, characterized in that: It includes a mold frame, a fixed mold, a movable mold, a first core rod and a second core rod; The fixed die is fixedly connected to the die frame, and the fixed die is provided with a positioning hole penetrating through the fixed die and a movable die hole perpendicularly intersecting the positioning hole, the positioning hole matches the cross section of the ladder step and is used for the ladder step to pass through, and the movable die hole is used for the movable die to pass through to cut off the ladder step; The movable mold can be slidably connected to the mold frame and driven by a driver to move along the movable mold hole, thereby cutting off the ladder steps in the positioning hole; The first mandrel is slidably connected to the mold frame, and the first mandrel comprises a first supporting portion, a first connecting portion and an operating portion, wherein the first supporting portion is used to support the inner wall of the circular tube of the ladder step, the first connecting portion is arranged at the end of the first supporting portion, and the operating portion can be extended and retracted along the axis of the first mandrel; The second mandrel can be detachably connected to the first mandrel, the second mandrel comprises a movable portion, a second supporting portion and a second connecting portion, the movable portion is coaxially connected to the second connecting portion, the second supporting portion is evenly distributed around the movable portion and is slidably connected to the second connecting portion, the second supporting portion can move radially relative to the second connecting portion, the movable portion is slidably connected to the second supporting portion, the movable portion can move axially relative to the second supporting portion, so as to radially expand the second supporting portion; The first connection part and the second connection part are arranged opposite to each other and connected by magnetic adsorption or vacuum adsorption, and the operating part can extend from the inside of the first supporting part to connect with the movable part and drive the movable part to move axially.

2. The automatic punching die for aluminum ladder steps according to claim 1, characterized in that: The operating portion includes an operating handle and an operating end. The operating handle can move and rotate along the axial direction of the first core rod. The operating end extends along the radial direction of the operating handle and is used to connect and drive the movable portion.

3. The automatic punching die for aluminum ladder steps according to claim 2, characterized in that: The movable portion is provided with a second blind hole extending axially and a cavity located at the end of the second blind hole; When the operating handle is rotated to a specific angle, the operating end can pass through the second blind hole and be inserted into the cavity to be connected with the movable part; When the operating handle is rotated to a non-specific angle, the operating end cannot pass through the second blind hole, thereby achieving connection and separation between the operating part and the movable part.

4. An automatic punching die for aluminum ladder steps according to any one of claims 1 to 3, characterized in that: The first support portion includes a body and a first insert, both of which are cylindrical. The first insert is connected to the body by bolts. The body is used to connect a driver to provide axial movement. The first insert is used to support the inner wall of the circular tube of the ladder step.

5. The automatic punching die for aluminum ladder steps according to claim 4, characterized in that: The first connection part is embedded in a first blind hole at the end of the body, the first insert seals the first connection part in the first blind hole, and the body, the first insert and the first connection part are all provided with a through hole for the operating part to pass axially.

6. The automatic punching die for aluminum ladder steps according to claim 4, characterized in that: The cross-section of the second support portion is a fan ring shape, the peripheral wall of the movable portion is provided with a slide rail extending along the busbar direction, the inner wall of the second support portion is provided with a slide groove corresponding to the slide rail, the slide rail cooperates with the slide groove, and when the movable portion slides along the busbar direction, the second support portion realizes radial movement.

7. The automatic punching die for aluminum ladder steps according to claim 6, characterized in that: The second supporting portion includes a sliding portion and a second insert, the second insert is connected to the sliding portion by bolts, the second insert is arranged toward the first insert, the slide groove is arranged on the sliding portion, the sliding portion is used to cooperate with the movable portion to perform radial movement, and the second insert is used to support the inner wall of the circular tube of the ladder step.

8. The automatic punching die for aluminum ladder steps according to claim 7, characterized in that: The second insert has a step on one side facing the sliding part, an annular groove is formed inside the step and is distributed around the axis of the movable part. The second connecting part is installed in the annular groove, and the second connecting part has a through hole for the operating part to pass axially.

9. The automatic punching die for aluminum ladder steps according to claim 6, characterized in that: The diameter of one end of the second supporting portion for inserting into the round tube gradually shrinks.

10. The automatic punching die for aluminum ladder steps according to claim 1, characterized in that: The adsorption connection method of the first connection part and the second connection part is magnetic adsorption, the first connection part is a permanent magnet or an electromagnet, and the second connection part is a ferromagnetic material.

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