Carbon fiber arm stamping tool

Abstract

The utility model relates to a carbon fiber arm stamping tool, which belongs to the field of carbon fiber material stamping dies and comprises an upper die, a lower die, a side die, a lower die moving platform, an inner die, a sliding connecting rod and a spring. The upper mold and the lower mold can be relatively close to or far away from each other; a forming cavity is formed in the lower mold, and a plurality of sliding holes are formed in the bottom of the lower mold in the vertical direction; the sliding connecting rods and the sliding holes are equal in number and are in one-to-one corresponding sliding connection; the lower die movable platform is connected with a plurality of sliding connecting rods, and each sliding connecting rod is sleeved with a spring. The at least two side molds are rotationally connected with the side surfaces of the lower mold movable platform respectively; and the inner mold is made of a flexible material and at least covers the lower mold movable platform and the top surfaces of all the side molds. Through the accompanying structure and the flexible inner die, wrinkles generated under the condition of insufficient constraint of the carbon fiber material and damage defects caused by extrusion of too strong external force are avoided.

Description

Technical Field

[0001] The utility model belongs to the field of stamping dies for carbon fiber materials, and particularly relates to a stamping tooling for carbon fiber arms. Background Art

[0002] There are a large number of arm structural members in the body structure of a robot, which bear the main motion load of the robot. With the continuous improvement of the requirements for the efficiency of robot products, the lightweight requirement for its moving components is also continuously increasing.

[0003] The stamping process is a high-efficiency forming process and is widely used in fields such as metal shells. However, since the elongation at break of carbon fiber is only about 1.5%, it does not have the ductility of metal materials. When using existing stamping tooling for stamping, defects such as product wrinkles and fiber damage will occur at the bending places. In the prior art, to avoid this problem, a combined arm of a carbon fiber structural member and a metal casting member is often used. However, its overall weight is relatively large, and there is still room for lightweight improvement. Another processing method is manual layup, but the overall efficiency is not high. Therefore, a tooling that can be used for stamping carbon fiber arms is needed. Summary of the Utility Model

[0004] In order to solve the above problems existing in the prior art, the utility model provides a stamping tooling for carbon fiber arms. The technical problems to be solved by the utility model are realized through the following technical solutions:

[0005] The utility model provides a stamping tooling for carbon fiber arms, including: an upper die, a lower die, side dies, a lower die moving platform, an inner die, sliding connecting rods, and springs; the upper die and the lower die can move relatively closer or farther away from each other; a forming cavity is arranged inside the lower die, and a plurality of sliding holes are arranged vertically at the bottom of the lower die, and all the sliding holes are communicated with the forming cavity; the number of sliding connecting rods is equal to the number of sliding holes, and they are slidably connected in one-to-one correspondence; the lower die moving platform is arranged inside the forming cavity and is respectively connected to a plurality of sliding connecting rods, and a spring is sleeved outside each sliding connecting rod, and two ends of each spring respectively abut between the lower die moving platform and the bottom surface of the forming cavity; there are at least two side dies, all the side dies are symmetrically arranged, and are respectively rotatably connected to the side surface of the lower die moving platform, and when the lower die moving platform moves downward in the vertical direction, all the side dies turn upward; the inner die is placed on the lower die moving platform and at least covers the top surfaces of the lower die moving platform and all the side dies, and the inner die is made of a flexible material.

[0006] In an embodiment of the utility model, all the side dies are rotatably connected to the lower die moving platform through hinges.

[0007] In an embodiment of the utility model, each side die is connected to the lower die moving platform through at least two hinges; the hinges are respectively connected to the bottom surfaces of the side die and the lower die moving platform.

[0008] In an embodiment of the present utility model, there are at least three sliding holes, two of which are located on the same side of the lower mold, and all the remaining sliding holes are located on the other side of the lower mold.

[0009] In an embodiment of the present utility model, one end of each sliding connecting rod is provided with a thread, and is connected to the lower mold moving platform through the thread.

[0010] In an embodiment of the present utility model, the carbon fiber arm stamping tooling further includes: a cooling plate, which is embedded on both sides of the lower mold; the projection length of at least one side of the cooling plate in the vertical direction is greater than the maximum projection length of the carbon fiber arm to be processed in the vertical direction.

[0011] In an embodiment of the present utility model, when the side mold is turned upwards, the sum of the contact areas between the lower mold and all side molds is less than the sum of the projection areas of the two cooling plates in the horizontal direction.

[0012] In an embodiment of the present utility model, the expression of the maximum sliding distance l of the sliding connecting rod in the sliding hole is:

[0013] l≥w;

[0014] Wherein, l is the maximum sliding distance of the sliding connecting rod in the sliding hole; w is the maximum width of any one side mold.

[0015] In an embodiment of the present utility model, the expression of the length l1 of the sliding connecting rod is:

[0016] l1≥l + l2 + l3;

[0017] Wherein, l1 is the length of the sliding connecting rod; l2 is the length after the spring is compressed; l3 is the minimum stable length of the sliding connecting rod in the sliding hole, l3≥2d, and d is the diameter of the sliding connecting rod.

[0018] In an embodiment of the present utility model, the expression of the thickness h of the bottom of the lower mold is:

[0019] h≥l + l3;

[0020] Wherein, h is the thickness of the bottom of the lower mold.

[0021] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0022] The stamping tooling for the carbon fiber arm of the present utility model has a lower die moving platform slidably connected to the lower die through a sliding connecting rod and buffered by a spring. The lower die moving platform is also rotatably connected to the side die, forming a follow-up structure. An inner die made of a flexible material is laid on the lower die moving platform and the side die, which can be turned upwards with the side die during stamping processing, effectively ensuring the consistency between the laying structure of the carbon fiber material and the die structure during the stamping and bending process, and avoiding wrinkles generated by the carbon fiber material under insufficient restraint and damage defects caused by excessive external force extrusion.

[0023] The above description is only an overview of the technical solution of the present utility model. In order to understand the technical means of the present utility model more clearly, it can be implemented according to the content of the specification. In order to make the above and other purposes, features and advantages of the present utility model more obvious and understandable, the following preferred embodiments are specifically given and described in detail in conjunction with the accompanying drawings as follows. Brief Description of the Drawings

[0024] Figure 1 is a schematic structural diagram (expanded state) of a stamping tooling for a carbon fiber arm provided by an embodiment of the present utility model;

[0025] Figure 2 is a partial cross-sectional view (expanded state) of a stamping tooling for a carbon fiber arm provided by an embodiment of the present utility model;

[0026] Figure 3 is a schematic structural diagram (expanded state) of a side die and a lower die moving platform provided by an embodiment of the present utility model;

[0027] Figure 4 is a schematic structural diagram (closed state) of a stamping tooling for a carbon fiber arm provided by an embodiment of the present utility model;

[0028] Figure 5 is a partial cross-sectional view (closed state) of a stamping tooling for a carbon fiber arm provided by an embodiment of the present utility model;

[0029] Figure 6 is a cross-sectional view (expanded state) of a stamping tooling for a carbon fiber arm provided by an embodiment of the present utility model;

[0030] Figure 7 is a cross-sectional view (closed state) of a stamping tooling for a carbon fiber arm provided by an embodiment of the present utility model.

[0031] Reference Signs: 1 - upper die; 2 - lower die; 21 - sliding hole; 3 - side die; 4 - lower die moving platform; 5 - hinge; 6 - inner die; 7 - sliding connecting rod; 8 - spring; 9 - cooling plate; 100 - prepreg sheet; 200 - initial blank of carbon fiber arm. Detailed Description of the Embodiment

[0032] In order to further elaborate on the technical means and effects adopted by the present utility model to achieve the intended utility model purpose, the following provides a detailed description of a carbon fiber arm stamping tooling according to the present utility model in combination with the accompanying drawings and specific embodiments.

[0033] The foregoing and other technical contents, features and effects of the present utility model can be clearly presented in the following detailed description in conjunction with the accompanying drawings. Through the description of the specific embodiments, a more in-depth and specific understanding of the technical means and effects adopted by the present utility model to achieve the intended purpose can be obtained. However, the accompanying drawings are only for reference and explanation, and are not used to limit the technical solutions of the present utility model.

[0034] Embodiment 1

[0035] As Figure 1 、 Figure 2 and Figure 3 shown, this embodiment provides a carbon fiber arm stamping tooling, including: an upper die 1, a lower die 2, side dies 3, a lower die moving platform 4, an inner die 6, a sliding connecting rod 7 and a spring 8.

[0036] In this embodiment, as Figure 1 、 Figure 2 、 Figure 3 and Figure 6 shown, the upper die 1 and the lower die 2 can approach or separate from each other relatively; a forming cavity is provided in the lower die 2, and a plurality of sliding holes 21 are arranged vertically at the bottom of the lower die 2, and all the sliding holes 21 communicate with the forming cavity; the number of sliding connecting rods 7 is equal to the number of sliding holes 21, and they are slidably connected one by one; the lower die moving platform 4 is arranged in the forming cavity and is respectively connected to a plurality of sliding connecting rods 7, and a spring 8 is sleeved outside each sliding connecting rod 7, and the two ends of the spring 8 respectively abut between the lower die moving platform 4 and the bottom surface of the forming cavity; there are at least two side dies 3, and all the side dies 3 are symmetrically arranged and are respectively rotatably connected to the side surface of the lower die moving platform 4, and when the lower die moving platform 4 moves downward in the vertical direction, all the side dies 3 turn upward; the inner die 6 is placed on the lower die moving platform 4 and covers at least the top surfaces of the lower die moving platform 4 and all the side dies 3, and the inner die 6 is made of a flexible material.

[0037] The principle is as follows: The lower die 2 is fixedly connected to the lower platform of the punching machine, and the upper die 1 is fixedly connected to the upper platform of the punching machine, and the upper die 1 approaches or separates from the lower die 2 in the vertical direction under the drive of the upper platform of the punching machine. It can be understood that when the upper die 1 approaches the lower die 2, it is the stamping process, and at this time the carbon fiber arm stamping tooling is in a closed state; similarly, when the upper die 1 separates from the lower die 2, it is the reset process, and at this time the carbon fiber arm stamping tooling is in an unfolded state.

[0038] Exemplarily, the lower die 2 array is provided with a plurality of through lower connection holes and is fixedly connected to the lower platform of the punching machine through the lower connection holes. Similarly, a plurality of through upper connection holes are spaced on the upper die 1 and are fixedly connected to the upper platform of the punching machine through the upper connection holes.

[0039] First, taking the unfolded state as an example: under the elastic force of the spring 8, the lower die moving platform 4 floats above the forming cavity of the lower die 2. The side dies 3 on both sides and the top surface of the lower die moving platform 4 are in the same plane, and at least part of the vertical projection of the side dies 3 on both sides is outside the vertical projection range of the forming cavity.

[0040] Then, taking the closed state as an example: the inner die 6, the carbon fiber prepreg sheet 100 and the carbon fiber arm blank 200 are sequentially placed on the lower die moving platform 4. Among them, the lower die moving platform 4, the sliding connecting rod 7, the spring 8 and the side die 3 form a follow-up structure, that is, the lower die moving platform 4 moves with the stamping process, and the side die 3 flips with the movement of the lower die moving platform 4. Specifically, when the upper die 1 approaches the lower die 2 for stamping, the sliding connecting rod 7 slides in the sliding hole 21, and the spring 8 provides a buffer for the sliding movement so that the lower die moving platform 4 descends smoothly. At the same time, the side die 3 flips upward, combines with the inner die 6 made of flexible material, supports the carbon fiber prepreg sheet 100 from both sides and constrains it on the side surface of the carbon fiber arm blank 200, providing a constraint for the carbon fiber prepreg sheet 100 during the stamping process and avoiding material damage defects caused by insufficient constraint.

[0041] In addition, after the stamping process is completed, the upper die 1 moves away from the lower die 2, and the lower die moving platform 4 returns to the unfolded state under the elastic force of the spring 8, and the side die 3 also flips to the horizontal, realizing the reset.

[0042] It should be noted that the carbon fiber arm stamping tooling of this embodiment can be applied to a variety of carbon fiber arms with different shapes, and it can select a suitable carbon fiber arm blank 200 according to the shape of the carbon fiber arm to be processed. It can be understood that the shapes and sizes of the forming cavity, the carbon fiber arm blank 200, the lower die moving platform 4 and the upper die 1 match the carbon fiber arm to be processed. In addition, the carbon fiber arm stamping tooling of this embodiment is provided with rounded corners at the bending parts to avoid right-angle bending of the inner die 6 and the carbon fiber prepreg sheet 100 during the stamping process.

[0043] In an alternative embodiment, as Figure 3 shown, all the side dies 3 are rotatably connected to the lower die moving platform 4 through hinges 5.

[0044] Further, each side mold 3 is connected to the lower mold moving platform 4 by at least two hinges 5; several hinges 5 connected to each side mold 3 are respectively arranged at intervals, and each hinge 5 is respectively connected to the bottom surfaces of the side mold 3 and the lower mold moving platform 4, so as to ensure that in the closed state, the joint between the hinge 5 or the side mold 3 and the lower mold moving platform 4 does not interfere with the carbon fiber prepreg sheet 100, that is, a complete stamping cavity is formed in the forming cavity.

[0045] In an alternative embodiment, as Figures 2 to 7 shown, there are at least three sliding holes 21, two of which are located on the same side of the lower mold 2, and all the remaining sliding holes 21 are arranged on the other side of the lower mold 2 away from the two sliding holes 21. It can be understood that at least three points determine a plane, so there are at least three corresponding sliding connecting rods 7, and setting the connection lines between the sliding connecting rods 7 on the horizontal plane as a triangle ensures the smooth movement of the lower mold moving platform 4.

[0046] In an alternative embodiment, one end of each sliding connecting rod 7 is provided with a thread (not shown in the figure) and is connected to the lower mold moving platform 4 by the thread.

[0047] Carbon fiber usually does not have ductility, but when carbon fiber is mixed with a resin-based matrix material to form a carbon fiber prepreg sheet 100, it can have a certain viscosity and deformation ability at room temperature, and the viscosity will be greatly reduced after the temperature decreases. By using this property, shaping and demolding can be achieved by cooling.

[0048] In an alternative embodiment, as Figure 2 and Figure 5 shown, the carbon fiber arm stamping tooling further includes: a cooling plate 9, the cooling plate 9 is embedded on both sides of the lower mold 2, and the projection length of at least one side of the cooling plate 9 in the vertical direction is greater than the maximum projection length of the carbon fiber arm to be processed in the vertical direction.

[0049] In addition, to ensure the cooling and heat dissipation effect of the cooling plate 9, when the side mold 3 is turned upwards, the sum of the contact areas between the lower mold 2 and all side molds 3 is smaller than the sum of the projection areas of the cooling plates 9 on both sides in the horizontal direction.

[0050] Optionally, the cooling plate 9 can be prepared using semiconductor material.

[0051] In this embodiment, as Figure 3 and Figure 6 shown, the expression of the maximum sliding distance l of the sliding connecting rod 7 in the sliding hole 21 is:

[0052] l≥w (1);

[0053] Wherein, l is the maximum sliding distance of the sliding connecting rod 7 in the sliding hole 21; w is the maximum width of any one of the side molds 3.

[0054] In this embodiment, as Figure 6 and Figure 7 shown, the expression of the length l1 of the sliding connecting rod 7 is:

[0055] l1≥l + l2 + l3 (2);

[0056] Wherein, l1 is the length of the sliding connecting rod 7; l2 is the length of the spring 8 after compression; l3 is the minimum stable length of the sliding connecting rod 7 in the sliding hole 21, and l3≥2d, where d is the diameter of the sliding connecting rod 7.

[0057] In this embodiment, as Figure 6 and Figure 7 shown, the expression of the thickness h of the bottom of the lower mold 2 is:

[0058] h≥l + l3; (3);

[0059] Wherein, h is the thickness of the bottom of the lower mold 2.

[0060] For the carbon fiber arm stamping tooling of the present utility model, the lower die moving platform is slidably connected to the lower die through a sliding connecting rod, and a spring is provided for buffering. The lower die moving platform is also rotatably connected to the side die, forming a follow-up structure. An inner die made of a flexible material is laid on the lower die moving platform and the side die, which can be turned upwards with the side die during stamping processing, effectively ensuring the consistency between the laying structure of the carbon fiber material and the die structure during the stamping and bending process, and avoiding wrinkles generated by the carbon fiber material under insufficient restraint and damage defects caused by excessive external force extrusion.

[0061] It should be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant is intended to cover non-exclusive inclusion, so that an article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the article or device comprising the element. Similar words such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The orientation or positional relationship indicated by "upper", "lower", "left", "right", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the present invention.

[0062] The above content is a further detailed description of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is only limited to these descriptions. For those of ordinary skill in the technical field to which the present invention pertains, without departing from the concept of the present invention, several simple deductions or substitutions can be made, and all should be regarded as belonging to the protection scope of the present invention.

Claims

1. A carbon fiber arm stamping tooling, characterized in that Comprising: an upper die (1), a lower die (2), side dies (3), a movable lower die platform (4), an inner die (6), sliding connecting rods (7) and springs (8); wherein, the upper die (1) and the lower die (2) can approach or move away from each other relatively; a forming cavity is arranged in the lower die (2), and a plurality of sliding holes (21) are arranged vertically at the bottom of the lower die (2), and all the plurality of sliding holes (21) communicate with the forming cavity; the number of the sliding connecting rods (7) is equal to that of the sliding holes (21), and they are slidably connected in one-to-one correspondence; the movable lower die platform (4) is arranged in the forming cavity and is respectively connected to a plurality of the sliding connecting rods (7), and each of the sliding connecting rods (7) is sleeved with a spring (8), and two ends of the spring (8) respectively abut between the movable lower die platform (4) and the bottom surface of the forming cavity; there are at least two side dies (3), all the side dies (3) are symmetrically arranged, and are respectively rotatably connected to the side surface of the movable lower die platform (4), and when the movable lower die platform (4) moves downward in the vertical direction, all the side dies (3) turn upward; the inner die (6) is placed on the movable lower die platform (4) and at least covers the top surfaces of the movable lower die platform (4) and all the side dies (3), and the inner die (6) is made of a flexible material.

2. The carbon fiber arm stamping tooling according to claim 1, characterized in that All the side dies (3) are rotatably connected to the movable lower die platform (4) through hinges (5).

3. The carbon fiber arm stamping tooling according to claim 2, characterized in that, Each side die (3) is connected to the movable lower die platform (4) through at least two hinges (5); the hinges (5) are respectively connected to the bottom surfaces of the side die (3) and the movable lower die platform (4).

4. The carbon fiber arm stamping tooling according to claim 1, wherein There are at least three sliding holes (21), two of the sliding holes (21) are located on the same side of the lower die (2), and all the remaining sliding holes (21) are located on the other side of the lower die (2).

5. The carbon fiber arm stamping tooling according to claim 1, wherein One end of each sliding connecting rod (7) is provided with a thread and is connected to the movable lower die platform (4) through the thread.

6. The carbon fiber arm stamping tooling according to claim 1, wherein, Further comprising: a cooling plate (9), the cooling plate (9) is embedded on both sides of the lower die (2); the projection length of at least one side of the cooling plate (9) in the vertical direction is greater than the maximum projection length of the carbon fiber arm to be processed in the vertical direction.

7. The carbon fiber arm stamping tooling according to claim 6, characterized in that, When the side dies (3) turn upward, the sum of the contact areas between the lower die (2) and all the side dies (3) is smaller than the sum of the projection areas of the cooling plates (9) on both sides in the horizontal direction.

8. The carbon fiber arm stamping tooling according to claim 1, wherein, The expression of the maximum sliding distance l of the sliding connecting rod (7) in the sliding hole (21) is: l≥w； wherein, l is the maximum sliding distance of the sliding connecting rod (7) in the sliding hole (21); w is the maximum width of any one of the side dies (3).

9. The carbon fiber arm stamping tooling according to claim 8, wherein, The expression of the length l1 of the sliding connecting rod (7) is: l1≥l+l2+l3； Among them, l1 is the length of the sliding connecting rod (7); l2 is the length of the spring (8) after compression; l3 is the minimum stable length of the sliding connecting rod (7) in the sliding hole (21), and l3 ≥ 2d, where d is the diameter of the sliding connecting rod (7).

10. The carbon fiber arm stamping tooling according to claim 9, characterized in that, The expression for the thickness h of the bottom of the lower mold (2) is as follows: h≥l+l3； Among them, h is the thickness of the bottom of the lower mold (2).

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