An apparatus and method for quick changing of molding test molds

Abstract

This invention provides an apparatus and method for quickly changing forming test molds, including a coaxially arranged connecting device, an upper mold clamping device, and a lower mold clamping device. The connecting device connects the upper mold clamping device to the upper platform of a hydraulic press. The upper mold clamping device clamps the existing die at its upper part and the die to be used at its lower part. The lower mold clamping device clamps the existing blank holder at its lower part and the blank holder to be used at its upper part. This invention can be applied to existing test molds without disassembling the existing mold; a new test can be quickly started by installing only the blank holder and the die. After the test, the device can be quickly disassembled without affecting the original test, effectively reducing the time and workload of mold replacement.

Description

Technical Field

[0001] This invention relates to the field of metal sheet forming technology, specifically to sheet forming testing machines, and more particularly to a device and method for quickly changing forming test molds. Background Technology

[0002] The sheet metal forming testing machine includes a set of forming test molds located on the upper and lower platforms of the hydraulic press. The forming test molds include an upper mold base, a lower mold base, a pressure ring, and a die. The punch passes through the central hole of the lower mold base, and then the die and punch cooperate to extrude the sheet metal into shape. During different forming tests, the upper mold base, lower mold base, pressure ring, and die need to be replaced. When disassembling the mold, at least two people are required to disassemble the existing mold, move the mold away from the testing machine, move the new mold onto the testing machine, and assemble the test mold. After the test, the original mold needs to be replaced to continue the previous test work. The workload is relatively high and the time is relatively long. Summary of the Invention

[0003] In view of the above-mentioned technical problems, an apparatus and method for quickly changing molding test molds are provided.

[0004] The technical means employed in this invention are as follows: A device for quickly changing forming test molds includes a coaxially arranged connecting device, an upper mold clamping device, and a lower mold clamping device; The upper mold clamping device includes an upper clamping base. Multiple first upper sliding rods and multiple first lower sliding rods are evenly arranged around the top and bottom sidewalls of the upper clamping base along its axis. Each of the first upper sliding rods and the first lower sliding rods is slidably connected to a first upper positioning end and a first lower positioning end, and each of the first upper positioning end and the first lower positioning end is fitted with a set bolt. The first upper positioning end is used to fit the existing die of the upper mold base, and the first lower positioning end fits the die to be used. The upper mold base is fixed to the lower surface of the upper platform of the hydraulic press. The lower mold clamping device includes a lower clamping base, which sits on the existing pressure ring of the lower mold base and supports the pressure ring to be used. The lower clamping base has a through hole at its center for the punch to pass through. Multiple second upper sliding rods and multiple second lower sliding rods are evenly arranged around the top and bottom sidewalls of the lower clamping base along their respective axes. Each of the second upper and lower sliding rods has a second upper positioning end and a second lower positioning end that are slidably connected to it, and a set bolt is installed on each of the second upper and lower positioning ends. The second upper positioning end is used to fit the pressure ring to be used, and the first lower positioning end is used to fit the existing pressure ring. The connecting device includes a connecting rod, the bottom of which is fixedly connected to the upper clamping base by bolts; the upper part of the connecting rod is used to pass through the upper platform of the hydraulic press, and the upper end of the connecting rod is fitted with a fixing plate located above the upper platform of the hydraulic press. The fixing plate is fixedly connected to the upper platform of the hydraulic press by fastening bolts. A fixing rod passes radially through the fixing plate and the top end of the connecting rod to fix the fixing plate to the connecting rod.

[0005] Furthermore, the upper and lower surfaces of the first upper sliding rod and the first lower sliding rod do not exceed the upper and lower surfaces of the upper clamping base.

[0006] Furthermore, the upper and lower surfaces of the second upper sliding rod and the second lower sliding rod do not exceed the upper and lower surfaces of the lower clamping base.

[0007] Furthermore, the first upper positioning end and the second upper positioning end are vertically arranged, and their tops extend upwards; the first lower positioning end and the second lower positioning end are vertically arranged, and their bottoms extend downwards; the inner top of the first upper positioning end and the inner bottom of the second upper positioning end and the inner bottom of the first lower positioning end and the second lower positioning end respectively have contact points adapted to the side wall recesses of the existing die, the waiting pressure ring, the waiting die, and the existing pressure ring.

[0008] The present invention also discloses a method for quickly changing a molding test mold, the method employing the above-mentioned apparatus, comprising: Place the lower clamping base on the existing pressure ring, and place the pressure ring to be used on the lower clamping base so that the central axes of the pressure ring to be used and the existing pressure ring coincide. Adjust the positions of the second upper positioning end and the second lower positioning end so that the second upper positioning end and the second lower positioning end are respectively in contact with the pressure ring to be used and the existing pressure ring, and fix the positions of the second upper positioning end and the second lower positioning end with the set bolt. Place the die to be used on the blank holder ring, place the upper clamping base on the die to be used, and connect the connecting rod to the upper clamping base with bolts; move the lower platform of the hydraulic press upward until the connecting rod passes through the existing die and the upper platform of the hydraulic press, and fit the fixing plate over the top of the connecting rod and fix them together with the fixing rod; Align the central axes of the die and the pressure ring to be used, adjust the position of the first lower positioning end so that the first lower positioning end fits against the die, and fix the position of the first lower positioning end with the set bolt. Move the lower platform of the hydraulic press upward until the upper clamping base is pressed against the existing die and there is pressure. Adjust the position of the first upper positioning end to fit the first upper positioning end against the existing die and fix the position of the first upper positioning end with the set bolt. Adjust the fastening bolts on the fixing plate to fix the upper clamping base in the current position. Place the sample for testing.

[0009] Furthermore, before placing the sample for testing, based on the test parameters obtained from the existing mold, the zero-point positions of the blank holder ring and the punch to be used are modified: The zero point position of the punch to be used = the zero point position of the existing pressure ring + the thickness of the lower clamping base + the thickness of the pressure ring to be used; The zero point position of the blank holder to be used = the zero point position of the existing blank holder - the thickness of the upper clamping base - the thickness of the die to be used.

[0010] Furthermore, the zero-point positions of the blank holder ring and the die punch are modified and then corrected: Close the mold, set the blank holder force to 2~4Kn, and observe the zero point value of the blank holder ring to be used. If the current value is not equal to zero and exceeds the equipment error, the zero point needs to be readjusted according to the following formula until the zero point value of the blank holder ring to be used is equal to zero: Zero point position of the punch to be used = zero point position of the existing pressure ring + thickness of the lower clamping base + thickness of the pressure ring to be used + / - zero point correction value; Zero point position of the blank holder to be used = zero point position of the existing blank holder - thickness of the upper clamping base - thickness of the die to be used + / - zero point correction value.

[0011] Compared with the prior art, the present invention has the following advantages: This invention allows for the rapid initiation of new tests without disassembling existing test molds. By simply installing the pressure ring and die, the device can be quickly disassembled after the test without affecting the original test. This effectively reduces the time required to change molds, improves the efficiency of changing molds when conducting different tests, and reduces the workload of workers.

[0012] Based on the above reasons, this invention can be widely promoted in fields such as sheet metal forming testing machines. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0014] Figure 1 This is a schematic diagram of the structure of a device for quickly changing forming test molds according to the present invention.

[0015] Figure 2 This is an exploded view of the connecting device and the upper mold clamping device of the present invention.

[0016] Figure 3 This is a schematic diagram of the assembled structure of the device for quickly changing forming test molds according to the present invention.

[0017] In the diagram: 1. Connecting rod; 2. Fixing rod; 3. Fastening bolt; 4. Fixing plate; 5. First upper positioning end; 6. Set bolt; 7. First upper sliding rod; 8. Upper clamping base; 9. First lower sliding rod; 10. First lower positioning end; 11. Second upper positioning end; 12. Second upper sliding rod; 13. Lower clamping base; 14. Second lower sliding rod; 15. Second lower positioning end; 16. Upper mold base; 17. Existing die; 18. Die to be used; 19. Blank holder to be used; 20. Existing blank holder; 21. Lower mold base; 22. Lower platform of hydraulic press; 23. Upper platform of hydraulic press. Detailed Implementation

[0018] It should be noted that, unless otherwise specified, the embodiments and features described in the present invention can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0019] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the present invention or its application or use. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following figures denote similar items; therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0022] In the description of this invention, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is generally based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this invention and simplifying the description. Unless otherwise stated, these directional terms 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, and therefore should not be construed as a limitation on the scope of protection of this invention. The directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0023] For ease of description, spatial relative terms such as "above," "over," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation besides the orientation of the device as described in the figures. For example, if the device in the figures is inverted, a device described as "above" or "above" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0024] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore should not be construed as limiting the scope of protection of this invention.

[0025] Example 1 like Figures 1-3 As shown, a device for quickly changing forming test molds includes a coaxially arranged connecting device, an upper mold clamping device, and a lower mold clamping device. The upper mold clamping device includes an upper clamping base 8. Multiple first upper sliding rods 7 and multiple first lower sliding rods 9 are evenly arranged around the top and bottom sidewalls of the upper clamping base 8 along its axis. Each of the first upper sliding rod 7 and the first lower sliding rod 9 has a first upper positioning end 5 and a first lower positioning end 10 slidably connected to it, and each of the first upper positioning end 5 and the first lower positioning end 10 is equipped with a set bolt 6. The upper and lower surfaces of the first upper sliding rods 7 and the first lower sliding rods 9 do not exceed the upper and lower surfaces of the upper clamping base 8. The first upper positioning end 5 is used to fit the existing die 17 of the upper mold base 16, and the first lower positioning end 10 fits the die 18 to be used. The upper mold base 16 is fixed to the lower surface of the upper platform 23 of the hydraulic press. The lower mold clamping device includes a lower clamping base 13, which sits on the existing pressure ring 20 of the lower mold base 21 and supports the pressure ring 19 to be used. The lower clamping base 13 has a through hole at its center for the punch to pass through. Multiple second upper sliding rods 12 and multiple second lower sliding rods 14 are evenly arranged around the top and bottom sidewalls of the lower clamping base 13 around their axes. Each of the second upper sliding rod 12 and the second lower sliding rod 14 has a second upper positioning end 11 and a second lower positioning end 15 slidably connected to it, and a set bolt 6 is installed on each of the second upper positioning end 11 and the second lower positioning end 15. The upper and lower surfaces of the second upper sliding rod 12 and the second lower sliding rod 14 do not exceed the upper and lower surfaces of the lower clamping base. The second upper positioning end is used to fit the pressure ring 19 to be used, and the first lower positioning end is used to fit the existing pressure ring 20. The first upper positioning end 5 and the second upper positioning end 11 are vertically arranged and their tops extend upward; the first lower positioning end 10 and the second lower positioning end 15 are vertically arranged and their bottoms extend downward; the inner tops of the first upper positioning end 5 and the second upper positioning end 11, and the inner bottoms of the first lower positioning end 10 and the second lower positioning end 15, respectively have contact points that are adapted to the side wall recesses of the existing die 17, the waiting pressure ring 19, the waiting die 18, and the existing pressure ring 20.

[0026] The connecting device includes a connecting rod 1, the bottom of which is fixedly connected to the upper clamping base 8 by bolts; the upper part of the connecting rod 1 is used to pass through the upper platform 23 of the hydraulic press, and the upper end of the connecting rod 1 is fitted with a fixing plate 4 located above the upper platform 23 of the hydraulic press. The fixing plate 4 is fixedly connected to the upper platform 23 of the hydraulic press by fastening bolts 3. A fixing rod 2 passes radially through the fixing plate 4 and the top end of the connecting rod 1 to fix the fixing plate 4 to the connecting rod 1.

[0027] Example 2 like Figures 1-3 As shown, the present invention also discloses a method for quickly changing a molding test mold, the method employing the apparatus described in Example 1, comprising: 1. Place the lower clamping base 13 on the existing pressure ring 20, and place the pressure ring 19 to be used on the lower clamping base 13, so that the central axis of the pressure ring 19 to be used and the existing pressure ring 20 coincides. Adjust the position of the second upper positioning end 11 and the second lower positioning end 15 radially so that the contact points of the second upper positioning end 11 and the second lower positioning end 15 are respectively in contact with the recesses of the pressure ring 19 to be used and the existing pressure ring 20, and fix the position of the second upper positioning end 11 and the second lower positioning end 15 with the set bolt 6. 2. Place the waiting die 18 on the waiting pressure ring 19, place the upper clamping base 8 on the waiting die 18, and connect the connecting rod 1 to the upper clamping base 8 with bolts; move the lower platform 22 of the hydraulic press upward until the connecting rod 1 passes through the existing die 17 and the upper platform 23 of the hydraulic press, and fit the fixing plate 4 over the top of the connecting rod 1 and fix it together with the fixing rod 2; 3. Use a centering ring or other device to make the central axis of the die 18 to be used and the pressure ring 19 to be used coincide, adjust the position of the first lower positioning end 10 so that the contact point of the first lower positioning end 10 fits the recess of the die 18 to be used, and fix the position of the first lower positioning end 10 with the set bolt 6. 4. Move the lower platform 22 of the hydraulic press upward until the upper clamping base 8 is pressed against the existing die 17. Adjust the position of the first upper positioning end 5 so that the contact point of the first upper positioning end 5 is in contact with the recess of the existing die 17, and fix the position of the first upper positioning end 5 with the set bolt 6. Adjust the fastening bolts 3 on the fixing plate 4 so that the upper clamping base 8 is fixed in the current position. 5. Based on the test parameters of the existing mold, modify the zero-point positions of the blank holder 19 and the punch: The zero point position of the punch to be used = the zero point position of the existing pressure ring 20 + the thickness of the lower clamping base 13 + the thickness of the pressure ring to be used 19; The zero point position of the blanking ring 19 to be used = the zero point position of the existing blanking ring 20 - the thickness of the upper clamping base 8 - the thickness of the die to be used 18.

[0028] After modifying the zero-point positions of the blank holder ring and the die punch, they are corrected: Start the hydraulic press to close the mold, set the blank holder force to 2~4KN, and observe the zero point value of the blank holder ring 19 to be used. If the current value is not equal to zero and exceeds the equipment error, the zero point needs to be readjusted according to the following formula until the zero point value of the blank holder ring to be used is equal to zero: Zero point position of the punch to be used = zero point position of the existing pressure ring 20 + thickness of the lower clamping base 13 + thickness of the pressure ring to be used 19 + / - zero point correction value; The zero point position of the waiting pressure ring 19 = the zero point position of the existing pressure ring 20 - the thickness of the upper clamping base 8 - the thickness of the waiting die 18 + / - zero point correction value.

[0029] 6. Place the sample for testing. If there are no abnormalities, the test can be carried out normally. Save the program. You can directly call the program when you use the equipment for testing in the future.

[0030] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for quickly changing molding test molds, characterized in that, It includes a coaxially arranged connecting device, an upper mold clamping device, and a lower mold clamping device; The upper mold clamping device includes an upper clamping base. Multiple first upper sliding rods and multiple first lower sliding rods are evenly arranged around the top and bottom sidewalls of the upper clamping base along its axis. Each of the first upper sliding rods and the first lower sliding rods is slidably connected to a first upper positioning end and a first lower positioning end, and each of the first upper positioning end and the first lower positioning end is fitted with a set bolt. The first upper positioning end is used to fit the existing die of the upper mold base, and the first lower positioning end fits the die to be used. The upper mold base is fixed to the lower surface of the upper platform of the hydraulic press. The lower mold clamping device includes a lower clamping base, which sits on the existing pressure ring of the lower mold base and supports the pressure ring to be used. The lower clamping base has a through hole at its center for the punch to pass through. Multiple second upper sliding rods and multiple second lower sliding rods are evenly arranged around the top and bottom sidewalls of the lower clamping base along their respective axes. Each of the second upper and lower sliding rods has a second upper positioning end and a second lower positioning end that are slidably connected to it, and a set bolt is installed on each of the second upper and lower positioning ends. The second upper positioning end is used to fit the pressure ring to be used, and the first lower positioning end is used to fit the existing pressure ring. The connecting device includes a connecting rod, the bottom of which is fixedly connected to the upper clamping base by bolts; the upper part of the connecting rod is used to pass through the upper platform of the hydraulic press, and the upper end of the connecting rod is fitted with a fixing plate located above the upper platform of the hydraulic press. The fixing plate is fixedly connected to the upper platform of the hydraulic press by fastening bolts. A fixing rod passes radially through the fixing plate and the top end of the connecting rod to fix the fixing plate to the connecting rod.

2. The device for quickly changing forming test molds according to claim 1, characterized in that, The upper and lower surfaces of the first upper sliding rod and the first lower sliding rod do not exceed the upper and lower surfaces of the upper clamping base.

3. The device for quickly changing molding test molds according to claim 1, characterized in that, The upper and lower surfaces of the second upper sliding rod and the second lower sliding rod do not exceed the upper and lower surfaces of the lower clamping base.

4. The device for quickly changing molding test molds according to claim 1, characterized in that, The first upper positioning end and the second upper positioning end are vertically arranged, and their tops extend upwards; The first lower positioning end and the second lower positioning end are vertically arranged and their bottoms extend downwards; the top inner side of the first upper positioning end and the second upper positioning end, and the bottom inner side of the first lower positioning end and the second lower positioning end respectively have contact points that are adapted to the side wall recesses of the existing die, the waiting pressure ring, the waiting die and the existing pressure ring.

5. A method for quickly changing a molding test mold, characterized in that, The method employs the apparatus described in any one of claims 1 to 4, comprising: Place the lower clamping base on the existing pressure ring, and place the pressure ring to be used on the lower clamping base so that the central axes of the pressure ring to be used and the existing pressure ring coincide. Adjust the positions of the second upper positioning end and the second lower positioning end so that the second upper positioning end and the second lower positioning end are respectively in contact with the pressure ring to be used and the existing pressure ring, and fix the positions of the second upper positioning end and the second lower positioning end with the set bolt. Place the die to be used on the blank holder ring, place the upper clamping base on the die to be used, and connect the connecting rod to the upper clamping base with bolts; move the lower platform of the hydraulic press upward until the connecting rod passes through the existing die and the upper platform of the hydraulic press, and fit the fixing plate over the top of the connecting rod and fix them together with the fixing rod; Align the central axes of the die and the pressure ring to be used, adjust the position of the first lower positioning end so that the first lower positioning end fits against the die, and fix the position of the first lower positioning end with the set bolt. Move the lower platform of the hydraulic press upward until the upper clamping base is pressed against the existing die and there is pressure. Adjust the position of the first upper positioning end to fit the first upper positioning end against the existing die and fix the position of the first upper positioning end with the set bolt. Adjust the fastening bolts on the fixing plate to fix the upper clamping base in the current position. Place the sample for testing.

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