Efficient metal strip bulging test die

Abstract

The invention discloses an efficient metal strip bulging test die which comprises a male die, a female die and a lubricating mechanism, the male die is arranged in a working cavity of a base, the male die comprises an adjustable punch and a connecting column, the connecting column is arranged in the center of the working cavity, the adjustable punch is detachably connected with the top of the connecting column, and the adjustable punch is arranged in the working cavity. The female die can move relative to the male die to enter the working cavity to punch a plate on the male die, the lubricating mechanism comprises an oil spraying pipe and a conveying pipe which are arranged in the working cavity around the connecting column, and the conveying pipe is communicated with the oil spraying pipe to supply oil to the oil spraying pipe. The efficient metal strip bulging test mold provided by the invention has the advantages of high forming quality and high experimental efficiency.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of bulging test equipment, and particularly relates to a high-efficiency bulging test die for metal strip. BACKGROUND

[0002] The main reason for irregular cracking of the metal strip in the bulging process is the gap between the punch and the die, and the optimal gap is often related to the thickness of the sheet. Most of the current bulging test equipment cannot adjust the distance between the punch and the die, and before the experiment, the punch is usually manually coated with oil. The manual oil coating cannot achieve uniform coating, and the efficiency is low. SUMMARY

[0003] The present application aims to at least solve one of the problems in the related art. To this end, the embodiments of the present application provide a high-efficiency bulging test die for metal strip, which has the advantages of high forming quality and high experimental efficiency.

[0004] The high-efficiency bulging test die for metal strip according to the embodiments of the present application comprises a punch, a die and a lubricating mechanism. The punch is arranged in a working cavity of a base. The punch comprises an adjustable punch and a connecting column. The connecting column is arranged at the center of the working cavity, and the adjustable punch is detachably connected to the top of the connecting column. The die can move relative to the punch into the working cavity to stamp the sheet on the punch. The lubricating mechanism comprises an oil injection pipe arranged around the connecting column in the working cavity and a delivery pipe. The delivery pipe is in communication with the oil injection pipe to supply oil to the oil injection pipe.

[0005] The high-efficiency bulging test die for metal strip according to the embodiments of the present application has the advantages of high forming quality and high experimental efficiency. The adjustable punch and the automatic oil injection solve the problem of easy cracking of the metal strip at the die opening and the side edge, and the lubrication process is automated, achieving an efficient and automatic bulging test process, and significantly improving the forming quality and the test efficiency. According to the nominal value of a batch of strips, a suitable punch is matched to achieve the optimal gap, avoid the cracking of the sheet at the die opening and the side edge, and ensure the efficiency of the test.

[0006] In some embodiments, two groups of nozzles are arranged in the oil injection pipe. The first group of nozzles is directed towards the die, and the second group of nozzles is directed towards the top of the connecting column. The first group and the second group of nozzles are uniformly distributed along the circumferential direction of the oil injection pipe.

[0007] In some embodiments, the angle between the injection direction of the first group of nozzles and the axis direction of the punch is 30-45 degrees, and the angle between the injection direction of the second group of nozzles and the axis direction of the connecting column is 30-45 degrees.

[0008] In some embodiments, the first end of the adjustable punch is a hemispherical protrusion, the second end of the adjustable punch is provided with a positioning hole, and the top of the connecting column enters the positioning hole to fix the adjustable punch.

[0009] In some embodiments, an electromagnet is arranged in the top of the connecting column and in the positioning hole, respectively. The adjustable punch is quickly positioned and magnetically fixed with the connecting column through the electromagnet.

[0010] In some embodiments, a cooling channel is arranged in the connecting column, the inlet and outlet of the cooling channel are located at the bottom of the connecting column, and the cooling channel is arranged in a spiral in the connecting column.

[0011] In some embodiments, a collection groove is further arranged around the connecting column, and the collection groove is arranged on the base to recover lubricating oil.

[0012] In some embodiments, a filter screen is further arranged, the filter screen is arranged at the top of the collection groove to close the collection groove, the filter screen is fixed to the collection groove through buckling, and the collection groove is connected to the conveying pipe through a pipeline.

[0013] In some embodiments, a pressing rod is arranged beside the die, and the pressing rod extends in a horizontal direction.

[0014] In some embodiments, the lubricating mechanism further comprises an oil tank, an oil pump and an electromagnetic valve, and the oil pump and the electromagnetic valve are arranged on the conveying pipe. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 FIG. 1 is a structural schematic diagram of a high-efficiency metal strip bulging test mold according to an embodiment of the present application.

[0016] Figure 2 FIG. 2 is a sectional schematic diagram of FIG. 1. Figure 2

[0017] Figure 3 FIG. 3 is a top schematic diagram of a high-efficiency metal strip bulging test mold according to an embodiment of the present application.

[0018] Figure 4 FIG. 4 is a sectional schematic diagram of a base of a high-efficiency metal strip bulging test mold according to an embodiment of the present application.

[0019] Reference signs: 1, die; 2, punch; 21, adjustable punch; 22, connecting column; 23, positioning hole; 3, oil injection pipe; 31, injection port; 4, pressing rod; 5, plate; 6, base. DETAILED DESCRIPTION

[0020] ​Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the embodiments described are exemplary and should not be construed to limit the present application.

[0021] The efficient metal strip bulging test die according to the embodiments of the present application comprises a punch 2, a die 1 and a lubricating mechanism, the punch 2 is arranged in the working cavity of the base, the punch 2 comprises an adjustable punch 21 and a connecting column 22, the connecting column 22 is arranged in the center of the working cavity, the adjustable punch 21 is detachably connected with the top of the connecting column 22, the die 1 can move into the working cavity relative to the punch 2 to stamp the plate 5 on the punch 2, the lubricating mechanism comprises an oil injection pipe 3 and a delivery pipe, the oil injection pipe 3 is arranged around the connecting column 22 in the working cavity, the delivery pipe is connected with the oil injection pipe 3 to send oil to the oil injection pipe 3. By replacing the adjustable punch 21, the working range of the test die can be increased, and more plates 5 can be subjected to bulging test. The adjustable punch 21 of various specifications makes it unnecessary to manufacture the punch 2 separately, which is convenient to replace and reduces the cost of the die. The die 1 realizes fine bulging through stamping by cooperation of a servo motor and a ball screw. The oil injection pipe 3 surrounds the connecting column 22 to send oil to the plate 5 and the punch 2 to realize uniform and efficient lubrication, which reduces the friction in the forming process and also has a certain cooling effect.

[0022] In some embodiments, two groups of nozzles 31 are arranged in the oil injection pipe 3, the first group of nozzles 31 is directed towards the die 1, and the second group of nozzles is directed towards the top of the connecting column 22, the first group and the second group of nozzles 31 are uniformly distributed along the circumferential direction of the oil injection pipe 3. The axial extension lines of the two groups of nozzles 31 intersect. The first group of nozzles 31 sprays lubricating oil in the form of oil mist to cover the annular area of the inlet of the forming cavity of the die 1, realizing surface lubrication and avoiding insufficient lubrication to cause the edge of the plate 5 to crack due to friction.

[0023] Specifically, the two groups of nozzles 31 are arranged around the connecting column 22, the first group and the second group are arranged in sequence in the vertical direction, the first group is obliquely directed downwards, and the second group is obliquely directed upwards. Arranging the nozzles 31 around the connecting column 22 can eliminate the lubrication blind area and ensure uniform lubrication everywhere. If the nozzles 31 are unevenly distributed, the pressure of the nozzles 31 close to the oil inlet will be too high and the oil output will be too large, the pressure of the nozzles 31 far from the oil inlet will be too low and the oil output will be too small, resulting in uneven lubrication. The first group and the second group of nozzles 31 can realize differential oil supply and reduce oil waste.

[0024] In some embodiments, the angle between the first group of nozzles 31 and the axis direction of the punch 2 is 30-45 degrees, and the angle between the second group of nozzles 31 and the axis direction of the connecting column 22 is 30-45 degrees.

[0025] Specifically, when the included angle is 45 degrees, the diffusion radius of the sprayed oil mist is the largest, and when the included angle is 30 degrees, the oil mist spraying is more concentrated, and the adhesion is stronger. Adjusting the spray angle can ensure that the oil mist can completely cover the inlet area, and will not cause the oil to splash to the non-lubricated area outside the die 1 due to excessive diffusion. The two groups of nozzles 31 form uniform oil films at the inlet of the die 1 forming cavity and the mating surface of the connecting column 22 and the punch, respectively, to reduce the risk of edge cracking of the sheet 5 and reduce the friction scratches between the punch and the sheet 5.

[0026] Optionally, the first group and the second group of nozzles 31 are provided with nozzles and adjusting sleeves, the nozzles are rotationally connected with the adjusting sleeves, and the spray angle can be adjusted by rotating the nozzles. The motor is connected with one end of the nozzle to realize electrically driven angle adjustment and realize automatic adjustment. The adjusting sleeve is connected with the oil injection pipe 3 to realize fixation.

[0027] In some embodiments, the first end of the adjustable punch 21 is a semispherical protrusion, the second end of the adjustable punch 21 is provided with a positioning hole 23, and the top of the connecting column 22 enters the positioning hole 23 to fix the adjustable punch 21.

[0028] Specifically, the top of the connecting column 22 is a cylindrical structure, and the diameter of the top of the connecting column 22 is consistent with or slightly smaller than the diameter of the positioning hole 23. The top of the connecting column 22 enters the positioning hole 23 to support the adjustable punch 21 and limit the movement of the adjustable punch 21 in the horizontal direction.

[0029] Optionally, the side surface of the top of the connecting column 22 is provided with a limiting hole, a lock pin is arranged in the limiting hole in a sliding manner, and a compression spring is fixed in the limiting hole and pushes the lock pin to move outward of the connecting column 22. The lock hole is arranged on the hole wall of the positioning hole 23 of the adjustable punch 21, and the lock pin is pushed into the lock hole by the compression spring to lock the adjustable punch 21 and the connecting column 22. A reserved hole is arranged beside the adjustable punch 21, a jack is inserted into the reserved hole to push the lock pin back into the limiting hole, and the adjustable punch 21 can be removed.

[0030] In some embodiments, an electromagnet is arranged in the top of the connecting column 22 and the positioning hole 23, respectively. The adjustable punch 21 is quickly positioned and magnetically attached to the connecting column 22 by the electromagnet.

[0031] Specifically, a circular groove is arranged at the center of the end face of the top of the connecting column 22, and the electromagnet is embedded in the circular groove, and the top surface of the electromagnet is flush with the end face of the top of the connecting column 22. The bottom or side of the positioning hole 23 is embedded in the electromagnet, the magnetism between the two electromagnets is opposite, and the connecting column 22 is magnetically adsorbed and fixed after entering the positioning hole 23. When the electromagnet is powered on, the two electromagnets will attract each other to complete the rapid coaxial positioning, and the connecting column 22 is completely inserted into the positioning hole 23, and the two electromagnets are magnetically adsorbed and fixed, avoiding the loosening of the adjustable punch 21 during the test process. The magnetic adsorption of the electromagnet can reduce the dependence on manual alignment, shorten the alignment time, and the magnetic adsorption fixing improves the reliability of the fixing, which can resist the influence of mold vibration on the fixing effect.

[0032] In some embodiments, a cooling channel is arranged in the connecting column 22, and the inlet and outlet of the cooling channel are located at the bottom of the connecting column 22. The cooling channel is spirally arranged in the connecting column 22.

[0033] Specifically, the cooling channel in the connecting column 22 spirally rises along the axial direction of the connecting column 22, which increases the heat exchange area between the cooling medium and the connecting column 22. The inlet and outlet of the cooling channel are arranged at the bottom of the connecting column 22, i.e., one pipeline is fixed at the bottom of the connecting column 22, and the pipeline is folded and spirally wound. The inlet and outlet are arranged at the bottom of the connecting column 22 to facilitate the entry and exit of the cooling medium. During the test process, the cooling medium (such as cooling water or cooling oil) circulates in the cooling channel, which can timely remove the heat generated by the adjustable punch 21 and the connecting column 22 during the forming process.

[0034] In some embodiments, a collecting groove is further arranged around the connecting column 22, and the collecting groove is arranged on the base to recover the lubricating oil.

[0035] Specifically, the collecting groove is an annular groove. The groove bottom of the collecting groove can be a circular arc shape to avoid the accumulation of lubricating oil in the corner and facilitate cleaning. An oil return port is arranged at the lowest part of the collecting groove to discharge the lubricating oil. The collecting groove arranged on the base can recover the excess lubricating oil in the working cavity, reduce the waste of lubricating oil, and reduce pollution, and protect the connecting column 22. On the other hand, the collecting groove is arranged on the base, which reduces the overall weight of the base.

[0036] In some embodiments, a filter screen is further arranged, the filter screen is arranged at the top of the collecting groove to close the collecting groove, the filter screen is fixed with the collecting groove through buckling, and the collecting groove is connected with the conveying pipe through a pipeline.

[0037] Specifically, the collecting groove is annular, the filter screen is an annular filter screen, the size of the filter screen is consistent with that of the collecting groove, the edge of the annular filter screen is arranged with four elastic buckles, the inner side edge or the outer side edge of the corresponding collecting groove is provided with buckle holes, the buckles are pushed into the buckle holes to complete clamping, one end of the pipeline is communicated with the oil return port, and the other end is communicated with the conveying pipe, so that the recycled lubricating oil is returned to the conveying pipe to continue to be used as lubricating oil, and the lubricating cost is reduced. The existence of the filter screen avoids that large-particle impurities enter the pipeline.

[0038] In some embodiments, a pressing rod 4 is arranged beside the female die 1, and the pressing rod 4 extends in the horizontal direction.

[0039] Specifically, the pressing rod 4 is used to drive the female die 1 to rise, an operator can lift the female die 1 by pushing the pressing rod 4, or the pressing rod 4 is connected with a gas cylinder, and the gas cylinder is started to drive the female die 1 to automatically rise after the bulging test is completed. The pressing rod 4 is arranged beside the female die 1 to avoid collision with the connecting column 22 and the adjustable punch 21 during the up-and-down process of the pressing rod 4.

[0040] In some embodiments, the lubricating mechanism further comprises an oil tank, an oil pump and an electromagnetic valve, and the oil pump and the electromagnetic valve are arranged on the conveying pipe.

[0041] Specifically, the lubricating mechanism realizes accurate conveying of lubricating oil through the cooperation of the oil tank, the oil pump and the electromagnetic valve. The oil tank is used to store lubricating oil, the oil pump is started to convey the lubricating oil in the oil tank to the outside through the conveying pipe, and the electromagnetic valve is used to control the opening and closing of the conveying pipe. After a preset oil injection time is reached, the electromagnetic valve and the oil pump are sequentially powered off, the conveying pipeline is closed, and the residual lubricating oil is completely injected.

[0042] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0043] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first" and "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.

[0044] In the present application, unless specifically defined otherwise, the terms "mount", "connected", "connecting", "fixed", "unfixed", and the like are to be construed in a broad sense, for example, they can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection, or communication with each other; can be direct connection, or indirect connection via intermediate medium; can be internal communication of two elements, or interaction between two elements, unless otherwise specifically defined. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0045] In the present application, unless specifically defined otherwise, the first feature is "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact via an intermediate medium. Moreover, the first feature "on", "above" and "over" the second feature can be that the first feature is directly above or obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature "under", "below" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0046] In the present application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, different embodiments or examples described in the present specification and the features of different embodiments or examples can be combined and combined by those skilled in the art without contradiction.

[0047] Although the embodiments of the present application have been shown and described above, it should be understood that the above embodiments are exemplary and should not be construed as limiting the present application, and the changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the scope of the present application.

Claims

1. A high-efficiency metal strip bulging test mold, characterized in that, include: A punch is arranged in the working cavity of the base. The punch includes an adjustable punch and a connecting post. The connecting post is arranged in the center of the working cavity. The adjustable punch is detachably connected to the top of the connecting post. A die that can move relative to a punch and enter the working cavity to press the sheet metal on the punch; A lubrication mechanism, comprising an oil injection pipe and a delivery pipe arranged around the connecting column within the working chamber, wherein the delivery pipe is connected to the oil injection pipe for supplying oil to the oil injection pipe.

2. The high-efficiency metal strip bulging test mold according to claim 1, characterized in that, The oil injection pipe is provided with two sets of nozzles. The first set of nozzles sprays towards the concave mold, and the second set of nozzles sprays towards the top of the connecting column. The first and second sets of nozzles are evenly distributed along the circumferential direction of the oil injection pipe.

3. The high-efficiency metal strip bulging test mold according to claim 2, characterized in that, The angle between the spraying direction of the first group and the axial direction of the punch is 30-45 degrees, and the angle between the spraying direction of the second group and the axial direction of the connecting column is 30-45 degrees.

4. The high-efficiency metal strip bulging test mold according to claim 1, characterized in that, The first end of the adjustable punch is a hemispherical protrusion, and the second end of the adjustable punch is provided with a positioning hole. The top of the connecting post enters the positioning hole to fix the adjustable punch.

5. The high-efficiency metal strip bulging test mold according to claim 4, characterized in that, An electromagnet is arranged at the top of the connecting column and inside the positioning hole. The adjustable punch achieves rapid positioning and magnetic attraction and fixation with the connecting column through the electromagnet.

6. The high-efficiency metal strip bulging test mold according to claim 1, characterized in that, The connecting column is provided with a cooling channel inside, and the inlet and outlet of the cooling channel are located at the bottom of the connecting column. The cooling channel is spirally arranged inside the connecting column.

7. The high-efficiency metal strip bulging test mold according to claim 1, characterized in that, It also includes a collection trough arranged around the connecting column, the collection trough being arranged on the base for recovering lubricating oil.

8. The high-efficiency metal strip bulging test mold according to claim 7, characterized in that, It also includes a filter screen, which is arranged on top of the collection tank to close the collection tank. The filter screen is fixed to the collection tank by a snap fastener, and the collection tank is connected to the delivery pipe through a pipeline.

9. The high-efficiency metal strip bulging test mold according to claim 7, characterized in that, A pressure bar is provided on the side of the die, and the pressure bar extends in the horizontal direction.

10. The high-efficiency metal strip bulging test mold according to claim 1, characterized in that, The lubrication mechanism also includes an oil tank, an oil pump, and a solenoid valve, with the oil pump and the solenoid valve arranged on the delivery pipe.

Images