A die device for impact forming experimental research of a lying plate specimen used on a hopkinson bar

Abstract

The application belongs to the technical field of material dynamic mechanical property experiment clamp and provides a die device for impact forming experiment research of horizontal plate sample on a Hopkinson bar, which comprises a supporting part and an impact die part; the supporting part comprises a cushion block for placing the impact die part; the impact die part comprises a left impact die, a left pressing plate and a right pressing plate which are arranged on the cushion block correspondingly; the left pressing plate is located between the left impact die and the right pressing plate; and the left impact die is used for contacting with an incident rod of the Hopkinson bar. The die device for impact forming experiment research of horizontal plate sample on the Hopkinson bar has ideal use effect for impact forming experiment of difficult-to-deform plate materials under high strain rate.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of material dynamic mechanical property experiment clamp, and particularly relates to a die device for impact forming experiment research of a horizontal lying plate sample on a Hopkinson bar. BACKGROUND

[0002] Under dynamic load, the mechanical properties of materials are significantly related to the strain rate. The strain rate effect of the mechanical properties of materials caused by high amplitude and short duration pulse load is very important for the design and analysis of structures resisting dynamic load. The Hopkinson bar device can be used for testing the dynamic properties of materials, and is a commonly used device for detecting the stress-strain relationship of materials under high-speed impact load.

[0003] In the aerospace and automotive industries, difficult-to-deform materials are widely welcomed and applied due to their excellent performance, including making the whole lighter, good structural strength and stiffness, high specific strength, etc. Under the traditional low strain rate quasi-static forming method, the forming effect of difficult-to-deform materials is poor, so many high strain rate forming methods have been derived, including high-speed forming and flexible forming, including explosive forming, electro-hydraulic forming, electromagnetic forming, particle forming and hydraulic forming. Most of these materials are processed in the form of plates, and rapid forming processing under high strain rate is carried out.

[0004] Metal plate materials are widely used and in great demand. Not only is the impact forming of existing lightweight difficult-to-deform alloy plates urgently needed to be studied, but the impact forming of plate materials such as metal composite plates and stainless steel honeycomb plates also needs to be studied.

[0005] Especially, the currently used die device does not have ideal use effect in impact forming experiments of difficult-to-deform plate materials under high strain rate.

[0006] The study of the forming performance and its law of plate materials under impact load needs the help of experimental equipment, so an experimental device is needed, which is of great significance to the actual material research and application. SUMMARY

[0007] The present application provides a die device for impact forming experiment research of a horizontal lying plate sample on a Hopkinson bar, which aims to solve the problem that the currently used die device does not have ideal use effect in impact forming experiments of difficult-to-deform plate materials under high strain rate.

[0008] The application is achieved by a mold device for impact forming experimental research of a horizontal plate sample on a Hopkinson bar, comprising a supporting part and an impact mold part; the supporting part comprises a cushion block for placing the impact mold part; the impact mold part comprises a left impact mold, a left pressing plate and a right pressing plate arranged correspondingly on the cushion block; the left pressing plate is located between the left impact mold and the right pressing plate; the left impact mold is used for contacting with an incident rod of the Hopkinson bar; the right impact mold is arranged between the left pressing plate and the right pressing plate and used for contacting with a transmission rod of the Hopkinson bar; and the left pressing plate and the right impact mold are used for placing a plate.

[0009] Preferably, the left impact mold is provided with a pressing ring in contact with the left pressing plate on one side of the left impact mold; a plurality of guide columns are fixedly installed on the side of the pressing ring away from the left pressing plate; and a plurality of guide holes are formed in the left impact mold for inserting the plurality of guide columns.

[0010] Preferably, a spring is arranged in each of the plurality of guide holes and in contact with the inner wall of the guide hole and the end of the guide column.

[0011] Preferably, the plurality of guide columns are hollow; a plurality of assembly blind holes are formed in the side of the left impact mold away from the left pressing plate; the plurality of assembly blind holes are arranged in communication with the plurality of guide holes; a connecting bolt is arranged in each of the plurality of guide columns and extends into the assembly blind hole through the corresponding guide hole and the spring; and a nut is threadedly installed on the end of the connecting bolt in the assembly blind hole.

[0012] Preferably, a replacement convex mold is installed at the center of the cylinder of the left impact mold; and a replacement concave mold is installed at the center of the cylinder of the right impact mold; the replacement convex mold and the replacement concave mold are arranged correspondingly for impacting the plate.

[0013] Preferably, a groove is formed in the left pressing plate and the right pressing plate for placing the right impact mold and the plate; the plate is pressed between the left pressing plate and the right impact mold; and the left pressing plate, the right pressing plate and the right impact mold are locked by a die bolt.

[0014] Preferably, an arc-shaped half cavity with the same diameter as the left impact mold is formed in the cushion block; the two sides of the arc-shaped half cavity are arranged in a stepped manner; the left impact mold is located above the step of the arc-shaped half cavity; and the left pressing plate, the right pressing plate and the right impact mold are located below the step of the arc-shaped half cavity.

[0015] Preferably, a through hole is formed in the left impact mold and the right pressing plate for the Hopkinson bar to pass through and contact the replacement convex mold and the replacement concave mold.

[0016] Preferably, the replacement convex mold and the left impact mold and the replacement concave mold and the right impact mold are in transition fit.

[0017] Preferably, the plate material is disc-shaped and has a thickness less than 2 mm, and the left and right impact dies are made of die steel.

[0018] Compared with the related art, the mold device for impact forming experimental research of a horizontal plate sample on a Hopkinson bar has the following beneficial effects:

[0019] Compared with the prior art, the mold device for impact forming experimental research of a horizontal plate sample on a Hopkinson bar has the following beneficial effects: BRIEF DESCRIPTION OF DRAWINGS

[0020] Fig. 1 is a schematic diagram of the overall structure of a mold device for impact forming experimental research of a horizontal plate sample on a Hopkinson bar provided by the present application;

[0021] Fig. 2 is a schematic diagram of the overall structure of a mold device for impact forming experimental research of a horizontal plate sample on a Hopkinson bar provided by the present application;

[0022] Reference signs: 1, pad; 2, left impact die; 3, pressure ring; 4, right impact die; 5, spring; 6, plate material; 7, replacement punch; 8, replacement die; 9, connecting bolt; 10, nut; 11, left pressing plate; 12, right pressing plate; 13, mold closing bolt. DETAILED DESCRIPTION

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the description herein is for describing particular embodiments only and is not intended to be limiting of the application; the description and the claims herein contain provisions relating to articles which are implemented or utilized with or by apparatuses, and that the terms shall not be considered as referring merely to the related articles or apparatuses themselves, but to the articles in their broadest form. The description and the claims herein contain provisions relating to articles which are implemented or utilized with or by apparatuses, and that the terms shall not be considered as referring merely to the related articles or apparatuses themselves, but to the articles in their broadest form. The terms "comprise", "comprising", "include", "including", and "has", "having", their conjugates and derivatives, are used herein to indicate a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises, includes, has, or includes several steps or several components can also comprise, include, have, or include other steps or other components not expressly listed or otherwise described herein. The terms "first", "second", and the like, do not denote any order, quantity, combination, or importance, but are used to identify different objects.

[0024] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive or alternative embodiments. It is expressly understood that the embodiments described herein are merely examples from a much larger number of embodiments that can be claimed.

[0025] The embodiment of the application provides a die device for impact forming experimental research of a horizontal lying plate sample used on a Hopkinson bar, as shown in the drawings. Figs. 1-2 The die device for impact forming experimental research of a horizontal lying plate sample used on a Hopkinson bar comprises a supporting part and an impact die part; the supporting part comprises a cushion block 1 for placing the impact die part, the impact die part comprises a left impact die 2, a left pressing plate 11 and a right pressing plate 12 which are correspondingly arranged on the cushion block 1, the left pressing plate 11 is located between the left impact die 2 and the right pressing plate 12, the left impact die 2 is used for contacting an incident rod of the Hopkinson bar, a right impact die 4 which is used for contacting a transmission rod of the Hopkinson bar is arranged between the left pressing plate 11 and the right pressing plate 12, and a plate 6 is placed between the left pressing plate 11 and the right impact die 4.

[0026] It should be noted that under dynamic load, the mechanical properties of materials are significantly related to the strain rate. The strain rate effect of the mechanical properties of materials caused by high amplitude short duration pulse load is very important for the structural design and analysis of anti-dynamic load. The Hopkinson bar device can be used for testing the dynamic performance of materials, and is a commonly used device for detecting the stress-strain relationship of materials under high-speed impact load.

[0027] In the aerospace and automotive industries, difficult-to-deform materials are widely welcomed and applied due to their excellent performance, including making the whole lighter, good structural strength and stiffness, high specific strength, etc. Under the traditional low strain rate quasi-static forming method, the forming effect of difficult-to-deform materials is poor, so many high strain rate forming methods are derived, including high-speed forming and flexible forming, including explosive forming, electro-hydraulic forming, electromagnetic forming, particle forming and hydraulic forming. Most of these materials are processed in the form of plates, and rapid forming processing under high strain rate is carried out.

[0028] Metal plate materials are widely used and in great demand. Not only the impact forming of existing lightweight difficult-to-deform alloy plates needs to be studied, but also the impact forming of metal composite plates, stainless steel honeycomb plates and other plate materials needs to be studied.

[0029] Especially, the currently used die device has unsatisfactory use effect in the impact forming experiment of difficult-to-deform plate materials under high strain rate.

[0030] The study of the forming performance and rules of plate materials under impact load needs the help of experimental equipment. The previous die device has the problem of unsatisfactory use effect in the impact forming experiment of difficult-to-deform plate materials under high strain rate.

[0031] In the embodiment, during use, the stamping die part is placed on the cushion block 1, the left impact die 2 is in contact with the incident bar of the Hopkinson bar, the right impact die 4 is in contact with the transmission bar of the Hopkinson bar, the adjusting device is coaxial with the two bars, the distance between the two bars is adjusted and clamped, and finally the Hopkinson bar impact parameters are adjusted and the impact is performed.

[0032] In the further preferred embodiment of the present application, the left impact die 2 is provided with a pressing ring 3 in contact with the left pressing plate 11 on one side of the left pressing plate 11, a plurality of guide columns are fixedly installed on the side of the pressing ring 3 away from the left pressing plate 11, and guide holes are formed in the left impact die 2 for the plurality of guide columns to be inserted.

[0033] In the embodiment, during impact use, the guide columns on the pressing ring 3 slide in the guide holes on the left impact die 2 to achieve guided sliding.

[0034] In the further preferred embodiment of the present application, a spring 5 is arranged in each of the guide holes, and the two ends of the spring 5 are in contact with the inner wall of the guide hole and the end of the guide column, respectively.

[0035] In the embodiment, the spring 5 is in an uncompressed state when not stamping, the pressing ring 3 is in contact with the left pressing plate 11 on the right side, the compression amount of the spring 5 increases as the left side is impacted, the left impact die 2 moves to the right, the punch die 7 impacts the plate material 6, the plate material 6 is formed in the recess die 8, and the spring 5 ensures that the impact depth is not too large.

[0036] In the further preferred embodiment of the present application, the plurality of guide columns are hollow, a plurality of assembly blind holes are formed in the side of the left impact die 2 away from the left pressing plate 11, the plurality of assembly blind holes are arranged in communication with the plurality of guide holes, respectively, a connecting bolt 9 is arranged in each of the plurality of guide columns and extends into the assembly blind hole through the corresponding guide hole and the spring 5, and a nut 10 is threadedly installed at one end of the connecting bolt 9 in the assembly blind hole.

[0037] In the embodiment, the connecting bolt 9 and the nut 10 limit and connect the pressing ring 3 and the left impact die 2, the spring 5 is locked into the guide hole, it is ensured that the spring 5 will not pop out during use, and the nut 10 can be adjusted to adjust the length of the connecting bolt 9 so that the elastic force is adjusted.

[0038] In the further preferred embodiment of the present application, a replaceable punch die 7 is installed at the center of the cylinder of the left impact die 2, and a replaceable recess die 8 is installed at the center of the cylinder of the right impact die 4, and the replaceable punch die 7 and the replaceable recess die 8 are arranged correspondingly for impact test of the plate material 6.

[0039] In the embodiment, the replaceable punch die 7 and the replaceable recess die 8 can perform impact test on the plate material 6, and the replaceable mode can be replaced as needed, which is flexible to use. In the embodiment, the replaceable punch die 7 and the replaceable recess die 8 can perform impact test on the plate material 6, and the replaceable mode can be replaced as needed, which is flexible to use.

[0040] In the further preferred embodiment of the present application, grooves for placing the right impact die 4 and the sheet metal 6 are formed on the left pressing plate 11 and the right pressing plate 12, the sheet metal 6 is pressed between the left pressing plate 11 and the right impact die 4, and the left pressing plate 11, the right pressing plate 12 and the right impact die 4 are locked by the die bolt 13.

[0041] In the present embodiment, grooves for placing the right impact die 4 and the sheet metal 6 are formed on the left pressing plate 11 and the right pressing plate 12, which can directly assemble the right impact die 4 and the sheet metal 6 in use, and are connected by the die bolt 13, so that the installation is simple and the assembly is convenient.

[0042] In the further preferred embodiment of the present application, an arc-shaped half cavity with the same diameter as the left impact die 2 is formed on the cushion block 1, the two sides of the arc-shaped half cavity are arranged in a stepped manner, the left impact die 2 is located above the step of the arc-shaped half cavity, and the left pressing plate 11, the right pressing plate 12 and the right impact die 4 are all located below the step of the arc-shaped half cavity.

[0043] In the present embodiment, the arc-shaped inner cavity of the cushion block 1 is arranged in a stepped manner, which can install the left impact die 2 and the left pressing plate 11, the right pressing plate 12 and the right impact die 4 respectively, and meet the needs of sliding and fixing of different workpieces.

[0044] In the further preferred embodiment of the present application, the left impact die 2 and the right pressing plate 12 are respectively provided with through holes for the Hopkinson bar to pass through and contact the replacement convex die 7 and the replacement concave die 8.

[0045] In the present embodiment, the through holes can be penetrated by the Hopkinson bar used, which is convenient for impact.

[0046] In the further preferred embodiment of the present application, the replacement convex die 7 and the left impact die 2, and the replacement concave die 8 and the right impact die 4 are all in transition fit.

[0047] In the present embodiment, the replacement convex die 7 and the left impact die 2, and the replacement concave die 8 and the right impact die 4 are in transition fit, which ensures normal use in use.

[0048] In the further preferred embodiment of the present application, the sheet metal 6 is disc-shaped and has a thickness less than 2 mm, and the materials of the left impact die 2 and the right impact die 4 are both die steel.

[0049] In the present embodiment, the disc-shaped sheet metal 6 is uniformly stressed when impacted.

[0050] In summary, the present die can be used with the existing Hopkinson bar, and can perform impact forming experiments on difficult-to-deform sheet materials under high strain rate.

[0051] Compared with the related art, the mold can be used with the existing Hopkinson bar, can perform impact forming experiment on difficult-to-deform plate materials under high strain rate, has good stability in use, is simple to assemble, and is more convenient to use.

[0052] In several embodiments provided by the present application, it should be understood that the disclosed apparatus can be implemented in other manners. For example, the division of the apparatus embodiments is merely illustrative, and the division of the units can be changed according to actual conditions, such as combination or integration of multiple units, or deletion of some units, or addition of some features to other units, etc. In addition, the coupling or communication connection between the units can be indirect coupling or communication connection through some interfaces, or direct coupling or communication connection between the units, which can be implemented in electric, mechanical or other forms.

[0053] The above embodiments are merely used to illustrate the technical solutions of the present application, rather than limit the protection scope of the present application. Obviously, the described embodiments are only some, but not all of the embodiments of the present application. Based on these embodiments, all other embodiments obtained by those of ordinary skill in the art without creative work shall fall within the protection scope of the present application. Although the present application has been described in detail with reference to the above embodiments, those of ordinary skill in the art can still make some modifications to the technical solutions described in the above embodiments without departing from the spirit of the present application. Therefore, the modifications should also be considered as falling within the protection scope of the present application.

Claims

1. A mold apparatus for experimental research on the impact forming of horizontal plate-type specimens on a Hopkinson bar, characterized in that, include: Support section and impact die section; The support portion includes a pad for placing the impact mold portion. The impact mold portion includes a left impact mold, a left pressure plate, and a right pressure plate correspondingly disposed on the pad. The left pressure plate is located between the left impact mold and the right pressure plate. The left impact mold is used to contact the incident rod of the Hopkinson rod. A right impact mold is disposed between the left pressure plate and the right pressure plate to contact the transmission rod of the Hopkinson rod. The space between the left pressure plate and the right impact mold is used to place the sheet material. The left impact die is provided with a pressure ring on one side of the left pressure plate, which is in contact with the left pressure plate. Multiple guide posts are fixedly installed on the side of the pressure ring away from the left pressure plate. The left impact die is provided with guide holes for the insertion of multiple guide posts. Each of the multiple guide holes is equipped with a spring, and the two ends of the spring are in contact with the inner wall of the guide hole and the end of the guide post, respectively. The guide posts are hollow, and the left impact mold has multiple blind holes on the side away from the left pressure plate. The multiple blind holes are connected to multiple guide holes. Each of the guide posts has a connecting bolt that passes through the corresponding guide hole and spring and extends into the blind hole. A nut is threaded on one end of the connecting bolt located in the blind hole. A replaceable punch is installed at the cylindrical center of the left impact die, and a replaceable die is installed at the cylindrical center of the right impact die. The replaceable punch and replaceable die are respectively set for impact testing of the test plate.

2. The mold apparatus for impact forming experiments of horizontal plate-type specimens on a Hopkinson bar as described in claim 1, characterized in that, The left and right pressure plates are provided with grooves for placing the right impact die and the sheet metal. The sheet metal is pressed between the left pressure plate and the right impact die. The left pressure plate, the right pressure plate and the right impact die are locked together by mold closing bolts.

3. The mold apparatus for impact forming experiments of horizontal plate-type specimens on a Hopkinson bar as described in claim 1, characterized in that, The pad has an arc-shaped semi-cavity with the same diameter as the left impact mold. The two sides of the arc-shaped semi-cavity are stepped. The left impact mold is located above the steps of the arc-shaped semi-cavity, and the left pressure plate, right pressure plate and right impact mold are all located below the steps of the arc-shaped semi-cavity.

4. The mold apparatus for impact forming experiments of horizontal plate-type specimens on a Hopkinson bar as described in claim 1, characterized in that, The left impact die and the right pressure plate are respectively provided with openings for the Hopkinson rod to pass through and contact the replacement punch and the replacement die.

5. The mold apparatus for impact forming experiments of horizontal plate-type specimens on a Hopkinson bar as described in claim 1, characterized in that, The replacement of the punch and the left impact die, and the replacement of the die and the right impact die, are all transition fits.

6. The mold apparatus for impact forming experiments of horizontal plate-type specimens on a Hopkinson bar as described in claim 1, characterized in that, The sheet metal is disc-shaped and less than 2mm thick, and both the left and right impact dies are made of mold steel.

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