CN203405318U - Test system for manufacturing specified-dimension impact pit on metal sheet - Google Patents

Abstract

A test system for manufacturing a specified-dimension impact pit on a metal sheet is composed of a base, a test piece, a pressing plate, an impact block, a circular-hole pad, a rubber gasket and a bracket, wherein the bracket vertically stands on the base and is fixedly connected with the base through reinforcing ribs, the circular-hole pad is disposed in a rectangular groove of the base, the test piece, the rubber gasket and the pressing plate are placed on the circular-hole pad in sequence, and the impact block is hung in a central position of the bracket. The test system provided by the utility model can be used for impacting a metal sheet, can be used for manufacturing a specified-dimension pit and ensuring that the surface of the impacted metal sheet is smooth and has no scratch, and can be used for experiment-simulating a pit caused by low-speed impact such as tool drop or bird strike in the actual using process of a real metal sheet structure such as an aircraft skin and lays a foundation for further evaluation of the influence of pits to safety of metal sheets.

Description

A kind of pilot system of manufacturing sheet metal given size impact dent

Technical field

The utility model provides a kind of pilot system of manufacturing sheet metal given size impact dent, belongs to experimental test technical field.

Background technology

Object acts in structure and just produces and impact with certain speed within very short time, and causes shock load, and the stress that shock load produces is called shock stress, the material and the structural damage that because of impact, cause can be found everywhere, such as, aircraft in flight course because of hail, bird hit or in maintenance process casual instrument drop all can be on structural member or covering, produce impact injury to a certain degree, it is characterized in that leaving impact dent at structural member or skin-surface, can say, the size of impact dent has represented the size of impact injury and impact energy in a sense, therefore, be necessary to manufacture the impact dent of given size in material or structure, for studying its impact on static strength and fatigue strength performance, set up the relation of dimple size and static strength and fatigue strength, formulate rational maintenance policy.At present, composite-material laminates impulse test technology is more ripe with device development, and formed impulse test standard, but, to utilizing the experimental technique of the pit that impacts manufacture sheet metal given size still immature with device, rarely have the report of technical research in this respect both at home and abroad, for this reason, the utility model has been developed a kind of pilot system of manufacturing the impact dent of sheet metal given size, manufactures specially the pit of sheet metal given size, for the formulation of maintenance policy provides technical support.

Utility model content

The purpose of this utility model is to provide a kind of pilot system of manufacturing sheet metal given size impact dent, for manufacturing the impact dent of sheet metal given size.

The technical scheme that the utility model adopts is as follows:

1) a kind of pilot system of manufacturing sheet metal given size impact dent of the utility model, it is comprised of base, testpieces, pressing plate, impact block, circular hole cushion block, rubber sheet gasket and support, and the position annexation between them is: support vertical stands on base and is connected with reinforcement and base; Circular hole cushion block is placed in base rectangular recess, places successively testpieces, rubber sheet gasket and pressing plate on it, and impact block hangs on mid-stent position.

Described base is hardware, and it is formed by connecting by a rectangular steel plates and 4 angle steel supporting legs; Rectangular steel plates middle part is provided with the rectangular recess of placing circular hole cushion block, and rectangular recess middle part is provided with a circular hole.

Described testpieces is a rectangular steel plates, and its middle part is provided with a circular hole (such as 20 millimeters of diameters), uniform four circular holes of plate surrounding;

Described pressing plate is the rectangular steel plates of two long sideband bent side recesses;

Described impact block is cylindrical member with the level; Its one end is double-screw bolt, and the other end is hemispherical.

Described circular hole cushion block is the rectangle plate of surrounding band circular arc, center band circular hole;

Described rubber sheet gasket is the rectangular rubber plate of the uniform circular hole of surrounding, center band circular hole;

Described support is made by section bar

font framework, its bottom is connected with reinforcement and base.

The principle of this pilot system and operating mode brief introduction are as follows:

In engineering, the size of sheet metal impact dent is normally defined the ratio of pit root diameter (RD) and the degree of depth, therefore, this pilot system is by the mode of selected base cushion block Circularhole diameter and adjustment impact block height, manufacture the pit of regulation root diameter (RD) and the degree of depth, thereby obtain the impact dent of given size (stipulating the ratio of pit root diameter (RD) and the degree of depth).

Because sheet metal is because impact produces plastic yield along base cushion block circular hole, form pit, that is to say, Circularhole diameter determines pit root diameter (RD) size, Circularhole diameter is too large, can produce size effect, causes pit root not identical along the diameter of testpieces length and Width.Generally, need to determine the base cushion block Circularhole diameter that does not produce size effect according to sheet metal testpieces size, be Circularhole diameter should be not more than sheet metal testpieces width 1/4, like this, the pit root of manufacturing is identical along the diameter of testpieces length and Width, thereby, can manufacture the pit of regulation root diameter (RD).

Adjust the height of impact block, and the smooth guide on support glides, impact pressing plate and be fixed on the testpieces on base, final, can manufacture the impact dent of sheet metal testpieces prescribed depth.

This pilot system only limits to the low-velocity impact damage test simulation (being the manufacture of spheroidal pit) of sheet metal, is not useable for the low-velocity impact damage simulation of metal material or Thick Composite.

2) manufacture a method of testing for sheet metal given size impact dent pilot system, the method concrete steps are as follows:

Step 1, designs and manufactures impact head, support, the base of impact block, different size, the parts such as circular hole cushion block, rubber sheet gasket and pressing plate of base, and these Assembly of the parts are in aggregates, forms pilot system.

Step 2, base is laid to the middle position (being that impact head is aimed at centre hole of base hole) of pilot system, circular hole cushion block is installed, and lay is with the rubber sheet gasket of mark test part placement location mark, guarantee that sample center accurately aims at base center, and prevent that sample from causing galled spots because of shock-produced deformation; Again sheet metal is placed in the testpieces mark line of rubber sheet gasket; Finally, with steel pressing plate, fix, after guaranty money's metal thin plate impacts, the remainder of (except impact dent) does not subside, and still keeps smooth.

Step 3, lifts to predetermined altitude by impact block and discharges, and impact block, by the guide rail free-falling along vertical, impacts sheet metal sample.In experimentation, guarantee not occur secondary pulse, after occurring to impact for the 1st time, adopt both hands to hold impact block, prevent secondary pulse.

Step 4, takes off the sheet metal after impact, utilizes vernier caliper and steel ruler to measure and perform record to pit depth and pit diameter.Pit depth is defined as from pit minimum point to the distance between thin plate surface level, and steel ruler is horizontal on pit, and the distance with vernier caliper measurement steel ruler upper surface to pit minimum point, deducts steel ruler thickness by reading and be pit depth; Pit diameter is defined as the diameter that the circular vestige of spheroidal bulge root is impacted at sheet metal back, adopts vernier caliper can measure this diameter.

Step 5, according to the measurement result of dimple size, adjusts the shock height of impact block, and repetitive shock test and dimple size measuring process, until obtain the impact dent of given size.

Advantage and effect: the pilot system that the utility model provides can be for impacting sheet metal, can manufacture the pit of given size, can guarantee again metal sake surface (except pit) after impacting smooth, without abrading, can be used for test simulation real metal thin-slab construction (as aircraft skin) in actual use because of the pit that instrument drops or the low velocity impact such as bird strike causes, for further assessment pit lays the foundation to sheet metal safety effects.

Accompanying drawing explanation

Below in conjunction with accompanying drawing and example, the utility model is further illustrated.

Fig. 1 pilot system one-piece construction figure.

In Fig. 1: 1. base, 2. testpieces, 3. pressing plate, 4. impact block, 5. support.

Fig. 2 impact head structural drawing.

Fig. 3 understructure figure.

Fig. 4 circular hole cushion block structure figure.

Fig. 5 rubber sheet gasket structural drawing.

Fig. 6 impulse test part figure.

Fig. 7 pressure plate structure figure.

Fig. 8 base schematic diagram.

In Fig. 8: 1. base, 6. circular hole cushion block, 7. rubber sheet gasket, 2. testpieces, 3. pressing plate.

Embodiment

In conjunction with Fig. 1 and Fig. 8, embodiment of the present utility model is described.

In Fig. 1, a kind of pilot system of manufacturing sheet metal given size impact dent of the utility model, it is comprised of base 1, testpieces 2, pressing plate 3, impact block 4, circular hole cushion block 6, rubber sheet gasket 7 and support 5, and the position annexation between them is: support 5 vertically stands on base 1 and is connected with reinforcement and base 1; Circular hole cushion block 6 is placed in base 1 rectangular recess, places successively testpieces 2,7 of rubber blankets and pressing plate 3 on it, and impact block 4 hangs on support 5 medium positions.

Principle of work is as follows: impact block 4 glides along the smooth guide on support 5, impacts pressing plate and is fixed on the testpieces 2 on base 1 for 3 times, realizes the object of testpieces being manufactured to the impact dent of given size.

Fig. 8 has described the detailed structure of pilot system base.Remainder after this base 1 can guaranty money's metal thin plate impacts except pit still keeps showing smooth, and does not produce scratch, only produces the pit of a spherical shape.The cushion block of circular hole cushion block 6 shown in Fig. 4 for containing center hole, surrounding chamfering.A square opening is contained in base 1 central authorities shown in Fig. 3, and its size and circular hole cushion block 6 are measure-alike, and circular hole cushion block 6 can be put into base 1 square opening like this, can make sheet metal only in circular hole cushion block 6 center hole regions, produce spheroidal distortion when being subject to impacting.The rubber sheet gasket 7 with testpieces 2 position marks shown in Fig. 5 is laid on base 1, its circular hole size is identical with the circular hole of circular hole cushion block 6, in lay process, rubber sheet gasket 7 circular holes are aimed to the circular hole of base 1 and circular hole cushion block 6, can be guaranteed that center of circular hole and impact head are coaxial; Rubber sheet gasket 7 effects are to prevent from impacting rear sheet metal back surfaces not because impact produces scratch.Testpieces shown in Fig. 62 is placed in the boxed area of marker location of rubber sheet gaskets, with impact head shown in warranty test part 2 centers and base 1 and Fig. 2 on same axis.Pressing plate 3 shown in Fig. 7 is for fixing sample, and pressing plate 3 surroundings are bolted on base 1, and guaranty money's metal thin plate still keeps smooth (except pit portion) after impacting, and does not subside.

In addition, in the pit manufacture test of sheet metal, sheet metal testpieces 2(is as shown in Figure 6) design very crucial, must there is enough width in warranty test part middle part, if middle part is too narrow, cannot obtain the impact dent of ideal form and given size.

2) manufacture a method of testing for sheet metal given size impact dent pilot system, the method concrete steps are as follows:

Step 1, designs and manufactures impact head, support 5, the base 1 of impact block 4, different size, the parts such as circular hole cushion block 6, rubber sheet gasket 7 and pressing plate 3 of base, and these Assembly of the parts are in aggregates, forms pilot system.

Step 2, base 1 is laid to the middle position (being that impact head is aimed at centre hole of base hole) of pilot system, circular hole cushion block 6 is installed, and lay is with the rubber sheet gasket 7 of mark test part placement location mark, guarantee that sample center accurately aims at base 1 center, and prevent that sample from causing galled spots because of shock-produced deformation; Again sheet metal is placed in testpieces 2 mark lines of rubber sheet gasket 7; Finally, fixing with steel pressing plate 3, after guaranty money's metal thin plate impacts, the remainder of (except impact dent) does not subside, and still keeps smooth.

Step 3, lifts to predetermined altitude by impact block 4 and discharges, and impact block 4, by the guide rail free-falling along vertical, impacts sheet metal sample.In experimentation, guarantee not occur secondary pulse, after occurring to impact for the 1st time, adopt both hands to hold impact block 4, prevent secondary pulse.

Step 4, takes off the sheet metal testpieces 2 after impact, utilizes vernier caliper and steel ruler to measure and perform record to pit depth and pit diameter.Pit depth is defined as from pit minimum point to the distance between thin plate surface level, and steel ruler is horizontal on pit, and the distance with vernier caliper measurement steel ruler upper surface to pit minimum point, deducts steel ruler thickness by reading and be pit depth; Pit diameter is defined as the diameter that the circular vestige of spheroidal bulge root is impacted at sheet metal back, adopts vernier caliper can measure this diameter.

Step 5, according to the measurement result of dimple size, adjusts the shock height of impact block 4, and repetitive shock test and dimple size measuring process, until obtain the impact dent of given size.

By above-mentioned five steps, by adjusting the mode of base circular hole cushion block 6 Circularhole diameters and impact block 4 height, manufacture the impact dent of regulation root diameter (RD) and the degree of depth, thereby obtain the impact dent of given size (stipulating the ratio of pit root diameter (RD) and the degree of depth)

Claims (1)

1. a pilot system of manufacturing sheet metal given size impact dent, it is characterized in that: it is comprised of base, testpieces, pressing plate, impact block, circular hole cushion block, rubber sheet gasket and support, support vertical stands on base and is connected with reinforcement and base; Circular hole cushion block is placed in base rectangular recess, places successively testpieces, rubber sheet gasket and pressing plate on it, and impact block hangs on mid-stent position;

Described base is hardware, and it is formed by connecting by a rectangular steel plates and 4 angle steel supporting legs; Rectangular steel plates middle part is provided with the rectangular recess of placing circular hole cushion block, and rectangular recess middle part is provided with a circular hole;

Described testpieces is a rectangular steel plates, and its middle part is provided with a circular hole, uniform four circular holes of plate surrounding;

Described pressing plate is the rectangular steel plates of two long sideband bent side recesses;

Described impact block is cylindrical member with the level; Its one end is double-screw bolt, and the other end is hemispherical;

Described circular hole cushion block is the rectangle plate of surrounding band circular arc, center band circular hole;

Described rubber sheet gasket is the rectangular rubber plate of the uniform circular hole of surrounding, center band circular hole;

Described support is made by section bar

font framework, its bottom is connected with reinforcement and base.

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