An intergranular corrosion specimen bending device

Abstract

A bending device for intergranular corrosion samples relates to the field of physical sample preparation and sampling technology for stainless steel intergranular corrosion samples. It includes a bending mechanism with a stamping mechanism fixed to it. The bending mechanism is used for sample placement and positioning, while the stamping mechanism is used for 180-degree bending of the sample. This invention can achieve 180-degree bending sampling with a single pressure operation. During sampling, the stamping head of the stamping mechanism and the stamping groove of the bending mechanism cooperate to bend the sample into a V-shaped structure with an acute angle. The stamping head then positions the sample, and the inwardly moving inner push rods on the bending mechanism further reduce the angle of the sample until a 180-degree bending sampling is achieved. This operation method improves the efficiency of sample bending.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of physical sampling and sampling of intergranular corrosion samples of stainless steel, and particularly relates to a bending device for intergranular corrosion samples. BACKGROUND

[0002] GB / T4334.5-2000 requires that, when the sample obtained in the sulfuric acid-copper sulfate corrosion test of stainless steel is sampled, the sample of a machined part, a welded pipe and a welded joint is folded at 180 degrees, wherein the boat-shaped sample of the welded pipe is bent at 180 degrees along the direction perpendicular to the weld, and the welded joint is bent at 180 degrees along the fusion line. When the thickness of the sample is not greater than 1 mm, the diameter of the pressure head is 1 mm; when the thickness of the sample is greater than 1 mm, the diameter of the pressure head is 5 mm. The standard also requires that the size of the sample before the corrosion test is 80 mm to 100 mm in length, 20 mm in width and 1 mm to 4 mm in thickness. The purpose of the 180-degree bending sampling in the standard is to determine whether there is a crack due to intergranular corrosion at the bent part of the obtained sample. If the crack cannot be evaluated or confirmed through the bent sample, the metallographic detection method can be used to determine whether there is intergranular corrosion.

[0003] However, when the sample is bent, the current method is to clamp one end of the sample with a table clamp and then bend it by knocking the corrosion surface. This method is easy to form damage on the detection surface during sampling, and causes migration and advancement of intergranular dislocations during hammering, which leads to the inability to determine whether there is intergranular corrosion at the bent part. In order to improve the accuracy of intergranular corrosion detection, multiple samples need to be subjected to corrosion detection, and the prominent feature of this corrosion detection is that the experiment time is 16 consecutive hours. If the above method is used for bending, it is easy to cause irreversible changes to the sample itself, thereby causing detection failure. At the same time, the sample processed by this method is not suitable for being used as a detection object again due to the changes in the internal crystal structure and intergranular structure.

[0004] There is also a method of clamping one end of the sample on a table clamp and clamping the other end with a movable clamp, and then bending it through the principle of a lever. This operation method has a limited range of bending angles. When the bending angle is acute, the sample is bent by pressing with the table clamp. This method is also laborious and has low bending efficiency.

[0005] There is also a sampling of conventional plate stamping equipment for bending sampling, which is relatively simple, including a hydraulic cylinder, a pressure head fixed on the hydraulic cylinder and a stamping die placed at the lower end of the pressure head. Since the conventional stamping forming rarely involves 180-degree bending, the sample can only be stamped into a V-shaped structure by the pressure head, and then needs to be folded by the corresponding table clamp. When folding, it needs to act on the corrosion surface, thereby causing scratches on the detection surface. In addition, the simple stamping equipment has an edge on the stamping die, which causes scratches on the corrosion surface of the sample. Moreover, the pressure head of the simple stamping equipment is located directly above the stamping die, and misoperation during sampling can easily cause safety accidents. SUMMARY

[0006] The present application provides an intergranular corrosion sample bending device to solve the above problems of the prior art, which has strong practicability.

[0007] In order to achieve the purpose of the present application, the following technology is adopted:

[0008] An intergranular corrosion sample bending device, comprising a bending mechanism, and a stamping mechanism fixed on the bending mechanism.

[0009] Further, the bending mechanism comprises a base, a pair of parallel guide rails are installed on the base by screws, a sliding sleeve is slidably arranged on the guide rails, a moving plate is installed on the sliding sleeve by screws, a window is formed in the moving plate, side plates are installed at both ends of the length direction of the moving plate by screws, a pad plate is installed at the upper end of the side plate by screws, a pair of L-shaped connecting arms are arranged on the pad plate, a stamping seat is installed at the upper end of the connecting arm by screws, two pairs of guide rods are arranged on the stamping seat, the guide rods are arranged vertically, fixed end plates are fixed at the upper and lower ends of the guide rods at the same end by screws, and the fixed end plate at the lower end is installed on the stamping seat by screws.

[0010] Further, a movable side plate is movably arranged on the guide rods at the same side, a pair of inclined pressing grooves are symmetrically formed in the movable side plate, the upper end of the inclined pressing groove is inwardly inclined, the upper end of the movable side plate is symmetrically and spaced apart to form a convex portion, an outer supporting vertical plate is formed at the upper end of the convex portion, the outer supporting vertical plate is flush with the inner end surface of the convex portion, an inclined wall is formed on the side wall of the outer supporting vertical plate, and the upper end of the inclined wall is inwardly inclined.

[0011] Further, the lifting movement between the convex parts is provided with a stamping cross arm, a rectangular hole is formed on the stamping cross arm, a lower end seat is installed on the outer wall of the movable side plate through screws, a pair of penetrating rods are connected to the lower end seat through threads, the upper ends of the penetrating rods are penetrated into the two ends of the stamping cross arm, the penetrating rods are vertically arranged, a second spring is sleeved on the penetrating rod, an L-shaped side push plate is movably arranged on the penetrating rod, the penetrating rod is penetrated into the horizontal section of the side push plate, the second spring is located between the horizontal section of the side push plate and the lower end seat, a moving hole is formed on the side push plate, the lower end seat is penetrated into the moving hole, a pair of inclined grooves are symmetrically formed on the lower end of the side push plate, the upper ends of the inclined grooves are inclined inward, and a pressing sleeve is movably arranged in the inclined grooves.

[0012] Further, two pairs of limiting screws are installed on the movable side plate through screws, a locking plate is movably arranged on each pair of limiting screws, a pair of horizontally arranged long holes are formed on the locking plate, the limiting screws are penetrated into the long holes, a U-shaped locking groove is formed on the outer side end of the locking plate, an outer extension shaft is connected to the inner side end of the locking plate through threads, and the pressing sleeve is rotatably arranged on the outer side end of the outer extension shaft.

[0013] Further, a stamping table is installed on the stamping seat through screws, wing plates are formed on both sides of the upper end of the stamping table, a V-shaped stamping groove is formed on the upper end of the stamping table in an open manner, the bottom of the stamping groove is in an arc structure, the two sides of the stamping groove are inclined stamping surfaces, the included angle between the stamping surfaces is an acute angle, a vertical surface is vertically arranged on the upper end of the stamping surface, an inclined guide surface is obliquely arranged on the upper end of the vertical surface, the upper end of the inclined guide surface is obliquely extended outward, an inner concave arc groove is formed on the inclined surface of the inclined guide surface, a roller is rotatably arranged in the inner concave arc groove, first rotation shafts are respectively formed on both ends of the roller, limiting side plates are arranged on both sides of the stamping seat, the first rotation shafts are rotatably arranged on the limiting side plates, limiting nuts are connected to the outer side ends of the first rotation shafts through threads, the limiting side plates are located at the two ends of the opening of the stamping groove, the limiting side plates are installed on the stamping seat through screws, a pair of horizontally arranged waist-shaped holes are symmetrically formed on the upper end of the limiting side plate, a pair of inner top rods are arranged between the limiting side plates, the axial direction of the inner top rods is perpendicular to the inner wall of the limiting side plate, second rotation shafts are respectively formed on both ends of the inner top rods, the second rotation shafts are movably arranged in the waist-shaped holes, limiting rings are fixed to the second rotation shafts through pins, the limiting rings are located on the outer side of the limiting side plate, rollers are connected to the outer side ends of the second rotation shafts through bearings, the rollers are penetrated into the inclined pressing groove, and the second rotation shafts are clamped into the locking groove.

[0014] Further, two pairs of vertical rods are arranged between the base plate and the moving plate, the vertical rods are arranged on the transverse section of the connecting arm, the upper end of the vertical rod is connected to the base plate by screwing, the lower end of the vertical rod is connected to the moving plate by screwing, the first spring is sleeved on the vertical rod, the lifting plate is sleeved on the vertical rod, the lower wall of the transverse section of the connecting arm abuts against the upper wall of the lifting plate or the transverse section of the connecting arm is fixed on the lifting plate by screwing, the first spring is located between the lifting plate and the moving plate, the lower wall of the lifting plate is provided with the downward rod by screwing, the downward rod is arranged in the window, the lower end of the downward rod is provided with the tapered hole, the diameter of the upper end of the tapered hole is smaller than that of the lower end, the fixed seat is arranged on the base plate by screwing, the positioning column is connected to the geometric center of the fixed seat by screwing, the upper end of the positioning column is formed with the conical head, the diameter of the upper end of the outer periphery of the conical head is smaller than that of the lower end, and the outer shape of the conical head matches the outer shape of the tapered hole.

[0015] Further, the stamping mechanism comprises a plurality of guide vertical rods mounted on the base by screwing, the upper end of the guide vertical rod is provided with a top plate by screwing, the top plate is provided with a hydraulic cylinder by bolting, the movable end of the hydraulic cylinder is fixed with a stamping plate by a nut, the two ends of the stamping plate are respectively fixed with a pair of ball sleeves by screwing, the ball sleeves are sleeved on the guide vertical rods, the lower wall of the stamping plate is provided with a fixed lower plate by screwing, the fixed lower plate is provided with a pair of push arms, the lower end of the push arm is welded with a rectangular frame, the lower end of the rectangular frame is welded with a pressing plate, the rod is arranged in the two ends of the pressing plate, the vertical block is movably arranged in the rectangular hole, the lower end of the vertical block is fixed with a stamping head by screwing, the lower end of the stamping head is arc-shaped, the upper end of the vertical block is connected with a pair of vertical guide rods by screwing, the upper end of the vertical guide rod is arranged in the fixed lower plate and the stamping plate, the third spring is sleeved on the vertical guide rod, the lower end of the third spring abuts against the upper end face of the vertical block, and the upper end of the third spring abuts against the lower wall of the fixed lower plate.

[0016] Further, the two ends of the pressing plate are respectively provided with side vertical plates by screwing, a horizontal guide rod is fixed between each pair of side vertical plates at the same end by screwing, a pair of fourth springs and an inner push arm are sleeved on the horizontal guide rod, the inner push arm is L-shaped, the fourth spring is located between the inner push arm and the side vertical plate, an opening and closing plate is welded between the inner push arms at the same side, a plurality of locking rods are fixed on the opening and closing plate by screwing, the locking rods are arranged on both sides of the rectangular frame, a plurality of insertion holes are arranged on both sides of the upper end of the vertical block, the inner side end of the locking rod is arranged in the insertion hole, L-shaped supporting arms are welded on both end outer walls of the opening and closing plate, the lower end of the vertical section of the supporting arm is rotatably provided with a supporting wheel through a third shaft, a groove is arranged on the supporting arm, and the supporting wheel is located in the groove. The supporting wheel rolls on the inclined wall and the outer wall of the outer supporting vertical plate, and the outer supporting vertical plate is arranged in the groove of the supporting arm.

[0017] The above technical solution has the following advantages:

[0018] The present application can realize 180-degree bending sampling through one pressing operation, and when sampling, the sample is bent into a V-shaped structure with an acute angle through the cooperation of the punch head and the punch groove, then the sample is positioned by the punch head, and the included angle of the sample is further reduced by the inwardly close inner top rods until the 180-degree bending sampling is achieved, and the efficiency of sample bending is improved through this operation mode.

[0019] The present application avoids scratching the corrosion surface of the sample by the edges of the stamping table through the structural design of the stamping table and the design of the roller, and further sets the lower end of the punch groove into an arc structure, preferably an arc structure, to avoid the deformation of the bending part itself when the detection surface directly abuts the bending part, which affects the observation of the crack.

[0020] The present application also improves the safety during sampling, and when the sample is placed, the stamping table and other components are not directly below the punch head, so that safety accidents caused by misoperation can be avoided, and in addition, during the stamping operation, in order to enable the bending line of the sample to be located directly below the punch head and facilitate the installation of the guide component, a position automatic calibration component is also provided. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application will be further described in detail below with reference to the drawings.

[0022] Figure 1 A perspective view of the intergranular corrosion sample bending device is shown.

[0023] Figure 2 A perspective view of the bending mechanism from two different angles is shown.

[0024] Figure 3 A perspective view of the connection between the lower extension rod and the positioning column is shown.

[0025] Figure 4 A perspective view of the lower extension rod is shown.

[0026] Figure 5 A perspective view of the positioning column is shown.

[0027] Figure 6 A first part structure detail view of the bending mechanism is shown.

[0028] Figure 7 A second part structure detail view of the bending mechanism from different angles is shown.

[0029] Figure 8 A perspective view of the stamping mechanism is shown.

[0030] BRIEF DESCRIPTION OF DRAWINGS:

[0031] bending mechanism 1, stamping mechanism 2, base 100, guide rail 101, sliding sleeve 102, moving plate 103, side plate 104, pad plate 105, vertical rod 106, first spring 107, lifting plate 108, connecting arm 109, downward rod 110, window 111, stamping seat 112, fixed seat 113, fixed end plate 114, guide rod 115, movable side plate 116, convex part 117, outer support vertical plate 118, inclined wall 119, stamping cross arm 120, rectangular hole 121, inclined pressing groove 122, side pushing plate 123, moving hole 124, inclined groove 125, lower end seat 126, second spring 127, rod 128, limiting side plate 129, waist-shaped hole 130, stamping table 131, positioning column 132, conical head 133, conical hole 134, limiting screw 135, lock plate 136, long hole 137, locking groove 138, inner top rod 139, second rotating shaft 140, limiting ring 141, roller 142, outer extension shaft 143, pressing sleeve 144, wing plate 145, stamping groove 146, vertical surface 147, inclined guide surface 148, roller 149, first rotating shaft 150, guide vertical rod 200, top plate 201, hydraulic cylinder 202, stamping plate 203, fixed lower plate 204, downward pushing arm 205, rectangular frame 206, pressing plate 207, vertical guide rod 208, third spring 209, vertical block 210, stamping head 211, side vertical plate 212, horizontal guide rod 213, fourth spring 214, inner pushing arm 215, opening and closing plate 216, locking rod 217, opening arm 218, third shaft 219, opening wheel 220. DETAILED DESCRIPTION

[0032] As shown in Figure 1 An intergranular corrosion sample bending device, comprising a bending mechanism 1, and a stamping mechanism 2 fixed on the bending mechanism 1.

[0033] As shown in Figures 2 to 7 The bending mechanism 1 comprises a base 100, a pair of parallel guide rails 101 installed on the base 100 by screws, a sliding sleeve 102 slidingly arranged on the guide rails 101, a moving plate 103 installed on the sliding sleeve 102 by screws, a window 111 formed in the moving plate 103, side plates 104 installed at both ends of the moving plate 103 in length direction by screws, a pad plate 105 installed at the upper end of the side plates 104 by screws, a pair of L-shaped connecting arms 109 penetrating through the pad plate 105, a stamping seat 112 installed at the upper end of the connecting arms 109 by screws, two pairs of guide rods 115 arranged on the stamping seat 112, the guide rods 115 arranged vertically, fixed end plates 114 fixed at the upper and lower ends of the guide rods 115 at the same end by screws, and the fixed end plate 114 at the lower end installed on the stamping seat 112 by screws.

[0034] As shown in Figures 2 to 5As shown, two pairs of vertical rods 106 are arranged between the base plate 105 and the moving plate 103, the vertical rods 106 are arranged on the transverse segments of the connecting arms 109, the upper ends of the vertical rods 106 are threadedly connected to the base plate 105, the lower ends of the vertical rods 106 are threadedly connected to the moving plate 103, the first springs 107 are sleeved on the vertical rods 106, the lifting plates 108 are sleeved on the vertical rods 106, the lower walls of the transverse segments of the connecting arms 109 abut against the upper walls of the lifting plates 108 or the transverse segments of the connecting arms 109 are fixed on the lifting plates 108 through screws, the first springs 107 are located between the lifting plates 108 and the moving plate 103, the lower walls of the lifting plates 108 are provided with the downward rods 110 which are installed through screws, the downward rods 110 are arranged at the windows 111, the lower ends of the downward rods 110 are provided with the tapered holes 134, the diameters of the upper ends of the tapered holes 134 are smaller than the diameters of the lower ends of the tapered holes 134, the fixed seats 113 are installed on the base 100 through screws, the positioning columns 132 are threadedly connected to the geometric centers of the fixed seats 113, the conical heads 133 are formed on the upper ends of the positioning columns 132, the diameters of the upper ends of the outer circumferences of the conical heads 133 are smaller than the diameters of the lower ends of the outer circumferences of the conical heads 133, and the outer shape structures of the conical heads 133 match the outer shape structures of the tapered holes 134.

[0035] As shown in Figure 2 and Figure 6 The movable side plates 116 are movably arranged on the guide rods 115 on the same side, a pair of inclined pressing grooves 122 are symmetrically arranged on the movable side plates 116, the upper ends of the inclined pressing grooves 122 are inwardly inclined, the upper ends of the movable side plates 116 are symmetrically and spaced apart to form the convex portions 117, the upper ends of the convex portions 117 are formed with the outward supporting vertical plates 118, the outward supporting vertical plates 118 are flush with the inner end faces of the convex portions 117, the side walls of the outward supporting vertical plates 118 are formed with the inclined walls 119, and the upper ends of the inclined walls 119 are inwardly inclined.

[0036] As shown in Figure 2 and Figure 6As shown, the convex part 117 is movably provided with a stamping cross arm 120, the stamping cross arm 120 is provided with a rectangular hole 121, the outer wall of the movable side plate 116 is provided with a lower end seat 126 through screwing, the lower end seat 126 is threadedly connected with a pair of penetrating rods 128, the upper end of the penetrating rod 128 is penetrated into the two ends of the stamping cross arm 120, the penetrating rod 128 is vertically arranged, the second spring 127 is sleeved on the penetrating rod 128, the L-shaped side push plate 123 is movably arranged on the penetrating rod 128, the penetrating rod 128 is penetrated into the horizontal section of the side push plate 123, the second spring 127 is located between the horizontal section of the side push plate 123 and the lower end seat 126, the side push plate 123 is provided with a moving hole 124, the lower end seat 126 is penetrated into the moving hole 124, the lower end of the side push plate 123 is symmetrically provided with a pair of inclined grooves 125, the upper end of the inclined groove 125 is inwardly inclined, and the pressure sleeve 144 is movably arranged in the inclined groove 125. The movable side plate 116 is provided with two pairs of limiting screws 135 through screwing, each pair of limiting screws 135 is movably provided with a lock plate 136, the lock plate 136 is provided with a pair of horizontally arranged long holes 137, the limiting screw 135 is penetrated into the long hole 137, the outer side end of the lock plate 136 is provided with a U-shaped locking groove 138, the inner side end of the lock plate 136 is threadedly connected with an outward extending shaft 143, and the pressure sleeve 144 is rotatably arranged at the outer side end of the outward extending shaft 143.

[0037] As Figure 2 , Figure 6 and Figure 7As shown, the punch seat 112 is provided with a punch table 131 mounted by screws, the upper end of the punch table 131 is provided with wing plates 145 on both sides, the upper end of the punch table 131 is open and formed with a V-shaped punch groove 146, the bottom of the punch groove 146 is arc-shaped, preferably, the arc-shaped structure of the punch groove 146 is a superior arc structure. The two sides of the punch groove 146 are inclined and provided with a punch surface, the included angle between the punch surfaces is an acute angle, the upper end of the punch surface is provided with a vertical surface 147, the upper end of the vertical surface 147 is inclined and provided with an inclined guide surface 148, the upper end of the inclined guide surface 148 extends outwardly, an arc-shaped concave groove is formed on the inclined surface of the inclined guide surface 148, a roller 149 is rotatably arranged in the arc-shaped concave groove, the two ends of the roller 149 are respectively formed with a first rotating shaft 150, the two sides of the punch seat 112 are provided with limiting side plates 129, the movable side plates 116 are located outside the limiting side plates 129, the first rotating shaft 150 is rotatably arranged on the limiting side plates 129, and the outer end of the first rotating shaft 150 is threadedly connected with a limiting nut, the limiting side plates 129 are located at both ends of the opening of the punch groove 146, the limiting side plates 129 are mounted on the punch seat 112 by screws, a pair of waist-shaped holes 130 are symmetrically formed in the upper end of the limiting side plates 129, a pair of inner top rods 139 are arranged between the limiting side plates 129, the axial direction of the inner top rods 139 is perpendicular to the inner wall of the limiting side plates 129, the two ends of the inner top rods 139 are respectively formed with second rotating shafts 140, the second rotating shafts 140 are movably arranged in the waist-shaped holes 130, the second rotating shafts 140 are fixed with limiting rings 141 by pins, the limiting rings 141 are located outside the limiting side plates 129, the outer end of the second rotating shafts 140 is connected with a roller 142 through a bearing, the roller 142 penetrates the inclined pressing groove 122, and the second rotating shafts 140 are clamped in the locking grooves 138.

[0038] As Figure 1 and Figure 8As shown, the stamping mechanism 2 comprises a plurality of guide vertical rods 200 mounted on the base 100 by screws, the upper ends of the guide vertical rods 200 are mounted with a top plate 201 by screws, the hydraulic cylinder 202 is mounted on the top plate 201 by bolts, the moving shaft of the hydraulic cylinder 202 coincides with the axial direction of the downward rod 110, the moving end of the hydraulic cylinder 202 is fixed with a stamping plate 203 by a nut, both ends of the stamping plate 203 are fixed with a pair of ball sleeves by screws, the ball sleeves are sleeved on the guide vertical rods 200, the lower wall of the stamping plate 203 is mounted with a fixed lower plate 204 by screws, the fixed lower plate 204 is mounted with a pair of push arms 205, the lower ends of the push arms 205 are welded with a rectangular frame 206, the lower ends of the rectangular frame 206 are welded with a pressing plate 207, the rod 128 is arranged at both ends of the pressing plate 207, the vertical block 210 is movably arranged in the rectangular hole 121, the lower end of the vertical block 210 is fixed with a stamping head 211 by screws, the lower end of the stamping head 211 is arc-shaped, the upper end of the vertical block 210 is connected with a pair of vertical guide rods 208 by threads, the upper ends of the vertical guide rods 208 are arranged in the fixed lower plate 204 and the stamping plate 203, the vertical guide rods 208 are sleeved with third springs 209, the lower ends of the third springs 209 abut against the upper end face of the vertical block 210, the upper ends of the third springs 209 abut against the lower wall of the fixed lower plate 204.

[0039] Both ends of the pressing plate 207 are mounted with side vertical plates 212 by screws, a horizontal guide rod 213 is fixed between each pair of side vertical plates 212 at the same end by threads, a pair of fourth springs 214 and inner push arms 215 are sleeved on the horizontal guide rod 213, the inner push arms 215 are L-shaped, the fourth springs 214 are located between the inner push arms 215 and the side vertical plates 212, opening and closing plates 216 are welded between the inner push arms 215 at the same side, a plurality of locking rods 217 are fixed on the opening and closing plates 216 by threads, the locking rods 217 are arranged at both sides of the rectangular frame 206, a plurality of insertion holes are arranged at both sides of the upper end of the vertical block 210, the inner side ends of the locking rods 217 are arranged in the insertion holes, L-shaped supporting arms 218 are welded at both end outer walls of the opening and closing plates 216, the vertical sections of the supporting arms 218 are rotatably provided with supporting wheels 220 through third shafts 219 at the lower ends, recesses are arranged on the supporting arms 218, the supporting wheels 220 are located in the recesses, and the supporting wheels 220 roll on the inclined walls 119 and the outer walls of the outer supporting vertical plates 118, and the outer supporting vertical plates 118 are arranged in the recesses of the supporting arms 218.

[0040] The stamping process of the embodiment comprises the following steps:

[0041] Step 01, if the punching table 131 is located directly below the punching head 211, then the punching table 131 needs to be moved to the end of the guide rail 101. It is to be noted that, because there are many names of movable components, the punching table 131 is taken as the moving object, and other components associated with it are moved synchronously.

[0042] Step 02, place the sample obtained by etching with the etched surface facing down on the upper wall of the wing plate 145, and the two ends of the sample abut on the outer periphery of the inner top rod 139 or detect the distance between the sample and the outer periphery of the inner top rod 139 by a gauge when placed, to ensure that the midline of the sample length direction and the axial direction of the arc segment of the punching groove 146 are located on the same vertical plane. This is particularly important for the bending of the weld intergranular corrosion sample, and for the weld intergranular corrosion sample, the length direction of the weld needs to be located on the same vertical plane as the axial direction of the arc segment of the punching groove 146 when placed.

[0043] Step 03, push the punching table 131 inward along the guide rail 101 to make the punching table 131 located directly below the punching head 211. During the movement of the punching table 131, the lower end surface of the lower extension rod 110 is always above the upper end surface of the conical head 133 under the support of the natural elongation of the first spring 107, until the lower extension rod 110 is moved above the conical head 133, and only the projection of the conical hole 134 of the lower extension rod 110 needs to be within the projection range of the conical head 133 during the movement.

[0044] Step 04, start the hydraulic system to move the movable rod on the hydraulic cylinder 202 downward, when moving, the stamping plate 203 connected thereto moves downward along the axis of the guide vertical rod 200, when the stamping plate 203 moves downward, it will drive the lower pushing arm 205, the rectangular frame 206, the pressing plate 207, the vertical block 210 and the stamping head 211 to move downward, and in the process of moving, since the fourth spring 214 is in a natural elongation state, the locking rod 217 at this time will be inserted into the insertion hole of the rectangular frame 206 and the vertical block 210, so that the stamping head 211 and the pressing plate 207 move downward synchronously, and when the stamping head 211 moves downward, the arc-shaped surface at the lower end thereof will abut against the sample, at this time the entire stamping table 131 moves downward, in the process of moving, it will drive or act downward on the lifting plate 108 through the connecting arm 109 to move downward, and in the process of moving, the first spring 107 is compressed, at the same time, the lower extension rod 110 will also move downward, and the conical head 133 acts on the conical hole 134, so that the lower extension rod 110 and the stamping table 131 are automatically moved, so that the outer periphery of the conical head 133 abuts against the inner wall of the conical hole 134, and the lower wall of the stamping seat 112 abuts against the upper wall of the backing plate 105, and in this process, the sample also moves. Under the support of the stamping table 131 and the stamping of the stamping head 211, it will bend along the lengthwise center line or the weld. In the initial stage of bending, due to the stamping action of the stamping head 211 and the lack of support of the lower stamping groove 146 of the sample, the middle part of the sample will be concave downward, and since the stamping groove 146 can also make the bending part of the corrosion surface not be subjected to external force and naturally bend, and in the process of continuous bending, the included angle of the sample formed by bending gradually decreases from 180 degrees, and in the process of decreasing, the corrosion surface of the sample abuts against the inclined guide surface 148 and then is tangent to the outer periphery of the roller 149, and when the corrosion surface of the sample is tangent to the roller 149, the sample will move downward due to the stamping action of the stamping head 211, and in the process of moving, since the corrosion surface of the sample is tangent to the roller 149, in the process of bending, it can avoid scratching the corrosion surface, the stamping head 211 continuously moves downward until the included angle of the sample is an acute angle, at this time the bending part of the sample will stretch into the arc-shaped notch of the stamping groove 146.

[0045] Step 05, when the angle of the sample changes from a right angle to an acute angle, the pressing plate 207 will also approach the punch cross arm 120, and before the pressing plate 207 approaches the punch cross arm 120, the opening wheel 220 first contacts the inclined wall 119, and when the opening wheel 220 contacts the upper end of the inclined wall 119, it will cause the opening wheel 220, the opening and closing plate 216, and the locking rod 217 to move outward, and in the process of moving, the fourth spring 214 is compressed. At this time, the distance between the pressing plate 207 and the punch cross arm 120 is equal to the vertical distance of the inclined wall 119, and the horizontal distance of the inclined wall 119 is greater than or equal to the distance between the inner end surface of the locking rod 217 and the outer wall of the vertical block 210. Therefore, when the lower wall of the pressing plate 207 and the upper wall of the punch cross arm 120 abut, the locking rod 217 is disconnected from the vertical block 210.

[0046] Step 06, the punch plate 203 continues to move downward under the action of the hydraulic cylinder 202, and in the process of moving, the punch head 211 stops moving due to the resistance of the sample, and the sample is positioned by the punch head 211 to prevent displacement of the sample during bending. When the lower wall of the pressing plate 207 and the upper wall of the punch cross arm 120 abut, the punch cross arm 120 is pushed to move downward, and the downward movement of the punch cross arm 120 drives the side pushing plate 123 to move downward, and in the process of moving, the second spring 127 is compressed. At this time, the rod 128 passes through the lateral section of the side pushing plate 123 and the pressing plate 207 and moves upward, and as the side pushing plate 123 moves downward, the inclined groove 125 on the side pushing plate 123 acts on the pressing sleeve 144, thereby causing the pressing sleeve 144 to move inward, and in the process of moving, the locking plate 136 moves inward, and the end of the locking plate 136 is located inside the inclined pressing groove 122. When the locking plate 136 moves inward, it is disconnected from the limiting of the second rotating shaft 140, so that it can move inward. When the locking plate 136 moves, the opening wheel 220 rolls on the outer wall of the outer supporting vertical plate 118. When the end of the locking plate 136 is located inside the inclined pressing groove 122, the lower wall of the punch cross arm 120 abuts on the upper end surface of the movable side plate 116, and the outer circumference of the opening wheel 220 abuts on the upper end surface of the convex part 117. In order to achieve this action, the distance between the lower wall of the punch cross arm 120 and the upper end surface of the movable side plate 116 is equal to the distance between the lower end point of the inclined wall 119 and the upper end surface of the convex part 117, the vertical length of the inclined groove 125 is equal to the distance between the lower wall of the punch cross arm 120 and the upper end surface of the movable side plate 116, and the distance between the end surface of the locking plate 136 and the intersection point between the upper edge of the locking plate 136 and the inner wall of the inclined pressing groove 122 is less than or equal to the horizontal length of the inclined groove 125.

[0047] Step 07, after step 06, the punch cross arm 120 will press down the movable side plate 116 to move downward, the outer side wall inside the inclined pressing groove 122 on the movable side plate 116 abuts on the outer periphery of the roller 142 during the downward movement of the movable side plate 116, thereby moving the inner top rod 139 inward, and making the inner top rod 139 act on the corrosion surface of the sample bent into a V-shaped structure, and pushing the sample inward to continue to bend inward, until the inner wall of the sample abuts on the outer wall of the punch head 211, at this time, the 180-degree bending operation of the sample is completed, and in the process, the third spring 209 is compressed.

[0048] In order to elaborate the bending process, the bending steps are disassembled into steps 04 to 07 as described above, and in actual bending, it is completed in one step.

[0049] Step 08, after the punching is completed, the hydraulic cylinder 202 drives the pressing plate 207 and the punch head 211 to restore the movement until it returns to the initial state, that is, after recovery, the locking rod 217 is inserted into the insertion hole of the vertical block 210.

[0050] Step 09, pull out the punch table 131, and make the inner top rod 139 and the movable side plate 116 return to the initial state, the sign after recovery is that the second rotating shaft 140 is inserted into the locking slot 138 of the locking plate 136. And again perform the bending operation of other samples.

[0051] The above only describes the preferred embodiments of the present application, and is not used to limit the present application. Obviously, those skilled in the art can make various modifications and changes to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and changes of the present application belong to the scope of the claims of the present application and the equivalent technology, the present application also intends to include these modifications and changes.

Claims

1. An intergranular corrosion test specimen bending device characterized by comprising: The utility model provides a sample 180-degree bending device, which comprises a bending mechanism (1), a stamping mechanism (2) is fixed on the bending mechanism (1), the bending mechanism (1) is used for the placement and positioning of a sample, and the stamping mechanism (2) is used for the 180-degree bending of the sample; the bending mechanism (1) comprises a base (100), a pair of guide rails (101) are installed on the base (100), a moving plate (103) is slidably arranged on the guide rails (101), side plates (104) are installed at the two ends of the moving plate (103), a backing plate (105) is installed at the upper end of the side plate (104), a pair of L-shaped connecting arms (109) are arranged through the backing plate (105), a stamping seat (112) is installed at the upper end of the connecting arm (109), a stamping table (131) is installed on the stamping seat (112), wing plates (145) are formed at the two sides of the upper end of the stamping table (131), a stamping groove (146) is formed in an open manner at the upper end of the stamping table (131), the bottom of the stamping groove (146) is in an arc-shaped structure, the two sides of the stamping groove (146) have stamping surfaces, the upper end of the stamping surface is vertically provided with a vertical surface (147), the upper end of the vertical surface (147) is provided with an inclined guide surface (148), the upper end of the inclined guide surface (148) extends outwardly and obliquely, an inner recessed arc groove is formed in the inclined surface of the inclined guide surface (148), a roller (149) is rotatably arranged in the inner recessed arc groove, first rotating shafts (150) are formed at the two ends of the roller (149), limiting side plates (129) are arranged at the two sides of the stamping seat (112), the first rotating shafts (150) are rotatably arranged on the limiting side plates (129), the limiting side plates (129) are located at the two ends of the opening of the stamping groove (146), a pair of waist-shaped holes (130) are formed in the upper end of the limiting side plates (129) and are arranged in a transverse manner, a pair of inner top rods (139) are arranged between the limiting side plates (129), second rotating shafts (140) are formed at the two ends of the inner top rods (139), the second rotating shafts (140) are movably arranged in the waist-shaped holes (130), limiting rings (141) are fixed on the second rotating shafts (140) and are located outside the limiting side plates (129); two pairs of guide rods (115) are arranged on the stamping seat (112), fixed end plates (114) are fixed at the upper and lower ends of the guide rods (115) located at the same end, the fixed end plate (114) located at the lower end is installed on the stamping seat (112), movable side plates (116) are movably arranged on the guide rods (115) located at the same side and are located outside the limiting side plates (129), a pair of inclined pressing grooves (122) are formed in the movable side plates (116) and are arranged in a symmetrical manner, the upper end of the inclined pressing groove (122) is inwardly and obliquely arranged, a pair of convex portions (117) are formed in the upper end of the movable side plates (116), outer supporting vertical plates (118) are formed in the upper end of the convex portions (117), the outer supporting vertical plates (118) are flush with the inner end surfaces of the convex portions (117), inclined walls (119) are formed in the side walls of the outer supporting vertical plates (118) and are inwardly and obliquely arranged.The convex parts (117) are provided with stamping cross arms (120) which are vertically movable, rectangular holes (121) are formed in the stamping cross arms (120), lower end seats (126) are installed on the outer walls of the movable side plates (116), the lower end seats (126) are connected with a pair of penetrating rods (128), the upper ends of the penetrating rods (128) are penetrated into the two ends of the stamping cross arms (120), the penetrating rods (128) are sleeved with second springs (127), the penetrating rods (128) are movably provided with L-shaped side push plates (123), the penetrating rods (128) are penetrated into the horizontal sections of the side push plates (123), the second springs (127) are located between the horizontal sections of the side push plates (123) and the lower end seats (126), the side push plates (123) are provided with moving holes (124), the lower end seats (126) are penetrated into the moving holes (124), the lower ends of the side push plates (123) are symmetrically provided with a pair of inclined grooves (125), the upper ends of the inclined grooves (125) are inclinedly extended inward, the inclined grooves (125) are movably provided with pressing sleeves (144), the movable side plates (116) are installed with two pairs of limiting screws (135), each pair of limiting screws (135) is movably provided with a locking plate (136), the locking plates (136) are provided with a pair of long holes (137), the limiting screws (135) are penetrated into the long holes (137), the outer side ends of the locking plates (136) are provided with locking grooves (138), the inner side ends of the locking plates (136) are connected with outer extension shafts (143), the pressing sleeves (144) are rotatably provided at the outer side ends of the outer extension shafts (143); the outer side ends of the second rotating shafts (140) are connected with rollers (142) through bearings, the rollers (142) are penetrated into the inclined pressing grooves (122), and the second rotating shafts (140) are clamped into the locking grooves (138).

2. The intergranular corrosion test specimen bending device according to claim 1, characterized by The stamping mechanism (2) comprises a plurality of guide vertical rods (200) mounted on the base (100), the upper end of the guide vertical rod (200) is provided with a top plate (201), the top plate (201) is provided with a hydraulic cylinder (202), the movable end of the hydraulic cylinder (202) is fixed with a stamping plate (203), the stamping plate (203) is movably arranged on the guide vertical rod (200), the lower wall of the stamping plate (203) is provided with a fixed lower plate (204), the fixed lower plate (204) is provided with a pair of lower push arms (205), the lower end of the lower push arm (205) is welded with a rectangular frame (206), the lower end of the rectangular frame (206) is welded with a pressing plate (207), the through rod (128) is arranged at the two ends of the pressing plate (207), the pressing plate (207) is movably provided with a vertical block (210), the vertical block (210) is movably arranged in the rectangular hole (121), the lower end of the vertical block (210) is fixed with a stamping head (211), the lower end of the stamping head (211) is in an arc-shaped structure, the upper end of the vertical block (210) is connected with a pair of vertical guide rods (208), the upper end of the vertical guide rod (208) is arranged on the fixed lower plate (204) and the stamping plate (203), the vertical guide rod (208) is sleeved with a third spring (209), the lower end of the third spring (209) abuts against the upper end face of the vertical block (210), the upper end of the third spring (209) abuts against the lower wall of the fixed lower plate (204); The two ends of the pressing plate (207) are respectively provided with side vertical plates (212), each pair of side vertical plates (212) located at the same end is fixed with a horizontal guide rod (213), the horizontal guide rod (213) is sleeved with a pair of fourth springs (214) and inner push arms (215), the fourth spring (214) is located between the inner push arm (215) and the side vertical plate (212), the inner push arms (215) located at the same side are welded with an opening and closing plate (216), the opening and closing plate (216) is fixed with a plurality of locking rods (217), the locking rod (217) is arranged at the two sides of the rectangular frame (206), the upper end of the vertical block (210) is provided with a plurality of insertion holes, the two ends of the opening and closing plate (216) are welded with a strutting arm (218), the lower end of the strutting arm (218) is rotatably provided with a strutting wheel (220) through a third shaft (219), the strutting arm (218) is provided with a groove, and the strutting wheel (220) is located in the groove.

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