U-shaped cylindrical pin bending tool

Abstract

The utility model discloses a kind of U-shaped cylindrical pin bending tool, belong to the technical field of machining, comprising: the bottom plate of being made with sliding slot and center through-hole, the base of being installed in bottom plate bottom and inside installation has spring, the shell fixed on bottom plate, the inner shell fixed in the left and right sides in shell interior, left and right platform block rotationally connected in two inner shell interiors, front and rear push block installed in shell front and rear side, recess die installed between left and right platform block, and male die with recess die die closing;The part to be formed is fixed in platform block top, adjust the interval of two inner shells and front and rear push block, male die presses down recess die, recess die promotes left and right platform block rotation and carries out bending, after bending, spring rebounds and pops out forming part.The utility model structure scientific and reasonable, use safe and convenient.

Description

Technical Field

[0001] This utility model belongs to the field of mechanical processing technology and relates to a U-shaped cylindrical pin bending tool. Background Technology

[0002] Bending fixtures are punches used to bend blanks or semi-finished parts into specific shapes. The structure of a bending fixture consists of two parts: a punch, a die, a positioning mechanism, a stripping mechanism, a guide mechanism, and fasteners. Existing U-shaped cylindrical pin bending fixtures require a completely new design for each change in a feature (including diameter, length, angle, or material). Each design of a new fixture involves a complete process of design, construction, trial molding, and finishing, resulting in a significant waste of manpower and resources. Utility Model Content

[0003] In view of the above problems, this utility model provides a U-shaped cylindrical pin bending tool.

[0004] The present invention adopts the following technical solution:

[0005] A U-shaped cylindrical pin bending fixture includes a left support seat 1, a right support seat 2, a base 3, a base plate 4, an outer shell 5, an inner shell 6, a left platform block 7, a right platform block 8, a punch 9, a die 10, a spherical nut 11, a round head bolt 12, a spring 13, a front push block 14, a cylindrical pin 15, and a rear push block 16.

[0006] The left support 1 and the right support 2 have the same structure and are arranged opposite each other. The lower end of the opposite side of the two has a groove for fixing to the hydraulic press equipment platform.

[0007] The two ends of the base plate 4 along its length are fixed to the top of the left and right support seats by internal hex bolts. The base plate 4 has a through hole in the center, and grooves with scales are made on both sides of the through hole along its length.

[0008] The base 3 is fixedly installed in the lower middle part of the base plate 4, and the two are fixedly connected by hexagonal bolts. A spring mounting hole is left in the center of the base 3 corresponding to the through hole of the base plate 4. The spring 13 is installed in the spring mounting hole to provide rebound force.

[0009] The outer shell 5 is a cavity structure with open top and bottom, and is fixedly installed on the base plate 4 by internal hex bolts. Threaded holes are made in the middle of the four side walls of the outer shell 5.

[0010] The inner shell 6 has a U-shaped structure, and two identical inner shells are provided. The U-shaped openings of the two inner shells are placed opposite each other on both sides of the outer shell 5. The two inner shells 6 have mounting holes on opposite sides. One end of the round-head bolt 12 is confined in the mounting hole and can rotate. The bolt post is threaded into the threaded holes on the two end side walls of the outer shell 5. The other end of the round-head bolt 12 is equipped with a ball nut 11. By rotating the round-head bolt 12, the position of the corresponding inner shell 6 in the outer shell 5 is adjusted, and the distance between the two inner shells 6 is determined by the scale on the base plate 4. The bottom of the two inner shells 6 is threaded with hexagon socket head cap screws, and the lower end of the hexagon socket head cap screws protrudes from the sliding groove on the base plate 4 and can slide in the sliding groove. By tightening the hexagon socket head cap screws, the position of the inner shell 6 is fixed. The upper part of the two side walls at the U-shaped openings of the two inner shells 6 are provided with cylindrical pin holes opposite each other.

[0011] The left platform block 7 and the right platform block 8 have the same structure, are symmetrically distributed and spaced apart, and have through holes on their upper parts. Two cylindrical pins 15 are inserted into the through holes of the left and right platform blocks respectively. The two ends of the cylindrical pins 15 are fixed in the cylindrical pin holes on the upper part of the two side walls of the inner shell 6. There is a gap between the bottom surface of the left and right platform blocks and the base plate 4, so that the left and right platform blocks can rotate around the cylindrical pins 15 respectively. The lower part of the opposite side of the left and right platform blocks has grooves with a sloping bottom surface. The upper surface of the left and right platform blocks has multiple cylindrical grooves of different specifications. The cylindrical grooves are arranged along the length of the base plate 4 and are used to place parts of different diameters to be formed. Threaded holes are made at different distances on both sides of the cylindrical grooves to fix the plates. The plates are used to control the length positioning of the parts to be formed. According to the bending position of the U-shaped cylindrical pin, the corresponding distance of the threaded hole is selected to fix and press the plate to the end of the part to be formed. Only one plate on one platform block can be used at a time.

[0012] The front push block 14 and the rear push block 16 have the same structure, both being sloping structures. They are placed opposite each other in the outer shell 5 along the width direction of the base plate 4 and located between the two inner shells 6. The bottom surfaces of the front and rear push blocks are slidably fitted with the base plate 4, and mounting holes are made on their opposite sides. One end of each of the other two round head bolts 12 is restricted in the mounting holes of the front and rear push blocks, and their bolt posts are fitted with threaded holes on the other two side walls of the outer shell 5. The other end of the round head bolts 12 is also fitted with ball nuts 11. The distance between the front and rear push blocks can be adjusted by rotating the round head bolts 12.

[0013] The die 10 is an axisymmetric cross-shaped long strip structure arranged along the width of the base plate 4. Its top surface is set according to the shape required for the bending of the U-shaped cylindrical pin. The lower part of the die 10 is cylindrical, passing through the through hole in the center of the base plate 4 and cooperating with the spring 13 in the base 3. The middle part of the die 10 is located in the groove of the left and right platform blocks. Its upper surface is flat. In the natural state of the spring 13, the upper surface of the middle part of the die 10 is in contact with the upper plane of the groove of the left and right platform blocks. At this time, the top of the die 10 is flush with the upper surface of the left and right platform blocks. The lower surface of the middle part of the die 10 is an arc structure. When the spring 13 is compressed, the arc structure is in contact with the inclined surface of the front and rear push blocks to prevent the die 10 from rotating. At the same time, the arc structure pushes the slope at the bottom of the groove of the left and right platform blocks, so that the upper parts of the left and right platform blocks move relative to each other to achieve bending.

[0014] The punch 9 is a T-shaped long strip structure with an assembly hole at its upper end for connection with equipment such as a hydraulic press. The lower end profile is set according to the shape required for the bending of the U-shaped cylindrical pin. The punch 9 is inserted between the left and right platform blocks to close with the die 10 and push the die 10 down, thus achieving the bending shape in conjunction with the left and right platform blocks.

[0015] Furthermore, the cylindrical grooves on the upper ends of the left platform block 7 and the right platform block 8 are set to the same specification, so as to realize the processing of multiple U-shaped cylindrical pins at one time.

[0016] The beneficial effects of this utility model are:

[0017] (1) This utility model controls the bending distance through the groove of the base plate, which can achieve the purpose of bending with different center distances of the same tooling.

[0018] (2) The cylindrical grooves of different specifications on the upper end of the left and right platform blocks can realize the bending of cylindrical pins of different diameters, or they can be designed as cylindrical grooves of the same specification to process multiple parts at one time and improve production efficiency; the plates at different distances on the upper end of the left and right platform blocks can realize the bending of cylindrical pins of different lengths.

[0019] (3) The overall structure of this utility model is simple. It can achieve the bending design of different cylindrical pin parts by simply changing the shape of the lower part of the punch and the upper part of the die. It does not need to consider factors such as springback, spring material design, and length design.

[0020] (4) The overall structure of this utility model is simple and compact, easy to assemble and disassemble, and the processing and replacement of individual parts are convenient. The grooves of the left and right support seats facilitate clamping on different equipment and platforms.

[0021] (5) This utility model can achieve the required rebound force for different bending materials by compressing the bottom spring, and control the rebound coefficient after the cylindrical pin is bent. Attached Figure Description

[0022] Figure 1 A three-dimensional structural diagram of a U-shaped cylindrical pin bending tool provided by this utility model;

[0023] Figure 2 for Figure 1 A sectional view;

[0024] Figure 3 A three-dimensional view and isometric view of a U-shaped cylindrical pin bending tool;

[0025] Among them, 1-left support, 2-right support, 3-base, 4-base plate, 5-outer shell, 6-inner shell, 7-left platform block, 8-right platform block, 9-punch, 10-die, 11-spherical nut, 12-round head bolt, 13-spring, 14-forward push block, 15-cylindrical pin, 16-rear push block. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the specific embodiments of this utility model will be described in detail below.

[0027] A U-shaped cylindrical pin bending fixture, such as Figures 1 to 3 As shown, it includes a left support base 1, a right support base 2, a base 3, a base plate 4, an outer shell 5, an inner shell 6, a left platform block 7, a right platform block 8, a punch 9, a die 10, a spherical nut 11, a round head bolt 12, a spring 13, a front push block 14, a cylindrical pin 15, and a rear push block 16.

[0028] The left support 1 and the right support 2 have the same structure and are arranged opposite each other. The lower end of the opposite side of the two has a groove for fixing to the hydraulic press equipment platform.

[0029] The two ends of the base plate 4 along its length are fixed to the top of the left and right support seats by internal hex bolts. The base plate 4 has a through hole in the center, and grooves with scales are made on both sides of the through hole along its length.

[0030] The base 3 is fixedly installed in the lower middle part of the base plate 4, and the two are fixedly connected by hexagonal bolts. A spring mounting hole is left in the center of the base 3 corresponding to the through hole of the base plate 4. The spring 13 is installed in the spring mounting hole to provide rebound force.

[0031] The outer shell 5 is a cavity structure with open top and bottom, and is fixedly installed on the base plate 4 by internal hex bolts. Threaded holes are made in the middle of the four side walls of the outer shell 5.

[0032] The inner shell 6 has a U-shaped structure, and two identical inner shells are provided. The U-shaped openings of the two inner shells are placed opposite each other on the left and right sides of the outer shell 5. The two inner shells 6 have mounting holes on their opposite sides. One end of the round-head bolt 12 is confined in the mounting hole and can rotate. The bolt post is threaded into the threaded holes on the left and right side walls of the outer shell 5. The other end of the round-head bolt 12 is equipped with a ball nut 11. By rotating the round-head bolt 12, the position of the corresponding inner shell 6 in the outer shell 5 is adjusted, and the distance between the two inner shells 6 is determined by the scale on the base plate 4. The bottom of the two inner shells 6 is threaded with hexagon socket head cap screws, and the lower end of the hexagon socket head cap screws protrudes from the sliding groove on the base plate 4 and can slide in the sliding groove. By tightening the hexagon socket head cap screws, the position of the inner shell 6 is fixed. The upper part of the two side walls of the U-shaped openings of the two inner shells 6 are provided with cylindrical pin holes facing each other.

[0033] The left platform block 7 and right platform block 8 have the same structure, are symmetrically distributed and spaced apart, and have through holes at their top. Two cylindrical pins 15 are inserted into the through holes of the left and right platform blocks respectively. The two ends of the cylindrical pins 15 are fixed in the cylindrical pin holes on the upper part of the two side walls of the inner shell 6. There is a gap between the bottom surface of the left and right platform blocks and the bottom plate 4, so that the left and right platform blocks can rotate around the cylindrical pins 15 respectively. Grooves are formed on the lower part of the opposite sides of the left and right platform blocks, and the bottom surface of the grooves is designed with a slope. Multiple cylindrical grooves of different specifications are formed on the upper surface of the left and right platform blocks. The cylindrical grooves are arranged along the length of the base plate 4 and are used to place parts of different diameters to be formed. Threaded holes are made at different distances on both sides of the cylindrical grooves to fix the plates. The plates are used to control the length positioning of the parts to be formed. According to the bending position of the U-shaped cylindrical pin, the corresponding distance of the threaded holes is selected to fix and press the plate to the end of the part to be formed. Only one plate on one platform block can be used at a time. In other embodiments, several cylindrical grooves on the upper end of the left and right platform blocks are set to the same specification to realize the processing of multiple U-shaped cylindrical pins at one time.

[0034] The front push block 14 and the rear push block 16 have the same structure, both being sloping structures. They are placed opposite each other in the outer shell 5 along the width direction of the base plate 4 and located between the two inner shells 6. The bottom surfaces of the front and rear push blocks are slidably fitted with the base plate 4. Mounting holes are made on the opposite sides of the two blocks. One end of each of the two round head bolts 12 is restricted in the mounting holes of the front and rear push blocks and can rotate. The bolt posts are fitted with threaded holes on the other two side walls of the outer shell 5. The other end of the round head bolts 12 is also fitted with ball nuts 11. The distance between the front and rear push blocks can be adjusted by rotating the round head bolts 12.

[0035] The die 10 is an axisymmetric cross-shaped elongated structure, arranged between the left and right platform blocks along the width direction of the base plate 4. Its top surface is set according to the shape required for the bending of the U-shaped cylindrical pin. The lower part of the die 10 is cylindrical, passing through the through hole in the center of the base plate 4 and cooperating with the spring 13 in the base 3. The middle part of the die 10 is located in the groove of the left and right platform blocks, and its upper surface is flat. In the natural state of the spring 13, the upper surface of the middle part of the die 10 is in contact with the upper surface of the groove of the left and right platform blocks. At this time, the top of the die 10 is flush with the upper surface of the left and right platform blocks. The lower surface of the middle part of the die 10 is an arc structure. When the spring 13 is compressed, the arc structure is in contact with the inclined surface of the front and rear push blocks to prevent the die 10 from rotating. At the same time, the arc structure pushes the slope at the bottom of the groove of the left and right platform blocks, so that the upper parts of the left and right platform blocks move relative to each other to achieve bending.

[0036] The punch 9 is a T-shaped long strip structure with an assembly hole at its upper end for connection with equipment such as a hydraulic press. The lower end profile is set according to the shape required for the bending of the U-shaped cylindrical pin. The punch 9 is inserted between the left and right platform blocks to close with the die 10 and push the die 10 down, thus achieving the bending shape in conjunction with the left and right platform blocks.

[0037] This embodiment achieves different widths for U-shaped cylindrical pin bending by adjusting the left and right spacing of the two inner shells 6 in conjunction with the die 10; it achieves bending of cylindrical pins of different diameters by using different specifications of the cylindrical grooves at the top of the left platform block 7 and the right platform block 8; it achieves bending of cylindrical pins of different lengths by adjusting the positioning of the fixed plate; and it achieves control of the bending springback by using the arc structure of the die 10 in conjunction with the slope at the bottom of the grooves of the left and right platform blocks to compress the spring 13. In summary, this embodiment can achieve bending of cylindrical pins of different diameters, lengths, angles, and materials.

[0038] The usage process in this embodiment is as follows:

[0039] First, select the required shapes of the die 10 and punch 9 according to the final U-shaped cylindrical pin drawing. Insert the lower end of the die 10 through the base plate 4 into the spring 13 inside the base 3. At this time, the upper surface of the middle structure of the die 10 is in contact with the upper plane of the grooves of the left platform block 7 and the right platform block 8, ensuring that the upper ends of the left platform block 7, the right platform block 8 and the die 10 are at the same horizontal position when the spring 13 is in its natural state. Adjust and fix the position of the inner shell 6, fix the left support seat 1 and the right support seat 2 on the equipment platform, and adjust and fix the position of the punch 9 on the equipment.

[0040] Next, select appropriate cylindrical grooves on the upper ends of the left platform block 7 and the right platform block 8 according to the diameter of the part to be bent, place the part to be bent in the corresponding cylindrical groove, adjust the position of the part to be bent according to the bending position, and fix it with the plate on the upper end of the left platform block 7.

[0041] By adjusting the positions of the front push block 17 and the rear push block 18, and by controlling the different contact positions between the slopes of the front push block 17 and the rear push block 18 and the arc structure of the die 10, the contact positions between the arc structure of the die 10 and the groove slopes of the left platform block 7 and the right platform block 8 are controlled, thereby controlling the angle of rotation of the left and right platform blocks around the cylindrical pin 15, thus achieving the purpose of controlling the amount of springback.

[0042] During operation, when the punch 9 moves downward, it presses the part to be bent into the die 10. At the same time, the die 10 compresses the spring 13 downward, and through the arc structure of the die 10, it moves relative to the inclined surfaces of the grooves of the left platform block 7 and the right platform block 8, causing the left and right platform blocks to rotate around the cylindrical pin 15, thus performing the bending. After bending is completed, the punch 9 moves upward, the spring 13 rebounds, and applies an upward force to the die 10. The die 10 moves upward, causing the left platform block 7 and the right platform block 8 to rotate around the cylindrical pin 15, returning to their initial state, thereby ejecting the bent U-shaped cylindrical pin.

[0043] In summary, the above are merely preferred embodiments of this utility model and are not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A U-shaped cylindrical pin bending fixture, characterized in that, Includes left support base (1), right support base (2), base (3), base plate (4), outer shell (5), inner shell (6), left platform block (7), right platform block (8), punch (9), die (10), spring (13), and cylindrical pin (15); The two ends of the base plate (4) along its length are fixed to the top of the left support (1) and the right support (2), and a through hole is made in the center of the base plate (4); The base (3) is fixedly installed in the lower middle part of the base plate (4), and a spring mounting hole is left at the corresponding through hole position of the base plate (4), and a spring (13) is installed inside; The outer shell (5) is a cavity structure with open top and bottom, and is fixedly installed on the base plate (4); The inner shell (6) is a U-shaped structure, and two of them are set with the same structure. The U-shaped openings of the two inner shells (6) are placed opposite each other on both sides inside the outer shell (5), and the distance between the two inner shells (6) is adjustable. The left platform block (7) and the right platform block (8) have the same structure. They are symmetrically distributed and have a gap. The upper part of the two platforms is mounted on the upper part of the two side walls of the U-shaped opening of the inner shell (6) by a cylindrical pin (15). There is a gap between the bottom surface of the left and right platform blocks and the bottom plate (4) so ​​that the left and right platform blocks can rotate around the cylindrical pin (15) respectively. The lower part of the opposite side of the left and right platform blocks has a groove with a sloping bottom surface. The top of the left and right platform blocks has threaded holes at different distances to fix the plates and press the end of the part to be formed. The die (10) is a cross-shaped long strip structure, arranged along the width direction of the base plate (4), and its top surface is set according to the shape of the U-shaped cylindrical pin required for bending. The lower part of the die (10) passes through the through hole in the center of the base plate (4) and cooperates with the spring (13) in the base (3). Its middle part is located in the groove of the left and right platform blocks, and its upper surface is flat. In the natural state of the spring (13), the upper surface of the middle part of the die (10) is in contact with the upper surface of the groove of the left and right platform blocks. At this time, the top of the die (10) is flush with the upper surface of the left and right platform blocks. The lower surface of the middle part of the die (10) is an arc structure. When the spring (13) is compressed, the arc structure pushes the slope at the bottom of the groove of the left and right platform blocks, so that the upper part of the left and right platform blocks moves relative to each other to achieve bending. The punch (9) is a T-shaped long strip structure. Its lower end is set according to the shape of the U-shaped cylindrical pin required for bending. The punch (9) is inserted between the left and right platform blocks and closes with the die (10) and pushes the die (10) down to cooperate with the left and right platform blocks to achieve bending.

2. The U-shaped cylindrical pin bending fixture according to claim 1, characterized in that, The left support (1) and right support (2) have grooves at the lower ends of their opposite sides for fixing to the hydraulic press platform.

3. The U-shaped cylindrical pin bending fixture according to claim 1, characterized in that, The bottom plate (4) has a through hole with grooves on both sides along the length direction. The bottom of the inner shell (6) is threaded with an internal hex bolt, which cooperates with the groove to fix the position of the inner shell (6).

4. The U-shaped cylindrical pin bending fixture according to claim 3, characterized in that, The base plate (4) has grooves on both sides engraved with scales to determine the position of the inner shell (6).

5. A U-shaped cylindrical pin bending fixture according to claim 1, characterized in that, The upper surfaces of the left platform block (7) and the right platform block (8) are provided with multiple cylindrical grooves of different specifications. The cylindrical grooves are arranged along the length of the base plate (4) and are used to place parts of different diameters to be formed.

6. A U-shaped cylindrical pin bending fixture according to claim 5, characterized in that, The cylindrical grooves at the upper ends of the left platform block (7) and the right platform block (8) are set to the same specification, so as to realize the processing of multiple U-shaped cylindrical pins at one time.

7. A U-shaped cylindrical pin bending fixture according to claim 1, characterized in that, It also includes a front push block (14) and a rear push block (16), both of which have the same structure and are both slope structures. They are placed opposite each other in the outer shell (5) along the width direction of the base plate (4) and located between the two inner shells (6). The distance between the front and rear push blocks is adjustable. When the spring (13) is compressed, the arc structure of the middle part of the die (10) contacts the inclined surface of the front and rear push blocks to prevent the die (10) from rotating.

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