Accurate positioning device and working method

Abstract

According to the precise positioning device and the working method, through wedge-shaped blocks which slide relatively, centering positioning and clamping of a mold can be achieved only through pushing of a hydraulic rod, the working efficiency of the positioning device is improved, meanwhile, the precise positioning device can adapt to and replace different molds, the universality of the positioning device is improved, and the working efficiency of the positioning device is improved. According to the technical scheme, the device comprises an upper template, a lower template and a centering mechanism; the lower die and the centering mechanism are installed in the middle of the lower die plate, a lower limiting plate is arranged below the lower die plate, and a lower bearing plate is arranged below the lower limiting plate. An installation groove of the centering mechanism is formed in the center of the lower die plate, the fixed wedge blocks are oppositely arranged and fixedly installed in the installation groove, and the movable wedge blocks are connected with the fixed wedge blocks in a sliding mode. The upper die plate and the lower die plate are positioned through a positioning rod, a die guide rail is arranged on the upper die plate, an upper die hydraulic rod is arranged on the upper bearing plate, and an upper die is arranged on the lower portion of the upper die plate.

Description

Technical Field

[0001] The present invention belongs to the technical field of precision machining, and in particular relates to a precise positioning device and a working method. Background Art

[0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art.

[0003] Stamping is a forming process in which a press and a die apply external force to plates, strips, tubes and profiles to cause them to undergo plastic deformation or separation, thereby obtaining a workpiece (stamping) of the desired shape and size. The processing of the workpiece requires the use of a positioning device to clamp and position the workpiece, and there are many types of positioning devices. Most of the current positioning devices require manual centering and manual fixing.

[0004] At present, the existing technology CN102699723B includes components such as concentric disks, concentric cones, and concentric guide rods. The concentric disks are positioned by cooperating with the concentric grooves of the concentric support blocks through their concentric bosses and are fixed to the concentric support blocks by bolts. The problem is that the positioning fixture needs to be manually positioned at three points and clamped by tightening bolts; on the one hand, the accuracy of manual three-point positioning cannot be guaranteed, and on the other hand, the work efficiency of manual positioning is low; therefore, there is an urgent need for a positioning device that can solve the problem that the mold cannot be automatically clamped and positioned. Summary of the invention

[0005] In view of the above problems, the present invention provides a precise positioning device and a working method, and provides a simple centering mechanism. Two pairs of wedge blocks that can slide relative to each other are arranged, and the centering positioning and clamping of the mold can be achieved only by pushing with a hydraulic rod, thereby improving the working efficiency of the positioning device. At the same time, it can also adapt to and replace different molds, thereby improving the versatility of the positioning device.

[0006] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0007] In a first aspect, the present invention provides a precise positioning device, including an upper bearing plate, a lower bearing plate, an upper template, a lower template, an upper limit plate, a lower limit plate, an upper mold, a lower mold and a centering mechanism;

[0008] The lower mold and the centering mechanism are installed in the middle position of the lower template, a lower limit plate is arranged below the lower template, and a lower bearing plate is arranged below the lower limit plate;

[0009] The centering mechanism comprises a fixed wedge block and a movable wedge block, a mounting groove of the centering mechanism is provided at the center position of the lower template, the fixed wedge block is fixedly installed in the mounting groove, the fixed wedge blocks are arranged opposite to each other, and the movable wedge block is slidably connected to the fixed wedge block;

[0010] The upper template is positioned with the lower template by a positioning rod, an upper limit plate is installed above the upper template, and an upper bearing plate is arranged above the upper limit plate; a mold guide rail is arranged on the upper template, an upper mold hydraulic rod is arranged on the upper bearing plate, an upper mold is arranged below the upper template, and the upper mold hydraulic rod is fixedly connected to the upper mold.

[0011] Further, the lower mold is placed at the center position of the centering mechanism.

[0012] Furthermore, the movable wedge block and the wedge surface of the fixed wedge block are connected via a dovetail groove structure.

[0013] Furthermore, the contact surface between the movable wedge and the lower mold is completely in contact with the lower mold.

[0014] Furthermore, two centering hydraulic rods are provided on the upper bearing plate, passing through the upper limit plate and the upper template and contacting the movable wedge block, and the two centering hydraulic rods are respectively arranged above the movable wedge block.

[0015] Furthermore, the centering hydraulic rod and the upper die hydraulic rod are hydraulic gas struts, and the length of the centering hydraulic rod is greater than the length of the upper die hydraulic rod.

[0016] Furthermore, a ejector pin is fixedly arranged on the lower bearing plate, passes through the lower limit plate and the lower template, and contacts with the movable wedge block.

[0017] Furthermore, two ejector pins are provided, and the ejector pins are respectively arranged below the movable wedge blocks.

[0018] Furthermore, the ejector pin is a hydraulic gas strut.

[0019] In a second aspect, the present invention further provides a working method of a precise positioning device, comprising the following steps:

[0020] S1. When a workpiece needs to be processed, the workpiece is placed on the lower mold. The upper bearing plate slowly descends under the action of the hydraulic press. The moving wedge moves under the push of the centering hydraulic rod. The moving wedge slides along the dovetail groove during the downward movement. Under the action of the two moving wedges, the lower mold is pressed and automatically centered.

[0021] S2. When the workpiece is processed, the movable slide block is at the lowest point, the upper bearing plate moves upward under the action of the hydraulic press, the upper mold is separated from the workpiece, the centering hydraulic rod and the upper mold hydraulic rod gradually release pressure, and the two ejectors will push the movable wedge block to move upward along the dovetail groove and separate from the lower mold.

[0022] Compared with the prior art, the present invention has the following advantages and positive effects:

[0023] The beneficial effects of the precise positioning device of the present invention are as follows:

[0024] The present invention realizes automatic centering and clamping of the lower mold through the cooperation of the movable wedge and the fixed wedge in the centering mechanism, utilizing the relative sliding between the movable wedge and the fixed wedge and the pushing of the centering hydraulic rod. The automatic centering function and convenient operation can reduce the adjustment time and improve the processing efficiency of the workpiece; ensure the accurate positioning of the workpiece and avoid the occurrence of defective products during the processing.

[0025] The lower mold of the present invention is directly placed on the lower mold plate in the middle of the centering mechanism, which can realize the rapid replacement of the lower mold. At the same time, the movable wedge is also a replaceable component, which can be replaced according to lower molds of different shapes to adapt to lower molds of different shapes, so that the contact surface between the movable wedge and the lower mold is completely fitted with the lower mold, thereby improving the versatility of the entire device. The centering hydraulic rod and the ejector push the movable wedge to separate from the lower mold during the processing and after the processing, respectively. After separation, the lower mold and the movable wedge can be removed, avoiding the problem of difficulty in disassembly due to tight contact between the movable wedges. The entire replacement process is simple and convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The accompanying drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0027] Figure 1 This is the overall structural diagram of the positioning device of the present invention;

[0028] Figure 2 It is a cross-sectional view of the ejector pin of the positioning device of the present invention;

[0029] Figure 3 This is an exploded structural diagram of the positioning device of the present invention.

[0030] In the figure: 1. upper bearing plate; 2. upper limit plate; 3. upper template; 4. positioning rod; 5. lower template; 6. lower limit plate; 7. lower bearing plate; 8. fixed wedge; 9. movable wedge; 10. ejector pin; 11. lower mold; 12. upper mold; 13. mold guide; 14. centering hydraulic rod; 15. upper mold hydraulic rod. DETAILED DESCRIPTION

[0031] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in the present invention have the same meanings as those commonly understood by those skilled in the art to which the present invention belongs.

[0032] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present invention. As used herein, unless otherwise explicitly stated in the present invention, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "include" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof;

[0033] This embodiment discloses a precise positioning device, such as Figure 1-Figure 3 As shown, it includes an upper bearing plate 1, a lower bearing plate 7, an upper template 3, a lower template 5, an upper limit plate 2, a lower limit plate 6, an upper mold 12, a lower mold 11 and a centering mechanism. The lower mold 11 and the centering mechanism are installed in the middle position of the lower template 5. A lower limit plate 6 is arranged below the lower template 5, and a lower bearing plate 7 is arranged below the lower limit plate 6; the upper template 3 is positioned with the lower template 5 through a positioning rod 4, an upper limit plate 2 is installed above the upper template 3, and an upper bearing plate 1 is arranged above the upper limit plate 2; a mold guide rail 13 is arranged on the upper template 3, and the mold guide rail is used for positioning and guiding the upper mold to avoid displacement of the upper mold when the hardness of the workpiece is high; an upper mold hydraulic rod 15 is arranged on the upper bearing plate 1, and an upper mold 12 is arranged below the upper template 3, and the upper mold hydraulic rod 15 is fixedly connected to the upper mold 12.

[0034] The lower mold 11 is installed at the center position of the centering mechanism. The centering mechanism includes a fixed wedge block 8 and a movable wedge block 9. The center position of the lower template 5 is provided with a mounting groove of the centering mechanism. The fixed wedge block 8 is fixedly installed in the mounting groove. The fixed wedge blocks 8 are arranged relatively to each other. The movable wedge block 9 is slidably connected to the fixed wedge block 8. The wedge surfaces of the movable wedge block 9 and the fixed wedge block 8 are connected by a dovetail groove structure, so that the movable wedge block 9 can slide along the wedge surface of the fixed wedge block 8 without separating from the fixed wedge block 8; the two movable sliders move closer to the center of the centering mechanism through the dovetail groove structure during the up and down movement, so that the lower mold 11 is clamped and fixed during the centering process under the action of the centering structure, which solves the problem of inaccurate positioning and inability to accurately center when there is a size difference in the inner ring of the blank workpiece.

[0035] The contact surfaces of the two movable wedges 9 and the lower mold 11 are completely fitted with the lower mold 11. The movable wedges 9 can be taken out along the dovetail groove structure and replaced with movable wedges 9 with different contact surface shapes, thereby being able to adapt to lower molds 11 of different shapes, thereby improving the versatility of the entire device.

[0036] Two centering hydraulic rods 14 are also provided on the upper bearing plate 1, which pass through the upper limit plate 2 and the upper template 3 and contact with the moving wedge 9. The two centering hydraulic rods 14 are respectively arranged above the moving wedge 9. The centering hydraulic rod 14 pushes the moving wedge 9 to move, so as to realize the centering and clamping of the lower mold 11. The centering hydraulic rod 14 and the moving wedge 9 are transmitted by contact, and no connection is required. The centering hydraulic rod 14 and the upper mold hydraulic rod 15 are hydraulic gas struts. The length of the centering hydraulic rod 14 is greater than that of the upper mold hydraulic rod 15. When the workpiece needs to be processed, the workpiece is placed on the lower mold 11, and the upper bearing plate 1 slowly descends under the action of the hydraulic press. During the descent, the centering hydraulic rod 14 first contacts the moving wedge 9, and the moving wedge 9 is pushed to move by the centering hydraulic rod 14. During the downward movement, the moving wedge 9 presses the lower mold 11 and automatically centers it to ensure that the lower mold 11 is always in the middle position, so that the workpiece positioning is automatically centered, avoiding the situation of defective products in the workpiece during the processing.

[0037] The lower bearing plate 7 is fixed with an ejector pin 10. There are two ejector pins 10, which pass through the lower limit plate 6 and the lower mold plate 5 and contact the moving wedge block 9. The two ejector pins 10 are arranged below the moving wedge block 9. When the workpiece is processed, the moving wedge block 9 is at the lowest point. At this time, the moving wedge block 9 and the lower mold 11 are in a clamping state. The upper bearing plate 1 moves upward under the action of the hydraulic press, and the upper mold 12 is separated from the workpiece. The centering hydraulic rod 14 and the upper mold hydraulic rod 15 gradually release pressure. The two ejector pins 10 will push the moving wedge block 9 to move upward along the dovetail groove and separate from the lower mold 11. The ejector pin 10 is a variable length hydraulic rod, and its maximum length should ensure that the moving wedge block 9 does not separate from the fixed wedge block 8. When the centering hydraulic rod 14 gradually releases pressure, the moving wedge block 9 gradually separates from the lower mold under the action of the ejector pin 10.

[0038] Working method:

[0039] S1. When the workpiece needs to be processed, the workpiece is placed on the lower mold 11, and the upper bearing plate 1 slowly descends under the action of the hydraulic press. Since the length of the upper mold hydraulic rod 15 is shorter than the length of the centering hydraulic rod 14, the centering hydraulic rod 14 first contacts the moving wedge 9 during the descent of the upper bearing plate 1. The moving wedge 9 moves under the push of the centering hydraulic rod 14. The moving wedge 9 slides along the dovetail groove during the downward movement. Under the action of the two moving wedges 9, the lower mold 11 is pressed and automatically centered to ensure that the lower mold 11 is always in the middle position, so that the workpiece positioning is automatically centered, avoiding the situation of defective workpieces during the processing.

[0040] S2. After the workpiece is processed, the movable slider is at the lowest point. At this time, the movable slider and the lower mold 11 are in a clamping state. The upper bearing plate 1 moves upward under the action of the hydraulic press, and the upper mold 12 is separated from the workpiece. The centering hydraulic rod 14 and the upper mold hydraulic rod 15 gradually release pressure, and the two ejectors 10 will push the movable wedge block 9 to move upward along the dovetail groove and separate from the lower mold 11; this is convenient for re-centering operations or replacing lower molds 11 of different shapes.

[0041] Although the above describes the specific implementation mode of the present invention in conjunction with the accompanying drawings, it is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art on the basis of the technical solution of the present invention without creative work are still within the scope of protection of the present invention.

Claims

1. A precise positioning device, characterized in that: It includes an upper bearing plate, a lower bearing plate, an upper template, a lower template, an upper limit plate, a lower limit plate, an upper mold, a lower mold and a centering mechanism; The lower mold and the centering mechanism are installed in the middle position of the lower template, a lower limit plate is arranged below the lower template, and a lower bearing plate is arranged below the lower limit plate; The centering mechanism comprises a fixed wedge block and a movable wedge block, a mounting groove of the centering mechanism is provided at the center position of the lower template, the fixed wedge block is fixedly installed in the mounting groove, the fixed wedge blocks are arranged opposite to each other, and the movable wedge block is slidably connected to the fixed wedge block; The upper template is positioned with the lower template by a positioning rod, an upper limit plate is installed above the upper template, and an upper bearing plate is arranged above the upper limit plate; a mold guide rail is arranged on the upper template, an upper mold hydraulic rod is arranged on the upper bearing plate, an upper mold is arranged below the upper template, and the upper mold hydraulic rod is fixedly connected to the upper mold.

2. A precise positioning device as claimed in claim 1, characterized in that: The lower mold is placed at the center of the centering mechanism.

3. A precise positioning device as claimed in claim 1, characterized in that: The movable wedge block and the wedge surface of the fixed wedge block are connected via a dovetail groove structure.

4. A precise positioning device as claimed in claim 1, characterized in that: The contact surface between the movable wedge and the lower mold is completely in contact with the lower mold.

5. A precise positioning device as claimed in claim 1, characterized in that: The upper bearing plate is also provided with two centering hydraulic rods, which pass through the upper limit plate and the upper template and contact with the moving wedge block. The two centering hydraulic rods are respectively arranged above the moving wedge block.

6. A precise positioning device as claimed in claim 5, characterized in that: The centering hydraulic rod and the upper die hydraulic rod are hydraulic gas struts, and the length of the centering hydraulic rod is greater than the length of the upper die hydraulic rod.

7. A precise positioning device as claimed in claim 1, characterized in that: The lower bearing plate is fixedly provided with an ejector pin which passes through the lower limiting plate and the lower template and contacts with the movable wedge block.

8. A precise positioning device as claimed in claim 7, characterized in that: Two ejector pins are provided and are respectively arranged below the movable wedge blocks.

9. A precise positioning device as claimed in claim 7, characterized in that: The ejector pin is a hydraulic gas strut.

10. A working method of a precise positioning device as claimed in claims 1 to 8, characterized in that: The steps include: S1. When a workpiece needs to be processed, the workpiece is placed on the lower mold. The upper bearing plate slowly descends under the action of the hydraulic press. The moving wedge moves under the push of the centering hydraulic rod. The moving wedge slides along the dovetail groove during the downward movement. Under the action of the two moving wedges, the lower mold is pressed and automatically centered. S2. When the workpiece is processed, the movable slide block is at the lowest point, the upper bearing plate moves upward under the action of the hydraulic press, the upper mold is separated from the workpiece, the centering hydraulic rod and the upper mold hydraulic rod gradually release pressure, and the two ejectors will push the movable wedge block to move upward along the dovetail groove and separate from the lower mold.

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