Workpiece placing rack for machining center

Abstract

The utility model relates to work piece place technical field especially, it relates to n, including the rack, the rack is connected with the locating seat, still include the support component, the support component is connected with the placing plate on, the placing plate is connected with the clamping component, the clamping component and the outer surface of work piece contact, the one side end surface of clamping component is connected with the suction pipe, the input end of suction pipe is connected with the vacuum pump, the output end of suction pipe is linked together with the inner chamber of clamping component. In the utility model, when needing to clamp work piece, place it in the placing plate, make clamping component through the vacuum pump effect, so that clamping component can clamp work piece, prevent the phenomenon that work piece appears deformation by the fixed mode of adsorption to prevent the phenomenon that work piece appears deformation by too much clamping force to thin wall work piece, thereby influence the finished product quality problem of work piece.

Description

Technical Field

[0001] This utility model relates to the field of workpiece placement technology, and in particular to a workpiece placement rack for machining centers. Background Technology

[0002] In modern manufacturing, machining centers, as high-precision equipment integrating multiple processing functions such as milling, drilling, and boring, are widely used in the mass production and precision machining of automotive parts, aerospace components, and precision instrument parts. Currently, the mainstream workpiece placement racks of machining centers on the market generally adopt the "extrusion force clamping" principle to fix the workpiece. Specifically, they can be divided into mechanical screw clamping, pneumatic drive clamping, and hydraulic drive clamping. By applying continuous extrusion force to the workpiece surface through the clamping assembly, the static friction between the extrusion force and the workpiece is used to counteract the radial force, axial force, and vibration generated by the cutting tool during the machining process, thereby ensuring the stability of the workpiece position in the machining coordinate system.

[0003] However, with the increasing demand for lightweight and high-precision components in the high-end manufacturing sector, the proportion of thin-walled workpieces being processed is increasing year by year. The technical defects of existing extrusion pressure clamping racks are gradually becoming apparent. Specifically, the structural characteristics of thin-walled workpieces determine that their resistance to bending and extrusion is weak. Even slight over-extension or uneven distribution of extrusion pressure during clamping can lead to plastic deformation of the workpiece. Workpiece deformation not only directly destroys the initial structural accuracy of the workpiece, but also causes deviation between the actual position and the preset position in the machining coordinate system, resulting in a mismatch between the tool path and the theoretical machining trajectory of the workpiece. Ultimately, this leads to problems such as out-of-tolerance machining dimensions and unqualified surface roughness. Therefore, this application aims to solve the problem that extrusion pressure clamping easily causes deformation of thin-walled parts, destroys initial accuracy, and causes machining position deviation and out-of-tolerance dimensions. A workpiece rack for machining centers is proposed. Utility Model Content

[0004] To overcome the problem that existing extrusion clamping racks can cause plastic deformation when used on thin-walled parts with weak bending and compressive strength, even slight unevenness or excessive extrusion pressure during clamping can damage the initial accuracy of the workpiece, causing it to deviate from the preset position in the machining coordinate system, resulting in a mismatch between the tool path and the theoretical trajectory, and causing unqualified machining dimensions and surface roughness.

[0005] The technical solution of this utility model is as follows: a workpiece placement rack for a machining center, including a placement rack, a positioning seat connected to the placement rack, and a support assembly. A placement plate is connected to the support assembly, and a clamping assembly is connected to the placement plate. The clamping assembly is in contact with the outer surface of the workpiece. A suction tube is connected to one end face of the clamping assembly. A vacuum pump is connected to the input end of the suction tube, and the output end of the suction tube is connected to the inner cavity of the clamping assembly.

[0006] Preferably, the clamping assembly includes a protective cover, which is fixedly connected to the placement plate. A baffle plate is connected to one side end face of the protective cover, and a clamping rod is slidably connected to the baffle plate. A return spring is sleeved on the outer side of the clamping rod, and a connecting plate is connected to the inner wall of the protective cover. The two ends of the return spring are respectively connected to the connecting plate and the protective cover. The clamping rod has a through hole that extends horizontally through it. The space formed by the protective cover and the connecting plate is the inner cavity of the clamping assembly. The through hole of the clamping rod is connected to the inner cavity of the clamping assembly.

[0007] Preferably, a sliding seat is connected to the lower end face of the placement plate, a fixed wedge plate is provided on the outer side of the sliding seat, an adjustment groove is provided on the fixed wedge plate, and the fixed wedge plate is slidably connected to the sliding seat; A limiting ratchet block is rotatably connected to the sliding seat, and a movable cover is provided on the outer side of the fixed wedge plate. A connecting ratchet is connected to the inner wall of the movable cover.

[0008] Preferably, a movable head is connected to one end of the connecting ratchet, and a fixed sleeve is connected to the inner wall of the fixed wedge plate, with the fixed sleeve slidably connected to the movable head.

[0009] Preferably, a positioning slide rail is connected to the upper surface of the movable cover, and a positioning slide piece is connected to the upper surface of the fixed wedge plate, with the positioning slide rail and the positioning slide piece being slidably connected.

[0010] Preferably, a support base is connected to the lower end surface of the movable cover, and a movable plate is connected to the lower end of the support base. The movable plate is slidably connected to the placement frame. A fixing plate is connected to the lower end face of the fixing wedge plate, and a limiting piece is connected to the upper end face of the fixing plate. The limiting piece is slidably connected to the movable cover.

[0011] Preferably, a connecting piece is connected to one end face of both the movable plate and the fixed plate, and an elastic rope is connected between two adjacent connecting pieces.

[0012] The beneficial effects of this utility model are: 1. When it is necessary to clamp the workpiece, place it on the placement plate, and use the vacuum pump to activate the clamping assembly so that the clamping assembly can clamp the workpiece. The adsorption-type fixing method prevents excessive clamping force from being applied to the thin-walled workpiece, which could cause deformation of the workpiece and thus affect the quality of the finished product. 2. When the workpiece is clamped, the surface first contacts the clamping rod. The unevenness of the workpiece surface will drive part of the clamping rod to move, so that the clamping rod can fit against the outer surface of the workpiece, thereby achieving positioning and clamping of the uneven workpiece. At the same time, through the through hole opened on the clamping rod, after the clamping rod completes the positioning of the workpiece, it can also complete the vacuum adsorption of the workpiece through the through hole to relieve the pressure applied to the outer surface of the workpiece. 3. By setting a fixed wedge plate, the workpiece is positioned and fixed. Once the cutting edge applies pressure to the workpiece, this pressure will force the placement plate in contact with the workpiece to move along the fixed wedge plate. This horizontal force is decomposed by the fixed wedge plate into a vertically downward force that presses the workpiece, and a horizontal force borne by the fixture body. The greater the applied cutting force, the greater the clamping force generated by the fixed wedge plate. This solves the problem of workpiece clamping by adsorption. However, when the cutting edge is processing the workpiece, it will continuously apply force to the workpiece, which may cause the vacuum-adsorbed workpiece to fall off due to pressure. At the same time, the connecting ratchet and the limiting ratchet block cooperate to further prevent the placement plate from moving along the fixed wedge plate, so as to fundamentally eliminate the phenomenon of workpiece slippage. 4. When the position of the sliding seat needs to be adjusted due to the size of the workpiece, the movable cover can be separated from the fixed wedge plate by pulling the fixed handle, and the limiting ratchet block can be disengaged from the connecting ratchet. This will drive the sliding seat to slide on the fixed wedge plate to adjust to the appropriate position for workpiece processing, thereby greatly improving the usability of the entire workpiece placement rack. Attached Figure Description

[0013] Figure 1 The diagram shown is a three-dimensional structural schematic of Embodiment 1 of the workpiece placement rack of this utility model; Figure 2 The diagram shown is a three-dimensional structural schematic of the clamping rod of Embodiment 2 of the workpiece placement rack of this utility model; Figure 3 The diagram shown is a schematic representation of the connecting ratchet of Embodiment 2 of the workpiece placement rack of this utility model. Figure 4 The diagram shown is a three-dimensional structural schematic of the elastic rope in Embodiment 2 of the workpiece placement rack of this utility model. Figure 5 The diagram shown is a three-dimensional structural schematic of the positioning slide rail of Embodiment 2 of the workpiece placement rack of this utility model. Figure 6 The diagram shown is a schematic diagram of workpiece positioning and fixing in Embodiment 2 of the workpiece placement rack of this utility model; Figure 7 The diagram shown is a schematic representation of the separation of the movable cover of Embodiment 2 of the workpiece placement rack of this utility model; Figure 8 The diagram shown is an adjustment schematic of the sliding seat of Embodiment 2 of the workpiece placement rack of this utility model.

[0014] Explanation of reference numerals in the attached drawings: 1. Placement frame; 2. Positioning seat; 301. Fixed plate; 302. Limiting piece; 303. Movable plate; 304. Support seat; 305. Connecting piece; 306. Elastic rope; 401. Movable cover; 402. Positioning slide rail; 403. Connecting ratchet; 404. Movable head; 405. Fixed handle; 501. Fixed wedge plate; 502. Adjustment groove; 503. Positioning slide; 504. Fixed sleeve; 505. Positioning strip; 601. Sliding seat; 602. Auxiliary wheel; 603. Limiting ratchet block; 604. Placement plate; 605. Protective cover; 606. Connecting plate; 607. Positioning hole; 608. Clamping rod; 609. Return spring; 610. Gas collection hood; 611. Suction pipe; 612. Vacuum pump; 613. Baffle plate. Detailed Implementation

[0015] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0016] Example 1 refer to Figure 1 The structure shown is a workpiece placement rack for a machining center, including a placement rack 1, a positioning seat 2 connected to the placement rack 1, and a support assembly. A placement plate 604 is connected to the support assembly, and a clamping assembly is connected to the placement plate 604. The clamping assembly is in contact with the outer surface of the workpiece. A suction pipe 611 is connected to one end face of the clamping assembly. A vacuum pump 612 is connected to the input end of the suction pipe 611, and the output end of the suction pipe 611 is connected to the inner cavity of the clamping assembly.

[0017] The placement plate 604 can be configured as shown in the attached instruction manual. Figure 5 The "L" shape shown can also be set to other shapes, such as "C" shape, etc. The 612 vacuum pump is generally a dry claw vacuum pump of model Cobra NC 0400. When it is necessary to clamp the workpiece, it is placed on the placement plate 604. The clamping assembly is activated by the vacuum pump 612 so that the clamping assembly can clamp the workpiece. The adsorption-type fixing method prevents the application of excessive clamping force to the thin-walled workpiece, which could cause deformation of the workpiece and thus affect the quality of the finished product.

[0018] Example 2 Based on the above embodiment 1, in order to solve the problem that when using vacuum adsorption to position and fix workpieces, it is often impossible to achieve sufficient adhesion and adsorption when encountering non-smooth surfaces of the workpiece, refer to Figures 2-8 The structure shown; Unlike Embodiment 1, the clamping assembly includes a protective cover 605, which is fixedly connected to the placement plate 604. A baffle plate 613 is connected to one end face of the protective cover 605. A clamping rod 608 is slidably connected to the baffle plate 613. A return spring 609 is sleeved on the outer side of the clamping rod 608. A connecting plate 606 is connected to the inner wall of the protective cover 605. The two ends of the return spring 609 are respectively connected to the connecting plate 606 and the protective cover 605.

[0019] The clamping rod 608 has a through hole that extends horizontally through it. The space formed by the protective cover 605 and the connecting plate 606 is the inner cavity of the clamping assembly. The through hole of the clamping rod 608 is connected to the inner cavity of the clamping assembly. The connecting plate 606 has a positioning hole 607 that penetrates the wall of the connecting plate 606. The clamping rod 608 is slidably connected to the connecting plate 606 through the positioning hole 607. A gas collecting cover 610 is connected to one side end face of the protective cover 605. The gas collecting cover 610 is connected to the inner cavity of the clamping assembly. When the workpiece is clamped, it first contacts the clamping rod 608. The unevenness of the workpiece surface will drive the corresponding clamping rod 608 to move, so that the clamping rod 608 can fit tightly against the outer surface of the workpiece, thereby realizing the positioning and clamping of the uneven workpiece. At the same time, through the through hole opened on the clamping rod 608, after the clamping rod 608 has completed the positioning of the workpiece, it can also complete the vacuum adsorption of the workpiece through the through hole, so as to reduce the pressure applied to the outer surface of the workpiece.

[0020] Furthermore, a sliding seat 601 is connected to the lower end face of the placement plate 604, and a fixed wedge plate 501 is provided on the outer side of the sliding seat 601. An adjustment groove 502 is provided on the fixed wedge plate 501, and the fixed wedge plate 501 is slidably connected to the sliding seat 601. A limiting ratchet block 603 is rotatably connected to the sliding seat 601, and a movable cover 401 is provided on the outer side of the fixed wedge plate 501. A connecting ratchet 403 is connected to the inner wall of the movable cover 401.

[0021] Among them, a fixed handle 405 is connected to one side end face of the movable cover 401, a positioning strip 505 is connected to the fixed wedge plate 501, and an auxiliary wheel 602 is rotatably connected to the sliding seat 601. By setting the fixed wedge plate 501, the workpiece is positioned and fixed. Once the cutting edge applies pressure to the workpiece, this pressure will force the placement plate 604 in contact with the workpiece to move along the fixed wedge plate 501. This horizontal force is decomposed by the fixed wedge plate 501 into a vertically downward force that presses the workpiece, and a horizontal force borne by the fixture body. The greater the applied cutting force, the greater the clamping force generated by the fixed wedge plate 501. This solves the problem of clamping the workpiece by adsorption. However, when the cutting edge is processing the workpiece, it will continuously apply force to the workpiece, which may cause the vacuum-adsorbed workpiece to fall off due to pressure. At the same time, the connecting ratchet 403 and the limiting ratchet block 603 further prevent the placement plate 604 from moving along the fixed wedge plate 501, so as to fundamentally eliminate the phenomenon of workpiece slippage.

[0022] Furthermore, a movable head 404 is connected to one end of the connecting ratchet 403, and a fixed sleeve 504 is connected to the inner wall of the fixed wedge plate 501. The fixed sleeve 504 is slidably connected to the movable head 404.

[0023] Furthermore, a positioning slide rail 402 is connected to the upper surface of the movable cover 401, and a positioning slide plate 503 is connected to the upper surface of the fixed wedge plate 501. The positioning slide rail 402 and the positioning slide plate 503 are slidably connected.

[0024] Furthermore, a support base 304 is connected to the lower end surface of the movable cover 401, and a movable plate 303 is connected to the lower end of the support base 304. The movable plate 303 is slidably connected to the placement rack 1. A fixing plate 301 is connected to the lower end face of the fixing wedge plate 501, and a limiting piece 302 is connected to the upper end face of the fixing plate 301. The limiting piece 302 is slidably connected to the movable cover 401.

[0025] When the position of the sliding seat 601 needs to be adjusted due to the size of the workpiece, the movable cover 401 can be separated from the fixed wedge plate 501 by pulling the fixed handle 405, and the limiting ratchet block 603 can be disengaged from the connecting ratchet 403. This will drive the sliding seat 601 to slide on the fixed wedge plate 501 to adjust to a suitable position for workpiece processing, thereby greatly improving the usability of the entire workpiece placement rack.

[0026] Furthermore, connecting pieces 305 are connected to one side end face of both the movable plate 303 and the fixed plate 301, and elastic ropes 306 are connected between two adjacent connecting pieces 305.

[0027] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A workpiece placement rack for a machining center, comprising a placement rack (1), wherein a positioning seat (2) is connected to the placement rack (1), characterized in that: It also includes a support assembly, on which a placement plate (604) is connected. A clamping assembly is connected to the placement plate (604), the clamping assembly being in contact with the outer surface of the workpiece. A suction tube (611) is connected to one end face of the clamping assembly. A vacuum pump (612) is connected to the input end of the suction tube (611), and the output end of the suction tube (611) is connected to the inner cavity of the clamping assembly. The clamping assembly includes a protective cover (605). The cover (605) is fixedly connected to the placement plate (604). A baffle plate (613) is connected to one side end face of the protective cover (605). A clamping rod (608) is slidably connected to the baffle plate (613). A return spring (609) is sleeved on the outside of the clamping rod (608). A connecting plate (606) is connected to the inner wall of the protective cover (605). The two ends of the return spring (609) are respectively connected to the connecting plate (606) and the protective cover (605). The clamping rod (608) has a through hole that extends horizontally through the clamping rod (608). The space formed by the protective cover (605) and the connecting plate (606) is the inner cavity of the clamping assembly. The through hole of the clamping rod (608) is connected to the inner cavity of the clamping assembly.

2. The workpiece placement rack for a machining center according to claim 1, characterized in that: A sliding seat (601) is connected to the lower end face of the placement plate (604). A fixed wedge plate (501) is provided on the outer side of the sliding seat (601). An adjustment groove (502) is provided on the fixed wedge plate (501). The fixed wedge plate (501) is slidably connected to the sliding seat (601). The sliding seat (601) is rotatably connected to a limiting ratchet block (603), and the outer side of the fixed wedge plate (501) is provided with a movable cover (401), and the inner wall of the movable cover (401) is connected with a connecting ratchet (403).

3. The workpiece placement rack for a machining center according to claim 2, characterized in that: A movable head (404) is connected to one end of the connecting ratchet (403), and a fixed sleeve (504) is connected to the inner wall of the fixed wedge plate (501). The fixed sleeve (504) is slidably connected to the movable head (404).

4. A workpiece placement rack for a machining center according to claim 2, characterized in that: The upper surface of the movable cover (401) is connected to a positioning slide rail (402), and the upper surface of the fixed wedge plate (501) is connected to a positioning slide piece (503). The positioning slide rail (402) and the positioning slide piece (503) are slidably connected.

5. A workpiece placement rack for a machining center according to claim 2, characterized in that: A support base (304) is connected to the lower end surface of the movable cover (401), and a movable plate (303) is connected to the lower end of the support base (304). The movable plate (303) is slidably connected to the placement rack (1). A fixing plate (301) is connected to the lower end face of the fixing wedge plate (501), and a limiting piece (302) is connected to the upper end face of the fixing plate (301). The limiting piece (302) is slidably connected to the movable cover (401).

6. A workpiece placement rack for a machining center according to claim 5, characterized in that: The movable plate (303) and the fixed plate (301) are each connected to a connecting piece (305) on one side end face, and an elastic rope (306) is connected between two adjacent connecting pieces (305).

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