Self-centering replaceable clamp of CNC machining center

Abstract

The utility model discloses a CNC machining center self-centering replaceable clamp, and relates to the field of numerical control machining, the CNC machining center self-centering replaceable clamp comprises a fixed bottom plate, a top plate is arranged above the fixed bottom plate, a pneumatic telescopic rod is arranged at the bottom end of the top plate above the fixed bottom plate, and the output end of the pneumatic telescopic rod is fixedly connected with a connecting rod; a limiting block is arranged at the top end of the connecting rod, a clamping base is arranged above the connecting rod, and a dismounting and mounting mechanism used for adjusting the clamp is arranged at the top end of the clamping base. According to the self-centering replaceable clamp for the CNC machining center, soft materials are extremely prone to deformation during machining, the machining speed can be greatly increased and machining deformation of the soft materials can be reduced by adopting the mode that the peripheries are held tightly, clamping force is dispersed all around and stress is uniform, and therefore the requirement for high-flatness products machined by the soft materials is met; the clamping blocks can be replaced according to the shape of a product and the abrasion condition in the using process, the universality of the clamp is improved, and the clamp can be suitable for different shapes.

Description

TECHNICAL FIELD

[0001] The utility model relates to numerical control processing technical field, concretely is a kind of CNC machining center self-centering replaceable fixture. BACKGROUND

[0002] It is an important automated processing technology in modern manufacturing industry, it is through computer program control machine tool movement, realizes the precision machining to metal, plastic, wood and other materials, the fixture of CNC machining center needs to be stably clamped to workpiece when using, so that the subsequent processing of workpiece can be more accurate;

[0003] When using, since the size and shape of workpiece can change in the process of clamping and processing of fixture, the size of clamping fixture is not convenient to change, which can cause wear of workpiece, and the center of different workpieces is different, which causes instability during processing.

[0004] In order to overcome the above-mentioned defects, the prior art (Chinese patent with publication number CN215967539U, application date 2021-04-20) a replaceable fixture for numerical control machine tool processing. The product is clamped and fixed by the symmetrical design of meniscus clamp, and the meniscus clamp is moved on the threaded rod by rotating the handle, the product is clamped tightly, and the product is loosened by rotating the handle in the opposite direction, the diversified products can be stably clamped by using the inner cylinder and the outer cylinder, and the product convex or concave structure can be fixed and clamped by extruding the outer cylinder and compressing the spring.

[0005] The above-mentioned mechanism can stably clamp diversified products by moving the meniscus clamp on the threaded rod, but in actual use, it is easy to cause instability during clamping due to different centers of workpieces, and it is easy to cause instability during clamping due to small size. UTILITY MODEL CONTENTS

[0006] The utility model aims at providing a kind of CNC machining center self-centering replaceable fixture, to solve the problem that the size and shape of workpiece can change in the process of clamping and processing of fixture in the above background technology, so the size of clamping fixture is not convenient to change, which can cause wear of workpiece, and the center of different workpieces is different, which causes instability during processing.

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of CNC machining center self-centering replaceable fixture, including fixed base plate, the top plate of the top of fixed base plate is provided with pneumatic telescopic link, and the output end of pneumatic telescopic link is fixedly connected with connecting rod, and the top end of connecting rod is provided with limit block;

[0008] The clamping seat is provided above the connecting rod, and a dismounting mechanism for adjusting the clamp is arranged at the top end of the clamping seat, the dismounting mechanism comprises a clamping block, the clamping block is hingedly connected to the top end of the clamping seat, a fixing block is hingedly connected to the top end of the clamping seat, and a fixing groove matched with the fixing block is formed in the upper clamping block.

[0009] The top end of the fixing base is threadedly connected with bolts, and the end of the bolt is provided with an anti-loosening mechanism.

[0010] Further, the outer side of the clamping seat is provided with movable grooves, and the movable grooves are equally distributed on the outer side of the clamping seat.

[0011] Further, the inner side of the clamping seat is provided with an elastic push block, and the outer side of the elastic push block is matched with the inner side of the limiting block.

[0012] Further, the top end of the clamping block is provided with a placing groove, and the inner part of the placing groove is hingedly connected with a workpiece body.

[0013] Further, the anti-loosening mechanism comprises a limiting frame, and the limiting frame is slidingly connected to the top end of the fixing base.

[0014] Further, the two sides of the front end of the fixing base are fixedly connected with mounting blocks, one end of the mounting block is connected with the limiting frame through a connecting spring, and the limiting frame and the mounting block constitute an elastic structure through the connecting spring.

[0015] Further, the two sides of the front end of the fixing base are provided with sliding rails, and the bottom end of the limiting frame is fixedly connected with sliding blocks matched with the sliding rails.

[0016] Compared with the prior art, the utility model has the advantages that:

[0017] 1. The workpiece to be clamped is placed inside the placing groove, the output end of the pneumatic telescopic rod moves downward to drive the connecting rod to move downward, so that the inner side below the limiting block and the outer side of the elastic push block are clamped with each other, the elastic push block is reset in position by the limiting block, so that the clamping block and the clamping seat are reset in angle due to their own elastic force, and the workpiece above the clamping block can be clamped, so that the position of the workpiece can be stabilized, and since the centers of different workpiece bodies are different, the workpiece body placed above the placing groove can effectively limit the shaking of the workpiece body due to the center position offset, increase the stability of the workpiece body when being clamped and limited, and the machining process positioning accuracy is determined by product clamp positioning error and machine tool repeat positioning accuracy, the clamp positioning error can be eliminated, only the machine tool itself repeat positioning accuracy is left, the machining quality of the product is improved by eliminating the clamp positioning error;

[0018] Further, the soft material processing is extremely easy to deform, by adopting the four-around tight holding, the clamping force is dispersed and uniformly stressed around, the processing speed can be greatly improved and the soft material processing deformation can be reduced, so as to ensure the high flatness product requirement of the soft material processing;

[0019] Further, the product is clamped at the same center each time by the clamping block, the relative center of the product is ensured, the clamping block can be replaced according to the product shape and the wear condition in the use process, the universality of the clamp is increased, the clamp can be applied to products of different shapes and sizes, the replaceable structure can reduce the clamp replacement time and the production cycle, the four-around uniform stress can avoid the deformation of the workpiece body caused by the single-direction large force pressing of the clamping block, the processing speed can be improved, the processing time can be reduced, the competitiveness can be improved, and the high flatness and high precision requirements of the product can be maintained;

[0020] 2. The fixing bottom plate and the clamp can be connected as a whole by the bolt, so that the position of the clamp as a whole is fixed, since the clamp needs to be repeatedly clamped, the bolt may be loose after long-term use, therefore, the position of the limiting frame is adjusted, so that the limiting frame can limit the height of the bolt to avoid the loosening of the bolt;

[0021] Further, the position of the limiting frame can be flexibly adjusted by the connecting spring on one side of the limiting frame, so that the limiting frame can avoid shielding the bolt when the bolt is screwed, and the limiting frame can move more smoothly by being provided with the sliding block and the sliding rail, so that the jamming condition can be effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a front view structural schematic diagram of the utility model;

[0023] Figure 2 It is a front view sectional view structural schematic diagram of the utility model;

[0024] Figure 3 It is a structure schematic view of the clamping mechanism of the utility model;

[0025] Figure 4 It is an explosion structure schematic view of the clamping mechanism of the utility model;

[0026] Figure 5 It is a partial sectional structure schematic view of the clamping mechanism of the utility model;

[0027] Figure 6 It is a structure schematic view of the connecting rod and the limiting block of the utility model;

[0028] Figure 7 It is a structure schematic view of the anti-loosening mechanism of the utility model.

[0029] In the drawing: 1, fixed bottom plate; 2, pneumatic telescopic rod; 3, top plate; 4, clamping seat; 5, clamping block; 6, workpiece body; 7, connecting rod; 8, limiting block; 9, elastic push block; 10, fixed block; 11, fixed groove; 12, movable groove; 13, placing groove; 14, bolt; 15, limiting frame; 16, connecting spring; 17, mounting block; 18, sliding block; 19, sliding rail. DETAILED DESCRIPTION

[0030] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0031] Embodiment one:

[0032] As Figures 1-6 shown in the technical scheme, in order to solve the problem that the center is different due to different shapes of the workpiece body 6 in the process of clamping processing, resulting in shaking when clamping, the CNC machining center self-centering replaceable clamp discloses a clamping mechanism, which comprises a fixed bottom plate 1, a top plate 3 is arranged above the fixed bottom plate 1, a pneumatic telescopic rod 2 is arranged at the bottom end of the top plate 3 above the fixed bottom plate 1, the output end of the pneumatic telescopic rod 2 is fixedly connected with a connecting rod 7, the top end of the connecting rod 7 is provided with a limiting block 8, movable grooves 12 are formed on the outer side of the clamping seat 4, the movable grooves 12 are equally angularly distributed on the outer side of the clamping seat 4, an elastic push block 9 is arranged on the inner side of the clamping seat 4, and the outer side of the elastic push block 9 and the inner side of the limiting block 8 are mutually adapted.

[0033] In this case, the workpiece to be clamped is placed inside the placement groove 13, the output end of the pneumatic telescopic rod 2 moves downward to drive the connecting rod 7 to move downward, so that the inner side below the limiting block 8 and the outer side of the elastic push block 9 are clamped with each other, the elastic push block 9 is reset in position by the limiting block 8, so that the clamping block 5 and the clamping seat 4 are reset in angle due to the self elastic force, and the workpiece can be clamped above the clamping block 5, so that the position of the workpiece can be stabilized, and since the centers of different workpiece bodies 6 are different, the workpiece body 6 can be effectively limited from shaking due to the center position offset when placed above the placement groove 13, the stability of the workpiece body 6 when clamped and limited is increased, the machining process positioning accuracy is determined by the product clamp positioning error and the machine tool repeat positioning accuracy, the clamp positioning error can be eliminated, only the machine tool itself repeat positioning accuracy is left, the machining quality of the product is improved by eliminating the clamp positioning error.

[0034] And the soft material is extremely easy to deform, by adopting the four around tight embrace, the clamping force is dispersed and uniformly stressed around, which can greatly improve the processing speed and reduce the deformation of soft material processing, so as to ensure the high flatness requirement of soft material processing.

[0035] Embodiment two:

[0036] As Figures 1-4 shown in the technical scheme, in order to solve the problem that the size and shape of the workpiece may change, so that the size of the clamp is not convenient to change and causes the wear of the workpiece: the CNC machining center self-centering replaceable clamp discloses a dismounting mechanism, the clamping seat 4 is arranged above the connecting rod 7, the top end of the clamping seat 4 is provided with a dismounting mechanism for adjusting the clamp, the dismounting mechanism comprises the clamping block 5, the clamping block 5 is clamped and connected to the top end of the clamping seat 4, the top end of the clamping seat 4 is clamped and connected with the fixed block 10, and the upper end of the clamping block 5 is provided with the fixed groove 11 matched with the fixed block 10.

[0037] In this case, the product is clamped at the same center every time by the clamping block 5, which ensures the relative center of the product, the clamping block 5 can be replaced according to the shape of the product and the wear condition in the use process, which increases the universality of the clamp and can be suitable for products of different shapes and sizes, the replaceable structure can also reduce the clamp replacement time and the production cycle, the uniform stress around can avoid the deformation of the workpiece body 6 caused by the single direction tight pressing of the clamping block 5, can improve the processing speed, reduce the processing time, improve the competitiveness, and maintain the high flatness and high precision requirements of the product;

[0038] When the clamping block 5 needs to be replaced, the fixed groove 11 on the clamping block 5 is separated from the fixed block 10 that is clamped and connected inside the clamping seat 4 by pulling the clamping block 5 upwards, so that the clamping block 5 can be separated from the clamping seat 4 and disassembled, and after the clamping block 5 is disassembled, the placement groove 13 with different inner shapes can be quickly replaced, so that the upper part of the clamping block 5 can stably place different workpiece bodies 6, thereby facilitating better subsequent processing of the workpiece.

[0039] Embodiment three:

[0040] As Figure 1 , Figure 2 and Figure 7 indicated, in order to solve the problem that the overall fixture is easy to cause the bolt 14 to loosen due to long-term work when connected with the numerical control center machining equipment: the CNC machining center self-centering replaceable fixture discloses an anti-loosening mechanism, both sides of the top end of the fixed base plate 1 are threadedly connected with the bolts 14, and one end of the bolt 14 is provided with an anti-loosening mechanism for avoiding loosening, the anti-loosening mechanism comprises a limiting frame 15, and the limiting frame 15 is slidingly connected to the top end of the fixed base plate 1, the limiting frame 15 is clamped and connected to the outside of the bolt 14, both sides of the front end of the fixed base plate 1 are fixedly connected with mounting blocks 17, and one end of the mounting block 17 is connected with the limiting frame 15 through the connecting spring 16, the limiting frame 15 and the mounting block 17 form an elastic structure through the connecting spring 16, both sides of the front end of the fixed base plate 1 are provided with sliding rails 19, and the bottom end of the limiting frame 15 is fixedly connected with sliding blocks 18 matched with the sliding rails 19, and the limiting frame 15 and the fixed base plate 1 are slidingly connected through the sliding blocks 18 and the sliding rails 19 to form a sliding structure.

[0041] In this example, the fixed base plate 1 and the overall fixture are connected through the bolt 14, so that the position of the overall fixture is fixed. Since the fixture needs to be clamped repeatedly, the bolt 14 may loosen after long-term use, so the position of the limiting frame 15 is adjusted to limit the height of the bolt 14 to avoid loosening of the bolt 14. The position of the limiting frame 15 can be adjusted flexibly through the connecting spring 16 on one side of the limiting frame 15, so that the limiting frame 15 can avoid blocking the bolt 14 when the bolt 14 is screwed. At the same time, the limiting frame 15 can move more smoothly through the sliding blocks 18 and the sliding rails 19, effectively avoiding the jamming condition.

[0042] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A CNC machining center self-centering replaceable clamp, comprising a fixed base plate (1), a top plate (3) arranged above the fixed base plate (1), a pneumatic telescopic rod (2) arranged at the bottom end of the top plate (3) above the fixed base plate (1), and a connecting rod (7) fixedly connected to the output end of the pneumatic telescopic rod (2), and a limiting block (8) arranged at the top end of the connecting rod (7); characterized in that a clamping seat (4) arranged above the connecting rod (7), and a dismounting mechanism for clamp adjustment arranged at the top end of the clamping seat (4), the dismounting mechanism comprising a clamping block (5) clamped and connected to the top end of the clamping seat (4), the top end of the clamping seat (4) being clamped and connected with a fixed block (10), and a fixed groove (11) matched with the fixed block (10) being formed in the upper clamping block (5); both sides of the top end of the fixed base plate (1) are threadedly connected with a bolt (14), and the bolt (14) is provided at one end with an anti-loosening mechanism for avoiding loosening.

2. A self-centering changeable fixture of a CNC machining center according to claim 1, characterized in that: Both sides of the clamping seat (4) are provided with movable grooves (12) arranged at equal angles.

3. A self-centering changeable fixture of a CNC machining center according to claim 2, characterized in that: The inner side of the clamping seat (4) is provided with an elastic push block (9), and the outer side of the elastic push block (9) is adapted to the inner side of the limiting block (8).

4. A self-centering changeable fixture of a CNC machining center according to claim 3, characterized in that: The top end of the clamping block (5) is provided with a placing groove (13), and the workpiece body (6) is clamped and connected in the placing groove (13).

5. The self-centering changeable fixture of CNC machining center according to claim 1, characterized in that: The anti-loosening mechanism comprises a limiting frame (15) slidably connected to the top end of the fixed base plate (1), and the limiting frame (15) is clamped and connected to the outer side of the bolt (14).

6. A self-centering changeable fixture of a CNC machining center according to claim 5, characterized in that: Both sides of the front end of the fixed base plate (1) are fixedly connected with a mounting block (17), one end of the mounting block (17) is connected with the limiting frame (15) through a connecting spring (16), and the limiting frame (15) and the mounting block (17) constitute an elastic structure through the connecting spring (16).

7. A self-centering changeable fixture of a CNC machining center according to claim 6, characterized in that: Both sides of the front end of the fixed base plate (1) are provided with sliding rails (19), and the bottom end of the limiting frame (15) is fixedly connected with a sliding block (18) matched with the sliding rails (19), and the limiting frame (15) and the fixed base plate (1) are slidably connected through the sliding block (18) and the sliding rails (19) to constitute a sliding structure.

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