Clamp for CNC machining

Abstract

The utility model discloses a CNC machining clamp, which comprises a base and a plurality of clamp bodies arranged on the base side by side, each clamp body comprises a fixed seat, a movable seat, a guide rail and a screw rod, the movable seat is arranged on the guide rail in a sliding manner, the fixed seat and the guide rail are fixedly arranged on the base, and the fixed seat and the movable seat are respectively provided with an axial limiting groove and a screw hole. A limiting ring is rotatably installed on the axial limiting groove, one end of the lead screw is fixedly connected with the limiting ring, the other end of the lead screw is in threaded connection with the screw hole, a transverse sliding groove is formed in the base, a linkage rack is installed on the transverse sliding groove in a sliding mode, a gear is connected to the linkage rack in an engaged mode, and the gear is detachably and fixedly connected with the lead screw. By arranging the transverse sliding groove, the linkage rack and the gear, linkage of a plurality of lead screws is achieved, a plurality of workpieces of different sizes can be clamped and loosened at the same time, the lead screws do not need to be screwed one by one, the feeding and discharging time of each time is greatly saved, and the machining efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of product processing technology, and in particular to a fixture for CNC machining. Background Technology

[0002] CNC machining is a crucial process in manufacturing, and CNC fixtures are key tools that directly impact machining efficiency and yield. Traditional machining processes use a fixture to fix the material on a worktable, a cutting tool to carve the material, and after machining, the material is removed from the fixture and a new material is placed in for machining. Chinese patent CN222660797U discloses a CNC machining fixture, which includes a base and three or more fixture bodies arranged side-by-side on the base. Each fixture body includes a fixed seat, three movable seats, a guide rail assembly, and a lead screw. Both the fixed and movable seats have through holes, and the lead screw passes through these holes. The guide rail assembly is parallel to the lead screw, and the movable seats are movably mounted on the guide rails. Nuts for locking the movable seats are provided on the outer sides of the fixed and movable seats. The workpiece is selected and fixed between the fixed and movable seats according to its size. The drawback of the prior art is that, since multiple workpieces of different sizes need to be clamped in multiple fixture bodies for processing, the lead screws need to be turned one by one each time the workpieces are loaded or unloaded, which is time-consuming and labor-intensive. Utility Model Content

[0003] This invention aims to solve the problems existing in the prior art by providing a CNC machining fixture that, after one clamping and debugging, can realize the linkage of multiple lead screws, facilitating repeated clamping and unclamping operations on multiple workpieces of different sizes, and saving time for each loading and unloading.

[0004] The technical solution adopted by this utility model to solve its technical problem is as follows: A CNC machining fixture includes a base and multiple fixture bodies arranged side by side on the base. The fixture body includes a fixed seat, a movable seat, a guide rail, and a lead screw. The guide rail and the lead screw are arranged parallel to each other. The movable seat is slidably arranged on the guide rail. The fixed seat and the guide rail are fixedly installed on the base. The fixed seat and the movable seat are respectively provided with an axial limiting groove and a screw hole. A limiting ring is rotatably installed on the axial limiting groove. One end of the lead screw is fixedly connected to the limiting ring, and the other end is threadedly connected to the screw hole. The base is provided with a transverse sliding groove, which is perpendicular to the lead screw. A linkage rack is slidably installed on the transverse sliding groove. A gear is meshed on the linkage rack, and the gear and the lead screw are detachably fixedly connected.

[0005] To further improve the design, the gear is provided with a shaft hole through which a lead screw passes. One end of the shaft hole is provided with a bushing, and a locking screw for fixing the lead screw is provided on the bushing.

[0006] To further improve the design, the lead screw is threaded with an anti-loosening nut for securing the bushing.

[0007] To further improve the design, the bottom of the fixing base is provided with a fixing hole, and the base is provided with a positioning hole. The positioning hole and the fixing hole are fixedly connected by a positioning pin.

[0008] In a further improvement, the fixed seat consists of an upper shaft seat and a lower shaft seat, with an axial limiting groove located between the upper shaft seat and the lower shaft seat, and the upper shaft seat and the lower shaft seat are fixedly connected by bolts.

[0009] To further improve the design, a lifting mechanism is provided between the linkage rack and the transverse slide groove.

[0010] In a further improvement, the lifting mechanism includes an inclined surface and an inclined slider. The inclined slider is installed in a transverse slide groove. A linkage rack is placed above the inclined slider. The bottom of the linkage rack is provided with an inclined surface that cooperates with the inclined slider. A side hole is provided on the transverse slide groove, and a push rod for pushing the inclined slider is threaded onto the side hole.

[0011] The beneficial effects of this utility model are: (1) By setting a transverse sliding groove, a linkage rack and gear, multiple lead screws can be linked. After one clamping and debugging, multiple workpieces of different sizes can be clamped and released at the same time without having to turn the lead screws one by one, which greatly saves the time for each loading and unloading and improves the processing efficiency. (2) Since the manual operation of each lead screw is reduced, problems such as uneven clamping force caused by inconsistent operation or fatigue are avoided, which further ensures the consistency and stability of the processing. (3) The gear and the lead screw are detachably fixed. This design makes it easy to adjust and maintain the fixture. When it is necessary to replace or repair a certain part, it can be quickly disassembled and processed, reducing the downtime of the equipment. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of this utility model;

[0013] Figure 2 This is a side sectional view of the fixture body.

[0014] Figure 3 for Figure 2 A magnified schematic diagram of a local structure;

[0015] Figure 4 A schematic diagram of the anti-loosening nut;

[0016] Explanation of reference numerals in the attached drawings: 1. Base; 11. Transverse slide groove; 12. Linkage rack; 13. Positioning hole; 14. Positioning pin; 2. Fixed seat; 21. Axial limiting groove; 22. Limiting ring; 23. Fixed hole; 24. Upper shaft seat; 25. Lower shaft seat; 3. Movable seat; 31. Screw hole; 4. Guide rail; 5. Lead screw; 51. Gear; 52. Bushing; 53. Locking screw; 54. Anti-loosening nut; 6. Lifting mechanism; 61. Inclined surface; 62. Inclined slider; 63. Top rod. Detailed Implementation

[0017] The present invention will be further described below with reference to the accompanying drawings:

[0018] See attached document Figure 1-2 This embodiment describes a CNC machining fixture, including a base 1 and multiple fixture bodies arranged side-by-side on the base 1. The base 1 is fixed to the machine tool worktable by magnetic attraction, bolts, or pressure blocks. The fixture body includes a fixed seat 2, a movable seat 3, a guide rail 4, and a lead screw 5. The guide rail 4 and the lead screw 5 are arranged parallel to each other. The movable seat 3 is slidably arranged on the guide rail 4. The fixed seat 2 and the guide rail 4 are fixedly installed on the base 1. The fixed seat 2 and the movable seat 3 are respectively provided with an axial limiting groove 21 and a screw hole 31. A limiting ring 22 is rotatably installed on the axial limiting groove 21. One end of the lead screw 5 is fixedly connected to the limiting ring 22, and the other end is threadedly connected to the screw hole 31. The base 1 is provided with a transverse sliding groove 11, which is perpendicular to the lead screw 5. A linkage rack 12 is slidably installed on the transverse sliding groove 11. A gear 51 is meshed on the linkage rack 12. The gear 51 and the lead screw 5 are detachably fixedly connected.

[0019] This CNC machining fixture achieves efficient and convenient workpiece clamping and machining operations through a unique structural design. During operation, the workpiece is first placed between the fixed seat 2 and the movable seat 3. Rotating the lead screw 5 causes the axial limiting groove 21 and the limiting ring 22 to engage, thus limiting the axial movement of the lead screw 5. The lead screw 5 engages with the threaded hole 31 on the movable seat 3, pushing the movable seat 3 to slide along the guide rail 4, thereby clamping or releasing the workpiece. Simultaneously, through the meshing transmission of the linkage rack 12 and gear 51 on the transverse slide groove 11, multiple lead screws 5 can operate in conjunction. When the linkage rack 12 slides in the transverse slide groove 11, it drives all the meshing gears 51 to rotate, thereby causing multiple lead screws 5 to rotate synchronously, achieving synchronous clamping or releasing of multiple fixture bodies. This eliminates the need to operate each lead screw individually, greatly improving clamping efficiency. This design not only simplifies the operation process and reduces labor intensity but also ensures that multiple workpieces receive uniform and stable clamping force during machining, thereby improving machining accuracy and quality. In addition, the detachable fixed connection between gear 51 and lead screw 5 allows each set of gear 51 to be disengaged from lead screw 5 individually, which facilitates workers to debug the equipment and perform initial clamping of workpieces of different sizes, further improving the reliability and flexibility of the fixture.

[0020] As attached Figure 3 As shown, the gear 51 has a shaft hole through which the lead screw 5 passes. One end of the shaft hole is provided with a bushing 52, and a locking screw 53 for fixing the lead screw 5 is provided on the bushing 52. When the locking screw 53 is tightened, the gear 51 is circumferentially fixed on the lead screw 5, and the lead screw can drive the gear to rotate. When the locking screw 53 is loosened, the gear 51 is separated from the lead screw 5, and no power transmission occurs.

[0021] As attached Figure 4 As shown, the lead screw 5 is threaded with an anti-loosening nut 54 for fixing the bushing 52. The anti-loosening nut 54 is used to strengthen the fixed connection between the gear 51 and the lead screw 5.

[0022] The bottom of the fixed base 2 is provided with a fixing hole 23, and the base 1 is provided with a positioning hole 13. The positioning hole 13 and the fixing hole 23 are fixedly connected by a positioning pin 14. When installing the fixture body, the positioning pin 14 is inserted into the positioning hole 13 on the base 1, and then the fixing hole 23 at the bottom of the fixed base 2 is fitted onto the positioning pin 14, so as to achieve precise positioning and fixation of the fixed base 2 and the base 1. This positioning method can ensure that the installation position of the fixed base 2 on the base 1 is accurate and avoids processing errors caused by installation deviations. At the same time, the fixed connection method of the positioning pin 14 also enhances the overall structural stability of the fixture, so that the fixture can withstand greater clamping force and cutting force during processing, ensuring the smooth progress of the processing.

[0023] The fixed base 2 adopts a split structure, consisting of an upper shaft seat 24 and a lower shaft seat 25. An axial limiting groove 21 is located between the upper shaft seat 24 and the lower shaft seat 25, used to install a limiting ring 22. The upper shaft seat 24 and the lower shaft seat 25 are fixedly connected by bolts. The upper shaft seat 24 and the lower shaft seat 25 are fixedly connected by bolts to form an integral structure, providing more efficient and reliable fixture support for CNC machining. This split design makes the assembly and maintenance of the fixed base 2 more convenient, while the position design of the axial limiting groove 21 ensures the stable installation and rotation of the limiting ring 22, ensuring that the lead screw 5 can perform workpiece clamping and releasing operations.

[0024] A lifting mechanism 6 is provided between the linkage rack 12 and the transverse slide groove 11. The lifting mechanism 6 is used to adjust the height of the rack. The lifting mechanism 6 can be a threaded lifting device, a hydraulic lifting device, or other similar mechanical structure, used to adjust the height position of the linkage rack 12 in the transverse slide groove 11. By adjusting the lifting mechanism 6, the meshing height between the linkage rack 12 and the gear 51 can be changed, or a clutch operation can be quickly achieved, thereby realizing the adjustment of the linkage operation of the lead screw 5. The design of the lifting mechanism 6 also makes the installation and disassembly of the linkage rack 12 more convenient. If the rack or gear is worn or damaged, the components can be quickly adjusted or replaced through the lifting mechanism 6, reducing equipment downtime and improving equipment maintainability.

[0025] Preferably, the design of the lifting mechanism 6 further refines the rack height adjustment function. The lifting mechanism 6 includes an inclined surface 61 and an inclined slider 62. The inclined slider 62 is installed in the transverse slide groove 11, and a linkage rack 12 is placed above the inclined slider 62. The bottom of the linkage rack 12 is provided with an inclined surface 61 that cooperates with the inclined slider 62. The transverse slide groove 11 is provided with a side hole, and a push rod 63 for pushing the inclined slider 62 is threadedly connected to the side hole. By rotating the push rod 63, the push rod pushes the inclined slider 62 to move in the left and right direction within the transverse slide groove 11. Since the inclined slider 62 and the linkage rack 12 are engaged by the inclined surface, the horizontal movement of the inclined slider 62 is converted into the vertical movement of the linkage rack 12, thereby realizing the adjustment of the rack height. The lifting mechanism 6 is simple in design and easy to operate. The operator only needs to rotate the push rod 63 to adjust the rack height, without complicated tools or operating steps, further simplifying the operation process and reducing labor intensity.

[0026] Although the present invention has been illustrated and described with reference to preferred embodiments, those skilled in the art should understand that various changes in form and detail are possible within the scope of the claims.

Claims

1. A CNC machining fixture, comprising a base (1) and a plurality of fixture bodies arranged side by side on the base (1), the fixture body comprising a fixed seat (2), a movable seat (3), a guide rail (4) and a lead screw (5), wherein the guide rail (4) and the lead screw (5) are arranged parallel to each other, and the movable seat (3) is slidably disposed on the guide rail (4), characterized in that: The fixed seat (2) and guide rail (4) are fixedly installed on the base (1), the fixed seat (2) and movable seat (3) are respectively provided with axial limiting groove (21) and screw hole (31), the axial limiting groove (21) is rotatably installed with limiting ring (22), one end of the lead screw (5) is fixedly connected with the limiting ring (22), the other end is threadedly connected with the screw hole (31), the base (1) is provided with a transverse sliding slot (11), the transverse sliding slot (11) and the lead screw (5) are perpendicular to each other, the transverse sliding slot (11) is slidably installed with the linkage rack (12), the linkage rack (12) is engagedly connected with the gear (51), and the gear (51) and the lead screw (5) are detachably fixedly connected.

2. The fixture for CNC machining according to claim 1, characterized in that: The gear (51) is provided with an axle hole, the lead screw (5) passes through the axle hole, one end of the axle hole is provided with a shaft sleeve (52), and the shaft sleeve (52) is provided with a locking screw (53) for fixing the lead screw (5).

3. The fixture for CNC machining according to claim 2, characterized in that: The lead screw (5) is threadedly connected with a lock nut (54) for fixing the shaft sleeve (52).

4. The fixture for CNC machining according to claim 1, characterized in that: The bottom of the fixed seat (2) is provided with a fixed hole (23), and the base (1) is provided with a positioning hole (13), and the positioning hole (13) and the fixed hole (23) are fixedly connected through a positioning pin (14).

5. The fixture for CNC machining according to claim 4, characterized in that: The fixed seat (2) is composed of an upper shaft seat (24) and a lower shaft seat (25), and the axial limiting groove (21) is located between the upper shaft seat (24) and the lower shaft seat (25), and the upper shaft seat (24) and the lower shaft seat (25) are boltedly connected.

6. The fixture for CNC machining according to claim 1, characterized in that: The linkage rack (12) and the transverse sliding slot (11) are provided with a lifting mechanism (6).

7. The fixture for CNC machining according to claim 6, characterized in that: The lifting mechanism (6) comprises a slope (61) and an inclined sliding block (62), the inclined sliding block (62) is installed in the transverse sliding slot (11), the linkage rack (12) is placed above the inclined sliding block (62), the bottom of the linkage rack (12) is provided with a slope (61) matched with the inclined sliding block (62), the transverse sliding slot (11) is provided with a side hole, and a top rod (63) for pushing the inclined sliding block (62) to move is threadedly connected on the side hole.

Images