Computerized numerical control (CNC) tool clamp stable in clamping

Abstract

The utility model discloses a CNC work fixture stable in clamping, which comprises a bottom plate fixedly arranged on an objective table of a CNC machining center through bolts, a plurality of round holes with cross-shaped cross sections are formed in the bottom plate in a rectangular array mode, positioning assemblies are arranged in the round holes, and exhaust mechanisms are arranged on the bottom sides of the round holes. The positioning assembly comprises a piston rod, and the bottom of the piston rod is inserted into the corresponding round hole and makes contact with the inner wall of the corresponding round hole. When the improved CNC tool clamp is used, an operator directly places a workpiece on the bottom plate, then the exhaust mechanism exhausts a specific amount of gas from the connecting holes, and a stable negative pressure cavity is formed in the connecting hole in the bottom side of the workpiece, so that the workpiece is stably adsorbed and fixed to the bottom plate, the fixing effect is stable, no foreign object exists on the workpiece, and the work efficiency is improved. The machining operation of the side of the workpiece cannot be affected, secondary machining can be conducted without adjusting the clamping and fixing position of the workpiece, and the machining efficiency of the workpiece is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of CNC tooling fixtures, in particular to a CNC tooling fixture with firm clamping. Background Technique

[0002] A CNC machining center is a machine tool integrating computer numerical control technology. It controls parameters such as the movement trajectory, cutting speed, and feed rate of the machine tool through a pre-programmed program, and automatically completes various machining tasks such as milling, drilling, tapping, and boring of workpieces. During the use of a CNC machining center, workpieces are generally clamped and fixed by tooling fixtures.

[0003] Most of the existing CNC tooling fixtures complete the clamping and positioning of workpieces through the clamping and fixing of clamping blocks or clamping plates. However, when machining the side positions of workpieces, the presence of clamping blocks or clamping plates may affect the machining operation of workpieces, which requires operators to adjust the clamping and fixing positions of workpieces for secondary machining, reducing the machining efficiency of workpieces. Content of the Utility Model

[0004] The purpose of the utility model is to provide a CNC tooling fixture with firm clamping to facilitate solving the problems raised in the above background technique.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A CNC tooling fixture with firm clamping includes a bottom plate fixedly installed on the loading platform of a CNC machining center through bolts. A plurality of circular holes with a cross-sectional shape of a cross are arranged in a rectangular array on the bottom plate. A positioning component is arranged in the circular holes, and an exhaust mechanism is arranged at the bottom sides of the plurality of circular holes.

[0006] The positioning component includes a piston rod. The bottom of the piston rod is inserted into the corresponding circular hole and contacts the inner wall of the corresponding circular hole. A connection hole is opened at the axial center position of the piston rod. A sealing mechanism is arranged at the top of the piston rod. A plugging mechanism is arranged in the connection hole. A detection mechanism is arranged at the bottom side of the piston rod.

[0007] Preferably, the exhaust mechanism includes an electric control three-way valve. A diversion groove is opened in the bottom plate, and the diversion groove is located at the bottom ends of the plurality of circular holes. The inside of the diversion groove is communicated with the inside of the circular holes. The electric control three-way valve is arranged at the middle position on the left side of the bottom plate, and the air inlet end of the electric control three-way valve is inserted into the diversion groove and fixedly connected to the bottom plate.

[0008] Preferably, a spring is arranged at the bottom side of the piston rod, and the two ends of the spring are respectively fixedly connected to the corresponding piston rod and the inner wall of the corresponding circular hole.

[0009] Preferably, the plugging mechanism includes a spherical block disposed in the corresponding connection hole. A plurality of limiting plates are arranged in a circumferential array on the outer peripheral side of the spherical block, and the outer peripheral wall of the spherical block is in contact with the corresponding limiting plates. A magnetic ring is fixedly installed between the plurality of limiting plates, and the magnetic ring is located at the top of the corresponding spherical block. The spherical block is made of a magnetic material.

[0010] Preferably, the inner wall of the bottom opening of the connection hole is arranged in an arc shape, and a soft pad is fixedly installed on the inner wall of the bottom opening of the connection hole.

[0011] Preferably, the detection mechanism includes a pressure sensor disposed at the central position below the corresponding connection hole, and the detection end of the pressure sensor is inserted into the inner hole of the corresponding soft ring.

[0012] Preferably, the pressure sensor is in clearance fit with the inner wall of the bottom opening of the corresponding connection hole. Two connecting rods are oppositely arranged between the pressure sensor and the inner wall of the flow guiding groove, and both ends of each connecting rod are fixedly connected to the corresponding pressure sensor and the inner wall of the flow guiding groove respectively.

[0013] Preferably, the sealing mechanism includes a soft ring. An annular groove is formed at the top end of the piston rod, and the bottom of the soft ring is inserted into the corresponding annular groove and is in contact with the inner wall of the corresponding annular groove. The inside of the soft ring is hollow and filled with air.

[0014] The utility model has at least the following beneficial effects:

[0015] 1. When the improved CNC tooling fixture is in use, the operator directly places the workpiece on the bottom plate. Subsequently, the exhaust mechanism extracts a specific amount of gas from a plurality of connection holes, and a stable negative pressure cavity is formed in the connection holes on the bottom side of the workpiece, thereby stably adsorbing and fixing the workpiece on the bottom plate. The fixing effect is stable, and there are no foreign objects on the workpiece, which will not affect the machining operation on the side of the workpiece. There is no need to adjust the clamping and fixing position of the workpiece for secondary machining, improving the machining efficiency of the workpiece;

[0016] 2. When the operator places the workpiece on the bottom plate as described above, due to the pressing of the workpiece on the piston rod, the piston rod at the bottom side of the workpiece retracts into the round hole, and the sealing mechanism automatically plugs the gap between the piston rod and the bottom side of the workpiece. Subsequently, the exhaust mechanism extracts a specific amount of gas from a plurality of round holes. At this time, the plugging mechanism automatically plugs the gap at the bottom opening of the connection hole on the outer peripheral side of the workpiece. At the same time, the control computer of the CNC machining center automatically determines the position of the workpiece on the bottom plate through the detection mechanism, without the need for other operations by the operator. The device has a high degree of automation, and the device can perform the limit fixation of various workpieces, expanding the application range of the device. Description of the Drawings

[0017] To more clearly illustrate the technical solutions of the embodiments of the present utility model, the following will briefly introduce the drawings required for use in the description of the embodiments. Obviously, the drawings in the following description are some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0018] Figure 1 It is a schematic diagram of the whole of the present utility model;

[0019] Figure 2 It is a schematic diagram of the internal structure of the bottom plate of the present utility model;

[0020] Figure 3 For the present utility model Figure 2 An enlarged view of the structure at position A in it;

[0021] Figure 4 It is a schematic diagram of the overall structure of the piston rod of the present utility model;

[0022] Figure 5 It is a schematic diagram of the internal structure of the piston rod of the present utility model;

[0023] Figure 6 It is a front view of the internal structure of the piston rod of the present utility model.

[0024] In the figure: 1. Bottom plate; 2. Round hole; 3. Positioning assembly; 31. Piston rod; 32. Sealing mechanism; 321. Spherical block; 322. Limiting plate; 323. Magnetic ring; 324. Soft pad; 33. Detection mechanism; 331. Pressure sensor; 332. Connecting rod; 34. Sealing mechanism; 341. Annular groove; 342. Soft ring; 35. Connecting hole; 4. Exhaust mechanism; 41. Flow guide groove; 42. Electric control three-way valve; 5. Spring. Specific embodiments

[0025] In order to make the technical solutions and advantages of the present utility model clearer and more understandable, the following further details the present utility model in conjunction with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present utility model and are not used to limit the present utility model.

[0026] The present utility model provides a technical solution: Referring to Figure 1 - Figure 6 , a CNC work fixture with stable clamping disclosed by the present utility model includes a bottom plate 1 fixedly installed on the load platform of a CNC machining center through bolts. A number of round holes 2 with a cross-sectional shape of a cross are arranged in a rectangular array on the bottom plate 1. A positioning assembly 3 is arranged in the round holes 2, and an exhaust mechanism 4 is arranged on the bottom sides of a number of round holes 2;

[0027] The positioning component 3 includes a piston rod 31. The bottom of the piston rod 31 is inserted into the corresponding round hole 2 and contacts the inner wall of the corresponding round hole 2. A connection hole 35 is provided at the axial center position of the piston rod 31. A sealing mechanism 34 is provided at the top of the piston rod 31. A plugging mechanism 32 is provided in the connection hole 35. A detection mechanism 33 is provided at the bottom side of the piston rod 31.

[0028] In this embodiment, when the improved CNC tooling fixture is in use, the operator directly places the workpiece on the bottom plate 1. At this time, due to the pressing of the workpiece on the piston rod 31, the piston rod 31 at the bottom side of the workpiece retracts into the round hole 2, and the sealing mechanism 34 automatically plugs the gap between the piston rod 31 and the bottom side of the workpiece. Subsequently, the exhaust mechanism 4 extracts a specific amount of gas from several round holes 2. At this time, the plugging mechanism 32 automatically plugs the bottom opening gap of the connection hole 35 on the outer periphery of the workpiece. At the same time, the control computer of the CNC machining center automatically determines the position of the workpiece on the bottom plate 1 through the detection mechanism 33. At the same time, a stable negative pressure cavity is formed in the connection hole 35, and the workpiece is stably adsorbed and fixed on the bottom plate 1 through the adsorption force of the negative pressure cavity. The fixing effect is stable, and there are no foreign objects on the workpiece, which will not affect the machining operation on the side of the workpiece. There is no need to adjust the clamping and fixing position of the workpiece for secondary machining, improving the machining efficiency of the workpiece.

[0029] In a further preferred embodiment of the present utility model, as Figure 1 - Figure 3 shown, the exhaust mechanism 4 includes an electric control three-way valve 42. A diversion groove 41 is provided in the bottom plate 1, and the diversion groove 41 is located at the bottom ends of several round holes 2. The inside of the diversion groove 41 is communicated with the inside of the round holes 2. The electric control three-way valve 42 is provided at the middle position on the left side of the bottom plate 1, and the air inlet end of the electric control three-way valve 42 is inserted into the diversion groove 41 and fixedly connected to the bottom plate 1;

[0030] In this embodiment, after the workpiece is processed, the electric control three-way valve 42 is activated, so that the inside of the diversion groove 41 is communicated with the outside. At this time, the outside air flows into the diversion groove 41 from the electric control three-way valve 42, automatically relieving the negative pressure state in the diversion groove 41. At this time, the operator can directly remove the workpiece from the bottom plate 1, facilitating the workpiece taking operation;

[0031] It should be noted that the exhaust end of the above-mentioned electric control three-way valve 42 is connected to the air inlet end of an external air pump through a connecting pipe.

[0032] In a further preferred embodiment of the present utility model, as Figure 2 and Figure 3 shown, a spring 5 is provided at the bottom side of the piston rod 31, and both ends of the spring 5 are fixedly connected to the corresponding piston rod 31 and the inner wall of the corresponding round hole 2;

[0033] In this embodiment, after the operator removes the workpiece from the bottom plate 1, due to the pushing of the spring 5 on the piston rod 31, the piston rod 31 retracted into the round hole 2 automatically pops out of the round hole 2, so as to facilitate the subsequent fixing of the workpiece.

[0034] In a further preferred embodiment of the present utility model, as Figure 4 and Figure 6 shown, the plugging mechanism 32 includes a spherical block 321. The spherical block 321 is arranged in the corresponding connection hole 35. A plurality of limiting plates 322 are arranged in a circumferential array on the outer peripheral side of the spherical block 321. And at the joint of the outer peripheral wall of the spherical block 321 and the corresponding limiting plates 322, a magnetic ring 323 is fixedly installed between the plurality of limiting plates 322. And the magnetic ring 323 is located at the top of the corresponding spherical block 321. The spherical block 321 is made of a magnetic material;

[0035] In this embodiment, when extracting gas from the connection hole 35, the operator starts the air pump to run for a period of time. At the same time, the electric control three-way valve 42 is started to control the communication between the diversion groove 41 and the air inlet end of the air pump, and the air pump is started to extract a certain amount of gas from the diversion groove 41;

[0036] As the gas in the diversion groove 41 is lost, a negative pressure cavity is continuously formed in the diversion groove 41. Due to the plugging of the top opening of the connection hole 35 at the bottom side of the workpiece, the outside gas will not flow into the diversion groove 41 from the round hole 2 at the bottom side of the workpiece. And at the position of the piston rod 31 on the outer peripheral side of the workpiece, the outside gas continuously passes through the connection hole 35 and the round hole 2 and flows into the diversion groove 41 to supplement the lost gas in the diversion groove 41;

[0037] The gas flowing in the connection hole 35 can exert a thrust on the spherical block 321. And due to the constraint and limitation of the spherical block 321 by the limiting plates 322, the bottom of the spherical block 321 is inserted into the soft ring 342, automatically completing the plugging of the bottom opening of the connection hole 35 on the outer peripheral side of the workpiece. Finally, a relatively closed space is formed in the diversion groove 41. And as the gas in the diversion groove 41 is lost, the intensity of the negative pressure cavity in the diversion groove 41 gradually increases. At this time, a corresponding negative pressure cavity is synchronously formed in the connection hole 35 at the bottom side of the workpiece, and then the workpiece is adsorbed and fixed on the bottom plate 1 through the negative pressure cavity in the connection hole 35.

[0038] In a further preferred embodiment of the present utility model, as Figure 6 shown, the inner ring wall of the bottom opening of the connection hole 35 is arranged in an arc shape, and a soft pad 324 is fixedly installed on the inner wall of the bottom opening of the connection hole 35;

[0039] In this embodiment, after the bottom of the spherical block 321 is inserted into the round hole 2, since the spherical block 321 abuts against the soft ring 342 and the inner wall of the bottom opening of the connecting hole 35, the soft ring 342 is closely attached to the outer wall of the spherical block 321, so as to enhance the sealing effect of the spherical block 321 on the bottom opening of the connecting hole 35.

[0040] In a further preferred embodiment of the present utility model, as Figure 5 and Figure 6 shown, the detection mechanism 33 includes a pressure sensor 331, the pressure sensor 331 is arranged at the central position corresponding to the lower part of the connecting hole 35, and the detection end of the pressure sensor 331 is inserted into the inner hole of the corresponding soft ring 342;

[0041] In this embodiment, during the process of inserting the bottom of the spherical block 321 into the soft ring 342, due to the mutual abutment between the spherical block 321 and the detection end of the pressure sensor 331, a pressure can be applied to the pressure sensor 331, so that the pressure sensor 331 on the outer peripheral side of the workpiece detects a specific pressure. At this time, the control host of the CNC machining center can obtain the position of the workpiece on the bottom plate 1 according to the distribution of the pressure sensors 331 that do not detect pressure, without other operations by the operator.

[0042] In a further preferred embodiment of the present utility model, as Figure 6 shown, the pressure sensor 331 is in clearance fit with the inner wall of the bottom opening of the corresponding connecting hole 35. Two connecting rods 332 are oppositely arranged between the pressure sensor 331 and the inner wall of the diversion groove 41, and both ends of each connecting rod 332 are fixedly connected to the corresponding pressure sensor 331 and the inner wall of the diversion groove 41 respectively;

[0043] In this embodiment, the arrangement of the connecting rods 332 enables a specific size of gap to always exist between the pressure sensor 331 and the diversion groove 41, so that the arrangement of the pressure sensor 331 does not affect the gas exchange between the round hole 2 and the diversion groove 41.

[0044] In a further preferred embodiment of the present utility model, as Figure 5 and Figure 6 shown, the sealing mechanism 34 includes a soft ring 342. An annular groove 341 is formed at the top end of the piston rod 31, and the bottom of the soft ring 342 is inserted into the corresponding annular groove 341 and contacts the inner wall of the corresponding annular groove 341. The inside of the soft ring 342 is hollow and filled with air;

[0045] In this embodiment, after the piston rod 31 retracts into the round hole 2, due to the pushing of the spring 5 on the piston rod 31 and the pressing of the workpiece on the soft ring 342, the soft ring 342 undergoes corresponding shrinkage deformation according to the contact position of the workpiece. At this time, the soft ring 342 closely adheres to the bottom side of the workpiece, automatically sealing the gap between the top end of the piston rod 31 and the workpiece.

[0046] Working principle: When using this improved CNC fixture, the operator first places the workpiece on the bottom plate 1. Due to the pressing of the workpiece on the soft ring 342, the soft ring 342 undergoes corresponding shrinkage deformation according to the contact position of the workpiece until the top end of the piston rod 31 abuts against the workpiece. At this time, the soft ring 342 closely adheres to the bottom side of the workpiece, automatically sealing the gap between the top end of the piston rod 31 and the workpiece.

[0047] After the above workpiece abuts against the piston rod 31, due to the pressing of the workpiece on the piston rod 31, the corresponding position of the piston rod 31 retracts into the round hole 2 until the bottom side of the workpiece abuts against the top side of the bottom plate 1, and the workpiece stops moving downward.

[0048] After the above workpiece is placed, the operator starts the air pump to run for a specific time. At the same time, the electric control three-way valve 42 starts to control the communication between the diversion groove 41 and the air inlet end of the air pump, and the air pump is started to extract a certain amount of gas from the diversion groove 41.

[0049] As the gas in the diversion groove 41 is lost, a negative pressure cavity is continuously formed in the diversion groove 41. Due to the sealing of the top opening of the connection hole 35 at the bottom side of the workpiece, the outside gas will not flow into the diversion groove 41 from the round hole 2 at the bottom side of the workpiece. However, at the position of the piston rod 31 on the outer peripheral side of the workpiece, the outside gas continuously flows through the connection hole 35 and the round hole 2 into the diversion groove 41 to supplement the lost gas in the diversion groove 41.

[0050] The gas flowing in the connection hole 35 can exert a thrust on the spherical block 321. And due to the constraint and limitation of the limiting plate 322 on the spherical block 321, the bottom of the spherical block 321 is inserted into the soft ring 342. At this time, the spherical block 321 abuts against the inner wall of the bottom opening of the soft ring 342 and the connection hole 35, so that the soft ring 342 closely adheres to the outer wall of the spherical block 321, automatically completing the sealing of the bottom opening of the connection hole 35 on the outer peripheral side of the workpiece. Finally, a relatively closed space is formed in the diversion groove 41. And as the gas in the diversion groove 41 is lost, the intensity of the negative pressure cavity in the diversion groove 41 gradually increases. At this time, a corresponding negative pressure cavity is synchronously formed in the connection hole 35 at the bottom side of the workpiece, and then the workpiece is adsorbed and fixed on the bottom plate 1 through the negative pressure cavity in the connection hole 35.

[0051] It should be noted that after the air pump extracts a specific amount of gas from the guide groove 41, the electric-controlled three-way valve 42 is closed, so that a stable negative pressure cavity is formed in the guide groove 41, so that the negative pressure adsorption force on the workpiece remains stable;

[0052] During the process of inserting the bottom of the spherical block 321 into the soft ring 342, due to the mutual interference between the spherical block 321 and the detection end of the pressure sensor 331, a pressure can be applied to the pressure sensor 331, so that the pressure sensor 331 on the outer peripheral side of the workpiece detects a specific pressure. At this time, the control host of the CNC machining center can obtain the position of the workpiece on the bottom plate 1 according to the distribution of the pressure sensors 331 that do not detect pressure;

[0053] After the processing of the above-mentioned workpiece is completed, the electrically controlled three-way valve 42 is started, so that the inside of the guide groove 41 is connected with the outside. At this time, the outside air flows into the guide groove 41 from the electrically controlled three-way valve 42, and the negative pressure state in the guide groove 41 is released. At this time, the operator can directly remove the workpiece from the bottom plate 1. After the workpiece is removed, due to the push of the spring 5 on the piston rod 31, the piston rod 31 retracted into the circular hole 2 automatically pops out of the circular hole 2 to facilitate the subsequent fixation of the workpiece.

[0054] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A CNC workholding fixture with stable clamping, comprising a bottom plate (1) fixedly installed on the worktable of a CNC machining center by bolts, characterized in that: A number of circular holes (2) with a cross-sectional shape of a cross are arranged in a rectangular array on the bottom plate (1). A positioning component (3) is provided in the circular holes (2), and an exhaust mechanism (4) is provided at the bottom sides of a number of the circular holes (2). The positioning component (3) includes a piston rod (31). The bottom of the piston rod (31) is inserted into the corresponding circular hole (2) and contacts the inner wall of the corresponding circular hole (2). A connection hole (35) is provided at the axial center position of the piston rod (31). A sealing mechanism (34) is provided at the top of the piston rod (31). A plugging mechanism (32) is provided in the connection hole (35). A detection mechanism (33) is provided at the bottom side of the piston rod (31).

2. The CNC workholding fixture with stable clamping according to claim 1, characterized in that: The exhaust mechanism (4) includes an electrically controlled three-way valve (42). A diversion groove (41) is provided in the bottom plate (1), and the diversion groove (41) is located at the bottom ends of a number of circular holes (2). The inside of the diversion groove (41) is communicated with the inside of the circular holes (2). The electrically controlled three-way valve (42) is provided at the middle position on the left side of the bottom plate (1), and the air inlet end of the electrically controlled three-way valve (42) is inserted into the diversion groove (41) and fixedly connected to the bottom plate (1).

3. The CNC tooling fixture with stable clamping according to claim 2, characterized in that: A spring (5) is provided at the bottom side of the piston rod (31), and the two ends of the spring (5) are respectively fixedly connected to the corresponding piston rod (31) and the inner wall of the corresponding circular hole (2).

4. The CNC workholding fixture with firm clamping according to claim 3, characterized in that: The plugging mechanism (32) includes a spherical block (321). The spherical block (321) is provided in the corresponding connection hole (35). A number of limiting plates (322) are arranged in a circumferential array on the outer peripheral side of the spherical block (321), and the outer peripheral wall of the spherical block (321) contacts the corresponding limiting plates (322). A magnetic ring (323) is fixedly installed between a number of the limiting plates (322), and the magnetic ring (323) is located at the top of the corresponding spherical block (321). The spherical block (321) is made of a magnetic material.

5. The CNC workholding fixture with stable clamping according to claim 4, characterized in that: The inner wall of the bottom opening of the connection hole (35) is arranged in an arc shape, and a soft pad (324) is fixedly installed on the inner wall of the bottom opening of the connection hole (35).

6. The CNC tooling fixture with firm clamping according to claim 5, characterized in that: The detection mechanism (33) includes a pressure sensor (331). The pressure sensor (331) is provided at the central position below the corresponding connection hole (35), and the detection end of the pressure sensor (331) is inserted into the inner hole of the corresponding soft ring (342).

7. The CNC workholding fixture with firm clamping according to claim 6, characterized in that: The pressure sensor (331) is in clearance fit with the inner wall of the bottom opening of the corresponding connection hole (35). Two connecting rods (332) are oppositely arranged between the pressure sensor (331) and the inner wall of the diversion groove (41), and both ends of each connecting rod (332) are respectively fixedly connected to the corresponding pressure sensor (331) and the inner wall of the diversion groove (41).

8. A CNC workholding fixture with stable clamping according to claim 7, characterized in that: The sealing mechanism (34) includes a soft ring (342). An annular groove (341) is provided at the top of the piston rod (31), and the bottom of the soft ring (342) is inserted into the corresponding annular groove (341) and contacts the inner wall of the corresponding annular groove (341). The inside of the soft ring (342) is hollow and filled with air.

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