A numerical control character surrounding machine and a positioning method for a grooving tool

Abstract

The present invention discloses a CNC letter enclosing machine and a slotting knife positioning method, comprising a frame, on which a feeding mechanism, a slotting mechanism, and a bending mechanism are sequentially mounted, wherein the slotting mechanism comprises a slotting mounting plate, a vertical slotting device, a horizontal feeding device, and a slotting component, characterized in that: a knife calibration positioning device is provided on the slotting mounting plate, wherein the knife calibration positioning device comprises a tool setting instrument, wherein the tool setting instrument comprises a tool setting probe, wherein the detection surface of the tool setting probe is in the same plane as or lower than the surface of the slotting mounting plate facing the slotting component, wherein the tool setting instrument is electrically connected to a CNC device and transmits a tool setting position signal to the CNC device. The present invention realizes automatic tool setting by feedback of positioning data by the tool setting instrument in the knife calibration positioning device, and can automatically perform tool setting when the equipment needs to perform tool setting, accurately determine the exact position of the tool tip, ensure more accurate slotting depth of the letter enclosing machine, improve the bending effect of the plate after slotting, and improve the production quality of three-dimensional luminous characters.

Description

Technical Field

[0001] The present invention relates to the field of numerical control machine tools, in particular to a numerical control letter enclosing machine and a slotting knife positioning method. Background Art

[0002] The letter-bending machine, also known as the letter-bending machine, is a CNC machine tool that is used to slot and bend long metal strips into the expected curved strips according to the positions set in the electronic drawings read by the letter-bending machine's slotting control program. The bent strips can form the side frames of three-dimensional luminous characters. After being bonded to organic plastic sheets and placed in light-emitting devices, they form three-dimensional luminous characters used for advertising or decoration.

[0003] Among them, the processing of metal strips uses a slotting machine. There are many ways to slot metal strips with a slotting machine. The most common one is to use a slotting knife. The slotting knife can be set as an integral part or as a split part. The split slotting knife generally includes a handle and a tip. The tip is separately mounted on the handle, and the handle is mounted on the transverse feed mechanism. The metal strip is pushed to a predetermined position by the feed mechanism and then fixed. After the slotting knife is pushed forward a specific distance by the transverse feed mechanism, it is pushed up and down by the vertical slotting drive to slot the metal strip. Because the thickness of the metal strip is only about 1 mm and the slotting depth is only a few tens of threads, the slotting knife must be accurately positioned at the zero point or original position during installation. Traditionally, the zero point positioning method is manual assembly. Specifically, the slotting knife is mounted on the transverse feed mechanism and manually pushed until its tip contacts the shim. The surface of the shim is flush with the back of the metal strip, which is the positioning zero point of the feed mechanism. The slotting knife is then fixed with bolts.

[0004] However, the slotting knife will always have a certain degree of displacement during the bolt fixing process. The displacement amplitude is very small, generally only a few dozen threads. However, for metal strips with a thickness of only about 50 threads, an error of a few dozen threads is unacceptable. Therefore, the traditional replacement of the slotting knife requires the operator to manually adjust it to ensure that the final position is relatively accurate, so as to ensure that the slotting depth is basically consistent. This method is time-consuming and labor-intensive, and the error is still large. Generally, the depth error of the slotting knife adjusted manually can be as high as a dozen threads. The error of the slotting depth of a few dozen threads is too large, resulting in a large error in the slotting depth of the current bending machine. The slotting depth is either too deep or too shallow. The bending effect depends largely on the operator's skills and varies greatly.

[0005] Of course, other slotting methods, such as those using rotating milling cutters, also present the same zero-point positioning issues as the slotting cutter. Zero-point positioning determines the accuracy of the slotting depth. The assembly accuracy of the slotting cutters on existing letter-bending or letter-bending machines relies on manual adjustment, which is time-consuming and labor-intensive. The industry needs a letter-bending machine that can automatically adjust and significantly improve zero-point positioning accuracy. Summary of the Invention

[0006] The purpose of the present invention is to overcome the shortcomings of the above-mentioned traditional technology and provide a CNC letter-binding machine and a slotting knife positioning method that can automatically adjust and significantly improve the zero-point positioning accuracy.

[0007] The purpose of the present invention is achieved through the following technical measures:

[0008] A CNC engraving machine comprises a frame, on which a feeding mechanism, a slotting mechanism and a bending mechanism are sequentially mounted, the slotting mechanism comprising a slotting mounting plate, a vertical slotting device, a transverse feeding device and a slotting component, the slotting mounting plate is fixedly mounted on the frame, the vertical slotting device drives the transverse feeding device to move vertically, and the transverse feeding device drives the slotting component to move transversely, characterized in that a tool calibration and positioning device is provided on the slotting mounting plate, the tool calibration and positioning device comprises a tool setting instrument, the tool setting instrument comprises a tool setting probe, the detection surface of the tool setting probe is in the same plane as or lower than the surface of the slotting mounting plate facing the slotting component, the tool setting instrument is electrically connected to a CNC device and transmits a tool setting position signal to the CNC device, the transverse feeding device comprises a slotting return to zero sensing component, the slotting return to zero sensing component is arranged relative to the slotting component, the slotting return to zero sensing component is electrically connected to the CNC device and transmits a slotting component reset signal.

[0009] As a preferred solution, a clamping plate is provided on the slotted mounting plate, and a feeding gap is formed between the slotted mounting plate and the clamping plate to accommodate the passage of the metal strip, and the tool setting probe of the tool setting instrument is located at the upper or lower part of the feeding gap.

[0010] As a preferred solution, the clamping plate includes two clamping plates that are relatively symmetrically arranged, a slotted channel is formed between the two clamping plates, and the tool setting probe of the tool setting instrument is located in the middle of the slotted channel.

[0011] As a preferred solution, the tool calibration and positioning device includes a tool setting mounting frame, the tool setting mounting frame includes a tool setting mounting plate and at least three tool setting mounting pillars, the two ends of the tool setting mounting pillars are respectively fixedly connected to the slotted mounting plate and the tool setting mounting plate, and the tool setting instrument is fixedly mounted on the tool setting mounting plate.

[0012] As a preferred solution, the vertical grooving device includes a vertical mounting plate, a vertical sliding guide rail assembly and a vertical drive. The vertical sliding guide rail assembly includes a vertical guide rail and a vertical slider that are arranged in conjunction with each other. The vertical guide rail is fixedly mounted on the vertical mounting plate. The vertical slider is fixedly connected to the horizontal feeding device. The vertical drive is transmission-connected to the horizontal feeding device.

[0013] As a preferred solution, the transverse feeding device includes a transverse mounting plate, a transverse guide rail assembly and a transverse drive, the transverse mounting plate is fixedly mounted on the vertical slider, the transverse sliding guide rail assembly includes a cooperating transverse guide rail and a transverse slider, the transverse guide rail is fixedly mounted on the transverse mounting plate, the transverse slider is fixedly connected to the slotted component, and the transverse drive is transmission-connected to the slotted component.

[0014] As a preferred solution, the lateral drive includes a lateral stepping motor and a screw that is transmission-connected to the lateral stepping motor. The screw is installed on the lateral mounting plate through a screw support. One end of the screw is transmission-connected to a screw seat, and the screw seat is fixedly connected to the slotted component.

[0015] As a preferred solution, the slotting component includes a slotting knife mounting plate, a slotting knife mounting seat and a slotting knife, the slotting knife is provided with a knife tip and a knife handle which are integrally or separately arranged, the knife handle of the slotting knife is fixedly mounted on the slotting knife mounting seat, the slotting knife mounting seat is fixedly mounted on the slotting knife mounting plate, the slotting knife mounting plate is fixedly mounted on the transverse slider, and the slotting knife mounting plate is fixedly connected to the screw seat.

[0016] As a preferred solution, the slotted return-to-zero sensing component is fixedly mounted on a transverse mounting plate or a lead screw support.

[0017] The above-mentioned slotting knife positioning method of the CNC letter-making machine is characterized in that it includes the following steps:

[0018] Step 1: Install the slotting tool and tighten it, measure the offset distance L0 between the tool setting probe surface and the slotting mounting plate surface, and set the preset initial distance L1;

[0019] Step 2: The CNC device controls the cross feed device to push the slotting component in the direction away from the tool setting probe until it receives the signal from the slotting zero return sensing component and records the position as the reference zero point;

[0020] Step 3: The CNC device controls the cross feed device to push the slotting component toward the tool setter by a preset initial distance L1 to reach the initial standby position;

[0021] Step 4: The CNC device controls the cross feed device to push the slotted component toward the tool setter and records the position in real time until it receives the distance signal from the tool setter and records the distance between the position and the initial standby position as L2;

[0022] Step 5: Calculate the zero point position of the slotted component: L=L1+L2-L0;

[0023] Stores the calculated slotted component position information.

[0024] Among them, after step 2, it also includes: the vertical slotting device drives the horizontal feeding device to move vertically to a position where the slotting knife and the tool setting instrument are facing each other.

[0025] The preset initial distance L1 is determined by the distance of the slotting knife in the normal standby state.

[0026] Due to the adoption of the above technical solution, compared with the prior art, the advantages of the present invention are:

[0027] The present invention discloses a CNC letter enclosing machine, which has an automatic tool setting structure. The automatic tool setting structure realizes automatic tool setting by feedback of positioning data by a tool setting instrument in a tool calibration and positioning device. The automatic tool setting structure can automatically set the tool when the slotting knife of the equipment is replaced or the knife tip is worn after being used for a period of time, so as to determine the accurate position of the knife tip, ensure that the slotting depth of the letter enclosing machine is more accurate, improve the bending effect of the plate after slotting, improve the production quality of three-dimensional luminous characters, and improve working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Attachment Figure 1 The utility model is a schematic diagram of the overall structure of a numerical control letter-binding machine of the present invention.

[0029] Attachment Figure 2 It is an enlarged structural schematic diagram of a slotting mechanism in a CNC letter-binding machine of the present invention.

[0030] Attachment Figure 3 It is attached Figure 2 Schematic diagram of the front structure of the middle slotting mechanism.

[0031] Attachment Figure 4 It is attached Figure 2 Schematic diagram of the left side structure of the middle slotting mechanism.

[0032] Attachment Figure 5 It is attached Figure 2 A partial cross-sectional view of the center slotting mechanism with some components removed. DETAILED DESCRIPTION

[0033] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0034] Example 1: As shown in the attached Figures 1 to 5As shown, a CNC encircling machine includes a frame 1, on which a feeding mechanism 2, a slotting mechanism 3 and a bending mechanism 4 are sequentially mounted. The frame 1, the feeding mechanism 2 and the bending mechanism 4 are all well-known technologies and are not described in detail. The slotting mechanism 3 includes a slotting mounting plate 31, a vertical slotting device, a transverse feeding device and a slotting component. The slotting mounting plate 31 is fixedly mounted on the frame 1. The vertical slotting device drives the transverse feeding device to move vertically, and the transverse feeding device drives the slotting component to move transversely. The slotting mounting plate 31 is provided with The tool calibration and positioning device includes a tool setting instrument 33, which includes a tool setting probe. The detection surface of the tool setting probe is in the same plane as or lower than the surface of the slotting mounting plate 31 facing the slotting component. The tool setting instrument 33 is electrically connected to a numerical control device and transmits a tool setting position signal to the numerical control device. The transverse feed device includes a slotting zero return sensing component, which is arranged opposite to the slotting component, electrically connected to the numerical control device, and transmits a slotting component reset signal. The slotting zero return sensing component can be a zero return sensing switch or a photoelectric switch.

[0035] The slotted mounting plate 31 is provided with two relatively symmetrically arranged clamping plates 32, and a feeding gap for accommodating the passage of metal strips is formed between the slotted mounting plate 31 and the two clamping plates 32. The tool setting probe of the tool setting instrument 33 is located at the upper or lower part of the feeding gap.

[0036] A slotting channel for accommodating a slotting component for cutting a metal strip is formed between the two clamping plates 32 , and a tool setting probe of the tool setting instrument 33 is located in the middle of the slotting channel.

[0037] The tool calibration and positioning device includes a tool setting mounting frame 36, and the tool setting mounting frame 36 includes a tool setting mounting plate 361 and at least three tool setting mounting pillars 362. The two ends of the tool setting mounting pillars 362 are respectively fixedly connected to the slotted mounting plate 31 and the tool setting mounting plate 361, and the tool setting instrument 33 is fixedly mounted on the tool setting mounting plate 361.

[0038] The vertical slotting device includes a vertical mounting plate 351, a vertical sliding guide assembly, and a vertical drive 352. The vertical sliding guide assembly includes a cooperating vertical guide rail 353 and a vertical slider 354. The vertical guide rail 353 is fixedly mounted on the vertical mounting plate 351. The vertical slider 354 is fixedly connected to the transverse feed device. The vertical drive 352 is in transmission connection with the transverse feed device. In this embodiment, the vertical drive 352 uses a stepper motor, but can also use a pneumatic cylinder or oil cylinder drive component.

[0039] The transverse feeding device includes a transverse mounting plate 371, a transverse guide rail assembly and a transverse drive. The transverse mounting plate 371 is fixedly mounted on the vertical slider 354. The transverse sliding guide rail assembly includes a cooperating transverse guide rail 379 and a transverse slider 378. The transverse guide rail 379 is fixedly mounted on the transverse mounting plate 371. The transverse slider 378 is fixedly connected to the slotted component. The transverse drive is transmission-connected to the slotted component.

[0040] The lateral drive includes a lateral stepping motor 372 and a screw 373 that is transmission-connected to the lateral stepping motor 372. The screw 373 is mounted on the lateral mounting plate 371 through a screw support 374. One end of the screw 373 is transmission-connected to a screw seat 375, and the screw seat 375 is fixedly connected to the slotted component.

[0041] The slotting component includes a slotting knife mounting plate 376, a slotting knife mounting seat 377 and a slotting knife 34. The slotting knife 34 is provided with a separately set knife tip and a knife handle. The knife tip is fixedly mounted on the end of the knife handle facing the slotting mounting plate 371. The knife tip and the knife handle can also be set as one piece. The knife handle of the slotting knife 34 is fixedly mounted on the slotting knife mounting seat 377. The slotting knife mounting seat 377 is composed of two slotting knife mounting blocks arranged relative to each other. The slotting knife mounting seat 377 is fixedly mounted on the slotting knife mounting plate 376. The slotting knife mounting plate 376 is fixedly mounted on the horizontal slider 378. The slotting knife mounting plate 376 is fixedly connected to the screw seat 375.

[0042] The slotting zero return sensing component 38 is fixedly mounted on the transverse mounting plate 371 or can be mounted on the screw support. The slotting zero return sensing component 38 is arranged relative to the slotting knife mounting plate 376 or other components fixedly mounted thereon, and can be triggered by the zero return action of the slotting component.

[0043] Example 2: The slotting knife positioning method of the CNC letter machine in the above-mentioned Example 1 comprises the following steps:

[0044] Step 1: Install the slotting tool and tighten it, measure the offset distance L0 between the tool setting probe surface and the slotting mounting plate surface, and set the preset initial distance L1;

[0045] Step 2: The CNC device controls the cross feed device to push the slotting component in the direction away from the tool setting probe until it receives the signal from the slotting zero return sensing component and records the position as the reference zero point;

[0046] Step 3: The CNC device controls the cross feed device to push the slotting component toward the tool setter by a preset initial distance L1 to reach the initial standby position;

[0047] Step 4: The CNC device controls the cross feed device to push the slotted component toward the tool setter and records the position in real time until it receives the distance signal from the tool setter and records the distance between the position and the initial standby position as L2;

[0048] Step 5: Calculate the zero point position of the slotted component: L=L1+L2-L0;

[0049] Stores the calculated slotted component position information.

[0050] Among them, after step 2, it also includes: the vertical slotting device drives the horizontal feeding device to move vertically to a position where the slotting knife and the tool setting instrument are facing each other.

[0051] The preset initial distance L1 is determined by the distance of the slotting knife in the normal standby state.

[0052] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0053] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for positioning a slotting knife of a CNC letter-making machine, characterized in that: The camming mechanism is a device for adjusting the position of the tool and the positioning device, and the camming mechanism is a device for adjusting the position of the tool and the positioning device, and the camming mechanism is a device for adjusting the position of the tool and the positioning device. The camming mechanism is a device for adjusting the position of the tool and the positioning device, and the camming mechanism is a device for adjusting the position of the tool and the positioning device. The camming mechanism is a device for adjusting the position of the tool and the positioning device, and the camming mechanism is a device for adjusting the position of the tool and the positioning device. The slotting knife positioning method of the numerical control letter-making machine comprises the following steps: Step 1: Install the slotting tool and tighten it, measure the offset distance L0 between the tool setting probe surface and the slotting mounting plate surface, and set the preset initial distance L1; Step 2: The CNC device controls the cross feed device to push the slotting component in the direction away from the tool setting probe until it receives the signal from the slotting zero return sensing component and records the position as the reference zero point; Step 3: The CNC device controls the cross feed device to push the slotting component toward the tool setter by a preset initial distance L1 to reach the initial standby position; Step 4: The CNC device controls the cross feed device to push the slotted component toward the tool setter and records the position in real time until it receives the distance signal from the tool setter and records the distance between the position and the initial standby position as L2; Step 5: Calculate the zero point position of the slotted component: L=L1+L2-L0; Stores the calculated slotted component position information.

2. A slotting knife positioning method for a CNC letter-making machine according to claim 1, characterized in that: A clamping plate is provided on the slotted mounting plate, and a feeding gap for accommodating the passage of metal strips is formed between the slotted mounting plate and the clamping plate. The tool setting probe of the tool setting instrument is located at the upper part or the lower part of the feeding gap.

3. A slotting knife positioning method for a CNC letter-binding machine according to claim 2, characterized in that: The clamping plate includes two clamping plates that are relatively symmetrically arranged, and a slotted channel is formed between the two clamping plates. The tool setting probe of the tool setting instrument is located in the middle of the slotted channel.

4. A slotting knife positioning method for a CNC letter-binding machine according to claim 1, characterized in that: The tool calibration and positioning device includes a tool setting mounting frame, which includes a tool setting mounting plate and at least three tool setting mounting pillars. The two ends of the tool setting mounting pillars are respectively fixedly connected to the slotted mounting plate and the tool setting mounting plate, and the tool setting instrument is fixedly mounted on the tool setting mounting plate.

5. A slotting knife positioning method for a CNC letter-making machine according to claim 1, characterized in that: The vertical grooving device includes a vertical mounting plate, a vertical sliding guide rail assembly and a vertical drive. The vertical sliding guide rail assembly includes a vertical guide rail and a vertical slider that are arranged in conjunction with each other. The vertical guide rail is fixedly mounted on the vertical mounting plate. The vertical slider is fixedly connected to the horizontal feeding device. The vertical drive is transmission-connected to the horizontal feeding device.

6. A slotting knife positioning method for a CNC letter-making machine according to claim 5, characterized in that: The transverse feeding device includes a transverse mounting plate, a transverse guide rail assembly and a transverse drive. The transverse mounting plate is fixedly mounted on the vertical slider. The transverse guide rail assembly includes a cooperating transverse guide rail and a transverse slider. The transverse guide rail is fixedly mounted on the transverse mounting plate. The transverse slider is fixedly connected to the slotted component. The transverse drive is transmission-connected to the slotted component.

7. A slotting knife positioning method for a CNC letter-binding machine according to claim 6, characterized in that: The transverse drive includes a transverse stepping motor and a screw that is transmission-connected to the transverse stepping motor. The screw is mounted on the transverse mounting plate through a screw support. One end of the screw is transmission-connected to a screw seat, and the screw seat is fixedly connected to the slotted component.

8. A slotting knife positioning method for a CNC letter-making machine according to claim 7, characterized in that: The slotting knife is provided with a knife tip and a knife handle which are integrally or separately arranged. The knife handle of the slotting knife is fixedly mounted on the slotting knife mounting seat. The slotting knife mounting seat is fixedly mounted on the slotting knife mounting plate. The slotting knife mounting plate is fixedly mounted on the transverse slider. The slotting knife mounting plate is fixedly connected to the screw seat.

9. A slotting knife positioning method for a CNC letter-binding machine according to claim 7, characterized in that: The slotted return-to-zero sensing component is fixedly mounted on a transverse mounting plate or a lead screw support.

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