Numerical control machine tool machining precision compensation mechanism

Abstract

The utility model discloses a numerical control machine tool machining precision compensation mechanism, which belongs to the technical field of numerical control machine tools and comprises a base, a symmetrical block and a reference block, the symmetrical block and the reference block are both fixed on the base, a compensation rod is arranged on the left side of the symmetrical block in a penetrating manner, and a precision compensation component is arranged between the compensation rod and the outer side of the symmetrical block. A limiting assembly is arranged on the symmetrical block; the precision compensation assembly is used for applying thrust close to one side of the reference block to the compensation rod; the limiting assembly comprises a linear transmission module arranged on the symmetrical block, the output end of the linear transmission module is rotationally connected with a limiting piece, the linear transmission module drives the limiting piece to do linear motion, and the bottom of the limiting piece is an inclined plane; the compensation rod is provided with a limiting groove used for abutting against the inclined face of the bottom of the limiting piece. According to the utility model, a workpiece can be positioned through an elastic precision compensation function and then is physically locked, so that the positioning stability after precision compensation is ensured.

Description

Technical Field

[0001] This utility model relates to the field of CNC machine tool technology, specifically to a CNC machine tool machining accuracy compensation mechanism. Background Technology

[0002] A CNC machine tool is an automated machine tool equipped with a program control system. This control system can logically process programs with control codes or other symbolic instructions. After processing, the CNC device sends out various control signals to control the machine tool's movements and automatically process parts according to the shape and size required by the drawings.

[0003] CNC machine tools inevitably produce certain errors during machining. Existing precision compensation methods are generally divided into error compensation and machining compensation. Error compensation refers to assembling the CNC machine tool with more precise parts and maintaining a high level of precision by controlling the precision of each component. However, this method makes the CNC machine tool too expensive. For non-essential machine tools, machining compensation is often used to achieve the function of precision compensation. This involves using auxiliary structures to fill the precision errors of the CNC machine tool and achieve the effect of precision compensation. For example, in a CNC milling machine, when drilling holes in a workpiece, a clamping and positioning structure is needed to position the workpiece on the machine tool so that the cutting part can be perpendicular to the workpiece for stable machining. If the precision error is large, it will cause the workpiece to deviate during machining. In this case, filler material needs to be added between the positioning structure and the workpiece to achieve the effect of precision compensation.

[0004] Currently, a CNC machine tool precision automatic compensation device disclosed in announcement number CN218696289U achieves more precise positioning of objects through the cooperation of through holes, a first spring, a pressing rod, a clamping block, a first rubber plate, a second rubber plate, a pull ring, a groove, and a second spring. This makes the machining process more accurate and solves the problem that existing CNC machine tools cannot accurately position objects because they often use fixed intervals for positioning.

[0005] However, this patent has certain shortcomings in practical use. Because it uses the elastic combination of a first and second spring, and then uses a first rubber plate to squeeze and position the workpiece, this method is suitable for workpieces with a large mass, making it less prone to displacement during surface processing such as drilling. However, for workpieces with a lower mass, although the elastic limiting method can meet the positioning requirements, the actual positioning stability is poor, and displacement is prone to occur during drilling and other processing. Therefore, its practical applicability is not wide enough. To address these issues, this application provides a CNC machine tool machining accuracy compensation mechanism. Summary of the Invention

[0006] The purpose of this invention is to address the problem that existing CNC machine tool precision compensation mechanisms for workpiece positioning are not widely applicable, and to provide a CNC machine tool machining precision compensation mechanism to solve the above problem.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is: a CNC machine tool machining accuracy compensation mechanism, comprising a base, a symmetrical block, and a reference block, wherein the symmetrical block and the reference block are both fixed on the base;

[0008] A compensation rod is provided on the left side of the symmetrical block, a precision compensation component is provided between the compensation rod and the outer side of the symmetrical block, and a limiting component is provided on the symmetrical block;

[0009] The precision compensation component is used to apply a thrust to the compensation rod near the reference block.

[0010] The limiting component includes a linear transmission module disposed on the symmetrical block. The output end of the linear transmission module is rotatably connected to a limiting component. The linear transmission module drives the limiting component to perform linear motion. The bottom of the limiting component is inclined.

[0011] The compensation rod has a limiting groove for the bottom inclined surface of the limiting component to abut against.

[0012] In the above technical solution, the use of a precision compensation component can replace the traditional fixed-distance positioning method, thereby achieving positioning effect at any distance.

[0013] When used in conjunction with the linear transmission module and the limiting component, the limiting component can abut against the bottom of the adjacent limiting groove, thereby achieving the effect of physical limiting through the abutment of the inclined surface.

[0014] Furthermore, the linear transmission module includes an internally threaded cylinder fixed to the symmetrical block, and the internally threaded cylinder is connected to a threaded rod on its inner side.

[0015] The limiting member includes a trapezoidal block and a connecting protrusion fixed to the top of the trapezoidal block.

[0016] In the above technical solution, the linear transmission effect can be achieved through the cooperation of the threaded rod and the internal threaded cylinder; and under the action of the trapezoidal block, its bottom is an inclined surface, which can abut against the bottom inclined surface of the limiting groove.

[0017] Furthermore, a movable cavity is provided within the symmetrical block, and the movable cavity allows the trapezoidal block to slide and connect.

[0018] The trapezoidal block and connecting protrusion can be completely moved into the movable cavity.

[0019] In the above technical solution, the movable cavity can provide sliding and limiting effects for the trapezoidal block, and the trapezoidal block and connecting protrusion can be completely moved into the movable cavity, so as not to affect the compensation rod.

[0020] Furthermore, the bottom end of the threaded rod passes through the top of the symmetrical block and extends into the movable cavity, and the bottom end of the threaded rod is rotatably connected to the top of the connecting protrusion via a bearing.

[0021] In the above technical solution, the connecting protrusion and the threaded rod are rotatably connected, so that the rotation of the threaded rod will not affect the linear motion of the connecting protrusion.

[0022] Furthermore, the front and back of the limiting groove are both open, the inner side of the limiting groove is triangular, and the bottom of the limiting groove is a slope.

[0023] The trapezoidal block can be moved through the interior of the movable cavity into the adjacent limiting groove, and the bottom of the trapezoidal block can abut against the bottom of the adjacent limiting groove.

[0024] In the above technical solution, the position of the compensation rod can be kept fixed by the abutting fit between the limiting groove and the bottom inclined surface of the trapezoidal block.

[0025] Furthermore, the included angle between the threaded rod and the vertical line is α, where 30° < α < 40°.

[0026] In the above technical solution, the threaded rod can be arranged at an angle, and the reaction force when the trapezoidal block is squeezed is from bottom to top, which is different from the axial direction of the threaded rod. This makes the thread teeth of the threaded rod less susceptible to direct upward force, thereby improving the stability of the connection.

[0027] Furthermore, the precision compensation component includes a pull ring and an elastic element;

[0028] The pull ring is fixed to the end of the compensating rod away from the reference block, and the elastic element is fixed between the pull ring and the opposite side of the symmetrical block;

[0029] The symmetrical block and the reference block are arranged symmetrically from left to right.

[0030] In the above technical solution, pulling the pull ring can drive the compensation rod to move and stretch the elastic element.

[0031] Furthermore, the elastic element is a spring, and the elastic element is located on the outside of the compensating rod;

[0032] The end of the compensation rod near the reference block is provided with an abutment, and the elastic force of the elastic element points toward the abutment;

[0033] The abutment includes a connecting plate fixed to one end of the compensation rod near the reference block, an abutment block fixed to the side of the connecting plate near the reference block, and an anti-slip sleeve fixed to the outside of the abutment block;

[0034] The symmetrical block is provided with a guide, which provides guidance for the sliding of the connecting plate.

[0035] In the above technical solution, the elastic restoring force of the elastic element allows the compensation rod to abut against the outer side of the workpiece through the abutment, and the anti-slip sleeve can provide greater friction, thereby further improving stability.

[0036] Furthermore, the guide includes a first guide cylinder fixed to the right side of the symmetrical block, with both ends of the first guide cylinder being open, through which the compensation rod passes and slides.

[0037] The left side of the connecting plate is fixed to the guide rod, and the right side of the symmetrical block is fixed to the second guide cylinder;

[0038] The second guide cylinder has openings at both its left and right ends, and the left end of the guide rod passes through the second guide cylinder and the symmetrical block in sequence.

[0039] In the above technical solution, the connecting plate can move smoothly and stably in a straight line together with the compensation rod by using the first guide cylinder and the second guide cylinder and the guide rod.

[0040] Compared with the prior art, the beneficial effects of this utility model are:

[0041] 1. This CNC machine tool machining accuracy compensation mechanism enables the workpiece on the CNC machine tool to be positioned through the function of elastic accuracy compensation. This avoids the situation where fixed positioning parts are prone to large positioning errors due to accuracy errors, so that the positioning accuracy during CNC machine tool machining can meet the usage requirements of most workpieces, thereby controlling the overall machine cost.

[0042] 2. This CNC machine tool machining accuracy compensation mechanism limits the accuracy compensation component, and then, after the accuracy compensation component completes the basic positioning of the workpiece, it can be physically locked by the self-locking structure of the limiting component. By limiting the transmission angle of the limiting component, it can prevent the connecting parts from loosening due to the lifting force of the workpiece's pressure reaction force, thereby ensuring the stability of the positioning after accuracy compensation. Attached Figure Description

[0043] Figure 1 This is a schematic diagram of the overall structure of the CNC machine tool machining accuracy compensation mechanism provided in Embodiment 1 of this utility model;

[0044] Figure 2This is a cross-sectional schematic diagram of the symmetrical block connection structure in the CNC machine tool machining accuracy compensation mechanism provided in Embodiment 1 of this utility model;

[0045] Figure 3 This is a cross-sectional schematic diagram of the limit component in the CNC machine tool machining accuracy compensation mechanism provided in Embodiment 1 of this utility model;

[0046] Figure 4 This is a three-dimensional schematic diagram of the compensating rod in the CNC machine tool machining accuracy compensation mechanism provided in Embodiment 1 of this utility model.

[0047] In the diagram: 1. Base; 2. Symmetrical block; 3. Reference block; 4. Compensation rod;

[0048] 5. Precision compensation assembly; 51. Pull ring; 52. Elastic element; 53. First guide cylinder; 54. Guide rod; 55. Second guide cylinder;

[0049] 6. Abutment component; 61. Connecting plate; 62. Abutment block; 63. Anti-slip sleeve;

[0050] 7. Limiting component; 71. Internal threaded cylinder; 72. Threaded rod; 73. Movable cavity; 74. Trapezoidal block; 75. Connecting protrusion; 76. Limiting groove. Detailed Implementation

[0051] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0052] Please refer to Figures 1 to 4 The CNC machine tool machining accuracy compensation mechanism in this embodiment includes a base 1, a symmetrical block 2 and a reference block 3. The symmetrical block 2 and the reference block 3 are both fixed on the base 1. A compensation rod 4 is provided through the left side of the symmetrical block 2. A accuracy compensation component 5 is provided between the compensation rod 4 and the outer side of the symmetrical block 2. A limiting component 7 is provided on the symmetrical block 2. The accuracy compensation component 5 is used to apply a thrust to the compensation rod 4 near the reference block 3.

[0053] The limiting component 7 includes a linear transmission module disposed on the symmetrical block 2. The output end of the linear transmission module is rotatably connected to a limiting component. The linear transmission module drives the limiting component to perform linear motion. The bottom of the limiting component is inclined. The compensation rod 4 is provided with a limiting groove 76 for the inclined bottom surface of the limiting component to abut.

[0054] In the above technical solution, the use of the precision compensation component 5 can replace the traditional fixed spacing positioning method, thereby achieving positioning effect at any distance; and with the cooperation of the linear transmission module and the limiting component, the bottom of the limiting component and the adjacent limiting groove 76 can be abutted, thereby achieving the effect of physical limiting through the abutment cooperation of the inclined surface.

[0055] It should be noted that the reference block 3 is a positioning structure that has been verified by the CNC machine tool, so that when the workpiece abuts against the reference block 3, it can be within the reasonable range of the CNC machine tool processing, thereby enabling the precision compensation component 5 to achieve the effect of movable positioning, making it easier for the workpiece to be drilled by the CNC machine tool perpendicular to it.

[0056] like Figure 3 As shown, the linear transmission module includes an internally threaded cylinder 71 fixed on the symmetrical block 2. The internally threaded cylinder 71 is connected to a threaded rod 72 on its inner side. The linear transmission effect can be achieved through the cooperation of the threaded rod 72 and the internally threaded cylinder 71. The limiting component includes a trapezoidal block 74 and a connecting protrusion 75 fixed to the top of the trapezoidal block 74. The bottom of the trapezoidal block 74 is an inclined surface, which can abut against the bottom inclined surface of the limiting groove 76. Under the action of the inclined surface, if the compensating rod 4 is displaced, it can be restrained by the abutment of the inclined surface.

[0057] It should be noted that the angle between the threaded rod 72 and the vertical line is α, where 30° < α < 40°. Specifically, in this embodiment, the angle between the threaded rod 72 and the vertical line is 36°, which allows the threaded rod 72 to be laid at an angle. The reaction force of the trapezoidal block 74 when it is pressed is from bottom to top, which is different from the axial force of the threaded rod 72. This makes the thread teeth of the threaded rod 72 less susceptible to direct upward force, thereby improving the stability of the connection.

[0058] It should also be noted that the outer thread of the threaded rod 72 is a triangular thread, which has a stronger self-locking ability. Combined with the abutting friction of the trapezoidal block 74, it can achieve an extremely stable positioning effect.

[0059] like Figure 3 As shown, a movable cavity 73 is provided in the symmetrical block 2, and the movable cavity 73 allows the trapezoidal block 74 to slide and connect. The trapezoidal block 74 and the connecting protrusion 75 can be completely moved into the movable cavity 73, so that the movable cavity 73 can provide the sliding and limiting effect for the trapezoidal block 74, and the trapezoidal block 74 and the connecting protrusion 75 can be completely moved into the movable cavity 73, so as not to affect the compensation rod 4.

[0060] It should be noted that when the trapezoidal block 74 abuts against the adjacent limiting groove 76, the upper part of the trapezoidal block 74 is still located in the movable cavity 73, so that the trapezoidal block 74 will not be separated from the limitation of the movable cavity 73.

[0061] like Figure 3As shown, the bottom end of the threaded rod 72 passes through the top of the symmetrical block 2 and extends into the movable cavity 73. The bottom end of the threaded rod 72 is rotatably connected to the top of the connecting protrusion 75 through a bearing, so that the connecting protrusion 75 and the threaded rod 72 are rotatably connected, thereby ensuring that the rotation of the threaded rod 72 will not affect the linear movement of the connecting protrusion 75.

[0062] like Figure 3 and Figure 4 As shown, the front and back of the limiting groove 76 are both open, the inner side of the limiting groove 76 is triangular, and the bottom of the limiting groove 76 is a slope. The trapezoidal block 74 can move into the adjacent limiting groove 76 through the interior of the movable cavity 73. The bottom of the trapezoidal block 74 can abut against the bottom of the adjacent limiting groove 76. Through the abutment between the limiting groove 76 and the bottom slope of the trapezoidal block 74, the position of the compensation rod 4 can be kept fixed.

[0063] like Figure 1 and Figure 2 As shown, the precision compensation component 5 includes a pull ring 51 and an elastic element 52; the pull ring 51 is fixed to the end of the compensation rod 4 away from the reference block 3, and the elastic element 52 is fixed between the pull ring 51 and the opposite side of the symmetrical block 2; the symmetrical block 2 and the reference block 3 are arranged symmetrically from left to right, and by pulling the pull ring 51, the compensation rod 4 can be moved and the elastic element 52 can be stretched.

[0064] like Figure 2 As shown, the elastic element 52 is a spring, located on the outside of the compensating rod 4. The end of the compensating rod 4 near the reference block 3 is provided with an abutment 6, and the elastic force of the elastic element 52 points towards the abutment 6. The abutment 6 includes a connecting plate 61 fixed to the end of the compensating rod 4 near the reference block 3. An abutment 62 is fixed on the side of the connecting plate 61 near the reference block 3, and an anti-slip sleeve 63 is fixed on the outside of the abutment 62. A guide is provided on the symmetrical block 2, which provides guidance for the sliding of the connecting plate 61. Through the elastic restoring force of the elastic element 52, the compensating rod 4 can abut against the outside of the workpiece through the abutment 6, and under the action of the anti-slip sleeve 63, a large friction force can be provided, which further improves the stability.

[0065] like Figure 2As shown, the guide includes a first guide cylinder 53 fixed to the right side of the symmetrical block 2. Both ends of the first guide cylinder 53 are open, and the compensation rod 4 passes through and slides through the first guide cylinder 53. The left side of the connecting plate 61 is fixed to the guide rod 54, and the right side of the symmetrical block 2 is fixed to the second guide cylinder 55. Both ends of the second guide cylinder 55 are open, and the left end of the guide rod 54 passes through the second guide cylinder 55 and the symmetrical block 2 in sequence. Through the cooperation of the first guide cylinder 53 with the compensation rod 4, and the cooperation of the second guide cylinder 55 with the guide rod 54, the connecting plate 61 can move smoothly and stably in a straight line together with the compensation rod 4. The stability of the straight line movement can be guaranteed by using two limiting sliding structures in the same axial direction.

[0066] Operating procedure: In use, pull the pull ring 51 to move the compensation rod 4 away from the reference block 3, stretching the elastic element 52. Place the workpiece on the base 1, ensuring one side abuts against the reference block 3. Release the pull ring 51; under the restoring force of the elastic element 52, the pull ring 51 moves the compensation rod 4 closer to the workpiece, allowing the abutment block 62 to abut against the other side of the workpiece via the anti-slip sleeve 63, completing high-precision basic positioning. Rotate the threaded rod 72; with the inner thread engagement of the internal threaded cylinder 71, the threaded rod 72 can move the trapezoidal block 74. Furthermore, the sliding fit between the trapezoidal block 74 and the movable cavity 73 allows the trapezoidal block 74 to maintain a fixed posture during movement without rotation. This allows the trapezoidal block 74 to move to the inner side of the adjacent limiting groove 76, and the inclined surface of the trapezoidal block 74 to abut against the inner side of the adjacent limiting groove 76. The inclined surface greatly reduces the error during abutment. Thus, the abutment limiting of the trapezoidal block 74 ensures that the position of the compensation rod 4 is fixed, allowing the workpiece to be stably positioned between the reference block 3 and the abutment block 62, facilitating subsequent CNC machine tool processing of the workpiece.

[0067] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A CNC machine tool machining accuracy compensation mechanism, comprising a base (1), a symmetrical block (2) and a reference block (3), wherein the symmetrical block (2) and the reference block (3) are both fixed on the base (1); Its features are, A compensation rod (4) is provided on the left side of the symmetrical block (2), a precision compensation component (5) is provided between the compensation rod (4) and the outer side of the symmetrical block (2), and a limiting component (7) is provided on the symmetrical block (2). The precision compensation component (5) is used to apply a thrust to the compensation rod (4) near the reference block (3); The limiting component (7) includes a linear transmission module disposed on the symmetrical block (2). The output end of the linear transmission module is rotatably connected to a limiting component. The linear transmission module drives the limiting component to perform linear motion. The bottom of the limiting component is inclined. The compensation rod (4) is provided with a limiting groove (76) for the bottom inclined surface of the limiting component to abut.

2. The CNC machine tool machining accuracy compensation mechanism according to claim 1, characterized in that, The linear transmission module includes an internally threaded cylinder (71) fixed on the symmetrical block (2), and the internally threaded cylinder (71) is threadedly connected to a threaded rod (72) on its inner side; The limiting member includes a trapezoidal block (74) and a connecting protrusion (75) fixed to the top of the trapezoidal block (74).

3. The CNC machine tool machining accuracy compensation mechanism according to claim 2, characterized in that, The symmetrical block (2) has a movable cavity (73) inside, and the movable cavity (73) is used for sliding connection of the trapezoidal block (74); The trapezoidal block (74) and the connecting protrusion (75) can be fully moved into the movable cavity (73).

4. The CNC machine tool machining accuracy compensation mechanism according to claim 3, characterized in that, The bottom end of the threaded rod (72) passes through the top of the symmetrical block (2) and extends into the movable cavity (73). The bottom end of the threaded rod (72) is rotatably connected to the top of the bearing and the connecting protrusion (75).

5. The CNC machine tool machining accuracy compensation mechanism according to claim 3, characterized in that, The limiting groove (76) is open on both the front and back sides, the inner side of the limiting groove (76) is triangular, and the bottom of the limiting groove (76) is inclined. The trapezoidal block (74) can be moved into the adjacent limiting groove (76) through the interior of the movable cavity (73), and the bottom of the trapezoidal block (74) can abut against the bottom of the adjacent limiting groove (76).

6. The CNC machine tool machining accuracy compensation mechanism according to claim 2, characterized in that, The angle between the threaded rod (72) and the vertical line is α, where 30° < α < 40°.

7. The CNC machine tool machining accuracy compensation mechanism according to claim 1, characterized in that, The precision compensation component (5) includes a pull ring (51) and an elastic element (52); The pull ring (51) is fixed to one end of the compensating rod (4) away from the reference block (3), and the elastic element (52) is fixed between the pull ring (51) and the opposite side of the symmetrical block (2); The symmetrical block (2) and the reference block (3) are arranged symmetrically from left to right.

8. The CNC machine tool machining accuracy compensation mechanism according to claim 7, characterized in that, The elastic element (52) is a spring, and the elastic element (52) is located on the outside of the compensating rod (4); The compensation rod (4) has an abutment (6) at one end near the reference block (3), and the elastic force of the elastic element (52) points toward the abutment (6); The abutting member (6) includes a connecting plate (61) fixed to one end of the compensating rod (4) near the reference block (3), and an abutting block (62) is fixed on the side of the connecting plate (61) near the reference block (3), and an anti-slip sleeve (63) is fixed on the outside of the abutting block (62). The symmetrical block (2) is provided with a guide, which provides guidance for the sliding of the connecting plate (61).

9. The CNC machine tool machining accuracy compensation mechanism according to claim 8, characterized in that, The guide includes a first guide cylinder (53) fixed to the right side of the symmetrical block (2). Both ends of the first guide cylinder (53) are open. The first guide cylinder (53) allows the compensation rod (4) to pass through and slide. The left side of the connecting plate (61) is fixed to the guide rod (54), and the right side of the symmetrical block (2) is fixed with a second guide cylinder (55); The second guide cylinder (55) is open at both ends, and the left end of the guide rod (54) passes through the second guide cylinder (55) and the symmetrical block (2) in sequence.

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