Device for detecting end face runout of rotary motion object

Abstract

A device for detecting end face runout of a rotary motion object comprises a first measuring tool, a second measuring tool, a detector and a processor. The first measuring tool and the second measuring tool are both arranged on a workpiece rotation end face of a manufactured cutter. The detector contacts with the first measuring tool to obtain position information of a first detection point, and contacts with the second measuring tool to obtain position information of a second detection point. The processor obtains information of the detector and judges the end face jumping condition of the rotary motion object. When the device is used for detecting a cutter (or a workpiece), jumping data can be obtained through calculation according to the jumping data for calculation compensation or jumping minimization is achieved by adjusting variation on the two planes to be as small as possible.

Description

TECHNICAL FIELD

[0001] The utility model relates to a tool for measurement especially a device for carrying out workpiece processing by means of laser. BACKGROUND

[0002] Disc and rod workpieces are common in the mechanical industry. There are corresponding requirements for the runout of these workpieces during processing. Taking metal cutting tools as an example, various tools (drills, milling cutters, and reamers, etc.) are generally disc or rod workpieces of various sizes, mainly used for cutting processing, and rotate during processing. Such tools generally rotate at high speed, which in turn drives the cutting edge to contact, extrude, cut, and remove the processed material. When the tool rotation accuracy is poor (such as radial runout and / or axial runout), it will exacerbate cutting vibration, and in turn cause a series of cutting abnormalities such as deterioration of the processing surface roughness, shortening of the tool life, and significant deviation of the processing specifications. Therefore, how to reduce the radial runout and / or axial runout of the tool is an important technical content for the tool industry.

[0003] In the prior art, in order to obtain good runout, generally from the aspects of heat treatment (such as reserving a margin exceeding the heat treatment deformation before heat treatment → deforming during heat treatment → obtaining an accurate workpiece after removing the margin after heat treatment), installation during processing (using a higher-precision tool holder or other rod clamping device), compensation during processing (using a contact probe or a laser measurement device to detect the runout of the clamped rod and compensate the coordinates in the processing code according to the detection result), temperature control during processing (using water cooling or air cooling to avoid thermal deformation caused by processing), and adjustment during use (using a higher-precision tool holder or directly using a tool clamping device that can compensate for the runout), in addition to the above, the runout of the processed tool is mainly ensured by the rotation accuracy of the processing equipment itself.

[0004] In practice, the above technical means are generally used in combination. For example, a high-precision HSK interface is used to improve the runout during tool installation, a surface measurement is used to adjust the runout during tool installation through a flange interface, and finally a probe is used to detect the runout of the tool on the spindle and compensate through the processing program.

[0005] Both face runout and radial runout are used to represent the runout of a workpiece, and can be converted into each other, but due to the asymmetric effect between the angle increment and the distance increment, we cannot always check and measure the true runout at the cutting edge by the change in the radial distance between the face of the workpiece and the center axis at any two points on the face. Generally speaking, when the tool diameter is very large, even if the measured value of the radial runout t11 is very small, the face runout t12 may be large (see Figure 1 ). Correspondingly, when the tool length is very long, such asFigure 2 Even if the end face run-out t21 is already very small, the radial run-out t22 can be large. Therefore, the run-out of a large diameter tool is not always measured reliably by the general two-point method of the circumference.

[0006] Generally, regardless of the measurement method, the measurement of run-out requires that two circumferential surfaces at a certain distance apart on a cylindrical part be determined, the variation in the radial distance between the two circumferential surfaces and the central axis is checked, and the total run-out data is calculated to calculate compensation or to minimize the run-out by adjusting the variation to be as small as possible on the two planes. However, the prior art has considerable limitations when the shape of the tool changes, and due to the asymmetric effect between the angle increment and the distance increment, the technician cannot always check and measure the true run-out of the cutting edge by the variation in the radial distance between the circumferential surfaces at any two places on the tool and the central axis. For example, when the overall axial length of the tool is very long, but the run-out reference position is too far from the cutting edge, or the diameter of the tool is very long, even if the variation in the radial distance between the circumferential surfaces at the two reference positions and the central axis is small enough, it is not enough to guarantee the run-out at the position of the cutting edge.

[0007] In addition, direct measurement techniques based on vision or laser have also been developed, and such non-contact direct measurement of the run-out of the cutting edge of the tool has become a more reliable technical solution. However, the non-contact measurement method also has its inherent defects, such as the measurement accuracy changing with the diameter of the measured object. When the diameter exceeds 50 mm, the accuracy of the existing laser measurement will decrease significantly, and therefore, whether it is laser or vision measurement, in actual situations or the measurement range is very small, or a complex mechanical structure must be introduced to control the positional relationship between the camera / lens and the measured object, and the non-contact measurement is performed in a manner similar to three-coordinate measurement. The above-mentioned various limitations in application scenarios and costs limit the application of these technologies in precise measurement of tool run-out. Practical new type content

[0008] One purpose of the present application is to provide a device for detecting run-out to detect and understand the run-out of the end face of a rotating object, which is beneficial to the manufacture of tools.

[0009] Another purpose of the present application is to provide a device for detecting run-out to detect and understand the run-out of the end face of a rotating object, which is beneficial to the manufacture of tools with a rotating end face diameter greater than 50 mm.

[0010] In machining, the commonly used machining tools currently include: grinding wheels, cutting tools, and lasers, etc.

[0011] In machining, the so-called material or workpiece is usually a material or semi-finished product used to manufacture parts or components, and is the processing object in the machining process. That is, after machining the workpiece, a product that meets the processing or design requirements is obtained, such as hole machining tools and milling cutters. For workpieces used for tool machining, it usually includes an axis, and the axial length is greater than the radial length.

[0012] Precision machining refers to a machining technology with extremely high machining precision and surface quality. For example, in tool machining, the size, straightness, profile, surface roughness, blade tip arc radius, and machining precision are all higher than micron level.

[0013] Machining equipment (or machining center) is a machining equipment with multiple motion axes. That is, in a right-handed Cartesian coordinate system, X, Y, and Z axes move in a straight line, and A, B, and C axes rotate around X, Y, and Z axes, respectively. For example, a numerical control machine tool usually loads various control software to receive and issue various instructions in code form to automatically process the workpiece. For example, the method for forming the drill point of the machining tool provided by the utility model forms a control code, which can be automatically implemented on the machining equipment and obtain a product that meets the processing or design requirements.

[0014] In order to more accurately measure and calculate the runout at the blade position, especially the blade position of a large-diameter tool, while avoiding the above problems of non-contact measurement, the utility model provides a device, which comprises:

[0015] A first reference plane and a second reference plane are arranged on the workpiece rotary end face of the formed tool, the first reference plane is larger than the second reference plane, so that the outer edge of the second reference plane is closer to the rotary center than the outer edge of the first reference plane;

[0016] First detection point position information is obtained on the first reference plane, and second detection point position information is set on the second reference plane. From the perspective of the normal projection of the rotary end face, the line connecting the first detection point and the second detection point passes through the end face rotary center, and a group of detection marks are formed;

[0017] During the rotary end face, at least two groups of detection marks are obtained;

[0018] When the position information of the two groups of detection marks deviates in the direction of the rotation axis, it is considered that runout has occurred;

[0019] The size of the deviation value is positively correlated with the degree of runout occurrence.

[0020] For a small runout, multiple detection marks are required. When only two groups of detection marks are used, the position information obtained before and after the rotary end face rotates 180°.

[0021] The distance of the interval in the radial direction of the rotary end face is taken as the interval distance, and the interval distance is at least 30% of the shortest distance from the outer edge of the first reference plane to the cutting edge.

[0022] The device of the utility model, the first reference plane is a circular ring face. The ring width is more than 1mm. The interval is arranged between the first reference plane and the second reference plane.

[0023] The device of the utility model, the second reference plane is a circular ring face. The ring width is more than 1mm.

[0024] The device of the utility model, the second reference plane is a circular ring face. The inner diameter is more than 5mm.

[0025] The device of the utility model, comprising:

[0026] The first measuring tool is arranged on the rotary end face of the workpiece for making the cutter;

[0027] The second measuring tool is arranged on the rotary end face of the workpiece for making the cutter;

[0028] The detector obtains the first detection point position information by contacting the first measuring tool and obtains the second detection point position information by contacting the second measuring tool; and

[0029] The processor obtains the information of the detector and judges the end face runout of the rotary moving object;

[0030] The interval is arranged between the first measuring tool and the second measuring tool, and the distance of the interval in the radial direction of the rotary end face is taken as the interval distance.

[0031] The processor observes the first detection point and the second detection point from the orthographic projection of the rotary end face, and the line connecting the first detection point and the second detection point passes through the rotary center of the end face, which is taken as a group of detection marks.

[0032] The first measuring tool comprises a circular ring face, which is taken as the first reference plane and contacts the detector so that the detector obtains the first detection point position information.

[0033] The second measuring tool comprises a circular ring face, which is taken as the second reference plane and contacts the detector so that the detector obtains the second detection point position information.

[0034] The interval distance between the first reference plane and the second reference plane is at least 30% of the shortest distance from the outer edge of the first reference plane to the cutting edge.

[0035] The first measuring tool and the second measuring tool are separately or jointly taken as the circular ring face, and the ring width is 1mm or more. The two circular arc lines defining the circular ring face are taken as continuous arc lines or segmented line segments, and the interval is formed between the line segments, but the line segments as a whole still present the circular arc arrangement.

[0036] By acquiring the information of different positions of the rotating end surface of the tool (or workpiece) in different states, the variation of the axial distance between the rotating shaft end surface and the workpiece, and calculating the runout data for compensation or minimizing the runout by adjusting the variation to be as small as possible on the two planes. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 A schematic diagram of tool runout with a large-diameter end surface;

[0038] Figure 2 A schematic diagram of tool end surface runout with a long axis system;

[0039] Figure 3 A schematic diagram of an embodiment of the device of the utility model for application to a large-diameter end surface;

[0040] Figure 4 A schematic diagram of an embodiment of the device of the utility model for detecting runout;

[0041] Figure 5 A schematic diagram of another embodiment of the device of the utility model for detecting tool end surface runout. DETAILED DESCRIPTION

[0042] The technical solutions of the utility model are described in detail below with reference to the drawings. The embodiments of the utility model are only used to illustrate the technical solutions of the utility model and not to limit. Although the utility model is described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the utility model can be modified or replaced equivalently without departing from the spirit and scope of the technical solutions of the utility model, and all should be covered in the scope of the claims of the utility model.

[0043] The large-diameter end surface is usually a tool with a diameter of 50 mm or above or a workpiece to be made into a tool. Figure 3 A schematic diagram of an embodiment of the device of the utility model for application to a large-diameter end surface. As shown in Figure 3 The first gauge 100 and the second gauge 200 are annular, with a width of 1 mm or above and a surface roughness of less than Ra1 μm, and are both arranged on the rotating end surface 10 of the workpiece to be made into a tool. A gap is provided between the first gauge and the second gauge, and the distance of the gap in the radial layout of the rotating end surface is taken as the gap distance. The first gauge 100 includes a circular ring surface 110 as a first reference plane to contact a detector (not shown) so that the detector obtains first detection point position information. The second gauge 200 includes a circular ring surface 210 as a second reference plane to contact the detector so that the detector obtains second detection point position information. The gap distance L2 between the first reference plane 110 and the second reference plane 210 is at least 30% of the shortest distance L1 from the outer edge of the first reference plane to the tool edge 20.

[0044] Figure 4 Figure 1 is a schematic diagram of an embodiment of the device judging runout. In combination with Figure 3 Figure 2 is a schematic diagram of the device judging runout. As shown in Figure 4 , the end surface 10 is the end surface reference surface, but in practice, it is difficult to be measured and known, and the end surface 11 and the end surface 12 are the actual states of the end surface in the rotary motion. When the state of the end surface 11 is obtained, the first detection point position information A is obtained on the first reference plane, and the second detection point position information B is set on the second reference plane. From the perspective of the rotary end surface orthographic projection, the line connecting the first detection point and the second detection point passes through the rotary center of the end surface, and the first set of detection marks is formed. When the end surface is rotated to the state of the end surface 12, the first detection point position information A' is obtained on the first reference plane, and the second detection point position information B' is set on the second reference plane. From the perspective of the rotary end surface orthographic projection, the line connecting the first detection point and the second detection point passes through the rotary center of the end surface, and the second set of detection marks is formed.

[0045] The two sets of detection mark information obtained above are processed by the processor. When the position information in the rotation axis direction deviates, it is considered that runout occurs. The size of the deviation value is positively correlated with the degree of runout occurrence. In this way, after adjustment, when the deviation value continuously decreases, it indicates that the rotary end surface of the tool (or the workpiece) is closer to the reference end surface 10, and the rotary precision of the actual application processing is higher, and the surface quality of the processing is higher.

[0046] Preferably, the inner diameter of the annular second gauge 200 of the embodiment is usually more than 5 mm, so that the detection points are at least 5 mm away from the rotary center. When the second gauge 200 is a whole continuous plane (such as a circular surface with a diameter of less than 6 mm), or the annular second gauge 200 with a smaller inner diameter (such as 4 mm or less) is arranged on the rotary end surface, so that the detection points are close to the rotary center or on the rotary center, the detection point position information and the deviation value will be considered as 0, and the degree of runout occurrence of the rotary end surface can also be obtained by measuring the position information of the detection point on the first reference plane, but the obtained information still deviates from the actual situation.

[0047] Taking a general disc cutter with a shank diameter of 32 mm, a shank length of 45 mm, and a blade diameter of 180 mm as an example, as shown in Figure 5 , due to the short shank, the tool mounting runout can be measured as 5 μm in the circumferential direction according to the existing runout detection method, which can theoretically meet the tool runout requirement, but if the scheme of the embodiment is used for measurement, the first gauge and the second gauge are arranged near the blade region and the center region respectively, and the measurement is performed accordingly, the actual circumferential and end surface runout of the tool can be measured as 5 μm and 12 μm respectively, which cannot meet the tool runout processing requirement, and the installation position needs to be adjusted or compensation needs to be performed to obtain the product with correct precision requirement.

Claims

1. An apparatus for detecting end face runout of a rotating object, characterized by The utility model relates to a kind of detecting device for rotary motion object, including: First gauge, it is arranged on the rotary end surface of workpiece made into cutter Second gauge, it is arranged on the rotary end surface of workpiece made into cutter, Detector, it obtains first detection point position information with first gauge contact, and second detection point position information with second gauge contact; And Processor, obtains the information of detector, judges the end surface runout of rotary motion object; The interval is set between first gauge and second gauge.

2. The apparatus of claim 1, wherein The processor will be observed from the orthographic projection of rotary end surface, the line of first detection point and second detection point passes through end surface rotation center, as a group of detection marks, and at least according to two groups of detection marks, the position information in the direction of rotation shaft is deviated, then it is judged that runout has occurred.

3. The apparatus of claim 1, wherein The first gauge includes circular ring surface, as first reference plane and detector contact, so that detector obtains first detection point position information.

4. The apparatus of claim 1, wherein The second gauge includes circular ring surface, as second reference plane and detector contact, so that detector obtains second detection point position information.

5. The apparatus of claim 1, wherein The first gauge includes circular ring surface, as first reference plane and detector contact, so that detector obtains first detection point position information, and the second gauge includes circular ring surface, as second reference plane and detector contact, so that detector obtains second detection point position information, the interval distance of first reference plane and second reference plane is at least 30% of the shortest distance from the outer edge of first reference plane to cutter edge.

6. The apparatus of claim 1, wherein The first gauge is annular, and the width is 1mm or above.

7. The apparatus of claim 1, wherein The second gauge is annular, and the width is 1mm or above.

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