Probe and detection device

Abstract

The invention discloses a probe and a detection device, a cylindrical body and a spherical crown part are integrated on a probe, the end surface, far away from the cylindrical body, of the spherical crown part is set as a round plane, and detection areas are formed on the cylindrical body, the spherical crown part and the round plane; the plane position of a workpiece can be detected through the first detection area on the spherical crown part, the cylindrical surface of the workpiece can be detected through the first detection area of the cylindrical body, and the arc vertex of the workpiece can be detected through the circular plane. Therefore, point-to-multi-surface or point-to-line contact between the probe and the measured workpiece is always kept, errors caused by point-to-point contact are avoided, the probe does not need to be replaced, the operation is more convenient, and the measurement precision and efficiency of the probe are improved.

Description

Technical Field

[0001] The present application relates to CNC machining detection technology, and in particular to a probe and a detection device. Background Art

[0002] In the prior art, it is often involved to detect different surfaces of a workpiece. With the diversification of workpiece structures, the shapes of surfaces at different positions of a single workpiece vary greatly. For example, a workpiece may have a hole structure, a slide groove structure, a cylindrical structure, etc. However, the probe of a traditional probe is generally a cylinder or a sphere. When detecting the height of the cylindrical surface of a complex workpiece, the sphere is prone to slipping, resulting in distortion of the probe value. When detecting the side wall of a circular hole, the cylinder is easily affected by the operating environment. As a result, different types of probes need to be used to detect multiple planes of different shapes on a complex workpiece in order to meet the detection accuracy. Therefore, the related art cannot take into account both the convenience of use and the detection accuracy when detecting workpieces with complex surface structures. Summary of the invention

[0003] The present application aims to overcome the deficiencies of the prior art and to provide a probe and a detection device that can achieve both ease of use and detection accuracy when detecting a workpiece with a complex surface structure.

[0004] According to the first aspect of the embodiment of the present application, a probe is provided, comprising:

[0005] The probe comprises a cylindrical body and a spherical crown; the first end of the cylindrical body is connected to the spherical crown, the end face of the spherical crown away from the cylindrical body is arranged as a circular plane, the central axis of the cylindrical body and the central axis of the spherical crown coincide with each other and pass through the center of the circular plane, the arc surfaces of the cylindrical body and the spherical crown both form a first detection area, and the circular plane forms a second detection area.

[0006] According to some embodiments of the first aspect of the present application, the probe further comprises:

[0007] An extension rod, the extension rod includes a trunk and a telescopic part, the trunk includes a support part and a first gap-avoiding part, the first end of the support part is connected to the first end of the first gap-avoiding part, the second end of the first gap-avoiding part is sleeved on the telescopic part and movably connected to the telescopic part, the second end of the first gap-avoiding part has a smaller size than the first end of the first gap-avoiding part, and the second end of the telescopic part is connected to the second end of the cylindrical body.

[0008] According to some embodiments of the first aspect of the present application, a second gap portion is provided between the cylindrical body and the telescopic portion, the first end of the second gap portion is connected to the second end of the cylinder, and the size of the first end of the second gap portion is larger than the size of the second end.

[0009] According to some embodiments of the first aspect of the present application, the angle formed by the generatrix of the second gap-avoiding portion and the central axis of the cylindrical body is between 20° and 30°.

[0010] According to some embodiments of the first aspect of the present application, the height of the spherical crown is between 0.2 mm and 0.3 mm, and the diameter of the sphere of the spherical crown is 1.5 mm; the diameter of the circular plane is between 0.8 mm and 1.0 mm.

[0011] According to some embodiments of the first aspect of the present application, a first transition region is provided between the cylindrical body and the spherical crown portion, a second transition region is provided at the connection between the spherical crown portion and the circular plane, and the first transition region and the second transition region are both arc surfaces.

[0012] According to some embodiments of the first aspect of the present application, the radius of the first transition region is between 0.2 mm and 0.5 mm, and the radius of the second transition region is between 0.1 mm and 0.3 mm.

[0013] According to some embodiments of the first aspect of the present application, a chamfered surface is provided between the telescopic portion and the cylindrical body.

[0014] According to some embodiments of the first aspect of the present application, the support portion is hollow, a force-applying mounting hole is provided on a side of the support portion, and a mounting structure is provided on the second end of the support portion.

[0015] According to some embodiments of the second aspect of the present application, a detection device is provided, comprising the probe described in the first aspect.

[0016] The above-mentioned embodiments of the present application have at least the following beneficial effects: by integrating the cylindrical body and the spherical crown on a probe, and setting the end face of the spherical crown away from the cylindrical body as a circular plane, and forming detection areas on the cylindrical body, the spherical crown and the circular plane, at this time, the plane of the workpiece can be detected through the first detection area on the spherical crown, the cylindrical surface of the workpiece can be detected through the first detection area of ​​the cylindrical body, and the arc vertex of the workpiece can be detected through the circular plane; thereby ensuring that the probe and the workpiece being measured always maintain point-to-multi-face or point-to-line contact, avoiding errors caused by point-to-point contact. And the probe of the embodiment of the present application does not need to replace the probe, and the operation is more convenient. Therefore, compared with the related art, the embodiment of the present application can realize the detection of workpieces with complex surface structures while taking into account the convenience of use and detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present application is further described below with reference to the accompanying drawings and embodiments, wherein:

[0018] Figure 1 This is a schematic diagram of the main structure of a probe in one embodiment of the probe of the present application;

[0019] Figure 2 A detailed schematic diagram of probe A in one embodiment of the probe of the present application;

[0020] Figure 3 A schematic diagram of the connection of a detection device in one embodiment of the probe of the present application;

[0021] Figure 4 A schematic diagram of the relative positions of the probe points of the probe and the workpiece in one embodiment of the probe of the present application;

[0022] Reference numerals:

[0023] Probe 100, 3D machine tool probe 200; trunk 110, support part 111, first avoidance part 112, force installation hole 113, telescopic part 120, second avoidance part 130, cylindrical body 140, spherical crown part 160, circular plane 180, first transition area 150, second transition area 170; workpiece 300. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0025] It should be noted that in the description of the embodiments of the present application, the term "includes", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of further restrictions, the elements defined by the sentence "including one..." do not exclude the presence of other identical elements in the process, method, article or equipment including the elements. The orientation or positional relationship indicated by the terms "upper", "lower", "vertical", "horizontal", "top", "bottom", etc. is based on the orientation or positional relationship shown in the accompanying drawings, only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application.

[0026] In this application, unless otherwise clearly specified and limited, the terms "connected", "fixed", etc. should be understood in a broad sense, which can be directly connected or indirectly connected through an intermediate medium, and can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. The terms "first", "second", etc. in this application are used to distinguish similar objects, and are not used to describe a specific order or sequence.

[0027] The probe 100 can be used as a tool for CNC machining detection and can also be manually operated. When the probe is applied to the CNC machining scenario, the probe 100 is connected to the 3D machine tool probe 200. The probe is installed on the detection machine through the 3D machine tool probe 200. The probe and the 3D machine tool probe 200 touch the contour of the workpiece driven by the detection machine. According to the signal fed back by the probe to the 3D machine tool probe and the detection machine, the machine tool can calculate the position parameters of the workpiece. Therefore, the probe and the 3D machine tool probe can realize three-dimensional measurement on high-precision machining centers and multi-axis machine tools, and can perform high-precision three-dimensional space measurement during the machining process, compensate for the secondary positioning error of the workpiece, and realize precise machining and quality control of complex-shaped workpieces.

[0028] Reference below Figures 1 to 3 A probe 100 according to an embodiment of the present application is described.

[0029] The probe 100 according to an embodiment of the present application includes:

[0030] The probe includes a cylindrical body 140 and a spherical crown 160; the first end of the cylindrical body 140 is connected to the spherical crown 160, and the end surface of the spherical crown 160 away from the cylindrical body 140 is set as a circular plane 180, the central axis of the cylindrical body 140 and the central axis of the spherical crown 160 coincide and pass through the center of the circular plane 180, the arc surfaces of the cylindrical body 140 and the spherical crown 160 are both formed with a first detection area, and a second detection area is formed on the circular plane 180.

[0031] The probe 100 of the embodiment of the present application integrates a cylindrical body 140 and a spherical crown 160 on a probe, and sets the end face of the spherical crown 160 away from the cylindrical body 140 as a circular plane, and forms detection areas on the cylindrical body 140, the spherical crown 160 and the circular plane 180. At this time, the plane of the workpiece can be detected through the first detection area on the spherical crown 160, the cylindrical surface of the workpiece can be detected through the first detection area of ​​the cylindrical body 140, and the arc vertex of the workpiece can be detected through the circular plane 180; thereby ensuring that the probe and the workpiece being measured always maintain point-to-multi-face or point-to-line contact, avoiding errors caused by point-to-point contact. And the probe of the embodiment of the present application does not need to replace the probe, and the operation is more convenient. Therefore, compared with the related art, the embodiment of the present application can realize the detection of workpieces with complex surface structures while taking into account the convenience of use and detection accuracy.

[0032] In one embodiment, referring to Figure 1 The probe 100 includes an extension rod, which includes a trunk 110 and a telescopic portion 120. The trunk 110 includes a support portion 111 and a first gap-avoiding portion 112. The first end of the support portion 111 is connected to the first end of the first gap-avoiding portion 112. The second end of the first gap-avoiding portion 112 is sleeved on the telescopic portion 120 and movably connected to the telescopic portion. The second end of the first gap-avoiding portion 112 has a smaller size than the first end of the first gap-avoiding portion 112. The second end of the telescopic portion 120 is connected to the second end of the cylindrical body 140.

[0033] The embodiment of the present application does not limit how the telescopic part 120 can be extended and retracted, such as by providing a spring, a spring sheet, etc. A clamping structure can be provided at the connection between the first air-avoiding part 112 and the telescopic part 120, so that after the telescopic part 120 is adjusted, the clamping structure can be used to meet the requirements of the overall length of different probes, so that when it is applied to a machine tool, it can maintain a safe distance from the workpiece to be detected as much as possible, reducing the probability of collision between the probe and the workpiece.

[0034] The embodiment of the present application does not limit the specific range of the safety distance, and the length can be adjusted according to the specific needs of the product. In some embodiments, the length of the extension rod can be adjusted so that the safety distance between the probe 100 and the detected workpiece is maintained between 10-60 mm, further ensuring the accuracy of the probe 100.

[0035] In one embodiment, referring to Figure 1 A second avoidance portion 130 is provided between the cylindrical body 140 and the telescopic portion 120 , a first end of the second avoidance portion 130 is connected to a second end of the cylindrical body 140 , and a size of the first end of the second avoidance portion 130 is larger than a size of the second end.

[0036] It should be noted that the included angle between the second avoiding portion 130 and the cylindrical body 140 is between 20° and 30°.

[0037] The extension rod is set to be larger than the diameter of the cylindrical body 140 to reduce the problem of insufficient strength of the probe 100 used for detection during CNC processing due to the small diameter of the extension rod, thereby improving the measurement accuracy. Through this setting, the telescopic part 120 and the cylindrical body 140 are firmly connected, so that the probe 100 can be used to perform high-precision detection of the workpiece to be detected during CNC processing. For example, the angle is 20°, 25°, or 30°.

[0038] In one embodiment, referring to Figure 1 The height of the spherical crown 160 is between 0.2 mm and 0.3 mm, the diameter of the sphere of the spherical crown 160 is 1.5 mm, and the diameter of the circular plane 180 is between 0.8 mm and 1.0 mm.

[0039] The height of the spherical crown 160 can be 0.2 mm, or 0.3 mm, or 0.25 mm, etc., and those skilled in the art can selectively set it according to actual needs.

[0040] The circular plane diameter can be set to 0.88mm, 1.0mm, or 0.9mm.

[0041] For example, the height of the spherical crown 160 is 0.25 mm, so that the first detection area formed on the arc surface of the spherical crown 160 can adapt to the measurement of more workpieces, thereby ensuring the measurement accuracy of the spherical crown 160. Due to the influence of oil residues and other factors in the processing environment of the machine, the circular plane should be reduced as much as possible to reduce the contact area, thereby using an automated processing room to reduce the risk of interference from residues and foreign objects. For example, Figure 2 As shown, the diameter of the circular plane 180 is 0.8 mm, which reduces the interference risk of the machine processing environment to a certain extent, improves the measurement accuracy and stability of the probe 100, and effectively improves the product yield.

[0042] In one embodiment, referring to Figure 1 A first transition region 150 is provided between the cylindrical body 140 and the spherical crown portion 160 , and a second transition region 170 is provided between the spherical crown portion 160 and the circular plane 180 , wherein both the first transition region 150 and the second transition region 170 are arc surfaces.

[0043] It should be noted that the first transition area 150 is obtained by performing a chamfering operation on the edge of one end of the cylindrical body 140, creating an arc shape at the edge, thereby forming a smooth transition area; the second transition area 170 is obtained by performing a chamfering operation on the sharp edge at the cut-off position of the spherical crown 160, creating an arc shape at the sharp edge, thereby forming a smooth transition area; the cylindrical body 140 is smoothly connected to the spherical crown 160 via the first transition area 150; the spherical crown 160 is smoothly connected to the circular plane 180 via the second transition area 170.

[0044] It should be noted that the radius of the first transition region 150 is between 0.2 mm and 0.5 mm, and the radius of the second transition region 170 is between 0.1 mm and 0.3 mm.

[0045] The arc-shaped transition area can be provided to facilitate turning processing, reduce the risk of stress concentration of the probe and improve the strength.

[0046] In one embodiment, a chamfered surface is provided between the telescopic portion 120 and the cylindrical body 140 .

[0047] For example, the fillet radius of the first transition area 150 is 0.3 mm, and the fillet radius of the second transition area 170 is 0.2 mm. A chamfered surface is also provided between the telescopic portion 120 and the cylindrical body 140 for smooth connection.

[0048] In one embodiment, the support portion 111 is hollow, and a force installation hole 113 is provided on the side of the support portion 111, and a mounting structure is provided at the second end of the support portion 111. In some embodiments, the mounting structure is provided with a screw having an external thread, and the screw can be rotated by passing a hexagonal wrench rod through the force installation hole 113, thereby achieving force tightening installation of the probe 100, thereby improving the stability of the installation connection of the probe 100.

[0049] The embodiments of the present application do not limit how to use the probe 100. For example, in one embodiment, the detection device includes the probe 100, which is connected to the 3D machine tool probe 200. The probe 100 touches the contour of the workpiece under the drive of the detection machine. The actual position parameters of the workpiece are calculated based on the signals fed back by the probe 100 to the 3D machine tool probe 200 and the machine, thereby realizing precise processing and quality control of workpieces with complex shapes.

[0050] For example, the probe 100 of the embodiment of the present application is applied to a 3D machine tool to detect a workpiece 300 of a complex shape. Figure 4As shown, from left to right, there are the first probe point a, the second probe point b, the third probe point c, the fifth probe point e, and the fourth probe point d, which means that the probe 100 is sequentially moved to five different detection positions on the workpiece 300 for detection, and does not mean that there are multiple probes 100 to detect the workpiece 300. Among them, the shape of the first probe point and the second probe point is a plane, and the coordinates of the first probe point a and the second probe point b are measured by the spherical crown 160 of the probe 100, which is used to calculate the difference between the workpiece coordinates and the machine tool coordinates, so as to correct the coordinate system, realize positioning error compensation, and ensure the unity of the workpiece reference and dimensional stability; the shape of the third probe point c and the fourth probe point d is a cylindrical surface, which is used to center the features of the workpiece 300 and determine the center point, so as to realize positioning error compensation, and ensure the unity of the workpiece reference and dimensional stability; the shape of the fifth probe point e is an arc point, which is used to measure and calculate the actual three-dimensional height coordinates of the workpiece, so as to realize positioning error compensation, and ensure the unity of the workpiece reference and dimensional stability.

[0051] The accurate position of the workpiece on the machine tool is determined by measurement, and the secondary positioning error of the workpiece is compensated. If the 3D contour of the product is required to be high, the positioning error of the product must be guaranteed to be within a certain range. The positioning error of the machine tool fixture cannot meet the requirements, so the fixture needs to be roughly positioned, and then the CNC machine probe system is used to compensate for the positioning error, so that the workpiece coordinate system coincides with the design datum of the product, thereby improving the stability and accuracy of the measurement. For probe points of different shapes, different probing parts of the probe 100 are used for measurement. For example, the spherical crown 160 of the probe 100 is used to measure the plane shape, the cylindrical body 140 of the probe 100 is used to measure the cylindrical shape, and the circular plane 180 of the probe 100 is used to measure the arc vertex. Such selection of probing parts largely solves the problem of the probe ball head slipping when contacting the product surface during the measurement of special parts in the processing part, resulting in distortion of the measured data, and reduces the risk of interference in the cylindrical probe measurement caused by the machine processing environment, such as hole burrs, residues, cutting oil, etc., thereby greatly improving the measurement accuracy, achieving multi-dimensional precise and stable probing of complex parts, improving the versatility and stability of the probe, and the processing dimensional stability meets CPK1.67 or above.

[0052] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0053] The above is a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present application. These improvements and modifications are also considered to be within the scope of protection of the present application.

[0054] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A probe, characterized in that: include: The probe comprises a cylindrical body and a spherical crown; the first end of the cylindrical body is connected to the spherical crown, the end face of the spherical crown away from the cylindrical body is arranged as a circular plane, the central axis of the cylindrical body and the central axis of the spherical crown coincide with each other and pass through the center of the circular plane, the arc surfaces of the cylindrical body and the spherical crown both form a first detection area, and the circular plane forms a second detection area.

2. The probe according to claim 1, characterized in that The probe further comprises: An extension rod, the extension rod includes a trunk and a telescopic part, the trunk includes a support part and a first gap-avoiding part, the first end of the support part is connected to the first end of the first gap-avoiding part, the second end of the first gap-avoiding part is sleeved on the telescopic part and movably connected to the telescopic part, the second end of the first gap-avoiding part has a smaller size than the first end of the first gap-avoiding part, and the second end of the telescopic part is connected to the second end of the cylindrical body.

3. The probe according to claim 2, characterized in that: A second gap avoiding portion is provided between the cylindrical body and the telescopic portion, a first end of the second gap avoiding portion is connected to a second end of the cylindrical body, and a size of the first end of the second gap avoiding portion is larger than a size of the second end.

4. The probe according to claim 3, characterized in that The included angle formed by the generatrix of the second gap-avoiding portion and the central axis of the cylindrical body is between 20° and 30°.

5. The probe according to claim 1, characterized in that: The height of the spherical crown is between 0.2 mm and 0.3 mm, and the diameter of the sphere of the spherical crown is 1.5 mm; the diameter of the circular plane is between 0.8 mm and 1.0 mm.

6. The probe according to claim 1, characterized in that: A first transition region is provided between the cylindrical body and the spherical crown portion, and a second transition region is provided at the connection between the spherical crown portion and the circular plane. Both the first transition region and the second transition region are arc surfaces.

7. The probe according to claim 6, characterized in that: The radius of the first transition area is between 0.2 mm and 0.5 mm, and the radius of the second transition area is between 0.1 mm and 0.3 mm.

8. The probe according to claim 2, characterized in that: A chamfered surface is provided between the telescopic portion and the cylindrical body.

9. The probe according to claim 2, characterized in that: The support portion is hollow, and a force installation hole is provided on a side of the support portion. A mounting structure is provided on the second end of the support portion.

10. A detection device, characterized in that: Comprising the probe according to any one of claims 1 to 9.

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