A coaxiality calibration tool and a coaxiality calibration method

Abstract

A coaxiality calibration tool and a coaxiality calibration method. The coaxiality calibration tool comprises a core shaft, a sleeve shaft and an elastic reset member. The sleeve shaft is provided with an inner cavity, the core shaft and the inner cavity of the sleeve shaft are slidably matched, the front end of the core shaft and the rear end of the sleeve shaft are provided with abutment parts, and the elastic reset member acts on the core shaft to drive the core shaft to reset. Since the coaxiality calibration tool is retractable in length, it can calibrate products of different lengths within the range of the telescopic stroke, greatly improving the scope of application and use efficiency of the tool. At the same time, abutment parts are used at both ends, leaving no matching gap with the calibrated product, thereby improving the calibration accuracy.

Description

Technical Field

[0001] The invention relates to the technical field of coaxiality calibration, and in particular to a coaxiality calibration tool and a coaxiality calibration method. Background Art

[0002] The coaxiality calibration test rods currently on the market are non-retractable rod-shaped tools with cylindrical surfaces at both ends. A test rod of one length can only calibrate products of the same length. When products of different lengths need to be calibrated, test rods of different lengths need to be used. In addition, there is a clearance between the circular surfaces at both ends of the test rod and the calibration product, which will inevitably affect the calibration accuracy. Summary of the invention

[0003] In order to solve the problem that a test rod of one length can only calibrate products of the same length, the present invention provides a coaxiality calibration tool and a coaxiality calibration method.

[0004] According to the first aspect, an embodiment provides a coaxiality calibration tool, comprising: a core shaft, a sleeve shaft and an elastic reset member;

[0005] The sleeve shaft is provided with an inner cavity, the mandrel cooperates with the inner cavity of the sleeve shaft, and the mandrel can slide in the inner cavity of the sleeve shaft to calibrate products of different sizes; the front end of the mandrel has a first abutment portion, and the rear end of the sleeve shaft has a second abutment portion, and the first abutment portion and the second abutment portion are used to cooperate with the calibrated product;

[0006] The elastic reset member acts on the core shaft to drive the core shaft to reset.

[0007] In one embodiment, the first abutting portion is a tapered hole surface or a frustum.

[0008] In one embodiment, the second abutting portion is a tapered hole surface or a frustum.

[0009] In one embodiment, the core shaft is a stepped shaft, which includes a first shaft segment, a second shaft segment and a third shaft segment, the shaft diameter of the second shaft segment is larger than the shaft diameter of the first shaft segment and the shaft diameter of the third shaft segment; the second shaft segment cooperates with the inner cavity of the sleeve shaft, and the second shaft segment can slide in the inner cavity of the sleeve shaft; the first abutment portion is arranged at the front end of the first shaft segment, and the first abutment portion is used to cooperate with the calibrated product.

[0010] In one embodiment, it also includes: a baffle; the baffle is installed at the front end of the sleeve shaft, and is used to prevent the core shaft from sliding out of the inner cavity of the sleeve shaft; a through hole is provided on the baffle, and the first shaft segment passes through the through hole; the second shaft segment is located in the inner cavity of the sleeve shaft, and the outer diameter of the second shaft segment is larger than the aperture of the through hole, so as to prevent the second shaft segment from escaping from the inner cavity of the sleeve shaft.

[0011] In one embodiment, the baffle is threadedly connected to the sleeve shaft.

[0012] In one embodiment, the elastic reset member is a compression spring; the compression spring is sleeved on the third shaft segment; when the core shaft slides into the inner cavity of the sleeve shaft, the compression spring is compressed, and vice versa, the compression spring rebounds to reset the core shaft.

[0013] In one embodiment, the coaxiality L of the first abutting portion and the second abutting portion is calculated by the following formula: L=L1+L4+(H1 / H2+0.5)*L2.

[0014] In one embodiment, L1=0.004 mm, L2=0.029 mm, L4=0.004 mm, H1=40 mm, H2=42 mm, and substituting them into the calculation formula, the coaxiality L of the first abutting portion and the second abutting portion is calculated to be 0.05 mm.

[0015] According to the second aspect, an embodiment provides a coaxiality calibration method, which uses the coaxiality calibration tool as described in any embodiment of the present application, including:

[0016] Matching the abutment portion at one end of the coaxiality calibration tool with one end of the product to be calibrated;

[0017] The abutment portion at the other end of the coaxiality calibration tool is matched with the other end of the calibrated product. If they can be matched normally, the coaxiality of the calibrated product meets the requirements. Otherwise, the coaxiality of the calibrated product does not meet the requirements.

[0018] According to the coaxiality calibration tool of the above embodiment, since its length is retractable, it can calibrate products of different lengths within the range of the retractable stroke, thereby greatly improving the scope of application and use efficiency of the tool. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of the structure of a coaxiality calibration tool in an embodiment;

[0020] Figure 2 A schematic diagram of dimension marking of a coaxiality calibration tool in an embodiment;

[0021] Figure 3 A dimension chain diagram of a coaxiality calibration tool in one embodiment;

[0022] Figure 4 A schematic diagram of the working state of a coaxiality calibration tool in an embodiment. DETAILED DESCRIPTION

[0023] The present invention is further described in detail below by specific embodiments in conjunction with the accompanying drawings. Wherein similar elements in different embodiments adopt associated similar element numbers. In the following embodiments, many detailed descriptions are for making the present application better understood. However, those skilled in the art can easily recognize that some features can be omitted in different situations, or can be replaced by other elements, materials, methods. In some cases, some operations related to the present application are not shown or described in the specification, this is to avoid the core part of the present application being overwhelmed by too much description, and for those skilled in the art, it is not necessary to describe these related operations in detail, and they can fully understand the related operations according to the description in the specification and the general technical knowledge in the art.

[0024] In addition, the features, operations or characteristics described in the specification can be combined in any appropriate manner to form various implementations. At the same time, the steps or actions in the method description can also be interchanged or adjusted in a manner that is obvious to those skilled in the art. Therefore, the various sequences in the specification and the drawings are only for the purpose of clearly describing a certain embodiment and are not meant to be a required sequence, unless otherwise specified that a certain sequence must be followed.

[0025] The serial numbers of the components in this document, such as "first", "second", etc., are only used to distinguish the objects described and do not have any order or technical meaning. The "connection" and "coupling" mentioned in this application, unless otherwise specified, include direct and indirect connections (couplings).

[0026] In the embodiment of the present invention, the length of the coaxiality calibration tool is retractable, and both ends are abutment parts, so products of different lengths can be calibrated. There is no matching gap between the abutment parts and the product, thereby improving the calibration accuracy.

[0027] Embodiment 1:

[0028] Please refer to Figure 1 In one embodiment of the present application, a coaxiality calibration tool is provided, comprising a core shaft 1, a sleeve shaft 2 and an elastic reset member. An inner cavity is provided on the sleeve shaft 2, and the core shaft 1 cooperates with the inner cavity of the sleeve shaft 2. The core shaft 1 can slide in the inner cavity of the sleeve shaft 2. Within the sliding stroke, the coaxiality calibration tool can calibrate products of different sizes. The elastic reset member is installed in the inner cavity of the sleeve shaft 2, and acts on the core shaft 1 to drive the core shaft 1 to reset. In order to ensure that there is no matching gap between the two ends of the coaxiality calibration tool and the calibrated product, a first abutment portion 101 is provided at the front end of the core shaft 1, and a second abutment portion 201 is provided at the rear end of the sleeve shaft 2. The contact end of the core shaft 1 with the calibrated product is the front end of the core shaft 1, and the contact end of the sleeve shaft 2 with the calibrated product is the rear end of the sleeve shaft 2.

[0029] In one embodiment, the mandrel 1 is a stepped shaft, including a first shaft section 11, a second shaft section 12 and a third shaft section 13. The second shaft section 12 of the mandrel 1 cooperates with the inner cavity of the sleeve 2, and the second shaft section 12 can slide in the inner cavity of the sleeve 2. The first abutment portion 101 is provided at the front end of the first shaft section 11, and is used to cooperate with the calibrated product. In order to prevent the mandrel 1 from sliding out of the inner cavity of the sleeve 2, a baffle 3 is provided at the front end of the sleeve 2. A through hole is provided on the baffle 3, and the first shaft section 11 of the mandrel 1 can extend from the through hole. The second shaft section 12 is located in the inner cavity of the sleeve 2. The outer diameter of the second shaft section 12 is larger than the aperture of the through hole on the baffle. The second shaft section 12 will be blocked by the baffle 3 to prevent the second shaft section 12 from escaping from the inner cavity of the sleeve 2. The baffle 3 is fixedly connected to the sleeve 2, and the connection method includes fixed connection methods such as threaded connection, compression and buckle. In one embodiment, the elastic reset member is a compression spring 4. When the core shaft 1 slides into the inner cavity of the sleeve shaft 2, the compression spring 4 is compressed. Conversely, the compression spring 4 rebounds to reset the core shaft 1, that is, the shoulder of the second shaft section 12 of the core shaft 1 is pressed against the baffle 3. When the calibration tool is working, the pressure of the compression spring 4 enables the abutment of the calibration tool to fit more tightly with the calibrated product.

[0030] In order for the coaxiality calibration tool to be used normally, the coaxiality of the abutting parts at both ends of the calibration tool needs to meet the usage requirements.

[0031] Please refer to Figure 2 and Figure 3 In one embodiment, the factors affecting the coaxiality L of the first abutting portion 101 and the second abutting portion 201 are: the coaxiality L1 between the second abutting portion 201 and the inner cavity of the sleeve shaft; the matching clearance L2 between the core shaft 1 and the sleeve shaft 2; the coaxiality L4 between the first shaft section 11 of the core shaft 1 and the second shaft section 12 of the core shaft 1. The core shaft 1 is floatingly fitted in the inner cavity of the sleeve shaft 2 by the compression spring 4. The core shaft 1 has the risk of tilting. The length of the core shaft 1 and the matching length of the inner cavity of the core shaft 1 and the sleeve shaft 2 will affect the tilt degree L3 of the core shaft. This factor will also affect the coaxiality L of the first abutting portion 101 and the second abutting portion 201. Figure 3 From the dimension chain diagram shown, we can see that L is a closed loop, L1, L3, L4 are component loops, and all are increasing loops. From the dimension chain calculation, we can get:

[0032] L=L1+L3+L4 (1)

[0033] From the linear relationship, we can get:

[0034] L3=L2 / 2+x (2)

[0035] From the relationship between similar triangles, we can get:

[0036] L2 / H2=x / H1 (3)

[0037] By combining equations (1), (2) and (3), we can obtain the calculation formula for the coaxiality L of the first abutting portion 101 and the second abutting portion 201:

[0038] L=L1+L4+(H1 / H2+0.5)*L2 (4)

[0039] In the formula, L1 is the coaxiality between the second abutment portion 201 and the inner cavity of the sleeve shaft 2; L2 is the fitting clearance between the core shaft 1 and the sleeve shaft 2; L4 is the coaxiality between the first shaft segment 11 of the core shaft 1 and the second shaft segment 12 of the core shaft 1; H1 is the length of the first shaft segment 11 of the core shaft 1; H2 is the fitting length of the inner cavity of the core shaft 1 and the sleeve shaft 2.

[0040] By considering the actual application situation, processing level and cost factors, the values ​​of L1, L2, L4, H1 and H2 can be adjusted so that the coaxiality L of the first abutting portion 101 and the second abutting portion 201 meets the use requirements.

[0041] In one embodiment, according to the design requirements of the coaxiality calibration tool, H1=40mm, H2=42mm are taken, and the mechanical design manual is consulted to take the 6th level accuracy, so L1=L4=0.004mm. The core shaft 1 and the sleeve shaft 2 are matched with H7 / h6, and the basic size is 12mm, so L2=0.029mm. Substituting the above parameters into formula (4), it is calculated that L=0.05mm, and the calibration accuracy of the calibration tool is 2L=Φ0.1mm, that is, the coaxiality of the calibrated product can also reach the accuracy of Φ0.1mm.

[0042] According to different usage requirements, the first abutment portion 101 and the second abutment portion 201 can be designed as a frustum or a conical hole surface. If the two ends of the calibrated product are hole surfaces, the first abutment portion 101 and the second abutment portion 201 are designed as a frustum. If the two ends of the calibrated product are axial surfaces, the first abutment portion 101 and the second abutment portion 201 are designed as conical hole surfaces. If one end of the calibrated product is a hole surface and the other end is an axial surface, the first abutment portion 101 and the second abutment portion 201 are designed as a frustum and a conical hole surface respectively.

[0043] Please refer to Figure 4 When using the coaxiality calibration tool in one embodiment of the present application for calibration, first mate the abutment at one end of the coaxiality calibration tool with one end of the product to be calibrated, and then mate the abutment at the other end of the coaxiality calibration tool with the other end of the product to be calibrated. If they can be matched normally, the coaxiality of the product to be calibrated meets the requirements, otherwise, the coaxiality of the product to be calibrated does not meet the requirements. Under the elastic force of the compression spring 4, the first abutment portion 101 and the second abutment portion 102 will tightly mate with the hole surface or the shaft surface of the product to be calibrated, thereby eliminating the matching clearance and ensuring the accuracy of the calibration. At the same time, the core shaft 1 can slide in the inner cavity of the sleeve shaft 2, and products of different lengths H can be calibrated within the range of the sliding stroke.

[0044] The coaxiality calibration tool according to the above embodiment has a telescopic structure, which can adjust the length of the calibration tool, has abutment parts at both ends and a compression spring in the middle, and can calibrate products of different sizes within the range of the telescopic stroke, thereby greatly improving the application scope and use efficiency of the calibration tool. The abutment parts at both ends can tightly fit with the hole surface or shaft surface of the calibrated product under the elastic force of the compression spring, leaving no fitting gap, thereby improving the calibration accuracy.

[0045] The above specific examples are used to illustrate the present invention, which is only used to help understand the present invention and is not intended to limit the present invention. For those skilled in the art, according to the concept of the present invention, some simple deductions, modifications or substitutions can be made.

Claims

1. A coaxiality calibration tool, characterized in that: include: Mandrel, sleeve and elastic return member; The sleeve shaft is provided with an inner cavity, and the core shaft is a stepped shaft, which includes a first shaft segment, a second shaft segment and a third shaft segment, the shaft diameter of the second shaft segment is larger than the shaft diameters of the first shaft segment and the third shaft segment, the second shaft segment cooperates with the inner cavity of the sleeve shaft, and the second shaft segment can slide in the inner cavity of the sleeve shaft to calibrate products of different sizes; the front end of the first shaft segment has a first abutment portion, and the rear end of the sleeve shaft has a second abutment portion, and the first abutment portion and the second abutment portion are used to cooperate with the calibrated product; The elastic reset member is a compression spring; the compression spring is sleeved on the third shaft segment; when the core shaft slides into the inner cavity of the sleeve shaft, the compression spring is compressed, and vice versa, the compression spring rebounds to reset the core shaft; The first abutting portion is a tapered hole surface or a frustum; the second abutting portion is a tapered hole surface or a frustum; The coaxiality L of the first abutting portion and the second abutting portion is calculated by the following formula: L=L1+L4+(H1 / H2+0.5)*L2; In the formula, L1 is the coaxiality between the second abutment portion and the inner cavity of the sleeve shaft; L2 is the fitting clearance between the core shaft and the sleeve shaft; L4 is the coaxiality between the first shaft segment and the second shaft segment; H1 is the length of the first shaft segment; H2 is the fitting length between the core shaft and the inner cavity of the sleeve shaft.

2. The coaxiality calibration tool according to claim 1, characterized in that: Also includes: Baffles; The baffle is installed at the front end of the sleeve shaft to prevent the core shaft from sliding out of the inner cavity of the sleeve shaft; The baffle is provided with a through hole, and the first shaft segment passes through the through hole; the second shaft segment is located in the inner cavity of the sleeve shaft, and the outer diameter of the second shaft segment is larger than the aperture of the through hole to prevent the second shaft segment from escaping from the inner cavity of the sleeve shaft.

3. The coaxiality calibration tool according to claim 2, characterized in that: The baffle is threadedly connected to the sleeve shaft.

4. The coaxiality calibration tool according to claim 1, characterized in that: The L1=0.004mm, the L2=0.029mm, the L4=0.004mm, the H1=40mm, the H2=42mm are substituted into the calculation formula, and the coaxiality L=0.05mm between the first abutting portion and the second abutting portion is calculated.

5. A coaxiality calibration method, characterized in that: A coaxiality calibration tool as claimed in any one of claims 1 to 4, comprising: Matching the abutment portion at one end of the coaxiality calibration tool with one end of the product to be calibrated; The abutment portion at the other end of the coaxiality calibration tool is matched with the other end of the calibrated product. If they can be matched normally, the coaxiality of the calibrated product meets the requirements. Otherwise, the coaxiality of the calibrated product does not meet the requirements.

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