Detection tool for rapidly detecting relative positions of pin hole pair centers on conical end face of workpiece

Abstract

The utility model belongs to the technical field of machining detection, and particularly relates to a detection tool for rapidly detecting the relative position of a workpiece conical end face pin hole pair center, one end or two ends of a workpiece are conical surfaces, and the detection tool is composed of a combined taper sleeve and a go-no go gauge. The combined taper sleeve is formed by assembling a reference inner hole ring sleeve and an inner taper sleeve arranged in the reference inner hole ring sleeve in an interference fit mode. The go-no go gauge is composed of a go end detection boss and a no-go end detection boss which are connected, the radius of the circumcircle of the go end detection boss is the minimum tolerance distance from the pin hole of the workpiece to the inner hole wall of the reference inner hole ring sleeve, and the radius of the circumcircle of the no-go end detection boss is the maximum tolerance distance from the pin hole of the workpiece to the inner hole wall of the reference inner hole ring sleeve. The center positions of the non-connection ends of the go end detection boss and the no-go end detection boss are respectively provided with a positioning pin which can be clamped into a pin hole of a workpiece and can rotate freely. According to the scheme, the detection tool is convenient and simple in detection process, high in detection speed and capable of meeting the requirement for rapid and large-scale detection.

Description

Technical Field

[0001] The utility model belongs to the technical field of mechanical processing detection, in particular to a detection tool for quickly detecting the relative position of a pin hole on a conical end face of a workpiece to a center. Background Art

[0002] Camshafts are critical components in engine transmission systems. Some camshafts feature a tapered surface at one or both ends, with pin holes at the tapered ends. These pin holes typically have high requirements for the relative position of the cone center. During the manufacturing process, the relative position of the pin holes to the cone center often requires online inspection for quality control. Common existing methods include using a three-dimensional coordinate measuring machine (CMM), a combination of a plate, V-blocks, graded pins, and a lever gauge, or a camshaft measuring machine combined with a lever gauge. Inspection using a plate, V-blocks, graded pins, and a lever gauge is cumbersome and requires high personnel requirements. This method is not suitable for products with strict positioning requirements. Inspection using a camshaft measuring machine or a CMM requires the workpiece to be transported to a dedicated, air-conditioned facility, which is time-consuming and slow. In fast-paced production, this approach hinders effective real-time quality control, hinders production efficiency, and fails to meet the requirements of large-scale continuous production. None of these three methods are suitable for large-scale continuous production. Summary of the Invention

[0003] In order to solve the deficiencies of the prior art, the purpose of the utility model is to provide a checking fixture for quickly checking the relative position of the pin hole on the conical end face of a workpiece to the center, which has a convenient and simple inspection process, a fast inspection speed and meets the requirements of rapid and large-scale inspection.

[0004] The technical solution adopted is: a gauge for quickly detecting the relative position of the pin hole of the conical end face of a workpiece to the center, one or both ends of the workpiece are conical surfaces, and the gauge consists of a combined taper sleeve and a go / no-go gauge; the combined taper sleeve consists of a reference inner hole ring sleeve and an inner taper sleeve arranged inside the reference inner hole ring sleeve, and the reference inner hole ring sleeve and the inner taper sleeve are assembled with an interference fit. By combining the taper sleeve, the taper surface reference is converted into the inner hole wall reference, and the distance between the pin hole and the center of the taper surface is converted into the distance between the pin hole and the inner hole wall of the reference inner hole ring sleeve, completing the reference conversion and facilitating detection; the thickness of the reference inner hole ring sleeve is greater than that of the inner taper sleeve, the taper of the inner taper sleeve is consistent with the taper of the workpiece's taper surface, and the small end opening size of the inner taper sleeve is greater than the small end size of the workpiece's taper surface;

[0005] The go / no-go gauge consists of a connected through-end detection boss and a stop-end detection boss. The circumscribed circle radius of the through-end detection boss is the minimum tolerance distance from the pin hole of the workpiece to the inner hole wall of the reference inner hole ring sleeve, and the circumscribed circle radius of the stop-end detection boss is the maximum tolerance distance from the pin hole of the workpiece to the inner hole wall of the reference inner hole ring sleeve. A locating pin is respectively provided at the center position of the non-connecting end of the through-end detection boss and the stop-end detection boss. The diameter of the locating pin matches the pin hole size of the workpiece so that the locating pin can be stuck in the pin hole and rotate freely.

[0006] Furthermore, the workpiece is a camshaft having a tapered end and a pin hole, or a part having a tapered surface and a pin hole.

[0007] Moreover, the combined taper sleeve is sleeved outside the workpiece when the workpiece is inspected, and the reference inner hole ring sleeve protrudes from the end face of the workpiece, and the end face of the workpiece protrudes from the inner taper sleeve.

[0008] Moreover, the base inner hole ring sleeve is 8 to 15 mm thicker than the inner cone sleeve.

[0009] Moreover, the connecting parts of the through-end detection boss and the stop-end detection boss are both connecting columns with threaded blind holes, and the connecting columns of the two are connected by screws.

[0010] Furthermore, the through-end detection boss and the stop-end detection boss have different shapes.

[0011] Moreover, the cross-sectional shape of the through-end detection boss is a circle minus a small half arc on one side, that is, a sector with a central angle greater than 180 degrees; the cross-sectional shape of the stop-end detection boss is a circle minus a small half arc on both sides.

[0012] Compared with the existing technology, the beneficial effects of this technical solution are:

[0013] 1. This gauge consists of a combined taper sleeve and a go / no-go gauge. The combined taper sleeve is composed of a reference inner bore ring sleeve and an inner taper sleeve positioned within the reference inner bore ring sleeve. The go / no-go gauge consists of a connected through-end detection boss and a stop-end detection boss. The radii of the through-end detection boss and the stop-end detection boss are designed based on the relative position requirements of the standard workpiece's conical end face pin hole to the center. Specifically, the minimum tolerance distance from the standard workpiece's conical end face pin hole to the inner wall of the reference inner bore ring sleeve is equal to the circumscribed radius of the through-end detection boss, and the maximum tolerance distance from the standard workpiece's conical end face pin hole to the inner wall of the reference inner bore ring sleeve is equal to the circumscribed radius of the stop-end detection boss. During testing, insert the through-end and stop-end locating pins into the pin holes of the workpiece to be tested respectively. If the through-end rotates freely and the stop-end cannot rotate, it can be quickly judged that the workpiece to be tested is qualified; if the through-end cannot rotate freely, it means that the pin hole of the workpiece to be tested is too far from the center of the cone and is unqualified; if the stop-end can rotate freely, it means that the pin hole of the workpiece to be tested is too close to the center of the cone and is unqualified.

[0014] 2. This inspection fixture is suitable for large-scale continuous production. The corresponding through-end detection boss and stop-end detection boss can be selected according to the requirements of different workpieces. It can adapt to workpieces with different conical end face sizes and has high detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the planar structure of the through-end detection boss, the stop-end detection boss, and the screw in the embodiment. The upper left figure is a front view of the through-end detection boss, the lower left figure is a top view of the through-end detection boss, the upper middle figure is a front view of the stop-end detection boss, the lower middle figure is a top view of the stop-end detection boss, and the right figure is a front view of the screw.

[0016] Figure 2 1. It is a schematic diagram of the assembly of the go / no-go gauge structure of the embodiment, including a go / no-go detection boss, a stop / no-go detection boss and a screw;

[0017] Figure 3 The left picture is a schematic diagram of the reference inner hole ring sleeve and the inner tapered sleeve, and the right picture is a combined tapered sleeve formed by assembling the reference inner hole ring sleeve and the inner tapered sleeve with an interference fit;

[0018] Figure 4 It is a structural diagram of the workpiece;

[0019] Figure 5 3 is a schematic structural diagram of the embodiment when the inspection fixture is assembled on the workpiece to be tested.

[0020] Explanation of the reference numerals: 1-through-end detection boss; 2-stop-end detection boss; 3-connecting column with threaded blind hole; 4-cross section of through-end detection boss; 5-locating pin; 6-cross section of stop-end detection boss; 7-screw; 8-inner tapered sleeve; 9-reference inner hole ring sleeve; 10-combined tapered sleeve; 11-workpiece to be measured; 12-pin hole; 13-conical end of the workpiece to be measured. DETAILED DESCRIPTION

[0021] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. The present invention is not limited to the following embodiments.

[0022] A checking fixture for quickly detecting the relative position of a pin hole on a tapered end face of a workpiece to the center. The workpiece is a camshaft with a tapered end and a pin hole, or other parts with a tapered surface and a pin hole. The checking fixture consists of a combined taper sleeve and a go / no-go gauge. The combined taper sleeve consists of a reference inner hole ring sleeve and an inner taper sleeve arranged inside the reference inner hole ring sleeve. The go / no-go gauge consists of a connected through-end detection boss and a stop-end detection boss.

[0023] like Figure 1 and Figure 2As shown, the go / no-go gauge consists of a connected through-end detection boss 1 and a stop-end detection boss 2. To facilitate differentiation, the through-end detection boss and the stop-end detection boss are typically manufactured in different shapes. In this embodiment, the through-end detection boss has a cross-section 4 that is a circular section with a small semi-arc removed from one side, i.e., a sector with a central angle greater than 180 degrees; the stop-end detection boss has a cross-section 6 that is a circular section with small semi-arcs removed from both sides. Different shapes and sizes of through-end detection bosses and stop-end detection bosses can be selected to accommodate workpieces with varying conical end face dimensions, depending on the workpiece requirements.

[0024] In order to allow the two to be manufactured separately and matched with each other, the connecting parts of the through-end detection boss and the stop-end detection boss are both connecting columns 3 with threaded blind holes, and the connecting columns of the two are connected by a screw 7; the center position of the non-connecting end of the through-end detection boss and the stop-end detection boss is respectively provided with a locating pin 5, and the through-end detection boss and the locating pins and connecting columns at both ends are essentially an integrated structure, and the stop-end detection boss and the locating pins and connecting columns at both ends are essentially an integrated structure, and the diameter of the locating pin matches the pin hole size of the workpiece so that the locating pin can be stuck in the pin hole and rotate freely.

[0025] like Figure 3 As shown, the combined taper sleeve 10 is composed of a reference inner hole ring sleeve 9 and an inner taper sleeve 8 arranged inside the reference inner hole ring sleeve, and the reference inner hole ring sleeve and the inner taper sleeve are assembled with interference fit, the thickness of the reference inner hole ring sleeve is greater than the thickness of the inner taper sleeve, the taper of the inner taper sleeve is consistent with the taper of the cone surface of the workpiece, and the small head opening size of the inner taper sleeve is larger than the small end size of the cone surface of the workpiece, so that the combined taper sleeve can be put on the outside of the workpiece for detection.

[0026] Moreover, the reference inner hole ring is usually 8 to 15 mm thicker than the inner tapered sleeve, so that when the combined tapered sleeve is sleeved outside the workpiece during inspection, the reference inner hole ring protrudes from the workpiece end face, and the workpiece end face protrudes from the inner tapered sleeve.

[0027] The structural diagrams of the standard workpiece and the workpiece to be measured 11 are as follows Figure 4 As shown, the difference is that if the workpiece to be tested is unqualified, the position of its pin hole 12 is incorrect.

[0028] Since the diameters of the through-end detection boss and the stop-end detection boss are designed based on the relative position requirements of the standard workpiece's conical end face pin hole to the center (the specific design is: the minimum tolerance distance from the standard workpiece's conical end face pin hole to the inner hole wall of the reference inner hole ring is equal to the circumscribed circle size of the through-end detection boss, and the maximum tolerance distance from the standard workpiece's conical end face pin hole to the inner hole wall of the reference inner hole ring is equal to the circumscribed circle size of the stop-end detection boss), the method for detecting the workpiece to be tested is as follows:

[0029] like Figure 5As shown, first, insert the combined taper sleeve 10 into the tapered end 13 of the workpiece to be tested, with the combined taper sleeve firmly against the workpiece's tapered surface. Then, insert the positioning pin 5 of the through-end detection boss 1 into the pin hole 12 of the workpiece 11 to be tested. The gauge is rotated until the through-end detection boss 1 can rotate freely without interfering with the inner hole wall of the reference inner hole ring sleeve 9. Finally, insert the stop-end detection boss 2 into the pin hole 12 of the workpiece 11 to be tested. If the stop-end detection boss 2 cannot rotate freely, the relative position of the workpiece pin hole 12 to the center is determined to be qualified. If the through-end detection boss 1 cannot rotate freely or the stop-end detection boss can rotate freely, the position of the workpiece pin hole 12 to be tested is determined to be unqualified, and the inspection is complete.

[0030] Compared with the existing technology, the beneficial effects of this technical solution are:

[0031] 1. This gauge consists of a combined taper sleeve and a go / no-go gauge. The combined taper sleeve is composed of a reference inner bore ring sleeve and an inner taper sleeve positioned within the reference inner bore ring sleeve. The go / no-go gauge consists of a connected through-end detection boss and a stop-end detection boss. The radii of the through-end detection boss and the stop-end detection boss are designed based on the relative position requirements of the standard workpiece's conical end face pin hole to the center. Specifically, the minimum tolerance distance from the standard workpiece's conical end face pin hole to the inner wall of the reference inner bore ring sleeve is equal to the circumscribed radius of the through-end detection boss, and the maximum tolerance distance from the standard workpiece's conical end face pin hole to the inner wall of the reference inner bore ring sleeve is equal to the circumscribed radius of the stop-end detection boss. During testing, insert the through-end and stop-end locating pins into the pin holes of the workpiece to be tested respectively. If the through-end rotates freely and the stop-end cannot rotate, it can be quickly judged that the workpiece to be tested is qualified; if the through-end cannot rotate freely, it means that the pin hole of the workpiece to be tested is too far from the center of the cone and is unqualified; if the stop-end can rotate freely, it means that the pin hole of the workpiece to be tested is too close to the center of the cone and is unqualified.

[0032] 2. This inspection fixture is suitable for large-scale continuous production. The corresponding through-end detection boss and stop-end detection boss can be selected according to the requirements of different workpieces. It can adapt to workpieces with different conical end face sizes and has high detection accuracy.

Claims

1. A test fixture for quickly detecting the relative position of a pin hole on a conical end face of a workpiece to its center, wherein one or both ends of the workpiece are conical, and wherein: The inspection fixture consists of a combined taper sleeve and a go / no-go gauge; the combined taper sleeve consists of a reference inner hole ring sleeve and an inner taper sleeve arranged inside the reference inner hole ring sleeve, and the reference inner hole ring sleeve and the inner taper sleeve are assembled with an interference fit, the thickness of the reference inner hole ring sleeve is greater than the thickness of the inner taper sleeve, the taper of the inner taper sleeve is consistent with the taper of the workpiece, and the small end opening size of the inner taper sleeve is larger than the small end size of the workpiece's taper surface; The go / no-go gauge consists of a connected through-end detection boss and a stop-end detection boss. The circumscribed circle radius of the through-end detection boss is the minimum tolerance distance from the pin hole of the workpiece to the inner hole wall of the reference inner hole ring sleeve, and the circumscribed circle radius of the stop-end detection boss is the maximum tolerance distance from the pin hole of the workpiece to the inner hole wall of the reference inner hole ring sleeve. A locating pin is respectively provided at the center position of the non-connecting end of the through-end detection boss and the stop-end detection boss. The diameter of the locating pin matches the pin hole size of the workpiece so that the locating pin can be stuck in the pin hole and rotate freely.

2. A checking fixture for quickly checking the relative position of a pin hole on a conical end face of a workpiece to its center according to claim 1, characterized in that: The workpiece is a camshaft with a tapered end and a pin hole, or a part with a tapered surface and a pin hole.

3. A checking fixture for quickly checking the relative position of a pin hole on a conical end face of a workpiece to its center according to claim 1, characterized in that: The combined taper sleeve is sleeved outside the workpiece when the workpiece is inspected, and the reference inner hole ring sleeve protrudes from the end face of the workpiece, and the end face of the workpiece protrudes from the inner taper sleeve.

4. A checking fixture for quickly checking the relative position of a pin hole on a conical end face of a workpiece to its center according to claim 1, characterized in that: The base inner hole ring sleeve is 8 to 15 mm thicker than the inner cone sleeve.

5. A checking fixture for quickly checking the relative position of a pin hole on a conical end face of a workpiece to its center according to claim 1, characterized in that: The connecting parts of the through-end detection boss and the stop-end detection boss are both connecting columns with threaded blind holes, and the connecting columns of the two are connected by screws.

6. A checking fixture for quickly checking the relative position of a pin hole on a conical end face of a workpiece to its center according to claim 1, characterized in that: The through-end detection boss and the stop-end detection boss have different shapes.

7. A checking fixture for quickly checking the relative position of a pin hole on a conical end face of a workpiece to its center according to claim 6, characterized in that: The cross-sectional shape of the through-end detection boss is a circle minus a small half-arc on one side, that is, a sector with a central angle greater than 180 degrees; the cross-sectional shape of the stop-end detection boss is a circle minus a small half-arc on both sides.

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