A deep hole taper thread addendum measuring device and a measuring method thereof

Abstract

The application provides a deep hole taper thread tooth top diameter measuring device and a measuring method thereof, and belongs to the technical field of deep hole measurement. The measuring device comprises a sleeve, the top end of the sleeve is provided with an outer edge, the sleeve has a certain taper, and the sleeve can be placed in parallel in a deep hole taper thread workpiece; and a diameter gauge, which is in close contact with the bottom end of the sleeve and the thread tooth top of the deep hole taper thread workpiece respectively, so that the thread tooth top diameter can be directly measured. The device does not need positioning, and the diameter gauge can be in close contact with the bottom end of the sleeve on both sides; compared with a traditional middle diameter gauge, data of the device does not need to be transmitted through a standard block, but can be directly read through the diameter gauge, so that the device is convenient and easy to operate, and has high measurement precision.

Description

Technical Field

[0001] This invention belongs to the field of deep hole measurement technology, specifically relating to a device and method for measuring the tooth tip diameter of a deep hole tapered thread. Background Technology

[0002] Currently, when measuring the thread tip diameter of tapered thread workpieces, a pitch diameter gauge is used. The measurement process is as follows: Figure 1 As shown, before measurement, the pitch diameter value needs to be calibrated using axial standard block B and pitch diameter setting standard block A. First, loosen the fastening screws so that the upper arm can slide in the slide. Place standard block B outside the probe C and the upper bushing, and adjust the upper arm so that the distance between the probe and the bushing is equal to the value of standard block B. Tighten the screws. Repeat the same steps to adjust the distance between the probe D and the lower bushing using standard block B. After fixing the axial position, fix standard block A and probe D. Move standard block B back and forth, but do not exceed the width of probe C. At the same time, find the rotation point of the indicator. After finding the rotation point, adjust the indicator to set the rotation point to zero and tighten the fastening screws. Repeat this process several times to adjust the standard tooth tip diameter.

[0003] Currently, engineering designers frequently design a type of workpiece where the thread cross-section is located deep within the workpiece's inner wall, such as... Figure 2 .

[0004] The actual end face of the thread is a certain distance H from the end face A′ of the workpiece. At this time, the measuring anvil F cannot be flat against the end face of the thread for measurement. The traditional solution is to customize measuring rods G and B for calibration, and measure with the A′ face as the reference. However, this measurement method has the following problems: (1) For measuring the end face of the threaded workpiece in a deep hole, it is not economical to purchase a large-size pitch diameter gauge; (2) The measurement process is transmitted to the indicator (C in the figure) through the measuring head (C and D in the figure), which has errors; (3) The measurement operation is relatively complicated and inconvenient.

[0005] Chinese patent publication CN208296727U discloses a fixture structure for measuring the tip diameter of odd-numbered gears, including a base plate, a measuring seat, a dial indicator, and a standard block, which is mainly used to measure the tip diameter of odd-numbered gears formed by powder metallurgy.

[0006] The paper "Mechanical Engineer" (Issue 2, 1992, pp. 35-36) discloses a method for measuring the tooth tip diameter of ordinary threads using a three-needle method. This method requires the measuring needle to always be in tangential contact with the tooth profile surface. The tooth tip diameter can only be obtained by repeatedly calculating the equation between the measuring needle diameter and the thread tooth. Therefore, it cannot meet the measurement requirements of the tooth tip diameter of deep hole tapered threads. Furthermore, the measurement process is cumbersome and has a large error. Summary of the Invention

[0007] The purpose of this invention is to solve the problems existing in the prior art and provide a deep hole tapered thread tooth tip diameter measuring device and method, which is suitable for accurately and efficiently measuring the thread tooth tip diameter when calculating the thread pitch diameter of deep hole tapered thread workpieces.

[0008] This invention is achieved through the following technical solution:

[0009] In a first aspect, the present invention provides a deep hole taper thread tooth tip diameter measuring device, the measuring device comprising:

[0010] A sleeve, with an outer edge at the top and a taper, is placed parallel to the workpiece with a deep hole taper thread.

[0011] The diameter gauge is used to measure the thread tip diameter by fitting it against the bottom end of the sleeve and the thread tip of the deep-hole tapered threaded workpiece.

[0012] A further improvement of the present invention is that:

[0013] The sleeve is a circular metal component with an outer edge. The metal component is a metal sleeve with an outer edge at the top and a certain taper. It is placed parallel to the deep hole tapered thread workpiece, that is, the sleeve and the deep hole tapered thread workpiece are coaxial.

[0014] A further improvement of the present invention is that:

[0015] The outer diameter of the sleeve decreases from the top to the bottom, forming a taper. The taper of the sleeve is adapted to the thread taper of the deep hole tapered thread workpiece.

[0016] A further improvement of the present invention is that:

[0017] The sleeve length is half the thread depth of the deep-hole tapered thread workpiece, and the sleeve length is the distance from the lower end face of the outer edge to the bottom end face of the sleeve.

[0018] A further improvement of the present invention is that:

[0019] The diameter gauge includes a dial indicator, which is connected to a connecting rod and a sleeve rod, and the connecting rod and the sleeve rod are arranged opposite to each other;

[0020] A measuring rod is fitted inside the sleeve, and the measuring rod can move within the sleeve. The measuring rod is connected to the dial indicator via a transmission mechanism.

[0021] A further improvement of the present invention is that:

[0022] The measuring rod is equipped with a rack, and the measuring rod is connected to the gear on the dial indicator through the rack.

[0023] A further improvement of the present invention is that:

[0024] Both the connecting rod and the measuring rod have wedges at their ends, and the two wedges are rotatably connected to the ends of the connecting rod and the measuring rod, respectively.

[0025] A further improvement of the present invention is that:

[0026] The connection between the extension rod and the dial indicator is detachable.

[0027] In a second aspect, the present invention provides a method for measuring the tooth tip diameter of a deep-hole tapered thread, wherein the tooth tip diameter of the deep-hole tapered thread is measured using the aforementioned deep-hole tapered thread tooth tip diameter measuring device.

[0028] The method includes the following steps:

[0029] (1) First, insert the sleeve into the deep hole tapered thread workpiece so that the outer edge of the sleeve is completely matched with the upper edge of the deep hole tapered thread workpiece;

[0030] (2) Place the diameter gauge into the deep hole tapered thread workpiece, so that the wedges at both ends of the diameter gauge are in contact with the bottom end face of the sleeve and the thread tooth tip of the deep hole tapered thread workpiece, respectively.

[0031] (3) Measure the thread tooth tip diameter using a diameter gauge;

[0032] (4) Calculate the thread pitch diameter.

[0033] A further improvement of the present invention is that:

[0034] Step (4) involves obtaining the thread pitch diameter value E using the following formula. L :

[0035] E L =D L +2H

[0036] Among them, E L D is the thread pitch diameter. L H is the tooth tip diameter, and H is the distance from the tooth tip to the center line of the thread.

[0037] Compared with the prior art, the beneficial effects of the present invention are:

[0038] (1) Easy to operate and easy to use: The measuring device described in this invention does not require positioning; the diameter gauge can be attached to the bottom of the sleeve on both sides.

[0039] (2) Higher accuracy: Compared with the traditional mean diameter gauge, the measuring device of the present invention does not require data to be transmitted through a standard block, and the data can be read directly through the diameter gauge;

[0040] (3) Satisfying deep hole measurement: When measuring deep hole tapered thread workpieces, the measuring device of the present invention can complete the measurement of the tooth tip diameter of the thread by using a matching metal sleeve. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of an existing pitch gauge;

[0042] Figure 2 This is a schematic diagram of an API tapered threaded sleeve;

[0043] Figure 3 This is a structural diagram of the sleeve in the measuring device of the present invention;

[0044] Figure 4 This is a structural diagram of the diameter gauge in the measuring device of the present invention;

[0045] Figure 5 This is a cross-sectional view of the deep-hole tapered thread workpiece to be measured;

[0046] Figure 6 This is a schematic diagram of the measuring device of the present invention in use during measurement;

[0047] Figure 7 This is a schematic diagram of a deep hole tapered thread workpiece.

[0048] In the picture,

[0049] 1. Sleeve,

[0050] 2. Deep-hole tapered threaded workpieces,

[0051] 3. Diameter gauge,

[0052] 3-1. Dial gauge

[0053] 3-2, Connecting the pole,

[0054] 3-3, Sleeve,

[0055] 3-4. Measuring rod

[0056] 4. Tooth crest,

[0057] 5. Thread centerline. Detailed Implementation

[0058] The present invention will now be described in further detail with reference to the accompanying drawings:

[0059] This invention provides a device for measuring the tip diameter of deep-hole tapered threads, which is suitable for measuring the tip diameter of working teeth in deep-hole tapered threads. It is easy and lightweight to operate and has high measurement accuracy.

[0060] This invention provides a device for measuring the tooth tip diameter of deep hole tapered threads, the structure of which is illustrated below:

[0061]

Example 1

[0062] A device for measuring the tip diameter of a deep-hole tapered thread, comprising:

[0063] Sleeve 1, the top of sleeve 1 has an outer edge and a certain taper, and can be placed parallel inside deep hole tapered thread workpiece 2;

[0064] Diameter gauge 3 is fitted to the bottom end of sleeve 1 and the thread tip of deep hole tapered thread workpiece 2 respectively, and can directly measure the thread tip diameter.

[0065] When using, place the sleeve 1 into the deep hole tapered thread workpiece 2 of the matching size, so that the outer edge of the top of the sleeve 1 is completely matched with the upper edge of the deep hole tapered thread workpiece 2. Use a diameter gauge 3 at the bottom end of the sleeve 1 to press against the thread tooth tip and the bottom end face of the sleeve to measure the thread tooth tip diameter, and calculate the thread pitch diameter accordingly.

[0066]

Example 2

[0067] like Figure 3 As shown, sleeve 1 is a circular metal component with an outer edge. The metal component is a metal sleeve with an outer edge at the top and a certain taper. It can be placed parallel inside the deep hole tapered thread workpiece. That is to say, sleeve 1 is coaxial with the deep hole tapered thread workpiece 2. Sleeve 1 is fitted inside the deep hole tapered thread workpiece 2. The outer edge of sleeve 1 is attached to the upper end face of the deep hole tapered thread workpiece 2.

[0068] See Figure 3 The length of sleeve 1 is required to be such that its bottom end reaches the midpoint of the thread centerline of the deep-hole tapered thread workpiece 2. In other words, the length of sleeve 1 is half the depth of the threaded hole of the deep-hole tapered thread workpiece 2. The length of sleeve 1 is the distance from the lower end face of its outer edge to the bottom end face of the sleeve.

[0069] The outer diameter of the sleeve 1 decreases from the top to the bottom, forming a taper. The taper of the sleeve 1 is adapted to the thread taper of the deep hole taper threaded workpiece 2.

[0070] Various lengths and tapers of sleeves can be designed to suit different deep hole taper threaded workpieces. The most commonly used taper is 1:16. For large products larger than 16 inches, a taper of 1:12 is used. 1:4 and 1:6 are also possible, but are not commonly used.

[0071]

Example 3

[0072] Diameter gauge 3 is a gauge for measuring the diameter of the end face of an internal tapered hole, used to measure the tooth tip diameter. Its structure is as follows: Figure 4 As shown, the diameter gauge 3 includes a dial indicator 3-1, on which a connecting rod 3-2 and a sleeve rod 3-3 are connected, and the connecting rod 3-2 and the sleeve rod 3-3 are arranged opposite to each other. A measuring rod 3-4 is sleeved inside the sleeve rod 3-3 and the measuring rod can move inside the sleeve rod. The measuring rod 3-4 is connected to the dial indicator 3-1 by transmission.

[0073] The length of the measuring rod 3-4 is greater than the length of the sleeve rod 3-3. The measuring rod 3-4 is equipped with a rack. The measuring rod 3-4 is connected to the gear on the dial indicator 3-1 through the rack. The dial indicator 3-1 uses rack and gear transmission to convert the linear displacement of the measuring rod 3-4 into the angular displacement of the pointer. The measurement result can be read directly on the dial indicator 3-1.

[0074] Both the ends of the connecting rod 3-2 and the measuring rod 3-4 are provided with wedges, and the two wedges are rotatably connected to the ends of the connecting rod 3-2 and the measuring rod 3-4 respectively, so as to facilitate fitting against the inner wall of the deep hole tapered thread workpiece 2.

[0075] The connecting rod 3-2 and the dial indicator 3-1 are detachably connected. Preferably, the dial indicator 3-1 and the connecting rod 3-2 are connected by threads, so that the connecting rod 3-2 can be replaced according to the measurement length requirements. As a preferred embodiment, the dial indicator 3-1 is provided with a threaded hole, and the end of the connecting rod 3-2 away from the wedge is provided with a thread, and the thread matches the threaded hole to realize the threaded connection between the dial indicator 3-1 and the connecting rod 3-2. As a preferred embodiment, the dial indicator 3-1 is provided with a protrusion with an external thread, and the end of the connecting rod 3-2 away from the wedge is provided with a threaded hole, and the threaded hole matches the external thread to realize the threaded connection between the dial indicator 3-1 and the connecting rod 3-2.

[0076] Dial gauges are standard products and will not be described in detail here.

[0077] When measuring the thread tip diameter of a deep-hole tapered thread workpiece using a diameter gauge, two wedges are respectively engaged with the thread tip of the workpiece. A measurement result can then be directly read from the dial indicator. This measurement result is then added to the length to obtain the thread tip diameter of the deep-hole tapered thread.

[0078] The tip diameter of the deep hole tapered thread = the measurement result of the dial indicator + the length of the connecting rod.

[0079] This invention provides a device for measuring the tooth tip diameter of deep-hole tapered threads. When in use, as follows... Figure 6 As shown, first insert the sleeve into the deep hole tapered thread workpiece (see the structural diagram of the deep hole tapered thread workpiece as shown). Figure 5 As shown in the figure, make the outer edge of the sleeve completely fit with the upper edge of the deep hole tapered thread workpiece; then insert the diameter gauge, so that the wedges at both ends of the diameter gauge fit with the bottom end face of the sleeve and the thread tooth tip of the deep hole tapered thread workpiece respectively, and measure the thread tooth tip diameter through the diameter gauge.

[0080] The present invention provides a device for measuring the tooth tip diameter of deep hole tapered threads, which has the following characteristics:

[0081] (1) Easy to operate and easy to use: The measuring device described in this invention does not require positioning; the diameter gauge can be attached to the bottom of the sleeve on both sides.

[0082] (2) Higher accuracy: Compared with the traditional mean diameter gauge, the measuring device of the present invention does not require data to be transmitted through a standard block, and the data can be read directly through the diameter gauge;

[0083] (3) Satisfying deep hole measurement: When measuring deep hole tapered thread workpieces, the measuring device of the present invention can complete the measurement of the tooth tip diameter of the thread by using a matching metal sleeve.

[0084] This invention also provides a method for measuring the tip diameter of a deep-hole tapered thread. The method uses the aforementioned device for measuring the tip diameter of a deep-hole tapered thread. Specific embodiments of the measurement method are as follows:

[0085]

Example 4

[0086] The method specifically includes the following steps:

[0087] (1) First, put the sleeve 1 into the deep hole tapered thread workpiece 2, so that the outer edge of the sleeve 1 is completely matched with the upper edge of the deep hole tapered thread workpiece 2.

[0088] (2) Place the diameter gauge 3 into the deep hole tapered thread workpiece 2, so that the wedges at both ends of the diameter gauge are in contact with the bottom end face of the sleeve and the thread tooth tip of the deep hole tapered thread workpiece, respectively.

[0089] (3) Measure the thread tooth tip diameter using a diameter gauge;

[0090] Deep hole tapered thread tooth tip diameter = dial indicator measurement result + extension rod length

[0091] (4) Calculate the thread pitch diameter.

[0092] Step (4) involves obtaining the thread pitch diameter value E using the following formula. L :

[0093] E L =D L +2H

[0094] Among them, E L D is the thread pitch diameter. L H is the tooth tip diameter, and H is the distance from tooth tip 4 to thread centerline 5 (see [reference]). Figure 7 ).

[0095] Since the tooth height and the distance H from the tooth tip to the center line of the thread are both constant for each specification and model of thread.

[0096] The thread pitch diameter is defined as follows: taking the thread flank as a reference, the sum of the distance from the thread tip on the upper end face to the thread centerline 5 and the distance from the thread tip on the lower end face to the thread centerline 5, plus the thread tip diameter (i.e., the distance from the thread tip on the upper end face to the thread tip on the lower end face). Because the thread height and the pitch diameter are constant, the distances from the thread tips on the upper and lower end faces to the pitch diameter are also constant.

[0097] The following is a specific application example to further illustrate the method for measuring the tooth tip diameter of a deep hole tapered thread according to the present invention.

[0098]

Example 5

[0099] Taking API tapered internal thread (5 threads / inch) as an example, the specific measurement method is as follows:

[0100] (1) First, insert the sleeve into the API trapezoidal taper internal thread so that the outer edge of the sleeve is completely engaged with the upper edge of the API trapezoidal taper internal thread.

[0101] (2) Place the diameter gauge into the API trapezoidal taper internal thread, so that the wedges at both ends of the diameter gauge are in contact with the bottom end face of the sleeve and the thread tooth tip of the deep API trapezoidal taper internal thread, respectively.

[0102] (3) Measure the thread tooth tip diameter directly using a diameter gauge:

[0103] D L =Dial indicator measurement + extension rod length =177.8mm;

[0104] (4) Through formula E L =D L +2H is used to calculate the mean diameter of the API trapezoidal taper internal thread.

[0105] The distance H from the tooth tip to the thread centerline of the API trapezoidal taper internal thread is 0.031 mm. Therefore, the calculation process for its taper thread pitch diameter is as follows:

[0106] E L =177.8+2×0.031=177.862mm.

[0107] The present invention provides a method for measuring the tooth tip diameter of a deep-hole tapered thread, which is applicable to the calculation of the thread pitch diameter of a deep-hole tapered thread workpiece, and can accurately and efficiently complete the measurement of the thread tooth tip diameter.

[0108] It has the following characteristics:

[0109] (1) Easy to operate and easy to use: The measurement method described in this invention does not require positioning; the diameter gauge can be attached to the bottom of the sleeve on both sides.

[0110] (2) Higher accuracy: Compared with the traditional mean diameter gauge, the measurement method described in this invention does not require data to be transmitted through a standard block, and the data can be read directly through the diameter gauge;

[0111] (3) Satisfying deep hole measurement: When measuring deep hole tapered thread workpieces, the measurement method of the present invention can complete the measurement of the tooth tip diameter of the thread by using a matching metal sleeve.

[0112] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0113] In the description of this invention, unless otherwise stated, the terms "upper," "lower," "left," "right," "inner," "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0114] Finally, it should be noted that the above technical solution is only one embodiment of the present invention. For those skilled in the art, based on the application methods and principles disclosed in the present invention, it is easy to make various types of improvements or modifications, and not limited to the methods described in the above specific embodiments of the present invention. Therefore, the methods described above are only preferred and have no limiting significance.

Claims

1. A device for measuring the tip diameter of a deep-hole tapered thread, characterized in that, The measuring device includes: A sleeve, the top of which has an outer edge and a taper, is placed parallel to the inside of a deep-hole tapered threaded workpiece; A diameter gauge is used to measure the thread tip diameter by fitting it against the bottom end of the sleeve and the thread tip of the deep-hole tapered threaded workpiece, respectively. The sleeve is a circular metal component with an outer edge. The metal component is a metal sleeve with an outer edge at the top and a certain taper. It is placed parallel to the deep hole tapered thread workpiece, that is, the sleeve and the deep hole tapered thread workpiece are coaxial. The outer diameter of the sleeve decreases from the top to the bottom, forming a taper. The taper of the sleeve is adapted to the thread taper of the deep hole tapered thread workpiece. The length of the sleeve is half the thread depth of the deep hole tapered thread workpiece, and the length of the sleeve is the distance from the lower end face of the outer edge to the bottom end face of the sleeve. The diameter gauge includes a dial indicator, on which a connecting rod and a sleeve are connected, the connecting rod and the sleeve being arranged opposite to each other; a measuring rod is sleeved inside the sleeve, and the measuring rod can move within the sleeve, the measuring rod being connected to the dial indicator via a transmission; the measuring rod is provided with a rack, and the measuring rod is connected to a gear on the dial indicator via the rack; both the connecting rod and the measuring rod have wedges at their ends, and two wedges are rotatably connected to the ends of the connecting rod and the measuring rod, respectively.

2. The deep hole tapered thread tooth tip diameter measuring device according to claim 1, characterized in that, The connecting rod is detachably connected to the dial indicator.

3. A method for measuring the tip diameter of a deep-hole tapered thread, characterized in that, The deep hole tapered thread tooth tip diameter measuring device according to any one of claims 1 or 2 is used to measure the deep hole tapered thread tooth tip diameter; The method includes the following steps: (1) First, insert the sleeve into the deep hole tapered thread workpiece so that the outer edge of the sleeve is completely matched with the upper edge of the deep hole tapered thread workpiece; (2) Place the diameter gauge into the deep hole tapered thread workpiece, so that the wedges at both ends of the diameter gauge are in contact with the bottom end face of the sleeve and the thread tooth tip of the deep hole tapered thread workpiece, respectively. (3) Measure the thread tooth tip diameter using a diameter gauge; (4) Calculate the thread pitch diameter.

4. The method for measuring the tooth tip diameter of a deep-hole tapered thread according to claim 3, characterized in that, The operation of step (4) includes obtaining the thread pitch diameter value E using the following formula. L : E L =D L +2H Among them, E L D is the thread pitch diameter. L H is the thread tooth tip diameter, and H is the distance from the thread tooth tip to the thread centerline.

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