In-process measurement device and method for small-diameter deep-hole bottom skew in a machining state

Abstract

The application discloses a kind of in-process measurement device and method of small-diameter deep hole bottom skew in machining state, including core rod and lever dial gauge;Lever dial gauge is installed in the chuck position of tool holder on machine tool spindle;Core rod is used to insert deep hole on part, and the measuring point of core rod is contacted with the head of lever dial gauge;The depth L1 of deep hole on part is equal to the distance L2 from the measuring point of lever dial gauge to the surface of deep hole;Rotate machine tool spindle, observe the change value of lever dial gauge, determine skew amount and skew direction by the change value of lever dial gauge.When in the process of machining deep hole, the skew of hole can be measured by the application when machining to any depth of hole, not only can the skew of hole be found in time, but also the accurate value of skew size and the direction of skew can be measured, and timely corrective measures are taken to prevent workpiece rejection, strengthen control process, and effectively avoid loss due to deep hole machining not reaching the expected result.

Description

Technical Field

[0001] This invention belongs to the field of machining technology, specifically to an in-machine measurement device and method for measuring the bottom tilt of a small-diameter deep hole during machining. Background Technology

[0002] In engineering design, numerous small-diameter, relatively deep through-hole oil passages require drilling. Poor control during machining often leads to deep hole misalignment, which is difficult to measure and ultimately results in misaligned oil passages and scrapped parts. Therefore, it is crucial to monitor and control the degree of misalignment during machining to take timely corrective measures.

[0003] The prior art provides a device for detecting the size of deep holes in deep hole machining, patent application number CN213067400U. This technical solution involves pressing a detection rod with a diameter smaller than the minimum diameter of the deep hole onto an imprint seat and a dye box containing color dye on the machining surface. The detection rod is movably connected to the imprint seat, which can slide on the detection rod. The dye box is located at the bottom of the imprint seat. By controlling the size of the bottom of the detection rod to the imprint seat, the hole size detection requirements at various depths can be achieved. However, this solution is not suitable for in-machine measurement and can only detect the depth of oil holes, but cannot measure data such as skewness.

[0004] In actual processing, existing technology has resulted in significant misalignment of the vertical oil holes in some parts. By the time this is discovered, it is too late, and in severe cases, it can lead to the scrapping of the workpiece. Summary of the Invention

[0005] To address the problems existing in the prior art, the present invention provides an in-machine measurement device and method for measuring the bottom skew of small-diameter deep holes during processing. By applying the device of the present invention, the degree of skew of the deep hole can be understood and controlled at any time during the processing to determine whether it is within the expected range, and corrective measures can be taken in a timely manner when it deviates.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An in-machine measurement method for bottom tilting of small-diameter deep holes during machining includes the following steps:

[0008] Step 1, making the mandrel;

[0009] Step 2: After machining the deep holes on the part, the machine keeps the hole position unchanged and retracts the tool vertically.

[0010] Step 3: Insert the mandrel into the deep hole to the bottom;

[0011] Step 4: Remove the drill bit from the machine tool spindle and install the lever dial indicator into the chuck position of the tool holder.

[0012] Step 5: Determine the dial indicator measurement point of the mandrel so that the depth L1 of the deep hole is equal to the distance L2 from the measurement point of the lever dial indicator to the surface of the deep hole.

[0013] Step 6: Adjust the vertical position of the machine tool spindle and adjust the lever dial indicator so that the indicator head contacts the measuring point of the mandrel;

[0014] Step 7: Rotate the machine tool spindle and observe the change value of the lever dial indicator. Determine the amount and direction of the skew by observing the change value of the lever dial indicator.

[0015] Step 8: Remove the lever dial indicator, pull out the mandrel, and complete the in-machine measurement of the bottom tilt of the small-diameter deep hole under machining conditions.

[0016] Preferably, in step 1, the length of the mandrel is greater than twice the hole depth.

[0017] Preferably, in step 1, the straightness of the mandrel is within 0.03 mm.

[0018] Preferably, in step 1, the diameter of the mandrel is 0.01-0.03 mm smaller than the diameter of the deep hole.

[0019] Preferably, in step 7, half of the change in the lever dial gauge value is the amount of tilt at the center of the hole bottom.

[0020] Preferably, in step 7, the skew direction is determined by the amplitude of the change of the lever dial gauge, and the maximum and minimum directions are the skew directions.

[0021] An in-machine measuring device for a small-diameter deep hole with a skewed bottom during processing includes a mandrel and a lever dial indicator;

[0022] The lever dial indicator is installed at the chuck position of the tool holder on the machine tool spindle;

[0023] The mandrel is used to insert into a deep hole on the part, and the head of the lever dial indicator is in contact with the measuring point of the mandrel; the depth L1 of the deep hole on the part is equal to the distance L2 from the measuring point of the lever dial indicator to the surface of the deep hole; rotate the machine tool spindle and observe the change value of the lever dial indicator, and determine the skew amount and skew direction through the change value of the lever dial indicator.

[0024] Preferably, the length of the mandrel is greater than twice the depth of the hole.

[0025] Preferably, the straightness of the mandrel is within 0.03 mm.

[0026] Preferably, the diameter of the mandrel is 0.01-0.03 mm smaller than the diameter of the deep hole.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects:

[0028] This invention provides an in-machine measurement device for detecting bottom skew in small-diameter deep holes during machining. During deep hole machining, this device can measure the skew at any depth, enabling timely detection of skew, accurate measurement of its magnitude and direction, and prompt corrective action to prevent workpiece scrap. This invention is used for in-machine measurement during the machining of small-diameter deep holes. By applying this method during machining, the degree of skew can be understood and monitored to ensure it is within the expected range, allowing for timely corrective action if deviations occur. This invention enables in-machine measurement of skew generated during deep hole machining at any depth, strengthening process control, ensuring machining quality, and effectively preventing losses due to unsatisfactory results in deep hole machining. Attached Figure Description

[0029] Figure 1 A diagram showing the bottom tilt of a small-diameter deep hole measured in-machine operation;

[0030] In the attached diagram: 1 is the machine tool spindle; 2 is the tool holder; 3 is the lever dial indicator; 4 is the mandrel; 5 is the part. Detailed Implementation

[0031] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0032] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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.

[0033] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0034] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0037] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0038] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0039] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0040] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0041] The purpose of this invention is to provide a method for in-machine measurement of the bottom deviation of small-diameter deep holes during machining. By applying this method, the degree of deviation of the deep hole can be monitored and controlled at any time during the machining process to ensure it is within the expected range. If deviation occurs, corrective measures can be taken promptly. This method achieves its purpose through the following steps:

[0042] This invention discloses an in-machine measurement method for bottom skew of small-diameter deep holes during processing, comprising the following steps:

[0043] Step 1, make mandrel 4: The length of mandrel 4 shall not be less than twice the hole depth, the straightness shall be controlled within 0.03mm, and the diameter of mandrel 4 shall be 0.01-0.03mm smaller than the actual hole diameter.

[0044] Step 2: After machining the deep hole, keep the hole position unchanged and retract the tool vertically.

[0045] Step 3: Insert the mandrel 4 into the deep hole to the bottom;

[0046] Step 4: Remove the drill bit and install the lever dial indicator 3 into the tool holder chuck;

[0047] Step 5, determine the dial indicator measurement point of mandrel 4, so that L1 = L2 (see...) Figure 1 );

[0048] Step 6: Adjust the spindle's vertical position and adjust the dial indicator so that the indicator head contacts the measuring point on mandrel 4;

[0049] Step 7: Rotate the spindle and observe the change in the dial indicator. Half of the change is the deviation of the hole bottom center. The orientation can be determined by the range of change of the dial indicator. The maximum and minimum orientations are the deviation orientations.

[0050] Step 8: Remove the lever dial indicator 3 and pull out the mandrel 4;

[0051] If measurement is required during processing, repeat steps 2) to 8).

[0052] The advantages of this method are: when machining deep holes, this method can be used to measure the hole's skewness at any depth. It can not only detect the hole's skewness in time, but also measure the accurate value of the skewness and the direction of the skewness, so as to take corrective measures in time and prevent the workpiece from being scrapped.

[0053] Example

[0054] This invention discloses an in-machine measurement method for bottom skew of small-diameter deep holes during processing, comprising the following steps:

[0055] Step 1, make mandrel 4: The length of mandrel 4 shall not be less than twice the hole depth, the straightness shall be controlled within 0.03mm, and the diameter of mandrel 4 shall be 0.01-0.03mm smaller than the actual hole diameter.

[0056] Step 2: After machining the deep hole, keep the hole position unchanged and retract the tool vertically.

[0057] Step 3: Insert the mandrel 4 into the deep hole to the bottom;

[0058] Step 4: Remove the drill bit and install the lever dial indicator 3 into the tool holder chuck;

[0059] Step 5, determine the dial indicator measurement point of mandrel 4, so that L1 = L2 (see...) Figure 1 );

[0060] Step 6: Adjust the spindle's vertical position and adjust the dial indicator so that the indicator head contacts the measuring point on mandrel 4;

[0061] Step 7: Rotate the spindle and observe the change in the dial indicator. Half of the change is the deviation of the hole bottom center. The orientation can be determined by the range of change of the dial indicator. The maximum and minimum orientations are the deviation orientations.

[0062] Step 8: Remove the lever dial indicator 3 and pull out the mandrel 4;

[0063] If measurement is required during processing, repeat steps 2 through 8.

[0064] Example 2

[0065] Taking the oil passage hole in the engine gearbox housing as an example: First, a vertical oil passage hole with a depth of 65mm is machined, with the bottom of the hole skewed by no more than 1mm. Finally, an angled oil passage hole is machined to achieve the connection between the two holes. When machining the 65mm deep vertical oil passage hole, a center hole is drilled first, followed by a deep hole. The position of the hole opening is checked using a coordinate measuring machine. The position of the hole bottom is difficult to detect, so the position of the hole opening is used as the reference. After the subsequent angled oil passage hole is completed and the two holes are connected, it is possible to visually see whether the vertical oil passage hole is skewed at the connection point. In actual machining, some parts have vertical oil holes with significant skew. By the time this is discovered after the hole is connected, it is too late, and in severe cases, it can lead to the scrapping of the workpiece. The current method for measuring the bottom tilt of small-diameter deep holes during machining is as follows: 1. Prepare mandrel 4: The length of mandrel 4 should not be less than twice the hole depth, and the straightness should be controlled within 0.03mm. The diameter of mandrel 4 should be 0.01-0.03mm smaller than the actual hole diameter; 2. Drill the center hole using a short drill bit to drill 1 / 3 of the hole depth; 3. Keep the hole position unchanged and retract the drill bit vertically; 4. Insert mandrel 4 into the deep hole to the bottom; 5. Determine the dial indicator measurement point of mandrel 4, ensuring that the distance from the measurement point to the hole opening is equal to the distance from the hole opening to the bottom; 6. Adjust the spindle's vertical position and adjust the dial indicator so that the indicator head contacts the measurement point of mandrel 4; 7. Rotate the spindle and observe the change in the dial indicator value. Half of the change value is the tilt amount at the bottom center of the hole. The orientation can be determined by the amplitude of the dial indicator change, with the maximum and minimum orientations being the tilt orientations; 8. Remove lever dial indicator 3 and pull out mandrel 4.

[0066] If measurement is required at any depth of the hole during processing, repeat steps 3 to 8.

[0067] This method allows for on-machine measurement of skew caused by deep hole machining at any depth, enhancing process control, ensuring machining quality, and effectively preventing losses due to the final result of deep hole machining failing to meet expectations.

[0068] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0069] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of the present invention and should not be construed as limiting the scope of protection of the present invention. Any modifications made based on the technical concept proposed in this invention shall fall within the scope of protection of the claims of this invention.

Claims

1. An in-machine measurement method for bottom skew of small-diameter deep holes during machining, characterized in that, Includes the following steps, Step 1, make the mandrel (4); Step 2: After machining the deep hole on part (5), the equipment keeps the hole position unchanged and retracts the tool vertically. Step 3: Insert the mandrel (4) into the deep hole to the bottom; Step 4: Remove the drill bit from the machine tool spindle (1) and install the lever dial indicator (3) into the chuck position of the tool holder (2); Step 5: Determine the dial indicator measurement point of the mandrel (4) so ​​that the depth L1 of the deep hole is equal to the distance L2 from the measurement point of the lever dial indicator (3) to the surface of the deep hole. Step 6: Adjust the vertical position of the machine tool spindle (1) and adjust the lever dial indicator (3) so that the indicator head contacts the measuring point of the mandrel (4); Step 7: Rotate the machine tool spindle (1) and observe the change value of the lever dial indicator (3). Determine the amount and direction of the skew by observing the change value of the lever dial indicator (3). Step 8: Remove the lever dial indicator (3), pull out the mandrel (4), and complete the in-machine measurement of the bottom tilt of the small diameter deep hole under the processing state; In step 7, half of the change in the lever dial indicator (3) is the amount of tilt at the center of the hole bottom; In step 7, the skew direction is determined by the range of change of the lever dial indicator (3), and the maximum and minimum directions are the skew directions.

2. The in-machine measurement method for bottom tilting of a small-diameter deep hole under machining conditions according to claim 1, characterized in that, In step 1, the length of the mandrel (4) is greater than twice the hole depth.

3. The in-machine measurement method for bottom tilting of a small-diameter deep hole under machining conditions according to claim 1, characterized in that, In step 1, the straightness of the mandrel (4) is within 0.03 mm.

4. The in-machine measurement method for bottom tilting of a small-diameter deep hole under machining conditions according to claim 1, characterized in that, In step 1, the diameter of the mandrel (4) is 0.01-0.03 mm smaller than the diameter of the deep hole.

5. An in-machine measuring device for measuring the bottom tilt of a small-diameter deep hole in a machining state, implementing the method of claim 1, characterized in that, Includes a mandrel (4) and a lever dial indicator (3); The lever dial indicator (3) is installed on the chuck position of the tool holder (2) on the machine tool spindle (1); The mandrel (4) is used to insert into the deep hole on the part (5), and the head of the lever dial indicator (3) is in contact with the measuring point of the mandrel (4); the depth L1 of the deep hole on the part (5) is equal to the distance L2 from the measuring point of the lever dial indicator (3) to the surface of the deep hole; rotate the machine tool spindle (1), observe the change value of the lever dial indicator (3), and determine the skew amount and skew orientation through the change value of the lever dial indicator (3).

6. The in-machine measuring device for a small-diameter deep hole with a skewed bottom during processing, as described in claim 5, is characterized in that... The length of the mandrel (4) is greater than twice the depth of the hole.

7. The in-machine measuring device for a small-diameter deep hole with a skewed bottom during processing, as described in claim 5, is characterized in that... The straightness of the mandrel (4) is within 0.03 mm.

8. The in-machine measuring device for a small-diameter deep hole with a skewed bottom during processing, as described in claim 5, is characterized in that... The diameter of the mandrel (4) is 0.01-0.03 mm smaller than the diameter of the deep hole.

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