A drawing device and method for measuring the diameter of a large-aperture diamond wire drawing die

Abstract

The present invention discloses a drawing device for measuring the diameter of a large-aperture diamond wire drawing die. With the help of a hollow hydraulic cylinder structure, a quick positioning mechanism, a connector and a positioning plate of the mold to be tested, a drawing test is performed on the large-aperture diamond wire drawing die. By manually applying continuous pressure, the piston movement of the hollow hydraulic cylinder drives the threaded pull rod to move to the side away from the positioning plate of the mold to be tested, so that the test rod passes through the aperture of the mold to be tested, and the pressure value display shows the corresponding pressure value. The above-mentioned drawing device for measuring the diameter of a large-aperture diamond wire drawing die can realize convenient and quick clamping of workpieces, firmly and reliably pull samples, and ensure the drawing capacity required when measuring the aperture of a large-aperture diamond wire drawing die; it can be used for drawing tests on large-aperture and super-large-aperture diamond wire drawing dies with a diameter of more than 7 mm, and there will be no "unable to get stuck" or "unable to pull" phenomena. The present invention also provides a method for measuring the diameter of a large-aperture diamond wire drawing die.

Description

Technical Field

[0001] The invention relates to a drawing device suitable for measuring the diameter of a large-aperture diamond wire drawing die, and also relates to a method for measuring the diameter of a large-aperture diamond wire drawing die, belonging to the technical field of wire drawing die manufacturing. Background Art

[0002] At present, the wire drawing die manufacturing industry mainly uses the indirect reading method of wire drawing diameter measurement for the hole diameter measurement of diamond wire drawing dies. The reason is that the manufacturers who use wire drawing dies all use the measured wire diameter value of the product as the final size requirement, which is also the only standard for measuring the hole diameter accuracy of wire drawing dies. Therefore, determining the hole diameter size accuracy of wire drawing dies by measuring the wire diameter is a method and unified standard jointly adopted by wire drawing die manufacturers and application manufacturers.

[0003] For dies with tiny apertures, it is common to measure by hand drawing, which is simple and easy to operate. However, due to the uneven drawing process, it is easy to cause errors in the accuracy of the measured values. This phenomenon is more prominent when measuring wire drawing dies with apertures above 0.5mm.

[0004] When measuring dies with larger apertures, a special wire drawing device is generally used. There are two types of wire drawing devices currently used to measure the aperture of wire drawing dies: one is a pneumatic drawing device, and the other is a drawing device with a lead screw, nut structure or pulley structure driven by a motor. Its main structure can be found in the wire drawing die diameter measuring wire drawing machine disclosed in the Chinese utility model patent with patent number ZL 93205444.7. The device is composed of a base plate, a baffle, a guide rod, a chuck, a slider, a power shaft and a power system. Its main advantages are safety and reliability, labor saving, firm wire clamping, and free and convenient clamping. The common shortcomings of this drawing device in the prior art are that it cannot adapt to the drawing measurement of diamond wire drawing dies with an aperture greater than 7.0 mm. Its main defects are the following two points: ① It cannot be stuck; the larger the measured aperture, the thicker the wire diameter that needs to be drawn, and the required drawing force also increases by several times; in the existing technology, the technical parameters of the clamping head structure are designed according to the maximum diameter of the wire being stuck is 6.5mm. If it is greater than this value, it will slip and cannot be stuck, resulting in drawing failure; ② It cannot be pulled; when the existing wire drawing die is used to measure the wire drawing machine drawing aperture above 6.5mm, there will be creeping, shaking or even machine shutdown.

[0005] At present, the demand for large-aperture diamond wire drawing dies in the metal products market is gradually increasing. With the substantial improvement of large-size polycrystalline diamond blank manufacturing technology, the manufacturing aperture of wire drawing dies has increased by more than 5 times from the traditional maximum aperture of less than 7mm to nearly 40mm. The original wire drawing die diameter measurement technology cannot meet the demand for such large-aperture diamond wire drawing dies. Summary of the invention

[0006] The primary technical problem to be solved by the present invention is to provide a drawing device for measuring the diameter of a large-aperture diamond drawing die.

[0007] Another technical problem to be solved by the present invention is to provide a method for measuring the diameter of a large-aperture diamond wire drawing die, which is implemented based on the above-mentioned drawing device for measuring the diameter of a large-aperture diamond wire drawing die.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A drawing device for measuring the diameter of a large-aperture diamond wire drawing die, comprising a manual pump equipped with a pressurizing handle, a relief valve and a pressure sensor, a hollow hydraulic cylinder connected to the manual pump by a high-pressure oil pipe, and a pressure value display connected to the pressure sensor; also comprising a pull rod quick positioning mechanism, a connector and a positioning plate for the die to be inspected;

[0010] The pull rod quick positioning mechanism is composed of a threaded pull rod, an annular groove positioning block and a U-shaped chuck. The threaded pull rod passes through the hollow hydraulic cylinder. The side of the threaded pull rod close to the top of the hollow hydraulic cylinder is provided with the position-adjustable annular groove positioning block and the U-shaped chuck.

[0011] The connector is located between the threaded rod and the measuring rod, one end of the connector is used to be fixed to the bottom end of the threaded rod, and the other end is used to connect to the measuring rod;

[0012] The mold positioning plate to be inspected is located at one side of the bottom of the hollow hydraulic cylinder and is fixed in the inner hole of the hollow hydraulic cylinder. The mold positioning plate to be inspected is used to fix the mold to be inspected;

[0013] The piston movement of the hollow hydraulic cylinder drives the threaded pull rod to move toward a side away from the positioning plate of the mold to be inspected, so that the test rod passes through the aperture of the mold to be inspected, and the pressure value display displays the corresponding pressure value.

[0014] Preferably, the length of the threaded rod is 1.2 to 1.4 times the diameter of the hollow hydraulic cylinder, one end of the threaded rod for connecting to the connector is an internal threaded hole, and the other end is an external threaded screw, and the length of the external thread accounts for more than 40% of the total length of the threaded rod.

[0015] Preferably, the inner thread of the annular groove positioning block matches the outer thread of the threaded pull rod, the outer diameter is smaller than the inner diameter of the piston end cover of the hollow hydraulic cylinder, and an annular groove is provided in the middle of the annular groove positioning block.

[0016] Preferably, the thickness of the U-shaped chuck matches the width of the annular groove of the annular groove positioning block, and the width of the U-shaped groove matches the diameter of the annular groove.

[0017] Preferably, the connector is in the shape of a double-ended external thread with an external hexagon in the middle, wherein one end of the external thread matches the internal thread hole of the threaded pull rod, and the other end of the external thread is used to fix the measuring rod.

[0018] Preferably, one end of the measuring rod is chamfered at an angle equal to the inner angle of the compression zone of the mold to be inspected, and a threaded inner hole for connecting the connector is provided in the middle of the end surface.

[0019] Preferably, the mold positioning plate to be inspected has a mold positioning surface in a stepped shape consisting of multiple layers of positioning ring grooves.

[0020] Preferably, it also includes a stop gauge and a go gauge for estimating the aperture size of the mold to be inspected, the stop gauge and the go gauge respectively consisting of a hand-held part and a detection part, and the diameter of the detection part of the go gauge is smaller than the diameter of the detection part of the stop gauge.

[0021] A method for measuring the diameter of a large-aperture diamond wire drawing die is implemented based on the above-mentioned drawing device for measuring the diameter of a large-aperture diamond wire drawing die, and comprises the following steps:

[0022] (1) Use the chamfered end of the measuring rod to press against the inner corner of the compression zone of the mold to be inspected, use the connector together with the threaded pull rod to penetrate from the other side of the mold to be inspected, and connect and fix the measuring rod;

[0023] (2) The threaded pull rod connected to the measuring rod is passed through the side of the hollow hydraulic cylinder equipped with the positioning plate of the mold to be inspected, and the mold to be inspected is held in the hand and pushed into the corresponding positioning ring groove of the positioning plate of the mold to be inspected, flattened and fixed;

[0024] (3) rotating the annular groove positioning block to adjust its position on the threaded pull rod, adjusting the edge of the annular groove on the annular groove positioning block to a position parallel to the piston end cover, and inserting the U-shaped chuck into the annular groove;

[0025] (4) Tighten the unloading valve clockwise, operate the pressure handle of the manual pump, pull the measuring rod through the mold to be inspected through the hollow hydraulic cylinder, perform measurement, and observe the pressure value display at the same time to record the displayed pressure value;

[0026] Loosen the unloading valve counterclockwise, and the piston on the hollow hydraulic cylinder automatically returns to its original position, completing a single diameter measurement.

[0027] (5) According to the pressure value range required by the mold to be inspected, the value recorded on the display is compared. If the recorded value exceeds the range, the hole shape of the mold to be inspected is trimmed to improve the smoothness of the hole shape;

[0028] (6) Compare the measurement result with the required size of the finished product of the mold to be inspected. If the required size is not reached, continue the de-measuring process and measure according to steps (1), (2), (3), (4), and (5), and repeat the process until the measurement result meets the requirements, thus completing the entire operation process.

[0029] Preferably, before step (1), the method further includes the step of estimating the mold to be inspected using a probe gauge, and when the over gauge has not passed through the sizing zone of the mold to be inspected, the mold to be inspected continues to be desized; when the over gauge passes through the mold to be inspected and the stop gauge is blocked and cannot pass through, the abrasive with a finer particle size is replaced for desizing; when the stop gauge passes through the mold to be inspected, measurement can be performed on the drawing device for measuring the diameter of large-aperture diamond drawing dies.

[0030] The drawing device for measuring the diameter of a large-aperture diamond wire drawing die provided by the present invention can perform a drawing test on a large-aperture diamond wire drawing die by means of a hollow hydraulic cylinder structure, a quick positioning mechanism, a connector, a positioning plate of the mold to be inspected and other structures, so as to realize convenient and quick clamping of the workpiece, firmly and reliably pull the sample, and ensure the drawing capacity required by the drawing device when measuring the aperture of the large-aperture diamond wire drawing die. The above-mentioned drawing device for measuring the diameter of a large-aperture diamond wire drawing die can be used for drawing tests on large-aperture and ultra-large-aperture diamond wire drawing dies with a diameter of more than 7 mm, and there will be no phenomena such as "not being stuck" or "not being able to be pulled" during the drawing test. By using the above-mentioned drawing device for measuring the diameter of a large-aperture diamond wire drawing die in combination with a plurality of measuring rods with different outer diameters, the aperture size of the large-aperture diamond wire drawing die can be repeatedly measured and precisely processed, thereby obtaining a large-aperture diamond wire drawing die whose measurement results meet the requirements of the finished product. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic diagram of the overall appearance of a drawing device for measuring the diameter of a large-aperture diamond wire drawing die provided by the present invention;

[0032] Figure 2 This is a schematic diagram of the main structure of a drawing device for measuring the diameter of a large-aperture diamond wire drawing die provided by the present invention;

[0033] Figure 3 for Figure 2 A schematic diagram of the assembly relationship between the annular slot positioning block and the U-shaped chuck in the main structure of the pulling device shown;

[0034] Figure 4 A schematic diagram of the assembly relationship between the connector and the threaded pull rod provided by the present invention;

[0035] Figure 5 A schematic diagram of the assembly relationship between the measuring rod and the connector provided by the present invention;

[0036] Figure 6 This is a schematic diagram of the structure of the positioning plate of the mold to be inspected provided by the present invention;

[0037] Figure 7 This is a schematic diagram of the structure of the probe gauge provided by the present invention for estimating the size of the mold to be inspected. DETAILED DESCRIPTION

[0038] The technical contents provided by the present invention are further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0039] In order to effectively solve the shortcomings of the prior art, such as "cannot get stuck" and "cannot be pulled" during drawing tests of large-aperture diamond wire drawing dies of more than 7 mm, the present invention provides a drawing device suitable for measuring the diameter of large-aperture and ultra-large-aperture diamond wire drawing dies. The large-aperture diamond wire drawing dies are subjected to drawing tests by means of hollow hydraulic cylinder structures, rapid positioning mechanisms, connectors, and inspection mold positioning plates. The workpieces can be clamped conveniently and quickly, and the samples can be drawn firmly and reliably, and the drawing capacity required for measuring the aperture of large-aperture diamond wire drawing dies can be ensured.

[0040] like Figure 1 As shown, the drawing device for measuring the diameter of a large-aperture diamond wire drawing die provided by the present invention (hereinafter referred to as the drawing device) comprises three parts: a manual pump 11 as an operating link, a hollow hydraulic cylinder 1 as a moving link and its accessories, and a pressure value display 15 as a display link. Among them, the manual pump 11 is equipped with a pressurizing handle 12, a unloading valve 14 and a pressure sensor 13; the manual pump 11 and the hollow hydraulic cylinder 1 are connected by a high-pressure oil pipe; the pressure value display 15 is connected to the pressure sensor 13 through a data line.

[0041] like Figure 2 As shown, a pull rod quick positioning mechanism, a connector 7 and a positioning plate 8 for the mold to be inspected are respectively provided at both ends of the hollow hydraulic cylinder 1. The pull rod quick positioning mechanism is located on one side of the top of the hollow hydraulic cylinder 1 where the piston can be operated (such as Figure 1 and Figure 2The hollow hydraulic cylinder 1 is shown on the right side, and is composed of a threaded tie rod 6 passing through the hollow hydraulic cylinder 1, an annular groove positioning block 4 and a U-shaped chuck 5 arranged on the threaded tie rod 6, the annular groove positioning block 4 and the U-shaped chuck 5 are arranged on the threaded tie rod 6 on one side close to the top of the hollow hydraulic cylinder 1, and the setting positions of the annular groove positioning block 4 and the U-shaped chuck 5 are adjustable; the connector 7 is located between the threaded tie rod 6 and the measuring rod 10, and is used to realize the connection between the threaded tie rod 6 and the measuring rod 10; one end of the connector 7 is fixed to the bottom end of the threaded tie rod 6, and the other end is used to connect the measuring rod 10; the positioning plate 8 of the mold to be inspected is located on one side of the bottom of the hollow hydraulic cylinder 1, and is fixed in the inner hole of the hollow hydraulic cylinder 1.

[0042] Specifically, the piston end cover 3 and the mold positioning plate 8 to be inspected are symmetrically mounted on the top of the moving piston 2 and the bottom of the hollow hydraulic cylinder 1, respectively, and the threaded tie rod 6 runs through the hollow hydraulic cylinder 1. The length of the threaded tie rod 6 is 1.2 to 1.4 times the diameter of the hollow hydraulic cylinder 1. The end of the threaded tie rod 6 with internal threads is fixed to the measuring rod 10 through the connector 7. The end of the threaded tie rod 6 with external threads is equipped with an adjustable position annular groove positioning block 4 and a U-shaped chuck 5. The length of the external threads accounts for more than 40% of the total length of the threaded tie rod 6. The mold to be inspected 9 and the U-shaped chuck 5 respectively resist the mold positioning plate 8 to be inspected and the piston end cover 3, and are pulled against each other under the action of the movement of the piston 2.

[0043] Depend on Figure 2 and Figure 3 It can be seen that the annular groove positioning block 4 can be flexibly moved and adjusted on the threaded pull rod 6 by rotating. The inner hole thread of the annular groove positioning block 4 matches the outer thread of the threaded pull rod 6, and the outer diameter is slightly smaller than the inner hole diameter of the piston end cover 3 of the hollow hydraulic cylinder 1. The annular groove is located in the middle part of the annular groove positioning block 4. The U-shaped chuck 5 can be freely inserted into or removed from the annular groove of the annular groove positioning block 4. The thickness of the U-shaped chuck 5 matches the width of the annular groove of the annular groove positioning block 4, the width of the U-shaped groove of the U-shaped chuck 5 matches the diameter of the annular groove part of the annular groove positioning block 4, and the outer diameter of the U-shaped chuck 5 is similar to the shape of the piston end cover 3 of the hollow hydraulic cylinder 1. The drawing device can use this structure to conveniently and quickly adjust the relative position of the drawing, and reliably ensure the smooth operation of the drawing process. It can not only save auxiliary man-hours to a large extent, but also make the structure more concise and easy to operate.

[0044] Combination Figure 2 , Figure 4 , Figure 5 It can be seen that the connector 7 is in the shape of a double-ended external thread with a middle external hexagon, wherein one end of the external thread matches the internal thread hole of the threaded pull rod 6 (such as Figure 4 The other end of the external thread is used to fix the measuring rod 10 (as shown in Figure 5One end of the measuring rod 10 is chamfered, and its angle is equal to the inner angle of the compression zone of the mold 9 to be inspected. A threaded inner hole for threaded connection with the connector 7 is provided in the middle of the end surface of the measuring rod 10.

[0045] The appearance structure of the connector 7 and the connection relationship between the pull rod 6 and the test rod 10 are respectively shown in Figure 4 and Figure 5 . In order to accurately measure the aperture of the same drawing die, it is necessary to use multiple measuring rods 10 with different outer diameters for diameter measurement, and the outer diameter size of the multiple measuring rods 10 is determined according to the aperture of the die to be tested. In order to achieve the connection between the threaded pull rod 6 and the multiple measuring rods 10, the connector 7 needs to be replaced at the same time. Among them, the screw buckle size of one end of the multiple connectors 7 connected to the threaded pull rod 6 is single and fixed, while the screw buckle size of one end used to connect the test rod 10 needs to be determined according to the aperture of the die to be tested and the size of the pulling force. Therefore, the drawing device provided by the present invention also needs to provide multiple connector 7 accessories of different sizes to match it, so as to be suitable for drawing tests of large-aperture diamond drawing dies of various specifications.

[0046] Combination Figure 2 , Figure 6 It can be seen that the mold positioning plate 8 to be inspected, located at the bottom of the hydraulic cylinder, has one end fixed in the inner hole of the hollow hydraulic cylinder 1, and the other end surface is a mold positioning surface in a stepped shape composed of multiple layers of positioning ring grooves, each layer of positioning ring grooves corresponding to a mold to be inspected of a certain size, which is used for mold positioning. In actual application, the mold to be inspected 9 is embedded in the corresponding positioning ring groove and is firmly attached to the plane, so that the mold to be inspected 9 can be fixed, and the test rod 10 can be ensured to run evenly and smoothly along the central axis of the mold to be inspected 9.

[0047] The structure of the drawing device provided by the present invention is introduced above. When the drawing device is used to perform a drawing test on the mold to be tested, the piston movement of the hollow hydraulic cylinder 1 drives the threaded pull rod 6 to move to the side away from the positioning plate 8 of the mold to be tested by manual continuous pressure application, so that the test rod 10 passes through the aperture of the mold to be tested 9, and the pressure value display 15 displays the corresponding pressure value. By comparing the measured pressure value with the required pressure value range of the mold to be tested, it is judged whether the aperture of the mold to be tested meets the product requirements. When the measured pressure value exceeds the required pressure value range of the mold to be tested, the aperture of the mold to be tested 9 is small, and it needs to be processed until the measured pressure value falls into the required pressure value range of the mold to be tested. The above device uses a manual pump for pressurization, which can flexibly adjust the loaded pressure value, and the pressure value measurement result is more accurate. At the same time, the above device uses a threaded pull rod and a connector to connect with the measuring rod. Compared with the existing drawing device that uses a clamp to bite the measuring wire, the threaded pull rod and the connector can be firmly connected to the measuring rod with a larger diameter, and can provide a larger pulling force. Therefore, the above-mentioned drawing device is suitable for measuring the diameter of diamond wire drawing dies with large aperture and ultra-large aperture.

[0048] Figure 7 The probe gauge 16 shown is an important tool for implementing the large-aperture diamond wire drawing die diameter measurement method provided by the present invention. The probe gauge 16 is used to estimate the size of the mold to be inspected and is used to assist in diameter measurement. The probe gauge 16 is divided into two types: a stop gauge and an over gauge. The appearance, shape and structure of the two are all the same, and both are composed of a hand-held part 16A and a detection part 16B. The only difference between the two is that there is a difference in the diameter size of the detection part 16B. Generally, the diameter size of the over gauge detection part is 0.05 to 0.07 mm smaller than the diameter size of the stop gauge detection part, or it can be modified according to actual needs. The diameter size of the stop gauge detection part is smaller than the finished size of the mold to be inspected. The specific size of the diameter of the over gauge and stop gauge detection parts needs to be determined according to the finished size of the mold to be inspected and actual needs.

[0049] The present invention also provides an application method of a drawing device for measuring the diameter of a large-aperture diamond wire drawing die, and the specific implementation process includes the following steps.

[0050] ① Preparation: According to the finished product size of the mold to be inspected, make the stop gauge, over gauge and measuring rod 10 respectively. Among them, the size of the stop gauge detection part is 0.10-0.12mm smaller than the finished product size, and the size of the over gauge detection part is 0.05-0.07mm smaller than the size of the stop gauge detection part. The diameter of the measuring rod 10 is 0.12-0.15mm larger than the finished product size. The number is 2-3. If it cannot meet the actual needs, it can be supplemented during the measurement process.

[0051] ②Estimation process: Use the pass gauge to push vertically along the center axis from the entrance of the mold to be inspected, with balanced force. If it cannot be pushed through due to resistance, it is necessary to continue to perform de-gauging on the mold to be inspected. Repeat the procedure of "processing-estimation-processing-estimation" until the pass gauge passes through the mold to be inspected, and then use the stop gauge to detect. If the stop gauge is blocked and cannot pass through, it is necessary to replace the abrasive with a finer particle size for de-gauging; then repeat the procedure of "processing-estimation-processing-estimation" until the stop gauge passes through the mold to be inspected. When the stop gauge passes through the mold to be inspected, the next step of measurement can be performed on the drawing device.

[0052] ③ Measurement process: Based on the estimation of the aperture of the mold to be inspected, use the measuring rod and the pulling device prepared above to perform the pulling test through the following steps, record the data and compare it with the nominal size of the finished mold to determine the direction of processing. Processing - measurement... repeat until the standard size is reached and the processing is completed. Specifically, it includes the following operations that are performed cyclically:

[0053] (31) Use the chamfered end of the measuring rod to press against the inner corner of the compression zone of the mold to be inspected, and use a connector together with a threaded pull rod to penetrate from the other side of the mold to be inspected to connect and fix the measuring rod;

[0054] (32) Pass the threaded pull rod connected to the measuring rod through the side of the hollow hydraulic cylinder equipped with the positioning plate of the mold to be inspected, hold the mold to be inspected and push it into the corresponding positioning ring groove of the positioning plate of the mold to be inspected, flatten it and fix it;

[0055] (33) Rotate the annular groove positioning block to adjust the position of the annular groove positioning block on the threaded pull rod, adjust the edge of the annular groove on the annular groove positioning block to a position parallel to the piston end cover, and insert the U-shaped chuck into the annular groove;

[0056] (34) Tighten the unloading valve clockwise, operate the pressure handle of the manual pump, pull the measuring rod out of the mold to be inspected through the hollow hydraulic cylinder, measure, and observe the pressure value display at the same time, and record the displayed pressure value;

[0057] Loosen the unloading valve counterclockwise, and the piston on the hollow hydraulic cylinder will automatically return to its position, completing a single diameter measurement.

[0058] (35) According to the required pressure range of the mold to be inspected, compare the value recorded on the display. If the recorded value exceeds the range, the hole shape of the mold to be inspected needs to be trimmed to improve the smoothness of the hole shape;

[0059] (36) The measurement result is compared with the required size of the finished product of the mold to be inspected. If it is not met, it is necessary to continue the de-measuring process and measure it according to steps (31) to (35), and repeat the process until the measurement result meets the requirements and the entire operation process is completed.

[0060] In summary, the drawing device for measuring the diameter of large-aperture diamond wire drawing dies provided by the present invention can perform a drawing test on large-aperture diamond wire drawing dies by means of a hollow hydraulic cylinder structure, a quick positioning mechanism, a connector, a positioning plate of the mold to be inspected and other structures, so as to realize convenient and quick clamping of the workpiece, firmly and reliably pull the sample, and ensure the drawing capacity required by the drawing device for measuring the aperture of large-aperture diamond wire drawing dies. The above-mentioned drawing device for measuring the diameter of large-aperture diamond wire drawing dies can be used for drawing tests on large-aperture and ultra-large-aperture diamond wire drawing dies with a diameter of more than 7 mm, and there will be no phenomena such as "not being able to get stuck" or "not being able to be pulled" during the drawing test. By using the above-mentioned drawing device for measuring the diameter of large-aperture diamond wire drawing dies in combination with a plurality of measuring rods with different outer diameters, the aperture size of the large-aperture diamond wire drawing dies can be repeatedly measured and processed, thereby obtaining a large-aperture diamond wire drawing die whose measurement results meet the requirements of the finished product.

[0061] The above is a detailed description of the drawing device and method for measuring the diameter of a large-aperture diamond wire drawing die provided by the present invention. For those skilled in the art, any obvious changes made to it without departing from the essential spirit of the present invention will constitute an infringement of the patent right of the present invention and will bear corresponding legal responsibilities.

Claims

1. A drawing device for measuring the diameter of a large-aperture diamond wire drawing die, characterized in that It includes a manual pump equipped with a pressurizing handle, a relief valve and a pressure sensor, a hollow hydraulic cylinder connected to the manual pump by a high-pressure oil pipe, and a pressure value display connected to the pressure sensor; it also includes a pull rod quick positioning mechanism, a connector and a positioning plate for the mold to be inspected; The pull rod quick positioning mechanism is composed of a threaded pull rod, an annular groove positioning block and a U-shaped chuck. The threaded pull rod passes through the hollow hydraulic cylinder. The side of the threaded pull rod close to the top of the hollow hydraulic cylinder is provided with the position-adjustable annular groove positioning block and the U-shaped chuck. The connector is located between the threaded rod and the measuring rod, one end of the connector is used to be fixed to the bottom end of the threaded rod, and the other end is used to connect to the measuring rod; The mold positioning plate to be inspected is located at one side of the bottom of the hollow hydraulic cylinder and is fixed in the inner hole of the hollow hydraulic cylinder. The mold positioning plate to be inspected is used to fix the mold to be inspected; The piston movement of the hollow hydraulic cylinder drives the threaded pull rod to move toward a side away from the positioning plate of the mold to be inspected, so that the measuring rod passes through the aperture of the mold to be inspected, and the pressure value display shows the corresponding pressure value; The length of the threaded rod is 1.2 to 1.4 times the diameter of the hollow hydraulic cylinder. One end of the threaded rod used for connecting to the connector is an internal threaded hole, and the other end is an external threaded screw. The length of the external thread accounts for more than 40% of the total length of the threaded rod. The connector is in the shape of a double-ended external thread, wherein one end of the external thread matches the internal thread hole of the threaded pull rod, and the other end of the external thread is used to fix the measuring rod.

2. The drawing device for measuring the diameter of a large-aperture diamond wire drawing die according to claim 1, characterized in that: The inner thread of the annular groove positioning block matches the outer thread of the threaded pull rod, and the outer diameter is smaller than the inner diameter of the piston end cover of the hollow hydraulic cylinder. An annular groove is provided in the middle of the annular groove positioning block.

3. The drawing device for measuring the diameter of a large-aperture diamond wire drawing die according to claim 2, characterized in that: The thickness of the U-shaped chuck matches the width of the annular groove of the annular groove positioning block, and the width of the U-shaped groove of the U-shaped chuck matches the diameter of the annular groove portion of the annular groove positioning block.

4. The drawing device for measuring the diameter of a large-aperture diamond wire drawing die according to claim 1, characterized in that: One end of the measuring rod is chamfered at an angle equal to the inner angle of the compression zone of the mold to be inspected, and a threaded inner hole for connecting the connector is provided in the middle of the end surface of the measuring rod.

5. The drawing device for measuring the diameter of a large-aperture diamond wire drawing die according to claim 1, characterized in that: The mold positioning plate to be inspected has a mold positioning surface in a stepped shape composed of multiple layers of positioning ring grooves, and each layer of positioning ring grooves corresponds to a mold to be inspected with a certain external size.

6. The drawing device for measuring the diameter of a large-aperture diamond wire drawing die according to claim 1, characterized in that: It also includes a stop gauge and a pass gauge for estimating the aperture size of the mold to be inspected, the stop gauge and the pass gauge are respectively composed of a handheld part and a detection part, and the diameter of the detection part of the pass gauge is smaller than the diameter of the detection part of the stop gauge.

7. A method for measuring the diameter of a large-aperture diamond wire drawing die, which is implemented based on the drawing device for measuring the diameter of a large-aperture diamond wire drawing die according to claim 2, characterized in that The following steps are involved: (1) Use the chamfered end of the measuring rod to press against the inner corner of the compression zone of the mold to be inspected, use the connector together with the threaded pull rod to penetrate from the other side of the mold to be inspected, and connect and fix the measuring rod; (2) The threaded pull rod connected to the measuring rod is passed through the side of the hollow hydraulic cylinder equipped with the positioning plate of the mold to be inspected, and the mold to be inspected is held in the hand and pushed into the corresponding positioning ring groove of the positioning plate of the mold to be inspected, flattened and fixed; (3) rotating the annular groove positioning block to adjust its position on the threaded pull rod, adjusting the edge of the annular groove on the annular groove positioning block to a position parallel to the piston end cover, and inserting the U-shaped chuck into the annular groove; (4) Tighten the unloading valve clockwise, operate the pressure handle of the manual pump, pull the measuring rod through the mold to be inspected through the hollow hydraulic cylinder, perform measurement, and observe the pressure value display at the same time to record the displayed pressure value; Loosen the unloading valve counterclockwise, and the piston on the hollow hydraulic cylinder automatically returns to its original position, completing a single diameter measurement. (5) According to the required pressure value range of the mold to be inspected, the value recorded on the display is compared. If the recorded value exceeds the range, the hole shape of the mold to be inspected is trimmed to improve the smoothness of the hole shape; (6) Compare the measurement result with the required size of the finished product of the mold to be inspected. If the required size is not reached, continue the de-measuring process and measure according to steps (1), (2), (3), (4), and (5), and repeat the process until the measurement result meets the requirements, thus completing the entire operation process.

8. The method for measuring the diameter of a large-aperture diamond wire drawing die according to claim 7, characterized in that Before step (1), the method also includes the step of using a probe gauge to estimate the mold to be inspected. When the over gauge has not passed through the sizing area of ​​the mold to be inspected, the mold to be inspected continues to be desized. When the over gauge passes through the mold to be inspected and the stop gauge is blocked and cannot pass through, the abrasive with a finer particle size is replaced for desizing. When the stop gauge passes through the mold to be inspected, step (1) is executed.

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