Mold abnormality detection mechanism and method

Abstract

The present invention discloses a die abnormal detection mechanism and method. The mechanism includes a ejector rod sleeve, a rear through ejector rod, a clamping block assembly, a proximity switch and a limit guiding assembly. The rear through ejector rod passes through the ejector rod sleeve and is slidably matched with the ejector rod sleeve. The clamping block assembly includes at least two clamping blocks and adjusting bolts. The two clamping blocks clamp the rear through ejector rod. The limit guiding assembly includes a guiding rod and a limiting member. The limiting member is installed on the guiding rod. A switch bracket is provided on the ejector rod sleeve. The method includes: a. When the equipment is powered on, input the normal working angle of the crankshaft rotation; b. When the equipment runs, the rear through ejector rod drives the clamping blocks; c. When the clamping blocks move to the end of the stroke, the proximity switch sends out an electrical signal; d. After the equipment system receives the electrical signal, collect the crankshaft rotation angle and compare; e. When the rotation angle is normal, the equipment continues to run, otherwise, the equipment stops abnormally. The die abnormal detection mechanism and method obtained by the present invention can timely detect equipment problems and stop the machine in time, ensuring safe production and avoiding losses.

Description

Technical Field

[0001] The present invention relates to a cold heading device, in particular to a die abnormality detection mechanism and method. Background Art

[0002] A cold heading machine is one of the most common fastener production devices in modern industry. It performs upsetting processing on metal materials by mutual extrusion between a punch and a die to achieve the purpose of low-temperature forming of metal parts. In the actual production process, abnormalities of the die, punch, and metal materials will all affect the correct forming of products. Moreover, due to the high processing efficiency and speed of the cold heading machine, with a large number of parts and small volume, it is difficult to quickly detect problems with the die, which is likely to affect production and cause economic losses. Summary of the Invention

[0003] The purpose of the present invention is to provide an efficient and convenient die abnormality detection mechanism and method to solve the above-mentioned deficiencies of the prior art.

[0004] To achieve the above purpose, the die abnormality detection mechanism designed by the present invention includes a thimble sleeve, a rear through thimble, a clamp block assembly, a proximity switch, and a limit guiding assembly. The rear through thimble passes through the thimble sleeve and is in sliding fit with the thimble sleeve. The clamp block assembly includes at least two clamp blocks and an adjusting bolt connecting the two clamp blocks. The two clamp blocks clamp the rear through thimble. The limit guiding assembly includes a guiding rod and a limiting member. One end of the guiding rod passes through the clamp block and is fixedly connected to the thimble sleeve. The limiting member is installed on the guiding rod to limit the stroke of the clamp block. A switch bracket is provided on the thimble sleeve. The switch bracket is provided with a cantilever that extends towards the limiting member. The proximity switch is arranged at the end of the cantilever, and the probe of the proximity switch is aligned with the end of the clamp block away from the thimble sleeve during the stroke.

[0005] To ensure reliable reset of the clamp block, the limiting member includes a backing plate, a limit sleeve, a guide sleeve, and a limit spring. The backing plate is arranged between the thimble sleeve and the clamp block. A stepped hole is provided in the clamp block. The limit sleeve is in a T shape and includes a sleeve and a limit edge. The sleeve passes through the stepped hole and is fixedly connected to the backing plate. A gap is left between the limit edge facing the thimble sleeve and the step in the stepped hole, and the length of this gap is the same as the stroke of the clamp block. One end of the guide sleeve abuts against the limit sleeve, and the other end is provided with a spring seat. The limit spring is sleeved outside the guide sleeve. One end of the limit spring abuts against the spring seat, and the other end abuts against the clamp block. The frictional force between the clamp block and the rear through thimble is greater than the pressure of the limit spring on the clamp block when the clamp block contacts the spacer block.

[0006] To facilitate disassembly and assembly, the guiding rod is a screw and is fixedly connected to the thimble sleeve by threading.

[0007] To facilitate the adjustment of the friction between the clamping block assembly and the rear through push rod and avoid mutual scratching between the clamping block and the rear through push rod, the clamping block assembly further includes a friction block, a compression spring and an adjusting nut. The friction block is padded between the clamping block and the rear through push rod. The adjusting bolt passes through the clamping block and is connected to the adjusting nut. The compression spring is sleeved on the adjusting bolt, and both ends of the compression spring abut against the adjusting nut and the clamping block respectively.

[0008] The mold abnormality detection method designed by the present invention includes using a cold heading machine equipped with the aforementioned mold abnormality detection mechanism. The cold heading machine further includes an equipment system, a punching tool and a mold, and includes the following steps:

[0009] a. The equipment is powered on, and the normal working angle (A±B)° of the crankshaft rotation is input into the equipment system, where A is the expected accurate angle and B is the allowable error. The accurate angle is the angle that the crankshaft of the cold heading machine rotates from the front dead center of the crankshaft to the moment when the clamping block moves to the end of its stroke and is limited by the limiting member.

[0010] b. The equipment runs. During the running process, the rear through push rod extends into the mold, the punching tool impacts the workpiece installed in the mold, presses against the rear through push rod, and the rear through push rod drives the clamping block to move the clamping block away from the direction of the push rod sleeve to the end of the stroke of the clamping block. At this time, the clamping block is limited by the limiting member.

[0011] c. At the moment when the clamping block moves to the end of its stroke, the proximity switch detects the clamping block and sends an electrical signal to the equipment system.

[0012] d. After the equipment system receives the electrical signal, it collects the current rotation angle of the crankshaft and compares it with the pre-input normal working angle (A±B)°.

[0013] e. When the rotation angle is within the normal working angle range, the equipment continues to run; otherwise, the equipment stops abnormally.

[0014] The mold abnormality detection mechanism and method obtained by the present invention can monitor the situation of the mold in each stamping cycle by setting a proximity switch and a clamping block that moves a short distance, can timely detect equipment problems and stop the machine in time, ensure safe production and avoid losses. Description of the Drawings

[0015] Figure 1 is a schematic diagram of the mold abnormality detection mechanism of Embodiment 1 of the present invention during the cold heading process;

[0016] Figure 2 is Figure 1 an enlarged view of part A in

[0017] Figure 3 is the left view of Embodiment 1;

[0018] Figure 4It is a schematic diagram of Example 1 when the clamping block is at the end of the stroke;

[0019] Figure 5 It is a schematic structural diagram of Embodiment 2 of the mold abnormality detection mechanism of the present invention;

[0020] Figure 6 It is Figure 2 an enlarged schematic diagram of part B in

[0021] Figure 7 It is a schematic structural diagram of Embodiment 2 in another state.

[0022] In the figure: ejector rod sleeve 1, rear through ejector rod 2, proximity switch 3, clamping block 4, adjusting bolt 5, guide rod 6, limiting part 7, switch bracket 8, friction block 9, compression spring 10, adjusting nut 11, punching die 12, mold 13, workpiece 14, backing plate 15, limiting sleeve 16, guide sleeve 17, limiting spring 18, gap 19, stepped hole 40, sleeve 160, limiting edge 161, spring seat 170. Detailed implementation manners

[0023] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, details the specific implementation manners, structures, features and their effects of the present invention as follows.

[0024] Embodiment 1:

[0025] The mold abnormality detection mechanism described in this embodiment, as Figures 1 to 4 shown, includes an ejector rod sleeve 1, a rear through ejector rod 2, a clamping block 4 assembly, a proximity switch 3 and a limiting and guiding assembly. The rear through ejector rod 2 passes through the ejector rod sleeve 1 and is slidably matched with the ejector rod sleeve 1. The clamping block 4 assembly includes at least two clamping blocks 4 and an adjusting bolt 5 connecting the two clamping blocks 4. The two clamping blocks 4 clamp the rear through ejector rod 2. The limiting and guiding assembly includes a guide rod 6 and a limiting part. One end of the guide rod 6 passes through the clamping block 4 and is fixedly connected to the ejector rod sleeve 1. The limiting part is installed on the guide rod 6 and limits the stroke of the clamping block 4. A switch bracket 8 is provided on the ejector rod sleeve 1. The switch bracket 8 is provided with a cantilever, and the cantilever extends towards the limiting part. The proximity switch 3 is arranged at the end of the cantilever, and the probe of the proximity switch 3 is aligned with the end of the clamping block 4 away from the ejector rod sleeve 1.

[0026] To facilitate the adjustment of the friction force between the clamping block 4 assembly and the rear through ejector rod 2, as Figure 3As shown, to avoid the clamping block 4 and the rear through push rod 2 from scratching each other, the clamping block 4 assembly further includes a friction block 9, a compression spring 10, and an adjusting nut 11. The friction block 9 is padded between the clamping block 4 and the rear through push rod 2. The adjusting bolt 5 passes through the clamping block 4 and is connected to the adjusting nut 11. The compression spring 10 is sleeved on the adjusting bolt 5, and both ends of the compression spring 10 are abutted against the adjusting nut 11 and the clamping block 4 respectively. When adjusting the friction force, rotate the adjusting nut 11 and the adjusting bolt 5, which not only changes the tightness of the clamping block 4 but also changes the compression length of the compression spring 10, thereby changing the pressure of the compression spring 10 on the clamping block 4. While adjusting the pressure of the clamping block 4 on the rear through push rod 2, it is possible to prevent the adjusting bolt 5 and the adjusting nut 11 from loosening.

[0027] The mold abnormality detection method described in this embodiment includes using a cold heading machine equipped with the aforementioned mold abnormality detection mechanism. The cold heading machine further includes an equipment system, a punching tool 12, and a mold 13, and includes the following steps:

[0028] a. Turn on the equipment and input the normal working angle (A±B)° of the crankshaft rotation into the equipment system, where A is the expected accurate angle and B is the allowable error. The accurate angle is the angle that the crankshaft of the cold heading machine rotates from the front dead center of the crankshaft to the moment when the clamping block 4 moves to the end of its stroke and is limited by the limiting member.

[0029] b. Operate the equipment. During the operation, the rear through push rod 2 extends into the mold 13, the punching tool 12 impacts the workpiece 14 installed in the mold 13, presses against the rear through push rod 2, and the rear through push rod 2 drives the clamping block 4 to move the clamping block 4 away from the ejector sleeve 1 to the end of the stroke of the clamping block 4. At this time, the clamping block 4 is limited by the limiting member.

[0030] c. At the moment when the clamping block 4 moves to the end of its stroke, the proximity switch 3 detects the clamping block 4 and sends an electrical signal to the equipment system.

[0031] d. After the equipment system receives the electrical signal, it collects the current rotation angle of the crankshaft and compares it with the pre-input normal working angle (A±B)°.

[0032] e. When the rotation angle is within the normal working angle range, the equipment continues to operate; otherwise, the equipment stops abnormally.

[0033] During the actual working process, in actual operation, the angle of the front dead center of the crankshaft of the cold heading machine is set to 0°. The mechanical structure of the cold heading machine will determine the angle X of the crankshaft when it is at the front dead center of the rear through. As Figure 2 shown, when the crankshaft of the cold heading machine is at the front dead center of the crankshaft, the clamping block 4 is located at the right end of its stroke, that is, the starting point of the stroke. When the punching tool 12 impacts and makes the clamping block 4 reach the end of its stroke, as Figure 4At the left end of the stroke, the change amount Y of the crankshaft angle can be obtained. That is, the stroke length of the aforementioned clamping block 4 is related to the change amount Y of the crankshaft angle. Those skilled in the art can determine the stroke length according to the size of the cold heading machine, and further determine the change amount Y and the installation position of the proximity switch. The accurate angle described in step a is A = X + Y.

[0034] At this time, the clamping block 4 is limited by the limiting member and cannot move further. However, the power provided by the die 12 is greater than the frictional force between the clamping block 4 and the rear through push rod 2. Therefore, the rear through push rod 2 will continue to slide relative to the clamping block 4. When the rear through push rod 2 moves in the reverse direction, it will drive the clamping block 4 to return to the right end of its stroke, thus completing a stamping and detection cycle.

[0035] In this embodiment, the limiting member is a limiting block 7.

[0036] The die abnormality detection mechanism and method provided in this embodiment monitor the condition of the die 13 in each stamping cycle by setting a proximity switch 3 and a clamping block 4 that moves a short distance, can timely detect equipment problems and stop the machine in time, ensure safe production, and avoid losses.

[0037] Embodiment 2:

[0038] The die abnormality detection mechanism described in this embodiment, as Figure 5 、 Figure 6 shown, is different from the features described in Embodiment 1 in that in order to ensure the reliable reset of the clamping block 4, the limiting member includes a backing plate 15, a limiting sleeve 16, a guide sleeve 17 and a limiting spring 18. The backing plate 15 is arranged between the push rod sleeve 1 and the clamping block 4. A stepped hole 40 is provided in the clamping block 4. The limiting sleeve 16 is T-shaped and includes a sleeve 160 and a limiting edge 161. The sleeve 160 passes through the stepped hole 40 and is fixedly connected to the backing plate 15. A gap 19 is left between the limiting edge 161 facing the push rod sleeve 1 and the step in the stepped hole 40. The length of the gap 19 is the same as the stroke of the clamping block 4. One end of the guide sleeve 17 abuts against the limiting sleeve 16, and the other end is provided with a spring seat 170. The limiting spring 18 is sleeved outside the guide sleeve 17. One end of the limiting spring 18 abuts against the spring seat 170, and the other end abuts against the clamping block 4. The frictional force between the clamping block 4 and the rear through push rod 2 is greater than the pressure of the limiting spring 18 on the clamping block 4 when the clamping block 4 contacts the cushion block. In this embodiment, due to the presence of the friction block 9, the frictional force between the clamping block 4 and the rear through push rod 2 at this time refers to the frictional force between the friction block 9 and the rear through push rod 2 under the pressure provided by the clamping block 4. Of course, the friction block 9 is only a part provided for the convenience of component maintenance, replacement and frictional force adjustment, and is not a necessary structure for this embodiment to achieve its function.

[0039] For the convenience of disassembly and assembly, the guide rod 6 is a screw and is fixedly connected to the push rod sleeve 1 by thread.

[0040] In actual use, when the rear push rod 2 moves to the left, as Figures 5 to 7 shown, since the frictional force between the clamping block 4 and the rear push rod 2 is greater than the pressure of the limiting spring 18 on the clamping block 4 when the clamping block 4 contacts the cushion block, the clamping block 4 will overcome the pressure of the limiting spring 18 and move leftward, and will ultimately be stopped by the limiting edge 161 of the limiting sleeve 16. Then the rear push rod 2 can continue to move leftward by overcoming the frictional force as Figure 6 shown. When the rear push rod 2 moves to the right, the clamping block 4 moves rightward under the combined action of the limiting spring 18 and the rear push rod 2, and will ultimately be stopped by the cushion block at the right end of its stroke.

[0041] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to equivalent embodiments by using the technical content disclosed above within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for detecting die abnormalities, which includes using a cold heading machine equipped with a die abnormality detection mechanism. The cold heading machine also includes an equipment system, a punch (12) and a die (13). The die abnormality detection mechanism includes a thimble sleeve (1), a rear through thimble (2), a clamp block (4) assembly, a proximity switch (3) and a limit guiding assembly, and is characterized in that The rear through push rod (2) passes through the push rod sleeve (1) and is in sliding fit with the push rod sleeve (1). The clamp block (4) assembly includes at least two clamp blocks (4) and an adjusting bolt (5) connecting the clamp blocks (4). The clamp blocks (4) are clamped on the rear through push rod (2). The limit guiding assembly includes a guiding rod (6) and a limiting member. One end of the guiding rod (6) passes through the clamp block (4) and is fixedly connected to the push rod sleeve (1). The limiting member is installed on the guiding rod (6) to limit the stroke of the clamp block (4). A switch bracket (8) is provided on the push rod sleeve (1). The switch bracket (8) is provided with a cantilever. The cantilever extends towards the limiting member. The proximity switch (3) is arranged at the end of the cantilever. The probe of the proximity switch (3) is aligned with the end of the stroke of the clamp block (4) away from the push rod sleeve (1). The detection steps are as follows: a. The equipment is powered on, and the normal working angle (A±B)° of the crankshaft rotation is input into the equipment system, where A is the expected accurate angle and B is the allowable error. The accurate angle is the angle turned by the cold heading machine crankshaft from the front dead center of the crankshaft to the moment when the clamp block (4) moves to the end of its stroke and is limited by the limiting member. b. The equipment runs. During the running process, the rear through push rod (2) extends into the die (13), and the punch (12) impacts the workpiece (14) installed in the die (13), pressing the rear through push rod (2). The rear through push rod (2) drives the clamp block (4) to move the clamp block (4) away from the push rod sleeve (1) to the end of the stroke of the clamp block (4). At this time, the clamp block (4) is limited by the limiting member. c. At the moment when the clamp block (4) moves to the end of its stroke, the proximity switch (3) detects the clamp block (4) and sends an electrical signal to the equipment system. d. After the equipment system receives the electrical signal, it collects the rotation angle of the current crankshaft and compares it with the pre-input normal working angle (A±B)°. e. When the rotation angle is within the normal working angle range, the equipment continues to run. Otherwise, the equipment stops abnormally.

2. The method for detecting die abnormalities according to claim 1, characterized in that The limiting member includes a backing plate (15), a limiting sleeve (16), a guide sleeve (17), and a limiting spring (18). The backing plate (15) is arranged between the push rod sleeve (1) and the clamp block (4). A stepped hole (40) is provided in the clamp block (4). The limiting sleeve (16) is T-shaped and includes a sleeve (160) and a limiting edge (161). The sleeve (160) passes through the stepped hole (40) and is fixedly connected to the backing plate (15). A gap (19) is left between the limiting edge (161) facing the push rod sleeve (1) and the step in the stepped hole (40). The length of the gap (19) is the same as the stroke of the clamp block (4). One end of the guide sleeve (17) abuts against the limiting sleeve (16), and the other end is provided with a spring seat (170). The limiting spring (18) is sleeved outside the guide sleeve (17). One end of the limiting spring (18) abuts against the spring seat (170), and the other end abuts against the clamp block (4). The frictional force between the clamp block (4) and the rear through push rod (2) is greater than the pressure of the limiting spring (18) on the clamp block (4) when the clamp block (4) contacts the cushion block.

3. The mold abnormality detection method according to claim 1 or 2, characterized in that The guiding rod (6) is a screw and is fixedly connected to the push rod sleeve (1) by threading.

4. The mold abnormality detection method according to claim 1 or 2, characterized in that The clamping block (4) assembly further includes a friction block (9), a compression spring (10), and an adjusting nut (11). The friction block (9) is padded between the clamping block (4) and the rear through push rod (2). The adjusting bolt (5) passes through the clamping block (4) and is connected to the adjusting nut (11). The compression spring (10) is sleeved on the adjusting bolt (5), and both ends of the compression spring (10) are respectively abutted against the adjusting nut (11) and the clamping block (4).

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