A centering detection device for the upper and lower dies of a press and a method thereof

Abstract

The application relates to the technical field of centering, and discloses a centering detection device suitable for upper and lower molds of a press, which comprises a box body, a first adapting part and a second adapting part arranged at two ends of the box body respectively, the inside of the box body is provided with a cavity, and a top hole is formed in the top of the box body; a centering block is arranged in the cavity, one end of the centering block is embedded into the bottom of the first adapting part through the top hole; two reset mechanisms are arranged on the box body, the two reset mechanisms are perpendicular to each other, and are used for measuring the displacement of the centering block in the X-axis and Y-axis directions respectively. The displacement of the centering block in the X-axis and Y-axis directions is measured through the reset mechanisms, the offset between the upper and lower molds of the press is obtained, the upper and lower molds of the press are adjusted based on the offset, the over-adjustment can be prevented, the time-consuming and labor-consuming repeated adjustment depending on experience is avoided, and the debugging efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of alignment technology, and more specifically to an alignment detection device and method applicable to the upper and lower dies of a press. Background Technology

[0002] In the field of automation, it is common to encounter situations where a press is needed to press a shaft-type part into the product body. The press typically completes the production process through the cooperation of an upper die head and a lower die fixture. The upper die head can move axially closer to or further away from the lower die fixture, and a high degree of coaxiality is required between them. Therefore, during debugging, it is necessary to ensure that the upper die head and the lower die fixture are aligned. Currently, a common method to achieve this alignment is to create an alignment fixture that can slide between the positioning holes of the upper die head and the lower die fixture, thus ensuring alignment within a certain tolerance range.

[0003] However, the above-mentioned centering method has the following drawbacks:

[0004] (1) It is impossible to guarantee high coaxial accuracy;

[0005] (2) Adjusting the screws in the X and Y axes relies entirely on eyesight and touch, which is extremely time-consuming and laborious as it tests the operator's experience.

[0006] (3) It is impossible to obtain a quantitative offset value, which makes it difficult to guarantee high-quality production.

[0007] Therefore, there is an urgent need to design an alignment detection device to facilitate the alignment operation of the upper die head and the lower die fixture of the press, thereby meeting the coaxial accuracy requirements between the two. Summary of the Invention

[0008] The problem this invention aims to solve is to provide an alignment detection device suitable for the upper and lower dies of a press. This device is placed between the upper die head and the lower die clamping fixture of the press. Displacement sensors from two sets of reset mechanisms measure the offset values ​​of the upper die head and the lower die clamping fixture in the X and Y directions. Based on these offset values, the relative positions of the two are adjusted to achieve alignment, ensuring the coaxiality of the upper die head and the lower die clamping fixture. Furthermore, this device can record the values ​​of their offset in the X and Y axes, ensuring subsequent production quality.

[0009] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0010] A centering detection device for the upper and lower dies of a press includes a housing and a first adapter and a second adapter respectively disposed at both ends of the housing. The housing has an interior cavity and a top hole is provided at the top of the housing. A centering block is disposed in the cavity, and one end of the centering block passes through the top hole and is embedded in the bottom of the first adapter.

[0011] The housing is provided with two reset mechanisms, which are perpendicular to each other and are used to measure the displacement of the centering block in the X-axis and Y-axis directions, respectively.

[0012] In a preferred embodiment of the present invention, each of the reset mechanisms includes a displacement sensor and a limiting component. The displacement sensor is installed on the side of the housing, with one end extending into the interior of the cavity and connected to a contact head. The contact head and the limiting component are distributed opposite to each other on both sides of the centering block, and both abut against the centering block.

[0013] In a preferred embodiment of the present invention, the box body includes a hollow base, and a cover plate and a bottom plate are fixedly installed at both ends of the base, and the two plates and the base together form the cavity.

[0014] The displacement sensor is mounted on the base, the top hole is formed on the cover plate, and the second adapter is mounted on the bottom of the base plate.

[0015] In a preferred embodiment of the present invention, the limiting component includes a limiting block, the limiting block being movably disposed within the side wall of the base, one end of the limiting block being fixedly connected to a limiting head that abuts against the centering block, and a return spring being disposed between the limiting head and the inner wall of the base.

[0016] In a preferred embodiment of the present invention, a groove is provided at the bottom of the base plate, and the protrusion at the top of the second adapter part can be embedded in the groove.

[0017] In a preferred embodiment of the present invention, a through hole is coaxially formed in the groove, the through hole being located in the middle of the base plate; a bottom hole is formed at the bottom of the centering block, and one end of the zeroing pin can pass through the groove and the through hole in sequence to the bottom hole to reset the centering block.

[0018] In a preferred embodiment of the present invention, an anti-rotation pin is fixedly installed on the bottom of the base plate, an anti-rotation hole is provided at the edge of the second adapter part, and one end of the anti-rotation pin passes through the anti-rotation hole.

[0019] In a preferred embodiment of the present invention, the displacement sensor is mounted on the base by a fixing block, and a bracket is also provided between the fixing block and the displacement sensor.

[0020] In a preferred embodiment of the present invention, the output terminal of the displacement sensor is connected to a digital display amplifier to receive the displacement data of the displacement sensor and display its value.

[0021] A method for aligning the upper and lower dies of a press includes the following steps:

[0022] (A) Reset:

[0023] (I) Before the second adapter part is installed into the base plate, the zeroing pin is passed through the groove and through hole to the bottom hole in sequence. At this time, the offset of the centering block relative to the base plate is zero.

[0024] (II) Set the displacement values ​​of the digital display amplifier in the X-axis and Y-axis directions to zero. At this time, the centering block is located at the center of the base and the bottom plate. Then pull out the zeroing pin to complete the zeroing operation.

[0025] (B) Centering operation:

[0026] (1) Install the first adapter and the second adapter into the cover plate and the bottom plate respectively, so that the upper end of the centering block passes through the top hole into the mounting hole at the bottom of the first adapter, and the protrusion of the second adapter is embedded in the groove, thus completing the preparation of the centering detection device.

[0027] (2) The centering detection device is placed into the lower die fixture of the press through the second adapter part, so that the anti-rotation pin is inserted into the anti-rotation groove of the lower die fixture;

[0028] (3) The upper die head of the press moves down, and at the same time the first adapter part is manually adjusted to fit well with the upper die head. At this time, the offset of the centering block in the X-axis direction and Y-axis direction is measured by the corresponding displacement sensor and displayed by the digital display amplifier.

[0029] (4) Observe the digital display amplifier and adjust the position of the lower mold fixture in the X-axis and Y-axis directions so that the value of the digital display amplifier approaches zero. When the required tolerance range is reached, stop adjusting the lower mold fixture and the centering operation is completed. Beneficial effects

[0030] (1) In this invention, one end of the centering block is connected to the first adapter part, and the other end is located in the cavity of the box body. The bottom of the box body is connected to the second adapter part. The displacement of the centering block in the X-axis and Y-axis directions is measured by the reset mechanism, and the offset between the upper and lower dies of the press can be obtained. Then, the upper and lower dies of the press are adjusted based on the offset, which can prevent over-adjustment, avoid the time-consuming and laborious repeated adjustments based on experience, and improve the efficiency of debugging.

[0031] (2) In this invention, the offset value of the centering block measured by the displacement sensor can be read in real time through the digital display amplifier, thereby ensuring the coaxiality between the upper and lower molds, and the centering data can be quantified and recorded to meet the requirements of high-quality production.

[0032] (3) In this invention, for presses of different specifications, only the appropriate first and second adapter parts need to be adjusted and replaced to perform centering detection using this device, which greatly improves the adaptability of the device. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the structure of the present invention;

[0034] Figure 2 This is an exploded structural diagram of the present invention;

[0035] Figure 3 This is a schematic diagram of the reset mechanism of the present invention;

[0036] Figure 4 This is a schematic diagram of the assembly structure of the middle block and the first adapter part of the present invention;

[0037] Figure 5 This is a schematic diagram of the zero-adjustment pin passing through the base plate in this invention;

[0038] Figure 6 This is a schematic diagram of the zero-adjustment pin and bottom hole of the present invention;

[0039] Figure 7 This is a schematic diagram of the structure of the center block of the present invention;

[0040] Figure 8 This is a schematic diagram showing the positional structure of the upper die pressure head and the lower die clamping fixture of the present invention;

[0041] Figure 9 This is a schematic diagram of the adjustment mechanism of the present invention;

[0042] Figure 10 This is a top view of the adjustment mechanism of the present invention;

[0043] The components are as follows: 1. Box body; 11. Base; 12. Bottom plate; 121. Groove; 122. Through hole; 13. Cover plate; 131. Top hole; 14. Cavity; 15. Centering block; 151. Bottom hole; 2. Reset mechanism; 21. Displacement sensor; 22. Contact head; 23. Fixing block; 24. Bracket; 25. Limiting block; 26. Limiting head; 27. Reset spring; 3. First adapter part; 31. Mounting hole; 4. Second adapter part; 41. Anti-rotation hole; 5. Anti-rotation pin; 6. Zeroing pin; 7. Upper mold pressure head; 8. Lower mold fixture; 9. Adjustment mechanism; 91. Support plate; 92. Y-axis adjustment plate; 93. X-axis adjustment plate; 94. Adjustment assembly; 95. Oblong hole. Detailed Implementation

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. These drawings are simplified schematic diagrams, which are only used to illustrate the basic structure of the present invention and therefore only show the components relevant to the present invention. Example 1

[0045] like Figure 1-2As shown, an alignment detection device suitable for the upper and lower dies of a press includes a housing 1, a first adapter 3, a second adapter 4, and two reset mechanisms 2. The first adapter 3 and the second adapter 4 are respectively disposed at the upper and lower ends of the housing 1. The housing 1 has a cavity 14 inside and a top hole 131 is provided at the top. An alignment block 15 is disposed in the cavity 14, and one end of the alignment block 15 passes through the top hole 131 and is embedded in the bottom of the first adapter 3. The two reset mechanisms 2 are disposed perpendicularly to each other on the housing 1 and are used to measure the displacement of the alignment block 15 in the X-axis and Y-axis directions, respectively.

[0046] As described above, the centering block 15 has a stepped structure along the axial direction, and the diameter of the part passing through the top hole 131 is smaller than the diameter of the top hole 131, so that the centering block 15 can move horizontally along the X and Y axes within the cavity 14; and the outer periphery of the larger diameter part of the centering block 15 consists of four planes connected end to end, and there is a rounded corner structure between adjacent planes (such as... Figure 7 (As shown).

[0047] Specifically, one end of the centering block 15 is connected to the first adapter part 3, and the other end is located in the cavity 14 of the box body 1. The bottom of the box body 1 is connected to the second adapter part 4. When the detection device is placed between the upper and lower dies of the press, the first adapter part 3 is connected to its upper die pressure head 7, and the second adapter part 4 is connected to its lower die clamping fixture 8. The centering block 15 is offset relative to the device before it is installed in the press. This offset is measured by the reset mechanism 2. The two reset mechanisms 2 are perpendicular to each other in the horizontal plane, and the displacement of the centering block 15 in the X-axis and Y-axis directions can be measured to obtain the offset between the upper and lower dies of the press. The position of the lower die clamping fixture 8 is then adjusted according to the offset until the offset in the corresponding direction approaches zero and falls within the allowable error range, thereby completing the centering operation between the upper and lower dies of the press. This device can prevent over-adjustment, avoid the time-consuming and laborious process of repeated adjustments based on experience, and improve the efficiency of debugging.

[0048] Furthermore, the box body 1 includes a hollow base 11, with a cover plate 13 and a bottom plate 12 fixedly installed at both ends of the base 11, and the two together with the base 11 form a cavity 14; the box body 1 adopts this structure, which can facilitate the assembly of the reset mechanism 2 and ensure that subsequent maintenance is more convenient and quick.

[0049] like Figure 2-4 Each reset mechanism 2 includes a displacement sensor 21 and a limiting component. The displacement sensor 21 is installed on the side of the housing 1, with one end extending into the cavity 14 and connected to a contact head 22. The contact head 22 and the limiting component are distributed opposite to each other on both sides of the centering block 15, and both abut against the centering block 15.

[0050] The aforementioned limiting component includes a limiting block 25, which is movably inserted into the side wall of the base 11. One end of the limiting block 25 is fixedly connected to a limiting head 26 that abuts against the centering block 15, and a return spring 27 is provided between the limiting head 26 and the inner wall of the base 11.

[0051] The limiting block 25 and the limiting head 26 are integrally formed and have a stepped shaft structure. The diameter of the limiting head 26 is larger than that of the limiting block 25. Under the action of the reset spring 27, it can move axially with the centering block 15 to ensure that the limiting component is always in contact with one side of the centering block 15. The displacement sensor 21 is mounted on the base 11. Its detection end has a spring for reset. That is, its detection end and the contact head 22 can also move with the movement of the centering block 15, and the contact head 22 is always in contact with the side of the centering block 15.

[0052] Since the contact head 22 and the limiting head 26 of each reset mechanism 2 are attached to the opposite sides of the centering block 15, the two mutually perpendicular reset mechanisms 2 can limit the centering block 15 in the X-axis and Y-axis directions in the horizontal plane, so that it can only move horizontally under the support of the base plate 12.

[0053] Furthermore, the output of the displacement sensor 21 is connected to a digital display amplifier to receive the displacement data from the displacement sensor 21 and display its value. Both the displacement sensor 21 and the digital display amplifier are existing technologies, and the latter can receive the displacement data measured by the displacement sensor 21 and display it for the user to read.

[0054] Both the digital display amplifier and the displacement sensor 21 are existing technologies. They are connected by a cable. The former is used to display the displacement value of the displacement sensor 21, and one displacement sensor 21 corresponds to one digital display amplifier. Therefore, the entire centering detection device contains two digital display amplifiers.

[0055] In addition, the displacement sensor 21 is mounted on the base 11 via a fixing block 23, and a bracket 24 is provided between the fixing block 23 and the displacement sensor 21. The fixing block 23 is fixedly mounted on the outside of the base 11 with screws, and the bracket 24 is a bushing structure that is sleeved on the displacement sensor 21 to prevent the sensor from being bent or damaged due to force on one end.

[0056] like Figure 4-7 As shown, the second adapter part 4 is installed on the bottom of the base plate 12, the top hole 131 is opened on the cover plate 13, and the bottom of the base plate 12 is provided with a groove 121. The protrusion on the top of the second adapter part 4 can be embedded in the groove 121, which facilitates the quick assembly between the two.

[0057] A through hole 122 is coaxially formed in the groove 121, which passes through the base plate 12. The through hole 122 is located in the middle of the base plate 12. A bottom hole 151 is formed at the bottom of the centering block 15, and one end of the zeroing pin 6 can pass through the groove 121 and the through hole 122 in sequence to the bottom hole 151 to reset the centering block 15.

[0058] Specifically, before the second adapter part 4 is installed into the base plate 12, the zeroing pin 6 is passed through the groove 121 and the through hole 122 to the bottom hole 151 in sequence. At this time, the offset of the centering block 15 relative to the base plate 12 is zero. The displacement values ​​of the X-axis and Y-axis of the digital display amplifier are set to zero. At this time, the centering block 15 is located at the center of the base 11 and the base plate 12. Then the zeroing pin 6 is pulled out to complete the zeroing operation.

[0059] Furthermore, an anti-rotation pin 5 is fixedly installed on the bottom of the base plate 12, and an anti-rotation hole 41 is provided at the edge of the second adapter part 4, with one end of the anti-rotation pin 5 passing through the anti-rotation hole 41.

[0060] One end of the anti-rotation pin 5 is fixedly connected to the base plate 12, and the other end passes through the anti-rotation hole 41 and can be inserted into the anti-rotation groove on the top of the lower mold fixture 8. Its function is to prevent the centering detection device from deflecting under force during the centering process, which would affect the final displacement measurement accuracy and effect.

[0061] During alignment, the anti-rotation pin 5 is inserted into the anti-rotation groove of the lower mold fixture 8. The length direction of the anti-rotation groove is parallel to the Y-axis, which ensures that the extension and retraction directions of the two displacement sensors 21 are parallel to the X and Y axes of the lower mold, respectively. Example 2

[0062] Based on the alignment detection device for the upper and lower dies of a press disclosed in Embodiment 1, the present invention also provides an alignment method for the upper and lower dies of a press, comprising the following steps:

[0063] (A) Reset:

[0064] (I) Before the second adapter part 4 is installed into the base plate 12, the zeroing pin 6 is passed through the groove 121 and the through hole 122 to the bottom hole 151 in sequence. At this time, the offset of the centering block 15 relative to the base plate 12 is zero.

[0065] (II) Set the displacement values ​​of the digital display amplifier in the X-axis and Y-axis directions to zero. At this time, the centering block 15 is located at the center of the base 11 and the base plate 12. Then pull out the zeroing pin 6 to complete the zeroing operation.

[0066] (B) Centering operation:

[0067] (1) The first adapter 3 and the second adapter 4 are respectively installed into the cover plate 13 and the bottom plate 12, so that the upper end of the centering block 15 passes through the top hole 131 to the mounting hole 31 at the bottom of the first adapter 3, and the protrusion of the second adapter 4 is embedded in the groove 121, thus completing the preparation of the centering detection device.

[0068] (2) The centering detection device is placed into the lower die clamping fixture 8 of the press through the second adapter part 4, so that the anti-rotation pin 5 is inserted into the anti-rotation groove of the lower die clamping fixture 8;

[0069] (3) The upper die head 7 of the press moves down, and at the same time the first adapter part 3 is manually adjusted to fit with the upper die head 7. At this time, the offset of the centering block 15 in the X-axis direction and Y-axis direction is measured by the corresponding displacement sensor 21 and displayed by the digital display amplifier.

[0070] (4) Observe the digital display amplifier and adjust the position of the lower mold fixture 8 in the X-axis and Y-axis directions so that the value of the digital display amplifier approaches zero. When the required tolerance range is reached, stop adjusting the lower mold fixture 8 and the centering operation is completed.

[0071] like Figure 8-10 As shown, the position of the lower die clamp 8 in the horizontal plane can be adjusted by adjusting mechanism 9, so that the operator can complete the alignment operation between the upper and lower dies of the press based on the alignment detection device.

[0072] The adjustment mechanism 9 includes a Y-axis adjustment plate 92 mounted on the support plate 91, and an X-axis adjustment plate 93 mounted on the Y-axis adjustment plate 92, which is used to support the lower mold fixture 8. The Y-axis adjustment plate 92 is connected to the support plate 91 and the X-axis adjustment plate 93 through a fit between an elongated hole 95 and a screw. Before being fixed, both the X-axis adjustment plate 93 and the Y-axis adjustment plate 92 can move along the X and Y axes, respectively. The support plate 91 is equipped with an adjustment component 94 for adjusting the Y-axis adjustment plate 92 in the Y-axis direction, and the Y-axis adjustment plate 92 is equipped with an adjustment component 94 for adjusting the X-axis adjustment plate 93 in the X-axis direction.

[0073] As described above, both adjustment components 94 include a support plate, on which an adjustment screw is screwed, and the corresponding adjustment screws abut against the Y-axis adjustment plate 92 and the X-axis adjustment plate 93 respectively; by rotating the adjustment screws, they can be controlled to move axially on the support plate, thereby controlling the corresponding adjustment plate to move in a specified direction, thereby realizing the horizontal position adjustment of the lower mold clamp 8 relative to the upper mold pressure head 7.

[0074] Working principle:

[0075] Reset method: The displacement sensor 21 (with its own reset spring), the contact head 22, the limit block 25, and the reset spring 27 form a set of reset mechanisms 2, which move the centering block 15 toward the center of the base 11. Under the action of the two sets of mutually perpendicular reset mechanisms 2, the centering block 15 will tend to be centered relative to the base 11 without the action of external force (it is not necessary to ensure that the centering block 15 is accurately centered here).

[0076] Zeroing operation: Before the second adapter part 4 is installed into the base plate 12, the zeroing pin 6 is passed through the groove 121 and the through hole 122 to the bottom hole 151 in sequence. At this time, the offset of the centering block 15 relative to the base plate 12 is zero. The displacement values ​​of the X-axis and Y-axis of the digital display amplifier are set to zero. At this time, the centering block 15 is located at the center of the base 11 and the base plate 12. Then the zeroing pin 6 is pulled out, and the zeroing operation is completed.

[0077] Operations in the center:

[0078] The first adapter 3 and the second adapter 4 are respectively installed into the cover plate 13 and the bottom plate 12, so that the upper end of the centering block 15 passes through the top hole 131 to the mounting hole 31 at the bottom of the first adapter 3, and the protrusion of the second adapter 4 is embedded in the groove 121, thus completing the preparation of the centering detection device.

[0079] Then, move the upper die head 7 of the press upward to a height sufficient to insert the centering detection device, align the second adapter part 4 of the detection device with the lower die clamp 8, and ensure that the anti-rotation pin 5 is aligned with the anti-rotation groove of the lower die clamp 8, and finally place the detection device on the lower die clamp 8.

[0080] After the centering detection device is placed into the lower die clamp 8, the upper die pressure head 7 descends. At the same time, the first adapter part 3 is moved by hand to ensure that it smoothly enters the inner hole of the upper die pressure head 7. The descent of the pressure head is stopped when it has entered 4-6mm.

[0081] Based on the offset value displayed by the digital display amplifier, adjust the X and Y axis adjustment screws respectively so that the value of displacement sensor 21 displayed by the digital display amplifier tends to zero. When a certain allowable tolerance range is reached, the coaxiality of the upper die pressure head 7 and the lower die clamp 8 is within the tolerance range, and the centering operation is completed.

[0082] In summary, by placing the alignment detection device between the lower die clamp 8 and the upper die pressure head 7, and reading the offset values ​​of the upper die pressure head 7 and the lower die clamp 8 in the X-axis and Y-axis directions from the digital display amplifier, and then gradually reducing the offset values ​​by turning the adjusting screws in the X-axis and Y-axis directions, the offset values ​​are eventually kept within a tolerance range, thereby achieving the purpose of alignment, ensuring the coaxiality of the upper die pressure head 7 and the lower die clamp 8, and recording the values ​​of their offset in the X and Y axes to ensure the quality of subsequent production.

[0083] Furthermore, the first adapter part 3 and the second adapter part 4 of the device will change due to the shape and size of the upper die head 7 and the lower die clamp 8, while the remaining parts will not change due to the upper die head 7 and the lower die clamp 8; the centering accuracy depends on the accuracy of the displacement sensor 21 and the machining and assembly accuracy of the remaining parts of the entire structure.

[0084] Based on the preferred embodiments of the present invention described above, those skilled in the art can make various changes and modifications without departing from the inventive concept. The technical scope of this invention is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A centering detection device suitable for the upper and lower dies of a press, characterized in that: The device includes a box body (1) and a first adapter (3) and a second adapter (4) respectively disposed at both ends of the box body (1). The box body (1) has an interior cavity (14) and a top hole (131) is provided on the top of the box body (1). A centering block (15) is disposed in the cavity (14), and one end of the centering block (15) passes through the top hole (131) and is embedded in the bottom of the first adapter (3). The box (1) is provided with two reset mechanisms (2), which are perpendicular to each other and are used to measure the displacement of the centering block (15) in the X-axis and Y-axis directions, respectively. Each of the reset mechanisms (2) includes a displacement sensor (21) and a limiting component. The displacement sensor (21) is installed on the side of the housing (1), with one end extending into the cavity (14) and connected to a contact head (22). The contact head (22) and the limiting component are distributed opposite to each other on both sides of the centering block (15), and both abut against the centering block (15). The box body (1) includes a hollow base (11), and a cover plate (13) and a bottom plate (12) are fixedly installed at both ends of the base (11), and the two together with the base (11) form the cavity (14). The displacement sensor (21) is mounted on the base (11), the top hole (131) is opened on the cover plate (13), and the second adapter (4) is mounted on the bottom of the base plate (12); The limiting component includes a limiting block (25), which is movably inserted into the side wall of the base (11). One end of the limiting block (25) is fixedly connected to a limiting head (26) that abuts against the centering block (15), and a return spring (27) is provided between the limiting head (26) and the inner wall of the base (11). The bottom of the base plate (12) is provided with a groove (121), and the protrusion on the top of the second adapter part (4) can be embedded in the groove (121).

2. The alignment detection device for the upper and lower dies of a press according to claim 1, characterized in that: The groove (121) is coaxially provided with a through hole (122) that passes through the base plate (12), and the through hole (122) is located in the middle of the base plate (12); the centering block (15) is provided with a bottom hole (151), and one end of the zeroing pin (6) can pass through the groove (121) and the through hole (122) in sequence to the bottom hole (151) to reset the centering block (15).

3. The alignment detection device for the upper and lower dies of a press according to claim 2, characterized in that: An anti-rotation pin (5) is fixedly installed on the bottom of the base plate (12), and an anti-rotation hole (41) is provided at the edge of the second adapter part (4), and one end of the anti-rotation pin (5) passes through the anti-rotation hole (41).

4. The alignment detection device for the upper and lower dies of a press according to claim 1, characterized in that: The displacement sensor (21) is mounted on the base (11) by a fixing block (23), and a bracket (24) is provided between the fixing block (23) and the displacement sensor (21).

5. The alignment detection device for the upper and lower dies of a press according to claim 4, characterized in that: The output terminal of the displacement sensor (21) is connected to a digital display amplifier to receive the displacement data of the displacement sensor (21) and display its value.

6. A method for aligning the upper and lower dies of a press, employing the alignment detection device described in any one of claims 1-5, characterized in that, Includes the following steps: (A) Reset: (I) Before the second adapter part (4) is installed into the base plate (12), the zeroing pin (6) is passed through the groove (121) and through hole (122) to the bottom hole (151) in sequence. At this time, the offset of the center block (15) relative to the base plate (12) is zero. (II) Set the displacement values ​​of the digital display amplifier in the X-axis and Y-axis directions to zero. At this time, the center block (15) is located at the center of the base (11) and the bottom plate (12). Then pull out the zeroing pin (6) to complete the zeroing operation. (B) Centering operation: (1) Install the first adapter (3) and the second adapter (4) into the cover plate (13) and the bottom plate (12) respectively, so that the upper end of the centering block (15) passes through the top hole (131) to the mounting hole (31) at the bottom of the first adapter (3), and the protrusion of the second adapter (4) is embedded in the groove (121) to complete the preparation of the centering detection device; (2) The centering detection device is placed into the lower die clamp (8) of the press through the second adapter part (4), so that the anti-rotation pin (5) is inserted into the anti-rotation groove of the lower die clamp (8); (3) The upper die head (7) of the press moves down, and at the same time, the first adapter part (3) is manually adjusted to fit with the upper die head (7). At this time, the offset of the centering block (15) in the X-axis direction and Y-axis direction is measured by the corresponding displacement sensor (21) and displayed by the digital display amplifier. (4) Observe the digital display amplifier and adjust the position of the lower mold fixture (8) in the X-axis and Y-axis directions so that the value of the digital display amplifier approaches zero. When the required tolerance range is reached, stop adjusting the lower mold fixture (8) and the centering operation is completed.

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