A device for detecting ejector pin avoidance in the lower die holder of a drawing die.

Abstract

This utility model discloses a push rod avoidance detection device for the lower die base of a drawing die, including a lower die base with avoidance holes for push rods to pass through. The lower die base has at least two first positioning holes. It also includes a detection plate assembly covering the lower surface of the lower die base, with at least two positioning pins for passing through the first positioning holes to position the detection plate assembly on the lower die base. The detection plate assembly has detection holes, each corresponding to a push rod. It also includes a detection rod for passing through the detection holes into the push rods. The advantages are: the detection plates ensure the detection rod is inserted vertically into the push rod, thus increasing detection accuracy; the detection rod allows potential interference problems to be detected before the die is installed, avoiding rework and production delays; and the detection device is simple to operate.

Description

Technical Field

[0001] This utility model relates to the field of stamping die technology, specifically to an ejector pin avoidance detection device for the lower die base of a drawing die. Background Technology

[0002] The processing and manufacturing of automotive body panels mainly involves drawing and stamping processes. In this process, the drawing dies are typically mounted on an ejector press. Since the ejector pins on the ejector press table are ejected simultaneously during the stamping process, clearance holes are usually provided at corresponding positions on the lower die holder to avoid interference with the drawing die.

[0003] In current technological practices, to reduce the risk of interference between the ejector pin and the lower mold base, a common practice is to intentionally increase the size of the clearance hole during the mold design or casting stage, making it much larger than the actual diameter of the ejector pin. Although this method can avoid interference to some extent, it significantly weakens the overall structural strength and rigidity of the lower mold base, affecting the mold's service life and forming stability.

[0004] While precisely designing or casting the clearance hole size according to the actual dimensions of the ejector pin can maintain the strength of the mold base, the lack of effective clearance detection methods often leads to interference between the ejector pin and the lower mold base during actual installation and debugging. Once interference occurs, the lower mold base must be removed from the press and re-machined to enlarge the clearance hole size. This rework process is not only cumbersome and time-consuming, but also significantly increases mold manufacturing costs and production cycles, severely impacting production efficiency and equipment utilization. Utility Model Content

[0005] In view of this, the present invention provides an ejector pin clearance detection device for the lower die holder of a drawing die, which can quickly determine whether the clearance hole of the lower die holder meets the clearance requirements, and at the same time reduce costs.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] A device for detecting ejector pin clearance in a lower die holder of a drawing die includes a lower die holder with clearance holes for ejector pins to pass through. The lower die holder also has at least two first positioning holes. The device is characterized by further including a detection plate assembly covering the lower surface of the lower die holder. The detection plate assembly has at least two positioning pins that pass through the first positioning holes, allowing the detection plate assembly to be positioned on the lower die holder. The detection plate assembly has detection holes that correspond one-to-one with the clearance holes. The device also includes a detection rod that passes through the detection holes into the clearance holes.

[0008] With the above structure, the ejector rod clearance detection device for the lower die base of the drawing die provided by this utility model is used. By inserting the detection rod into the corresponding clearance hole from each detection hole in sequence, if it can be successfully inserted into the clearance hole, it means that the clearance hole is qualified; otherwise, it is unqualified. Therefore, the detection rod can detect potential interference problems before the die is put on the machine, avoiding rework and production delays. Moreover, the detection device is simple to operate and has low cost.

[0009] Preferably, the detection plate assembly has a number of second positioning holes corresponding to the number of the first positioning holes, with each second positioning hole corresponding to one of the first positioning holes. The positioning pin passes through the first and second positioning holes. This structure ensures the detection plate assembly is stably mounted on the lower mold base, thus facilitating obstacle avoidance during detection.

[0010] Preferably, the detection plate assembly is composed of multiple detection plates sequentially spliced ​​together. This structure allows for the selection of the appropriate number of detection plates based on the cross-sectional dimensions of the lower mold base, offering high flexibility. Furthermore, the detection plates are easier to manufacture compared to a single large detection plate assembly.

[0011] Preferably, the detection plate assembly includes a front plate, an end plate, and several intermediate plates spliced ​​between the front and end plates. The front ends of the end plates and each of the intermediate plates are provided with outwardly extending protrusions, and the rear ends of the front plates and each of the intermediate plates are provided with inwardly recessed positioning grooves. Using this structure, the protrusions and positioning grooves can be used to quickly assemble the individual detection plates into a detection plate assembly.

[0012] Preferably, the second positioning holes are distributed on the front and rear plates. This structure allows for more accurate positioning and installation of the detection plate assembly.

[0013] Preferably, the front end plate, the end plate, and the middle plate are all made of thin plastic sheets. This structure helps reduce the investment cost of the detection device.

[0014] Preferably, the testing rod includes a testing section and a handheld section. The diameter of the testing section is adapted to the diameter of the push rod on the table of the full push rod press, and the diameter of the handheld section is larger than the diameter of the testing section. With this structure, the handheld section facilitates the operator's gripping of the testing rod for testing.

[0015] Preferably, the length of the detection segment is greater than or equal to the distance between the upper end of the detection hole and the lower end of the clearance hole. This structure ensures that the detection rod can penetrate to the very bottom of the clearance hole, thereby ensuring detection accuracy.

[0016] Preferably, the end of the detection section away from the handheld section has a chamfer. This structure facilitates the detection section extending downwards into the clearance hole.

[0017] Compared with the prior art, the beneficial effects of this utility model are:

[0018] 1. The ejector rod clearance detection device for the lower die base of the drawing die provided by this utility model is used to insert the detection rod into the corresponding clearance hole from each detection hole in sequence. If it can be successfully inserted into the clearance hole, it means that the clearance hole is qualified; otherwise, it is unqualified. Therefore, the detection rod can detect potential interference problems before the die is put on the machine, avoiding rework and production delays. Moreover, the detection device is simple to operate and has low cost.

[0019] 2. Covering the lower mold base with the detection plate assembly provides a vertical reference plane for the insertion axis of the detection rod. This not only enables efficient and rapid detection of the position and dimensional accuracy of the hole, but also detects defects such as tilting of the hole wall. Attached Figure Description

[0020] Figure 1 This is a reference diagram showing the actual usage of the top rod avoidance detection device;

[0021] Figure 2 This is a schematic diagram of the lower mold base 1;

[0022] Figure 3 To show the structural diagram of the bottom surface of the lower mold base 1;

[0023] Figure 4 An exploded view of the test panel 2 (extra intermediate panel c has been hidden);

[0024] Figure 5 This is a schematic diagram of the structure of the detection rod 3;

[0025] Figure 6 This is a schematic diagram of the structure of the table 5 and the ejector rod 6 of the all-push-rod press. Detailed Implementation

[0026] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0027] like Figures 1 to 6As shown, a push rod avoidance detection device for a lower die base of a drawing die includes a lower die base 1 with avoidance holes 1b distributed on its surface for push rods 6 to pass through. The lower die base 1 also has at least two first positioning holes 1a formed thereon. It also includes a detection plate assembly 2 covering the lower surface of the lower die base 1, with at least two positioning pins 4 provided on the detection plate assembly 2. The positioning pins 4 are used to pass through the first positioning holes 1a so that the detection plate assembly 2 is positioned and installed on the lower die base 1. The detection plate assembly 2 has detection holes 2b distributed on it. After the detection plate assembly 2 is positioned on the lower die base 1 by the positioning pins 4, the detection holes 2b correspond one-to-one with the avoidance holes 1b. It also includes a detection rod 3 for passing through the detection holes 2b into the avoidance holes 1b.

[0028] In use, the lower mold base 1 is first placed upside down, and then the positioning pin 4 is inserted into the first positioning hole 1a so that the detection plate 2 can be quickly positioned and installed on the lower mold base 1. Finally, the detection rod 3 is inserted into the corresponding clearance hole 1b from each detection hole 2b in sequence.

[0029] With this design, if the test bar 3 can be smoothly inserted into the clearance hole 1b, it means that the clearance hole 1b is qualified; otherwise, it means that there is a dimensional error in the clearance hole in terms of position and diameter. Therefore, the test bar 3 can detect potential interference problems before the mold is put on the machine, avoiding rework and production delays. Moreover, the test device is simple to operate and has low cost.

[0030] During the casting stage of the lower mold base 1, some clearance holes 1b inevitably become skewed. Although the diameter of these clearance holes 1b is compatible with the diameter of the detection rod 3, the skewed clearance holes 1b are still unqualified and will still cause interference during use. The detection plate 2 ensures that the detection rod 3 is always inserted vertically into the clearance hole 1b, which helps to increase the detection accuracy.

[0031] In this embodiment, the detection plate assembly 2 has a number of second positioning holes 2a corresponding to the number of first positioning holes 1a. The second positioning holes 2a correspond one-to-one with the first positioning holes 1a, and the positioning pins 4 pass through the first positioning holes 1a and the second positioning holes 2a. This ensures that the detection plate assembly 2 is stably installed on the lower mold base 1, thereby facilitating obstacle avoidance detection.

[0032] Furthermore, the detection plate group 2 is composed of multiple detection plates spliced ​​together in sequence. This design allows for the selection of the corresponding number of detection plates according to the specific cross-sectional dimensions of the lower mold base 1, which is highly flexible. In addition, the detection plates are easier to process than a single large detection plate group 2.

[0033] Specifically, such as Figure 4As shown, the detection plate assembly 2 includes a front plate a, an end plate b, and several intermediate plates c spliced ​​between the front plate a and the end plate b. The front ends of the end plate b and each intermediate plate c are provided with outwardly extending protrusions 2c, and the rear ends of the front plate a and each intermediate plate c are provided with inwardly recessed positioning grooves 2d. This design, through the cooperation of the protrusions 2c and the positioning grooves 2d, allows the individual detection plates to be quickly assembled into the detection plate assembly 2.

[0034] In this embodiment, the detection board group 2 is composed of five detection boards spliced ​​together, specifically a front plate a, an end plate b, and three middle plates c.

[0035] Furthermore, the second positioning holes 2a are distributed on the front plate a and the end plate b. This design allows for more accurate positioning and installation of the detection plate assembly 2.

[0036] In this embodiment, the front plate a, the end plate b, and the middle plate c are all thin plastic sheets. This not only reduces the production cost of the entire detection device, but also makes it easier and less strenuous to install on the lower mold base 1 when avoidance detection is required.

[0037] like Figure 5 As shown, the testing rod 3 includes a testing section 3a and a handheld section 3b. The diameter of the testing section 3a is adapted to the diameter of the push rod 6 on the table 5 of the full push rod press, while the diameter of the handheld section 3b is larger than that of the testing section 3a. This design, with the diameter of the testing section 3a adapted to the diameter of the push rod 6 on the table 5 of the full push rod press, ensures that the clearance hole 1b, after passing the inspection by the testing device, will not interfere with normal use. The handheld section 3b also facilitates the inspection personnel in gripping the testing rod 3 for inspection.

[0038] Furthermore, the length of the detection segment 3a is greater than or equal to the distance between the upper end of the detection hole 2b and the lower end of the clearance hole 1b. This design ensures that the detection rod 3 can be inserted to the bottom of the clearance hole 1b, thereby ensuring detection accuracy.

[0039] like Figure 5 As shown, a chamfer 3a1 is provided at the end of the detection section 3a away from the handheld section 3b. The chamfer 3a1 makes it easier for the detection section 3a to penetrate deeper into the clearance hole 1b.

[0040] In this embodiment, the diameter of the detection hole 2b is slightly larger than the diameter of the detection section 3a, with a specific difference of no more than 1mm. This design allows the detection rod 3 to be quickly inserted into the detection hole 2a.

[0041] Finally, it should be noted that the above description is merely a preferred embodiment of the present utility model. Those skilled in the art, under the guidance of the present utility model, can make various similar representations without departing from the spirit and claims of the present utility model, and such modifications all fall within the protection scope of the present utility model.

Claims

1. A device for detecting ejector pin clearance in a lower die holder of a drawing die, comprising a lower die holder (1), wherein the lower die holder (1) has clearance holes (1b) distributed thereon for ejector pins to pass through, and the lower die holder (1) is provided with at least two first positioning holes (1a), characterized in that: It also includes a detection plate assembly (2) covering the lower surface of the lower mold base (1). The detection plate assembly (2) is provided with at least two positioning pins (4). The positioning pins (4) are used to pass through the first positioning hole (1a) so that the detection plate assembly (2) is positioned and installed on the lower mold base (1). The detection plate assembly (2) is provided with detection holes (2b), and the detection holes (2b) correspond one-to-one with the clearance holes (1b). It also includes a detection rod (3), which is used to pass through the detection hole (2b) into the clearance hole (1b).

2. The ejector pin avoidance detection device for the lower die holder of a drawing die according to claim 1, characterized in that: The detection plate group (2) has a number of second positioning holes (2a) that correspond to the number of the first positioning holes (1a). The second positioning holes (2a) correspond one-to-one with the first positioning holes (1a). The positioning pin (4) passes through the first positioning hole (1a) and the second positioning hole (2a).

3. The ejector pin avoidance detection device for the lower die holder of a drawing die according to claim 2, characterized in that: The detection plate group (2) is composed of multiple detection plates spliced ​​together in sequence.

4. The ejector pin avoidance detection device for the lower die holder of a drawing die according to claim 3, characterized in that: The detection plate assembly (2) includes a front plate (a), an end plate (b), and several intermediate plates (c) spliced ​​between the front plate (a) and the end plate (b). The front ends of the end plate (b) and each of the intermediate plates (c) are provided with outwardly extending protrusions (2c), and the rear ends of the front plate (a) and each of the intermediate plates (c) are provided with inwardly recessed positioning grooves (2d).

5. The ejector pin avoidance detection device for the lower die holder of a drawing die according to claim 4, characterized in that: The second positioning hole (2a) is distributed on the front end plate (a) and the end end plate (b).

6. The ejector pin avoidance detection device for the lower die holder of a drawing die according to claim 4, characterized in that: The front end plate (a), the end plate (b), and the middle plate (c) are all thin plastic sheets.

7. The ejector pin avoidance detection device for the lower die holder of a drawing die according to claim 1, characterized in that: The detection rod (3) includes a detection section (3a) and a handheld section (3b). The diameter of the detection section (3a) is adapted to the diameter of the push rod on the table of the full push rod press, and the diameter of the handheld section (3b) is larger than the diameter of the detection section (3a).

8. The ejector pin avoidance detection device for the lower die holder of a drawing die according to claim 7, characterized in that: The length of the detection segment (3a) is greater than or equal to the distance between the upper end of the detection hole (2b) and the lower end of the clearance hole (1b).

9. The ejector pin avoidance detection device for the lower die holder of a drawing die according to claim 8, characterized in that: The detection section (3a) has a chamfer (3a1) at the end away from the handheld section (3b).

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