Positioning pin assembly capable of detecting breakage of positioning pin

Abstract

The utility model discloses a locating pin assembly capable of detecting the fracture of locating pin, which comprises a locating pin main body, the bottom of the locating pin main body is fixedly connected with a locating pin main body mounting seat, the center of the locating pin main body is provided with a mounting hole along the axial direction, and a straight steel wire is arranged in the mounting hole. The bottom end of the mounting hole penetrates through the positioning pin body mounting seat, the bottom end of the straight steel wire extends out of the mounting hole and is fixedly connected with a magnet, a steel wire limiting seat is mounted at the bottom of the positioning pin body mounting seat, the steel wire limiting seat is connected to the outer side of the straight steel wire in a sleeving mode, and an upper contact is mounted at the bottom of the steel wire limiting seat. According to the utility model, the breakage of the positioning pin in the die can be found in time, the problems of product positioning failure, die damage and the like caused by the breakage of the positioning pin are avoided, the generation of waste products is avoided, and the high die maintenance cost is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of molds, and particularly to a positioning pin assembly capable of detecting the fracture of a positioning pin. Background Technique

[0002] Hot stamping forming is abbreviated as hot forming. The hot forming steel plate (with a tensile strength of about 550 MPa) is heated to above 900 °C by a heating furnace. At high temperature, the metallographic structure of the steel plate changes to austenite. After the steel plate is heated and taken out of the furnace, it is transported to the mold by an automatic clamp. There are 2 positioning pins on the mold surface, and there are two corresponding positioning holes on the steel plate (the main and auxiliary positioning holes respectively). The steel plate is matched with the positioning pins through the positioning holes on the mold to ensure the stable and accurate position of the steel plate on the mold. Then, it is pressed by a hot forming mold with a water cooling system and formed by stamping at high temperature. After forming, it is quickly cooled to below 100 °C by the mold, and the high-temperature austenite structure changes to martensite, so that the tensile strength of the part is increased to above 1300 MPa. Then, the hot formed part is grabbed from the mold by an automatic clamp. This process is the hot forming process.

[0003] At present, there are two positioning pins on the lower die cavity of the mold, namely the main positioning pin and the auxiliary positioning pin, corresponding to the main and auxiliary positioning holes on the steel plate. When the steel plate falls on the mold, the main and auxiliary positioning holes are respectively sleeved on the main and auxiliary positioning pins. The main and auxiliary positioning pins are ordinary positioning pins with only positioning functions. When the mold is pressed, there are avoidance holes at the positions of the upper die corresponding to the positioning pins to provide an avoidance space for the positioning pins during mold closing. However, during the production process, usually due to various accidents (such as the steel plate being placed unevenly, the part being stuck by the pin, and the part being pulled and broken by the pin due to thermal expansion and contraction), the positioning pin breaks. And because the operator does not find the fracture of the positioning pin in time, the broken positioning pin remains on the mold surface. When the mold is closed during continuous production, the high-hardness positioning pin will be pressed into the mold, which will damage the mold, making the mold unable to continue production and causing unnecessary mold repair costs. Therefore, it is necessary to design a positioning pin assembly capable of detecting the fracture of the positioning pin to improve the above problems. Content of the Utility Model

[0004] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a positioning pin assembly capable of detecting the fracture of the positioning pin, so that when the positioning pin breaks, an alarm signal is sent to the hot forming automatic control system. When the system receives the fracture signal, the equipment will be stopped urgently and a warning light will be sent to prompt the operator.

[0005] To achieve the above purpose, the utility model provides the following technical solutions:

[0006] A positioning pin assembly capable of detecting the fracture of a positioning pin, comprising a positioning pin body. A positioning pin body mounting seat is fixedly connected to the bottom of the positioning pin body. An installation hole is axially formed at the center of the positioning pin body. A straight steel wire is arranged in the installation hole. The bottom end of the installation hole penetrates through the positioning pin body mounting seat. The bottom end of the straight steel wire extends to the outside of the installation hole and is fixedly connected with a magnet. A steel wire limiting seat is installed at the bottom of the positioning pin body mounting seat. The steel wire limiting seat is sleeved on the outside of the straight steel wire. An upper contact is installed at the bottom of the steel wire limiting seat. A lower contact is installed at the top of the magnet. The lower contact corresponds to the position of the upper contact.

[0007] As a preferred solution of the present utility model, the top end of the installation hole extends to a position near the top of the positioning pin body, and the top end of the straight steel wire abuts against the inner top end of the installation hole.

[0008] As a preferred solution of the present utility model, a connection hole is formed at the position of the installation hole on the positioning pin body mounting seat. The diameter of the connection hole is larger than the diameter of the installation hole. The connection hole is coaxially arranged with the installation hole. A connection column is fixedly connected to the center of the top of the steel wire limiting seat. The connection column is threadedly connected in the connection hole. A through hole for the straight steel wire to pass through is formed at the center of the connection column and the steel wire limiting seat.

[0009] As a preferred solution of the present utility model, a steel wire limiting part is arranged at the position of the straight steel wire above the top of the connection column.

[0010] As a preferred solution of the present utility model, the steel wire limiting part is a protrusion formed by argon arc welding.

[0011] As a preferred solution of the present utility model, contact signal wires are connected to both the lower contact and the upper contact. Avoidance holes for the contact signal wires to pass through are formed on both the steel wire limiting seat and the magnet.

[0012] As a preferred solution of the present utility model, a guiding member is arranged between the magnet and the steel wire limiting seat.

[0013] As a preferred solution of the present utility model, the guiding member includes a fixed ring sleeve and a plurality of guiding pieces fixedly connected to the top of the fixed ring sleeve at equal intervals along the circumferential direction of the fixed ring sleeve. The fixed ring sleeve is fixedly installed on the magnet. Guiding grooves are formed on the outer wall of the steel wire limiting seat corresponding to the guiding pieces. One end of the guiding piece is placed in the guiding groove.

[0014] Compared with the prior art, the beneficial effects of the present utility model are:

[0015] Through the straight steel wire, steel wire limit seat, magnet, lower contact and upper contact provided by the utility model, when the positioning pin body breaks, the upper part of the straight steel wire loses restraint, and the magnet is adsorbed to the bottom of the steel wire limit seat under the action of magnetic force, so that the lower contact contacts the upper contact, and the electrical signal is connected. When the hot forming automation control system receives this electrical signal, it will stop the equipment emergently and emit a warning light to prompt the operator, enabling the timely discovery of the breakage of the positioning pin in the mold, avoiding problems such as product positioning failure and mold damage caused by the breakage of the positioning pin, avoiding the generation of waste products, and avoiding high mold repair costs. Description of the Drawings

[0016] Figure 1 It is a schematic perspective view of the overall structure of the positioning pin assembly capable of detecting the breakage of the positioning pin;

[0017] Figure 2 It is a schematic cross-sectional view of the positioning pin body;

[0018] Figure 3 It is a schematic perspective view of the cooperation between the steel wire limit seat and the magnet;

[0019] Figure 4 It is a schematic front view of the cooperation between the steel wire limit seat and the magnet.

[0020] In the figure: 1. Positioning pin body; 101. Mounting hole; 2. Positioning pin body mounting seat; 201. Connecting hole; 3. Steel wire limit seat; 301. Connecting column; 302. Guide groove; 4. Straight steel wire; 401. Steel wire limit part; 5. Magnet; 6. Lower contact; 7. Upper contact; 8. Guide part; 801. Fixed ring sleeve; 802. Guide piece; 9. Contact signal wire. Specific Embodiments

[0021] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0022] Embodiment:

[0023] Please refer to Figures 1-4, this embodiment provides a locating pin assembly capable of detecting the fracture of a locating pin, including a locating pin body 1. A locating pin body mounting seat 2 is fixedly connected to the bottom of the locating pin body 1. The locating pin body mounting seat 2 serves as the mounting part of the locating pin body 1 and is used to mount the locating pin body 1 on the lower mold surface. An installation hole 101 is axially formed at the center of the locating pin body 1. A straight steel wire 4 is arranged in the installation hole 101. Among them, the top end of the installation hole 101 extends to the vicinity of the top of the locating pin body 1, and the top end of the straight steel wire 4 abuts against the inner top end of the installation hole 101. The bottom end of the installation hole 101 penetrates through the locating pin body mounting seat 2, and the bottom end of the straight steel wire 4 extends outside the installation hole 101 and is fixedly connected to a magnet 5. A steel wire limiting seat 3 is installed at the bottom of the locating pin body mounting seat 2. The steel wire limiting seat 3 is made of a material that can adsorb to the magnet 5. The steel wire limiting seat 3 is sleeved outside the straight steel wire 4. An upper contact 7 is installed at the bottom of the steel wire limiting seat 3, and a lower contact 6 is installed at the top of the magnet 5. The lower contact 6 and the upper contact 7 are in corresponding positions. Contact signal lines 9 are connected to both the lower contact 6 and the upper contact 7. The lower contact 6 and the upper contact 7 are electrically connected to the hot forming automation control system through the contact signal lines 9.

[0024] Specifically, when the locating pin body 1 breaks, the upper part of the straight steel wire 4 loses restraint. At this time, the magnet 5 is attracted by the magnetic force and adsorbs to the bottom of the steel wire limiting seat 3, causing the lower contact 6 and the upper contact 7 to come into contact and connect the electrical signal. When the hot forming automation control system receives this electrical signal, it will cause the equipment to stop urgently and emit a warning light to prompt the operator, enabling the timely discovery of the fracture of the locating pin in the mold, avoiding problems such as product positioning failure and mold damage caused by the fracture of the locating pin, preventing the generation of waste products, and avoiding high mold repair costs.

[0025] In this embodiment, the diameter of the installation hole 101 is larger than the diameter of the straight steel wire 4. For example, the diameter of the installation hole 101 is 4 mm and the diameter of the straight steel wire 4 is 2 mm, to avoid affecting the movement of the straight steel wire 4 in the installation hole 101 when the locating pin body 1 breaks.

[0026] In this embodiment, as Figure 2 shown, a connection hole 201 is formed at the position of the installation hole 101 on the locating pin body mounting seat 2. The diameter of the connection hole 201 is larger than the diameter of the installation hole 101. The connection hole 201 and the installation hole 101 are coaxially arranged. A connection column 301 is fixedly connected to the center of the top of the steel wire limiting seat 3. The connection column 301 is threadedly connected to the connection hole 201. A through hole for the straight steel wire 4 to pass through is formed at the center of the connection column 301 and the steel wire limiting seat 3. The steel wire limiting seat 3 is installed in the connection hole 201 of the locating pin body mounting seat 2 through the connection column 301, facilitating the installation and fixation of the steel wire limiting seat 3.

[0027] In this embodiment, as Figure 3As shown, a wire limiting portion 401 is provided at the top of the connecting column 301 on the straight wire 4. The wire limiting portion 401 is a protrusion formed by argon arc welding. By providing the wire limiting portion 401, the straight wire 4 cannot pass through the through hole on the connecting column 301 and the wire limiting seat 3, so as to limit the position of the straight wire 4.

[0028] In this embodiment, as Figure 3 shown, avoidance holes for the contact signal wire 9 to pass through are provided on both the wire limiting seat 3 and the magnet 5. Among them, the outside of the contact signal wire 9 is wrapped with an insulating sheath.

[0029] In this embodiment, as Figure 3 and Figure 4 shown, a guiding member 8 is provided between the magnet 5 and the wire limiting seat 3. The guiding member 8 includes a fixed ring sleeve 801 and a plurality of guiding pieces 802 fixedly connected to the top of the fixed ring sleeve 801 at equal intervals along the circumferential direction of the fixed ring sleeve 801. The fixed ring sleeve 801 is fixedly installed on the magnet 5. A guiding groove 302 is provided on the outer wall of the wire limiting seat 3 corresponding to the guiding piece 802. One end of the guiding piece 802 is placed in the guiding groove 302. When the positioning pin body 1 breaks, the magnet 5 is adsorbed and moves onto the wire limiting seat 3. At this time, the guiding piece 802 moves in the guiding groove 302, playing a role in limiting and guiding the magnet 5, and avoiding the problem that the position of the magnet 5 shifts during the movement process, resulting in the misalignment of the lower contact 6 and the upper contact 7 and causing failure.

[0030] Working principle: During assembly, insert the straight wire 4 into the installation hole 101 of the positioning pin body 1, then sleeved the wire limiting seat 3 outside the straight wire 4 through the through hole, and connect the wire limiting seat 3 to the connecting hole 201 of the positioning pin body mounting seat 2 through the connecting column 301 to install and fix the wire limiting seat 3 and the positioning pin body mounting seat 2. Then fixedly connect the magnet 5 to the bottom of the straight wire 4. When the positioning pin body 1 breaks, the upper part of the straight wire 4 loses restraint. At this time, the magnet 5 is attracted by the magnetic force and adsorbs to the bottom of the wire limiting seat 3. During the movement of the magnet 5, the guiding piece 802 moves in the guiding groove 302, playing a role in limiting and guiding the magnet 5, ensuring the moving position of the magnet 5, so that the lower contact 6 and the upper contact 7 come into contact to connect the electrical signal. The hot forming automation control system receives this electrical signal, which will cause the equipment to stop urgently and emit a warning light to prompt the operator, enabling timely discovery of the fracture of the positioning pin in the mold, avoiding problems such as product positioning failure and mold damage caused by the fracture of the positioning pin, avoiding the generation of waste products, and avoiding high mold repair costs.

[0031] The above embodiment is a preferred implementation scheme of the present invention. In addition, the present invention can also be implemented in other ways. Any obvious replacement without departing from the concept of the technical solution is within the protection scope of the present invention.

Claims

1. A locating pin assembly capable of detecting the fracture of a locating pin, comprising a locating pin body (1), and a locating pin body mounting seat (2) is fixedly connected to the bottom of the locating pin body (1), characterized in that: At the center of the positioning pin body (1), an installation hole (101) is axially formed. A straight steel wire (4) is arranged in the installation hole (101). The bottom end of the installation hole (101) penetrates through the positioning pin body mounting seat (2). The bottom end of the straight steel wire (4) extends to the outside of the installation hole (101) and is fixedly connected with a magnet (5). A steel wire limiting seat (3) is installed at the bottom of the positioning pin body mounting seat (2). The steel wire limiting seat (3) is sleeved on the outside of the straight steel wire (4). An upper contact (7) is installed at the bottom of the steel wire limiting seat (3). A lower contact (6) is installed at the top of the magnet (5). The lower contact (6) corresponds to the position of the upper contact (7).

2. The locating pin assembly capable of detecting the fracture of the locating pin according to claim 1, wherein: The top end of the installation hole (101) extends to a position near the top of the positioning pin body (1). The top end of the straight steel wire (4) abuts against the inner top end of the installation hole (101).

3. The positioning pin assembly capable of detecting the fracture of the positioning pin according to claim 1, characterized in that: A connection hole (201) is formed in the positioning pin body mounting seat (2) at the position of the installation hole (101). The diameter of the connection hole (201) is larger than the diameter of the installation hole (101). The connection hole (201) is coaxially arranged with the installation hole (101). A connection column (301) is fixedly connected to the center of the top of the steel wire limiting seat (3). The connection column (301) is threadedly connected in the connection hole (201). A through hole for the straight steel wire (4) to pass through is formed at the center of the connection column (301) and the steel wire limiting seat (3).

4. The positioning pin assembly capable of detecting the fracture of the positioning pin according to claim 3, wherein: A steel wire limiting part (401) is arranged on the straight steel wire (4) at the top of the connection column (301).

5. A locating pin assembly capable of detecting the fracture of a locating pin according to claim 4, characterized in that: The steel wire limiting part (401) is a bulge formed by argon arc welding.

6. The positioning pin assembly capable of detecting the fracture of the positioning pin according to claim 1, wherein: Contact signal lines (9) are connected to both the lower contact (6) and the upper contact (7). Avoidance holes for the contact signal lines (9) to pass through are formed in both the steel wire limiting seat (3) and the magnet (5).

7. A locating pin assembly capable of detecting the fracture of a locating pin according to claim 1, characterized in that: A guiding part (8) is arranged between the magnet (5) and the steel wire limiting seat (3).

8. A positioning pin assembly capable of detecting the fracture of a positioning pin according to claim 7, characterized in that: The guiding part (8) includes a fixed ring sleeve (801) and a plurality of guiding pieces (802) fixedly connected to the top of the fixed ring sleeve (801) at equal intervals along the circumferential direction of the fixed ring sleeve (801). The fixed ring sleeve (801) is fixedly installed on the magnet (5). Guiding grooves (302) are formed in the outer wall of the steel wire limiting seat (3) corresponding to the guiding pieces (802). One end of the guiding piece (802) is placed in the guiding groove (302).

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