Automatic die for in-die chamfering roll pin

Abstract

The invention relates to the technical field of roll pin machining dies, and discloses an in-die chamfering roll pin automatic die which comprises an automatic die body, an upper punch, a lower punch, an elastic loading part, a driving part and a chip drawing ventilation part. A chamfering station is arranged on the automatic die body, the lower punch is installed in a chamfering station area, an upper punch located above the lower punch is installed in the chamfering station area through an elastic loading part, conical chamfering openings are formed in the adjacent ends of the upper punch and the lower punch, and the elastic loading part is driven by a driving part to drive the upper punch to move up and down. A chip removal channel is formed in the lower punch, and the chip suction ventilation piece is used for conducting chip suction and air supply actions on the chip removal channel in the lower punch. Automatic pre-positioning of the roll pin part before stamping is achieved through negative pressure adsorption, chamfering forming is directly completed in the stamping stage, the process complexity is reduced, blowing ejection and cooling are achieved through valve switching and reverse work of the chip pump, the problem that the workpiece adheres to a die is solved, and high-temperature deformation of the chamfering part is prevented.

Description

Technical Field

[0001] This invention relates to the field of coiled pin processing mold technology, and in particular to an automatic mold for in-mold chamfering of coiled pins. Background Technology

[0002] Coiled flexible cylindrical pins (referred to as coiled pins) are a type of mechanical fastener with a spiral coiled structure. Due to their good elasticity and strength, they are widely used in the industrial field. Their main uses include connection and positioning, power transmission, buffering and shock absorption, and overload protection. In the processing of coiled pins, it is usually necessary to use a processing die to stamp the blank. Specifically, after the blank is fed into the processing die, the die parts on the die complete the cutting and rolling action, and then the material is discharged.

[0003] However, traditional coil processing dies cannot directly achieve chamfering during the stamping stage. After the coil is produced, it needs to be transferred to the next process and chamfered by a special machine. This two-step operation not only increases the complexity of the process but also reduces processing efficiency and affects the overall production efficiency.

[0004] To address the aforementioned issues, this application proposes an automatic die for in-mold chamfering and coiling pins. Summary of the Invention

[0005] This invention proposes an automatic die for in-mold chamfering of coiled pins, which solves the problem in related technologies that traditional coiled pin processing dies cannot directly chamfer during stamping and need to be transferred to the next process for machine processing, which increases complexity and affects overall production efficiency due to two-step operation.

[0006] The present invention proposes an automatic die for in-mold chamfering and coiling pins, comprising an automatic die body, an upper punch, a lower punch, an elastic loading component, a driving component, and a chip extraction and ventilation component;

[0007] The automatic mold body is provided with a chamfering station. The lower punch is installed in the chamfering station area. The chamfering station area is equipped with an upper punch located above the lower punch through an elastic loading member. The upper punch and the lower punch are both formed with a tapered chamfer at their adjacent ends. The elastic loading member is driven by a driving member to move the upper punch up and down.

[0008] The lower punch has a chip removal channel, and the chip extraction and ventilation component is used to extract chips and supply air to the chip removal channel in the lower punch.

[0009] When the coiled pin is placed between the upper and lower punches, the chip extraction and ventilation unit draws air from the chip removal channel in the lower punch to create a negative pressure, which pre-positions the coiled pin. The drive unit then drives the elastic loading unit to move the upper punch downward, causing both ends of the coiled pin to be stamped at the conical chamfered openings of the upper and lower punches, forming a conical chamfer. Waste chips are then extracted through the chip extraction and ventilation unit.

[0010] As a further optimization of the present invention, the elastic loading member includes an elastic part and a rack. The elastic part is installed in the upper region of the chamfering station, the rack is installed at the bottom end of the elastic part and is driven to move up and down by a driving member, and the upper punch is installed on the rack.

[0011] As a further optimization of the present invention, the elastic part includes a shaft tube, a spring and a connecting rod. The shaft tube is vertically installed in the area above the chamfering station. An insertion cavity is opened in the shaft tube. The spring is installed in the insertion cavity. A connecting rod inserted into the insertion cavity and connected to the spring is inserted into the bottom end of the shaft tube. The rack is installed at the bottom end of the connecting rod.

[0012] As a further optimization of the present invention, the driving component includes a motor and a gear. The motor is installed in the chamfering station area, and the driving end of the motor is connected to a gear that meshes with a rack.

[0013] As a further optimization of the present invention, the chip extraction ventilation component includes a chip extraction ventilation section, a chip extraction pipe, and an air guide pipe. The bottom of the lower punch is connected to a hollow shaft that communicates with the chip discharge channel. The bottom end of the hollow shaft is connected to the chip extraction pipe, and a third valve is installed on the chip extraction pipe. The side of the hollow shaft is connected to the air guide pipe, and a fourth valve is installed on the air guide pipe. Both the chip extraction pipe and the air guide pipe are connected to the chip extraction ventilation section.

[0014] As a further optimization of the present invention, the chip extraction and ventilation section includes a chip extraction pump, a diversion pipe and a ventilation pipe. The chip extraction pump is installed on the automatic mold body. The two ends of the chip extraction pump are respectively connected to the diversion pipe and the ventilation pipe. The ends of the chip extraction pipe and the air guide pipe away from the hollow shaft are both connected to the diversion pipe. The end of the ventilation pipe is connected to the chip discharge pipe and the air inlet pipe.

[0015] As a further optimization of the present invention, a first valve is installed on the chip removal pipe and a second valve is installed on the air intake pipe.

[0016] The above-described technical solution of the present invention has the following beneficial technical effects:

[0017] 1. The blank is fed into the automatic mold body. After being cut and rolled, the rolled part is placed between the upper punch and the lower punch. At this time, the chip pump of the chip extraction and ventilation section is started, the third valve and the first valve are opened, and the fourth valve and the second valve are closed. The flow pipe, chip extraction pipe and chip discharge channel of the lower punch generate suction to form a negative pressure, so that the rolled part is pre-positioned. The drive component drives the elastic loading component to move the upper punch down. The rolled part is punched at the conical chamfering opening to form a chamfer. The waste chips enter the chip extraction pump through the chip extraction pipe and the flow pipe, and are discharged and collected through the ventilation pipe and the chip discharge pipe. The above design realizes that the rolled pin is directly chamfered during the stamping stage without the need to transfer to the next process for special chamfering processing, which reduces the complexity of the process. Furthermore, the negative pressure adsorption is used to realize the automatic pre-positioning of the rolled pin, ensuring its accurate position before stamping. At the same time, the waste chips generated by chamfering and stamping are sucked away and collected in real time through the chip discharge channel, reducing equipment failure and downtime cleaning time caused by waste chip problems.

[0018] 2. After the pin is chamfered, the drive unit drives the elastic loading unit to move the upper punch upward. If the pin is stuck on the lower punch, the fourth valve on the air guide pipe and the second valve on the air inlet pipe can be opened, and the third valve on the chip extraction pipe and the first valve on the chip discharge pipe can be closed. Then, the chip extraction pump is reversed, and external air enters the chip extraction pump through the air inlet pipe and the split pipe. Then, it is delivered to the chip discharge channel in the lower punch through the split pipe and the air guide pipe, which can eject the pin and blow air into the chip discharge channel to cool the conical chamfered opening at the adjacent end of the upper and lower punches. The above design can achieve the functions of blowing air to eject and cooling by switching valves. After chamfering, it can effectively solve the problem of workpiece sticking to the mold and achieve rapid demolding. At the same time, the airflow is used to cool the working area of ​​the lower punch to prevent the chamfered part from deforming due to high temperature and affecting the machining accuracy. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of an automatic mold for in-mold chamfering and coiling pins proposed in this invention;

[0020] Figure 2 This is a schematic diagram of the cooperative structure of the upper punch, lower punch, elastic loading component, driving component and chip extraction ventilation component of the present invention;

[0021] Figure 3 This is a schematic diagram of the mating structure between the lower punch and the chip extraction and ventilation component of the present invention;

[0022] Figure 4 This is a schematic diagram of the structure of the chip extraction and ventilation component of the present invention.

[0023] Reference numerals: 1. Automatic mold body; 2. Upper punch; 3. Lower punch; 31. Chip removal channel; 32. Hollow shaft; 4. Elastic loading component; 41. Elastic part; 411. Shaft tube; 412. Spring; 413. Connecting rod; 42. Rack; 5. Driving component; 51. Motor; 52. Gear; 6. Chip extraction and ventilation component; 61. Chip extraction and ventilation section; 611. Chip extraction pump; 612. Diverter pipe; 613. Ventilation pipe; 614. Chip removal pipe; 6141. First valve; 615. Air inlet pipe; 6151. Second valve; 62. Chip extraction pipe; 621. Third valve; 63. Air guide pipe; 631. Fourth valve. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and the accompanying drawings. It should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and techniques are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0025] like Figure 1-4 As shown, the present invention proposes an automatic die for in-mold chamfering and coiling, comprising an automatic die body 1, an upper punch 2, a lower punch 3, an elastic loading component 4, a driving component 5, and a chip extraction and ventilation component 6.

[0026] The automatic mold body 1 is provided with a chamfering station. The lower punch 3 is installed in the chamfering station area. The chamfering station area is equipped with an upper punch 2 located above the lower punch 3 through an elastic loading member 4. The upper punch 2 and the lower punch 3 are both formed with a tapered chamfer at their adjacent ends. The elastic loading member 4 is driven by the driving member 5 to move the upper punch 2 up and down.

[0027] A chip removal channel 31 is provided inside the lower punch 3, and the chip removal and air supply component 6 is used to perform chip removal and air supply operations on the chip removal channel 31 inside the lower punch 3.

[0028] When the coiled pin is placed between the upper punch 2 and the lower punch 3, the chip extraction and ventilation component 6 extracts air from the chip discharge channel 31 in the lower punch 3 to create a negative pressure, which pre-positions the coiled pin. The driving component 5 drives the elastic loading component 4 to move the upper punch 2 downward, so that both ends of the coiled pin are punched at the conical chamfered openings of the upper punch 2 and the lower punch 3 to form a conical chamfer. Waste chips are extracted through the chip extraction and ventilation component 6.

[0029] During operation, the coiled pin is placed between the upper punch 2 and the lower punch 3. The chip extraction and ventilation component 6 first evacuates the chip removal channel 31, creating a negative pressure environment within the channel. The pressure difference then attracts the coiled pin onto the lower punch 3, achieving pre-positioning and preventing displacement of the coiled pin during subsequent stamping, which could lead to deviations in the chamfer dimensions. Subsequently, the drive component 5 drives the elastic loading component 4 to move the upper punch 2 downwards. The tapered chamfering openings of the upper punch 2 and lower punch 3 apply stamping force to both ends of the coiled pin, causing plastic deformation at both ends under pressure to form the required tapered chamfer. This chamfering process can be completed without additional steps, simplifying the manufacturing process. Simultaneously, the waste chips generated during stamping are drawn away by the negative pressure suction... The chip removal channel 31 is quickly extracted by the chip extraction and ventilation component 6 to prevent waste chips from accumulating at the chamfering edge. After the chamfering is completed, the drive component 5 drives the elastic loading component 4 to move the upper punch 2 upward. Then, the chip extraction and ventilation component 6 works in the opposite direction, blowing air into the chip removal channel 31 in the lower punch 3. This can eject the coiled pin and cool the conical chamfering edge at the adjacent ends of the upper punch 2 and the lower punch 3 by blowing air into the chip removal channel 31. The above design can achieve the functions of blowing air and cooling by switching valves. After the chamfering is completed, it can effectively solve the problem of workpiece sticking to the mold and achieve rapid demolding. At the same time, the airflow is used to cool the working area of ​​the upper punch 2 and the lower punch 3 to prevent the chamfered part from deforming due to high temperature and affecting the processing accuracy.

[0030] In this embodiment, the elastic loading member 4 includes an elastic part 41 and a rack 42. The elastic part 41 is installed in the upper region of the chamfering station, and the rack 42 is installed at the bottom end of the elastic part 41 and is driven up and down by the driving member 5. The upper punch 2 is installed on the rack 42. During operation, the driving member 5 drives the rack 42 to move the upper punch 2 downward. At this time, the elastic part 41 is stretched. After the chamfering is completed, the driving member 5 reverses its action, pushing the rack 42 to move the upper punch 2 back to its original position. The elastic part 41 can speed up the reset speed to prepare for the next processing.

[0031] In this embodiment, the elastic part 41 includes a shaft tube 411, a spring 412, and a connecting rod 413. The shaft tube 411 is vertically installed in the area above the chamfering station. An insertion cavity is opened in the shaft tube 411, and the spring 412 is installed in the insertion cavity. The bottom end of the shaft tube 411 is inserted into the insertion cavity and connected to the spring 412. The rack 42 is installed at the bottom end of the connecting rod 413. When the rack 42 moves up and down under the action of the driving member 5, the connecting rod 413 moves up and down in the shaft tube 411, and the spring 412 is compressed or stretched, which plays a role in buffering and elastic reset, making the punching action of the upper punch 2 more gentle and avoiding damage to the coiled pin by hard impact.

[0032] In this embodiment, the driving component 5 includes a motor 51 and a gear 52. The motor 51 is installed in the chamfering station area, and the driving end of the motor 51 is connected to the gear 52 that meshes with the rack 42. During operation, the motor 51 drives the gear 52 to push the rack 42 to move up and down, thereby driving the upper punch 2 to move up and down to achieve the stamping action.

[0033] In this embodiment, the chip extraction ventilation component 6 includes a chip extraction ventilation section 61, a chip extraction pipe 62, and an air guide pipe 63. The bottom of the lower punch 3 is connected to a hollow shaft 32 that communicates with the chip discharge channel 31. The bottom end of the hollow shaft 32 is connected to the chip extraction pipe 62, and a third valve 621 is installed on the chip extraction pipe 62. The side of the hollow shaft 32 is connected to the air guide pipe 63, and a fourth valve 631 is installed on the air guide pipe 63. Both the chip extraction pipe 62 and the air guide pipe 63 are connected to the chip extraction ventilation section 61.

[0034] The chip extraction and ventilation section 61 includes a chip extraction pump 611, a diversion pipe 612, and a ventilation pipe 613. The chip extraction pump 611 is mounted on the automatic mold body 1. The two ends of the chip extraction pump 611 are connected to the diversion pipe 612 and the ventilation pipe 613, respectively. The ends of the chip extraction pipe 62 and the air guide pipe 63 away from the hollow shaft 32 are both connected to the diversion pipe 612. The end of the ventilation pipe 613 is connected to the chip discharge pipe 614 and the air inlet pipe 615. A first valve 6141 is installed on the chip discharge pipe 614, and a second valve 6151 is installed on the air inlet pipe 615.

[0035] During operation, in the chamfering and punching stage, the chip extraction pump 611 starts, the third valve 621 on the chip extraction pipe 62 and the first valve 6141 on the chip discharge pipe 614 open, and the fourth valve 631 on the air guide pipe 63 and the second valve 6151 on the air inlet pipe 615 close. Suction is generated in the split pipe 612, the chip extraction pipe 62, and the chip discharge channel 31 in the lower punch 3, creating a negative pressure within the chip discharge channel 31. Under this negative pressure, the coiled pin can play a role in pre-forming... The positioning function is then used to drive the elastic loading member 4 through the driving member 5 to move the upper punch 2 downward, so that the two ends of the coiled pin are punched at the conical chamfer positions of the upper punch 2 and the lower punch 3 to form a conical chamfer. The waste chips from the bottom chamfer of the coiled pin can enter the chip pump 611 through the chip extraction pipe 62 and the diversion pipe 612, and then be discharged through the ventilation pipe 613 and the chip discharge pipe 614 to achieve real-time cleaning of waste chips and avoid the accumulation of waste chips in the chamfer area, which would affect the machining accuracy.

[0036] After the chamfering is completed, if the coiled part sticks to the mold, the drive component 5 drives the elastic loading component 4 to move the upper punch 2 upward. This opens the fourth valve 631 on the air guide pipe 63 and the second valve 6151 on the air inlet pipe 615, and closes the third valve 621 on the chip extraction pipe 62 and the first valve 6141 on the chip discharge pipe 614. Then, the chip extraction pump 611 works in reverse. External air enters the chip extraction pump 611 through the air inlet pipe 615 and the diversion pipe 612, and is then transported to the chip discharge channel 31 in the lower punch 3 through the diversion pipe 612 and the air guide pipe 63. This ejects the coiled part, achieving rapid demolding. Furthermore, blowing air into the chip discharge channel 31 cools the conical chamfered openings at the adjacent ends of the upper punch 2 and the lower punch 3, preventing deformation of the conical chamfered openings of the lower punch 3 due to high temperatures and extending its service life.

[0037] The specific working principle of this invention is as follows:

[0038] The coiled pin blank is fed into the automatic mold body 1. The blank is first cut and rolled into a circle by the preset processing structure inside the mold to form a coiled pin part to be chamfered.

[0039] The coiled pin is placed on the upper end face of the lower punch 3, in the area where the conical chamfered opening is aligned between the upper punch 2 and the lower punch 3. Then, the chip extraction pump 611 is started and operates in the forward direction. At the same time, the third valve 621 and the first valve 6141 are opened, and the second valve 6151 and the fourth valve 631 are closed. The negative pressure suction generated by the chip extraction pump 611 is transmitted to the chip extraction pipe 62 through the vent pipe 613 and the diverter pipe 612, and then enters the chip discharge channel 31 in the lower punch 3 through the hollow shaft 32, so that a negative pressure environment is formed in the chip discharge channel 31, which plays a role in pre-positioning the coiled pin and avoids problems such as chamfer offset and inconsistent dimensions during subsequent stamping.

[0040] After pre-positioning, when the motor 51 drives the gear 52 to move the rack 42 downward, it causes the connecting rod 413 connected to it to slide downward along the insertion cavity of the shaft tube 411, stretching the spring 412 inside the shaft tube 411. At the same time, the upper punch 2 installed at the bottom of the rack 42 moves downward synchronously with the rack 42. When the tapered chamfered opening of the upper punch 2 contacts the upper end face of the pin, it continues to apply a downward punching force, cooperating with the tapered chamfered opening of the lower punch 3 to simultaneously punch both ends of the pin. The two ends of the pin are punched in both directions. Under the action of stamping pressure, plastic deformation occurs, gradually conforming to the contour of the conical chamfer, and finally forming a conical chamfer that meets the design requirements. During this process, the waste chips generated by stamping are continuously sucked into the chip removal channel 31 under the negative pressure suction. They then pass through the hollow shaft 32, chip extraction pipe 62, diversion pipe 612, chip extraction pump 611, ventilation pipe 613 and chip removal pipe 614 in sequence, and are finally discharged to the external collection system, realizing real-time cleaning of waste chips and avoiding the accumulation of waste chips at the chamfer and affecting the machining accuracy.

[0041] After the chamfering stamping is completed, the motor 51 drives the gear 52 to move the rack 42 upward, pushing the connecting rod 413 to reset upward along the insertion cavity of the shaft tube 411. The upper punch 2 moves upward synchronously, returning to its initial high position, reserving space for the next processing. If the coiled part is stuck to the upper end face of the lower punch 3 due to stamping pressure or material adhesion and cannot be detached by itself, the third valve 621 and the first valve 6141 are closed, and the second valve 6151 and the fourth valve 631 are opened. At the same time, the chip extraction pump 611 is controlled to work in reverse, switching to air supply mode. Air enters the chip pump 611 through the air inlet pipe 615, is transferred to the air guide pipe 63 through the air pipe 613 and the split pipe 612, and then enters the chip removal channel 31 through the hollow shaft 32. It is then sprayed upward from the upper opening of the chip removal channel 31. The upward thrust generated by the airflow pushes out the stuck coiled pin, realizing automatic demolding. At the same time, the airflow flows through the tapered chamfered opening of the lower punch 3 and the lower end face of the upper punch 2, which can quickly remove the heat generated during the stamping process, cool the chamfered area of ​​the mold, and prevent the tapered chamfered opening from deforming due to high temperature.

[0042] The embodiments of the present invention have been described above, but the embodiments are not limited to the specific implementation methods described above. The specific implementation methods described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the embodiments described above, all of which are within the protection scope of the embodiments described above.

Claims

1. An automatic die for in-mold chamfering coiled pins, characterized in that, It includes an automatic mold body (1), an upper punch (2), a lower punch (3), an elastic loading component (4), a driving component (5), and a chip extraction and ventilation component (6); The automatic mold body (1) is provided with a chamfering station. The lower punch (3) is installed in the chamfering station area. The chamfering station area is equipped with an upper punch (2) located above the lower punch (3) through an elastic loading member (4). The upper punch (2) and the lower punch (3) are both formed with a tapered chamfer at their adjacent ends. The elastic loading member (4) is driven by the driving member (5) to move the upper punch (2) up and down. The lower punch (3) has a chip removal channel (31) inside, and the chip removal and ventilation component (6) is used to perform chip removal and air supply operations on the chip removal channel (31) inside the lower punch (3). When the coiled pin is placed between the upper punch (2) and the lower punch (3), the chip extraction vent (6) extracts air from the chip discharge channel (31) in the lower punch (3) to form a negative pressure, which prepositions the coiled pin. The drive (5) drives the elastic loading component (4) to move the upper punch (2) down, so that the two ends of the coiled pin are punched at the conical chamfered openings of the upper punch (2) and the lower punch (3) to form a conical chamfer. The waste chips are extracted through the chip extraction vent (6).

2. The automatic die for in-mold chamfering and coiling pins according to claim 1, characterized in that, The elastic loading member (4) includes an elastic part (41) and a rack (42). The elastic part (41) is installed in the upper area of ​​the chamfering station. The rack (42) is installed at the bottom end of the elastic part (41) and is driven up and down by the driving member (5). The upper punch (2) is installed on the rack (42).

3. The automatic die for in-mold chamfering and coiling pins according to claim 2, characterized in that, The elastic part (41) includes a shaft tube (411), a spring (412) and a connecting rod (413). The shaft tube (411) is vertically installed in the area above the chamfering station. An insertion cavity is opened in the shaft tube (411). The spring (412) is installed in the insertion cavity. The bottom end of the shaft tube (411) is inserted into the insertion cavity and connected to the spring (412). The rack (42) is installed at the bottom end of the connecting rod (413).

4. The automatic die for in-mold chamfering and coiling pins according to claim 3, characterized in that, The drive unit (5) includes a motor (51) and a gear (52). The motor (51) is installed in the chamfering station area, and the drive end of the motor (51) is connected to the gear (52) that meshes with the rack (42).

5. An automatic die for in-mold chamfering and coiling pins according to claim 1, characterized in that, The chip extraction ventilation component (6) includes a chip extraction ventilation section (61), a chip extraction pipe (62), and an air guide pipe (63). The bottom of the lower punch (3) is connected to a hollow shaft (32) that communicates with the chip discharge channel (31). The bottom end of the hollow shaft (32) is connected to the chip extraction pipe (62), and a third valve (621) is installed on the chip extraction pipe (62). The side of the hollow shaft (32) is connected to the air guide pipe (63), and a fourth valve (631) is installed on the air guide pipe (63). Both the chip extraction pipe (62) and the air guide pipe (63) are connected to the chip extraction ventilation section (61).

6. An automatic die for in-mold chamfering and coiling pins according to claim 5, characterized in that, The chip extraction and ventilation section (61) includes a chip extraction pump (611), a diversion pipe (612), and a ventilation pipe (613). The chip extraction pump (611) is installed on the automatic mold body (1). The two ends of the chip extraction pump (611) are respectively connected to the diversion pipe (612) and the ventilation pipe (613). The ends of the chip extraction pipe (62) and the air guide pipe (63) away from the hollow shaft (32) are both connected to the diversion pipe (612). The end of the ventilation pipe (613) is connected to the chip discharge pipe (614) and the air inlet pipe (615).

7. An automatic die for in-mold chamfering and coiling pins according to claim 6, characterized in that, A first valve (6141) is installed on the chip removal pipe (614), and a second valve (6151) is installed on the air intake pipe (615).

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