A core pulling mechanism for forming an automobile headrest insertion tube and an application method thereof

Abstract

The application relates to a core-pulling mechanism for forming a pipe of a car headrest and an application method, which comprises an upper die and a lower die, the lower die is provided with a core-pulling slider seat and an elastic reset piece for resetting the core-pulling slider seat; one side of the core-pulling slider seat is provided with a first driving slope, and the other side is provided with a core-pulling rod; the core-pulling rod comprises a square positioning cylinder, the positioning cylinder is transversely fixed and penetrates through the core-pulling slider seat; four corners of the positioning cylinder are slidably provided with long-strip-shaped forming strips with L-shaped sections; the front end of a driving rod is in the shape of a circular truncated cone, the tail end is provided with a second driving slope and a second longitudinal surface for position keeping; the driving rod is located between the four forming strips; the core-pulling mechanism can adjust the outer diameter size of the core-pulling rod in a one-time mold opening and closing process, the size can reach the required size in the mold closing stage, and the size can be reduced in the mold opening stage, so that the core-pulling problem is fundamentally solved.

Description

Technical Field

[0001] This invention relates to the field of automotive hardware mold technology, and more specifically, to a core-pulling mechanism and application method for forming automotive headrest inserts. Background Technology

[0002] The inserts on car headrests are used to mate with the holes on the upper part of the car seat. Currently, the processing of square car headrest inserts typically involves three bending processes using a mold. During forming, a core-pulling mechanism is needed to insert into the internal cavity of the square insert to provide support. However, during core pulling, the clamping force from the bending process may hold the internal core-pulling rod, preventing it from detaching from the product when the mold is opened. Existing solutions mostly focus on improving the fitting precision of the core-pulling rod and reducing friction, which are difficult to design and do not fundamentally solve the problem. A core-pulling mechanism and application method for forming car headrest inserts that can better solve this problem without adding an extra mold-opening process is needed. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a core-pulling mechanism for forming automotive headrest tubes, and to provide a method for applying the core-pulling mechanism for forming automotive headrest tubes, in view of the above-mentioned defects of the prior art.

[0004] The technical solution adopted by this invention to solve its technical problem is:

[0005] A core-pulling mechanism for forming automotive headrest inserts is constructed, comprising an upper mold and a lower mold. The lower mold is provided with a core-pulling slider seat and an elastic reset member for resetting the core-pulling slider seat. One side of the core-pulling slider seat is provided with a first driving inclined surface and a first longitudinal surface for position holding, and the other side is provided with one or more core-pulling rods. Each core-pulling rod includes a square positioning cylinder, which is laterally fixed and passes through the core-pulling slider seat. At each of the four corners of the positioning cylinder, a long strip with an L-shaped cross-section is slidably arranged. The sliding square of the forming strip is along the angle bisector of its L-shape. The long strip slides along the length of the rectangular cross-section inside the positioning cylinder. The mold is equipped with a drive rod, and a return spring is provided inside the positioning cylinder to reset the drive rod. The front end of the drive rod is frustum-shaped, and the rear end is provided with a second drive slope and a second longitudinal surface for position holding. The drive rod is located between the four forming strips, and when the drive rod slides away from the core-pulling sliding seat, it will simultaneously squeeze the four forming strips, causing the four forming strips to fit against the corresponding inner angles of the positioning cylinder. The upper mold is provided with a first side blade corresponding to the first drive slope and a second side blade corresponding to the second drive slope. When the mold is closed, the first side blade will preferentially contact the first drive slope.

[0006] The present invention discloses a core-pulling mechanism for forming automotive headrest inserts, wherein a plurality of sliding rods are provided at the corners of the outer surface of the forming strip, distributed along the bisector of the angle; a sliding bearing that cooperates with the sliding rods is provided at the corners of the inner wall of the positioning cylinder, and the sliding bearing passes through the positioning cylinder; a positioning protrusion is provided at each corner of the outer surface of the positioning cylinder, the sliding bearing is fixed on the positioning protrusion, and a slot is provided on the positioning protrusion to avoid the sliding rod, and a spring piece that provides elastic force to the sliding rod is provided in the slot.

[0007] The core-pulling mechanism for forming automotive headrest inserts according to the present invention includes a transverse through hole for mounting the positioning cylinder on the core-pulling slider seat, and four positioning grooves that cooperate with the positioning protrusions on the inner wall of the through hole.

[0008] The core-pulling mechanism for forming automotive headrest inserts according to the present invention includes a threaded hole communicating with the through hole and a tightening screw cooperating with the threaded hole on the outer surface of the core-pulling sliding seat.

[0009] The core-pulling mechanism for molding automotive headrest tubes according to the present invention includes a second side blade disposed on the outer surface of the first side blade facing the core-pulling sliding seat, wherein the lowermost end of the lower surface of the first side blade is higher than the uppermost end of the lower surface of the second side blade; in the mold-open state, the first driving inclined surface and the second driving inclined surface are on the same plane.

[0010] The core-pulling mechanism for forming automotive headrest inserts according to the present invention includes an elastic reset member comprising a mounting base and two nitrogen springs. One end of each nitrogen spring is connected to the mounting base, and the other end is connected to the core-pulling sliding base. The mounting base is fixedly connected to the lower mold. The two nitrogen springs are arranged side by side with a gap in between to avoid the first side blade.

[0011] The present invention discloses a core-pulling mechanism for forming automotive headrest inserts, wherein a sliding seat is provided inside the positioning cylinder and slidably connected to the drive rod, and a return spring is sleeved on the drive rod, one end of the return spring being fixedly connected to the drive rod and the other end being fixedly connected to the positioning cylinder.

[0012] A method for applying a core-pulling mechanism for forming automotive headrest tubes, as described above, wherein the method includes the following steps:

[0013] When the mold is closed, the first side blade contacts the first driving inclined surface first, causing the core-pulling sliding seat to move. When the four forming strips reach the bending position, the core-pulling sliding seat reaches the maximum travel position.

[0014] Then the upper die continues to descend, the first side cutter contacts the first longitudinal surface to maintain the position of the core-pulling sliding seat, the second side cutter contacts the second driving inclined surface, causing the driving rod to move and spread the four forming strips. After being spread into place, the four forming strips combine to form the bending shape required for bending the workpiece. Then the second side cutter contacts the second longitudinal surface to maintain the position of the driving rod.

[0015] After bending is completed, the upper die moves upward to open, the second side cutter and the first side cutter move upward, and the drive rod and the core-pulling sliding seat are reset in sequence under the action of the reset spring and the elastic reset component.

[0016] The beneficial effects of this invention are as follows: During mold closing, the first side blade preferentially contacts the first driving inclined surface, causing the core-pulling sliding seat to move. When the four forming strips reach the bending position, the core-pulling sliding seat reaches the maximum travel position. Then, the upper mold continues to descend, the first side blade contacts the first longitudinal surface to maintain the position of the core-pulling sliding seat, and the second side blade contacts the second driving inclined surface, causing the driving rod to move and spread the four forming strips apart. After being spread into place, the four forming strips combine to form the bending shape required for bending the workpiece. Then, the second side blade contacts the second longitudinal surface to maintain the position of the driving rod. After bending is completed, the upper mold moves upward to open the mold, the second side blade and the first side blade move upward, and the driving rod and the core-pulling sliding seat are reset in sequence under the action of the return spring and the elastic return member. By applying the core-pulling mechanism of this application, the outer diameter of the core-pulling rod can be adjusted during one mold opening and closing process, so that it reaches the required size during the mold closing stage and shrinks its size during the mold opening stage, thereby fundamentally solving the core-pulling problem. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. The drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort:

[0018] Figure 1 This is a schematic diagram of the core-pulling mechanism for forming automotive headrest inserts according to a preferred embodiment of the present invention;

[0019] Figure 2 This is a cross-sectional view of the core-pulling rod of the core-pulling mechanism for forming automotive headrest inserts according to a preferred embodiment of the present invention. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, a clear and complete description will be provided below in conjunction with the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the protection scope of the present invention.

[0021] A preferred embodiment of the present invention provides a core-pulling mechanism for molding automotive headrest inserts, such as... Figure 1 As shown, see also Figure 2 The system includes an upper mold and a lower mold. The lower mold is provided with a core-pulling slider seat 1 and an elastic reset member 2 for resetting the core-pulling slider seat 1. One side of the core-pulling slider seat 1 is provided with a first driving inclined surface 10 and a first longitudinal surface 11 for position holding, and the other side is provided with one or more core-pulling rods 3. The core-pulling rod 3 includes a square positioning cylinder 30, which is laterally fixed and passes through the core-pulling slider seat 1. At each of the four corners of the positioning cylinder 30, there is a sliding strip 31 with an L-shaped cross-section. The sliding square of the forming strip 31 is along the angle bisector of its L-shape. A driving rod 32 is slidably arranged along the length of the rectangular section inside the positioning cylinder 30 for positioning. The cylinder 30 is provided with a reset spring 33 for resetting the drive rod 32; the front end of the drive rod 32 is frustum-shaped, and the rear end is provided with a second drive inclined surface 320 and a second longitudinal surface 321 for position holding; the drive rod 32 is located between four forming strips 31, and when the drive rod 32 slides away from the core-pulling sliding seat 1, it will simultaneously squeeze the four forming strips 31, and make the four forming strips 31 fit with the corresponding inner corners of the positioning cylinder 30; the upper mold is provided with a first side cutter 4 corresponding to the first drive inclined surface 10 and a second side cutter 5 corresponding to the second drive inclined surface 320. When the mold is closed, the first side cutter 4 will contact the first drive inclined surface 10 first.

[0022] When the mold is closed, the first side cutter 4 first contacts the first driving inclined surface 10, causing the core-pulling sliding seat 1 to move. When the four forming strips 31 reach the bending position, the core-pulling sliding seat 1 reaches the maximum travel position. Then the upper mold continues to move downward, the first side cutter 4 contacts the first longitudinal surface 11 to hold the position of the core-pulling sliding seat 1, and the second side cutter 5 contacts the second driving inclined surface 320, causing the driving rod 32 to move and spread the four forming strips 31 apart. After being spread into place, the four forming strips 31 combine to form the bending shape required for bending the workpiece. Then the second side cutter 5 contacts the second longitudinal surface 321 to hold the position of the driving rod 32. After bending is completed, the upper mold moves upward to open the mold, the second side cutter 5 and the first side cutter 4 move upward, and the driving rod 32 and the core-pulling sliding seat 1 are reset in sequence under the action of the return spring 33 and the elastic return member 2.

[0023] By applying the core-pulling mechanism of this application, the outer diameter of the core-pulling rod can be adjusted during a single mold opening and closing process. It can be made to reach the required size during the mold closing stage and its size can be reduced during the mold opening stage, thereby fundamentally solving the core-pulling problem.

[0024] Preferably, multiple sliding rods 310 distributed along the angle bisector direction are provided at the corners of the outer surface of the forming strip 31. Sliding bearings 300 that cooperate with the sliding rods 310 are provided at the corners of the inner wall of the positioning cylinder 30, and the sliding bearings 300 pass through the positioning cylinder 30. Positioning protrusions 301 are provided at each corner of the outer surface of the positioning cylinder 30. The sliding bearings 300 are fixed to the positioning protrusions 301. The positioning protrusions 301 have slots 302 to avoid the sliding rods 310, and spring pieces 303 that provide elastic force to the sliding rods 310 are provided within the slots 302. The structure is reasonable and compact. The cooperation of multiple sliding rods 310 and corresponding sliding bearings 300 ensures the reliability of the movement of the forming strip 31. At the same time, a single positioning protrusion 301 can correspond to multiple sliding rods 310, making processing more convenient and simplifying the structure. Furthermore, the positioning protrusions 301 also serve to position and cooperate with the positioning grooves described below, ensuring overall accuracy.

[0025] Preferably, the core-pulling slider seat 1 is provided with a transverse through hole 12 for mounting the positioning cylinder 30, and the inner wall of the through hole 12 is provided with four positioning grooves 120 that cooperate with the positioning protrusions 301; the outer surface of the core-pulling slider seat 1 is provided with a screw hole 13 that communicates with the through hole 12 and a tightening screw 14 that cooperates with the screw hole; the structure is simple, convenient for disassembling and assembling the positioning cylinder 30, and has high precision.

[0026] Preferably, the second side cutter 5 is disposed on the outer surface of the first side cutter 4 facing the core-pulling sliding seat 1, and the lowermost end of the lower surface of the first side cutter 4 is higher than the uppermost end of the lower surface of the second side cutter 5; in the mold-open state, the first driving inclined surface 10 and the second driving inclined surface 320 are on the same plane.

[0027] Preferably, the elastic reset component 2 includes a mounting base 20 and two nitrogen springs 21. One end of the nitrogen spring 21 is connected to the mounting base 20, and the other end is connected to the core-pulling sliding seat 1. The mounting base 20 is fixedly connected to the lower mold. The two nitrogen springs 21 are arranged side by side with a gap in between to avoid the first side cutter 4. The structure is simple, the overall integrity is good, and the reset effect of the core-pulling sliding seat 1 is good.

[0028] Preferably, a sliding seat 304 for slidingly connecting the drive rod 32 is provided inside the through hole 12, and a return spring 33 is sleeved on the drive rod 32. One end of the return spring 33 is fixedly connected to the drive rod 32, and the other end is fixedly connected to the inner wall of the through hole 12. The structure is simple, has good integrity, and has a good reset effect on the drive rod 32.

[0029] A method for applying a core-pulling mechanism for forming automotive headrest tubes, as described above, wherein the method includes the following steps:

[0030] When the mold is closed, the first side blade contacts the first driving inclined surface first, causing the core-pulling sliding seat to move. When the four forming strips reach the bending position, the core-pulling sliding seat reaches the maximum travel position.

[0031] Then the upper die continues to descend, the first side cutter contacts the first longitudinal surface to maintain the position of the core-pulling sliding seat, the second side cutter contacts the second driving inclined surface, causing the driving rod to move and spread the four forming strips. After being spread into place, the four forming strips combine to form the bending shape required for bending the workpiece. Then the second side cutter contacts the second longitudinal surface to maintain the position of the driving rod.

[0032] After bending is completed, the upper die moves upward to open the die, the second side cutter and the first side cutter move upward, and the drive rod and the core-pulling sliding seat are reset in sequence under the action of the reset spring and the elastic reset component;

[0033] By applying the method of this application, the outer diameter of the core-pulling rod can be adjusted during a single mold opening and closing process. It can be made to reach the required size during the mold closing stage and its size can be reduced during the mold opening stage, thereby fundamentally solving the core-pulling problem.

[0034] It should be understood that those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims.

Claims

1. A core-pulling mechanism for forming automotive headrest inserts, characterized in that, The device includes an upper mold and a lower mold. The lower mold is provided with a core-pulling slider seat and an elastic reset member for resetting the core-pulling slider seat. One side of the core-pulling slider seat has a first driving inclined surface and a first longitudinal surface for position holding, and the other side has one or more core-pulling rods. The core-pulling rod includes a square positioning cylinder, which is laterally fixed through the core-pulling slider seat. At each of the four corners of the positioning cylinder, a long strip with an L-shaped cross-section is slidably arranged, the sliding direction of which is along the angle bisector of the L-shape. A driving rod is slidably arranged along the length direction inside the positioning cylinder. A reset spring is provided inside the positioning cylinder to reset the drive rod; the front end of the drive rod is frustum-shaped, and the rear end is provided with a second drive ramp and a second longitudinal surface for position holding; the drive rod is located between the four forming strips, and when the drive rod slides away from the core-pulling slider seat, it will simultaneously squeeze the four forming strips, causing the four forming strips to fit against the corresponding inner angles of the positioning cylinder; the upper mold is provided with a first side cutter corresponding to the first drive ramp and a second side cutter corresponding to the second drive ramp, and when the mold is closed, the first side cutter will preferentially contact the first drive ramp; Multiple sliding rods are provided at the corners of the outer surface of the forming strip, distributed along the bisector of the angle. Sliding bearings that mate with the sliding rods are provided at the corners of the inner wall of the positioning cylinder, and the sliding bearings pass through the positioning cylinder. Positioning protrusions are provided at each corner of the outer surface of the positioning cylinder, and the sliding bearings are fixed to the positioning protrusions. The positioning protrusions have slots to avoid the sliding rods, and spring pieces that provide elastic force to the sliding rods are provided within the slots. The core-pulling slider seat has a transverse through hole for mounting the positioning cylinder, and the inner wall of the through hole has four positioning grooves that mate with the positioning protrusions. The second side blade is disposed on the outer surface of the first side blade facing the core-pulling slider seat, and the lowermost end of the lower surface of the first side blade is higher than the uppermost end of the lower surface of the second side blade; in the mold-open state, the first driving inclined surface and the second driving inclined surface are on the same plane; a sliding seat that is slidably connected to the driving rod is disposed in the through hole, and the return spring is sleeved on the driving rod, one end of the return spring being fixedly connected to the driving rod, and the other end being fixedly connected to the inner wall of the through hole.

2. The core-pulling mechanism for forming automotive headrest inserts according to claim 1, characterized in that, The outer surface of the core-pulling slider seat is provided with a screw hole that connects to the through hole and a tightening screw that mates with the screw hole.

3. The core-pulling mechanism for forming automotive headrest inserts according to claim 1, characterized in that, The elastic reset component includes a mounting base and two nitrogen springs. One end of each nitrogen spring is connected to the mounting base, and the other end is connected to the core-pulling slider seat. The mounting base is fixedly connected to the lower mold. The two nitrogen springs are arranged side by side with a gap in between to avoid the first side cutter.

4. A method for applying a core-pulling mechanism for forming automotive headrest inserts, applicable to the core-pulling mechanism for forming automotive headrest inserts as described in any one of claims 1-3, characterized in that, The method includes the following steps: When the mold is closed, the first side cutter contacts the first driving inclined surface first, causing the core-pulling slider to move. When the four forming strips reach the bending position, the core-pulling slider reaches the maximum travel position. Then the upper die continues to descend, the first side cutter contacts the first longitudinal surface to hold the position of the core-pulling slider seat, the second side cutter contacts the second driving inclined surface, causing the driving rod to move and spread the four forming strips. After being spread into place, the four forming strips combine to form the bending shape required for bending the workpiece. Then the second side cutter contacts the second longitudinal surface to hold the position of the driving rod. After bending is completed, the upper die moves upward to open, the second side cutter and the first side cutter move upward, and the drive rod and the core-pulling slider seat are reset in sequence under the action of the return spring and the elastic reset component.

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