Molding Die for Rearview Mirror Seal and Seal for Borderless Rearview Mirror

Abstract

The present invention discloses a forming mold for a rearview mirror seal and a seal for a frameless rearview mirror, which relates to the field of injection molding molds for automotive accessories and is used to solve the problem that the seal is not easy to discharge materials smoothly due to its dense reinforcement structure. It includes a movable mold body and a fixed mold body that can be opened and closed linearly. The end face of the movable mold body is recessed with a mold groove of an annular structure, and the fixed mold body has a mold core of an annular structure. A plurality of sheet grooves are arranged annularly around the mold core, and the sheet grooves penetrate the inner and outer sides and the end face of the mold core, so that the mold core is divided into several core blocks. A rod barrel is fixed to the end face of each core block. In the present invention, the mold core and the mold groove form an injection molding chamber for the seal. During the demolding process, the mold sleeve and the mold plug body are outwardly abutted against the seal bound to the mold core under the action of elastic force, so that the rib plates of the seal can be smoothly axially withdrawn from the sheet grooves, ensuring the smooth completion of the material discharging work.

Description

Technical Field

[0001] The present invention relates to the field of injection molding dies for automotive parts, and particularly to a molding die for a rearview mirror seal and a seal for a frameless rearview mirror. Background Art

[0002] Since the lens of a frameless rearview mirror cannot move independently, the entire rearview mirror needs to be driven for angle adjustment. A spherical movable connection needs to be made between the rearview mirror and the base. To avoid air leakage and water seepage at this connection part, a spherical seal is provided at the connection part between the rearview mirror and the base to achieve movable sealed connection between the rearview mirror and the base.

[0003] The seal is injection molded through a mold. The traditional injection mold realizes molding processing and discharging by the closing and opening of two mold bodies. However, the spherical seal has a dense reinforcement structure, and the adhesion strength between the reinforcement structure, the main body of the seal and the mold is large during the discharging process, and smooth discharging becomes a difficult point in injection molding. Summary of the Invention

[0004] In order to make up for the deficiencies of the existing technology problems, the purpose of the present invention is to provide a molding die for a rearview mirror seal and a seal for a frameless rearview mirror, which are used to solve the problem that the seal is not easily discharged smoothly due to its dense reinforcement structure, and also solve the problem of difficult cooling during the molding process of the dense part of the seal structure.

[0005] In order to solve the existing technology problems, the technical solution of the present invention is as follows:

[0006] A molding die for producing a rearview mirror seal includes a movable mold body and a fixed mold body that can be opened and closed linearly. An annular mold groove is recessed on the end face of the movable mold body. The fixed mold body has an annular mold core, and a plurality of groove slices are annularly arranged around the mold core. The groove slices penetrate the inner and outer sides and the end face of the mold core, so that the mold core is divided into several core blocks. A rod cylinder is fixed on the end face of each core block. When the movable mold body and the fixed mold body are closed, the mold core is inserted into the mold groove. The outer side of the mold core and the outer side of the mold groove form an outer spherical shell molding space, the inner side of the mold core and the inner side of the mold groove form a lining shell molding space, the end face of the mold core and the end face of the mold groove form an annular surface molding space, the groove slices are rib plate molding spaces, and through holes are formed by injection molding around the rod cylinders.

[0007] Preferably, the fixed mold body includes a mold base, the mold core is located at the end of the mold base, a mold sleeve and a mold plug body that are fixedly adapted are respectively slidably fitted on the outer side and the inner side of the mold base, so that the mold sleeve and the mold plug body can slide along the axial direction of the mold base. A spring is connected between the mold plug body and the mold base, so that the mold sleeve and the mold plug body have a tendency to slide towards the mold core.

[0008] Preferably, a push rod is slidably inserted into the wall of the mold sleeve, and the end of the push rod can slide out of the end surface of the mold sleeve. A gear is rotatably arranged on the inner side of the mold sleeve, a second rack is arranged on the surface of the push rod, and a first rack is arranged on the outer wall of the mold base. The gears are synchronously meshed and connected with the first rack and the second rack.

[0009] Preferably, a plurality of injection channels are arranged inside the mold base, and the injection channels extend to the inner side of each of the core blocks one by one, so that the injection channels are connected with the molding space of the liner shell.

[0010] Preferably, cooling channels are provided inside the movable mold body, both inside and outside the mold groove, and the inlet and outlet ends of the cooling channels pass through the surface of the movable mold body.

[0011] Preferably, a liquid cavity is provided inside each of the core blocks, and the liquid cavities in every two adjacent core blocks are connected through a U-shaped channel. The rod barrel penetrates each liquid cavity one by one, and guide holes penetrating the end surface of the mold groove are arranged inside the movable mold body. The guide holes are aligned with the rod barrel one by one, and adjacent guide holes are alternately connected to the inlet and outlet ends of the cooling channel.

[0012] Preferably, the inner end of the guide hole passes through the cooling channel through a telescopic groove, the connecting part between the guide hole and the telescopic groove is a first tapered opening with a large opening facing outward, a tapered plug is elastically installed in the telescopic groove through a spring, and the tapered plug is used to block the first tapered opening, and the end of the rod barrel is a second tapered opening with a small opening facing outward, a valve ball is elastically installed inside the rod barrel through a spring, and the valve ball is used to block the second tapered opening.

[0013] Preferably, a guide frame is provided between the movable mold body and the fixed mold body, the fixed mold body and the guide frame are fixed, and the movable mold body and the guide frame slide, so that the movable mold body can move linearly to close or separate from the fixed mold body, and a cylinder for pushing the movable mold body to move is provided at one end of the guide frame, the end face of the fixed mold body has an axial column, and the end face of the movable mold body has an axial hole for aligning the axial column.

[0014] A seal for a frameless rearview mirror which is injection molded using a molding mold for the rearview mirror seal, comprises an inner lining shell and an outer spherical shell which are coaxially distributed inside and outside, wherein the small diameter end of the outer spherical shell is connected to one end of the inner lining shell via an annular surface, a plurality of ribs are annularly distributed between the outer spherical shell and the inner lining shell, the ribs are fixedly connected to the inner lining shell, the outer spherical shell and the annular surface, a plurality of through holes are provided around the annular surface, and the gaps between the through holes and the ribs are aligned.

[0015] Compared with the prior art, the advantages of the present invention are as follows:

[0016] 1. The present invention forms an injection molding chamber for the seal through a mold core and a mold groove. During the demolding process, the mold sleeve and the mold plug body are pushed outward against the seal bound to the mold core by elastic force, so that the rib plate of the seal can be smoothly axially disengaged from the sheet groove, thereby ensuring smooth completion of the discharge work.

[0017] 2. During the discharging process of the present invention, the gear meshes with the first rack for transmission, enabling the gear to drive the second rack to drive the push rod to protrude from the end face of the die sleeve, so that the push rod can assist the axial constant-pressure seal, expanding the discharging range of the seal.

[0018] 3. In the present invention, liquid cavities are opened in each core block, and two liquid cavities in each group form a circulation channel. During the injection molding process, the rod barrel is inserted into the guide hole to penetrate the inlet and outlet of the cooling channel, enabling the liquid in the liquid cavity to circulate and conduct the coolant, playing a role in cooling the inner side of the outer spherical shell, the inner side of the inner lining shell, and the inner side of the ring surface, ensuring that the seal is quickly cooled and formed, and avoiding deformation of the inner side of the seal caused by cooling differences.

[0019] 4. In the present invention, a valve ball is elastically arranged at the port of the rod barrel, and a tapered plug is elastically arranged at the connection part of the guide hole and the telescopic groove. When the rod barrel is inserted into the guide hole, the tapered plug and the valve ball automatically squeeze and open the channel. When the rod barrel is withdrawn from the guide hole, the tapered plug and the valve ball automatically close the channel, avoiding coolant leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic structural diagram of the seal of the present invention.

[0021] Figure 2 It is a schematic structural diagram of the molding die of the present invention.

[0022] Figure 3 It is a schematic structural diagram of the fixed mold body of the present invention.

[0023] Figure 4 It is a schematic structural diagram of the moving mold body of the present invention.

[0024] Figure 5 It is a schematic closed structure diagram of the fixed mold body and the moving mold body of the present invention.

[0025] Figure 6 It is a schematic structural diagram of the rod barrel penetrating the cooling channel of the present invention.

[0026] Figure 7 It is a schematic liquid cavity connection structure diagram of the present invention.

[0027] Reference numerals: 11, outer spherical shell; 12, inner lining shell; 13, ring surface; 14, through hole; 15, rib plate; 2, moving mold body; 21, mold cavity; 22, guide hole; 23, cooling channel; 3, mold base; 31, mold core; 32, chip groove; 33, injection molding channel; 34, liquid cavity; 35, U-shaped channel; 4, die sleeve; 41, die plug body; 5, rod barrel; 51, telescopic groove; 52, tapered plug; 53, valve ball; 6, axial column; 61, axial hole; 7, push rod; 71, gear; 72, first rack; 73, second rack. DETAILED DESCRIPTION OF THE INVENTION

[0028] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments.

[0029] As Figure 1 shown, the seal is composed of an outer spherical shell 11, an inner lining shell 12, an annular surface 13, and rib plates 15. The outer spherical shell 11 is spherical with a large diameter at one end and a small diameter at the other end. The inner lining shell 12 is a circular tube with a uniform diameter. The inner lining shell 12 is coaxially arranged inside the outer spherical shell 11. The small-diameter end of the outer spherical shell 11 is integrally connected to the end of the inner lining shell 12 through the annular surface 13. A number of rib plates 15 are annularly distributed between the outer spherical shell 11 and the inner lining shell 12. The rib plates 15 radially extend and are fixedly connected to the inner lining shell 12, the outer spherical shell 11, and the annular surface 13. A number of through holes 14 are evenly opened around the annular surface 13, and the through holes 14 are aligned with the gaps between the rib plates 15;

[0030] When using the seal to connect the frameless rearview mirror and the base, the inner lining shell 12 is sleeved on the shaft part of the base, the annular surface 13 abuts against the driving component inside the rearview mirror, and screws are used to pass through the through holes 14 to connect the seal with the driving component of the rearview mirror. A rubber ring is arranged inside the interface of the rearview mirror, and the rubber ring contacts the surface of the outer spherical shell 11. When adjusting the angle of the rearview mirror, the rubber ring always remains in contact with the outer spherical shell 11, performing movable sealing on the connection part of the rearview mirror to avoid air leakage and water leakage. The setting of the rib plates 15 increases the anti-deformation connection strength between the outer spherical shell 11 and the inner lining shell 12.

[0031] The above-mentioned seal is injection molded by using the following molding die;

[0032] As Figure 2 shown, the injection mold mainly includes a moving die body 2, a fixed die body, an opening and closing driving component, an injection system, and a cooling system;

[0033] As Figure 4 shown, the end face of the moving die body 2 is annularly recessed inward to form a mold cavity 21. The outer edge surface of the mold cavity 21 is a spherical surface, and the inner edge surface of the mold cavity 21 is an annular surface;

[0034] As Figure 3As shown in the figure, the fixed mold body has a mold base 3. The mold base 3 is in the shape of a barrel with a single-end seal. An annular mold core 31 is integrally provided on the open end face of the mold base 3. The outer side surface of the mold core 31 is spherical, and the inner side surface is an annular surface. A number of groove 32 are arranged annularly around the mold core 31. The groove 32 penetrate the inner and outer sides and the end face of the mold core 31, so that the mold core 31 is divided into several core blocks. A rod cylinder 5 is fixed to the end face of each core block. A mold plug body 41 is slidably arranged inside the mold base 3 in a matching manner, and a mold sleeve 4 is slidably arranged outside the mold base 3 in a matching manner. The surface of the mold base 3 is provided with a limiting slideway extending axially. A limiting slide body is provided in the limiting slideway. The mold sleeve 4 and the mold plug body 41 are fixed through the limiting slide body, so that the mold sleeve 4 and the mold plug body 41 can slide axially along the mold base 3 synchronously. A spring is connected between the mold plug body 41 and the mold base 3. The elastic force makes the mold sleeve 4 and the mold plug body 41 tend to move towards the mold core 31;

[0035] As Figure 5 shown in the figure, the injection molding system is arranged in the mold base 3. An injection port is arranged at the center position of the end face of the mold base 3 away from the moving mold body 2. The injection port is connected to a number of injection channels 33. The injection channels 33 extend along the side wall of the mold base 3. The injection channels 33 extend to the inside of each core block one by one and penetrate the inner surface of the mold core 31;

[0036] As Figure 5 shown in the figure, the cooling system is arranged in the moving mold body 2. Cooling channels 23 are arranged on both the inner and outer sides of the mold cavity 21 inside the moving mold body 2. The cooling channels 23 are multiple annular channels or spiral channels. The inlet and outlet ends of the cooling channels 23 penetrate the surface of the moving mold body 2, and can make the coolant conduct in a one-way cycle;

[0037] As Figure 2 shown in the figure, the opening and closing driving component includes a guiding frame. The mold base 3 of the fixed mold body is fixed at one end of the guiding frame. The moving mold body 2 slides with the guiding frame. A cylinder for pushing the moving mold body 2 to move is arranged at one end of the guiding frame;

[0038] The injection process of the seal is as follows:

[0039] A screw injection molding machine is connected to the end face of the mold base 3. The cylinder is opened to extend, causing the moving mold body 2 to move and fit with the fixed mold body. The mold core 31 is inserted into the mold groove 21. The end face of the mold sleeve 4 fits the outer ring plane at the end of the moving mold body 2. The exhaust holes are arranged at the outer ring plane part of the end of the moving mold body 2. The end face of the mold plug body 41 fits the inner plane at the end of the moving mold body 2. An injection cavity is formed between the mold core 31 and the mold groove 21. The injection molding machine extrudes the material into the injection port and then guides it into the injection cavity through each injection channel 33. The injection material first enters between the inner side of the mold core 31 and the inner side of the mold groove 21 to form the inner lining shell 12, forms the rib plates 15 in each piece groove 32, then forms the annular surface 13 between the end face of the mold core 31 and the end face of the mold groove 21, forms the through holes 14 around the rod barrel 5, and then forms the outer spherical shell 11 between the outer side of the mold core 31 and the outer side of the mold groove 21. The gas in the injection cavity is gradually discharged;

[0040] Coolant is circulated into the cooling channel 23 from the inlet and outlet ends of the cooling channel 23 to cool the injection material in the injection cavity so that it quickly forms into a seal. Then, the cylinder is contracted to move the moving mold body 2 to separate from the fixed mold body. Due to the dense adhesion of the rib plates 15 by the piece grooves 32 and the adhesion of the through holes 14 by the rod barrel 5, the formed seal remains fixed to the fixed mold body during the opening process of the moving mold body 2. Since the mold sleeve 4 and the mold plug body 41 lose the extrusion restraint of the moving mold body 2, they axially slide under the elastic force. By axially contacting the seal with the mold sleeve 4 and the mold plug body 41, the rib plates 15 are axially withdrawn from the piece grooves 32, and the rod barrel 5 and the through holes 14 axially slide and separate, causing the seal to automatically demold and fall off.

[0041] The injection material first enters between the inner side of the mold core 31 and the inner side of the mold groove 21 to form the inner lining shell 12, which cannot achieve the smooth exhaust of the injection material from the inside to the outside, and makes the surface of the formed outer spherical shell 11 smooth and complete, ensuring that the seal has a good sealing effect.

[0042] As Figure 5 shown, two push rods 7 are symmetrically and slidably inserted into the two side walls of the mold sleeve 4. The push rods 7 are L-shaped, and the ends of the push rods 7 can slidably protrude from the end face of the mold sleeve 4. An installation gear 71 is rotatably arranged inside the mold sleeve 4. A second rack 73 is arranged on the surface of the push rod 7, and a first rack 72 is arranged on the outer wall of the mold base 3. The gear 71 is synchronously meshed with the first rack 72 and the second rack 73;

[0043] During injection molding, the ends of the push rods 7 and the end face of the mold sleeve 4 remain flat. During the demolding process of the formed part, the mold sleeve 4 and the mold plug body 41 elastically slide to push out the formed part. During this process, due to the relative sliding between the mold sleeve 4 and the mold base 3, the gear 71 rotates along the first rack 72. Through the meshing transmission of the gear 71 and the second rack 73, the push rods 7 protrude from the end face of the mold sleeve 4 to assist in pushing out the formed part, expanding the pushing distance and ensuring that the formed part can fall off smoothly.

[0044] Due to the high density of the structure connecting the outer spherical shell 11, the inner lining shell 12, and the rib plate 15 on the inner side of the toroidal surface 13, it is difficult to reduce the heat during the injection molding process, and it is easy to have uneven cooling, resulting in deformation of the inner structure of the seal. The following is the design for targeted cooling of the inner side of the toroidal surface 13:

[0045] As Figure 5 , Figure 6 , Figure 7 shown, a liquid cavity 34 is opened inside each core block, and the liquid cavities 34 in every two adjacent core blocks are connected through a U-shaped channel 35. The rod cylinder 5 penetrates through each liquid cavity 34 one by one. A number of guide holes 22 corresponding to the rod cylinder 5 in one-to-one correspondence are arranged at the end face of the mold cavity 21. The inner ends of adjacent guide holes 22 are alternately connected to the inlet and outlet ends of the cooling channel 23 through the telescopic groove 51. The connection part between the guide hole 22 and the telescopic groove 51 is a first tapered opening with a large mouth facing outwards. A tapered plug 52 is elastically installed in the telescopic groove 51 through a spring, and the tapered plug 52 is used to block the first tapered opening. The end of the rod cylinder 5 is a second tapered opening with a small mouth facing outwards. A valve ball 53 is elastically installed inside the rod cylinder 5 through a spring, and the valve ball 53 is used to block the second tapered opening;

[0046] When the moving mold body 2 and the fixed mold body are closed for injection molding work, the rod cylinder 5 is inserted into the guide hole 22, and the valve ball 53 and the tapered plug 52 are mutually pressed to open and penetrate the first tapered opening and the second tapered opening. The coolant in the cooling channel 23 can enter one of each group of liquid cavities 34 through the rod cylinder 5, then be introduced into another liquid cavity 34 through the U-shaped channel 35, and then be guided back to the cooling channel 23 through the rod cylinder 5, realizing the automatic circulation and conduction of the coolant in the liquid cavity 34. The coolant in the liquid cavity 34 plays a role in cooling the inner sides of the outer spherical shell 11, the inner lining shell 12, and the toroidal surface 13, ensuring the rapid cooling and molding of the seal, and avoiding deformation of the inner side of the seal caused by cooling differences;

[0047] When the moving mold body 2 and the fixed mold body are separated for demolding, the rod cylinder 5 is pulled out from the guide hole 22, and the elastic force makes the tapered plug 52 block the first tapered opening and the valve ball 53 block the second tapered opening, avoiding the leakage of liquid.

[0048] As Figure 5 shown, the end face of the fixed mold body has an axial column 6, and the end face of the moving mold body 2 has an axial hole 61 for aligning with the axial column 6. The axial column 6 is inserted into the axial hole 61, enabling the fixed mold body and the moving mold body 2 to be accurately axially aligned and fitted.

[0049] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A molding die for producing a rearview mirror seal, comprising a movable die body (2) and a fixed die body that can be opened and closed linearly, characterized in that: The end surface of the movable mold body (2) is recessed and provided with a mold groove (21) of an annular structure; the fixed mold body has a mold core (31) of an annular structure; a plurality of sheet grooves (32) are arranged in an annular manner around the mold core (31); the sheet grooves (32) penetrate the inner and outer sides and the end surface of the mold core (31), so that the mold core (31) is divided into a plurality of core blocks; the end surface of each core block is fixed with a rod barrel (5); when the movable mold body (2) and the fixed mold body are closed, the mold core (31) is inserted into the mold groove (21); the outer side of the mold core (31) and the outer side of the mold groove (21) form a molding space for the outer spherical shell (11); the inner side of the mold core (31) and the inner side of the mold groove (21) form a molding space for the inner liner shell (12); the end surface of the mold core (31) and the end surface of the mold groove (21) form a molding space for the annular surface (13); the sheet grooves (32) form a molding space for the rib plate (15); and the periphery of the rod barrel (5) is injection molded to form a through hole (14); The fixed mold body comprises a mold base (3), the mold core (31) is located at the end of the mold base (3), and the outer side and the inner side of the mold base (3) are respectively slidably adapted with a mold sleeve (4) and a mold plug body (41) fixed thereto, so that the mold sleeve (4) and the mold plug body (41) can slide axially along the mold base (3), and a spring is connected between the mold plug body (41) and the mold base (3), so that the mold sleeve (4) and the mold plug body (41) have a tendency to slide towards the mold core (31).

2. The molding die for the rearview mirror seal according to claim 1, characterized in that: A push rod (7) is slidably inserted into the wall of the mold sleeve (4), the end of the push rod (7) can slidably protrude from the end surface of the mold sleeve (4), a gear (71) is rotatably arranged on the inner side of the mold sleeve (4), a second rack (73) is arranged on the surface of the push rod (7), a first rack (72) is arranged on the outer wall of the mold base (3), and the gear (71) is synchronously meshed with the first rack (72) and the second rack (73).

3. The molding die for the rearview mirror seal according to claim 1, characterized in that: A plurality of injection channels (33) are arranged inside the mold base (3), and the injection channels (33) extend one by one to the inner side of each of the core blocks, so that the injection channels (33) are connected to the molding space of the liner shell (12).

4. The molding die for the rearview mirror seal according to claim 1, characterized in that: The movable mold body (2) is provided with cooling channels (23) both inside and outside the mold groove (21), and the inlet and outlet ends of the cooling channels (23) penetrate the surface of the movable mold body (2).

5. The molding die for the rearview mirror seal according to claim 4, characterized in that: A liquid cavity (34) is provided inside each of the core blocks, and the liquid cavities (34) in every two adjacent core blocks are connected via a U-shaped channel (35). The rod barrel (5) passes through each of the liquid cavities (34) one by one. A guide hole (22) penetrating the end surface of the mold groove (21) is provided inside the movable mold body (2). The guide holes (22) are aligned with the rod barrel (5) one by one, and adjacent guide holes (22) are alternately connected to the inlet and outlet ends of the cooling channel (23).

6. The molding die for the rearview mirror seal according to claim 5, characterized in that: The inner end of the guide hole (22) passes through the cooling channel (23) via the telescopic groove (51); the connecting portion between the guide hole (22) and the telescopic groove (51) is a first tapered opening with a large opening facing outwards; a tapered plug (52) is elastically mounted in the telescopic groove (51) via a spring; the tapered plug (52) is used to block the first tapered opening; the end of the rod tube (5) is a second tapered opening with a small opening facing outwards; a valve ball (53) is elastically mounted in the rod tube (5) via a spring; the valve ball (53) is used to block the second tapered opening.

7. The molding die for the rearview mirror seal according to claim 1, characterized in that: A guide frame is provided between the movable mold body (2) and the fixed mold body, the fixed mold body and the guide frame are fixed, and the movable mold body (2) and the guide frame slide, so that the movable mold body (2) can move linearly to close or separate from the fixed mold body, and a cylinder for pushing the movable mold body (2) to move is provided at one end of the guide frame, the end surface of the fixed mold body has an axial column (6), and the end surface of the movable mold body (2) has an axial hole (61) aligned with the axial column (6).

8. A seal for a frameless rearview mirror, injection molded by using the molding mold for the rearview mirror seal according to any one of claims 1 to 7, characterized in that: The invention comprises an inner liner shell (12) and an outer spherical shell (11) which are coaxially distributed inside and outside. The small diameter end of the outer spherical shell (11) is connected to one end of the inner liner shell (12) via an annular surface (13). A plurality of ribs (15) are distributed in an annular shape between the outer spherical shell (11) and the inner liner shell (12). The ribs (15) are fixedly connected to the inner liner shell (12), the outer spherical shell (11) and the annular surface (13). A plurality of through holes (14) are provided around the annular surface (13). The gaps between the through holes (14) and the ribs (15) are aligned.

Images