Method of molding a vulcanization mold for a double dome dolly dust cover

Abstract

The application discloses a vulcanization mold with a double-end automobile ball head dust cover, which comprises an upper mold, a middle mold and a lower mold, at least one first mounting hole is formed in the middle mold, a first core is movably mounted in the first mounting hole, the two ends of the first core are arranged to extend out of the first mounting hole, an enlarged first end of the first core is arranged, and an enlarged second end of the first core is arranged with a first snap spring, a second mounting hole is arranged in the first core, a second core is movably mounted in the second mounting hole, the two ends of the second core are arranged to extend out of the first core, an enlarged first end of the second core is arranged, and an enlarged second end of the second core is arranged with a second snap spring, the lower mold is provided with a first mounting hole, and a moving plate is further arranged between the middle mold and the lower mold, wherein the moving plate is provided with a second mounting hole. The application has the advantages of simple structure and high practicability.

Description

Technical Field

[0001] This invention relates to the field of vulcanizing molds, and in particular, to a method for forming a vulcanizing mold for a double-top type automotive ball joint dust cover. Background Technology

[0002] Because the ball joint of a car suspension arm operates in high temperature, dusty and rainy conditions, a dust cover is needed to protect the ball joint.

[0003] Due to the special function of the dust cover, its inner walls at both ends are evenly distributed with several sealing rings. An annular groove is formed between any two adjacent sealing rings. The annular unevenness of the inner walls at both ends makes demolding resistance quite high. At the same time, the outer walls at both ends also have irregular unevenness. Furthermore, the dust cover has a shape that is wider in the middle and narrower at both ends, and is hollow inside. During demolding, the lower end must expand (because the workpiece is made of rubber, it is a soft workpiece and can expand) to break free from the core (the core fits the inner wall of the workpiece, having a shape that is wider in the middle and narrower at both ends) in order to successfully demold. Therefore, after vulcanization molding in the vulcanizing machine… Demolding is a serious problem. In traditional molds, the core is fixed and a molding cavity is formed between the core, the upper mold, and the middle mold. Workers use compressed air guns to blow away the uneven parts at the top and bottom of the workpiece. After the uneven parts are blown away and the workpiece is displaced from the traditional core, workers wearing heat-resistant gloves expand the bottom and overcome the large part in the middle of the core to demold. On the one hand, the demolding efficiency is low, resulting in low output per day; on the other hand, workers' fingers are often burned red; and on the other hand, excessive force is used during demolding, causing irreversible deformation of the workpiece. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of the prior art and at least partially solve the technical problems in the related art by providing a vulcanization mold for a double-top type of automotive ball joint dust cover, so as to achieve the purpose of rapid demolding of the workpiece.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a vulcanizing mold for a double-top type automotive ball joint dust cover, comprising an upper mold, a middle mold, and a lower mold. The middle mold has at least one first mounting hole, in which a first core is movably mounted. Both ends of the first core extend out of the first mounting hole. One end of the first core has a first enlargement, and the other end has a first retaining spring. A second mounting hole is provided inside the first core, in which a second core is movably mounted. Both ends of the second core extend out of the first core. One end of the second core has a second enlargement, and the other end has a second retaining spring. The upper mold has an upper chamber corresponding to the position of the first mounting hole. In the vulcanizing state, the upper chamber, the first enlargement, the second enlargement, and the first mounting hole form the forming cavity of the workpiece. The lower mold has a first placement hole corresponding to the position of the first mounting hole for positioning the first core and the second core. A movable plate is also provided between the middle mold and the lower mold. A second mounting hole is provided at the position corresponding to the mounting hole for placing the first core and the second core.

[0006] Furthermore, the intermediate mold includes a first plate and a second plate, which are fixed together by bolts.

[0007] Furthermore, the upper cavity is provided with a groove, and the second enlarged part is provided with a protrusion. During mold closing and vulcanization, the outer wall of the circular protrusion fits against the inner wall of the groove.

[0008] Furthermore, the first mounting hole is provided with a first annular surface with a cross-section that is larger at the top and smaller at the bottom, and the first enlarged part is provided with a second annular surface with a cross-section that is larger at the top and smaller at the bottom. During mold closing and vulcanization, the first annular surface and the second annular surface are in contact, and at this time, the first core extends out of the middle mold.

[0009] Furthermore, the second mounting hole is provided with a third annular surface with an isosceles trapezoidal cross-section, and the second core is provided with a fourth annular surface with an isosceles trapezoidal cross-section. During mold closing and vulcanization, the third annular surface and the fourth annular surface fit together, and the second core extends out of the first core.

[0010] Furthermore, the middle mold rectangular array has a first mounting hole, the upper mold rectangular array has a molding cavity, the lower mold rectangular array has a first placement hole, and the movable plate rectangular array has a second placement hole.

[0011] Furthermore, the intermediate mold is provided with 64 first mounting holes arranged in a rectangular pattern, and the upper mold is provided with smooth flow channels, which include a main channel and four branch channels located around the main channel in an oblique "+" shape. The intermediate mold is provided with 16 inner flow channels in an oblique "+" shape. The main channel is connected to the branch channels through connecting pipes, and the four ends of the branch channels are connected to the four inner flow channels at corresponding positions. The opening of the first mounting hole is provided with a notch, and the four ends of the inner flow channels are connected to the corresponding first mounting holes through the corresponding notches.

[0012] The main technical effects of this invention are reflected in the following aspects: 1. Semi-automatic demolding is achieved through the design of the movable plate and the movable first and second cores. 2. Compared with traditional processes, during demolding, the demolding resistance of the inner and outer surfaces of the lower end is overcome first, and then the demolding resistance of the lower end separating from the first core is overcome, preventing excessive force from causing irreversible deformation to the newly formed workpiece. 3. Part of the inner wall of the upper chamber, part of the outer surface of the first enlarged part, part of the outer surface of the second enlarged part, and part of the inner wall of the first mounting hole constitute the forming cavity. Due to the uniqueness of the workpiece, the middle mold is assembled through the first and second plates, solving the problem of the complexity of processing the first mounting hole in existing processes. 4. The first mounting hole has a first annular surface with a cross-section shaped like an isosceles trapezoid, wider at the top and narrower at the bottom. The first enlarged portion has a second annular surface with a cross-section shaped like an isosceles trapezoid, wider at the top and narrower at the bottom. The first and second annular surfaces fit together. The second mounting hole has a third annular surface with a cross-section shaped like an isosceles trapezoid, and the second core has a fourth annular surface with a cross-section shaped like an isosceles trapezoid. The third and fourth annular surfaces fit together. This design allows for better pressure resistance during mold closing. 5. The lower mold and the moving plate are provided with first and second mounting holes, making the structure of this invention more compact. At the same time, the space between two adjacent second mounting holes on the moving plate serves as a support part for stress, a very ingenious design. 6. The external shapes of the assembled first and second cores are similar to those of traditional fixed cores, but the structure in which the first and second cores can slide relative to each other is completely different from the prior art, a very ingenious design. 7: The first and second enlarged portions serve a limiting function: after assembly, the first and second enlarged portions fit into the interior of the workpiece; the second annular surface on the first enlarged portion and the fourth annular surface on the second enlarged portion bear the force. The design is both functional and ingenious. The four branch channels are arranged in a diagonal "+" shape, and the 16 internal flow channels are also arranged in a diagonal "+" shape. The design is reasonable and compact, and this arrangement allows for the maximum number of workpiece forming cavities within a limited space. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a top view of the present invention; Figure 3 This is a schematic diagram of the structure when the mold is closed in the A-A1 direction; Figure 4 This is a schematic cross-sectional view of the intermediate model along the A-A1 direction; Figure 5 for Figure 4 Enlarged schematic diagram of part G; Figure 6 This is a schematic diagram of the second core structure; Figure 7This is a schematic diagram of the assembly of the first core and the second core; Figure 8 A schematic diagram of the structure where the middle mold is lifted when the mold opens in the A-A1 direction; Figure 9 This is a schematic diagram of the structure in which the moving plate moves to the left in the A-A1 direction and the middle mold is lowered by a distance of H1+H2. Figure 10 for Figure 1 Enlarged view of part K. Detailed Implementation

[0014] The embodiments of the present invention are described in detail below. Examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention so that the technical solutions of the present invention are easier to understand and master, and should not be construed as limiting the present invention.

[0015] It should be noted that the mold of the present invention needs to be used in conjunction with a vulcanizing machine. When in use, it requires a cylinder or oil cylinder in the prior art to drive the upper mold 1, the middle mold 2, and the moving plate 7 to move. The lower mold 3 is fixed on the vulcanizing machine. During the movement, it is guided by a column-type guide for up and down movement and a guide rail type guide for left and right movement. In addition, the exhaust pipe set inside the mold is also in the prior art.

[0016] like Figure 1 , Figure 2 , Figure 3 , Figure 6 and Figure 7 The vulcanizing mold for a double-top type automotive ball joint dust cover includes an upper mold 1, a middle mold 2, and a lower mold 3. The middle mold 2 has a rectangular array of first mounting holes 4. A first core 5 is movably mounted in the first mounting holes 4, with both ends of the first core 5 extending out of the first mounting holes 4. One end of the first core 5 has a first enlargement 51, and the other end has a first retaining spring 52. The design of the first enlargement 51 and the first retaining spring 52 limits the vertical movement position and distance of the first core 5 within the first mounting holes 4. A second mounting hole is provided inside the first core 5, and a second core 6 is movably mounted in the second mounting hole. Both ends of the second core 6 extend out of the first core 5. One end of the mold 6 is provided with a second enlarged portion 61, and the other end is provided with a second retaining spring 62. The design of the second enlarged portion 61 and the second retaining spring 62 limits the vertical movement position and distance of the second core 6 in the second mounting hole. The lower mold 3 is provided with a first placement hole 31 for the first core 5 and the second core 6 to be positioned at the position corresponding to the first mounting hole 4. A movable plate 7 is also provided between the middle mold 2 and the lower mold 3. The movable plate 7 is provided with a second placement hole 71 for the first core 5 and the second core 6 to be positioned at the position corresponding to the first mounting hole 4. During mold closing and vulcanization, the first core 5 and the second core 6 can extend into the first placement hole 31 and the second placement hole 71.

[0017] like Figure 6 and Figure 7 As shown: the rod portion 01 of the first core 5 and the rod portion 01 of the second core 6 serve as guides.

[0018] like Figure 6 , Figure 7 and Figure 8 As shown: The upper mold 1 is provided with an upper chamber 11 at the position corresponding to the first mounting hole 4. The outer wall of the circular protrusion 611 fits the inner wall of the groove 111. The first annular surface 41 fits the second annular surface 511, and the third annular surface fits the fourth annular surface 621. In the vulcanization state, the first annular surface 41 fits the second annular surface 511, and the third annular surface fits the fourth annular surface 621. A portion of the inner wall of the upper chamber 11, a portion of the outer surface of the first enlarged portion 51, a portion of the outer surface of the second enlarged portion 61, and a portion of the inner wall of the first mounting hole 4 form a closed space relative to the rubber material. This space is the molding cavity of the workpiece 01.

[0019] like Figure 4 and Figure 5 As shown: During vulcanization, a portion of the inner wall of the upper chamber 11, a portion of the outer surface of the first enlarged portion 51, a portion of the outer surface of the second enlarged portion 61, and a portion of the inner wall of the first mounting hole 4 form a closed space relative to the rubber material. This space is the molding cavity of the workpiece 01. Since a portion of the inner wall of the first mounting hole 4 is part of the molding cavity, and the lower surface of the workpiece 01 has irregular concavities and convexities, the middle mold 2 includes a first plate 21 and a second plate 22, which are fixed by bolts. Through the above design, the concavities and convexities are separated. After the first plate 21 and the second plate 22 are assembled into the middle mold 2, the interior of the first mounting hole 4 has a structure that matches the irregular concavities and convexities of the lower end of the workpiece 01, thereby facilitating processing. In simple terms, hole D in the middle mold 2 is very difficult to process using existing technology. At the deepest part of hole D, there is also an annular plane F, which is a point that is difficult to process using existing technology.

[0020] like Figure 6 , Figure 7 and Figure 8 As shown: The upper chamber 11 is provided with a groove 111, and the second enlarged part 61 is provided with a protrusion 611. During mold closing and vulcanization, the outer wall of the circular protrusion 611 fits against the inner wall of the groove 111, so as to form a molding cavity that is relatively sealed during the molding of the rubber material.

[0021] like Figure 6 , Figure 7 and Figure 8As shown: The first mounting hole 4 is provided with a first annular surface 41 with a cross-section of an isosceles trapezoid that is larger at the top and smaller at the bottom. The first enlarged part 51 is provided with a second annular surface 511 with a cross-section of an isosceles trapezoid that is larger at the top and smaller at the bottom. During mold closing and vulcanization, the first annular surface 41 and the second annular surface 511 are in contact to form a molding cavity that is relatively sealed during the molding of the rubber material. At this time, the first core 5 extends out of the middle mold 2, and the first retaining spring 52 is at a certain distance from the middle mold 2. This distance is the maximum height H1 that the first core 5 rises relative to the middle mold 2.

[0022] like Figure 6 , Figure 7 and Figure 8 As shown: The second mounting hole is provided with a third annular surface with an isosceles trapezoidal cross-section, and the second enlarged part 61 is provided with a fourth annular surface 621 with an isosceles trapezoidal cross-section. During mold closing and vulcanization, the third annular surface and the fourth annular surface 621 are in contact to form a sealing molding cavity relative to the molding of the rubber material. At this time, the second core 6 extends out of the first core 5, and the second retaining spring 62 is a certain distance H2 from the end face of the first core 5. This H1+H2 is the maximum height that the second core 6 rises relative to the middle mold 2.

[0023] like Figure 2 As shown: The rectangular array of the middle mold 2 has a first mounting hole 4, the rectangular array of the upper mold 1 has a forming cavity, the rectangular array of the lower mold 3 has a first placement hole 31, and the rectangular array of the moving plate 7 has a second placement hole 71. The purpose is to set as many forming cavities as possible in a limited mold, so as to facilitate the processing of as many workpieces 01 as possible at one time.

[0024] Working principle: such as Figure 3 , Figure 8 and Figure 9 As shown: After starting the equipment and injecting the adhesive material and forming the mold, the upper mold 1 opens to overcome the demolding resistance of the irregular unevenness on the outer surface of the upper end of the workpiece 01. The middle mold 2 is lifted up, and the moving plate 7 is moved so that the second core 6 is positioned above the position between two adjacent second mounting holes 31. The middle mold 2 is then lowered. At this time, the first core 5 and the second core 6 rise together relative to the middle mold 2 by a distance H1 until the first retaining spring 52 presses against the middle mold 2. This process overcomes the demolding resistance of the irregular unevenness on the outer surface of the lower end of the workpiece 01 and the annular unevenness on the inner surface. Then, the second core 6 rises relative to the middle mold 2 by a distance H2 until the second retaining spring 62 presses against the end face of the first core 5. This process overcomes the demolding resistance of the workpiece 01 (small at the lower end and large in the middle) separating from the first core 5. Finally, the demolding resistance of the annular unevenness on the inner surface of the upper end of the workpiece 01 is overcome manually, and the workpiece 01 is removed.

[0025] like Figure 1 , such as 2 and Figure 10As shown: The intermediate mold is provided with 64 first mounting holes arranged in a rectangular pattern. The upper mold is provided with smooth flow channels, which include a main channel 121 and four branch channels 122 equidistantly located around the main channel 121 in an oblique "+" shape. The intermediate mold is designed to have 16 inner flow channels 123 in an oblique "+" shape. The main channel 121 is connected to the branch channels 122 through connecting pipes 124. The four ends of the branch channels are connected to the four inner flow channels 123 at the corresponding positions. The opening of the first mounting hole 4 is provided with a notch 125 with a depth of only 2mm. The four ends of the inner flow channels 123 are connected to the corresponding first mounting holes 4 through the corresponding notches 125.

[0026] The above-described injection principle involves the main channel 121 leading to four branch channels 122. Each branch channel 122 enters the corresponding inner flow channel 123 from its four ends, and each inner flow channel 123 enters the corresponding first mounting hole 4 from its four ends through the notch 125. Through this design, the rubber material can enter each molding cavity almost simultaneously and evenly, improving work efficiency. By designing as many molding cavities as possible in one mold, 64 products can be molded at once, resulting in high output.

[0027] Of course, the above are just typical examples of the present invention. In addition, the present invention may have many other specific embodiments. All technical solutions formed by equivalent substitution or equivalent transformation fall within the scope of protection claimed by the present invention.

Claims

1. A molding method for a vulcanizing mold of a double-topped automotive ball joint dust cover, comprising an upper mold, a middle mold, and a lower mold, characterized in that: The intermediate mold has at least one first mounting hole, in which a first core is movably mounted. Both ends of the first core extend out of the first mounting hole. One end of the first core has a first enlargement, and the other end has a first retaining spring. A second mounting hole is provided inside the first core, in which a second core is movably mounted. Both ends of the second core extend out of the first core. One end of the second core has a second enlargement, and the other end has a second retaining spring. The upper mold has an upper chamber at a position corresponding to the first mounting hole. In the vulcanization state, the upper chamber, the first enlargement, the second enlargement, and the first mounting hole form the forming cavity of the workpiece. The lower mold has a first placement hole at a position corresponding to the first mounting hole for positioning the first core and the second core. A movable plate is also provided between the intermediate mold and the lower mold. The movable plate has a second placement hole at a position corresponding to the first mounting hole for positioning the first core and the second core. After the injection molding process is completed, the upper mold is opened, the middle mold is lifted, and the moving plate is moved left and right to position the second core above the position between two adjacent second mounting holes. The middle mold is then lowered. At this time, the first core and the second core rise together relative to the middle mold by a distance H1 until the first retaining spring presses against the middle mold. Then, the second core rises relative to the middle mold by a distance H2 until the second retaining spring presses against the end face of the first core. The workpiece is then demolded and removed.

2. The molding method of the vulcanizing mold for the double-top type automotive ball joint dust cover according to claim 1, characterized in that, The intermediate mold includes a first plate and a second plate, which are fixed together by bolts.

3. The molding method of the vulcanizing mold for the double-top type automotive ball joint dust cover according to claim 1 or 2, characterized in that, The upper cavity is provided with a groove, and the second enlarged part is provided with a protrusion. During mold closing and vulcanization, the outer wall of the protrusion fits against the inner wall of the groove.

4. The molding method of the vulcanizing mold for the double-top type automotive ball joint dust cover according to claim 1 or 2, characterized in that, The first mounting hole has a first annular surface with a cross-section that is larger at the top and smaller at the bottom, and the first enlarged part has a second annular surface with a cross-section that is larger at the top and smaller at the bottom. During mold closing and vulcanization, the first annular surface and the second annular surface fit together, and at this time, the first core extends out of the middle mold.

5. The molding method of the vulcanizing mold for the double-top type automotive ball joint dust cover according to claim 1 or 2, characterized in that, The second mounting hole is provided with a third annular surface with an isosceles trapezoidal cross-section, and the second core is provided with a fourth annular surface with an isosceles trapezoidal cross-section. During mold closing and vulcanization, the third annular surface and the fourth annular surface fit together, and the second core extends out of the first core.

6. The molding method of the vulcanizing mold for the double-top type automotive ball joint dust cover according to claim 1, characterized in that, The first mounting holes of the middle mold are a rectangular array. In the initial state, the center line of the first mounting hole, the center line of the molding cavity, the center line of the first placement hole, and the center line of the second placement hole are on the same straight line.

7. The molding method of the vulcanizing mold for the double-top type automotive ball joint dust cover according to claim 1 or 6, characterized in that, The intermediate mold has 64 first mounting holes arranged in a rectangular pattern. The upper mold has smooth flow channels, including a main channel and four branch channels arranged in an oblique "+" shape around the main channel. The intermediate mold has 16 inner flow channels arranged in an oblique "+" shape. The main channel is connected to the branch channels through connecting pipes. The four ends of the branch channels are connected to the four inner flow channels at corresponding positions. The opening of the first mounting hole has a notch. The four ends of the inner flow channels are connected to the corresponding first mounting holes through the corresponding notches.

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