A composite door pedal BMC injection molding machine

Abstract

The present invention relates to a composite door pedal BMC injection molding machine, comprising a frame, a feeding part and a molding part; the molding part comprises a first oil cylinder, a mold and a sliding device; the mold is arranged on the sliding device, the first oil cylinder realizes the opening and closing of the mold by driving the sliding device, and the sliding device drives the mold to move horizontally; the feeding part supplies raw materials into the mold; the sliding device comprises a slide plate and a sliding body, the slide plate moves on the guide rail of the sliding body, the slide plate performs injection molding at the middle station of the sliding body, and the slide plate places or removes the mold on both sides of the sliding body. The present invention solves the problem that the periphery of the composite door pedal BMC injection molding product cannot be glued, and a section of material rod is left after glue is injected in the middle of the product and needs subsequent processing, thereby improving production efficiency, reducing material loss, reducing processes and reducing costs.

Description

Technical Field

[0001] The invention relates to the technical field of injection molding, and in particular to a BMC injection molding machine for a composite door pedal. Background Art

[0002] BMC is the abbreviation of Bulk Molding Compound, which is a semi-dry molding intermediate material for manufacturing glass fiber reinforced thermosetting products, mostly used for molding and injection molding. Composite door pedals are made by combining composite door pedals (mostly aluminum alloy) with BMC parts, and the product is relatively long, so the common practice on the market is to die-cast the composite door pedals and BMC parts. However, the die-casting method can only process one workpiece at a time, with low processing efficiency, poor bonding between the composite door pedal and the BMC material, and indentations will also be formed on the surface of the composite door pedal, affecting the production efficiency and quality of the product. Summary of the invention

[0003] The purpose of the present invention is to provide a BMC injection molding machine for composite door pedals with high production efficiency and good product quality in view of the deficiencies in the prior art.

[0004] To achieve this object, the present invention adopts the following technical solutions:

[0005] A composite door pedal BMC injection molding machine comprises a frame, a feeding part and a molding part; the molding part comprises a first oil cylinder, a mold and a sliding device; the mold is arranged on the sliding device, the first oil cylinder drives the sliding device to open and close the mold, and the sliding device drives the mold to move horizontally; the feeding part supplies raw materials into the mold;

[0006] The sliding device comprises a slide plate and a slide body, wherein the slide plate moves on the guide rail of the slide body, the slide plate performs injection molding at the middle station of the slide body, and the slide plate places or takes out the mold at both sides of the slide body.

[0007] To further explain, the feeding part includes a second oil cylinder, a piston, a hopper, a barrel and a screw; the second oil cylinder drives the piston to move in the hopper, and the screw in the barrel injects the raw material in the hopper into the mold through the screw.

[0008] Further explanation, the mold includes an upper mold plate, a lower mold plate, a flow channel plate, a nozzle, a needle valve and a needle valve plate;

[0009] An upper mold cavity and a lower mold cavity are provided between the upper mold plate and the lower mold plate;

[0010] A needle valve is provided in the nozzle, and the needle valve is connected to the needle valve plate;

[0011] A flow channel insert and a diverter plate are arranged in the flow channel plate; the flow channel insert and a plurality of nozzles are connected through the diverter plate; a water cooling channel is arranged in the flow channel plate, a water cooling gap is arranged between the lower template and the nozzle, and the water cooling gap is connected with the water cooling channel to form a water cooling circuit.

[0012] As a further explanation, a plurality of composite door pedals are provided between the upper mold cavity and the lower mold cavity, and the composite door pedals correspond to the positions of the nozzles; when the injection molding is stopped, the needle valve is pressed against the surface of the composite door pedals.

[0013] To further explain, the nozzle includes an injection section and a cut-off section, a gap is provided between the injection section and the needle valve to form an injection channel, and an inner diameter of the cut-off section is consistent with an outer diameter of the needle valve.

[0014] As a further explanation, the diverter plate is provided with a first channel connected to the flow channel insert and a second channel connected to the bottom of the nozzle; the first channel and the second channel form a T-shaped channel, and a cold material well is provided at the end of the first channel.

[0015] To further explain, the outer wall of the nozzle is divided into a base, a first outer wall section and a second outer wall section; the first outer wall section, the second outer wall section and the base form a step-by-step structure; the first outer wall section is arranged in the lower mold plate, the second outer wall section is arranged in the lower mold cavity, and the base is arranged in the flow channel plate.

[0016] As a further explanation, the water cooling gap is arranged on the outside of the second outer wall segment.

[0017] The beneficial effects of the present invention are as follows: the problem that the periphery of the composite door pedal BMC injection molding product cannot be glued, and a section of material stick is left after glue is injected in the middle of the product and needs subsequent processing is solved, thereby improving production efficiency, reducing material loss, reducing processes and reducing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0019] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present invention;

[0020] Figure 2 is a side structural schematic diagram of an embodiment of the present invention;

[0021] Figure 3 It is a three-dimensional structural schematic diagram of a mold according to an embodiment of the present invention;

[0022] Figure 4 1 is a schematic side view of a mold according to an embodiment of the present invention;

[0023] Figure 5 1 is a schematic cross-sectional structure diagram of a mold according to an embodiment of the present invention;

[0024] Figure 6 is a schematic diagram of the assembly of a flow channel insert, a diverter plate and a nozzle according to an embodiment of the present invention;

[0025] Figure 7 is a cross-sectional view of a nozzle according to an embodiment of the present invention.

[0026] Among them: frame 001, feeding part 002, second cylinder 0021, piston 0022, hopper 0023, barrel 0024, screw 0025, forming part 003, first cylinder 0031, mold 0032, sliding device 0033, slide plate 033a, slide body 033b, upper template 1, lower template 2, flow channel plate 3, flow channel insert 31, diverter plate 32, first channel 321, second channel 322, cold material well 323, water cooling channel 33, water cooling gap 34, base 35, first outer wall section 36, second outer wall section 37, nozzle 4, injection section 41, truncation section 42, needle valve 5, needle valve plate 6, upper model cavity 01, lower model cavity 02 and composite door pedal 03. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0028] like Figure 1-Figure 7 As shown, a composite door pedal BMC injection molding machine includes a machine 001, a feeding part 002 and a molding part 003; the molding part 003 includes a first oil cylinder 0031, a mold 0032 and a sliding device 0033; the mold 0032 is arranged on the sliding device 0033, the first oil cylinder 0031 realizes the opening and closing of the mold 0032 by driving the sliding device 0033, and the sliding device 0033 drives the mold 0032 to move horizontally; the feeding part 002 supplies raw materials into the mold 0032;

[0029] The sliding device 0033 includes a slide plate 033a and a slide body 033b. The slide plate 033a moves on the guide rail of the slide body 033b. The slide plate 033a performs injection molding at the middle station of the slide body 033b. The slide plate 033a places or removes the mold 0032 on both sides of the slide body 033b.

[0030] During the injection molding operation, one mold 0032 is being injected in the molding section 003, and preparations for injection molding of another mold 0032 can be made on the slide 033a. After the injection molding of the current mold 0032 is completed, it is moved to the other side of the slide 033a and removed. At the same time, the prepared mold 0032 is pushed from the slide 033a to the injection molding station, thereby achieving seamless connection of the injection molding processes of the two molds 0032 and improving production efficiency.

[0031] To further explain, the feeding part 002 includes a second cylinder 0021, a piston 0022, a hopper 0023, a barrel 0024 and a screw 0025; the second cylinder 0021 drives the piston 0022 to move in the hopper 0023, and the screw 0025 in the barrel 0024 injects the raw material in the hopper 0023 into the mold 0032 through the screw 0025.

[0032] To further illustrate, the mold 0032 includes an upper mold plate 1, a lower mold plate 2, a flow channel plate 3, a nozzle 4, a needle valve 5 and a needle valve plate 6;

[0033] An upper mold cavity 01 and a lower mold cavity 02 are provided between the upper mold plate 1 and the lower mold plate 2;

[0034] The nozzle 4 is provided with a needle valve 5, and the needle valve 5 is connected to the needle valve plate 6;

[0035] A flow channel insert 31 and a diverter plate 32 are provided in the flow channel plate 3; the flow channel insert 31 and multiple nozzles 4 are connected through the diverter plate 32; a water cooling channel 33 is provided in the flow channel plate 3, and a water cooling gap 34 is provided between the lower template 2 and the nozzle 4, and the water cooling gap 34 is connected with the water cooling channel 33 to form a water cooling circuit.

[0036] Injection molding is more efficient than die casting. In order to further improve the efficiency of injection molding, the BMC material injected from the flow channel plate 3 is divided into two side branches through the diverter plate 32 set in the flow channel plate 3, and enters the corresponding cavity respectively, so as to achieve the effect of simultaneously injecting two cavities. Since BMC is a thermosetting material, the BMC material ejected from the nozzle 4 needs to maintain a temperature of 30℃-70℃. Therefore, after the nozzle 4 is cooled by the water cooling circuit, it can be ensured that the BMC material at the front end of the nozzle 4 will not solidify, so as to prevent the solidified BMC material from clogging the mold.

[0037] For further explanation, a plurality of composite door pedals 03 are provided between the upper mold cavity 01 and the lower mold cavity 02 , and the composite door pedals 03 correspond to the positions of the nozzles 4 ; when the injection molding is stopped, the needle valve 5 presses against the surface of the composite door pedals 03 .

[0038] The needle valve 5 in the middle of the nozzle 4 moves back, and the BMC raw material is injected into the mold cavity from the nozzle 4. When the mounting plate of the needle valve 5 is pushed forward, the needle valve 5 extends from the front end of the nozzle 4 to block the flow channel of the glue inlet inside the nozzle. The top of the needle valve 5 reaches the surface of the product, cuts off the flow channel inside the nozzle 4 to continue to pass the material, and the BMC raw material is thermally cured and formed in the mold cavity at 135℃-185℃. Because the needle valve 5 is directly ejected to the surface of the product, after the BMC material is cured, no additional material rods will be generated at the corresponding part of the nozzle 4 of the product, and no secondary processing is required to remove the material rods, which reduces material loss, reduces processes and reduces costs. For a better solution, the length of the flow channel insert 31 is adjusted according to the length of the product, so that the nozzle 4 is injected from the wider part in the middle of the product. First, injection molding from the middle facilitates the diffusion of BMC materials to both ends, which speeds up the injection molding speed; secondly, the part corresponding to the wider part in the middle of the product is also wide, which can also speed up the injection molding speed. By adjusting the position of the injection point, it is possible to avoid the BMC material from solidifying due to staying in the mold flow channel for too long.

[0039] To further explain, the nozzle 4 includes an injection section 41 and a cut-off section 42 . A gap is provided between the injection section 41 and the needle valve 5 to form an injection channel. The inner diameter of the cut-off section 42 is consistent with the outer diameter of the needle valve 5 .

[0040] When the needle valve 5 retreats, the BMC material is ejected from the nozzle 4 through the injection section 41 and the cut-off section 42; and when the needle valve 5 is pushed out, the needle valve 5 blocks the cut-off section 42, stops feeding, and cuts off the BMC material.

[0041] To further explain, the manifold 32 is provided with a first channel 321 communicating with the flow channel insert 31 and a second channel 322 communicating with the bottom of the nozzle 4; the first channel 321 and the second channel 322 form a T-shaped channel, and a cold material well 323 is provided at the end of the first channel 321.

[0042] The BMC material flowing in from the first channel 321 is divided at the second channel 322 and enters the nozzles 4 on both sides from the bottom respectively, which is simple and easy. A cold material well 323 is set at the end of the first channel 321 to collect solidified waste materials to prevent the waste materials from clogging the nozzles 4.

[0043] To further explain, the outer wall of the nozzle 4 is divided into a base 35, a first outer wall section 36 and a second outer wall section 37; the first outer wall section 36, the second outer wall section 37 and the base 35 form a step-by-step structure; the first outer wall section 36 is arranged in the lower mold plate 2, the second outer wall section 37 is arranged in the lower model cavity 02, and the base 35 is arranged in the flow channel plate 3.

[0044] When the needle valve 5 cuts off the BMC material in the nozzle 4, a greater force is required due to the poor fluidity of the BMC material itself. The first outer wall section 36 is arranged in the lower template 2, and the second outer wall section 37 is arranged in the lower mold cavity 02, forming a step-shaped limiting structure, which provides the nozzle 4 with sufficient supporting force to support the force of the needle valve 5 to push upward.

[0045] To further explain, the water cooling gap 34 is arranged on the outer side of the second outer wall section 37 .

[0046] The water cooling gap 34 is arranged outside the second outer wall section 37 to fully cool the needle valve 5, thereby ensuring that the BMC material in the nozzle 4 will not cool down during the time interval between two injection molding processes, thereby ensuring that the injection mold can work continuously and stably.

[0047] The working process of the whole set of equipment is as follows:

[0048] Step 1: The mold 0032 is opened, the lower mold slides out through the slide plate 033a, and the aluminum alloy parts and nuts of the composite door pedal 03 are placed in the lower mold cavity 02. The slide plate 033a sends the lower mold back to the center of the slide body 033b for mold closing;

[0049] Step 2: Put the BMC raw material into the hopper 0023, and the second oil cylinder 0021 pushes the piston 0022 to press the raw material into the barrel 0024. The barrel 0024 is equipped with a screw 0025 driven to rotate by an external power motor. Under the action of the screw 0025, the raw material is injected into the nozzle 4 in the mold 0032 through the nozzle at high speed and high pressure;

[0050] Step 3: Select the gate diameter according to the product volume The BMC raw material is pressed into the nozzle 4 through the screw 0025. The nozzle 4 maintains the flow channel temperature at 30°C-70°C under the water cooling effect of the water cooling gap 34. The needle valve 5 in the middle of the nozzle 4 retreats, and the BMC raw material is injected into the mold cavity through the gate. Under the push of the needle valve plate 6, the needle valve 5 moves forward, and the needle valve 5 blocks the flow channel of the glue inlet. The top of the needle valve 5 reaches the surface of the product, cutting off the flow channel of the nozzle 4 and the material level of the cavity. The BMC raw material is thermally cured and formed in the mold cavity at 135°C-185°C.

[0051] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The content of this specification should not be understood as limiting the present invention.

Claims

1. A composite door pedal BMC injection molding machine, characterized by: It comprises a frame, a feeding part and a forming part; the forming part comprises a first oil cylinder, a mold and a sliding device; the mold is arranged on the sliding device, the first oil cylinder drives the sliding device to open and close the mold, and the sliding device drives the mold to move horizontally; the feeding part supplies raw materials into the mold; The sliding device comprises a slide plate and a slide body, the slide plate moves on the guide rail of the slide body, the slide plate performs injection molding at the middle station of the slide body, and the slide plate places or removes the molds on both sides of the slide body to realize alternating injection molding of the two molds; The mold comprises an upper mold plate, a lower mold plate, a flow channel plate, a nozzle, a needle valve and a needle valve plate; An upper mold cavity and a lower mold cavity are provided between the upper mold plate and the lower mold plate; A needle valve is provided in the nozzle, and the needle valve is connected to the needle valve plate; A flow channel insert and a diverter plate are arranged in the flow channel plate; the flow channel insert and a plurality of nozzles are connected through the diverter plate; a water cooling channel is arranged in the flow channel plate, a water cooling gap is arranged between the lower template and the nozzle, and the water cooling gap is connected with the water cooling channel to form a water cooling circuit; A plurality of composite door pedals are arranged between the upper mold cavity and the lower mold cavity, and the composite door pedals correspond to the position of the nozzle; when the injection molding stops, the needle valve pushes against the surface of the composite door pedal, cutting off the flow channel inside the nozzle to continue the material flow; the length of the flow channel insert is adapted to the length of the composite door pedal, so that the nozzle performs injection molding from the middle part of the composite door pedal; The nozzle includes an injection section and a cut-off section, a gap is formed between the injection section and the needle valve to form an injection channel, and the inner diameter of the cut-off section is consistent with the outer diameter of the needle valve; The outer wall of the nozzle is divided into a base, a first outer wall section and a second outer wall section; the first outer wall section, the second outer wall section and the base form a step-by-step structure; the first outer wall section is arranged in the lower mold plate, the second outer wall section is arranged in the lower mold cavity, and the base is arranged in the flow channel plate; The water cooling gap is arranged on the outer side of the second outer wall section.

2. A composite door pedal BMC injection molding machine according to claim 1, characterized in that: The feeding part includes a second oil cylinder, a piston, a hopper, a barrel and a screw; the second oil cylinder drives the piston to move in the hopper, and the screw in the barrel injects the raw material in the hopper into the mold through the screw.

3. The composite door pedal BMC injection molding machine according to claim 1, characterized in that: The diverter plate is provided with a first channel connected to the flow channel insert and a second channel connected to the bottom of the nozzle; the first channel and the second channel form a T-shaped channel, and a cold material well is provided at the end of the first channel.

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