Part batch injection molding device and injection molding process thereof

Abstract

The invention discloses a part batch injection molding device and an injection molding process thereof, and relates to the technical field of injection molding, the part batch injection molding device comprises an injection mold, the injection mold comprises a movable mold, a fixed mold and a stripping mechanism, the movable mold is provided with a plurality of mold cores, the fixed mold is provided with mold cavities matched with the mold cores, and a plurality of injection molding cavities are formed after the movable mold and the fixed mold are closed; a cutting mechanism is arranged on the surface of a movable mold plate of the movable mold and comprises a cutter part and a transmission part, and the cutter part comprises a sliding groove, a sliding block, a sliding base and a self-adaptive cutter. The problems that in the prior art, in the demolding process, connection between a waste rod and a formed product needs to be separated through manpower or special equipment subsequently, the complexity of the production process is increased, and the labor cost is increased are solved. The die has the advantages that the cutting process is embedded into the demolding action through the cutting design of the internal structure of the die, and in-die cutting is achieved, so that the production process is simplified, and the comprehensive cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of injection molding, and particularly relates to a component batch injection molding device and an injection molding process thereof. Background Art

[0002] Injection molding is to use a plastic molding die to make various shaped plastic products from thermoplastic or thermosetting materials. Injection molding is achieved through an injection molding machine and a die.

[0003] In the prior art, in the injection molding process, the die is the core equipment for mass production of plastic products. After the product is molded by a traditional injection mold, a waste rod (commonly known as "gate") connected to the product is usually formed in the gate area. Its function is to guide the molten plastic to fill the cavity. However, during the demolding process, the connection between the waste rod and the molded product needs to be separated subsequently by manual or special equipment (such as a gate cutting machine). This process increases the complexity of the production process and also leads to an increase in labor costs, requiring the provision of special equipment or labor.

[0004] To solve the above technical problems, the present invention discloses a component batch injection molding device and an injection molding process thereof. The present invention has the advantages of embedding the cutting process into the demolding action through the cutting design of the internal structure of the die, realizing in-die cutting, thereby simplifying the production process and reducing the comprehensive cost. Summary of the Invention

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a component batch injection molding device and an injection molding process thereof, so as to solve the technical problems in the prior art that during the demolding process, the connection between the waste rod and the molded product needs to be separated subsequently by manual or special equipment, which increases the complexity of the production process and also leads to an increase in labor costs. The present invention has the advantages of embedding the cutting process into the demolding action through the cutting design of the internal structure of the die, realizing in-die cutting, thereby simplifying the production process and reducing the comprehensive cost.

[0006] The present invention is realized through the following technical solutions: The present invention discloses a component batch injection molding device, including an injection mold, the injection mold includes a movable mold, a fixed mold and a stripping mechanism. A plurality of cores are provided on the movable mold, and cavities matching the cores are provided on the fixed mold. After the movable mold and the fixed mold are closed, a plurality of injection cavities are formed; A cutting mechanism is arranged on the surface of the movable template of the movable mold, and the cutting mechanism includes a cutter part and a transmission part; The cutter part includes a chute, a slider, a sliding seat and an adaptive cutter. The chute is opened on the surface of the movable template. The slider slides in the chute and is fixedly connected to the sliding seat. The adaptive cutter is fixed to the sliding seat, and the distance between its bottom surface and the surface of the movable template is greater than the height of the gate waste rod, and the adaptive cutter can float horizontally to compensate for the product shrinkage deviation; The transmission part includes a trigger and a driver. The trigger is fixed on the reference plane of the ejection system of the injection molding machine. It includes a wedge block. The driver includes a connecting rod and a spring. One end of the connecting rod is connected to the slider, and the other end drives the adaptive cutting tool to move through the guiding of the inclined surface of the wedge block. The spring is used to reset the connecting rod.

[0007] Furthermore, the adaptive cutting tool includes a tool rod, a floating block and a blade. The tool rod is fixed on the sliding seat. There is a notch at the end of the tool rod. The floating block is movably arranged in the notch through an elastic member and floats along the direction perpendicular to the feeding direction of the tool rod. The front end surface of the floating block is an arc surface matching the outer circumference of the knob. The blade is fixed on the bottom surface of the floating block and the bottom surface of the blade fits the surface of the moving template.

[0008] Furthermore, the inclined surface of the wedge block is divided into two sections, including a fast approaching section and a decelerating cutting section. The inclined surface angle of the fast approaching section is greater than that of the decelerating cutting section, and the two inclined surfaces are transitioned through a smooth curved surface.

[0009] Furthermore, a sliding rod and an elastic member are arranged between the floating block and the inner wall of the notch. The sliding rod slides through the tool rod to limit the movement of the floating block, and the elastic member is used to elastically support the floating block.

[0010] Furthermore, the trigger also includes a fixing rod. One end of the fixing rod is fixed on the reference plane of the ejection system of the injection molding machine, and the wedge block is fixed at one end of the fixing rod.

[0011] Furthermore, the stripping mechanism includes a ejector pin, a push plate and a ejector post. The ejector pin is movably inserted into the core and is linked through the push plate. The ejector post is mechanically limited and matched with the ejector rod of the injection molding machine, and the triggering stroke of the ejector post is later than the contact stroke between the wedge block and the connecting rod.

[0012] Furthermore, a relief groove corresponding to the position of the adaptive cutting tool is provided on the surface of the fixed template of the fixed mold.

[0013] Furthermore, the inclined surface of the wedge block is treated with hard chromium plating, and one end of the connecting rod in contact with the wedge block is a spherical structure.

[0014] An injection molding process for a parts batch injection molding device includes the following steps: Step 1: After the mold is closed, the molten plastic is injected into the cavity through the main runner and the sub-runners, and is cooled to form the product and the waste rod; Step 2: The moving mold moves to open the mold, and the waste rod is separated from the fixed mold and retreats with the moving mold; Step 3: The connecting rod contacts the inclined surface of the trigger and drives the adaptive cutting tool to move horizontally to cut off the waste rod; Step 4: The ejector post contacts the ejector rod, and the push plate pushes the ejector pin to eject the product to complete the stripping.

[0015] The present invention has the following advantages: (1) In the present invention, a cutting mechanism is integrated into the moving template, and the opening mold action is used to trigger the lateral movement of the cutting tool, so that all waste rods at the core can be synchronously cut before demolding, eliminating the subsequent independent steps of manual or equipment cutting in the traditional process. Moreover, through the contact between the connecting rod and the inclined plane of the wedge block when the moving mold retreats, the linear motion of the mold is converted into the lateral movement of the cutting tool, realizing pure mechanical drive without the need for additional hydraulic or electric devices, reducing energy consumption and system complexity.

[0016] (2) In the present invention, an adaptive cutting tool is set. By setting a floating block and laterally floating it through an elastic member, the deviation of the outer diameter of the knob being too large or too small due to cooling shrinkage is compensated, enabling the blade to accurately align with the root of the waste rod.

[0017] (3) In the present invention, the inclined plane of the wedge block is set in two sections, so that the cutting tool can decelerate when approaching the waste rod, and then cut the waste rod at a reduced speed. The low-speed cutting can prevent the waste rod from being torn or chipped due to instantaneous impact force, ensure a flat cutting surface, and reduce the instantaneous impact load on the cutting edge to avoid chipping or curling of the cutting edge. Description of the Drawings

[0018] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the structure of the moving mold of the present invention; Figure 3 is a schematic diagram of the structure of the fixed mold of the present invention; Figure 4 is a schematic cross-sectional view of the injection mold of the present invention; Figure 5 is a schematic diagram of the structure of the injection molding machine of the present invention; Figure 6 is the present invention Figure 5 is a partially enlarged schematic diagram of part A of the present invention; Figure 7 is the present invention Figure 2 is a partially enlarged schematic diagram of part D of the present invention; Figure 8 is the present invention Figure 2 is a partially enlarged schematic diagram of part B of the present invention; Figure 9 is the present invention Figure 3 is a partially enlarged schematic diagram of part E of the present invention; Figure 10 is the present invention Figure 2 is a partially enlarged schematic diagram of part C of the present invention; Figure 11 is a schematic diagram of the product structure of the present invention; Figure 12 is a schematic diagram of the structure of the driving member of the present invention; Figure 13For the present invention Figure 7 Schematic diagram of the partial enlarged structure at position F of the present invention; Figure 14 Schematic diagram of the floating block structure of the present invention.

[0019] In the figure: 1, injection mold; 2, injection molding machine; 3, moving die moving plate; 4, ejecting system reference plane; 5, relief hole; 6, through hole; 7, guide pillar; 8, cutting mechanism; 9, gate waste rod; 10, side gate; 11, slot; 12, insert block; 13, relief groove; 14, ejector rod; 15, slide bar; 16, notch; 101, moving die; 102, fixed die; 103, core; 104, cavity; 105, main runner; 106, sub - runner; 107, center hole; 108, stripping mechanism; 111, moving template; 112, mold feet; 113, moving die bottom plate; 114, ejector pin; 121, fixed template; 181, push plate; 182, ejector rod; 801, cutter part; 802, transmission part; 811, chute; 812, slider seat; 813, adaptive cutter; 814, slider; 821, trigger part; 822, driving part; 8221, connecting seat; 8222, positioning block; 8223, connecting rod; 8224, limiting plate; 8225, spring; 8211, fixed rod; 8212, wedge block; 8131, tool bar; 8132, floating block; 8133, blade; 2121, rapid approach section; 2122, deceleration cutting section. Detailed implementation manners

[0020] The following details the embodiments of the present invention. These embodiments are implemented on the premise of the technical solution of the present invention, and provide detailed implementation methods and specific operation processes. However, the protection scope of the present invention is not limited to the following embodiments. In the description of the present invention, words indicating orientation or position relationship such as "front", "rear", "left", "right", etc. are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present invention.

[0021] The embodiment discloses a device for batch injection molding of parts, as Figures 1 - 14 shown, including an injection mold 1. Among them, as Figures 2 - 4 shown, the injection mold 1 includes a moving die 101 and a fixed die 102. A protruding core 103 is provided on the moving die 101, and a cavity 104 is provided on the fixed die 102; It should be noted that multiple cavities 104 and cores 103 are respectively provided, so that there are multiple cavities on one mold. After one injection molding operation, multiple products can be completed.

[0022] After the moving mold 101 and the stationary mold 102 are closed, the core 103 is inside the cavity 104 to form an injection cavity. In addition, a main runner 105 is provided on the stationary mold 102. The main runner 105 is used to connect the nozzle of the molding machine to the mold runner. On the stationary mold 102, the main runner 105 is respectively connected to each cavity 104 through a sub-runner 106. Correspondingly, a central hole 107 matching the main runner 105 of the stationary mold 102 is also provided at the center of the moving mold 101. The central hole 107 is also connected to each core 103 through a sub-runner 106. Thus, after the moving mold 101 and the stationary mold 102 are closed, fluid enters at the main runner 105, and the fluid can enter each cavity 104 through the sub-runner 106 respectively. Then, it is cooled by the cooling medium in the internal cooling channels of the mold, so that the fluid inside the cavity 104 solidifies to carry out the injection work.

[0023] It should be noted that for the convenience of description, the plates of the moving mold 101 and the stationary mold 102 facing each other are respectively the moving template 111 and the stationary template 121. In addition, the injection mold 1 further includes a stripping mechanism 108; As Figure 2 and Figure 4 shown, the stripping mechanism 108 includes an ejector pin 182 and a push plate 181. Among them, an ejector pin 182 is movably inserted inside the core 103. Two mold feet 112 are provided below the moving template 111, and a moving mold bottom plate 113 is fixedly provided below the mold feet 112. One end of the ejector pin 182 passes through the moving template 111 and extends between the two mold feet 112. The push plate 181 is movably arranged between the two mold feet 112, and the push plate 181 is located between the moving template 111 and the moving mold bottom plate 113. One end of the ejector pin 182 between the two mold feet 112 is connected to the push plate 181. On the other side of the push plate 181, an ejector post 114 is fixedly provided, and the ejector post 114 extends below the moving mold bottom plate 113 through a through hole 6 in the moving mold bottom plate 113. The ejector post 114 is movably inserted and matched with the through hole 6 of the moving mold bottom plate 113; In addition, a guide post 7 is fixedly provided above the push plate. The guide post 7 passes through the moving template 111 to limit the movement of the push plate 181 and the ejector pin 182. A spring is sleeved outside the guide post 7 for the reset of the push plate 181.

[0024] Through the above settings, after the injection is completed, the moving mold 101 moves. The movement of the moving mold 101 is mechanically and limit-contacted with the ejector rod 14 of the molding machine through the ejector post 114, so that the push plate 181 is moved towards the moving template 111 direction, and the ejector pin 182 is pushed out, thereby ejecting the product on the core 103.

[0025] And considering that when multiple products are injected, such as Figure 11As shown, a gate waste rod 9 connected to the product is formed in the gate area of the runner 106. After the product is ejected, a subsequent dedicated process is required to cut the waste rod, which increases the complexity of the production process and also results in an increase in labor costs. Special equipment or labor needs to be equipped. To simplify the process, in this embodiment, as Figure 2 shown, a cutting mechanism 8 is provided at the moving template 111. Each time the moving die moves, the waste rod can be cut once by the cutting mechanism 8.

[0026] It should be noted that, in this embodiment, as Figure 2 、 Figure 3 and Figure 9 shown, the side gate 10 of the runner 106 is located on the fixed die, and the side gate 10 is set in an arch shape, and the bottom surface of the side gate 10 on the fixed die is open. Specifically, the upper part of the side gate 10 is semi-circular and the bottom is rectangular. When the moving die 101 and the fixed die 102 are closed, the runners 106 on the moving template 111 and the fixed template 121 overlap to form a circular cross-section channel, and the bottom opening of the side gate 10 is blocked by the surface of the moving template 111. Thus, after the gate waste rod 9 solidifies, as Figure 11 shown, the bottom surface of the gate waste rod 9 is flat and is on the surface of the moving template 111, and the bottom surface of the cutter of the cutting mechanism 8 fits the surface of the moving template 111. The cutter of the cutting mechanism 8 translates to cut the gate waste rod 9.

[0027] Specifically, the cutting mechanism 8 includes a cutter part 801 and a transmission part 802. Among them, the cutter part 801 is arranged on the surface of the moving template 111. It should be noted that each core 103 corresponds to a cutter part 801, so that the gate waste rod 9 at each core 103 can be cut. In order to prevent the cutter part 801 from affecting the molding of the product, the cutter part 801 is arranged outside the coverage of the cavity 104. In other words, after the moving die 101 and the fixed die 102 are closed, the cutter part 801 is outside the cavity 104. After the mold is opened later, when the moving die moves, through the transmission of the transmission part 802, the movement of the moving die drives the cutter part 801 to move, so that the cutter part 801 moves to the position of the core 103 to cut the waste rod.

[0028] More specifically, as Figure 2 、 Figure 7 and Figure 10As shown in the figure, the cutting tool part 801 includes a chute 811, a slider 814, a sliding seat 812, and an adaptive cutting tool 813. Among them, the chute 811 is opened on the upper end surface of the moving template 111. The chute 811 is specifically set to have a convex-shaped cross-section, and the length direction of the chute 811 is perpendicular to the length direction of the gate of the runner 106. A slider 814 is slidably inserted into the chute 811. The slider 814 is also convex-shaped. A sliding seat 812 is fixed on the upper end surface of the slider 814. The lower end surface of the sliding seat 812 is in sliding fit with the upper end surface of the moving template 111. An adaptive cutting tool 813 is connected to the sliding seat 812, and the cutting edge end of the adaptive cutting tool 813 faces the gate direction. The bottom surface of the blade of the adaptive cutting tool 813 is in contact with and slidably fits with the upper end surface of the moving template 111.

[0029] During use, as Figure 1 and Figure 5 shown, the injection mold 1 is installed on the injection molding machine 2. The moving mold 101 is fixed to the moving mold moving plate 3 of the injection molding machine 2. Then, the hydraulic system of the injection molding machine 2 controls the movement of the moving mold moving plate 3, so that the moving mold 101 moves to be clamped with the fixed mold 102 for injection molding work. A relief hole 5 for the ejector pin 114 is opened on the moving mold moving plate 3. The ejector rod 14 is fixed to the injection molding machine 2. When the moving mold 101 opens, after the moving mold 101 moves, the ejector pin 114 can contact the ejector rod 14, and then the push plate 181 moves to perform demolding.

[0030] Specifically, as Figure 2 、 Figure 6 、 Figure 7 and Figure 8 shown, the transmission part 802 includes a trigger part 821 and a driving part 822. Among them, the trigger part 821 is connected to the injection molding machine 2, and the trigger part 821 is located outside the moving mold 101. The driving part 822 is arranged on the side of the moving template 111. The slider 814 is connected to the driving part 822. When the moving mold 101 moves to open, the movement of the moving mold 101 causes the driving part 822 to contact the trigger part 821, and then the slider 814 moves, controlling the sliding seat 812 and the adaptive cutting tool 813 to move towards the waste rod direction to cut the waste rod.

[0031] It should be noted that the number of the transmission part 802 is the same as that of the cutting tool part 801, and each cutting tool part 801 corresponds to a transmission part 802; As Figure 2 、 Figure 8 、 Figure 10 and Figure 12As shown, the driving member 822 includes a connecting seat 8221, a positioning block 8222, a connecting rod 8223, a limiting plate 8224 and a spring 8225, wherein the connecting seat 8221 is fixedly arranged on the side wall of the movable template 111, and the connecting seat 8221 is arranged in an L shape, the outer wall of the connecting seat 8221 is fixedly provided with a positioning block 8222, the inner part of the positioning block 8222 is slidably inserted with a connecting rod 8223, and the connecting rod 8223 is in the same position as the slider 814 of the corresponding cutting portion 801. On an axis, one end of the connecting rod 8223 moves through the interior of the movable template 111 and extends to the corresponding slide groove 811, and the end of the connecting rod 8223 located in the slide groove 811 is fixedly connected to the slider 814, and the other end of the connecting rod 8223 is fixedly sleeved on the limiting plate 8224. A spring 8225 is also arranged between the limiting plate 8224 and the positioning block 8222. The spring 8225 is sleeved on the outside of the connecting rod 8223, and the spring 8225 is used to reset the connecting rod 8223.

[0032] Furthermore, when the spring 8225 is in a released state, the distance between the limit plate 8224 and the positioning block 8222 is relatively large, and the adaptive cutter 813 is in a position away from the core 103. When the limit plate 8224 moves toward the positioning block 8222, the spring 8225 is compressed, and the limit plate 8224 and the connecting rod 8223 move synchronously, so that the slider 814 moves synchronously, and then controls the slide 812 to drive the adaptive cutter 813 to move toward the direction of the knob waste rod, so that the adaptive cutter 813 cuts off the gate waste rod 9.

[0033] In addition, in order to make the movement of the connecting rod 8223 more stable, an insert block 12 and a slot 11 are arranged between the limit plate 8224 and the connecting seat 8221, and the insert block 12 and the slot 11 are arranged in a dovetail shape. The insert block 12 is fixed to the outer wall of the limit plate 8224, and the slot 11 is opened on the end face of the connecting seat 8221. The insert block 12 is slidably inserted into the slot 11, thereby limiting the movement of the limit plate 8224.

[0034] Since the cutter portion 801 is disposed on the surface of the movable template 111, in order to make way for the cutter portion 801, as shown in FIG. Figure 3 and Figure 9 As shown, a clearance groove 13 for making way for the cutter part 801 is opened on the surface of the fixed mold plate 121 of the fixed mold 102.

[0035] like Figure 1 , Figure 2 , Figure 5 , Figure 6 , Figure 8As shown, the trigger member 821 includes a fixed rod 8211 and a wedge 8212, wherein the fixed rod 8211 is fixed on the injection molding machine 2. For the convenience of description, in this embodiment, the side of the injection molding machine 2 on which the ejector rod 14 is fixed is named the ejector system reference plane 4. One end of the fixed rod 8211 is fixed to the ejector system reference plane 4 of the injection molding machine 2, the same as the ejector rod 14, and the other end of the fixed rod 8211 is fixedly provided with a wedge 8212, and the wedge 8212 is located on one side of the movable mold 101, and the end surface of the wedge 8212 facing the movable mold 101 is an inclined surface, and its surface is hard chrome plated or TD treated. In order to improve the wear resistance, the specific setting of the inclined surface is that when the movable mold 101 moves through the mold opening movement, that is, when the movable mold 101 moves toward the ejection system reference plane 4 of the injection molding machine 2, the movable mold 101 moves and drives the connecting rod 8223 of the side wall to move synchronously, so that the connecting rod 8223 contacts the inclined surface of the wedge block 8212, and through the guidance of the inclined surface, the connecting rod 8223 compresses the spring 8225 to move in a direction perpendicular to the moving direction of the movable mold 101, and then controls the slider 814 to drive the slide seat 812 and the adaptive cutter 813 to move toward the direction of the waste rod, so as to cut the waste rod.

[0036] It should be noted that the end of the connecting rod 8223 in contact with the wedge block 8212 is set to a spherical surface. In addition, the position of the wedge block 8212 is specifically set to be such that when the movable mold 101 and the fixed mold 102 are molded together, there is a gap between the wedge block 8212 and one end of the connecting rod 8223. In other words, when the movable mold 101 moves to open the mold, the connecting rod 8223 will contact the wedge block 8212 only after the movable mold 101 moves a certain stroke, so that after the waste rod inside the main channel 105 is separated from the fixed mold 102, the adaptive cutter 813 performs the cutting work again, thereby ensuring that the product is tightly held on the core 103 by shrinkage, and the runner waste rod can be attached to the movable mold 101. When the movable mold 101 moves, the main channel 105 waste rod can be separated from the fixed mold 102; It should also be noted that after the injection molding of the movable mold 101 and the fixed mold 102 is completed, during the process of the movable mold 101 opening and moving, the main channel waste rod and the fixed mold 102 are first separated, and then the wedge block 8212 contacts the connecting rod 8223 to cut off the gate waste rod 9. After the cutting is completed, the ejector rod 14 contacts the ejector column 114, so that the ejector rod 182 is ejected to remove the product.

[0037] In this embodiment, if Figure 6 and Figure 8As shown, the inclined surface of the wedge block 8212 is also set to two sections, namely a fast approach section 2121 and a deceleration cutting section 2122, and the two inclined surfaces are transitioned through a smooth surface. By setting the two inclined surfaces, the feeding speed of the adaptive cutter 813 is controlled, so that without relying on external sensors or an electronic control system, the feeding speed of the cutter is optimized through a pure mechanical structure.

[0038] Specifically, the fast approach section 2121 is set above. In other words, when the connecting rod 8223 contacts the inclined surface of the wedge block 8212 during the opening movement of the moving die 101, it first contacts the fast approach section 2121. The inclined surface angle of the fast approach section 2121 is relatively large, so that the movement of the adaptive cutter 813 is relatively fast. The deceleration cutting section 2122 is located below, and the inclined surface angle of the deceleration cutting section 2122 is smaller than that of the fast approach section 2121, so that the cutter can decelerate when approaching the waste rod, and then decelerate to cut the waste rod. The low-speed cutting can prevent the waste rod from being torn or chipped due to instantaneous impact force, ensure the smoothness of the cutting surface, and reduce the instantaneous impact load on the cutting edge to avoid chipping or curling of the cutting edge.

[0039] In addition, it should be considered that after the knob injection molding is completed, due to the difference in the cooling shrinkage rate of the injection molded parts during cooling shrinkage, the outer diameter of the knob may be too large. In this case, if the fixed movement trajectory is set when the adaptive cutter 813 moves laterally, it will scratch the product surface. When the outer diameter of the knob is too small, there will be a situation where the gate waste rod 9 is not completely cut off and burrs remain. Therefore, in this embodiment, the cutting head of the adaptive cutter 813 is set to be floating, so that the cutting surface of the adaptive cutter 813 can be adjusted according to the change of the outer wall of the knob.

[0040] Specifically, as Figure 2 、 Figure 7 、 Figure 13 and Figure 14 shown, the adaptive cutter 813 includes a tool bar 8131, a floating block 8132, and a blade 8133. One end of the tool bar 8131 is fixed to the slide base 812 by screws. A notch 16 is provided at the end of the tool bar 8131 along its width direction. A floating block 8132 is arranged inside the notch 16. The front end surface of the floating block 8132 is in the same plane as the front end surface of the tool bar 8131, and the side surface of the floating block 8132 is also in the same plane as the side wall of the tool bar 8131. In addition, the floating block 8132 has a moving space for moving along the width direction of the tool bar 8131 inside the notch 16. In other words, the width and length of the floating block 8132 are both smaller than the width and length of the notch 16, so that the floating block 8132 can move along the direction perpendicular to the feeding direction of the tool bar 8131; It should also be noted that a slide bar 15 is fixed to the side wall of the floating block 8132. The other end of the slide bar 15 slides through the tool bar 8131, thereby limiting the movement of the floating block 8132. An elastic member is further provided between the floating block 8132 and the inner wall of the notch 16, thereby elastically resetting and supporting the movement of the floating block 8132 through the elastic member. The outer side wall of the end of the floating block 8132 is set as an arc surface, that is, the edge of the end of the floating block 8132 facing the corresponding knob waste rod and the side edge facing the knob direction is an arc surface. When the tool bar 8131 feeds and moves, the first part in contact with the outer circumferential outer wall of the knob is the arc surface part of the floating block 8132, and the arc surface part of the floating block 8132 will not be able to cut the outer wall of the knob. Through the continuous linear feed of the tool bar 8131, the floating block 8132 will contract towards the inside of the notch 16 under the guidance of the outer circumferential outer wall of the knob, so that the side of the floating block 8132 facing the knob is always in contact with its outer circumferential outer wall, thereby ensuring that the side of the floating block 8132 fits the outer wall of the knob; The bottom surface of the floating block 8132 and the bottom surface of the tool bar 8131 are in the same plane, and both are above the surface of the moving template 111. The distance between the bottom surfaces of the floating block 8132 and the tool bar 8131 and the surface of the moving template 111 is greater than the height of the gate waste rod 9, that is, the floating block 8132 is above the gate waste rod 9, as Figure 11 shown. The height of the circular part of the knob is higher than that of the gate waste rod 9. Therefore, when the floating block 8132 contacts the outer circumferential outer wall of the knob, it is above the waste rod, as Figure 2 、 Figure 7 、 Figure 13 and Figure 14 shown. A blade 8133 is fixed to the bottom surface of the floating block 8132, and the bottom surface of the blade 8133 is in contact with the surface of the moving template 111. The side of the blade 8133 facing the knob direction is in the same plane as the side of the floating block 8132. Therefore, when the floating block 8132 moves, after the floating block 8132 fits the outer circumferential outer wall of the knob, the side of the blade 8133 is also aligned with the outer circumferential outer wall of the knob, thereby ensuring that the blade 8133 can accurately cut the gate waste rod 9. In addition, the blade 8133 has a distance from the end of the floating block 8132 along the length direction of the floating block 8132, that is, the blade 8133 is away from the end of the floating block 8132 along the length direction of the floating block 8132. In other words, when the tool bar 8131 feeds, the first part in contact with the knob is the end of the floating block 8132, thereby enabling the floating block 8132 to move through the guidance of the outer wall of the knob to adjust the position of the blade 8133, so that the blade 8133 is aligned with the outer wall of the knob. After that, when the side of the floating block 8132 is tangent to the outer wall of the knob, the blade 8133 moves to the gate waste rod 9 and cuts it off.

[0041] Therefore, through the setting of the floating block 8132, for the fluctuations in the cooling and shrinkage of the knob, the position of the blade 8133 is adjusted to ensure that the cutting edge always slides along the tangent direction of the outer wall of the product when cutting the waste rod.

[0042] An injection molding process for a batch injection molding device of parts includes the following steps: Step 1: The moving mold 101 and the fixed mold 102 are closed, and the molten plastic is injected into the cavity 104 through the main runner 105 and the sub-runners 106, and is cooled and solidified to form the product and the waste rod. Step 2: The moving mold 101 is opened and retracted. Since the product shrinks and adheres to the moving mold 101, the waste rod in the main runner 105 is separated from the fixed mold. Step 3: The connecting rod 8223 contacts the inclined surface of the wedge block 8212, compresses the spring 8225 to push the adaptive cutter 813 to move laterally, cuts off the gate waste rod 9. The gate waste rod 9 adheres to the moving mold 101 due to shrinkage, and the adaptive cutter 813 resets after the operation is completed.

[0043] Step 4: The moving mold 101 continues to retract, the ejector pin 114 contacts the ejector rod 14, and the push plate 181 pushes the ejector rod 182 to eject the product.

[0044] For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, from any point of view, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.

Claims

1. A batch injection molding device for parts, including an injection mold (1), the injection mold (1) includes a movable mold (101), a fixed mold (102) and a stripping mechanism (108), a plurality of core pins (103) are provided on the movable mold (101), and a cavity (104) matching the core pins (103) is provided on the fixed mold (102). After the movable mold (101) and the fixed mold (102) are closed, a plurality of injection cavities are formed. It is characterized in that A cutting mechanism (8) is arranged on the surface of the movable template (111) of the movable mold (101), and the cutting mechanism (8) includes a cutter part (801) and a transmission part (802); The cutter part (801) includes a chute (811), a slider (814), a sliding seat (812) and an adaptive cutter (813). The chute (811) is opened on the surface of the movable template (111). The slider (814) is slidably arranged in the chute (811) and fixedly connected to the sliding seat (812). The adaptive cutter (813) is fixed to the sliding seat (812), and the distance between its bottom surface and the surface of the movable template (111) is greater than the height of the gate waste rod (9). And the adaptive cutter (813) can float horizontally to compensate for the product shrinkage deviation; The transmission part (802) includes a trigger part (821) and a driving part (822). The trigger part (821) is fixed on the reference surface (4) of the ejecting system of the injection molding machine (2), and it includes a wedge block (8212). The driving part (822) includes a connecting rod (8223) and a spring (8225). One end of the connecting rod (8223) is connected to the slider (814), and the other end drives the adaptive cutter (813) to move through the inclined surface of the wedge block (8212). The spring (8225) is used for the reset of the connecting rod (8223).

2. The batch injection molding device for parts according to claim 1, characterized in that The adaptive cutter (813) includes a cutter bar (8131), a floating block (8132) and a blade (8133). The cutter bar (8131) is fixed to the sliding seat (812). A notch (16) is provided at the end of the cutter bar (8131). The floating block (8132) is movably arranged in the notch (16) through an elastic member and floats along the feeding direction perpendicular to the cutter bar (8131). The front end surface of the floating block (8132) is an arc surface matching the outer circumference of the knob. The blade (8133) is fixed to the bottom surface of the floating block (8132) and the bottom surface of the blade (8133) is attached to the surface of the movable template (111).

3. An injection molding device for mass-producing parts according to claim 1, characterized in that, The inclined surface of the wedge block (8212) is divided into two sections, including a rapid approach section (2121) and a deceleration cutting section (2122). The inclined surface angle of the rapid approach section (2121) is greater than that of the deceleration cutting section (2122), and the two inclined surfaces are transitioned through a smooth curved surface.

4. The batch injection molding device for parts according to claim 2, wherein A sliding rod (15) and an elastic member are arranged between the floating block (8132) and the inner wall of the notch (16). The sliding rod (15) slidably passes through the cutter bar (8131) to limit the movement of the floating block (8132), and the elastic member is used for elastic support of the floating block (8132).

5. A batch injection molding device for parts as described in claim 1, characterized in that, The trigger member (821) further includes a fixing rod (8211), one end of the fixing rod (8211) is fixed on the ejecting system reference surface (4) of the injection molding machine (2), and the wedge block (8212) is fixed at one end of the fixing rod (8211).

6. The batch injection molding device for parts according to claim 1, characterized in that, The stripping mechanism (108) includes a ejector rod (182), a push plate (181) and a ejector pin (114). The ejector rod (182) is movably inserted into the core (103) and is linked through the push plate (181). The ejector pin (114) is in mechanical limit fit with the ejector rod (14) of the injection molding machine (2), and the contact stroke of the ejector pin (114) is later than the contact stroke of the wedge block (8212) and the connecting rod (8223).

7. An apparatus for batch injection molding of parts as claimed in claim 1, wherein, A relief groove (13) corresponding to the position of the adaptive cutter (813) is provided on the surface of the fixed template (121) of the fixed mold (102).

8. An injection molding device for mass-producing parts according to claim 1, characterized in that, The inclined surface of the wedge block (8212) is surface-treated with hard chromium plating, and one end of the connecting rod (8223) in contact with the wedge block (8212) is a spherical structure.

9. The injection molding process of a component batch injection molding device according to any one of claims 1-8, characterized in that, It includes the following steps: Step 1: After the mold is closed, the molten plastic is injected into the cavity (104) through the main runner (105) and the sub-runners (106), and is cooled to form a product and a waste rod. Step 2: The moving mold (101) moves during mold opening, the waste rod is separated from the fixed mold (102) and retreats with the moving mold (101). Step 3: The connecting rod (8223) contacts the inclined surface of the trigger member (821), driving the adaptive cutter (813) to move laterally to cut off the waste rod. Step 4: The ejector pin (114) contacts the ejector rod (14), and the push plate (181) pushes the ejector rod (182) to eject the product, completing the stripping.

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