Injection mold for converting hot runner into cold runner for steering shaft spline

Abstract

The utility model discloses a steering shaft spline hot runner-to-cold runner injection mold, and belongs to the technical field of automobile steering column molding. The mold comprises an upper mold part and a lower mold part, the upper mold part comprises an upper mold plate and an open type single-nozzle hot runner system, the open type single-nozzle hot runner system is arranged on a mounting hole position of the upper mold plate, and the lower mold part comprises a lower mold plate, a cavity sliding block, a mold opening mechanism, a limiting mechanism, an ejector pin mechanism, a lower mold base and mold feet. The mold cavity sliding block is arranged on the mold opening mechanism, a lower mold insert is arranged between the mold cavity sliding block and the limiting mechanism on the lower mold plate, an upper mold insert is arranged at the position, corresponding to the lower mold insert, below the upper mold plate, and the upper mold insert and the lower mold insert are correspondingly provided with semi-cylindrical sub-runners and can be combined into a cylindrical runner; a sprue is arranged beside the semi-cylindrical runner on the lower die plate; and the ejector pin mechanism is positioned on the lower die holder and partially penetrates through the lower die insert. According to the utility model, the waste loss can be reduced, the spline of the steering shaft can be easily formed, and the sliding fit is flawless.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the automobile steering column plastic mould technical field, concretely relates to a kind of steering axle spline hot runner turns cold runner injection mold. BACKGROUND

[0002] The existing automobile steering column steering axle is generally composed of sliding pair, steering upper shaft sleeve is 16-tooth involute inner spline, steering lower shaft outer surface is nylon injection 16-tooth involute outer spline, injection material is PA11, inside is metal 16-tooth outer spline, the outer spline surface of axle and the inner spline surface of axle sleeve form sliding pair, can carry out torque transmission and telescopic slip.

[0003] Conventional steering axle injection mold adopts cold runner side gate, and molten plastic enters from gate sleeve, passes through shunt, side gate enters the mold cavity where slider is, cools after mold opening, and oil cylinder pull rod pulls slider where cavity is, and 16-tooth nylon spline outside steering lower shaft is injected with a layer of PA11 to form product, at this time, the flow channel of mold is left with heavy flow channel waste after cooling and solidification, since PA11 material is expensive, and product requirement cannot use PA11 recycled material, leading to obvious material waste. UTILITY MODEL CONTENTS

[0004] The utility model is just for the above problem, make up the deficiency of prior art, provide a kind of steering axle spline hot runner turns cold runner injection mold;The utility model can not only reduce waste loss, but also ensure that steering axle spline is easily formed, and sliding fit has no defect.

[0005] To achieve the above object, the utility model adopts the following technical scheme.

[0006] The utility model provides a kind of steering shaft spline hot runner transfer cold runner injection mold, including upper die part and lower die part, it is characterized in that, the upper die part includes upper plate and open single nozzle hot runner system, the open single nozzle hot runner system is set on the mounting hole of the upper plate and is communicated to the lower side of the upper plate, the lower die part includes lower plate, cavity slider, mold opening mechanism, limiting mechanism, ejector pin mechanism, lower die holder, die foot, the cavity slider is set on the mold opening mechanism, the mold opening mechanism is connected in the side of the lower plate, the limiting mechanism is connected in the other side of the lower plate, lower die insert is set between the cavity slider and the limiting mechanism on the lower plate, upper die insert is set in the lower side of the lower die insert position of the upper plate, the upper die insert and the lower die insert correspondingly all be provided with semicircular cylinder distributor and can synthesize one cylindrical runner, the cylindrical runner is communicated with the cavity slider inside, gate is set on the semicircular cylinder distributor side on the lower plate and is communicated with the cylindrical runner, the gate corresponds with the lower side of the open single nozzle hot runner system, the lower plate is supported on the upper side of the lower die holder by the die foot of two sides of bottom, the ejector pin mechanism is located on the lower die holder and partially passes through the lower die insert, the lower die holder is provided with through hole in the position corresponding to the ejector pin mechanism.

[0007] Further, the open single nozzle hot runner system includes open hot nozzle, heating wire group, panel, positioning ring, hot runner junction box, the open hot nozzle is connected in the mounting hole of the upper plate and is communicated to the lower side of the upper plate, the heating wire group is connected with the open hot nozzle, the panel is located above the open hot nozzle, the positioning ring passes through the middle part of the panel and fixes the open hot nozzle by pressing, the upper surface of the panel is provided with wiring slot, and the heating wire group is connected with the hot runner junction box by passing out from the wiring slot, and the hot runner junction box is connected on the upper plate.

[0008] Further, the mold opening mechanism includes slider seat, oil cylinder fixed plate, mold opening oil cylinder, the cylinder body of the mold opening oil cylinder is connected to the side of the lower plate by the oil cylinder fixed plate, the oil cylinder telescopic mandrel of the mold opening oil cylinder is connected with the slider seat, and the cavity slider is arranged on the slider seat.

[0009] Further, the limiting mechanism includes end limiting plate, connecting shaft and baffle, the end limiting plate is connected on one side of the lower plate by connecting shaft, the baffle is arranged on the connecting shaft, and workpiece groove is formed in the baffle.

[0010] Further, guide sleeve is arranged on the upper plate, guide column is arranged on the lower plate corresponding to the guide sleeve, the guide column can be inserted into the guide sleeve, so that the upper plate and the lower plate are positioned in clamping.

[0011] Further, the ejector pin mechanism comprises an ejector pin bottom plate, an ejector pin upper plate, a guide column and an ejector pin, the ejector pin upper plate is connected on the ejector pin bottom plate, the guide column and the ejector pin are arranged on the ejector pin upper plate, the lower die plate and the lower die insert block are provided with through holes, the guide column extends upwards from the through hole on the lower die plate, and the ejector pin extends upwards from the through hole on the lower die insert block.

[0012] The utility model discloses beneficial effects.

[0013] The utility model solves the waste problem of much waste material of cold runner mould, also solves the problem that needle valve type hot nozzle directly points on the surface of workpiece and cannot be formed, reduces waste material cost, guarantees injection molding without defect, adopts the mould structure of oil cylinder drag type cavity slider ejection, and waste material is automatically ejected, and the labor intensity of operator is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to make the technical problem, technical scheme and beneficial effect solved by the utility model more clearly, the utility model is further detailed below with the drawings and specific embodiment.It should be understood that the specific embodiment described here is only used to explain the utility model, and is not used to limit the utility model.

[0015] Figure 1 It is the structure schematic diagram of the upper die part of the utility model.

[0016] Figure 2 It is the structure schematic diagram of the lower die part of the utility model.

[0017] Figure 3 It is the cross section structure schematic diagram of the open type single nozzle hot runner system part structure of the utility model.

[0018] Marked in the drawing: 1 is upper die plate, 2 is open type hot nozzle, 3 is heating wire group, 4 is panel, 5 is positioning ring, 6 is hot runner junction box, 7 is wiring slot, 8 is lower die plate, 9 is cavity slider, 10 is lower die holder, 11 is die foot, 12 is lower die insert block, 13 is upper die insert block, 14 is semicircular column distribution channel, 15 is sprue, 16 is slider holder, 17 is oil cylinder fixed plate, 18 is opening oil cylinder, 19 is end limit plate, 20 is connecting shaft, 21 is baffle, 22 is workpiece groove, 23 is guide sleeve, 24 is guide column, 25 is ejector pin bottom plate, 26 is ejector pin upper plate, 27 is guide column, 28 is ejector pin, 29 is telescopic mandrel. SPECIFIC EMBODIMENT

[0019] The embodiment provides a hot runner to cold runner injection mold for steering shaft spline, which comprises an upper mold part and a lower mold part, a guide sleeve 23 is arranged on the upper mold plate 1, a guide column 24 is arranged on the lower mold plate 8, the guide column 24 can extend into the guide sleeve 23, and the lower mold plate 8 is connected with the upper mold plate 1 through the guide sleeve 23 and the guide column 24, so that the upper mold plate 1 and the lower mold plate 8 are positioned in a closed mold.

[0020] The upper mold part comprises the upper mold plate 1 and an open single-nozzle hot runner system, and the open single-nozzle hot runner system comprises an open hot nozzle 2, a heating wire set 3, a panel 4, a positioning ring 5 and a hot runner junction box 6.

[0021] The open hot nozzle 2 is connected in a mounting hole of the upper mold plate 1 and communicates to a lower side of the upper mold plate 1, the heating wire set 3 is connected with the open hot nozzle 2, the panel 4 is located above the open hot nozzle 2, and the positioning ring 5 penetrates through a middle part of the panel 4 and press-fits and fixes the open hot nozzle 2.

[0022] A wiring groove 7 is arranged on an upper surface of the panel 4, heating wires and sensing wires of the heating wire set 3 are connected with the hot runner junction box 6 through the wiring groove 7, the hot runner junction box 6 is connected on the upper mold plate 1, the hot runner junction box 6 is externally connected with a temperature control box, temperature control of the open hot nozzle 2 is realized, and stable and accurate temperature control operation is ensured.

[0023] The lower mold part comprises the lower mold plate 8, a cavity slide block 9, an opening mechanism, a limiting mechanism, a ejector pin mechanism, a lower mold base 10 and a mold foot 11.

[0024] The lower mold plate 8 is supported above the lower mold base 10 through the mold foot 11 on two sides of a bottom part, the mold foot 11 is fixed with the lower mold plate 8 and the lower mold base 10 through bolts, and the mold foot 11 plays a role of supporting the lower mold plate 8.

[0025] The cavity slide block 9 is arranged on the opening mechanism, and an inner space of the cavity slide block 9 is used for shaping a workpiece. The opening mechanism comprises a slide block base 16, an oil cylinder fixing plate 17 and an opening oil cylinder 18. A cylinder body of the opening oil cylinder 18 is connected to a side of the lower mold plate 8 through the oil cylinder fixing plate 17, an oil cylinder telescopic shaft 29 of the opening oil cylinder 18 is connected with the slide block base 16, and the cavity slide block 9 is arranged on the slide block base 16. The slide block base 16 is driven to move by the telescopic shaft 29 of the opening oil cylinder 18, so that the cavity slide block 9 moves and is demolded when the workpiece is molded and formed, and the molded spline shaft workpiece is taken out by an operator.

[0026] The limiting mechanism is connected to the other side of the lower die plate 8, and comprises an end limiting plate 19, a connecting shaft 20 and a baffle 21. The end limiting plate 19 is connected to one side of the lower die plate 8 through the connecting shaft 20, and is used for abutting against the end of the workpiece to limit the axial position of the workpiece. The baffle 21 is arranged on the connecting shaft 20, and a workpiece groove 22 is formed in the baffle 21, the workpiece is put into the workpiece groove 22, and the baffle 21 is used for stopping the shoulder on the shaft of the workpiece to limit the axial position of the workpiece.

[0027] A lower die insert 12 is arranged between the cavity slide block 9 and the limiting mechanism on the lower die plate 8, and an upper die insert 13 is arranged below the upper die plate 1 at a position corresponding to the lower die insert 12. The upper die insert 13 and the lower die insert 12 are both provided with a semicylindrical runner 14 corresponding to each other and can be combined into a cylindrical runner. The cylindrical runner is in communication with the inside of the cavity slide block 9. A sprue 15 is arranged on the lower die plate 8 beside the semicylindrical runner 14 and is in communication with the cylindrical runner. The sprue 15 corresponds to the lower part of the open single-nozzle hot runner system. The open single-nozzle hot runner system is heated to the working temperature. In the clamped state, the molten plastic is injected from the open hot nozzle 2, passes through the cylindrical runner and enters the cavity slide block 9 to be molded.

[0028] The ejector mechanism is arranged on the lower die base 10, and comprises an ejector bottom plate 25, an ejector upper plate 26, a guide column 27 and an ejector pin 28. The ejector upper plate 26 is connected to the ejector bottom plate 25. The guide column 27 and the ejector pin 28 are both arranged on the ejector upper plate 26. The lower die plate 8 and the lower die insert 12 are both provided with through holes. The guide column 27 extends out of the through hole on the lower die plate 8 to the upper side. The ejector pin 28 extends out of the through hole on the lower die insert 12 to the upper side. The lower die base 10 is provided with a through hole at a position corresponding to the ejector mechanism. The machine tool equipment below the lower die base 10 is provided with an ejector mechanism. The ejector rod of the ejector mechanism can extend into the through hole to directly lift the ejector bottom plate 25 and the ejector upper plate 26. After molding, the ejector mechanism of the machine tool equipment lifts the ejector mechanism, and the residual runner is ejected by the ejector pin 28. The weight of the cold runner is only 1 / 4 of the weight of the runner of the normal cold runner mold, thereby reducing the cost of waste materials, shortening the injection cycle and improving the stability of the product.

[0029] It can be understood that the above specific description of the utility model is only used for illustrating the utility model and is not limited to the technical solutions described in the utility model embodiments. Those skilled in the art should understand that the utility model can still be modified or replaced equivalently to achieve the same technical effect. As long as the use needs are met, it is within the protection scope of the utility model.

Claims

1. A hot runner to cold runner transfer injection mold for a steering shaft spline, comprising an upper mold portion and a lower mold portion, characterized by, The upper die part includes an upper die plate (1) and an open single nozzle hot runner system arranged on the mounting hole of the upper die plate (1) and communicated to the lower side of the upper die plate (1), and the lower die part includes a lower die plate (8), a cavity slider (9), a mold opening mechanism, a limiting mechanism, a ejector pin mechanism, a lower die base (10), and a die foot (11), the cavity slider (9) is arranged on the mold opening mechanism, the mold opening mechanism is connected to one side of the lower die plate (8), the limiting mechanism is connected to the other side of the lower die plate (8), the lower die plate (8) is provided with a lower die insert (12) between the cavity slider (9) and the limiting mechanism, the lower side of the upper die plate (1) is provided with an upper die insert (13) corresponding to the position of the lower die insert (12), the upper die insert (13) and the lower die insert (12) are correspondingly provided with a semi-cylindrical runner (14) and can be combined into a cylindrical runner, the cylindrical runner is communicated with the inside of the cavity slider (9), the lower die plate (8) is provided with a gate (15) beside the semi-cylindrical runner (14) and communicated with the cylindrical runner, the gate (15) corresponds to the lower side of the open single nozzle hot runner system, the lower die plate (8) is supported above the lower die base (10) through the die foot (11) on both sides of the bottom, the ejector pin mechanism is located on the lower die base (10) and partially penetrates the lower die insert (12), and the lower die base (10) is provided with a through hole corresponding to the position of the ejector pin mechanism.

2. A hot runner to cold runner transfer injection mold for a steering shaft spline according to claim 1, wherein, The open single nozzle hot runner system includes an open hot nozzle (2), a heating wire group (3), a panel (4), a positioning ring (5), and a hot runner junction box (6), the open hot nozzle (2) is connected in the mounting hole of the upper die plate (1) and communicated to the lower side of the upper die plate (1), the heating wire group (3) is connected with the open hot nozzle (2), the panel (4) is located above the open hot nozzle (2), the positioning ring (5) penetrates the middle of the panel (4) and press-fits the open hot nozzle (2), the upper surface of the panel (4) is provided with a wiring groove (7), the heating wire group (3) is connected with the hot runner junction box (6) by penetrating out of the wiring groove (7), and the hot runner junction box (6) is connected to the upper die plate (1).

3. A hot runner to cold runner transfer injection mold for a steering shaft spline according to claim 1, wherein, The mold opening mechanism includes a slider seat (16), an oil cylinder fixing plate (17), and an opening oil cylinder (18), the cylinder body of the opening oil cylinder (18) is connected to the side of the lower die plate (8) through the oil cylinder fixing plate (17), the oil cylinder telescopic shaft (29) of the opening oil cylinder (18) is connected with the slider seat (16), and the cavity slider (9) is arranged on the slider seat (16).

4. The hot runner to cold runner transfer injection mold for steering shaft splines of claim 1, wherein, The limiting mechanism includes an end limiting plate (19), a connecting shaft (20), and a baffle (21), the end limiting plate (19) is connected to one side of the lower die plate (8) through the connecting shaft (20), the baffle (21) is arranged on the connecting shaft (20), and the baffle (21) is provided with a workpiece groove (22).

5. A hot runner to cold runner transfer injection mold for a steering shaft spline according to claim 1, wherein, The upper die plate (1) is provided with a guide sleeve (23), the lower die plate (8) is provided with a guide column (24) corresponding to the guide sleeve (23), the guide column (24) can extend into the guide sleeve (23), so that the upper die plate (1) and the lower die plate (8) are positioned when the mold is closed.

6. A hot runner to cold runner transfer injection mold for a steering shaft spline according to claim 1, wherein, The ejector mechanism comprises an ejector bottom plate (25), an ejector upper plate (26), a guide column (27) and an ejector pin (28), the ejector upper plate (26) is connected to the ejector bottom plate (25), the guide column (27) and the ejector pin (28) are both arranged on the ejector upper plate (26), the lower die plate (8) and the lower die insert (12) are both provided with a through hole, the guide column (27) extends from the through hole on the lower die plate (8) to the upper side, and the ejector pin (28) extends from the through hole on the lower die insert (12) to the upper side.

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