WO2004110724A1

WO2004110724A1 - Metal mold for molding bush of double-layer structure

Info

Publication number: WO2004110724A1
Application number: PCT/JP2003/007520
Authority: WO
Inventors: Yoshikazu Tsujimoto; Yoshiharu Matsumoto
Original assignee: Toyo Tire & Rubber Co., Ltd.
Priority date: 2003-06-12
Filing date: 2003-06-12
Publication date: 2004-12-23
Also published as: JP3959094B2; AU2003242362A1; JPWO2004110724A1

Abstract

A metal mold for molding a bush of double-layer structure capable of efficiently manufacturing the bush by facilitating the molding of the bush of double-layer structure, comprising a first cope (10) for outer layer formation, a second cope (20) for inner layer formation, and a drag (8) having a plurality of mold holes (81) and common to both copes combined with each other, wherein a groove (84) for a runner leading to the filling gates (83) of the mold holes to a cavity (C1) for outer layer rubber is formed in the upper surface of the drag (8), and a recessed part (29) capable of storing at least a spool portion (A1-2) of an outer layer rubber (A1) remaining on the drag (8) is provided in the lower surface of the second cope (20), whereby an inner layer rubber (A2) can be vulcanizingly formed by clampingly connecting the second cope (20) to the drag (8) while the spool portion (A1-2) and a runner portion (A1-1) produced by the formation of the outer layer rubber (A1) remain on the upper surface of the drag.

Description

Mold for forming double layer bush

〔Technical field〕

TECHNICAL FIELD The present invention relates to a metal mold for manufacturing a two-layer bush used for a stabilizer bush or the like of a vehicle. [Background technology]

For example, a stabilizer bush of a vehicle is generally made of a rubber elastic body having a thick cylindrical shape, and a through hole of the stabilizer bar of the vehicle is held in its inner hole. As shown in FIG. 27, the bush A has an inner hole a 1 through which the stabilizer bar Sb penetrates, and a flat outer surface a 2 having a trunk outer surface serving as a contact surface with respect to the vehicle body mounting surface. A substantially U-shaped peripheral surface a3 that is continuous with the flat surface a2. The flat U-shaped peripheral surface a3 is brought into contact with a mounting surface of a vehicle body with the flat surface a2 as a top portion, and a substantially U-shaped peripheral surface a3 is substantially formed. Hold with U-shaped bracket B. The bracket B is fixed to the mounting surface of the vehicle body by fixing bolts (not shown) that pass through the mounting holes bl and bl at both ends. Flanges a4, a4 are provided at both ends of the bush A, and the bracket B holds the bush A between the flanges a4, a4.

In recent years, in the bush A, as shown in FIGS. 24 and 25, a rubber elastic material has been slid, as shown in FIGS. It has been proposed to have a two-layer structure of an inner rubber A2 made of a highly dynamic rubber material and an outer rubber A1 made of a rubber material having higher rigidity and strength than the inner rubber A2 ( For example, JP-A-10-169711, JP-A-11-344060, JP-200-1 Japanese Patent Publication No. 2006-0624, Japanese Patent Publication No. 200-02-311179 Publication). In order to manufacture the above-mentioned two-layer structure bush, since the inner rubber A2 and the outer rubber A1 are different kinds of rubber, usually, first, an outer rubber material is injected into a mold hole of a molding die by an injection machine. Vulcanized or semi-vulcanized and then the core (core) is changed, and the inner rubber material is injected into the mold hole by another injection machine, vulcanized and the inner and outer rubber is vulcanized and bonded. I do.

In this vulcanization molding, it is necessary to switch the outer layer rubber and the inner layer rubber and their respective injection machines, and it is necessary to change the core from the outer layer molding to the inner layer molding. In addition, it is necessary to provide a sprue for supplying a rubber material, an injection gate for a runner and a mold hole, and the like separately for each of the outer rubber and the inner rubber.

Therefore, it is mechanically difficult to compose both the outer layer rubber and the inner layer rubber by vulcanization molding only by exchanging the core with a molding die consisting of a pair of upper and lower dies. And implementation is difficult.

Therefore, it is conceivable that the upper and lower molds for the outer layer molding and the inner layer molding are used for one lower mold, and the upper and lower molds are replaced during the molding cycle so that the inner and outer layer rubbers are continuously injection-molded. Have been.

According to the present invention, when two upper molds are used for one lower mold as described above, the inner layer molding is performed while leaving a part of a sprue and a runner portion generated by molding the outer layer rubber on the upper surface of the lower mold. The upper rubber mold is closed and joined to the lower mold so that the inner rubber can be vulcanized and molded, and the molding efficiency can be improved.

[Disclosure of the Invention]

The present invention relates to a two-layer push molding die in which different types of inner and outer layer rubbers are laminated, a first upper die for forming an outer layer to which a nozzle of an injection machine for an outer layer rubber material is connected; Rubber material injection machine nozzle is connected to the inner layer molding _v A second upper mold and a plurality of mold holes corresponding to the outer peripheral shape of the bush to be molded are provided on the upper surface side, and are provided so as to be mold-closed to the first and second upper molds respectively. A lower mold common to the upper molds; and an upper surface of the lower mold connected to a sprue vertically penetrating the upper mold at the time of joining the first upper mold, and A runner groove communicating with the injection gate for the outer rubber cavity in each of the mold holes is formed, and a sprue part and a runner part of the outer rubber are formed on the upper surface of the lower die by the releasing action of the first upper die. And a recess capable of accommodating at least a part of the remaining outer layer rubber sprue is provided on the lower surface of the second upper mold.

According to this molding die, the first upper mold is closed and joined to the lower mold having a mold hole to form an outer layer. The rubber is vulcanized or semi-vulcanized, and then the first upper mold is formed. Instead of the mold, the second upper mold is closed and joined to the lower mold, and the inner rubber is vulcanized and molded so as to be laminated inside the outer rubber, whereby different kinds of inner and outer rubbers are laminated. A two-layer structure bush can be manufactured. In particular, in the case of the present invention, even if a sprue portion or a runner portion of the rubber generated by molding of the outer layer rubber remains on the upper surface of the lower mold, the second upper mold is closed and joined to the lower mold. In doing so, the sprue part, which forms an upwardly projecting shape, is accommodated in a recess provided on the lower surface of the second upper mold, so that the remaining sprue part, etc., of the second upper mold relative to the lower mold There is no risk of obstructing the closing, and the second upper die can be reliably closed and joined to the lower die. In other words, there is no need to remove a part of the sprue of the outer rubber before vulcanizing the inner rubber, and after vulcanizing or semi-vulcanizing the outer rubber, the inner rubber is vulcanized and molded inside the outer rubber. And the molding efficiency can be increased.

Moreover, by using two upper dies, one for forming the outer layer and the other for forming the inner layer, it is necessary to separately provide the outer rubber and the inner rubber separately. Machines or sprues, runners and injection gates can be easily set and the mold structure can be simplified.

In the above molding die, the first upper die is vertically movably supported in a first molding stage for molding an outer layer rubber, and the second upper die is in a second molding stage for molding an inner layer rubber. The lower mold is supported so as to be movable up and down, and the lower mold is movable from a lower corresponding position of the first upper mold to a lower corresponding position of the second upper mold. When the upper dies are lowered, the upper dies and the respective dies can be closed and joined.

Thereby, the lower mold in which the mold holes are formed is transferred to the first molding stage for molding the outer rubber and the second molding stage for molding the inner rubber, and the outer rubber and the inner layer are molded. It can be molded of rubber. For this reason, it is not necessary to move the first upper mold for forming the outer layer and the second upper mold for forming the inner layer to which the injection machine is connected, and the lower mold having the outer rubber layer left in the mold hole is not necessary. Simplifies the transfer structure. In addition, it is not necessary to remove the outer rubber that has been vulcanized or semi-vulcanized earlier in the first molding stage from the mold hole. Therefore, the two-layer structure bush can be easily and efficiently manufactured.

Further, in the molding die, the second upper die is composed of two upper and lower plates which are separated from each other, and is continuous with a sprue vertically penetrating the upper plate between the upper and lower plates. In addition to the formation of a runner groove to be formed, the lower plate is connected to the second gate connecting to the injection gate from above with respect to the inner layer rubber molding cavity in each of the mold holes following the runner groove. It is preferable that a pull is provided so that a sprue portion and a runner portion of the inner layer rubber remain on the lower plate due to a separating action of the upper and lower plates. As a result, the outer rubber material and the inner rubber material can be injected into each cavity through separate sprues, runners, and injection gates, and a sprue part and a runner part of the previously formed outer rubber remain on the upper surface of the lower mold. Even if it does, the inner layer rubber material can be injected. Moreover, the sprue part and the runner part of the outer rubber are formed between the lower mold and the first upper mold, and the sprue part and the runner part of the inner rubber are formed by the upper and lower presses of the second upper mold. These removals and removals can be performed individually because they occur between gates.

In the above molding die, the lower surface of the first upper die is inserted into the die hole when the die is closed and joined to the lower die, so that an outer layer rubber is formed between the lower die and the inner peripheral surface of the die hole. A first core pin forming a cavity of the second die is protruded, and the lower surface of the second upper die is inserted into the die hole when the die is closed and joined to the lower die. It is preferable that a second core pin that forms a cavity for the inner rubber is protruded between the outer core and the outer rubber.

Thus, the first upper die is closed and joined to the lower die, whereby the first core pin on the lower surface of the first upper die can be inserted into the die hole. A cavity for the outer rubber layer can be formed in the mold cavity. Further, by closing and joining the second upper mold to the lower mold, the second core pin on the lower surface of the second upper mold can be inserted into the mold hole, A cavity for the inner rubber can be formed inside the outer rubber in the hole. Therefore, no special work operation and mechanism for replacing the core pin is required, and the core pins can be replaced simply by closing and joining the upper molds to the lower molds, respectively, A cavity corresponding to the outer rubber and the inner rubber can be formed in the mold cavity.

[Brief description of drawings] FIG. 1 is a schematic front view showing an outline of an apparatus for manufacturing a two-layer structure bush provided with a molding die of the present invention.

FIG. 2 is a schematic plan view showing an arrangement state of each stage in the above apparatus.

FIG. 3 is a schematic explanatory view of the steps in the case where the manufacturing method of the present invention is carried out using the above apparatus.

FIG. 4 is a schematic front view of a first upper mold and a lower mold separated in a first molding stage for molding the outer layer rubber.

FIG. 5 is a schematic front view of a second upper die and a lower die separated in a second molding stage for molding the inner layer rubber.

FIG. 6 is a plan view of the lower die.

FIG. 7 is a sectional view taken along line VII-VII of FIG.

FIG. 8 is a cross-sectional view of the first upper mold and the lower mold in VIII-VIII of FIG. 6 before the mold is closed.

FIG. 9A is a cross-sectional view of the first upper mold and the lower mold in a closed state along the same line. FIG. 9B is an enlarged cross-sectional view of the same mold hole portion.

FIG. 10 is a cross-sectional view of the state of forming the outer layer taken along line XX of FIG.

FIG. 11 is a cross-sectional view of the second upper die and the lower die before closing the die along the same cross-sectional line as FIG.

FIG. 12A is a cross-sectional view of the second upper mold and the lower mold in a closed state along the same line.

FIG. 12B is an enlarged cross-sectional view of the same mold hole portion.

FIG. 13 is a cross-sectional view of the inner layer forming state along the same cross-sectional line as FIG.

FIG. 14 is a plan view schematically showing a lower die moving stage and a demolding stage.

FIG. 15 is a cross-sectional view taken along line XV-XV in the preceding figure. FIG. 16 is a front view in which a part of the detachable stage including the transfer trolley is omitted.

FIG. 17 is a schematic plan view of a part showing an engagement structure between the pushing and pulling means for moving the lower die and the lower die.

FIG. 18 is a front view of a part of the above.

FIG. 19 is an enlarged front view showing an outline of the demolding apparatus in the demolding stage.

FIG. 20 is a partial cross-sectional view showing a detached state by the above device.

FIG. 21 is a front view schematically showing a demolding stage and a product recovery section. FIG. 22 is a schematic plan view of the above.

FIG. 23 is an explanatory diagram of a state in which a molded product is extracted at the product collection section. FIG. 24 is a perspective view illustrating a two-layer structure bush to be manufactured.

FIG. 25 is a cross-sectional view taken along the line XXV—XXV in the above.

FIG. 26 is a perspective view of only the outer rubber layer of the two-layer push.

FIG. 27 is a perspective view illustrating a bush used as a push-in switch for the stabilizer.

BEST MODE FOR CARRYING OUT THE INVENTION The best mode for carrying out a molding die for manufacturing a two-layer bush according to the present invention will be described based on an embodiment shown in the drawings. The invention is not limited to this.

The two-layered structure bush A to be molded is, for example, a cylindrical bush shown in FIGS. 24 and 25, and has an inner hole a1 through which a stabilizer bar passes, and a body outer shape. It comprises a flat surface a2 serving as a contact surface with the vehicle body mounting surface, and a substantially U-shaped peripheral surface a3 continuous with the flat surface a2. This bush A has an inner layer rubber A2 made of a rubber material having high slidability, and a stiffer than the inner layer rubber A2. It is formed of an outer layer rubber A1 made of a rubber material having high properties and hardness and high strength, and has flanges a4 and a4 at both ends in the axial direction. Reference numeral a5 denotes a mounting portion for mounting on the sunset bar.

First, an embodiment of a manufacturing apparatus including a molding die for manufacturing a two-layer bush according to the present invention will be described.

As schematically shown in FIGS. 1 and 2, the manufacturing apparatus of this embodiment includes a first molding stage 1 for molding an outer rubber A 1 of a two-layer structure bush A to be molded, and an inner rubber A 2. A second molding stage 2 to be formed and a lower mold moving stage 4 connected to a demolding stage 3 of a molded product (a bush A) are arranged in parallel. Normally, the lower mold moving stage 4 and the demolding stage 3 are arranged between the first and second molding stages 1 and 2 in the parallel direction of the two molding stages 1 and 2 as shown in FIG. The removal stage 3 is provided with a removal device 6. In addition, a retracting stage 41 for a transfer carriage, which will be described later, is provided continuously behind the detachable stage 3 and the lower mold moving stage 4 in a parallel direction.

In the figure, reference numeral 8 denotes a lower mold having a mold hole 81 corresponding to the outer peripheral shape of the bush A on the upper surface side, and reference numeral 10 denotes an outer layer rubber A1 of the push A to be molded in the first molding stage 1. A first upper mold 20 to be molded is a second upper mold for molding the inner layer rubber A2 of the bush A in the second molding stage 2.

The lower mold 8 is appropriately transferred from the first molding stage 1 to the second molding stage 2 via the lower mold moving stage 4 as shown by a white arrow in FIG. It is provided so as to be sequentially transferred from the second molding stage 2 to the demolding stage 3 and further from the demolding stage 3 to the first molding stage 1. Usually, using two lower molds 8 of the same configuration, The outer layer rubber A1 and the inner layer rubber A2 are individually formed by sequentially transferring the lower dies 8 as described above.

The first and second upper dies 10 and 20 are respectively connected to a press device (not shown) such as a hydraulic cylinder and are supported so as to be able to move up and down, as shown in FIG. The lower mold 8 is positioned at a position corresponding to the lower side of the first upper mold 10 on the first molding stage 1 or the lower mold 8 is positioned on the second molding stage 2 as shown in FIG. When the first upper die 10 or the second upper die 20 descends in a state where the lower die 8 is located at the lower corresponding position of the second upper die, the upper die 10 It is provided so that the mold can be closed and joined.

Each component and device configuration will be described in detail.

As shown in FIGS. 6, 7, 8 to 13, etc., the lower die 8 is removably fitted from above into a concave portion 80 a on the upper surface side of the lower die body 80 having a concave cross section. And a middle mold 82 in which the plurality of mold holes 81 are formed in two rows. The middle mold 82 has a core mold portion 82a at the center in the two rows of mold hole parallel portions, and a slide core portion 82 provided detachably attached to both sides of the core mold portion 82a. b, 8 2 b, and a notch corresponding to the mold hole 81 having side surfaces opened at both side edges of the core mold portion 8 2 a, that is, a notch corresponding to the substantially U-shaped peripheral surface a 3 of the bush is formed. At the same time, the side surfaces thereof are closed by the slide core portions 82b, 82b so that a mold hole 82 corresponding to the bush A is formed.

On the upper surface of the lower die 8, particularly on the upper surface of the core die portion 8 2 a, at the time of closing and joining the first upper die 10, a rubber material for vertically penetrating the upper die 10 is provided. A runner groove 84 which is continuous with the sprue and communicates with each injection gate 83 into each of the mold holes 81 is formed.

The middle mold 82 is disposed at the removal stage 3 from the lower mold body 80. The bush molding is separated from the core mold portion 82a to both outsides while being pulled out upward and the slide core portions 82b, 82b are separated from the core mold portion 82. It is provided so that it can be separated from a.

Therefore, the two slide cores 8 2b and 8 2b constituting the middle die 82 are connected to the slide pins 85 and 85 protruding from both sides of the core die 82 a by screwing means. On the other hand, it is loosely fitted and supported so that it can slide. The slide bins 85, 85 have concave grooves 80 b, which are provided on both sides of the lower mold body 80 when the middle mold 82 is fitted into the recess 80 a of the lower mold body 80. The slide cores 8 2b, 8 2b can be slid on both sides by being pulled out upward when the middle mold 82 is pulled out upward. It is like that.

At the front and rear ends of the core mold portion 82a and the slide core portions 82b, 82b of the middle mold 82, engagement projections 8a, 8 with which a lifting means such as a cylinder device to be described later can be engaged. a is provided. Reference numerals 87 denote alignment holes provided on the upper surface side at the four corners of the lower die main body 80, and the first upper die 10 or the first upper die 10 at the first and second molding stages 1 and 2. When the second upper mold 20 is closed, the positioning pins 17 or 27 vertically provided at the four lower corners of each upper mold 10, 20 and each of the upper molds 10, 20 are provided with the positioning holes 87. The first upper die 10 or the second upper die 20 can be closed and joined to the lower die 8 without slipping by fitting into the lower die 8.

Reference numeral 80c denotes a core mold that forms a bottom surface in the recess 80a in the lower mold body 80. Reference numeral 8 denotes a pin for aligning the lower die body 80 with the middle die 82. An upper end portion is fixed to the middle die 82, and a lower part is the core die 80. The lower die main body 80 including c is fitted in a through hole 80 d that penetrates the lower die main body 80 in the up and down direction so as to be slidable. Also, the pin 88 is connected to the through hole 80 d. The middle mold 82 is provided so as to maintain a fixed positional relationship with the lower mold body 80 by being held in the fitted state.

Reference numeral 89 denotes a through hole into which a suspension support pin, which will be described later, is fitted when the second upper mold 20 is closed. The slide core portions 8 2b and 8 2b of the through hole 89 are described later. It also serves as an engagement hole for the slide core portions 82b, 82b. Reference numerals 8b and 8b denote engagement protrusions for lower die movement provided at both left and right end portions of the lower die body 80, and are provided so as to be engaged with later-described movement push-pull means. Reference numeral 8c denotes a guide groove for movement provided in the width direction below the front and rear ends of the lower die body 80.

As shown in FIGS. 8 to 10, the first upper mold 10 includes a main body 10 a and an upper plate 10 b, and a lower surface of the main body 10 a in the upper mold 10. First, a cavity C1 for the outer layer rubber is formed between the lower die 8 and the inner peripheral surface of the die hole 81 by being inserted into the die hole 81 when the die is closed. Core pins 11 are protrudingly provided at positions corresponding to the mold holes 81 of the lower die 8 in parallel, for example, in two rows as shown in the figure. The injection gate 83 is provided in the lower mold 8 so that a rubber material can be injected and injected into the cavity C1 from the side.

The core pin 11 is fitted inside a holding member 12 fixed to the main body 10a and held so as not to be able to be pulled out downward, and is disposed inside the holding member 12 It is pressed in the protruding direction by the repulsive force of the panel member 13, and is elastically pressed against the lower surface of the mold hole 81 of the lower mold 8. The outer peripheral surface of the core pin 11 is roughened by means such as sand blasting so as to have minute irregularities on the surface. With such a molding, the inner peripheral surface of the outer layer rubber A1 becomes a rough surface having minute irregularities, thereby increasing the adhesive strength with the inner layer rubber A2 laminated on the inner peripheral surface. In other words, a two-layer bushing excellent in the integration of the inner and outer rubber layers can be obtained, which is particularly preferable. At the center of the upper surface of the first upper mold 10 is provided a connection port 14 to which a nozzle (not shown) of an injection machine made of an outer layer rubber material is joined. A sprue 15 is provided on the lower surface of the sprue 15 which is in contact with the lower die 8. The sprue 15 communicates with the runner groove 84 on the upper surface of the lower die 8 when the lower die 8 is closed and joined.

Further, as shown in FIGS. 11 to 13, the second upper mold 20 is composed of upper and lower two relatively thick plates 20 a and 20 b which are separated and joined to each other, The lower surface of the upper mold 20, that is, the lower surface of the lower plate 2 Ob is slightly smaller in diameter than the first core pin 11, and the mold hole is formed when the mold is closed and joined to the lower mold 8. A second core that forms a cavity C2 for the inner rubber A2 with the outer rubber A1 previously formed in the mold hole 81 by being inserted into the mold hole 81. A pin 21 protrudes from the lower die 8 at a position corresponding to the die hole 81. For example, as shown in the figure, they are protruded in two rows in parallel.

At the center of the upper surface of the second upper mold 20, there is provided a connection port 24 to which a nozzle (not shown) of an inner rubber material injection machine is joined. And a sprue 22 extending through the lower surface of the upper plate 20a. At least one of the upper and lower plates 20a and 20b, for example, on the lower surface of the upper plate 20a, is continuous with the sprue 22 and the mold is closed and joined to the lower mold 8. A runner groove 23 is formed to a position corresponding to the upper side of the hole 81.

Further, the lower plate 20 b is connected to the runner groove 23, and the second upper die 20 is closed to the lower die 8 at the time of closing the die. Each spout gate 26 from above the cavity C2 for the inner layer rubber is provided with a sprue 25 which communicates therewith. As a result, the cavity C2 inside the outer layer rubber A1 in the mold hole 81 is passed from above, that is, through the injection gate 26 different from the injection gate 83 of the outer layer rubber material. Thus, the inner rubber material can be injected from above regardless of the runner portion A l-1 ゃ sprue portion A 1-2 of the outer rubber Al.

The lower plate 20b is slidably fitted to a hanging support bin 28 fixed to the upper plate 20a and hanging down and having an engaging portion 28a at the lower end. When the upper mold 20 is closed with respect to the lower mold 8, the lower plate 20 b contacts the upper plate 20 a, and in the non-mold closed state, As described above, the lower plate 20b is separated from the upper plate 20a and is engaged with the engaging portion 28a at the lower end of the support pin 28 so that the lower plate 20b is maintained at a constant interval. It is provided so that. The runner portion A2-1-1 sprue portion A2-2 of the inner layer rubber A2 is connected to the upper and lower plates 2 from one side in a state where the upper and lower plates 20a and 20b are kept at an interval. It is provided so that it can be chucked and taken out and collected by the take-out means 100 entering between 0a and 20b. The take-out means 100 may be a hand with a robot chuck or the like, or may be moved forward or backward in response to the mold opening action after vulcanization molding to chuck the runner part A 2-1 ゃ sprue part A 2-2. Any structure can be used as long as it can be extracted. The hanging support pins 28 are fitted into the through holes 89 when the upper die 20 is closed with respect to the lower die 8.

In addition, on the lower surface of the lower plate 20b, that is, on the lower surface of the second upper mold 20, a recess 29 capable of accommodating at least a part A112 of the remaining outer layer rubber A1 is provided. The runner part A1-1 and the spool part A1-2 of the outer layer rubber A1 formed in the first molding stage 1 remain on the upper surface of the lower die 8, and the spool part A1-1-- Even if 2 is in the protruding state, the second upper mold 20 can be closed and joined to the lower mold 8 so that the inner rubber material can be injected and molded without any problem.

Further, the lower mold 8 is moved from the first molding stage 1 to the second molding stage 1. In order to move to the stage 2 and further to the demolding stage 3, the lower mold 8 can be set at a fixed height position on the first molding stage 1 and the second molding stage 2 respectively. The mounting tables 1a and 2a are provided, and the lower die 8 is mounted on the underframe 4a of the lower die moving stage 4 at substantially the same height as the mounting tables 1a and 2a. A transfer carriage 40 that can be transferred to the demolding stage 3 and that allows transfer from the first forming stage 1 to the second forming stage 2 is provided.

The moving means and device will be described.

On the mounting table 1 a of the first molding stage 1, a cylinder device 91 as a pushing and pulling means for pushing and pulling the lower die 8 from the mounting table 1 a to the lower die moving stage 4 is provided. Provided. This cylinder device 91 has an engagement means 91b at the end of the output shaft 91a, and the engagement means 91b is provided on one of the left and right sides of the lower mold body 80 of the lower mold 8. It is provided so as to be freely disengageable from the engaging projection 8b protruding from the side end of the member.

As the engaging means 91b, as shown in Figs. 17 and 18, a support plate 91c is attached to the tip of the output shaft 91a of the cylinder-device 91, A slide block 91e is provided on the support plate 91c so as to be able to slide in the front-rear direction via linear guide means 91d, and the lower die 8 is engaged with the slide block 91e. A hook-shaped engaging portion 91 f that is freely engageable with the convex portion 8 b is additionally provided, and the slide block 91 e is displaced in the front-rear direction by the operation of the cylinder device. The engaging piece 91f is engaged with and disengaged from the engaging projection 8b.

That is, the lower die 8 is moved to the first position by the advancing and retreating action of the output shaft 91 a of the cylinder device 91 in a state in which the engagement piece 91 f is engaged with the engagement projection 8 b. It is configured to be pushed from the molding stage 1 to the lower mold moving stage 4, or to be drawn from the lower mold moving stage 4 to the first molding stage 1. ;

Further, also on the mounting table 2 a of the second molding stage 2, the lower mold 8 is moved from the mounting table 2 a to the lower mold, facing the cylinder unit 9 1 of the first molding stage 1. A cylinder device 92 as a pushing / pulling means for pushing and pulling into and out of the moving stage 4 is provided facing the cylinder unit 9 1. Although not described in detail, the cylinder device 92 also has substantially the same configuration as the cylinder device 91, and has an engagement projection 8b at the other side end of the lower die 8. On the other hand, an engaging means 92b that can be disengaged is provided at the end of the output shaft 92a (Fig. 1), and the lower shaft 8 can be pushed and pulled by the advancing and retracting action of the output shaft 92a. Have been.

Further, as shown in FIGS. 14 to 16, the transfer carriage 40 in the lower die moving stage 4 is separated from the lower die moving stage 4 by the linear guide means 42 on the underframe 4a. It is provided so as to be able to reciprocate in the direction in which the mold stages 3 are connected (the front-back direction orthogonal to the parallel direction of the two molding stages 1 and 2). The transfer carriage 40 holds the lower mold 8 sent out from the second molding stage 2 at a position between the first and second molding stages 1 and 2 and moves the carriage 40 by moving the carriage 40. It has an upper holding section 43 for transferring to the removal stage 3, and is located between the first and second molding stages 1, 2 when the upper holding section 43 is located on the removal stage 3. Further, it has a slide moving section 44 that allows the lower mold 8 to be transferred from the first molding stage 1 to the second molding stage 2.

The front and rear portions of the slide moving portion 44 (the front and rear portions in the direction of movement of the bogie) are hook-shaped engaging with the widthwise grooves 8 c, 8 c provided below the front and rear ends of the lower die 8. The guide members 45, 45 are provided so that the lower die 8 can be transferred while maintaining a constant posture without displacement. In addition, the front and rear portions of the upper holding section 43 are also provided in front of the lower mold 8 fed onto the upper holding section 43. Guide members 46, 46 are provided for engaging with the concave grooves 8c, 8c. Various driving mechanisms can be used as driving means for reciprocating the transfer carriage 40 in the front-rear direction. In the illustrated embodiment, the output of the cylinder device 47 is provided on the lower surface of the transfer carriage 40. The shaft is connected, and is provided so as to reciprocate by the operation of the cylinder device 47. Reference numeral 48a denotes a stopper for moving the transfer carriage 40 forward (toward the demolding stage 3), and reference numeral 48b denotes a stopper for moving rearward to the cylinder. The transfer carriage 40, which reciprocates by the operation of the device 47, can be stopped at a set predetermined position. On both left and right sides of the demolding stage 3, moving guides 40 that allow the passage of engagement projections 8b provided on both left and right ends of the lower die body 80 of the lower die 8 are provided. a, 40 a are provided to face each other, so that the lower die 8 to be transferred can be transferred while restricting lateral displacement.

In the front and rear portions of the upper holding section 43 of the transfer carriage 40, the lower mold 8 held by the upper holding section 43 is transferred to the demolding stage 3, and the middle mold 82 is moved back and forth. Pushing means 50, 50 are provided for engaging with the engaging projections 8 a, 8 a at both ends to push up and withdraw the lower die body 80.

In the case of the illustrated embodiment, as shown in FIGS. 17 and 6, support blocks 49 and 49 are respectively provided on the front and rear portions of the upper holding section 43 so as to protrude therefrom. A hanging rod 51, 51 extending downward from 49 is provided, and a supporting substrate 52 is fixedly attached to the lower ends of both rods, and a cylinder device 5 for lifting up the supporting substrate 52 is provided. 3 is fixed with the output shaft facing upward. The output shaft of the cylinder device 53 is connected to an elevating support plate 54 disposed above the support substrate 52. A push-up pad 5 that penetrates the support blocks 49, 49 at both front and rear ends of the lifting support plate 54 so as to be vertically movable. 5, 55 are connected so that the cylinder unit 53 moves up and down together with the lifting support plate 54.

The upper end of the push-up port 55 55 has a cross-section which is fitted to the engaging projections 8 a, 8 a at the front and rear ends of the middle die 82 of the lower die 8 so as to be able to slide in the left-right direction. A substantially C-shaped engagement guide 56, 56 is attached. In the engagement guides 56, 56, the upper holding section 43 is located between the first and second molding stages 1, 2, and the push-up rods 55, 55 are lowered. When in the position, the engaging projections 8 a, 8 a of the lower die 8 fed from the second stage 2 onto the upper holding portion 43 are fitted and locked. When the lower die 8 moves to the demolding stage 3, the push-up ports 55, 55 move up together with the elevating support plate 54 by the operation of the cylinder unit 53, whereby the engagement is achieved. The middle mold 82 engaged with the guides 56, 56 is configured to be pushed up to a predetermined height above the lower mold body 80 and to be removed.

The removal height of the middle mold 82 is set so that the pin 8 8 for positioning the lower mold 8 does not come off the lower mold body 80, and the push-up height is the removal mold described later. This is the position where the molded product is released from the mold by the device 6.

As shown in FIGS. 21 and 19, a slide core portion of the middle mold 82 is provided above the removal stage 3 as a mold removal device 6 for the molded product from the pushed middle mold 82. Separating means for separating 8 2 b, 8 2 b to the left and right sides from the core mold portion 8 2 a, and molded products (part of the runner of the outer rubber A 1-1 besides the molded bush A)脱 Including the sprue part A 1 -2 etc.) from the core mold part 8 2a

In the case of the embodiment shown in the figure, on the left and right sides of the demolding stage 3, as the separating means, the middle dies 8 by the pushing means 50, 50. At the push-up height position of 2, the fitting pins 61, 61 supported by the cylinder devices 60, 60 capable of moving back and forth in the left and right opposite directions are pushed up. The slide core portions 8 2b, 8 2b It is provided so as to be fitted into the portion of the through hole 89 included in the hole. The fitting pins 61, 61 allow the slide cores 82, 82 to be pulled away from the core mold 82, left and right, by operating the cylinder devices 60, 60 in the fitted state. It has become.

The removal receiving means for the molded product or the like has the following configuration. A movable table movable between an upper position of the demolding stage 3 and an upper position of a product recovery unit 7 described below, on a gantry 62 arranged above a lifting height position of the middle die 82. The moving base 63 is provided with a lifting base 65 that is supported by the downwardly oriented cylinder device 64 that is capable of moving up and down. In the state in which the lifting / lowering base 65 is located at a position above the removal stage 3, the middle die 8.2 is pushed up to the pushing-up height position, and at the same time, the lifting / lowering base is actuated by the operation of the cylinder device 64. The support pins 66, 66 which are lowered together with the base 65 and are elastically fitted into the inner holes a1 of the bush A formed with the respective mold holes 81 of the middle mold 82 are formed in the respective mold holes 8. The numbers corresponding to 1 are arranged in two rows on the left and right.

The two rows of left and right support pins 6 6, 6 6 are respectively connected to the cylinder devices 6 7, 6 7 attached to the lower surface of the elevating base 65 and capable of moving back and forth in the left and right outer directions. 68, and are supported so as to be displaceable left and right outward by the operation of the cylinder unit 67, 67, and after the slide core portions 82b, 82b are separated from each other, By operating the cylinder devices 6 7, 67, the molded product in the left and right directions is inserted into the molded product and left and right outwards while being fitted into the molded product. It is detached by peeling it outward, and is lifted upward by the subsequent operation of the cylinder unit 64. 6 9 · is a guide rail for moving the movable table 63 provided on the mount 6 2, and 70 is a cylinder device for moving the movable table 63.

The elevating base 65 provided on the moving table 63 can be lowered by the operation of the cylinder unit 64 when the moving table 63 is located above the product collection section 7. 6, 66 can be lowered to a product extraction position provided in the product collection section 7. As shown in FIGS. 22 and 23, the product withdrawing position of the product collecting section 7 has cutouts 72, 72 that can be fitted to the support pins 66, 66 facing left and right. Product extraction plates 71 and 71 are provided. When the support bins 66, 66 holding the molded product are lowered, the product extracting plates 66, 66 are moved by the operation of the cylinder unit 73, 73, and the support pins 66, 66 are actuated. Then, when the support pins 66 and 66 rise in this state, the molded product comes out of the support pins 66 and falls. 74 is a conveying means for collecting the falling molded article.

The manufacturing state of the double-layer bush by the manufacturing apparatus of the above-described embodiment will be described. ,

In each case where one or a plurality of lower molds 8 are used, for each of the lower molds 8, each of the steps (1) to (6) in the process explanatory diagram of FIG.

① Outer layer rubber molding at the first molding stage and upper mold separation

② Lower mold movement to the second molding stage

③ Inner rubber molding at the second molding stage and runner part of inner rubber ゴム Removal of sprue part

の下 Lower mold movement to the removal stage

ラン Runner part of molded product and outer layer rubber at demolding stage 脱 Demolding and removal of sprue part

移動 Lower mold movement to the first molding stage By repeating the above steps, the outer rubber A1 and the inner rubber A2 are laminated and formed.

The manufacturing process will be described. First, in a state where one lower die 8 is positioned on the first molding stage 1, the first upper die 10 is lowered by operating the press device, and the first core pin 11 is moved to the lower die. The mold cavity 81 of the lower mold 8 is inserted into the mold cavity 81 and the mold is closed and joined to the upper surface of the lower mold 8 (FIG. 9A). Form C 1 (FIGS. 9A and 9B). In this state, the outer layer rubber material injected from the injection machine connected to the first upper mold 10 is fed through the sprue 15 and the runner groove 84, and from the side of the mold hole 11 Is injected into the cavity C1 from the injection gate 83, and the outer rubber A1 is vulcanized or semi-vulcanized (FIG. 10).

After the molding in the first molding stage 1, the first upper mold 10 is raised by the operation of the press device and separated from the lower mold 8. At this time, the molded outer layer rubber A1 remains in the mold hole 81, and a part of the runner A11 and a part of the sprue A1-2, which are continuous with the outer rubber A1, also remain. (Figure 3).

In this state, the lower die 8 is moved to the second molding stage 2 via the lower die moving stage 4 by the operation of the cylinder devices 91 and 92 as a push-pull means ((1) in FIG. 3). ). That is, at this time, in the lower die moving stage 4, the upper holding part 43 of the transfer carriage 40 is moving to the demolding stage 3 side, and the slide moving part 44 is moved by both the first and the second. It is located between the molding stages 1 and 2. Therefore, the lower die 8 is sent out from the mounting 1a onto the slide moving portion 44 by the cylinder unit 91 on the first molding stage 1 side, and the lower mold 8 on the second molding stage 2 side. By engaging the engaging means 9 2b of the cylinder unit 9 2 with the engaging projection 8b and pulling it onto the mounting table 2a of the second molding stage 2, it is lowered to the second molding stage 2. Type 8 Can be transported.

Next, in the second molding stage 2, the second upper mold 20 for inner layer molding is lowered by the operation of the press device, and the support pins 28 for suspension are fitted into the through holes 89. The upper and lower plates 20a and 20b are joined together, and the mold is closed and joined to the upper surface of the lower mold 8, and at the same time, the second core pin 21 of the upper mold 20 is inserted into the mold hole 8 1 is formed inside the outer layer rubber A1 in the mold cavity 81 to form a cavity C2 for the inner layer rubber inside the outer layer rubber A1 in the mold hole 81 (FIGS. 12A and 12B). ). At this time, a recess 29 is provided on the lower surface of the lower plate 2 Ob, and at least a part of the remaining outer rubber A 1 sprue A 1 1 2 etc. As described above, the mold can be closed and joined without any problem.

In this state, the inner rubber material injected from the injection machine connected to the second upper mold 20 is passed through the sprue 22, the runner groove 23 and the sprue 25, and Is injected into the cavity C2 from an injection gate 26, which is different from the injection gate 83, and vulcanization molding is performed so that the inner rubber A2 is laminated and adhered inside the outer rubber A1. (Figure 13). The vulcanization time at this time is appropriately set according to the rubber material and the molded product. Even if the outer rubber A1 is in a semi-vulcanized state, it is completely vulcanized together with the inner rubber A2 by the vulcanization molding in the second molding stage 2.

After the molding, the second upper mold 20 is lifted and separated from the lower mold 8. At this time, first, the upper plate 20a of the second upper die 20 is engaged with the lower plate 20b by the engagement portion 28a at the lower end of the suspending support pin 28 included therein. And separate the upper and lower plates 20a and 20b, and then separate the lower plate 20b from the lower die 8. In this state, the runner part A2-1—sprut part A2-2 of the inner layer rubber A2 generated between the upper and lower plates 20a and 20b is taken out by the takeout means 100. And then discarded. The molded product (push A) composed of the inner and outer layer rubbers A 2 and A 1 is held while remaining in the die hole 81 of the lower die 8 (③ in FIG. 3).

Thereafter, the lower die 8 is sent to the lower die moving stage 4 by the operation of the cylinder device 92. At this time, the transfer carriage 40 of the lower mold moving stage 4 has already moved backward, and the upper holding section 43 provided at the front of the transfer carriage 40 has the first and second forming stages 1, Therefore, the lower die 8 is placed on and held by the upper holding part 43. Pushing means 50, 50 having engagement guides 56, 56 at the upper ends of the push-up rods 55, 55 are provided on the front and rear portions of the upper holding portion, respectively. The engaging projections 8a, 8a at the front and rear ends of the middle mold 82 of the lower mold 8 are fitted to the dos 56, 56, respectively, and are held in the engaged state.

In this state, by the operation of the cylinder device 47, the transfer carriage 40 moves to the demolding stage 3 side, and the lower die 8 held by the upper holding part 43 moves to the position of the demolding stage 3. I do. After this movement, the lifting means 50,

By the operation of the cylinder device 53 for lifting at 50, the lifting ports 55, 55 are raised via the lifting support plate 54, and engaged with the engagement guides 56, 56. The middle mold 82 is withdrawn from the recess 80a of the lower mold body 80 upward, and is pushed up to the removal position at a predetermined height.

At the time of this pushing up, the fitting pins 61, 61 serving as pulling-out means provided above both sides are provided with through-holes 89, 8 formed in the slide core portions 82, 82 on both sides of the medium-sized mold 82. 9, the through-holes 89, 89 in both slide core portions 82 b, 82 b are pushed up by the middle-sized mold 82 as described above. Fits 6 1, 6 1. At the same time, the support pins 66 in the removal receiving means provided above the take-out stage 3

6 While the cylinder is held at the position corresponding to the mold hole 8 1. —During operation of the device 64, it is lowered to the release position and elastically fits into the inner hole a1 of the molded bush A, which is a molded product of the middle die 82, which is pushed up as described above. .

Subsequently, the engagement pins 61, 61 are moved outwardly by the operation of the cylinder devices 60, 60 of the separating means, so that the slide cores 8 2b, 8 2b slides on slide bins 85, 85 and separates from core mold portion 82a. Subsequently, the support bins 66, 66 fitted into the molded products are moved outward by the advance operation of the cylinder devices 67, 67, and each molded product is moved to the core mold portion 82. The mold is automatically released from the mold hole 81 of a. At this time, each molded product is connected by the runner part A1-1 of the outer layer rubber A1, but the runner part A1-1 can be released without any problem by being stretched by elastic deformation (Fig. 3 ⑤).

After the mold release, the support pins 66, 66 rise while holding the molded product, and both slide cores 82b, 82b return to a state of contact with the core mold 82a. . Then, by the operation of the cylinder device 53 of the lifting means, the lifting ports 55, 55 are lowered, so that the middle mold 82 fits into the recess 80a of the lower mold body 80. It returns to the combined state. Thereafter, the transfer carriage 40 moves rearward, and the upper holding section 43, that is, the lower die 8 placed on the upper holding section 43 is moved to a position between the first and second forming stages 1, 2. Return. In this state, the cylinder unit 91 as a pushing and pulling means of the first molding stage 1 advances, and the engaging means 91b at the tip thereof is provided at the side end of the lower die body 80. The lower die 8 is engaged with the engaging projection 8 b and is retracted by the operation of the cylinder device 91 in the retreating direction, and is pulled into the first molding stage 1.

Thereafter, in the first molding stage 1, the lower mold 8 is The outer layer rubber A1 is formed in the same manner as described above.

On the other hand, the support pins 66, 66 of the removal receiving means return to the original state at the ascending position, and the movement of the moving base 63 by the operation of the cylinder device 70 raises and lowers the lifting base. The product is moved to the upper position of the product collection section 7 together with 65, and thereafter, the molded product held by the support pins 66, 66 is extracted and collected by the above-described means.

Thus, the lower die 8 is moved from the first molding stage 1 to the lower die moving stage 4, the second molding stage 2, the lower die moving stage 4, the demolding stage 3, the lower die moving stage 4, The two-layer structure bush can be repeatedly and efficiently molded while being transferred in the order of the molding stage 1. Since the lower die 8 is moved in this manner, its transfer structure is simplified, and it can be moved accurately and quickly using, for example, a single cylinder device.

In particular, when two lower dies 8 are used, one lower die 8 is mounted on the upper holding part 43 of the transfer carriage 40 and transferred to the demolding stage 3 while being transferred to the demolding stage 3. After molding the outer layer rubber A 1 on the lower mold 8 at the first molding stage 1, the lower mold 8 passes from the first molding stage 1 through the slide moving section 44 of the transfer carriage 40 on the lower mold moving stage 4. After being moved to the second molding stage 2 and returning the one lower die 8 to the first molding stage 1 by moving the transfer carriage 40 to the rear, another lower die 8 Is transferred from the second molding stage 2 to the upper holding section 43 of the transfer carriage 40 on the lower mold moving stage 4 and transferred to the demolding stage 3. In this manner, for each lower mold 8, molding of the outer rubber A 1 at the first molding stage 1, molding of the inner rubber A 2 at the second molding stage 2, and By continuously removing and removing the molded product in step 3, the two-layer structure bush A can be efficiently formed.

By doing so, the vulcanization molding of the outer rubber A 1 and the inner rubber A 2 can be performed. Even if the required time is the same as before, while the outer rubber A1 is being molded with one lower mold 8, the inner rubber A2 can be molded or the molded product can be removed with the other lower mold 8. As a result, the operating efficiency of each stage can be increased, and the manufacturing efficiency and productivity of the two-layer bush can be increased.

[Industrial applicability]

The molding die of the present invention is made of a rubber elastic material for the purpose of suppressing frictional noise and improving ride comfort on a two-layer structure bush used for a vehicle stabilizer bush, etc. Can be suitably used for manufacturing a bush having a two-layer structure of an inner layer rubber made of a rubber material having high slidability and an outer layer rubber made of a rubber material having higher rigidity and hardness than the inner layer rubber. The implementation of the bush can be facilitated, and the production efficiency can be increased.

Claims

Scope of request A mold for forming a two-layer bushing in which different types of inner and outer rubber layers are laminated.

A first upper die for forming an outer layer to which a nozzle of an injection machine for an outer rubber material is connected; a second upper die for forming an inner layer to which a nozzle of an injection machine for an inner rubber material is connected; and a bush to be formed A plurality of mold holes corresponding to the outer peripheral shape of the upper mold are provided on the upper surface side, and the first and second upper molds are provided so as to be able to be closed and joined with the respective upper molds. And

On the upper surface of the lower mold, an injection gate is connected to a sprue that vertically penetrates the upper mold at the time of joining the first upper mold, and into the cavity for the outer layer rubber in each mold hole. The first upper mold is formed such that a sprue portion and a runner portion of the outer layer rubber are left on the upper surface of the lower mold by the releasing action of the first upper mold, and the lower surface of the second upper mold is provided on the lower surface of the second upper mold. A mold for forming a two-layered bush, comprising a recess capable of accommodating at least a part of the remaining outer layer rubber sprue.

The first upper mold is supported movably up and down on a first molding stage for molding the outer layer rubber, and the second upper mold is supported movably up and down on a second molding stage for molding the inner layer rubber. The lower mold is movable from a lower corresponding position of the first upper mold to a lower corresponding position of the second upper mold, and at each position, the first and second upper molds are lowered. 2. The molding die for a two-layer structure bush according to claim 1, wherein the upper and lower dies are provided so as to be closed and joined to each other.

The second upper mold is composed of two upper and lower plates which are separated from each other, and a runner is formed between the upper and lower plates so as to be continuous with a sprue vertically penetrating the upper plate. The lower plate has the runner A second sprue is provided continuously to the cavity for molding the inner layer rubber in each of the mold holes, leading to an injection gate from above, and the sprue of the inner layer rubber is formed by a separating action of both upper and lower plates. The two-layer structure push molding die according to claim 1 or 2, wherein a part and a part of the runner are left on the lower plate.

The lower surface of the first upper mold has a first middle part which forms a cavity for an outer layer rubber with the inner peripheral surface of the mold hole by being inserted into the mold hole when the mold is closed and joined to the lower mold. Child pin is protruded,

Further, a cavity for the inner rubber is formed on the lower surface of the second upper mold between the outer rubber in the mold hole by being inserted into the mold hole when the mold is closed and joined to the lower mold. The molding die for a two-layer structure bush according to claim 1 or 2, wherein a second core pin is provided so as to protrude.