JP4026154B2 - Die set guide post positioning structure - Google Patents

Description

  The present invention relates to a guide post positioning structure for ensuring the relative position accuracy of an upper die and a lower die of a die set, and in particular, ensuring the above relative position with high accuracy even when molding a deformed molded product. The present invention relates to a guide post positioning structure of a die set that can be used.

  The structure of a conventional die set will be described with reference to FIG. In this figure, the upper mold 51 and the lower mold 52 of the die set 50 are provided with clampers 53 for holding respective molds (not shown) at predetermined positions. 8 shows only one side as a representative), the upper die 51 is provided with a bush holder 54, the lower die 52 is provided with a guide post 55, and the upper die 51 is moved up and down to face the lower die 52. In this case, the guide post 55 is inserted into the guide bush 56 provided in the bush holder 54 and slides, so that the relative positional accuracy between the upper mold 51 and the lower mold 52 is ensured.

  In such a structure, in order to obtain a molded product with good molding accuracy, it is extremely important to maintain the relative position of the upper die and the lower die with high accuracy. Is required to be performed in a straight line without shaking from side to side.

  However, for example, there are a large number of irregularly shaped molded products such as knuckle spindles or front wheel axle arms in automobile parts. When such a molded product is press-molded, the upper die is shaken with respect to the lower die after the start of pressing until the die reaches the bottom dead center until the guide reaches the bottom dead center. As a result of a lateral load acting during the sliding between the bush and the guide post, the guide bush and the guide post are loose, resulting in a defective product with poor molding accuracy.

  Therefore, referring to the literature related to the positioning structure of the guide post as described above, in Patent Document 1, as shown in FIGS. 9A and 9B, the central axis of the substantially cylindrical guide post 63 is provided. A hollow cylindrical shape in which at least two traveling surfaces 64 that are parallel and orthogonal to the radius thereof are symmetrically arranged around the central axis, and a plate-like sliding member 62 is attached to the inner surface of the guide bush 61 A die set for a press die is disclosed in which the travel surface of the guide post 63 and the sliding surface of the sliding member 62 of the guide bush 61 face each other and slide in contact with each other. ing.

  In the invention of Patent Document 1 as described above, since the retainer conventionally used for improving the slidability between the guide post and the guide bush is constituted by a large number of ball retainers, The total area of point contact with the guide bush is small, so a large pressure is applied to each ball retainer, the guide post is scratched linearly, the lubricating film is cut, frictional heat is generated, and in the worst case In order to solve the problem of seizure. Therefore, in Patent Document 1, a plurality of plate-like sliding members 62 are fixed on the inner surface of the guide bush 61, and the plate-like sliding members 62 are formed on the running surface 64 formed on the outer periphery of the guide post 63. By sliding, the contact surface pressure at the time of sliding, which is insufficient with the conventional ball retainer, is secured.

  However, in the configuration disclosed in the above-mentioned Patent Document 1, long vertical running surfaces 64 are formed at a plurality of positions at equal intervals on the outer periphery of the guide post 63 (in Patent Document 1, one piece is used as an example). The guide posts 63 are configured such that the running surfaces are formed on the outer periphery of the guide post 6 and the sliding members 62 facing the respective running surfaces 64 are fixed to the inner surface of the guide bush 61. In addition, it takes time to process a large number of running surfaces 64, and to attach a plurality of sliding members 62 to the inner surface of the guide bush 61.

In addition, the conventional ball retainer or the sliding member disclosed in Patent Document 1 has a configuration in which a large number of ball retainers or sliding members are provided at substantially equal intervals on the entire outer periphery of the guide post. Then, it has only the effect of ensuring the contact surface pressure at the time of sliding for each individual guide post, and several guide posts of the die set act to align the entire die set. It is not a structure. Therefore, since it is necessary to ensure the sliding accuracy of the guide posts in an independent state in each guide post, there is a disadvantage that the structure of each guide post has to be complicated.
Japanese Patent Laid-Open No. 10-43823

  The present invention has been made in view of the above circumstances, and is easy to manufacture without having a complicated configuration, and even when the molded product has an irregular shape, the right and left directions of the die set are formed during the molding. Die-set guides that obtain molded products with good accuracy by ensuring the sliding performance of the guide posts by evenly resisting loads in all lateral directions as well as in the front-rear direction An object is to provide a post positioning structure.

In order to achieve the above object, the guide post positioning structure of the die set according to claim 1 of the present invention includes a lower mold and an upper mold that moves up and down to face the lower mold, and the upper mold moves downward. The guide post fixed to one of the lower mold and the upper mold is fitted into the guide bush of the bush holder provided on the other to ensure the relative positional accuracy between the lower mold and the upper mold. In the guide post positioning structure of the die set,
The outer periphery of the upper die or the lower die guide post that is fixed in place to the left and right is formed a large diameter portion which is slightly larger in diameter than the guide post holder, a plane at right angles to one another on the outside of the large diameter portion A guide liner is formed on each of the pair of plates fixed to each mounting surface, and the guide liner of each plate is fixed in a state of being fitted in a guide groove formed on each mounting surface. A pair of plates perpendicular to each other along the outside of the guide post are attached vertically,
In the upright portions of the bush holders arranged and fixed to the left and right of the upper die or the lower die corresponding to the fixing positions of the left and right guide posts, planar upright surfaces that are perpendicular to each other are formed on the inside. A guide liner is formed on each of the pair of plates to be fixed to the rising surface, and the guide liners of each plate are fixed in a state of being fitted in the guide grooves formed on the respective rising surfaces, so that the inside of the bush holder is aligned. A pair of plates at right angles to each other are mounted vertically,
Between the beginning per mold provided in said lower die and said upper mold until the bottom dead center, the guide post of the pair of plates and the bush holder of the pair of plates and is sliding in surface contact with each other It is a structure which moves.

According to a second aspect of the present invention, in the first aspect, an oil groove filled with lubricating oil is provided on the sliding surface side of the pair of plates of the guide post and the pair of plates of the bush holder. The lubricating oil is supplied into the oil groove of each plate of the bush holder from the oil circulation hole penetrating the standing upper surface of the bush holder through the oil hole provided in the lower end portion of the oil groove of each plate of the bush holder. It is characterized by flowing in.

  As described above, according to the guide post positioning structure of the die set of the present invention, a pair of plates mounted near the fixed positions of the guide posts fixed to the left and right of the upper mold or the lower mold and opposed to each other Can maintain a state of no movement even when a pressing force is applied from the left-right direction, the front-rear direction, or any lateral direction. The present invention prevents the guide bush from rattling by using such a pair of plates fixed to the left and right guide posts.

  That is, the structure in which the pair of plates of the guide post and the pair of bush holders, which are in sliding contact with each other in a surface contact state, slides in surface contact, cooperates at positions facing the left and right sides of the die set. As a result, a pair of left and right guide posts against a pressing force that swings the upper die with respect to the lower die of the die set in the left-right direction, the front-rear direction, or any lateral direction as in the case of forming a deformed molded product. Since the plate and the pair of plates of the bush holder resist each other with their respective surface pressures, it becomes possible to maintain the sliding motion of each guide post and the guide bush in a straight state without shaking, It is possible to mold the upper mold with respect to the lower mold while maintaining high accuracy.

  In the present invention, the combination of the pair of plates of the bush holder and the pair of guide posts is formed only on one side of the die set, and the synergistic effect of resisting on the left and right sides as described above is exhibited. However, in the present invention, a pair of plates that can resist the pressing force to swing the upper die with respect to the lower die of the die set in the left-right direction, the front-rear direction, or any lateral direction can be efficiently disposed on the left and right sides of the die set. By arranging them, an effective guide post positioning structure is achieved with a small number of parts.

  Embodiments of the present invention will be described below with reference to the drawings.

  The die set guide post positioning structure according to the present invention includes a lower die 2 and an upper die 3 that moves up and down opposite to the lower die 2 as shown in FIG. 1 or FIG. Accordingly, the guide post 4 fixed to one of the lower mold 2 and the upper mold 3 is fitted into the guide bush 6 of the bush holder 5 provided on the other to ensure the relative positional accuracy between the lower mold 2 and the upper mold 3. In the guide post positioning structure of the die set configured as described above, a pair of guide posts 4 and 4 that are fixed to the left and right of the upper die 3 or the lower die 2 and are attached to positions facing each other in the vicinity of the fixed positions of the guide posts 4 and 4 The plates 8PF and 8PR are vertically arranged at a predetermined angle, and the bushes are arranged and fixed on the left and right of the upper die 3 or the lower die 2 corresponding to the fixing positions of the left and right guide posts 4 and 4. A pair of holders 5 and 5 inside the rising surface 7 The plates 8BF and 8BR are vertically mounted at a predetermined angle, and from the beginning of the die (not shown) provided on the upper die 3 and lower die 2 of the die set to the bottom dead center. In the meantime, the pair of plates of the guide posts 4 and 4 and the pair of plates of the bush holders 5 and 5 are configured to slide in surface contact with each other.

  FIG. 1 is a plan view illustrating the lower mold 2 with its upper surface looking down, and FIG. 2 is a plan view illustrating the upper mold 3 with its lower surface turned upside down. In the present embodiment, as shown in these drawings, a type using three guide posts 4 in one die set is given as an example. However, the present invention has at least two guide posts on the left and right. Any die set provided with 4, 4 and two bush holders 5, 5 and guide bushes 6, 6 is applicable.

  In this embodiment, the combination of the guide post 4 and the bush holder 5 is configured such that the bush holder 5 is provided on the upper die 3 and the guide post 4 is provided on the lower die 2. The guide post 4 and the bush holder 5 can be applied even if they are provided upside down.

  The lower mold 2 shown in FIG. 1 is provided with a horizontally long fixed clamper 9 on the rear side and a plurality of movable clampers 11, 11... That are movable on the front side by a hydraulic cylinder 10 as means for clamping a mold (not shown) in the front-rear direction. It has been. Further, as means for clamping the mold in the left-right direction, a fixed clamper 12 is provided on the right side of the figure, and a movable clamper 14 that is movable by a hydraulic cylinder 13 is provided on the left side of the figure. The lower ends of the molds are clamped by claws 9a and 11a provided on the respective clampers, and the molds can be reliably held by pressing the hydraulic cylinders 10 and 13. These clampers are similarly provided on the upper die 3 shown in FIG. 2 in correspondence with those provided on the lower die 2 described above.

  Moreover, in the lower mold | type 2 shown in FIG. 1, the guide post 4F provided in one front edge part is a normal structure, Corresponding to this, one front side provided in the upper mold | type 3 of FIG. The guide bush 6F also has a normal configuration.

  Furthermore, in the lower mold | type 2 shown in FIG. 1, the guide posts 4 and 4 provided in the left and right both ends of the back side are set as the symmetrical structure. The guide post 4 will be described with reference to FIGS. 3 and 4. As shown in FIG. 3 (a), a post mounting hole 26 (see FIG. 4), a cylindrical guide post holder 27 is formed. A tapered shape 28 is formed on the outer periphery of the upper end of the guide post 4, and a large-diameter portion 29 having a slightly larger diameter than the guide post holder 27 is formed in the vicinity of the guide post holder 27. On the outside of 29, planar mounting surfaces 30, 30 are formed at right angles to each other.

  In addition, guide grooves 29a are formed in the mounting surfaces 30 and 30 in the lateral direction, and guide liners 8b provided on the plate 8 similar to the above are fitted into the guide grooves 29a and 29a, respectively. By screwing the screws 8a into the screw holes 8c formed at the four corners and the screw holes 30a of the mounting surfaces 30 and 30 of the guide post 4, the pair of plates 8 and 8 are perpendicular to each other as shown in FIG. (See FIG. 1).

  As shown in FIG. 4, when the guide post holder 27 of the guide post 4 as described above is inserted into the left and right post mounting holes 26 of the lower mold 2, the left and right guide posts 4, 4 are firmly fixed, The fixing location of the pair of plates 8 and 8 is located in the vicinity of the post mounting hole 26, and the pair of plates 8 and 8 can maintain a state of no movement even when a pressing force from any lateral direction acts. it can. In the present invention, rattling of the guide bushes 6 and 6 is prevented using the pair of plates 8 and 8 fixed to the guide posts 4 and 4 fixed to the left and right of the lower mold 2 in this way.

  As shown in FIG. 3B, each plate 8 of the guide post 4 is provided with a V-shaped oil groove 22 and an oil hole 23 at the lower end thereof. The post 4 is not formed with an oil circulation hole 24 provided in the bush holder 5 to be described later, and the lubricating oil supplied from the bush holder 5 side is received by the oil groove 22 of each plate 8 of the guide post 4. I have to.

  In the upper mold 3 shown in FIG. 2, the guide bushes 6 and 6 provided at the left and right ends on the rear side are formed on the bush holders 5 and 5 having a symmetrical shape. Each of the bush holders 5, 5 has an upright portion 5 a on the inner side, and planar upright surfaces 7, 7 that are perpendicular to each other are formed on the guide bush 6 side of the upright portion 5 a. , 7 is attached with a pair of plates 8 and 8 with screws 8a arranged at the four corners.

  The bush holder 5 will be described with reference to FIG. 5 or FIG. 6. A cylindrical guide bush holder 15 is formed in the lower portion of the bush holder 5. A hollow cylindrical shape is formed in the guide bush holder 15 in the vertical direction. The guide bush 6 is provided, and an upright portion 5 a is formed at the upper end of the bush holder 5. On the side of the guide bush 6 of the upright portion 5a, planar upright surfaces 7 and 7 forming a predetermined angle α (see FIG. 6A) are formed, and the upright surfaces 7 and 7 are substantially in the vertical position. Guide grooves 7a, 7a are formed in the center in the lateral direction.

  In the present embodiment, it is preferable that the predetermined angle α of the rising surfaces 7 and 7 of the bush holder 5 and the pair of plates 8 and 8 fixed thereto is a right angle. By doing so, as will be described later, an equal resistance force is exerted against the pressing force for swinging the upper mold 3 relative to the lower mold 2 of the die set in the front-rear direction, the left-right direction, or any lateral direction. .

  As shown in FIG. 4, such a bush holder 5 is inserted with a guide bush mounting sleeve 18 having a flange 17 that engages with an inner peripheral step 16 formed on the inner peripheral side of the guide bush holder 15. In this state, the guide bush holder 15 is inserted into the bush mounting holes 19 provided at the corners of the upper mold 3, and the female screw 18 a provided on the outer periphery of the upper end of the bush mounting sleeve 18 is inserted into the upper mold 3. It is fixed to the upper die 3 by screwing a large-diameter nut 20 into the female screw 18a in a state exposed in the upper end recess. Further, the bolt 5c (see FIG. 1) is inserted into the bolt holes 5b provided at the four corners of the bush holder 5 shown in FIGS. 5 and 6, and is fixed by screwing into the predetermined screw holes of the upper die 3. The

  On the other hand, as shown in FIGS. 5 (a) and 5 (b), the plate 8 is made of a rectangular steel plate, and a guide liner 8b extending across the width is formed in a protruding shape at the center of the back surface of the plate 8. Is fixed to the vertical surfaces 7 and 7 of the bush holder 5 which are perpendicular to each other, the guide liner 8b of the plate 8 is fitted into the guide groove 7a of the bush holder 5 and formed in the four sides of the plate 8. The screw 8a is screwed into the screw hole 8c, and is fixed by screwing into the screw hole 7c of the rising surfaces 7 and 7 of the bush holder 5 formed at the corresponding positions.

  Each plate 8 is provided with a V-shaped oil groove 22, and an oil flow hole formed in communication with the rising surface 7 of the bush holder 5 through an oil hole 23 that penetrates the lower end of the oil groove 22. The lubricating oil such as grease flows into the oil groove 22 from 24 (see FIG. 6A). As shown in FIG. 6A, the oil circulation hole 24 penetrates through the bush holder 5, and lubricating oil is supplied through a pipe line (not shown) connected to the oil circulation hole 24. .

  7 (a), 7 (b) and 7 (c) show a state before the guide post 4 is inserted into the guide bush 6 of the bush holder 5 configured as described above, a state during insertion, and a state where the guide post 4 is inserted. FIG. When the upper die 3 of the die set is lowered to face the lower die 2, the pair of plates 8BF and 8BR of the bush holder 5 starts to slide while being aligned with the pair of plates 8PF and 8PR of the guide post 4. (State of FIG. 7 (a)), from the start of the upper die 3 and lower die 2 (not shown) to the bottom dead center (state of FIG. 7 (b)) (FIG. 7 (c)) Between the pair of plates 8BF and 8BR of the bush holder 5 and the pair of plates 8PF and 8PR of the guide post 4 are in contact with each other during the state) To do.

  When the plates 8PF and 8BF of the bush holder 5 facing each other and the plates 8PR and 8BR of the guide post 4 come into contact with each other in this way, the lubricating oil in the oil groove 22 provided in the plates 8BF and 8BR of the bush holder 5 is guided. It moves to the oil groove 22 provided in the plates 8PF and 8PR of the post 4 and enters the contact surfaces of the plates 8PF and 8BF and the plates 8PR and 8BR that slide with each other, so that the sliding can be performed smoothly. It becomes possible.

  The height and the vertical width h of the plate 8 (8PF, 8PR, 8BF, 8BR) attached to the guide post 4 and the bush holder 5 are as described above from the beginning of the upper die 3 and lower die 2 hitting the die. Before reaching the bottom dead center, the surfaces of the pair of plates 8BF and 8BR of the bush holder 5 and the pair of plates 8PF and 8PR of the guide post 4 need to satisfy the relationship of sliding in contact with each other. is there. That is, the vertical width of each of the plates 8PF, 8PR, 8BF, and 8BR is substantially equal to the width from the beginning of the upper mold 3 and lower mold 2 to the bottom dead center.

  As in the above configuration, the combination of the pair of plates 8BF and 8BR of the bush holder 5 and the pair of plates 8PF and 8PR of the guide post 4 that are in sliding contact with each other is between the left and right sides of the die set. Since they are provided at opposing positions, the combination of the pair of plates 8BF and 8BR of the left and right bush holders 5 and the pair of plates 8PF and 8PR of the guide post 4 interacts with each other so that each guide post 4 and guide bush It is possible to ensure the sliding motion with 6 in a straight state without shaking.

  To describe this effect in more detail, when a vibration that presses the upper mold 3 in FIG. 2 to the left occurs during molding by the mold, the pair of plates 8BF and 8BR of the left bush holder 5 in FIG. The pair of plates 8PF and 8PR of the guide post 4 are pressed. When the pair of plates 8PF and 8PR of the guide post 4 exerts a resistance force, the upper die 3 does not move and the left and right guide posts 4 and 4 are not displaced. It slides linearly in the left and right guide bushes 6,6. On the other hand, when a vibration that presses the upper die 3 in FIG. 2 in the right direction occurs, the pressing force that the pair of plates 8BF and 8BR of the right bush holder 5 acts in the right direction in FIG. When the pair of plates 8PF, 8PR of the guide post 4 resists, the upper mold 3 does not move and the left and right guide posts 4, 4 slide linearly in the left and right guide bushes 6, 6.

  Further, when the die set is shaken to press the upper die 3 (see FIG. 2) in the backward direction, the pressing force applied by the front plates 8BF and 8BF of the left and right bush holders 5 and 5 is applied to the left and right guide posts. When the front plates 8PF and 8PF of 4 and 4 are resisted, the upper mold 3 does not move and the left and right guide posts 4 and 4 slide linearly in the left and right guide bushes 6 and 6, respectively. On the other hand, when a deflection that presses the upper die 3 (see FIG. 2) of the die set forward occurs, the pressing force applied by the rear plates 8BR and 8BR on the left and right bush holders 5 and 5 is applied. When the plates 8PR and 8PR on the rear side of the guide posts 4 and 4 are resisted, the left and right guide posts 4 and 4 slide linearly in the left and right guide bushes 6 and 6 without the upper die 3 being displaced.

  Furthermore, even when the die set upper die 3 is shaken in any lateral direction such as an oblique direction, a pair of plates 8PF and 8PR of the left and right guide posts 4 and 4 and a pair of plates 8BF of the bush holder 5 are formed. , 8BR are fixed at right angles to each other, thereby exerting resistance in all lateral directions, so that the upper mold 3 does not move and the left and right guide posts 4, 4 are left and right guide bushes 6. , 6 slides linearly.

  The guide post positioning structure of the die set according to the present invention includes a plate that can resist a pressing force for swinging the die set in the left-right direction, the front-rear direction, or any lateral direction, as in the case of pressing a deformed molded product. By arranging without waste, it can be used as a guide post positioning structure capable of positioning the upper die with respect to the lower die with a small number of parts and with high accuracy.

It is a top view which shows the upper surface of the lower mold | type which concerns on the Example by this invention. It is a top view which shows the lower surface of the upper mold | type which concerns on the Example by this invention. (a) is a disassembled perspective view of the guide post based on the Example by this invention, (b) is the assembly perspective view. It is sectional drawing which shows the state which combined the guide post and bush holder which concern on the Example by this invention. (a) is a disassembled perspective view of the bush holder which concerns on the Example by this invention, (b) is the assembly perspective view. (a) is a top view of the bush holder which concerns on the Example by this invention, (b) is a side view of the bush holder. (A)-(c) is a perspective view which shows the state in which the guide post which concerns on the Example by this invention is inserted in the guide bush, the state during insertion, and the state after insertion. It is sectional drawing which shows the combination of the upper mold | type and lower mold | type of the conventional die set. (a) is an end view showing the combination of the guide post and guide bush of Patent Document 1, and (b) is a side view of the guide post.

Explanation of symbols

2 Lower mold 3 Upper mold 4 Guide post 4F Front guide post 5 Bush holder 5a Upright portion 5c Bolt 6 Guide bush 6F Front guide bush 7 Vertical surface 7a Guide groove 7c Screw hole 8BF Bush holder front plate 8BR Bush holder rear Side plate 8PF Front post plate 8PR Guide post rear plate 8a Screw 8b Guide liner 8c Screw hole 9 Fixed clamper 10 Hydraulic cylinder 11 Movable clamper 12 Fixed clamper 13 Hydraulic cylinder 14 Movable clamper 15 Guide bush holder 16 Inner peripheral step 17 Flange 18 Guide bush mounting sleeve 18a Female thread 19 Bush mounting hole 20 Nut 22 Oil groove 23 Oil hole 24 Oil flow hole 26 Post mounting hole 27 Guide post holder 28 Taper shape 29 Large diameter portion 29a Guide groove 3 0 Mounting surface 30a Screw hole

Claims (2)

A bush holder provided with a lower die and an upper die that moves up and down opposite to the lower die, and a guide post fixed to one of the lower die or the upper die as the upper die is lowered. In the guide post positioning structure of the die set that is fitted into the guide bush to ensure the relative positional accuracy between the lower mold and the upper mold,
The outer periphery of the upper die or the lower die guide post that is fixed in place to the left and right is formed a large diameter portion which is slightly larger in diameter than the guide post holder, a plane at right angles to one another on the outside of the large diameter portion A guide liner is formed on each of the pair of plates fixed to each mounting surface, and the guide liner of each plate is fixed in a state of being fitted in a guide groove formed on each mounting surface. A pair of plates perpendicular to each other along the outside of the guide post are attached vertically,
In the upright portions of the bush holders arranged and fixed to the left and right of the upper die or the lower die corresponding to the fixing positions of the left and right guide posts, planar upright surfaces that are perpendicular to each other are formed on the inside. A guide liner is formed on each of the pair of plates to be fixed to the rising surface, and the guide liners of each plate are fixed in a state of being fitted in the guide grooves formed on the respective rising surfaces, so that the inside of the bush holder is aligned. A pair of plates at right angles to each other are mounted vertically,
Between the beginning per mold provided in said lower die and said upper mold until the bottom dead center, the guide post of the pair of plates and the bush holder of the pair of plates and is sliding in surface contact with each other A die set guide post positioning structure characterized by having a moving structure. An oil groove filled with lubricating oil is provided on the sliding surface side of the pair of plates of the guide post and the pair of plates of the bush holder, and is provided at the lower end of the oil groove of each plate of the bush holder. it was through the oil hole according to claim 1, characterized in that so as to flow into the lubricating oil in the oil groove of each plate of the bushing holder from pierced oil distribution hole to raised surface of the bush holder Die set guide post positioning structure.