KR102021528B1 - Undercut processing mechanism, molding die and molded product - Google Patents

Abstract

An undercut processing mechanism having a molding core for molding an undercut portion, which is mounted and used in a molding die for molding a molded article having an undercut portion, which moves in a direction inclined with respect to the mold opening direction of the molding die when the mold is taken out of the molded article. And a guide means for guiding the movement of the inclined pin, wherein the inclined pin has a sliding portion sliding in contact with the guide means. In order to regulate the moving direction of the pin, it is formed in the shape which contact | connects the said sliding part over the whole stroke of the said inclined pin, and is formed in the shape with the big bending rigidity with respect to the specific direction in the said sliding part.

Description

Undercut Treatment Mechanism, Molds for Molding and Molded Products {UNDERCUT PROCESSING MECHANISM, MOLDING DIE AND MOLDED PRODUCT}

TECHNICAL FIELD The present invention relates to an undercut processing mechanism, a molding die, and a molded article which are mounted and used in a molding die for molding a molded article having an undercut portion.

BACKGROUND OF THE INVENTION In a molding die for molding a molded article having an undercut portion, many undercut treatment mechanisms have been developed in a form corresponding to the shape of the undercut portion. Some undercut processing mechanisms are called so-called loose core structures.

The conventional representative loose core structure consists of a block called a loose core (or forming core) for forming an undercut portion, an inclined pin for connecting to the loose core, and a slide unit for connecting to the end of the inclined pin. The slide unit is included in the ejector plate, and when the ejector plate is moved in the mold ejection direction, the slide unit moves in the ejecting direction of the undercut portion in association with the ejector plate, whereby the loose core moves through the inclined pin to the ejector plate. It moves in a pulling-out direction, and it becomes possible to pull out a loose core from an undercut part.

In the loose core structure having the above-described configuration, it is pointed out that the load and the bending moment are concentrated at the proximal end of the inclined pin, and the deformation and breakage are caused in the inclined pin, especially when a slide or slip occurs in the slide unit. have. In addition, as the angle of inclination of the inclined pin increases, the load on the inclined pin increases and deformation or breakage tends to occur. Therefore, the inclined pin is used at an inclined angle close to the upright, and the stroke of the ejector plate is increased to remove the large undercut portion. It has been necessary to make the apparatus larger in size.

In order to solve the above problem, a loose core structure is proposed which reinforces an inclined pin by using a guide rod having the same inclined angle as the inclined pin and a slide base (slide unit) connecting the inclined pin to the guide rod (Example For example, see patent document 1: Unexamined-Japanese-Patent No. 7-32370. The loose core structure described in Patent Literature 1 is configured so that the load and the bending moment are not concentrated on the inclined pin by receiving the load and the bending moment of the guide rod, thereby preventing deformation and breakage of the inclined pin.

However, there are disadvantages in that the structure is complicated compared to the conventional loose core structure, and the required space is increased by adding the guide rod. In order to solve this problem, a mold including a further improved loose core structure has been proposed (for example, Patent Document 2: Japanese Patent Laid-Open No. 2003-320561, Patent Document 3: Japanese Patent Laid-Open No. 2007-283746). Publication).

The loose core structure employed in the molding die described in Patent Literature 2 is provided with a guide member in sliding contact with a rod holder connected to the end of the inclined pin, and a load applied to the inclined pin at the time of mold clamping. And a simple configuration in which the bending moment is received by the guide member, thereby avoiding an increase in the size and weight of the device. According to this structure, it is possible to reinforce the inclined pin at the time of mold tightening, but the load and bending moment applied to the inclined pin at the time of mold opening, especially when the loose core is slipped or caught when the loose core is removed from the undercut portion. Reinforcement cannot be performed.

The loose core structure employed in the molding die described in Patent Literature 3 provides a guide sleeve through which the inclined pin is slidably inserted, and arranges the inclined pin and the guide sleeve coaxially. It is to realize space saving and structure simplification. According to this structure, space saving can be realized while reinforcing the inclined pin by the guide sleeve, but it is considered that the allowable load and the bending moment are small compared with the loose core structures of Patent Documents 1 and 2.

An object of the present invention is to provide an undercut treatment mechanism, a molding die and a molded article which can secure sufficient mechanical strength against load and bending moment while realizing space saving.

The undercut treatment mechanism of the present invention is an undercut treatment mechanism having a molding core for molding an undercut portion, which is mounted and used in a molding die for molding a molded article having an undercut portion. An inclined pin which moves in the inclined direction with respect to the direction and withdraws said forming core from the undercut portion, and guide means for guiding the movement of said inclined pin, said inclined pin having a sliding portion sliding in contact with said guide means. The guide means is formed in a shape in contact with the sliding portion over the entire stroke of the inclined pin to regulate the moving direction of the inclined pin, and further has a large bending rigidity with respect to a specific direction in the sliding portion. It is formed in a shape.

Moreover, in this invention, it is preferable that the said guide means is formed in the shape where the bending rigidity with respect to the specific direction in the said sliding part is large compared with the case where at least one part is a cylinder or a cylinder which has a slit in one part.

Moreover, in this invention, it is preferable that the said guide means has one or more planes on the outer peripheral surface.

Moreover, in this invention, it is preferable that the said guide means has one or more wavefronts in the outer peripheral surface.

Moreover, in this invention, it is preferable that the said guide means has one or more curved surfaces on the outer peripheral surface.

Moreover, in this invention, the said sliding part and the said guide means respectively have the sliding surface parallel to the moving direction of the inclined pin which contacts and mutually slides, and the said sliding surface is seen from a cross section. It is preferable that one part or all part is a straight line.

Moreover, in this invention, it is preferable that the said sliding surface is a straight line which is part or all orthogonal or parallel with respect to the moving direction of the said molding core in the cross section.

Moreover, in this invention, it is preferable that the said guide means consists of a several member which has a sliding surface which slides with the said sliding part, and sandwiches at least one part of the said sliding part, and is restrained mutually.

In addition, in the present invention, the inclined pin includes a pin body whose one end is connected to the molding core and the other end is connected to the sliding part, and the pin body has both ends, It is preferable to have male or female threads which are inverse threads, respectively.

In the present invention, it is preferable that the guide means has a dovetail groove, and the guide means guides the sliding part through the dovetail groove.

Moreover, this invention is a shaping | molding die containing the said undercut processing mechanism.

Moreover, this invention is a molded article shape | molded by the said undercut processing mechanism or the said molding die.

Any combination of at least two configurations disclosed in the claims and / or in the specification and / or drawings is included in the present invention. In particular, any combination of two or more of each claim in the claims is included in the present invention.

The present invention will be more clearly understood from the following description of the preferred embodiments with reference to the attached drawings. However, embodiments and figures are for illustration and description only, and should not be used to define the scope of the invention. The scope of the invention is defined by the appended claims (claims). In the accompanying drawings, the same reference numerals in the plurality of drawings denote the same parts.
1: is a longitudinal cross-sectional view when seen from the front of the shaping | molding die 1 of 1st Embodiment of this invention.
FIG. 2 is a longitudinal sectional view showing a state after the protruding operation of the molding die 1 of FIG. 1.
FIG. 3 is a perspective view of the front side of the ejector plate 10 and the undercut processing mechanism 11 of the molding die 1 of FIG. 1.
4 is a perspective view of the back side of the ejector plate 10 and the undercut processing mechanism 11 of the molding die 1 of FIG. 1.
5 is a cross-sectional view taken along the cutting line AA of FIG. 4.
FIG. 6 is an enlarged perspective view of a main part of the undercut processing mechanism 11 of the molding die 1 of FIG. 1.
FIG. 7: is a perspective view of the front side of the undercut processing mechanism 12 and the ejector plate 10 of 2nd Embodiment of this invention.
FIG. 8 is a perspective view of the undercut treatment mechanism 13 and the ejector plate 10 of the third embodiment of the present invention as viewed from below.
9 is a cross-sectional view of the cut line BB of FIG. 8.
FIG. 10 is a perspective view of the undercut treatment mechanism 14 and the ejector plate 10 of the fourth embodiment of the present invention, as viewed from below.
FIG. 11 is a cross-sectional view of the cut line CC in FIG. 10.
12 is an enlarged perspective view of an essential part of the undercut processing mechanism 15 according to the fifth embodiment of the present invention.
13 is an enlarged perspective view of a main part of the undercut processing mechanism 16 according to the sixth embodiment of the present invention.
FIG. 14: is a longitudinal cross-sectional view seen from the front of the shaping | molding die 7 of 7th Embodiment of this invention.
FIG. 15: is the figure which looked at the 1st specific example of the shape of the sliding part (slide block) and the guide means (guide rail) of the inclination pin of the undercut processing mechanism of this invention from the same viewpoint as FIG.
FIG. 16: is the figure which looked at the 2nd specific example of the shape of the sliding part (slide block) and the guide means (guide rail) of the inclination pin of the undercut processing mechanism of this invention from the same viewpoint as FIG.
FIG. 17 is a view of a third specific example of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention, as viewed from the same viewpoint as in FIG. 5.
FIG. 18 is a view showing the fourth specific example of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut treatment mechanism of the present invention as viewed from the same viewpoint as in FIG. 5.
FIG. 19 is a view of the fifth specific example of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention as viewed from the same viewpoint as in FIG. 5.
FIG. 20 is a view of the sixth specific example of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut treatment mechanism of the present invention as viewed from the same viewpoint as in FIG. 5.
FIG. 21 is a view of the seventh specific example of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention, as viewed from the same viewpoint as in FIG. 5.
FIG. 22 is a view of an eighth specific example of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut treatment mechanism of the present invention, as viewed from the same viewpoint as in FIG. 5.
It is a figure which looked at the 9th specific example of the shape of the sliding part (slide block) and the guide means (guide rail) of the inclination pin of the undercut processing mechanism of this invention from the same viewpoint as FIG.
FIG. 24 is a view of the tenth specific example of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention as viewed from the same viewpoint as in FIG. 5.
FIG. 25 is a view of an eleventh specific example of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention, as viewed from the same viewpoint as in FIG. 5.
26A and 26B show the twelfth and thirteenth examples of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention, as viewed from the same point in time as in FIG. Drawing.
27A and 27B show the 14th and 15th examples of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention, as viewed from the same point in FIG. Drawing.
28A and 28B show the sixteenth and seventeenth embodiments of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention, as viewed from the same point in time as in FIG. Drawing.
29A and 29B show the eighteenth and nineteenth specific examples of the shapes of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention, as viewed from the same point in time as in FIG. Drawing.
30A and 30B show the twentieth and twenty-first specific examples of the shapes of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention, as viewed from the same viewpoint as in FIG. Drawing.
FIG. 31 is a view of a twenty-second specific example of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention, as viewed from the same viewpoint as in FIG. 5.
FIG. 32 is a view of a twenty-third example of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention, as viewed from the same viewpoint as in FIG. 5.
33A and 33B show the twenty-fourth and twenty-fifth embodiments of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention, as viewed from the same point in time as in FIG. Drawing.

FIG. 1: is a longitudinal cross-sectional view when seen from the front of the molding die 1 of 1st Embodiment of this invention, and FIG. 2 is a longitudinal cross-sectional view which shows the state after the protrusion operation of the molding die 1 of FIG. . 3 is a perspective view of a front side of the ejector plate 10 and the undercut treatment mechanism 11 of the molding die 1 of FIG. 1, and FIG. 4 is an ejector plate 10 of the molding die 1 of FIG. 1. ) And a perspective view of the back side of the undercut processing mechanism 11, FIG. 5 is a sectional view of the cutting line AA of FIG. 4, and FIG. 6 is an enlarged main part of the undercut processing mechanism 11 of the molding die 1 of FIG. 1. Perspective view.

In addition, in FIG. 1 and FIG. 2, the ejector plate 10 and the undercut processing mechanism 11 are shown in front view, and hatching is abbreviate | omitted. In addition, in FIG. 1 thru | or FIG. 3, the one guide rail 44b of the undercut processing mechanism 11 is abbreviate | omitted, and in FIG. 4, one guide rail 44a of the undercut processing mechanism 11 is shown as an imaginary line. In FIG. 5, the sliding surface is shown by the thick line, and the ejector plate 10 is abbreviate | omitted. In addition, in this description, the molded article P side in FIG. 1 and the ejector plate 10 side will be down.

The shaping | molding die 1 of 1st Embodiment of this invention is a metal mold | die which is contained in the shaping | molding die apparatus (not shown), and shape | molded the molded article P with the undercut part P1. The molded article P has an undercut portion P1 protruding inward from a part of the edge of the tray-shaped molded article P3.

The molding die 1 is fixed to the stationary side plate 3 fixed to the stationary side mounting plate 2 of a molding die device (not shown), similarly to the configuration of a known molding die for molding a molded article having an undercut portion. And a movable mold (22) which is fixed to the movable mounting plate (24) of the mold apparatus for molding through a spacer block (23) and moves up and down. A core 21 which is inserted into and fixed to 22 and forms a molded article P, an ejector plate 10 that moves up and down with respect to the movable side template 22 to protrude the molded molded article P, The undercut processing mechanism 11 which performs the operation | movement which pulls out the undercut part P1 in connection with the ejector plate 10 at the time of protruding the molded article P is included.

The through hole 27 through which the pin body 42 of the inclined pin 41 of the undercut processing mechanism 11 which is mentioned later is penetrated by the core 21 and the movable side template 22 is drilled. In the conventional loose core structure, the inclined pin is guided by the through hole 27 or through a member such as a bushing attached to the through hole 27, but the molding die of the present embodiment ( In the undercut processing mechanism 11 of 1), the slide block 43 of the inclined pin 41 to be described later is guided by the guide rails 44a and 44b, so that the inclined pin 41 is guided to the through hole 27. No dimensional accuracy or member is needed. However, the structure in which the pin body 42 slides in the through hole 27 is not denied.

The ejector plate 10 is a flat plate member, and has an insertion hole 31 for inserting the guide rail 44a of the undercut processing mechanism 11 mentioned later. Although the description of the drive mechanism of the ejector plate 10 is omitted, the ejector plate 10 is moved on the movable side template (when ejecting the mold) at the time of the projecting operation after opening the mold (when the mold is taken out), similarly to the mechanism in the known molding die. 22) to rise relative to.

The undercut treatment mechanism 11 is connected to the molding core 40 for molding the molded article P, and is connected to the bottom surface of the molding core 40 to the mold fastening and mold opening direction of the molding die 1 in appearance. An inclined pin 41 reciprocating in the inclined direction, two guide rails 44a and 44b serving as a guide means for guiding the inclined pin 41, and a slide block at the proximal end of the inclined pin 41; Two slide plates 45a and 45b connected to 43 and reciprocating along the projecting direction of the undercut portion P1 (extraction direction, X direction in FIG. 5) in conjunction with the ejector plate 10, and the ejector plate ( A slide base 46 fixed to 10) and guiding the slide plates 45a and 45b, and two connecting pins 47a and 47b connecting the slide block 43 and the two slide plates 45a and 45b. Includes, in conjunction with the vertical movement of the ejector plate 10, the forming core 40 with respect to the molded product (P) The projecting direction of keotbu (P1) (left-right direction of Fig. 1, X direction in Fig. 5) is configured to reciprocate along the.

The molding core 40 forms the molded article P together with the core 21 (and the cavity 4 of the stationary side template 3) in order to form the undercut portion P1 of the molded article P and its vicinity. It is a block member processed into the shape along the shape.

The inclined pin 41 has the pin main body 42 which is an elongate round bar member, and the slide block 43 connected to the base end (lower end) of the pin main body 42, and the movement direction of the ejector plate 10 is carried out. The upper end of the pin body 42 is fixed to the bottom surface of the shaping core 40 in a state inclined with respect to.

In this undercut processing mechanism 11, the moving direction of the inclined pin 41 is regulated by the guide rails 44a and 44b. Therefore, the pin main body 42 needs only to be able to move inside the through-hole 27, and has high degree of freedom of a dimension and a shape. The pin body 42 is not limited to a round bar member, For example, a square bar member, a hexagonal bar member, etc. may be sufficient. In addition, the fixing method of the pin main body 42, the shaping | molding core 40, and the slide block 43 is not limited to a specific method, For example, screwing, press fitting, joining, etc. suitably This is done in an optimal way. In addition, the pin main body 42 and the slide block 43 do not need to be fixed to each other, for example, even if the pin main body 42 is connected with the slide block 43 so that rotation is possible. do.

The inclination angle (movement direction) of the inclined pin 41 is determined according to the stroke of the ejector plate 10 and the protruding length of the undercut portion P1. Specifically, the inclination angle of the inclined pin 41 is determined so that the molding core 40 moves to a position at which the molded article P can be pulled out immediately at least when the ejector plate 10 rises to the rising end. (See FIG. 2).

If the inclination angle of the inclination pins 41 is large, the stroke required for the pulling-out operation of the undercut portion P1 is small, but the load and bending moment applied to the undercut processing mechanism 11 are larger than in the case where the inclination angle is small. As will be described later, according to the undercut treatment mechanism of the present invention, since the mechanical strength of the guide rails 44a and 44b supporting the slide block 43, which is the point of the load and the bending moment, is large, the inclination angle is relatively high. It can be taken large.

The slide block 43 is a sliding part of the inclined pin 41 which slides in contact with two guide rails 44a and 44b, and becomes the point of the load and the bending moment applied to the inclined pin 41. The slide block 43 has a rectangular parallelepiped block portion and two protruding pieces 51a and 51b extending downward from a side of two opposite sides of the block portion at a constant thickness. It is upside down (see FIGS. 3 and 4). In the undercut processing mechanism 11 of the molding die 1 of this embodiment, the four side surfaces of the slide block 43 are the sliding surfaces which slide with the guide rails 44a and 44b.

The protruding pieces 51a and 51b are connected with the slide plates 45a and 45b through the connecting pins 47a and 47b. Therefore, the through pieces 52 for mounting the connecting pins 47 are formed in the protruding pieces 51a and 51b so as to face each other and coaxially, and the slide block 43 is the central axis of the through holes 52. It is fixed to the lower end of the pin main body 42 in the direction orthogonal to the protrusion direction (pull out direction) of this undercut part P1.

Each of the guide rails 44a and 44b is an elongated flat member having a cross-sectional U-shape with a guide groove 53 into which the slide block 43 is fitted, and sandwiches the slide block 43 with the guide groove 53. In one state, the inclined pin 41 is guided in the inclined direction through the slide block 43, and the load and the bending moment applied to the slide block 43 are supported. Each of the guide rails 44a and 44b is a sliding surface in which the bottom surface 61 and the side surface 62 of the guide groove 53 slide with each other with the sliding surface of the slide block 43, and the sliding surface is 90 degrees. It is arrange | positioned at a pitch, and the slide block 43 is formed so that a movement is possible without shaking.

The guide rails 44a and 44b have a bottom surface 61 of each guide groove 53 in contact with a side surface on which the protruding pieces 51a and 51b of the slide block 43 extend, and the side surface of the guide groove 53. The slide block 43 is sandwiched by the guide grooves 53 so that the 62 is in contact with the rest of the side surfaces, and inclined so that the long axis of the guide grooves 53 coincides with the central axis of the pin body 42 when viewed from the front. In the state, the upper end is fixed to the movable side template 22 and the lower end to the movable side mounting plate 24, respectively. In addition, the fixing method of the both ends of the guide rails 44a and 44b is not limited to a specific method, For example, it is suitable suitably, such as the method of fixing via a fixing block material (not shown). It is good to do it.

In addition, the two guide rails 44a and 44b are arrange | positioned so that the clearance gap 49 may be arrange | positioned so that the slide base 46 may be arrange | positioned. In addition, one guide rail 44a is inserted into the insertion hole 31 of the ejector plate 10. And, depending on the arrangement of the guide rails 44a and 44b with respect to the ejector plate 10, two insertion holes 31 are drilled in the ejector plate 10, and both guide rails 44a and 44b are inserted through the insertion holes. It may be inserted into (31).

In the molding die 1 of the present embodiment, in particular, when slipping or jamming occurs on the slide plates 45a and 45b, the moving direction of the forming core 40 (slide plates 45a and 45b) (Fig. 5). It is assumed that the load and the bending moment in the X direction are concentrated in the slide block 43. Therefore, in the guide rails 44a and 44b, the direction in which the width hx in the X direction is orthogonal thereto (the Z direction in FIG. 5) so that the bending rigidity (cross section secondary moment) in the X direction in the slide block 43 increases. It is formed to be larger than the width of hz.

And in the undercut processing mechanism 11 of the shaping | molding die 1 of this embodiment, when improving the bending rigidity of a X direction, only the width | variety hx of the X direction of the guide rails 44a and 44b may be extended, and a specific direction It is possible to achieve both an improvement in bending rigidity and a space saving. On the other hand, in the case where the member corresponding to the guide rails 44a and 44b is a cylinder or a cylinder having a slit in a part thereof, when the bending rigidity in the X direction is to be increased, the diameter is expanded not only in the X direction but in all directions. It is necessary to increase the area required for installation, which hinders space saving.

In the undercut treatment mechanism and the molding die of the present invention, the direction in which the bending rigidity is increased and the shape of the guide rail corresponding thereto are not limited to specific ones, and the width of the guide rail is in accordance with the direction in which the bending rigidity is increased. This can be done by expanding or determining the shape of the guide rail.

In addition, the side surface 62 (and the side surface of the slide block 43) which become the sliding surfaces of the guide rails 44a and 44b like this embodiment has the space | interval 49 of two guide rails 44a and 44b. When orthogonal to the empty X direction, even if a relatively large load and bending moment are applied in the X direction, no force is applied in the direction of extending the gap 49 between the two guide rails 44a and 44b. Therefore, the expansion of the space | interval 49 of the guide rails 44a and 44b, and the fall of the slide block 43 from the space | interval 49 are prevented, and it is preferable.

On the other hand, for example, when using a cylinder having a slit in part and guiding a cylindrical or cylindrical inclined pin to a member corresponding to the guide rail, when a load and a bending moment are applied in the radial direction toward the slit, A force is applied in the direction in which the slit extends, and the inclined pin may fall out of the slit due to the expansion of the slit.

In addition, the guide rails 44a and 44b do not interfere with the movement of the ejector plate 10, the inclined pin 41, and the slide base 46 in order to prevent the mutual space 49 from expanding. It is more preferable if it is mutually restrained by a fixture (not shown) etc.

The slide plates 45a and 45b are rectangular flat members which the through-hole 54 which mounts the connection pin 47 in the center, respectively, perforated. The slide plates 45a and 45b are connected to the inner side of the protruding pieces 51a and 51b of the slide block 43 via the connecting pins 47a and 47b and bearings (not shown). It is rotatably connected around the central axis.

The slide base 46 is an E-shaped rail-shaped cross section, and guide grooves 56a and 56b for guiding the slide plates 45a and 45b in the protruding direction (extraction direction) of the undercut portion P1 on both sides. Have Both side surfaces of the guide grooves 56a and 56b are in contact with the top and bottom surfaces of the slide plates 45a and 45b to slide with each other, and the slide plates 45a and 45b are formed to be movable without shaking.

The slide base 46 is arrange | positioned in the space | interval 49 of two guide rails 44a and 44b, and the both side surfaces of the guide grooves 56a and 56b are parallel with the protrusion direction (extracting direction) of the undercut part P1. It is fixed to the ejector plate 10 to be.

The fixing method of the slide base 46 is not limited to a specific method, For example, what is necessary is just to set it as an optimal method suitably, such as the method of using a press pin or a bolt, the method of direct press or joining.

And in the molding die 1 of this embodiment, since the direction of pull out of the undercut part P1 is a horizontal direction, the slide base 46 is also formed and arrange | positioned so that both sides of the guide grooves 56a and 56b may be horizontal. However, when the extraction direction of the undercut portion P1 is inclined with respect to the horizontal direction, the slide base 46 also has both sides of the guide grooves 56a and 56b parallel to the extraction direction of the undercut portion P1. Formed and placed.

The connecting pins 47a and 47b are cylindrical pin members, respectively, and one through hole 52 and one of the slide plates 45a and 45b of the protruding pieces 51a and 51b of the slide block 43. It has a length substantially equal to the total length of the through hole 54.

One connecting pin 47a is attached to each of the through holes 52 and 54 in a state where the inner surface of one protruding piece 51a of the slide block 43 and one slide plate 45a are in contact with each other. The other connecting pin 47b is connected to the through-holes 52 and 54 of the slide block 43 in a state where the inner surface of the protruding piece 51b on the other side and the slide plate 45b on the other side are in contact with each other. It is installed. In addition, the mounting method of the connection pins 47a and 47b is not limited to a specific method.

Next, the action of the molding die 1 of the present embodiment will be described. When the molding of the molded article P and the opening of the mold are completed, the protruding operation (molding operation) of the molded article P is started. 1 is a state before the protrusion operation. At the time of protruding of the molded article P, the ejector plate 10 raises. As the ejector plate 10 is raised, the slide block 43 is guided to the guide grooves 53 of the guide rails 44a and 44b, and the inclined pins 41 are raised in the inclined direction, whereby the slide plates 45a and 45b. ) Is guided to the guide grooves 56a and 56b of the slide base 46 to move in the protruding direction (the right direction in FIG. 1) of the undercut portion P1. That is, the movable part of the undercut processing mechanism 11 except the guide rails 44a and 44b and the slide base 46 is projected to the ejector plate 10 in the protruding direction of the undercut portion P1 (right direction in FIG. 1). Move.

Thereby, when the shaping | molding core 40 moves to the protrusion direction (outgoing direction) of the undercut part P1 with respect to the shaping | molding article P, and the ejector plate 10 raises to the rising end, the shaping | molding core 40 Is separated from the undercut portion P1, the extraction of the undercut portion P1 is completed, and the molded article P can be taken out (see FIG. 2).

When the ejector plate 10 descends, the movable part of the undercut processing mechanism 11 moves to the left direction with respect to the ejector plate 10, and when the ejector plate 10 descends to the lower end, it returns to the state of FIG.

In the shaping | molding die 1 of this embodiment, when the inclination pin 41 (ejector plate 10) moves, especially when the sliding plate 45a and 45b generate | occur | produce, the slide block 43 And a relatively large load and bending moment in the X direction are applied to the sliding portions of the guide rails 44a and 44b, but the guide rails 44a and 44b are formed in a shape having a large bending rigidity in the X direction and the slide block 43 Since it is supported by these guide rails 44a and 44b, it is hard to produce a deformation | transformation and a damage.

In addition, since both ends of the guide rails 44a and 44b are fixed and supported, deformation and damage are less likely to occur. Thereby, the problem of the shaping | molding die by the deformation | transformation or damage of the slide block 43 and the guide rail 44a, 44b, etc., and the shaping | molding defect of the molded article P are prevented.

As mentioned above, according to the shaping | molding die 1 of this embodiment, the other reinforcement member is added with respect to the load and the bending moment which apply to the inclined pin 41 (slide block 43) and the guide rails 44a and 44b. Without using it, a simple structure can secure sufficient mechanical strength. Thereby, the shaping | molding die 1 and the undercut processing mechanism 11 of this embodiment can be applied also to shaping | molding of a big heavy molded article, realizing space saving.

In addition, the inclination angle of the inclined pin 41 can be made relatively large by the improvement of the mechanical strength, and the degree of freedom when the undercut treatment mechanism 11 is applied to the molding die 1 is increased. In addition, since the load and bending moment applied to the inclined pin 41 are supported by the slide block 43 and the guide rails 44a and 44b, and the pin body 42 is not subjected to a large load and bending moment, the pin Since the degree of freedom of the shape of the main body 42 is increased and other reinforcing members for the pin main body 42 are unnecessary, the space saving of the undercut processing mechanism 11 and the molding die 1 and the simplification of the configuration are simplified. It is realized more.

In the molding die 1 of the present embodiment, a local load and a bending moment in a direction different from the X direction are applied to the slide block 43 or the guide rails 44a and 44b, and the slide block 43 ) Or when the guide rails 44a and 44b may be deformed, the cross-sectional area may be locally formed by overlaying or the like at a corresponding location (direction) of the guide rails 44a and 44b. It may increase and improve mechanical strength.

Moreover, according to the shaping | molding die 1 of this embodiment, the side surface 62 (and the side surface of the slide block 43) used as the sliding surface of the guide rail 44a, 44b has two guide rails 44a, 44b. Since the space | interval 49 of () is orthogonal to the X direction which is an empty direction, even if a comparatively large load and a bending moment are applied in the X direction, the direction which extends the space | interval 49 of two guide rails 44a and 44b is extended. Since no force is applied, the expansion of the gap 49 of the guide rails 44a and 44b and the drop of the slide block 43 from the gap 49 are prevented.

Moreover, according to the shaping | molding die 1 of this embodiment, since the inclination pin 41 can guide the whole stroke in the state which the guide rail 44a, 44b enclosed and contacted the slide block 43, it inclines Space saving can be realized as compared with the configuration using a guide shaft which is arranged to be arranged in parallel and spaced apart from the pins.

Moreover, according to the molding die 1 of this embodiment, the undercut processing mechanism 11 is comprised from the member of the shape which is easy to process, without using the member of a complicated shape, assembly is also simple, and a movable side Since mounting to the template 22 and the ejector plate 10 is also simple, cost reduction can be realized while ensuring the required precision.

FIG. 7: is a perspective view of the front side of the undercut processing mechanism 12 and the ejector plate 10 of 2nd Embodiment of this invention. In FIG. 7, one guide rail 44b is omitted. The same code | symbol is attached | subjected to the same structure as the molding die 1 of 1st Embodiment shown in FIG. 1 thru | or 6, and description is abbreviate | omitted. Although the undercut processing mechanism 12 of this embodiment has the same basic structure as the undercut processing mechanism 11 of the shaping | molding die 1 of 1st Embodiment, the form of the inclination pin 70 differs.

In the undercut processing mechanism 12 of the present embodiment, the pin body and the slide block of the inclined pin 70 are integrated with each other, specifically, the pin body in the form of extending the slide block 71 that is a rectangular rod member in cross section. Is formed, and the upper end is fixed to the lower surface of the forming core 40.

As described above, in the undercut treatment mechanism and the molding die of the present invention, it is also possible to integrate the pin body of the inclined pin and the slide block.

FIG. 8 is a perspective view of the undercut treatment mechanism 13 and the ejector plate 10 of the third embodiment of the present invention as viewed from below. 9 is a cross-sectional view taken along the line B-B of FIG. 8. 9, the sliding surface is shown by the thick line, and the ejector plate 10 is abbreviate | omitted. The same code | symbol is attached | subjected to the same structure as the molding die 1 of 1st Embodiment shown in FIG. 1 thru | or 6, and description is abbreviate | omitted.

The undercut processing mechanism 13 of the present embodiment has the same basic configuration as the undercut processing mechanism 11 of the molding die 1 of the first embodiment, but includes the inclined pin 80, the guide rail 82, and the slide. The shape of the base 83 and the length of the connecting pin 47 are different, and the guide rail 82, the slide plate 45, the connecting pin 47 is one each.

In the undercut processing mechanism 13 of this embodiment, the slide block 81 of the inclination pin 80 is a rectangular parallelepiped block member which does not have a protrusion piece, and the cross section C in which the guide rail 82 has the slit 85 is carried out. It is a rectangular cylindrical member, and is a rectangular parallelepiped block member in which the slide base 83 has one guide groove 56.

The slide block 81 is a rectangular parallelepiped block member in which R chamfering is performed at the short side of the lower surface, and is provided with a connecting pin (punched from the lower center of the side surface of the front side (slide base 83 side)). 47 has through holes (not shown) for mounting. The slide block 81 is a sliding surface on which four side surfaces slide with the guide rail 82. To the slide block 81, the slide plate 45 is rotatably connected about the central axis of the connecting pin 47 via the connecting pin 47.

The guide rail 82 is a square cylinder member, and has the slit 85 through which the connecting pin 47 passes so that the slide block 81 can move to the side surface of a front side, and is formed in the rectangular dovetail groove state ( 9). The guide rail 82 is a sliding surface in which the inner circumferential surface 86 slides with the sliding surface with the slide block 81. The guide rail 82 has a larger width hx in the X direction than the width hz in the Z direction, similar to the guide rails 44a and 44b of the molding die 1 of the first embodiment. In comparison, the bending rigidity in the X direction is large.

The slide base 83 is fixed to the ejector plate 10 so that the guide groove 56 faces the back side (the guide rail 82 side).

The connecting pin 47 is formed longer than the total length of the through hole of the slide block 81 and the through hole 54 of the slide plate 45 so as to pass through the slit 85.

Since the action of the undercut processing mechanism 13 of this embodiment is the same as that of the undercut processing mechanism 11 of the shaping | molding die 1 of 1st Embodiment, description is abbreviate | omitted.

According to the undercut processing mechanism 13 of this embodiment, the guide rail 82, the slide plate 45, and the connection pin 47 become one, respectively, and the undercut processing mechanism of the shaping | molding die 1 of 1st Embodiment Compared with (11), the number of parts can be reduced, and the cost and weight can be reduced. However, in order to improve mechanical strength, it is preferable that it is a structure which has symmetry like the undercut processing mechanism 11 of the shaping | molding die 1 of 1st Embodiment.

FIG. 10 is a perspective view of the undercut treatment mechanism 14 and the ejector plate 10 of the fourth embodiment of the present invention, as viewed from below. FIG. 11 is a cross-sectional view taken along the line C-C of FIG. 10. 11, the sliding surface is shown by the thick line, and the ejector plate 10 is abbreviate | omitted. The same code | symbol is attached | subjected to the same structure as the molding die 1 of 1st Embodiment shown in FIG. 1 thru | or 6, and description is abbreviate | omitted.

Although the undercut processing mechanism 14 of this embodiment has the same basic structure as the undercut processing mechanism 11 of the shaping | molding die 1 of 1st Embodiment, the shape of the inclination pin 90 and the guide rail 92 is shown. This is different and the guide rail 92 is one.

In the undercut processing mechanism 14 of this embodiment, the cross section in which the flange portion 94 in which the slide block 91 of the inclined pin 90 engages with the guide rail 92 and slides is formed is convex. The slit 95 is formed in the in-block member, and the guide rail 92 is a square tube member, and is engaged with the slide block 91, and the slide block 91 is movable, when viewed from a cross section ( 11) It has a dovetail groove type.

In the undercut processing mechanism 14 of the present embodiment, in the slide block 91, the five side surfaces 98a to 98e forming the flange portion 94 become sliding surfaces sliding with the guide rail 92. In the guide rail 92, the inner circumferential surface 96 serves as a sliding surface that slides with the sliding surface of the slide block 91. In addition, the end surface 97 which forms the slit 95 of the guide rail 92, and a part of the side surface of the slide block 91 which opposes the said end surface 97 may be a sliding surface which slides mutually.

The guide rail 92 has a larger width hx in the X-direction than the width hz in the Z-direction, similar to the guide rails 44a and 44b of the molding die 1 of the first embodiment. In comparison, the bending rigidity in the X direction is large.

Like the undercut processing mechanism 14 of the present embodiment, in the undercut processing mechanism of the present invention, the entire slide block of the inclined pin 90 does not need to be surrounded by the guide rail.

12 is an enlarged perspective view of an essential part of the undercut processing mechanism 15 according to the fifth embodiment of the present invention. The same code | symbol is attached | subjected to the same structure as the molding die 1 of 1st Embodiment shown in FIG. 1 thru | or 6, and description is abbreviate | omitted.

The undercut processing mechanism 15 of the present embodiment has the same basic configuration as the undercut processing mechanism 11 of the molding die 1 of the first embodiment, but instead of the slide plates 45a and 45b, the slide rails ( 101) and the number of connecting pins 47 is one. In addition, although the shape of the slide block 102 and the slide base 103 of the inclination pin 100 differs slightly from that of the undercut processing mechanism 11 of the shaping | molding die 1 of 1st Embodiment by this, a basic shape And the function is the same.

The slide rail 101 is a block member having a dovetail groove 105 and is engaged with an upper portion of the slide base 103 formed in a dovetail foot (T) shape by the guide grooves 56a and 56b. It is formed so that sliding is possible. In addition, the slide rail 101 is formed such that a connecting portion 106 having a through hole (not shown) through which the connecting pin 47 is inserted is raised from the upper surface.

13 is an enlarged perspective view of a main part of the undercut processing mechanism 16 according to the sixth embodiment of the present invention. The same code | symbol is attached | subjected to the same structure as the molding die 1 of 1st Embodiment shown in FIG. 1 thru | or 6, and description is abbreviate | omitted. The undercut processing mechanism 16 of the present embodiment has the same basic configuration as the undercut processing mechanism 11 of the molding die 1 of the first embodiment, but the shape of the inclined pin 110 and the slide base 112a, The shape and number of 112b) are different, and the number of the connection pins 47 is one.

In the undercut processing mechanism 16 of the present embodiment, the projecting piece 51 of the slide block 111 of the inclined pin 110 extends one from the center of the lower surface, and has a cross-sectional c-shape having guide grooves 56a and 56b. The two slide bases 112a and 112b are fixed to the ejector plate 10 with the guide grooves 56a and 56b facing each other.

Like the undercut processing mechanisms 15 and 16 of the fifth embodiment and the sixth embodiment, in the undercut processing mechanism of the present invention, the structure of the sliding mechanism in the slide base is not limited to a specific structure and is appropriately optimized. What is necessary is just to have a phosphorus structure.

FIG. 14: is a longitudinal cross-sectional view seen from the front of the shaping | molding die 7 of 7th Embodiment of this invention. In addition, in FIG. 14, the ejector plate 10 and the undercut processing mechanism 17 are shown in front view, and hatching is abbreviate | omitted. The molding die 7 of the present embodiment has the same basic configuration as the molding die 1 of the first embodiment, but is externally threaded to both ends of the inclined pins 120 of the undercut processing mechanism 17. (121, 122) are formed, and female threads (not shown) are screwed to the male threads 121, 122 on the bottom surface of the forming core 123 and the top surface of the slide block 124, respectively.

According to the shaping | molding die 7 of this embodiment, the inclination pin 120 is rotated around a long axis, and the whole of the shaping | molding core 123, the inclination pin 120, and the slide block 124 by the action of a reverse screw is carried out. The length can be adjusted.

Next, the specific example of the shape of the sliding part (slide block) and the guide means (guide rail) of the inclination pin in the undercut processing mechanism and the shaping | molding die of this invention is demonstrated. 15A to 33A and 33B are the same as in Fig. 5 for the first to 25th specific examples of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin of the undercut processing mechanism of the present invention. It is the figure seen from a viewpoint. And the sliding surface is made into the thick line like FIG. The same code | symbol is attached | subjected to the structure similar to the shaping | molding die 1 and 7 and the undercut processing mechanism 11, 12, 13, 14, 15, 16, 17 of 1st-7th embodiment shown to FIG. Are omitted.

The first example shown in FIG. 15 has the same basic configuration as the inclined pins 41 and the guide rails 44a and 44b of the molding die 1 of the first embodiment, but the guides of the guide rails 201a and 201b. The groove 202 is formed in the center of the bottom surface 61 of the groove 53. As a result, the sliding areas of the slide block 43 and the guide rails 201a and 201b are reduced to reduce the sliding resistance, and the slide block 43 and the guide rails 201a and 201b can be slid more smoothly. It also contributes to weight reduction. However, the larger sliding area is advantageous in preventing the swing of the slide block and the guide rail.

The second example shown in FIG. 16 has the same basic configuration as the inclined pins 41 and the guide rails 44a and 44b of the molding die 1 of the first embodiment, but in the Z direction to the slide block 204. Protruding protrusions 205 protruding from both sides facing each other are formed, and the guide grooves 207 of the guide rails 206a and 206b protrude from the protrusions 205 in a width approximately equal to the width of the protrusions 205. It is formed so that it is deeper than quantity. As a result, both side surfaces of the slide block 204 facing each other in the lateral direction and the Z direction of the protrusion 205 become sliding surfaces with the guide rails 206a and 206b.

The third example shown in FIG. 17 has the same basic configuration as the second example shown in FIG. 16, but has a side surface and a protruding surface of the protrusion 205 of the slide block 204 and the guide grooves of the guide rails 206a and 206b. The side and bottom surfaces of 207 are formed to slide.

The fourth example shown in FIG. 18 has the same basic configuration as the second example shown in FIG. 16, but with punched portions 209 on both outer surfaces of the guide rails 208a and 208b facing each other in the Z direction. Is formed. According to this example, weight reduction can be performed while securing bending rigidity.

The fifth example shown in FIG. 19 has the same basic configuration as the second example shown in FIG. 16, but the guide rails 210a and 210b have a dovetail groove shape having a groove angle of 45 degrees only on the other side of the guide groove 211. The protrusion 213 of the slide block 212 is formed in the shape which meshes with the guide groove 211. As shown in FIG. As in the fifth example, the guide groove of the guide rail may have a dovetail groove shape having a groove angle inclined to one side or both sides. The groove angle of the dovetail groove is not limited to a specific angle.

In the sixth example shown in FIG. 20, a dovetail groove 215 having a groove angle of 45 degrees is formed on a surface of the slide block 214 facing each other in the Z direction, and the dovetail groove 215 is formed in the guide rails 216a and 216b. The dovetail feet 217 are formed to mesh with each other. As in the sixth example, a dovetail groove having an inclined groove angle may be formed in the slide block. In addition, in the sixth example, the slide block 214 is formed to have a wider width than the other examples described above, but the width of the slide block 214 is not limited to a specific width.

In the seventh example shown in FIG. 21, a wide angled groove 219 is formed on a surface of the slide block 218 facing each other in the Z direction, and a protrusion 221 having a shape fitted into the angled groove 219 is formed. It is formed in the guide rails 220a and 220b.

In the eighth example shown in FIG. 22, angled grooves 224 are formed on surfaces of the slide block 223 facing each other in the Z direction, and the guide rails 225a and 225b are fitted into the angled grooves 224. It is formed. According to the eighth example, the guide rails 225a and 225b can be configured more compactly. In the present example, for example, when the bending rigidity in the X direction is to be increased, the widths in the X direction of the angular grooves 224 and the guide rails 225a and 225b may be expanded.

The ninth example shown in FIG. 23 has the same basic configuration as the inclined pins 41 and the guide rails 44a and 44b of the molding die 1 of the first embodiment, but the slide block 227 and the guide rails ( Sliding surfaces of 228a and 228b have semicircular surface portions 229 and flat portions 230.

In addition, the tenth example shown in FIG. 24 has the same basic configuration as the ninth example shown in FIG. 23, but the sliding surfaces of the slide block 232 and the guide rails 233a and 233b have only the semicircular surface portion 229. have.

In addition, although the 11th example shown in FIG. 25 has the same basic structure as the inclination pin 41 and guide rails 44a and 44b of the shaping | molding die 1 of 1st Embodiment, the slide block 235 is cylindrical. The guide grooves 238 of the guide rails 237a and 237b have a partial circumferential surface, and the sliding surface has a partial circumferential surface.

As in the ninth to eleventh examples shown in FIGS. 23, 24, and 25, the sliding surfaces of the slide block and the guide rail may be curved. However, in order to prevent the space | interval expansion of a guide rail and the fall of the slide block from a guide rail, it is preferable to have a flat part orthogonal to the direction which prevents expansion and fall-out at least.

In addition, as shown in the example shown in FIG. 25, when the slide block 235 is cylindrical, and guide rails 237a and 237b are formed into a shape in which a cross section has a square with a spacing 239 in part, the guide rails 237a and 237b. The cylindrical guide member 240 shown by giving a dot in FIG. 25 with respect to the guide member 240 (shown by an image line) of the cylindrical shape (or cylindrical shape which has a slit in a part) having the diameter of the same length as the one side of Difference in cross-sectional area with) and flexural rigidity in all directions can be increased.

The twelfth example shown in FIG. 26A has the same basic configuration as the inclined pins 41 and the guide rails 44a and 44b of the molding die 1 of the first embodiment, but the corners of the guide rails 241a and 241b. R chamfering is performed in the portion 242. In the thirteenth example shown in FIG. 26B, C chamfering is performed on the corner portions 244 of the guide rails 243a and 243b. Like the twelfth example and the thirteenth example, the slide block and the guide rail can be chamfered appropriately.

In the fourteenth example shown in FIG. 27A, the basic configuration is the same as that of the eleventh example shown in FIG. 25, but outer surfaces of the guide rails 246a and 246b facing each other in the Z direction are partially formed as circumferential surfaces. In addition, although the basic structure is the same as that of the eleventh example shown in FIG. 25, the fifteenth example shown in FIG. 27B is formed in the outer peripheral surface of the guide rails 247a and 247b by the several circumferential surface from which curvature differs.

Although the basic structure is the same as that of the inclination pin 41 and the guide rail 44a, 44b of the shaping | molding die 1 of 1st Embodiment, the 16th example and 17th example shown to FIG. 28A, 28B are the guide rails. The outer surfaces of 248a, 248b, 249a, and 249b are formed of a plurality of circumferential surfaces having different curvatures. As in the fourteenth to seventeenth examples shown in FIGS. 27A, 27B, 28A, and 28B, the guide rail may include a circumferential surface or a curved surface on the outer circumferential surface. The outer circumferential surface of the guide rail may be formed of a plurality of circumferential surfaces having the same curvature.

In the eighteenth example shown in FIG. 29A, the basic configuration is the same as that of the inclined pin 90 and the guide rail 92 of the undercut processing mechanism 14 of the fourth embodiment, but the slide block 251 has the guide rail 92. The end side which forms the slit 95 of the guide rail 92, is formed so that it may not slide with the cross section 97 which forms the slit 95 of the guide rail 92 and the opposing side surface 98a of It has a groove 252 to be fitted.

In addition, although the 19th example shown in FIG. 29B has the same basic structure as the 18th example shown in FIG. 29A, the cross section 97 in which the slide block 254 forms the slit 95 of the guide rail 92 is shown. It is formed so that it may regulate in the X direction. According to the eighteenth and nineteenth examples shown in FIGS. 29A and 29B, the sliding area can be reduced and the sliding resistance can be reduced while restricting the shaking of the slide blocks 251 and 254 with respect to the guide rail 92.

The 20th example shown in FIG. 30A has the same basic structure as the inclination pin 90 and the guide rail 92 of the undercut processing mechanism 14 of the fourth embodiment, but the slide block 256 and the guide rail 257 are the same. The dovetail groove 258 with a groove angle of 45 degrees is engaged and slid. The groove angle of the dovetail groove 258 is not limited to a specific angle.

In addition, although the basic structure is the same as that of the 20th example shown in FIG. 30A, the twenty-first example shown in FIG. 30B is formed so that the slide block 259 may not slide with the opposing surface 260 of the guide rail 257. FIG. have. The 20th example and the 21st example shown to FIG. 30A and 30B are easy to process the dovetail groove of the guide rail 257 compared with the undercut processing mechanism 14 of 4th Embodiment, and are suitable as a mass production shape.

The 22nd example shown in FIG. 31 has the same basic structure as the inclination pin 90 and the guide rail 92 of the undercut processing mechanism 14 of 4th Embodiment, but the slide block 262 and the guide rail 263 are the same. It is comprised by this circular dovetail groove 264, and is comprised so that it may slide. As in the twenty-second example, the shape of the dovetail groove of the slide block or the guide rail is not limited to a specific shape.

The basic example of the twenty-third example shown in FIG. 32 is the same as the inclination pin 90 and the guide rail 92 of the undercut processing mechanism 14 of 4th Embodiment. It consists of the slide block 266 which fits and slides. As in the twenty-third example, two or more guide rails and a slide block can be configured to engage and slide.

In the twenty-fourth example shown in FIG. 33A, the basic configuration is the same as that of the inclined pins 41 and the guide rails 44a and 44b of the molding die 1 of the first embodiment, but Z of one guide rail 268a is the same. The side surface 269 orthogonal to a direction is formed in the zigzag wave form. 33B, the side surface 271 orthogonal to the Z direction of one guide rail 270a is formed in the curved wavefront. As in the twenty-fourth example and the twenty-fifth example shown in FIGS. 33A and 33B, part or all of the guide rail 270a may be formed in a wavefront shape.

As described above, the molding dies 1 and 7 of the first to seventh embodiments, the undercut processing mechanisms 11, 12, 13, 14, 15, 16 and 17, shown in Figs. 15 to 33A and 33B. Although the undercut processing mechanism, the molding die, and the molded article of the present invention have been described using the first to twenty-fifth embodiments of the shape of the sliding portion (slide block) and the guide means (guide rail) of the inclined pin, the present invention is described. The undercut treatment mechanism, the molding die, and the molded article are not limited to the above embodiments and specific examples, and can be modified and used within a range not changing the gist thereof. For example, the guide bushing (not shown) which guides the pin main body 42 of the inclined pin may be provided in the core 21 and / or the movable side template 22.

Moreover, in the undercut processing mechanism of this invention, R chamfering, C chamfering, etc. may be performed in the side edge of each member.

In addition, the material of the member used for the undercut processing mechanism and the shaping | molding die of this invention is not limited to a specific material, What is necessary is just to use suitably the same material as the material of the member used for a well-known undercut processing mechanism and shaping | molding die. . However, it is preferable that the sliding surface of a slide block, a guide rail, a slide plate, a slide rail, and a slide base uses the material which has good sliding property, or the material which surface treatment performed with good sliding property was performed. In addition, each sliding surface is not limited to surface contact, Line contact or point contact may be sufficient.

Moreover, in the undercut processing mechanism of this invention, the slide plate or the slide rail may be connected to the slide block so that rotation is impossible. However, in order to relieve the load and the bending moment applied to the slide block and the guide rail, it is preferable that they are rotatably connected. In addition, in order to disperse shear stress, it is preferable that the connecting pin is disposed near the sliding portion of the slide plate or the slide rail.

In the undercut treatment mechanism of the present invention, some or all of the molding core, the inclined pin (pin body, slide block), the slide plate, or the slide rail may be integrally formed. In addition, the guide rail may be integrally formed with the movable side template and / or the movable side mounting plate, and the slide base may be integrally formed with the ejector plate. In addition, you may provide the guide groove which guides a slide plate or a slide rail in an ejector plate instead of a slide base.

In addition, the undercut processing mechanism of this invention is not limited to what is called a loose core, For example, it can also apply to what is called a slide core, a cavity slide, etc.

In addition, the undercut processing mechanism of this invention is not limited to application to the molding die which opens and closes up and down, It can also be applied to the molding die which opens and closes in left and right or another direction. And when arrange | positioning the undercut processing mechanism of this invention to a shaping | molding die at an angle near horizontal, it is preferable to determine the shape of a guide rail so that sufficient bending rigidity may also be ensured also in the gravity direction.

In the undercut treatment mechanism of the present invention, the guide means (guide rail) is formed in a shape in contact with the sliding portion (slide block) over the entire stroke of the inclined pin, and the bending in a specific direction in the sliding portion (slide block) The rigidity is formed in a large shape. The specific direction is basically a direction in which the load and the bending moment in the sliding portion are assumed to be concentrated, for example, a moving direction or gravity direction of the forming core and the slide plate, but the present invention is not limited thereto. What is necessary is just to set it as the desired direction to make bending rigidity large.

In addition, the bending stiffness is proportional to the cross-sectional secondary moment, and with respect to the cross-sectional secondary moment, basically, the width (length) of the bending direction in the cross section and the direction orthogonal to the bending direction from the center of the bending moment to the cross-section center of gravity. Since the distance greatly affects, in order to increase the bending stiffness in the desired specific direction, the width (length) of the specific direction in the cross section and the center of gravity of the bending moment in the cross section are orthogonal to the specific direction from the center of gravity. What is necessary is just to determine the shape of a guide rail (and slide block) so that the distance of a direction may become large.

In the undercut treatment mechanism and the molding die of the present invention, the inclined pin slides in a direction inclined with respect to the mold opening direction of the molding die and pulls out the undercut portion at the time of removing the mold of the molded article having the undercut portion. An inclined pin having a sliding portion, which is arranged to include, for example, an overall inclined pin mounted and sliding on a fixed side template and / or a movable side template of a molding die for forming an undercut portion such as an angular pin. Can be.

As mentioned above, although preferred embodiment was described, referring drawings, those skilled in the art can see this specification, and can easily assume various changes and correction within an obvious range. Accordingly, such changes and modifications are to be interpreted as being within the scope of the invention as defined by the claims.

1, 7: molding die
11, 12, 13, 14, 15, 16, 17: undercut treatment mechanism
40, 123: forming core
41, 70, 80, 90, 100, 110, 120: inclined pin
43, 71, 81, 91, 102, 111, 124, 204: Slide block (sliding part)
212, 214, 218, 223, 227, 232, 235: slide block (sliding part)
251, 254, 259, 262, 266: slide block (sliding part)
44a, 44b, 82, 92, 201a, 201b: guide rail (guide means)
206a, 206b, 208a, 208b, 210a, 210b: guide rail (guide means)
216a, 216b, 220a, 220b, 225a, 225b: guide rail (guide means)
228a, 228b, 233a, 233b, 237a, 237b: guide rail (guide means)
241a, 241b, 243a, 243b, 246a and 246b: guide rail (guide means)
247a, 247b, 248a, 248b, 249a, 249b: guide rail (guide means)
257, 263, 268a, 270a: guide rail (guide means)
53, 207, 211, 238: Guide Home
61: bottom surface
62: side
86, 96: inner circumference
98a, 98b, 98c, 98d, 98e: side
229: semicircle
230: flat part
269, 271: side
P: Molded Products
P1: Undercut Section

Claims (12)

An undercut processing mechanism having a molding core for molding an undercut portion, which is mounted and used in a molding die for molding a molded article having an undercut portion,
An inclined pin for removing the molded core from the undercut portion by moving in a direction inclined with respect to a mold opening direction of the molded mold when removing the molded product from the molded article; and
Guide means for guiding the movement of the inclined pin
Including,
The inclined pin has a sliding portion sliding in contact with the guide means,
The guide means is formed in a shape in contact with the sliding part over the entire stroke of the inclined pin to regulate the moving direction of the inclined pin, and in a direction in which load and bending moment are not concentrated on the sliding part. The bending rigidity of the concentrated direction is formed in a stronger shape than the bending rigidity,
The width of the concentrated direction is greater than the width of the direction in which the load and the bending moment are not concentrated in the sliding part,
Undercut treatment apparatus. The method of claim 1,
The guide means has a shape in which the bending stiffness in the concentrated direction is stronger than the bending stiffness in the direction in which the load and the bending moment are not concentrated in the sliding portion, as compared with the case where at least a portion is a cylinder or a cylinder having a slit in the portion. Undercut treatment mechanism which is formed by. The method according to claim 1 or 2,
The said guide means is an undercut processing mechanism which has one or more planes on the outer peripheral surface. The method according to claim 1 or 2,
The said guide means is an undercut processing mechanism which has one or more wavefronts in the outer peripheral surface. The method according to claim 1 or 2,
The said guide means is an undercut processing mechanism which has one or more curved surfaces on the outer peripheral surface. The method according to claim 1 or 2,
The sliding portion and the guide means each have a sliding surface parallel to the moving direction of the inclined pin, which slides in contact with each other,
The said sliding surface is an undercut processing mechanism whose one part or all part is a straight line when viewed from a cross section. The method of claim 6,
The sliding surface is an undercut treatment mechanism in which a part or all of the sliding surface is a straight line orthogonal or parallel to the moving direction of the forming core. The method according to claim 1 or 2,
The guide means is composed of a plurality of members having a sliding surface that slides with the sliding portion, and undercut processing mechanism is sandwiched and restrained by at least a portion of the sliding portion. The method according to claim 1 or 2,
The inclined pin includes a pin body having one end connected to the forming core and the other end connected to the sliding part,
The pin body has an undercut processing mechanism having both male and female threads which are reverse threads, respectively, at both ends. The method according to claim 1 or 2,
The guide means has a dovetail groove, and the guide means guides the sliding portion through the dovetail groove. A molding die comprising the undercut treatment mechanism according to claim 1. delete

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