JPS6135924A - Undercut processing structure of molding die - Google Patents

Abstract

PURPOSE:To strikingly improve the operating efficiency by a structure wherein an undercut processing structure with a specified mechanism is provided on a molding die so as to allow to simply and quickly disassemble, assemble, finely adjust and the like a slant ejector side part core under the state that the molding die is open. CONSTITUTION:One end of a slant ejector side part core 2 is detachably attached to the sides of pushing-out plates 4 by means of set screws 6. When the disassembling of the slant pushing-out side part core 2 is intended, the core 2 is pushed out by sliding slant core patches 8 along the slope B of a movable mold 9. On the other hand, a molded part 1 is axially ejected by means of an ejector pin 10. As a result, the molded part with an undercut is removed from the slant core 2. The removal of the slant core 2 from the mold can easily be done by disassembling the set screws 6, slant core return bars 5 and the slant core patches 8 under the state that the mold is open.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to an undercut treatment structure for a molding die. It is currently being manufactured.

In this case, in order to remove the folded part formed on the product when opening the mold after molding, for example, a slope with a predetermined inclination angle or a guide/equal pipe mold is used. A molding apparatus is used which can conveniently perform mold cutting by guiding each part of the structural form in a predetermined direction using the slopes or guide pins.

In order to obtain high-quality products using the above equipment, the structure around the folded part, that is, the undercut treatment structure, is especially important. Preferably, it is possible to carry out

(Problem to be Solved by the Invention) However, conventionally, for example, in a molding machine having an inclined extrusion structure in which a part of the mold is moved along a slope having a predetermined inclination angle when opening the mold, an undercut shape is formed. If a return structure is added to the inclined extrusion side partial core to return it to a predetermined position after opening the mold using an elastic means such as a spring, the core must be assembled or disassembled from the back side of the mold. There wasn't. For this reason, when disassembling the above partial core for alignment or defect correction, it is necessary to disassemble most of the parts that form the movable mold, such as the mounting plate, extrusion plate, spacer block, etc., which takes a lot of time. was.

The present invention is intended to solve many of the problems in the prior art described above, and its purpose is to simplify and quickly assemble and disassemble partial cores of a molding die that performs undercut processing in an open state. The object of the present invention is to provide an undercut processing structure that can perform undercut processing.

(Means for Solving the Problems) That is, the undercut treatment structure of the present invention comprises: an inclined extrusion side partial core that constitutes a part of a molding die; an extrusion plate for extruding the inclined extrusion side partial core; and the inclined extrusion side partial core. In a molding die having a movable side partial core that together with a side partial core forms an undercut portion of the molded metal dust, one end of the inclined extrusion side partial core is attached to a side surface of the extrusion plate by a stopper. The present invention is characterized in that the stopper can be attached and detached while the mold is attached and the mold is opened.

One end, usually the lower end, of the inclined extrusion side partial core is attached to the top or side surface of the extrusion plate using a fastener such as a bolt. It is best to connect the core and the extrusion plate so that both members can slide freely ◇Also, the connecting position is such that when the mold is open, a stopper can be easily attached from the outside without removing other parts. A removable location, that is, a side surface of the extruded plate is preferable. In addition to bolts, fasteners that are commonly used for joining mechanical parts can be used.

(Function) When the inclined extrusion side partial core is attached to the side surface of the extrusion plate, the core can be disassembled, assembled, finely adjusted, and defects corrected by attaching and detaching the stopper while the mold is open.

In addition, when the core is attached to the upper surface of the extrusion plate, the same operation as described above can be carried out with the core pushed up the extrusion plate a predetermined distance after opening the mold.

(Example) The present invention will be explained in further detail in the following example. Note that the present invention is not limited to the following examples.

Embodiment 1: Figures 1 to 3 are cross-sectional views of one embodiment of the undercut treatment structure of a molding die of the present invention, and Figure 3 is a partially broken view of Figure 1 when viewed from the entrance direction. FIG. In FIG. 1, a molded product 10 is formed of an undercut portion H with an inclined extrusion side partial core 2 (hereinafter abbreviated as an inclined core) and a movable side partial core 3. The inclined core 2 is placed on the extrusion plate 4 and is connected to the extrusion plate 4 by an inclined return shaft 5 as shown in FIG. Furthermore, the inclined core return rod 5 is placed on the set screw 6,
Removal from inclined core 2, □□ Wow, t・ Movement of each part! ! As shown in FIG.
Movable because there is a line inclined core backing plate 8! It is extruded along slope B of I9. On the other hand, molded product IFi extrusion pin 1
Since the molded product 1 having the undercut portion is extruded in the axial direction by the tilted core 2, the molded product 1 is removed from the inclined core 2. Next, the push-out plate 4 is returned to its original position by the return spring 11 shown in FIG. ◇Remove the inclined core 2 from the mold synchronously and return to the original position ◇In the above case, removing the inclined core 2 from the mold can be easily done by disassembling the setscrew 6, inclined core return handle 5, and inclined core backing plate 8 with the Fi mold open. It can be carried out.

Embodiment 2: FIG. 4 Another embodiment of the present invention; FIG. 5 is a partially cutaway sectional view taken from the entrance direction of FIG. 4. Moreover, the arrow in the figure indicates the direction of movement. The difference from Embodiment 1 is that when the movable side partial core 3 is attached, in Embodiment 1, the inclined tip 20 can be disassembled and assembled without extrusion, whereas in this embodiment, the inclined core return rod 5' Push out plate 4 until exposed.
The inclination tip 20 cannot be disassembled and assembled unless it is pushed out by the push rod 7.

Comparative Example: FIG. 6 is an example of a conventional undercut treatment structure of a molded metal, and FIG. 7 is a partially cutaway sectional view taken from the entrance direction of FIG. 6. Since the inclined core return plate 12 could only be disassembled from the mounting plate 13 side, it was impossible to disassemble the inclined tip 20 after the inclined core 2 was attached to the molding machine.

(Effects of the Invention) As described above, the undercut treatment structure of the molding die of the present invention allows disassembly, assembly, fine adjustment, defect correction, etc. of the inclined extrusion side partial core in the mold open state easily and quickly.
It is easy to rearrange and adjust the mold according to the type of molded product, and the time required for these operations is shortened, which has a great effect on improving work efficiency.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of one embodiment of the undercut treatment structure of a molding die of the present invention, FIG. 2 is a sectional view showing a state in which the partial core on the inclined extrusion side is extruded in the example of FIG. The figure is a partially broken sectional view of FIG. 1 when viewed from the entrance direction, FIG. 4 is a sectional view of another embodiment of the present invention, and FIG. 5 is a partially broken sectional view of FIG. 4 when viewed from the entrance direction. , FIG. 6 is a sectional view of an example of the undercut treatment structure of a conventional molding die, and FIG. 7 is a partially cutaway sectional view of FIG. 6 as viewed from the entry direction. In the figure, 1... Molded product 2... Inclined extrusion side partial core 3.
...Movable side partial core 4...Extrusion plate 5.5'...
- Inclined core return rod 6... Set screw 7... Extrusion rod 8... Inclined core backing plate 9... Movable type
10... Push-out pin 11... Return spring
12... Inclined core return plate 13... Mounting plate Patent applicant Toyota Motor Corporation Kinsha 22 Figure 4 Figure 5. ! 1 O6 Diagram Proceedings Amendment Document dated 1985/10/30 1 Indication of Case 1989 Patent Application No. 159965 2.i
Light+7) Name: Undercut treatment structure of molded metal 3
, Relationship with the case of the person making the amendment Patent applicant name (320) ) M Yu Jidosha Co., Ltd. (1 person) 5. Date of amendment order "voluntary" 6. Subject of amendment 7. Contents of amendment (1) Details ``In addition, 14 is a spacer block.'' is added next to ``It can be done.'' in the 6th line from the bottom of the 6th line. 12) No. 714, line 5 of the same statement [This is an impossible point. ”
Next, add "6' is a set screw." 1.33 "6--Set screw" in the third line from the bottom of page 8 is corrected to "Hegi--Set screw." (4) Add "14.-Spacer block" next to "ia--Mounting plate" on the second line of page 9 of the compilation. (5) Correct figures 1 to 4 and 6 on separate sheets. (Li Akekenda*1 t'i<>o+ I-fault cutting blade, Yobei's sectional view t'' Karasu-19 middle 61 slope, f't+ 7
＞/? p6-, the string egg t^hate 0, Yu (dance correction). (Another dislike) Figure 2, Figure 4, Figure 6

Claims (1)

[Claims] A tilted extrusion side partial core that constitutes a part of the mold, an extrusion plate that extrudes the tilted extrusion side partial core, and a movable part that together with the tilted extrusion side partial core forms an undercut portion of the molding die. In the molding die having a side partial core, one end of the inclined extrusion side partial core is attached to the side surface of the extrusion plate by a stopper, and the stopper can be attached and detached when the mold is open. The undercut treatment structure of the molding die.