JPS608136B2 - mold pin - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a mold pin used as a product ejection pin, return pin, punch, etc. in a pouring mold, press mold, etc.

A conventional pin of this type will be described with reference to FIG.

In the figure, 1 is a pin, 2 is a holder for pin 1,
The pin 1 has a head la accommodated in a counterbore 3a of a pin fixing hole 3 of a holder 2, and a pin extending from the head la to be inserted into the pin fixing hole 3.
and a shaft portion lb accommodated in the shaft accommodating portion 3b. 4
is a pin holder, which is fixed to the retainer 2 in an overlapping relationship with a suitable means such as a bolt to hold the pin head la in the counterbore 3a.

Note that the holder 2 and the presser 4 are usually plate-shaped and hold a desired number of pins 1 fixedly as described above. Next, the case where the above-mentioned pin is used in a pouring mold (for example, a die-casting mold) will be explained.

In Figure 2, the pin 1 in Figure 1 is used as the push-out pin IA (three in the drawing), and the pin 1 in Figure 1 is placed in the center of the retained odor 2, and the pins on both sides of the push-out pin IA are Pin 1 in Fig. 1 is used as the return pin IB (two are visible in the drawing), and this return pin IB is used as the push-out pin IA.
It is made thicker than the push-out pin IA to protect the pin.
As explained in FIG. 1, each pin IA, IB has its head la fixedly held in the counterbore 3a of the pin fixing hole 3 of the holding shell 2. In the figure, 5 is a fixed type, 6 is a movable type,
7 is a guide pin, 8 is a support block for the movable mold 6, 9 is a bolt for fixing the presser 4 to the holding member 2, and 1 is a mold space into which the molten material is introduced from an injection port (not shown). The product is made by injection, and then when the movable mold 6 is lowered, the push-out pin IA pushes the product up. During this time, the return pin IB protects the ejecting pin IA by preventing horizontal relative displacement between the holding odor 2 and the movable mold 6. Next, a case where the pin 1 shown in FIG. 1 is used as a punch in a press mold will be briefly explained with reference to FIG. 3.

In FIG. 3, the pin 1 shown in FIG. 1 is used as a punch IC, and the pin 1 shown in FIG. 1 is arranged in the center of the holder 2 in FIG. This punch IC is also fixedly held on the holding holder 2 in exactly the same manner as in FIGS. 1 and 2, and the scale cutting force is received by the presser 4. In the figure, 11 is a press body, and 12 is a die having a hole 12a into which a punch IC is inserted. As mentioned above, in the conventional pin, the head la is fitted into the counterbore part 3a of the pin fixing hole 3, so it is necessary that the outer dimension of the pin head la is larger than the outer dimension of the shaft part lb. Met.
Therefore, conventionally, as one method of manufacturing pins, the head 1a of one pin material equal to the outer diameter of the pin head la was
The shaft portion lb was formed by leaving only one portion and cutting off the other portion to a desired diameter.

Therefore, there is a large material loss, and the head part la is the shaft part l.
Since the pins are larger than b, it is not possible to continuously pass them through a grinding device and grind them, and each pin must be ground individually, resulting in a drawback that it takes time and effort to manufacture the pins. Another method for manufacturing the pin 1 is the forging method using a mold, but this also takes time and effort for final polishing, requires a new mold, and requires quenching and phosphorus annealing. There were drawbacks such as the need to do the same.

Furthermore, in addition to pins of this type in which the head and the shaft are integrated as described above, there are also pins with a split structure in which the head and the collar are separated.

As shown in Fig. 4, the pin with this split structure has a threaded part wing 01 provided in the head la and a threaded hole 1 provided in one end of the gutter part lb.
Since it is of a structure that is screwed into the 02, it is necessary to carry out a time-consuming threading process, which takes time and money, and has the disadvantage that cracks occur in the threaded part after long-term use. The present invention was made to eliminate the drawbacks of the conventional pins described above, and by eliminating the protrusion on the pin head, the present invention significantly reduces pin material costs and machining time, and significantly increases strength. The purpose of this invention is to provide a new pin for molds that can reduce costs.

An embodiment of the present invention will be described with reference to FIGS. 5 to 7.

In the figure, numerals 2, 3, and 4 are the same as those in FIGS. 1 to 3. In the figure, reference numerals 13 indicate a head 13a which is accommodated and fixed in the counterbore 3a of the pin fixing hole 3 of the holder 2, and a shaft extending from the head 13a and accommodated in the shaft customer part 3b of the pin fixing hole 3. 13b is the pin consisting of the head 13a of the pin 13, and 13c is the head 13a of the pin 13.
A tapered recess is formed on the outer periphery of the Fujibe 13M so that the diameter gradually decreases from side to side. 14 is a snap ring-shaped locking member with a circular cross section iron-clad in the recess 13c, and its outer dimensions are the same as those of the pin shaft. The outer size of the portion 13b is larger than the inner size of the recess 13c.
However, in the illustrated embodiment, the size and thickness are such that about half of the cross section is accommodated in the recess 13c at the deepest position of the recess 13c. In this embodiment, the counterbore portion 3a of the pin fixing hole 3 is tapered to match the slope of the recess 13c.
As shown in FIG.
It is located protruding from the side. Next, how to attach the pin 13 to the holder 2 will be explained. With the presser 4 removed, insert the pin 13 into the pin fixing hole 3 of the holding odor 2, and press the head 13a.
The locking member 14 is inserted into the recess 13c of the pin head 13a by protruding from the counterbore 3a of the pin fixing hole 3, and the locking member 14 is inserted into the inner peripheral surface of the counterbore 3a of the pin fixing hole 3. Push the pin 13 into the hole 3 until it hits the position. However, the locking member 1
4 is the outer peripheral surface of the recess 13c and the counterbore portion 3a of the pin fixing hole 3
However, at this time, the top surface 13e of the pin head 13a is flush with the surface 2a of the holder 2 on the counterbore 3a side, or protrudes a little more than that. The dimensions of the recess 13c and the locking member 14 are determined in advance so that they are in the same state. Next, the presser tool 4 is vertically fixed to the holder 2 using a suitable means such as the bolt 9 shown in FIG. 2, and the attachment of the pin 13 is completed. The force applied to the pin 13 in the direction of arrow A is supported by the presser 4, and the force in the direction of arrow B is supported by the sliding action of the locking member 14. In order to enhance this effect, it is preferable to make the axial inclination of the recess 13c larger than the oblique inclination of the counterbore portion 3a, as shown in FIG. As described above, if the dimensions are such that the top surface 13a of the pin 13 protrudes a little from the surface 2a of the holder 2, when the presser 4 is tightened to the holder 2, the pin 13 will be damaged by the holder 4. When pressed, the locking member 14 slightly plastically deforms or the recess 13 of the pin 13
The head 13a of the pin 13 is inserted into the pin fixing hole 3 by slightly biting into the outer circumferential surface of c or the inner circumferential surface of the counterbore 3a of the pin fixing hole 3.
It is firmly housed and fixed.

Therefore, in addition to the shaft portion 13b of the pin 13 being held by the inner peripheral surface of the shaft accommodating portion 3b of the pin fixing hole 3, the pin 13 is also held horizontally by strong surface-to-surface contact between the pin top surface 13e and the opposing surface of the presser 4. It is held firmly so that it does not shake. As mentioned above, the position of the shoulder 13d is adjusted to the counterbore portion 3a of the pin fixing hole 3.
If the pin 13 is made to protrude from the end 3c toward the counterbore 3a, the cross-sectional area can be increased without increasing the depth of the recess 13c in the shoulder 13d, that is, without reducing the strength of the pin 13 in the shoulder 13d. A locking member 14 can be used.

Also, in this way, the position of the shoulder 13d is at the end 3 of the counterbore portion 3a.
If the locking member 14 protrudes toward the counterbore portion 3a from c.
Place it on the shoulder 13d of the pin 13 and connect this shoulder 13d and the recess 13.
Since the locking member 14 can be held between the three surfaces of the outer circumferential surface of e and the inner circumferential surface of the counterbore portion 3a, the locking member 14 can be held even more firmly. shoulder 13
Since the center can receive the shear force applied from d, it is less likely to be destroyed. Furthermore, as described above, the pin recess 13
If the inclination in the direction of the bag shown in c is made larger than the inclination of the counterbore portion 3a of the pin fixing hole 3, the force in the direction of arrow A in FIG. Damage to the member 14 is reduced and its lifespan is extended.

In the embodiments described above, the locking member 14 has a circular cross-sectional shape. The locking portion may be a quadrilateral having inner and outer surfaces facing each other.

Three examples of locking members having such quadrilateral cross-sectional shapes are shown in FIGS. 9 to 11. A locking member 14A having a quadrilateral cross section shown in FIG.
The snap ring has a parallelogram cross section and has an inclined side surface 142 parallel to the tapered outer circumferential surface of the head recess 13c.
It can be used when the hole is tapered as shown in the figure.
Further, the locking member 14B having a quadrilateral cross section shown in FIG. The snap ring has a trapezoidal cross section and an inclined inner surface 142, and can be used when the counterbore 3a of the pin fixing hole 3 is a straight hole as shown in FIG. Furthermore, the locking member 14C having a quadrilateral cross section shown in FIG. 1
an inclined inner surface 145 opposite to the tapered outer circumferential surface of the head recess 13c; and a flat surface 146 opposed to the shoulder 13d of the head recess 13c;
When the snap ring has a quadrilateral cross section and has a top surface 13e of the head and a flat surface 147 facing the presser foot 4, and the counterbore 3a of the pin fixing hole 3 is a tapered hole as shown in FIG. It can be used for. Locking member 14 in FIG.
In C, the plane 147 is parallel to the top surface 13e of the pin head 13a and runs opposite to the presser foot 4, so the force exerted by the pin 13 in the direction A in FIG. 6 is widely dispersed and applied to the presser foot 4. Therefore, fatigue of the pin head 13a and the presser 4 is reduced.

Therefore, this locking member 14C is most suitable for a punch with a large pin load. Furthermore, this locking member 14C is
A split locking member 14D consisting of two upper and lower locking members 148 and 149 as shown in FIG. 2 may be used, and in this case, the number of divisions and the cross-sectional shape of each may be appropriately selected. In FIG. 11, when the counterbore portion 3a of the pin fixing hole 3 is a straight hole as shown in FIG. A locking member may be used. Each of the above locking members 14,
14A, 14B, 14C, and 140 are all shown as having a snap ring shape, but they may also have a split shape as shown in FIG. Steel, aluminum, coin, glass fiber reinforced plastics, hard rubber, etc. may be selected as appropriate.

Note that each locking member 14C, 14 in FIGS. 11 and 12
Regarding D, "As mentioned above, the plane 147 is the pin head 13
Since it is flush with the top surface 13e of a and supports the pin load, a splitting-shaped item that is housed and fixed in a nearly annular state can be passed through it, and the material is preferably hard such as spring steel. Regarding the locking member 14D in FIG. 12, it is possible to change the material for each stage. The pin 13 described above is usually a round bar, but it may also be a square bar.
3b may have a different shape.

In particular, if a square bar pin 13 is used as the push-out pin IA as shown in FIG. 2, the pitch between the pins can be narrowed compared to a round bar, so the push-out pin IA can be arranged finely. As described above, according to the present invention, since the protrusion of the pin head is eliminated, the cost of pin materials can be significantly reduced, the processing time can be significantly shortened, and the effects of increased strength and significant stock reduction can be achieved.

Further, since the concave portion of the pin head is tapered, machining is easy, and the pin can be firmly held by the locking action with the locking member.

[Brief explanation of the drawing]

Figure 1 is a side view showing a conventional pin. Figure 2 is a diagram of the conventional pin shown in Figure 1 used in a pouring mold. Figure 3 is a diagram of the conventional pin shown in Figure 1 used in a press mold. FIG. 4 is a partially cutaway side view showing a different conventional pin, FIG. 5 is a side view showing an embodiment of the present invention pin, and FIG. 6 is an enlarged view showing the fixed state of the present invention pin shown in FIG. 7 is a plan view of the snap ring-shaped locking member 14, FIG. 8 is an enlarged sectional view showing different fixing states of the pin of the present invention, and FIGS. 9 to 9 are diagrams showing different locking members 14. An enlarged cross-sectional view of a pin fixing part showing an embodiment; Fig. 2 is an enlarged cross-sectional view of a pin fixing part showing a further different embodiment of the locking member 14C of Fig. 11;
The figure is a plan view of the split-shaped locking portion village 84. In the figure, 13 is the pin, turtle 3a is the head, turtle 3b is the ball, and 13c
is a concave area. 3d is the shoulder, 13e is the top L turtle 4, 14A,
The locking members 14B, 14C, and 14D also have an inclined outer surface, the blade 42 has an inclined inner surface, and the turtle 43 has a vertical outer surface.
144 is a long sloping outer surface, 45 is a long inner surface, and 46 is a long inner surface.
3 Turtle 47 is a flat surface, 148 and 149 are two upper and lower locking members, 2 is a holding odor, 3 is a pin fixing hole, 3a is a counterbore, 3
b is the rattan storage part, 3c is the oribe of the counterbore part 3a, and 4 is the presser odor. Note that the same parts in the drawings are designated by the same reference numerals. 1 drawing 2 drawings traditional 3 drawings traditional drawing 5 drawing Tsutomu 6 drawing 7 drawing 8 drawing Tsutomu 9 drawing traditional 10 drawing traditional 11 drawing 12 drawing 13

Claims (1)

[Scope of Claims] 1. A mold pin having a head that is housed and fixed in a counterbore of a pin fixing hole of a holder and a shaft extending from the head; A tapered recess is formed in the circumferential direction that gradually becomes deeper toward the shaft, and the outer dimension of the head is the same as or smaller than the outer dimension of the shaft, and the head recess has an outer dimension larger than the shaft. A pin for a mold, characterized in that a locking member is provided at a location, and the locking member is received by an inner peripheral surface of a counterbore portion of the pin fixing hole. 2. The mold pin according to claim 1, wherein the locking member has a circular cross-sectional shape. 3. The cross-sectional shape of the locking member is a quadrilateral having inner and outer surfaces that are in contact with the inner circumferential surface of the counterbore of the pin fixing hole and the tapered outer circumferential surface of the head recess, respectively. Pins for molds. 4. The cross-sectional shape of the locking member is such that the inner and outer surfaces thereof are in contact with the inner peripheral surface of the counterbore of the pin fixing hole and the tapered outer peripheral surface of the head recess, respectively, and the shoulder formed by the head recess. The mold pin according to claim 1, which is a quadrilateral having a plane in contact with the presser and a plane in contact with the presser together with the top surface of the head. 5. The mold according to claim 1, wherein the shoulder formed by the head recess is positioned so as to protrude toward the counterbore side from the end of the counterbore of the pin fixing hole. pin. 6. Claims 1 to 6, characterized in that the locking member is received at the deepest position of the head recess.
The mold pin according to any one of Items 3 and 5. 7. The device according to claim 1, wherein the axial inclination of the head recess is larger than the inclination of the counterbore of the pin fixing hole. Pin for mold. 8. The mold pin according to any one of claims 1 to 4, wherein the locking member has a snap spring shape. 9. The mold pin according to any one of claims 1 to 4, wherein the locking member has a split ring shape.