JPH0938990A - Ejector pin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make various applications, ensure the flange lower-part hardness of a shank part surely for easy molding by forming a flange part into a cap shape, and the shank part into a rod shape with different members, and fixing the part at the shank part with a fixing means. SOLUTION: In this ejector pin 1, the end of a shank part 2 is fitted into a flange part 3, and a through hole 5 in the flange part 3 is fitted to a recessed part 4 in the shank part 2. A staking pin 6 is inserted into the through hole 5 and is pressed in the recessed part 4. Some pressure is applied to the staking pin 6 from the outside, and the end of the staking pin 6 is crushed by the pressure, forced out in the radial direction, and staked. As a result, the staked part serves as a stopper so as to prevent the staking pin from coming off from the through hole 5 and going out, and the end of the staking pin 6 is fixed at the recessed part 4 in the shank part 2 in a pressed-out condition. In the shank part 2, the staking pin 6 serves as a stopper so as to prevent the pin from coming off from the flange part 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ejector pin which can be applied to a wide variety of types, is easy to mold, and can be manufactured at low cost.

[0002]

2. Description of the Related Art An ejector pin is used as a model of a molded product in resin molding using a plastic mold. The ejector pin has conventionally been constructed as shown in FIG. That is, the ejector pin 1 includes a rod-shaped shank portion 2 and a shank portion 2 formed at one end of the shank portion 2.
And a collar portion 3 having a larger diameter. In this conventional ejector pin 1, when the length of the collar portion 3 is set from a rod having the same diameter as the diameter of the collar portion 3 and the diameter and length of the shank portion 2 are determined, the collar portion 3 remains. The shank portion 2 was machined and formed to a set diameter. Alternatively, in the conventional ejector pin 1, when the length of the collar portion 3 is set from the rod having the same diameter as the diameter of the collar portion 3 and the diameter and length of the shank portion 2 are determined, the shank portion 2 is removed. The shank portion 2 was formed by redging and hitting the collar portion 3 while leaving the collar portion 3 in a set diameter.

[0003]

[PROBLEMS TO BE SOLVED BY THE INVENTION] Plastic mold products require a wide variety of shapes and dimensions depending on the intended use.
In the case of ejector pins for plastic molds, there are many types such as straight, stepped and square. In the case of such an ejector pin, the collar diameter, the collar length, the shank diameter, and the shank length are different depending on the place of use, and conventionally, many types have been manufactured in large quantities in advance to meet orders. However, although such ejector pins are manufactured according to the intended use, precision is required, and since they are manufactured by redging and tapping or cutting out as in the past, it takes time to manufacture if orders are concentrated. It may happen that the required order is not completed.

Further, when manufactured by hitting with red and hitting or shaving as in the conventional case, the shank portion may not be able to sufficiently secure the lower brim hardness, resulting in poor yield. Further, in the conventional method of manufacturing by redning and hitting or shaving, it is not easy to secure precision, and it is difficult to reduce the manufacturing cost.

An object of the present invention is to be able to immediately meet a large number of orders for a wide variety of ejector pins, to ensure the shank hardness below the collar, to facilitate molding, and to manufacture at low cost. Is to

[0006]

According to a first aspect of the invention, in an ejector pin composed of a collar portion and a shank portion, the collar portion is formed in a cap shape and the shank portion is formed in a rod shape. Separate member, and the collar portion is fixed to the shank portion by a fixing means.

As described above, since the flange portion of the ejector pin is formed in a cap shape, the shank portion is formed in a rod shape and is formed by another member, and the flange portion is fixed to the shank portion by the fixing means. It can be finished to the standard size in advance according to the thickness of the collar part, and the diameter of the shank part can be prepared in advance according to the standard size. The shank part can be prepared according to the diameter and thickness of the collar part. The diameter and length of can be easily selected, and the manufacturing cost can be significantly reduced.

According to a second aspect of the present invention, the fixing means has a through hole formed in the collar portion from the outer peripheral surface toward the shaft center, and a recess is formed in the shank portion, and one end of the shank portion is used as the collar portion. It is made to fit, penetrate the through hole of the collar part, fit the caulking pin in the recess of the shank part, and apply pressure from the outside to caulk the caulking pin to fix the collar part and the shank part. .

As described above, the fixing means is formed with a through hole in the collar portion from the outer peripheral surface toward the axis center, a recess is formed in the shank portion, and one end of the shank portion is fitted into the collar portion,
The caulking pin penetrates through the through hole of the collar, the caulking pin is fitted in the recess of the shank, and pressure is applied from the outside to caulking the caulking pin to secure the collar and the shank. The parts can be reliably fixed to each other, the manufacturing can be efficiently performed, and the cost can be reduced.

According to a third aspect of the present invention, a step portion having a small diameter is formed on a peripheral surface passing through a portion where the through hole of the collar portion is formed, and a ring is fitted to the step portion. .

Since a step portion having a small diameter is formed on the peripheral surface passing through the portion where the through hole of the collar portion is formed and a ring is fitted on the step portion, the color of the ring should be used properly. With this, it is possible to easily identify the material, the tolerance, and the like, and it is possible to prevent a delivery error.

According to a fourth aspect of the invention, in the fixing means, a female screw is formed on the inner peripheral surface of the collar portion, a male screw is formed on one outer peripheral surface of the shank portion, and the collar portion is screwed onto the shank portion. As a result, the flange portion and the shank portion are fixed to each other.

In this way, by forming a female screw on the inner peripheral surface of the collar portion, forming a male screw on the outer peripheral surface at one end of the shank portion, and screwing the collar portion onto the shank portion, the collar portion and the shank portion are fixed to each other. Since this is done, the shank portion and the collar portion can be easily fixed.

According to a fifth aspect of the present invention, in the fixing means, the collar portion and the shank portion are formed by forming the outer diameter of one end of the shank portion slightly larger than the inner diameter in the collar portion and press-fitting the shank portion into the collar portion. It is intended to fix and.

Since the shank portion and the shank portion are fixed to each other by press-fitting the shank portion into the collar portion as described above, the shank portion and the collar portion can be reliably fixed.

According to a sixth aspect of the present invention, the fixing means fixes the flange part and the shank part by applying an adhesive to the inner surface of the flange part and fitting and adhering one end of the shank part for adhesion. It is the one.

As described above, the adhesive is applied to the inner surface of the collar portion, and one end of the shank portion is fitted and adhered to thereby fix the collar portion and the shank portion. Therefore, the manufacturing is easy.

According to a seventh aspect of the present invention, the fixing means is formed by forming a recess in the shank portion and externally applying pressure to the recess of the shank portion from the outer peripheral surface of the collar portion to crimp the collar portion. By doing so, the collar portion and the shank portion are fixed to each other.

In this manner, the recess is formed in the shank portion, and pressure is applied from the outside to the recess of the shank portion from the outer peripheral surface of the collar portion, and the collar portion is crimped to press the collar portion and the shank portion together. Therefore, the shank portion and the collar portion can be securely fixed.

In the invention according to claim 8, the fixing means has a through hole formed at one end of the shank portion, and the flange portion is formed of reinforced plastic so as to be enclosed in the through hole at one end of the shank portion. By doing so, the collar portion and the shank portion are fixed to each other.

As described above, the through hole is formed at one end of the shank portion, and the flange portion is molded with the reinforced plastic so as to be enclosed in the through hole at the one end of the shank portion, so that the flange portion and the shank portion are fixed to each other. Therefore, the productivity can be improved by weighing.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below. << First Embodiment >> FIGS. 1 and 2 show a first embodiment of the present invention. In the figure, 1 is an ejector pin, 2 is a shank portion, and 3 is a collar portion. The shank portion 2 is formed in a rod shape, and a recess 4 is formed in the upper portion. Further, the collar portion 3 is formed in a cap shape, and the through hole 5 is formed from the outer peripheral surface toward the axial center. A caulking pin 6 can be fitted into the through hole 5. Reference numeral 7 is a notch, which is an escape portion for preventing the tip of the bite from reaching the shank portion 2 and damaging the shank portion 2 when the lower end of the collar portion 3 is cut off with a bite or the like to adjust the width of the collar portion 3. Is. The diameter of the recess 4 is larger than that of the through hole 5. In the ejector pin 1 shown in FIG. 1, the tip of the shank portion 2 is fitted into the flange portion 3, the through hole 5 of the flange portion 3 and the recess 4 of the shank portion 2 are aligned, and the caulking pin 6 is inserted into the through hole 5. Insert and push into the recess 4. Thereafter, the caulking pin 6 is externally applied with a pressure by a hydraulic press (which may be a pressure press such as a pneumatic press). Then, the tip of the crimping pin 6 is crushed by the pressure applied from the outside and protrudes in the radial direction, and is crimped as shown in FIG.
By crimping the crimping pin 6 in this way, the crimping portion functions as a stopper so that the crimping pin 6 does not come off from the through hole 5 and pops out, and the tip of the crimping pin 6 is applied from the outside to the shank portion. The second concave portion 4 is pressed and fixed.
Therefore, the shank portion 2 prevents the crimping pin 6 from functioning as a stopper and prevents the crimping pin 6 from coming off the collar portion 3.

<Second Embodiment> FIGS. 3 and 4 show a second embodiment of the present invention. In the figure,
The present embodiment differs from the first embodiment shown in FIG. 1 in that the first embodiment shown in FIG. 1 has one recess 4 in the shank portion 2 and a through hole in the collar portion 3. In contrast to the case of providing one through hole 5, in the present embodiment, one recess is provided on the opposite side of the recess 4, and one through hole is provided on the opposite side of the through hole 5. In the figure, the same parts as those in the first embodiment shown in FIG. 1 are designated by the same reference numerals. In the figure, 1 is an ejector pin, 2 is a shank portion, 3 is a collar portion, 4 is a concave portion,
Reference numeral 5 is a through hole, 6 is a caulking pin, and 7 is a notch. Reference numeral 8 denotes a recess formed in the shank portion 2, which is provided on the side opposite to the recess 4 at a position corresponding to the recess 4. Reference numeral 9 denotes a through hole formed in the collar portion 3, which is provided at a position facing the through hole 5. Reference numeral 10 is a caulking pin, which is inserted into the recess 8 from the through hole 9 like the caulking pin 6.

In the ejector pin 1 shown in FIG. 3, the tip of the shank portion 2 is fitted in the collar portion 3, and the through hole 5 of the collar portion 3 and the recess 4 of the shank portion 2 are further attached. The through hole 9 and the recess 8 of the shank portion 2 are aligned with each other, and the caulking pin 6 is inserted through the through hole 5
And push it into the recess 4 to press the caulking pin 1
0 is inserted into the through hole 9 and pushed into the recessed portion 8. After that, the caulking pin 6 and the caulking pin 10 are simultaneously applied with pressure from the outside by a hydraulic press (as long as a predetermined pressure such as a pneumatic press can be applied). Then, the tips of the caulking pin 6 and the caulking pin 10 are crushed by the pressure applied from the outside and protrude in the radial direction, so that FIG.
It is crimped as shown in. In this way, by caulking the caulking pin 6 and the caulking pin 10, the caulking portion functions as a stopper so that the caulking pin 6 and the caulking pin 10 do not come off from the through holes 5 and 9 and stick out to the outside. The tip and the tip of the crimp pin 10 are fixed by being pressed by the concave portion 4 and the concave portion 8 of the shank portion 2 by the pressure applied from the outside. Therefore, the shank portion 2 prevents the crimping pin 6 and the crimping pin 10 from functioning as stoppers and prevents the crimping pin 6 from coming off the collar portion 3.

<< Third Embodiment >> FIGS. 5, 6, and 7 show a third embodiment of the present invention. In the figure, the difference between the present embodiment and the second embodiment shown in FIG. 3 is that the outer peripheral surface of the collar portion 3 passes through the place where the through holes 5 and 9 are formed and forms a stepped portion in a belt shape. The point is that the ring is formed and the ring is fitted to the step. In the figure, the same parts as those in the second embodiment shown in FIG. 3 are designated by the same reference numerals. In the figure, 1 is an ejector pin, 2 is a shank portion, 3 is a collar portion, 4 is a concave portion, 5 is a through hole, 6 is a caulking pin,
Reference numeral 7 is a notch, 8 is a concave portion, 9 is a through hole, and 10 is a caulking pin. Reference numeral 11 is a band-shaped step portion formed on the outer peripheral surface of the collar portion 3, and reference numeral 12 is a ring formed in a thickness that fits into the step portion 11 and does not project from the outer peripheral surface of the collar portion 3. .
The ring 12 is formed in a strip shape and is used for identifying the difference in material, tolerance, collar diameter, collar width, shank diameter, etc., and the location where the through hole 5 and the through hole 9 of the collar portion 3 are formed. Also used to protect. The ring 12 is composed of a spring ring, and the step portion 1 of the collar portion 3 is formed before the insertion.
The diameter is slightly smaller than the diameter of 1. Therefore, when the ring 12 is inserted into the step portion 11 of the collar portion 3, a force that tightens the step portion 11, that is, presses toward the central axis, acts.

The ejector pin 1 shown in FIG.
The front end of the shank portion 2 is fitted to, the through hole 5 of the flange portion 3 and the recessed portion 4 of the shank portion 2 are further aligned, and the through hole 9 of the flange portion 3 and the recessed portion 8 of the shank portion 2 are aligned, and the caulking pin 6 is attached. It is inserted into the through hole 5 and pushed into the push-in concave portion 4, and the crimp pin 10 is inserted into the through hole 9 and pushed into the push-in concave portion 8. Then, the caulking pin 6 and the caulking pin 10 are hydraulically pressed (as long as a predetermined pressure such as an air pressure press can be applied).
External pressure is applied at the same time. Then, the tips of the caulking pin 6 and the caulking pin 10 are crushed by the pressure applied from the outside and protrude in the radial direction, and are caulked as shown in FIG. In this way, by caulking the caulking pin 6 and the caulking pin 10, the caulking portion functions as a stopper so that the caulking pin 6 and the caulking pin 10 do not come off from the through holes 5 and 9 and stick out of the caulking pin 6. The tip and the tip of the crimp pin 10 are fixed by being pressed by the concave portion 4 and the concave portion 8 of the shank portion 2 by the pressure applied from the outside. Therefore, the shank portion 2 prevents the crimping pin 6 and the crimping pin 10 from functioning as stoppers and prevents the crimping pin 6 from coming off the collar portion 3.
Further, a ring 12 is inserted into the stepped portion 11 for the purpose of identifying the difference in the material, tolerance, flange diameter, flange width, shank diameter and the like of the manufactured ejector pin 1 and is constructed as shown in FIG. By inserting this ring 12 into the stepped portion 11, the through hole 5 and the through hole 9 of the collar portion 3 are protected.

<< Fourth Embodiment >> FIG. 8 shows a fourth embodiment of the present invention. In the figure, 1 is an ejector pin, 2 is a shank portion, 3 is a collar portion, and 7 is a notch. Reference numeral 13 is a male screw formed on the upper end of the shank portion 2, and 14 is a female screw formed on the inner surface of the collar portion 3. The male screw 13 is screwed into the female screw 14. In the ejector pin 1 shown in FIG. 8, the male screw 13 of the shank portion 2 is screwed into the female screw 14 of the collar portion 3 to form the collar portion 3
And the shank portion 2 are fixed. The flange portion 3 and the shank portion 2 can be easily fixed to each other by such means of screwing. If the collar portions 3 and the shank portions 2 are prepared in a standard number in advance, any combination of ejector pins can be immediately manufactured.

<< Fifth Embodiment >> FIG. 9 shows a fifth embodiment of the present invention. In the figure, 1 is an ejector pin, 2 is a shank portion, 3 is a collar portion, and 7 is a notch. The outer diameter of the shank portion 2 is formed to be slightly larger than the inner diameter of the collar portion 3, and the shank portion 2 and the collar portion 3 are fixed to each other by press-fitting the shank portion 2 into the collar portion 3. There is. By doing so, the shank portion 2
The collar portion 3 can be easily fixed to each other.

<< Sixth Embodiment >> FIG. 10 shows a sixth embodiment of the present invention. In the figure, 1 is an ejector pin, 2 is a shank portion, 3 is a collar portion, and 7 is a notch. Reference numeral 15 is an adhesive for fixing the shank portion 2 to the collar portion 3 when the shank portion 2 is fitted to the collar portion 3. By fixing the shank portion 2 to the inside of the collar portion 3 with the adhesive 15 in this manner, the shank portion 2 and the collar portion 3 can be easily fixed to each other.

<< Seventh Embodiment >> FIG. 11 shows a seventh embodiment of the present invention. In the figure, 1 is an ejector pin, 2 is a shank portion, 3 is a collar portion, 4 is a concave portion, 7 is a notch, and 8 is a concave portion. In the ejector pin 1 shown in FIG. 11, the tip of the shank portion 2 is fitted to the collar portion 3,
Pressure is applied simultaneously from the outer peripheral portion of the collar portion 3 toward the concave portion 4 of the shank portion 2 and the concave portion 8 of the shank portion 2 by a hydraulic press (which may be a pressure press such as a pneumatic press) from both sides. . Then, the portion of the collar portion 3 to which pressure is applied by the hydraulic press is recessed inside, and projections 16 and 17 are formed on the inner surface. The projection 16 fits into the recess 4 and the projection 17 fits into the recess 8. . In this manner, the projections 16 and 17 are fitted into the recesses 4 and 8 of the shank portion 2 by crimping the wall surface of the flange portion 3 toward the recesses 4 and 8 of the shank portion 2 as described above, and the recesses 4 and 8 are formed. It is pressed and fixed in place. For this reason, in the shank portion 2, the protrusions 16 and 17 serve as stoppers and are prevented from coming off from the collar portion 3.

<< Eighth Embodiment >> FIGS. 12 and 13 show an eighth embodiment of the present invention. Figure 1,
The points different from the respective embodiments shown in FIGS. 3, 5, 8, 9, 10, and 11 are that the shank portion 2 and the collar portion in the first to seventh embodiments are different. 3 is composed of the same member, the present embodiment is that the collar portion 3 is composed of reinforced plastic (FRP). In the figure, reference numeral 40 denotes an ejector pin, and a collar portion 30 is provided at the tip of the metal shank portion 20 by using a resin mold (not shown). The collar portion 30 has a shank portion 2
It is formed so that the reinforced plastic is enclosed in the through-hole 21 formed at the tip of 0. By doing so, as shown in FIG. 13, the reinforced plastic enclosed in the through hole 21 formed at the tip of the shank portion 20 is prevented from coming off the shank portion 20 from the collar portion 30.

[0032]

According to the invention described in claim 1, it is possible to finish the standard dimension in advance according to the thickness of the collar portion, and prepare the diameter of the shank portion in advance according to the standard dimension. The diameter and length of the shank portion can be easily selected according to the diameter and thickness of the collar portion, and the manufacturing cost can be significantly reduced.

According to the second aspect of the present invention, the collar portion and the shank portion can be securely fixed to each other, the manufacturing can be performed efficiently, and the cost can be reduced.

According to the third aspect of the present invention, it is possible to easily identify the material, the tolerance and the like by properly using the color of the ring, and it is possible to prevent an error in delivery.

According to the invention described in claim 4, the shank portion and the collar portion can be easily fixed.

According to the invention described in claim 5, the shank portion and the collar portion can be securely fixed.

According to the invention described in claim 6, manufacturing is easy.

According to the seventh aspect of the invention, the shank portion and the collar portion can be securely fixed.

According to the invention described in claim 8, the productivity can be improved by measuring.

[Brief description of drawings]

FIG. 1 is a partially sectional assembly view of an ejector pin according to a first embodiment of the present application.

FIG. 2 is a sectional view of the ejector pin shown in FIG. 1 in an assembled state.

FIG. 3 is a partially sectional assembly view of an ejector pin according to a second embodiment of the present application.

4 is a sectional view of the ejector pin shown in FIG. 3 in an assembled state.

FIG. 5 is a partially sectional assembly view of an ejector pin according to a third embodiment of the present application.

6 is a sectional view of the ejector pin shown in FIG. 5 in an assembled state.

FIG. 7 is a perspective view of the ejector pin shown in FIG.

FIG. 8 is a partially sectional assembly view of an ejector pin according to a fourth embodiment of the present application.

FIG. 9 is a partially sectional assembly view of an ejector pin according to a fifth embodiment of the present application.

FIG. 10 is a partially sectional assembly view of an ejector pin according to a sixth embodiment of the present application.

FIG. 11 is a partial cross-sectional assembly view of an ejector pin according to a seventh embodiment of the present application.

FIG. 12 is a diagram showing a manufacturing process of the ejector pin according to the eighth embodiment of the present application.

13 is a cross-sectional view of the ejector pin shown in FIG.

FIG. 14 is an overall perspective view of a conventional ejector pin.

[Explanation of code] 1 ………………………………………………………… Ejector pin 2 …………………………………………………… Shank part 3 ………………………………………………… Tsuba part 4 …………………………………………………… Recess 5 ………………… …………………………………… Through hole 6 …………………………………………………… Caulking pin 7 …………………………………… …………… Notch 8 …………………………………………………… Recess 9 …………………………………………… Through hole 10 ……………………………………………… Caulking pin 11 ……………………………………………… Step 12 12 ………………………… …………………………… Ring 13 ……………………………………………… Male thread 14 ………………………………………… … Female thread 15 …………………………………………………… Adhesive 16 ……………………………………………… Protrusion 17 ……………… …………………………………… Protrusion 20 ……………………………………………… Shank 21 ……………………………………… ……… Through hole 30 ……………………………………………… Collar 40 ……………………………………………… Ejector pin

Claims (8)

[Claims] 1. An ejector pin composed of a collar portion and a shank portion, wherein the collar portion is formed in a cap shape, and the shank portion is formed in a rod shape, and is configured as a separate member,
An ejector pin in which the collar portion is fixed to the shank portion by a fixing means. 2. The fixing means forms a through hole in the collar portion from the outer peripheral surface toward the axial center, forms a recess in the shank portion, and fits one end of the shank portion into the collar portion,
2. A crimping pin is fitted through the through hole of the collar part and fitted in the recess of the shank part, and pressure is applied from the outside to caulk the caulking pin to fix the collar part and the shank part. The ejector pin shown. 3. The ejector pin according to claim 2, wherein a step portion having a small diameter is formed on a peripheral surface passing through a portion where the through hole of the collar portion is formed, and a ring is fitted to the step portion. 4. The fixing means has a female screw formed on the inner peripheral surface of the collar portion and a male screw formed on the outer peripheral surface at one end of the shank portion.
The ejector pin according to claim 1, wherein the collar portion and the shank portion are fixed to each other by screwing the collar portion into the shank portion. 5. The fixing means is configured such that an outer diameter of one end of the shank portion is slightly larger than an inner diameter of the collar portion and the shank portion is press-fitted into the collar portion so that the collar portion and the shank portion are fixed to each other. The ejector pin according to claim 1, which is a thing. 6. The fixing means is adapted to fix the flange part and the shank part by applying an adhesive to the inner surface of the flange part and fitting one end of the shank part to bond them. The ejector pin according to 1. 7. The fixing means forms a recess in the shank portion, and externally applies pressure from the outer peripheral surface to the recess portion of the shank portion to crimp the flange portion and press-fit the collar portion to the shank portion. The ejector pin according to claim 1, wherein the ejector pin is fixed to the portion. 8. The fixing means comprises a through hole formed at one end of the shank portion, and the flange portion is molded at the one end of the shank portion with a reinforced plastic so as to be enclosed in the through hole. The ejector pin according to claim 1, wherein the ejector pin is fixed to the portion.