JPS6050572B2 - Transfer molding machine plunger - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressurizing flansha that is attached to a cylinder rod of a cylinder provided in a transfer molding machine, and more specifically, the present invention relates to a pressurizing flancher that is attached to a cylinder rod of a cylinder provided in a transfer molding machine. Regarding the mobile Franscher.

For transfer molding machines, if the axes of the mold and the flancier head attached to the cylinder rod of the cylinder are not aligned with each other, the flancier head will not fit properly into the pot of the upper mold. Since molding operations cannot be carried out smoothly, the positioning of the mold is extremely important.

Traditionally, mold positioning involves drawing a marking line on the holster plate on which the lower mold is placed and placing it on the holster plate, or measuring the distance from the end of the plate to roughly determine the position, and then placing the lower mold on the pot. Fine adjustments were made by hitting both the upper and lower molds with a hammer or the like so that the Franscher head would fit properly. Therefore, it has the disadvantage that the work is extremely complicated and requires skill. However, in the past, there was little need to replace the mold once it was positioned and fixed, so the above-mentioned drawbacks were overlooked without being considered a serious problem. In addition, it is difficult to achieve positioning accuracy with fine adjustments using a hammer, etc.
Due to misalignment between the flancier head and the pot, so-called galling was likely to occur on the flancier head or the inner wall of the pot, but this drawback did not make the molding operation itself impossible. This was overlooked without being considered a major problem. However, in recent years, transfer molding has become increasingly automated, and it has become necessary to match the operations of other machines. It is impossible to carry out molding work unless the positioning accuracy is as high as possible, and it has also become necessary to frequently replace molds. In order to meet this need, both the upper and lower molds are positioned and fixed by bringing the lower mold into contact with an abutting member provided on the holster plate via a liner, and the liner is removed before the molding operation. A positioning method can be considered in which a gap is created between the lower mold and the abutment member by removing the abutting member. Depending on this positioning method,
This allows for easy and accurate positioning, and even if the lower mold expands thermally during molding, it does not come into contact with the abutment member, so it does not deform, and the center of the mold does not shift and the plunger head is always aligned. It will be located on the extension of the axis of However, although this positioning method achieves higher accuracy than conventional methods, it is difficult to perfectly align the axes of the plunger head and the pot, and although this does not pose a problem to the molding operation, It is inevitable that there will be some deviation between the two axes. However, with conventional plungers, the entire plunger is integrated and the head cannot be moved in the radial direction with respect to the cylinder rod, so the above-mentioned slippage could not be eliminated unless the mold was moved. The present invention was made in view of the above circumstances, and the present invention corrects the slight misalignment of the axes of the plunger head and the pot by moving the plunger head within a predetermined range in the radial direction. The purpose of the present invention is to provide a plunger for a transfer molding machine that can solve the problem without moving and perform molding work with the axes always aligned. A shaft body is attached to the rod so that their axes coincide with each other, a frame body is attached to this shaft body so that their axes coincide with each other, and a certain amount of space is attached to this frame body so that it can move in the radial direction. The plunger is constituted by a head supported with play.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In Fig. 1, reference numeral 1 denotes a transfer molding machine, in which an upper mold fixing device fixes a bolster plate 7 on which a lower mold 2 is placed and an upper mold 5 in which a pot 4 (see Fig. 2) is formed. It is equipped with a stand 6.

The polster plate 7 has four guide posts 8a and 8b.
(However, only two are shown) It is supported so that it can be moved up and down and stopped at a predetermined position. Further, a cylinder 9 is fixed to the upper die fixing base 5. A plunger 11 is screwed into the cylinder rod 10 of the cylinder 9. As is clear from FIG. 2, the plunger 11 has a mounting shaft 12 which is a shaft body that is screwed onto the cylinder rod 10 so that their axes coincide with each other. A through hole 13 is provided so as to pass through. A female thread 14 is carved in the upper end of the through hole 13,
Further, a diameter reducing step 15 is formed at the center thereof. A push pin 16 is loosely inserted into the through hole 13, and the push pin 16 is connected to a coil spring disposed between its head 17 and an adjustment screw 18 screwed into the female thread 14. It is urged downward by the elastic force of 19. The downward movement range of the push pin 16 is restricted by the head 17 coming into contact with the diameter reduction step 15. 21a and 21b are a pair of frame pieces obtained by dividing the frame body 20 (see Fig. 3) into two along the axis line, each of which has upper end protrusions 22a, 22b and lower end protrusions 23a, 23b formed on its inner peripheral surface. The upper end protrusions 22a and 22b are fitted and supported in an annular groove 24 recessed in the lower part of the mounting shaft 12, respectively.

When the frame pieces 21a and 21b are brought into contact with each other and supported in the frame 20 as described above, the outer diameter of the frame 20 matches the outer diameter of the upper wall of the annular groove 24 of the mounting shaft 12, and The axes of are also coincident. 25 is a slide frame that prevents each of the frame pieces 21a, 21b from separating from the mounting shaft 12, and each of the frame pieces 21a, 21b
When the frame pieces 21a, 21 are slid along the mounting shaft 12 to a position that does not correspond to the position shown in FIG.
b is separable and can be separated from the annular groove 24 respectively.

26 is a head, and an annular groove 27 is recessed in the upper part of the head.
Each lower end protrusion 23a, 23 of each frame piece 21a, 21b
By fitting b, each of the frame pieces 21a, 21b
becomes a frame 20 shape, each of the lower end protrusions 23a,
The upper wall of the annular groove 27 is in sliding contact with and supported on the upper surface of the annular groove 23b.

The outer diameter of the upper part of the head 26 is 2 times larger than the inner diameter of the frame 20.
The diameter of the annular groove 27 is also set to be smaller than the inner diameter of the lower end projections 23a, 23b of the frame body 20 by 2e. By being pushed downward by the mounting shaft 12, the mounting shaft 12 faces the lower surface of the mounting shaft 12 with a slight distance therebetween. Therefore, the head 26 is attached to each frame piece 2.
1a and 21b, when supported so as to coincide with the axis of the mounting shaft 12, it is movable in the radial direction by an amount of play corresponding to the opposing distance e caused by the radial difference 2e described above. A male thread 28 is carved on the outer circumferential surface of the central portion of the head 26, and an annular first step portion 29 and a second step portion 30 are formed at the lower portion, respectively. A synthetic resin ring 31 having excellent heat resistance and abrasion resistance and having an inner circumferential shape that follows the outer circumferential shape of each of the stepped portions 29 and 30 is placed at a position corresponding to each of the stepped portions 29 and 30. The second step portion 30 is fitted in such a manner that it cannot be removed downwardly. The synthetic resin ring 31 is prevented from coming off upward by a tightening nut 32 that is threaded onto the male thread 28. The outer diameter of the synthetic resin ring 31 is formed to be slightly larger than the inner diameter of the pot 4 of the upper mold 5, and the outer diameter of the tightening nut 32 is formed to be slightly smaller than the inner diameter of the pot 4. There are things that exist. Since this embodiment is configured as described above, even after positioning the upper and lower molds 5, 2 by an appropriate method, the pot 4 and the head 2 still remain.
If the axes of the two axes 6 are slightly misaligned, the axes can be brought into alignment by moving the head 26 in a direction that eliminates the misalignment.

The corrected proper position will be maintained unless a force greater than the pressing force of the push pin 16 due to the elastic force of the coil spring 19 is applied. If the above-mentioned deviation is extremely small, it will be automatically eliminated by being guided by the inner peripheral surface of the pot 4 when the head 26 is fitted into the pot 4. In addition, by forming the outer diameter of the synthetic resin ring 31 to be slightly larger than the inner diameter of the pot 4, when the plunger 11 is moved up and down by the cylinder 9 and the synthetic resin ring 31 is inserted into the pot 4, the synthetic resin ring 31 is inserted into the pot 4. The excess thickness of 31 is scraped off by the inner peripheral surface of pot 4, making it possible to form synthetic resin ring 31 having an outer diameter that perfectly matches the inner diameter of pot 4. Therefore, the tablet-shaped thermosetting resin 33 placed in the pot 4 is pressurized by the head 26, gelled, and placed inside both the upper and lower molds 5, 2 in the mold-clamped state (see Fig. 2). When molding by pouring into a mold, backflow of the highly fluid thermosetting resin 33 can be extremely effectively prevented. Further, when the synthetic resin ring 31 becomes worn due to long-term use, only this ring 31 needs to be replaced, and the other members of the plunger 11 can continue to be used as they are.
To replace the synthetic resin ring 31, slide the slide frame 25 upward to remove the frame pieces 21a and 21b without removing the mounting shaft 12 from the cylinder rod 10, remove the head 26, and tighten the tightening nut 32. This can be easily done by removing the . In this way, according to the present invention, slight misalignment of the axes of the plunger head and the plunger can be eliminated by moving the plunger head in the radial direction, so that the plunger is always The head and pot are properly fitted,
There is an effect that a so-called /11) gap is generated on the plunger head or the inner wall of the pot, and smooth and accurate molding work can be performed.

The present invention has been variously explained above using preferred embodiments, but it goes without saying that the present invention is not limited to the above-mentioned embodiments. Of course, modifications can be made.

[Brief explanation of the drawing]

The figures show preferred embodiments of the present invention, with Fig. 1 being an overall front view of the transfer molding machine, Fig. 2 being an enlarged vertical sectional view showing the plunger and the pot, and Fig. 3 showing the divided state of the frame. FIG. 1... Transfer molding machine, 2... Lower mold, 4...
... pot, 5 ... upper mold, 6 ... upper mold fixing stand,
7... Bolster plate, 8a, 8b... Guide post, 9... Cylinder, 10... Cylinder rod, 11... Plunger, 12... Mounting shaft, 1
3... Through hole, 14... Female thread, 15... Diameter reduction step, 16... Push pin, 17... Head, 18... Adjustment screw, 19... Coil spring, 20... Frame body, 21a, 21b... Frame piece, 22a, 22b... Upper end protrusion, 23a, 23b... Lower end protrusion, 24... Annular groove, 25... Slide frame, 26...Head, 27
... Annular groove, 28 ... Male thread, 29 ... First step section, 30 ... Second step section, 31 ... Synthetic resin ring, 3
2... Tightening nut, 33... Thermosetting resin.

Claims (1)

[Claims] 1. A shaft body attached to the cylinder rod of a cylinder provided in a transfer molding machine so that their axes coincide with each other, a frame body that is attached to this shaft body so that their axes coincide with each other, and this frame body. 1. A plunger for a transfer molding machine, comprising a head supported with some play so as to be movable in a radial direction.