JP5501116B2 - Blow molding method - Google Patents

Description

  The present invention relates to a blow molding method capable of simultaneously molding two products with one molding machine.

  Conventionally, a set of molds is attached to a molding machine, the parison extruded from the crosshead is closed with a pinch, the parison is blown up and then sandwiched between molds to mold one product in one shot It has been known.

In addition, as a blow molding method, as described in Patent Document 1, one mold clamping mechanism, a plurality of molds (first and second molds), and the mold itself separately from the mold clamping mechanism. A mold opening prevention mechanism that keeps the mold clamped, a mold moving mechanism that selectively allows multiple molds to face the mold clamping mechanism, and a parison to the mold set in the mold clamping mechanism There is known a method of forming a large number of molded products by using a parison supply / blowing mechanism that presses and sharing a single mold clamping mechanism among a plurality of molds.

JP 2003-11214 A

However, in the method of molding one product in one shot, the yield is good for a product of a size suitable for the molding machine, but the yield is poor for a product smaller than that size.
Further, in the method described in Patent Document 1, although a single mold clamping mechanism is shared by a plurality of molds, a product having a size or less suitable for the mold clamping mechanism has a low yield and productivity ( Cycle time) is not improved.

  The present invention has been made in view of such problems of the prior art, and an object of the present invention is to provide a blow molding method that improves production efficiency such as yield and cycle time. is there.

In order to solve the above-mentioned problem, the invention according to claim 1 attaches two molds for molding the same product to the mold mounting plate of one molding machine in the vertical direction, and supplies a parison to these molds. In the blow molding method of simultaneously molding two products, the left and right mold mounting plates of the mold mounting plates are arranged so that the molds forming one surface of the products are oriented 180 degrees in the vertical direction. The molds forming the other surface of the product were mounted on the other mold mounting plate while changing their orientations 180 degrees in the vertical direction.

The two types of molds can be attached to the mold mounting plate such that their product surfaces are in the same direction and the shift width of the mold dividing surfaces is minimized.

According to the first aspect of the present invention, two products that are out of the size of the molding range appropriate for the molding machine are molded simultaneously in one shot, so that the production efficiency (yield and cycle time) can be improved. In addition, the application range of product sizes that can be molded by an existing molding machine can be expanded.

If two types of molds are mounted on the mold mounting plate so that their product surfaces are in the same direction and the shift width between the mold split surfaces is minimized, the quality between the two molded products Variation can be reduced, and the releasability can be improved.

Sectional drawing of the shaping | molding apparatus which implements the blow molding method which concerns on this invention In the explanatory diagram of the mold layout, (a) is the left mold that forms the A side of the product in the same direction in the vertical direction, (b) is the left mold that forms the A surface of the product in the vertical direction When the direction is changed by 180 degrees, (c) is when the left mold that forms the A side of the product and the left mold that forms the B side are turned 180 degrees in the left-right direction, and (d) is the product When the left molds forming the B side of each other are turned 180 degrees in the left-right direction It is an operation explanatory view of a blow molding method concerning the present invention, (a) attaching a mold, (b) extruding a parison, (c) blowing air into the parison, (d) a product by clamping Simultaneous molding of two

  Embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, a molding apparatus 1 for performing a blow molding method according to the present invention includes a molding machine 2, a first mold 3 and a second mold 4 attached to the molding machine 2, and these molds. The crosshead 6 pushes out the parison 5 to be supplied to 3 and 4, the upper chuck 7 that closes the upper end 5 a of the parison 5, the lower pitch 8 that closes the lower end 5 b of the parison 5, and the like.

  The molding machine 2 includes a mold clamping mechanism 9 and a blowing mechanism 10. The first mold 3 and the second mold 4 are respectively composed of left molds 3a and 4a and right molds 3b and 4b, and are attached to the molding machine 2 via left and right mold attachment plates 11a and 11b. Then, the same product is molded by the first mold 3 and the second mold 4.

The outer shape of the product consists of A and B surfaces. The A surface is molded with the left molds 3a and 4a, and the B surface is molded with the right molds 3b and 4b. Alternatively, the A surface can be molded with the right molds 3b and 4b, and the B surface can be molded with the left molds 3a and 4a.

Furthermore, of the two products to be molded at the same time, one side A can be molded with the left mold 3a of the first mold 3, and the other side A can be molded with the right mold 4b of the second mold 4. However, the reverse is also possible, and the way of combination is arbitrary.

Further, the left and right molds 3a and 3b constituting the first mold 3 and the left and right molds 4a and 4b constituting the second mold 4 have the same product surface, and the mold dividing surfaces of each other. It is attached to the left and right mold attachment plates 11a and 11b so that the deviation width is minimized.

  The mold layout when the left and right molds 3a and 3b constituting the first mold 3 and the left and right molds 4a and 4b constituting the second mold 4 are attached to the mold attachment plates 11a and 11b is shown in FIG. As shown in FIG. 2, by providing mounting holes (not shown) for the molds 3a, 3b, 4a and 4b in the mold mounting plates 11a and 11b, it is possible to arrange them vertically and horizontally.

FIG. 2A shows that the left molds 3a and 4a, both of which form the A surface of the product, are mounted in the same direction in the vertical direction on the left mold mounting plate 11a, and the B mold is mounted on the right mold mounting plate 11b. This is a case where the right molds 3b and 4b forming the same are attached in the same direction in the vertical direction.

FIG. 2 (b) shows that the left mold mounting plate 11a is mounted with left molds 3a and 4a, both of which form the A surface of the product, being turned 180 degrees in the vertical direction, and the right mold mounting plate 11b. Is the case where the right molds 3b and 4b forming the B surface are mounted with their directions changed by 180 degrees in the vertical direction.

  FIG. 2 (c) shows that the left mold 3a that forms the A surface of the product and the left mold 4a that forms the B surface are attached to the left mold mounting plate 11a by changing the direction by 180 degrees in the left-right direction. This is a case where the right mold 3b for forming the B surface and the right mold 4b for forming the A surface are mounted on the right mold mounting plate 11b by changing the direction by 180 degrees in the left-right direction.

  FIG. 2 (d) shows that the left mold mounting plate 11a is mounted with left molds 3a and 4a, both of which form the B surface of the product, turned 180 degrees in the left-right direction, and the right mold mounting plate 11b. Is the case where the right molds 3b and 4b forming the A surface are attached with their directions changed by 180 degrees in the left-right direction.

  Thus, although it is possible to arrange the first mold 3 and the second mold 4 vertically and horizontally, it is possible to reduce the variation in quality between the two molded products and to separate them. The mold layout shown in FIG. 2B is desirable compared to other mold layouts because the moldability can be improved.

  A blow molding method according to the present invention performed by the molding apparatus 1 configured as described above will be described. First, as shown in FIG. 3 (a), left and right molds 3a and 3b constituting the first mold 3 and left and right molds constituting the second mold 4 on the left and right mold mounting plates 11a and 11b. Attach 4a and 4b. A mold layout shown in FIG. 2B is used as the mold layout.

  Further, the left and right molds 3a and 3b constituting the first mold 3 and the left and right molds 4a and 4b constituting the second mold 4 have the same product surface, and the mold dividing surfaces of each other. It is attached to the left and right mold attachment plates 11a and 11b so that the deviation width is minimized.

Next, as shown in FIG. 3B, the parison 5 is pushed out by the cross head 6 and supplied between the left molds 3a, 4a and the right molds 3b, 4b in the mold open state.

  Next, as shown in FIG. 3 (c), the lower ends 5 b of the parison 5 are closed at the lower pitch 8, and air is blown into the parison 5 by the blowing mechanism 10 to be inflated. Transferability to the left and right molds 4a and 4b constituting the second mold 4 and 3a and 3b is imparted.

Next, as shown in FIG. 3 (d), the upper end 5a of the parison 5 is closed by the upper chuck 7, and the first mold 3 and the second mold 4 are clamped by the mold clamping mechanism 9 to expand the parison 5. The resin is transferred between the left and right molds 3 a and 3 b constituting the first mold 3 and the left and right molds 4 a and 4 b constituting the second mold 4. Then, two products W are simultaneously molded by the first mold 3 and the second mold 4.

According to the present invention, two products that are out of the size of the molding range appropriate for the molding machine are simultaneously molded in one shot, so that it is possible to provide a blow molding method capable of improving production efficiency (yield, cycle time). .

DESCRIPTION OF SYMBOLS 1 ... Molding apparatus, 2 ... Molding machine, 3 ... 1st metal mold | die, 3a, 4a ... Left metal mold | die, 3b, 4b ... Right metal mold | die, 4 ... 2nd metal mold | die, 5 ... Parison, 6 ... Crosshead, 9 ... Clamping mechanism, 10 ... Blowing mechanism, 11a, 11b ... Mold mounting plate, W ... Product.

Claims (2)

A blow molding method in which two types of molds for molding the same product are mounted vertically on a mold mounting plate of one molding machine, and two products are molded simultaneously by supplying a parison to these molds. The molds forming one surface of the product are mounted on the left and right mold mounting plates of the mold mounting plates, with the direction of each other being changed by 180 degrees, and the other mold mounting plate is mounted on the product. A blow molding method characterized in that the molds forming the other surface of the mold are attached to each other with the direction thereof being changed by 180 degrees in the vertical direction . In blow molding method according to claim 1, the mold of the two equations, blow molding process, characterized in that attached to the mold mounting plate as deviation of the mold parting plane of each other is minimized .

Images