JPH0373326A - Sliding type exchanging device of die - Google Patents

Abstract

PURPOSE:To enhance the efficiency of multi-kind small quantity production and improve the safety of the device concerned by a method wherein the exchange of rubber extruder die is performed by horizontal or vertical sliding system and the pressure of an oil hydraulic cylinder is specified. CONSTITUTION:A die 2A, which is expected to be used next time, is supported by a die exchange supporting plate 4 together with a die 2 so as to be positioned at the right side of the plate 4. When the exchange of the die 2 is intened, die press screws 6 are unscrewed and the oil hydraulic pump 5 at the right side of the plate 4 is actuated so as to press the die 2 leftwards out of the place and push the next die 2A in the predetermined position in order to start intrusion. After that, said oil hydraulic cylinder 5 is brought back to its initial position. When the vertical sliding is performed, a mechanism similar as mentioned above is employed. The pressure of the oil hydraulic cylinder at the sliding type die exchange lies within the range represented by the formula PC=PHXdXR, in which PC is the pressure of the oil hydraulic cylinder in kg/cm<2>, PH is the pressure of a head at extrusion in kg/cm<2>, (d) is the inner diameter of an extruder cylinder in cm, and R is the constant of 1-1.5.

Description

[Detailed Description of the Invention] (Field of Industrial Application) Rubber extrusion molded products related to the present invention are protectors for various high-pressure hoses for automobiles (Freon hoses, brake hoses, power steering hoses, radiator hoses, etc.) and various electrical wiring and cables. , steel pipes for refrigerators, cold water pipes for buildings, solar system pipes, insulation materials for air conditioners and car air conditioner pipes, sealing materials for sash frames for residential hills, gaskets for openings such as doors, gaskets for building panels, glass greenhouses. Sealing materials, automobile backing materials, weather strips, backing materials for cooler air conditioners, copy machine paper feed rolls, vegetable and fruit sorting machine rolls, road joint backup materials, fishing rod grips, grass mower grips, box culverts. Sponge rubber used as joint gaskets for gas turbines, gaskets for gab systems, door gaskets for generators, damping materials for coolers, termite prevention materials for housing, sealing materials for folded roofs, and waterproofing materials on building rooftops. This applies to solid rubber and thick film rubber adhesives.

(Prior Art) The current state of rubber extrusion molded products related to the present invention can be roughly divided into those related to automobiles, light electrical appliances, housing, and others.

First of all, the current situation in the automobile industry is that in terms of delivery, it is easy to use quick delivery methods and short delivery times (orders are received and shipped immediately). Furthermore, in terms of price, we are forced to carry out periodic cost reduction measures every year.

In terms of quality, zero defects are required.

Next, light electrical appliances are exactly the same as automobiles. In other words, in terms of delivery, there is a need for short delivery times, in terms of price, it is necessary to reduce costs, and in terms of quality, there is a need for zero defects.

The housing-related issues are almost the same as those related to automobiles and light electrical appliances.

(Intelligence B to be Solved by the Invention) The current number of rubber extrusion molded products totals approximately 1,500 types. At present, the following problems can be raised:

First, in order to deal with high-mix, low-volume production, it is necessary to replace dies for extrusion molded products, and it takes time to replace the dies. The reason for this is that in the conventional die changing method, the rubber extrusion molding machine is stopped and the 9th
As shown in Figures 11 to 11, the eight cap screws 10 are removed, the die 2 is removed, the die to be used next is set, the cap screws 10 are tightened and fixed, and extrusion molding is started. be.

Therefore, it takes 30 minutes to change the dice once, so if you change the dice four times a day, it will take 120 minutes (30 minutes x 4 times), compared to the machine operating time of 480 minutes a day. teeth,
This is a situation where the machine stops.

The machine operating rate is 75%, and the current ideal productivity (machine operating rate of 90-95%) in the era of high-mix, low-volume production is
It's a long way off.

Therefore, from an economic point of view, a loss in personnel costs occurs due to poor die switching efficiency.

The second issue is safety.

When replacing the dice, remove the 8 cap screws, but when you finish removing them, the dice may fall. Since the weight of the dice is 1.5 to 5 kg/piece, 1-1.
The fall from a height of 2 meters could sometimes lead to disasters such as injury to humans.

(Means for Solving the Problems) In order to solve the problem that it takes 30 minutes to change dies, the present invention changes the die replacement method from a cap screw one-way method to a sliding method using a hydraulic cylinder. be.

The present invention relates to a rubber extrusion mold, in which a die for the rubber extrusion mold is equipped with a plurality of hydraulic cylinders at both ends, and the die is switched by sliding it left and right or up and down. Device.

In the die sliding type exchange device of the present invention, the hydraulic pressure of the hydraulic cylinder at the time of die exchange is PC-PHXdXR, where -P = hydraulic cylinder pressure (Kg/cm"),
P, l: Head pressure during extrusion (Kg/cm"), d:
Extruder cylinder inner diameter (cm) R: Preferably, the range is expressed by a constant of 1 to 1.5.

In the rubber extrusion molding of the present invention, the number of molding holes per piece is 2 to 5, and it is preferable to switch a plurality of dies at the same time.

(Configuration) An embodiment of the apparatus of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a die exchanging device of the present invention that slides dice in the left-right direction, and FIGS. 2 and 3 are front and side views of the same type of die exchanging device of the left-right sliding type.

In the figure, reference numeral 1 indicates a head of a rubber extruder, and reference numeral 2 indicates a die fitted into a slide groove 3 in the head 1. The die 2 is fitted and supported by the support plate 4 for die replacement fixed to the head, and when exchanging the die, loosen the die holding screw 6 and move the die 2 into the slide groove 3 of the support plate 4.
and 4A as a guide, the die 2 is pushed left and right by a hydraulic cylinder 5 to displace and replace the die 2. 7 indicates a die hole.

FIG. 4, FIG. 5, and FIG. 6 are a perspective view, a front view, and a side view of a die changing device of the present invention, which switches the dice by sliding them up and down.

The same reference numerals as in FIGS. 1 to 3 indicate the same configurations.

Figure 7 cx), (n), [:I[I) and Figure 8 (1)
cn] and (III) respectively show exemplary embodiments of a left-right sliding type and a vertical sliding type die changing device of the present invention. In FIG. 7 (1), 2A is a die scheduled to be used next time, and it is shown that it is held on the die replacement support plate 4 together with die 2 and is located on the right side. When replacement is required, the hydraulic pump 5 on the right side is activated, the die 2 is extruded to the left, and the next die 2 is pushed into a predetermined position to start the next press molding. For this reason, the hydraulic cylinder 5 returns to its original position in the right direction, as shown in FIG. 7 (I[[), and waits for the next operation.

In FIG. 8, the die shown in FIG. 7 is exchanged up and down, so the operation is the same as that shown in FIG.

The die 2 is moved by being guided by the slide groove 3 of the groove 1 between the die support plate 4 and the head 1, which are provided in advance on the head 1, and the slide groove 4A of the support plate 4. A convex portion is provided on the die side for the purpose of assisting the movement of the die smoothly, and a slide groove 3 is also provided on the head side.

Then, the die 2 is replaced by sliding the die 2 with the hydraulic cylinder 5 at the same time as pressing the die insert 2A scheduled for next use.

Hydraulic pressure in hydraulic cylinder is 300-900 Kg/cm
" is within the normal range and the thickness of the die is 411111 or more. This means that the oil pressure is 300 to 900 Kg/cta"
It is thick enough to withstand

After exchanging the dice, the state is as shown in FIG. 7 (II), and the die 2 is removed and the next die is attached. After that, when exchanging fire dice, use Figure 7 (III).
The die is changed by pushing it with a hydraulic cylinder from the opposite side (left side in Figure 7) and sliding it.

The above explanation is for the case of sliding left and right, but the mechanism for sliding up and down is the same as that for sliding left and right.

(Example) Next, examples and comparative examples will be described.

A hydraulic cylinder was used to replace the dies, each of which had two molding openings, in a sliding manner. The oil pressure of the hydraulic cylinder at that time was 350 kg/c-.

The extrusion conditions immediately before exchanging the die are as follows.

The head pressure of the extruder was 50 Kg/c-, and the extruder cylinder inner diameter was 70 m1+.The screw rotation was stopped, and after 20 seconds, after confirming that the contents were not discharged from the extruder die part, the slide type die was Exchange is now possible.

In addition, an attempt was made to replace the slide of the seven 13L dies, each of which has two molding openings, with an oil pressure of 250 kg/c, but the dies did not move due to the lack of oil pressure in the hydraulic cylinder.

The extrusion conditions immediately before exchanging the die are as follows in Example 1.
is the same as

Each Sogei Banbi die had two molding openings, and the die was replaced in a sliding manner using a hydraulic cylinder. The oil pressure of the hydraulic cylinder at that time was 1500 Kg/c-.

The extrusion conditions immediately before exchanging the die are as follows.

The head pressure of the extruder was 150 Kg/e-, and the extruder cylinder inner diameter was 1001I11. After 90 seconds, the screw rotation was stopped and after confirming that the contents were not discharged from the extruder die, the sliding die was replaced. became possible.

41 If the oil pressure exceeds 3000 Kg/c-, the pump output will exceed 150 Kg/cta, resulting in poor versatility, and the space for the hydraulic cylinder and hydraulic unit will no longer be appropriate, making it difficult to replace the die. This has a negative impact on the economic efficiency in terms of the time required.

The dies having 2 to 5 molding ports per Uararan group main die were replaced in a sliding manner using a hydraulic cylinder. The oil pressure at that time was 800Kg/c- when there were two molding ports.
When there were 5 molding holes, it was 950 Kg/cm''.

The extrusion conditions immediately before exchanging the die are as follows.

The head pressure of the extruder is 80 to 95 Kg/c-, the extruder cylinder inner diameter is 1001, and after 90 seconds the screw rotation is stopped and it is confirmed that the contents are not discharged from the extruder die part, the slide type Dice can now be exchanged.

1.4 When the number of molding ports per die was six or more, the head pressure during extrusion became unstable and the dimensional stability of the molded product could not be maintained.

Dimensions are normally kept within tolerance ±10%, but if there are 6 or more molding holes per die, dimensional variations will occur.
It became 15%.

As shown in Examples 1 and 2.3 above, the number of molding ports per die is 5 or less, and Pe=PoXdXR
(pc i hydraulic cylinder pressure (Kg/cm"), P i: head pressure during extrusion (Kg/cm"), d: extruder cylinder inner diameter (cm), R: constant of l~1.5) If a hydraulic cylinder with appropriate hydraulic pressure is installed properly, die exchange will be possible smoothly.
I was able to safely exchange the dice in 5 minutes without dropping them.

(Effects of the Invention) As described above, by changing the die exchange method of the present invention from the method of fixing with a cap screw to the slide method, the extrusion By setting the die for the next extrusion when there is free time, the die change can be completed in just 5 minutes, which reduces the loss in efficiency of productivity in order to cope with high-mix, low-volume production. We are now able to handle high-mix, low-volume production quickly and smoothly.

That is, the machine operating rate was approximately 92%, and the ideal machine operating rate was within the range of 90 to 95%. In terms of economy, this means that productivity has improved by about 20% over the conventional method.

In terms of safety, since the dice are supported by the dice support plate 4, there is no danger of them falling. In addition, when using the one-sided cap screw type, I suffered from back pain due to the awkward posture when changing dies, but with the slide type, this problem disappeared.

In addition, with the one-sided cap screw type, there was a risk of burns when the die was exchanged, but by using the sliding type, there was no risk of burns.

As a result of the economic efficiency and safety described above, productivity has improved and it is now possible to handle high-mix, low-volume production, and safety has also improved, making short delivery times smoother and industrially useful. effective.

[Brief explanation of drawings]

1 to 3 are perspective views, front views, and side views of the left-right sliding device for dice of the present invention, and FIGS. 4 to 6 are perspective views and front views of the vertical sliding device for dice of the present invention. , and side view, Fig. 7 (1), (II), (
fir) is an explanatory diagram showing how the left and right slides of the die are exchanged, Figure 8 CI), (n), and (III) are explanatory diagrams showing how the vertical slides of the die are exchanged, and Figure 9 is an explanatory diagram showing how the vertical slides of the die are exchanged. The schematic sectional view, FIG. 10 and FIG. 11 are a front view and a side view of the cap screw type die. 1...Head 2...Dice 2A...
Dice to be used next time 3...Slide groove 4...Support plate for die replacement 4A...Slide groove of support plate 5...Hydraulic cylinder 6...Die holding screw 8...Feed part 9...・Kneading cylinder part 10...Cap screw 7...Die hole Fig. 4 Fig. 5 Fig. 6vlJ Fig. 1 Fig. 2 Fig. 3 Fig. 7 (Z) Fig. 9 Fig. 10 Fig. 11

Claims (1)

[Claims] 1. In a rubber extrusion mold, a plurality of hydraulic cylinders are equipped at both ends of the die for the rubber extrusion mold, and the die is equipped with a plurality of hydraulic cylinders on either the left or right side or
A slide-type die changing device characterized in that the die is switched by sliding the die up and down. 2. The hydraulic pressure of the hydraulic cylinder when exchanging dies using the sliding type is as follows: P_C=P_M×d×R However, P_C: Hydraulic cylinder pressure (Kg/cm^2) P_M:
2. The slide-type exchanging device for dies according to claim 1, wherein head pressure during extrusion (Kg/cm^2) d: extruder cylinder inner diameter (cm) R: range expressed by a constant of 1 to 1.5. 3. The sliding die changing device according to claim 1, wherein dies having 2 to 5 molding ports per die in a rubber extrusion mold are simultaneously switched.