JP3351978B2 - Molding equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] The present invention relates to a molding apparatus for manufacturing a ring. In particular, the molded product is moved to the next step together with one of the divided dies so that the molded product adheres to one of the divided dies, and the molded product aligned with the burrs is divided at one time from the burrs. The present invention relates to a molding apparatus that performs the following.

[0002]

2. Description of the Related Art As a prior art relating to a molding apparatus of the present invention, there is a molding machine shown in FIG.

[0005] In FIG. 12, reference numeral 61 denotes a nozzle provided on the tip end side of an injection molding machine 60. A molding material is injected from a nozzle 61 provided at the tip of the injection mechanism of the injection molding machine 60 into a molding section 74 of a molding die 70 to be molded.

[0004] A forming portion 74 of a forming die 70 has a sprue hole (passage) 75 communicating with the nozzle 61 and a sprue hole 7.
5, a disc-shaped runner passage 76 communicating with the runner passage 5, a narrowed gate passage 77 communicating with the runner passage 76, and a molding cavity 78 communicating with the gate passage 77 and molding the molded product A. . A burr groove 79 is formed on the outer periphery of the molding cavity 78.

[0005] The molded product F formed by the above-described molding die 70
Forms the sprue portion B with the sprue hole 75 and the runner portion C with the runner passage 76 in FIG.
Further, the divided portion D is formed in the gate passage 77, and the outer burr portion Eb is formed in the burr groove 79 on the outer periphery of the molded product A.

The upper mold 7 which is a split mold of the mold 70 is used.
1 and the lower mold 72 are opened to take out the molded product F, and in the next step, the inner burr portion Ea and the outer burr portion Eb connected to the molded product A are cut to obtain a product of only the molded product A It is assumed that.

However, when the upper mold 71 and the lower mold 72 are divided and opened, the molded product F adheres to the upper mold 71,
There is a problem that the burr is not fixed or is not fixed to the lower mold 72, which makes the burr cutting operation difficult.

Further, FIG. 13 shows the molded article F
FIG. 4 is a cross-sectional view showing a burr cutting machine 62 that cuts only burrs on a lower mold 72.

This molded product F is difficult to cut with a cutting tool such as a cutting punch because the outer outer burr portion Eb is formed to be thin or partially missing.

For this reason, as shown in FIG. 13, a laser 64 is irradiated from a laser head 63 to cut the outer divided portion D. However, the cutting by the laser 64 takes time for setup and the like, thereby deteriorating productivity.

Further, there is a danger to the human body due to the laser 64 for the operator. Further, the molding surface of the lower mold 72 is damaged by the laser 64, and a defective product is generated in the subsequent molded product A.

Further, as another prior art, there is a molding die 80 of a compression molding machine shown in FIG.

FIG. 14 is a plan view of a molding surface of the divided lower mold 82 of the molding die 80.

In FIG. 14, eight second molding surfaces 83b are formed on a joint surface 86 of the lower die 82 with the upper die 81. A plurality of burr grooves 84 are formed so as to surround four sides of the second molding surface 83b. Further, a number of burr grooves 84 are formed around the entire molding surfaces 83b of the lower die 82. This burr groove 84 corresponds to the burr groove 84 shown in FIG.
They are communicated by a gap 85 between them.

Similarly to the lower die 82, the upper die 81 has a first molding surface 83a and a burr groove 84 formed at corresponding positions.

FIG. 15 is a cross-sectional view of the lower mold 82 and the upper mold 81 (not shown) shown in FIG.

In FIG. 15, a sheet-like rubber material 88 (see also FIG. 14) is arranged between an upper die 81 and a lower die 82, and the molding die 80 is compressed by a conventional compression molding machine 87. Molding. At this time, the rubber material 88 is
It protrudes and flows out between the burr grooves 84 one after another. This is because unless the rubber material 88 is excessively arranged so as to protrude between the burr grooves 84, the rubber material shortage causes a failure in the molded product A. For this reason, a gap 85 for the purpose of flowing the rubber material 88 is positively formed between the burr grooves 84. The width I of the gap 85 can be approached only slightly smaller than the width J of the burr groove 84. Otherwise, the pressure in the molding cavity 89 decreases.

The molded product F formed by the compression molding machine 87
In this case, the burrs E are formed on the inner and outer peripheral sides of the molded article A, and the yield of the rubber cloth 88 with respect to the molded article A is extremely low. In particular, since silicon rubber, fluorine rubber and the like have a high material value, there is a problem that this yield cannot be left.

Further, the burrs E formed by the compression molding machine 87 must be removed. FIG. 16 is a cross-sectional view of a main part showing a burr finisher 90 for finishing the molded product A.

FIG. 17 shows an enlarged portion of a molded product F formed by the compression molding machine 87 described above. This figure 1
At 7, the points A ₁ and B ₁ are cut by the punch 95.

When the molded product F is opened, it is not fixed to which of the divided dies it adheres. Therefore, the molded product F
Is removed from the mold 80 and the supporting plate 9 of the burr finishing machine 90 is removed.
1 and the holding plate 93 must be set. Then, the inner burr portion Ea of the molded product A is cut by the cooperation of the punch 95 that reciprocates into the deburring hole 94 of the die 92. Next, the support plate 91 moves, and the next molding F
And inner A ₁ point and B ₁ point of the molded article A for is to be set to the cutting edge of the punch 95. Thus, the inner burr portions Ea on the inner peripheral side of the eight molded products A are sequentially cut.

Next, the outer burr portion Eb outside the molded product A is cut by a punch and a die by another burr finishing machine. Therefore, the divided cutting of the molded product A, the inner burr portion Ea, and the outer burr portion Eb is performed by separating the molded product F from the molding die 80 and setting it on the burr finisher 90, and by setting a large number of burr portions Ea, E
It is extremely difficult to cut the point b.

[0023]

As described above, in the steps from the molding to the finishing of the injection molding machine 60, it is extremely difficult to perform multi-cavity molding by one molding. Furthermore, when trying to perform multi-cavity molding, poor flow is caused in terms of the flow of the molding material.

Further, there is a problem that even if the laser head 63 is used for burr finishing, the burr finishing speed is low and the shape of the outer burr portion Eb cannot be easily formed.

Further, even when the molding is performed by the compression molding machine 87, the burr E is large and the yield is extremely deteriorated. Furthermore, since the burrs E are formed on the inner and outer peripheral sides of the molded product A, it is extremely difficult to finish the burrs. When the burrs E are finished, defective cutting may occur frequently.

The present invention has been made in view of the above-described problems, and has the following technical problems. That is,

One object of the present invention is to make it possible to take a large number of pieces in one molding.

Another object of the present invention is to improve the yield by minimizing the formed burr portion and to simplify the burr finish.

Further, a third object of the present invention is to obtain a molding apparatus which improves the efficiency of production by burr-finishing a molded article at a time.

[0030]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the technical means thereof is configured as follows. That is,

A molding machine for molding using a single-piece molding die, and a movement for opening the first split mold on the side into which the molding material is injected after molding by the molding machine, and moving the mold to a molded product receiver. Means, a molded product release device for releasing the molded product adhered to the first split mold and setting the molded product in a molded product receiver;
In a molding apparatus for ring molding having a split finisher for separating a molded product of a molded product receiver into a molded product and burrs, a first split mold has an inflow port which can be joined to a nozzle for injecting a molding material. A first sprue forming surface of a sprue passage having a conical gap formed from the inflow port, a first split portion forming surface of a gate passage narrowing an outflow port downstream of the sprue passage, and a molding communicating with the gate passage. One of the cavities has a molding cavity forming surface, and one of the sprue molding surfaces has a recess formed therein.

[0032]

In the molding apparatus P of the present invention, a molded product F is molded by a molding machine Q, and a concave portion 4c is provided so that the molded product F adheres to one split mold 2 of the molded mold 1. So
All the moldings F are attached to one of the split molds 2 by engaging with the concave portions 4c. One of the divided molds 2 to which the molded product F adheres is moved onto the molded product receiver S, which is the next step, and the molded product F is removed from the divided mold 2 by the molded product release device R from the one divided mold 2. Move to the same arrangement state. Then, the molded product F transferred to the molded product receiver S is cut and finished into a molded product A and a burr E at one time by the split finishing machine T.

[0033]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A molding apparatus according to an embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a front view of a molding apparatus for molding a rubber ring according to an embodiment of the present invention.

In FIG. 1, P is a molding device for molding a rubber ring. The molding machine P is provided with a molding machine Q. The molding machine Q is provided with a molding die 1 having a pair of an upper die 2 and a lower die 3. Also,
In front of the molding die 1 of the molding machine Q, a molded product releasing device R for releasing the molded product F molded from the upper die 2 is provided. Below the molded product release device R, a molded product receiver S that receives the molded product F in cooperation with the molded product release device R is disposed.

The molded product receiving device S of the molded product release device R
Is configured to be able to automatically reciprocate on the rail from the illustrated state to the right side by the moving means V using a hydraulic cylinder. Further, a split finishing machine T that divides the molded product F into a molded product A and a burr E is disposed at the right moving end of the molded product receiver S. Then, the molded product F is cut into a molded product A and a burr E in cooperation with the molded product receiver S by the finishing machine T and finished.

FIG. 2 is a conceptual diagram showing, as an enlarged sectional view, a machine in each step of the molding apparatus P shown in FIG.

FIG. 2A is an enlarged sectional view of the molding machine Q shown in FIG. In FIG. 2A, reference numeral 1 denotes a molding die. The molding die 1 is a split die, in which an upper die 2 and a lower die 3 are attached to mold frames 30 and 30, respectively, and are arranged between an upper hot plate 31 and a lower hot plate 32. These molds 30, 30
Rollers 33 are mounted on both sides.
3 is guided by the hydraulic cylinder 21 so as to be able to be taken out forward while being guided by a pair of rails 34 attached to the molding machine Q.

The molding material A is supplied to the pot 24 of the molding machine Q. The molding material A is injected into the molding cavity 7 at the injection section 23 and the molding F (the molding A And burrs E). Next, the ram 35 of the molding machine Q descends to open the upper mold 2 and the lower mold 3.

FIG. 2B is a front view in which the upper mold 2 attached to the mold frame 30 is arranged on the rail 34. The above opened upper mold 2 moves forward along the rail 34 by the operation of the hydraulic cylinder 21 together with the mold 30,
Stops on the molded article receiver S. The moving means V moves the molding die 1 to the molded product receiver S using the rail 34, the hydraulic cylinder 21, and the mold frame 30.

FIG. 2C is a conceptual diagram showing a cross section of the molded product releasing device R.

In FIG. 2 (C), when the molded article receiver S below the upper mold 2 is moved upward by the operation of the hydraulic cylinder lifting device R ₁ and joined to the upper mold 2, release device R is actuated pusher R ₂ replacing the molded product F adhering to the upper die in the same sequence state to the molding receiving device S. FIG. 2 is a state diagram after the replacement.

FIG. 2D is a conceptual view showing the rail 36 of the _second moving means V2 for moving the molded product receiver S from the molded product release device R to the divided finishing machine T.

In FIG. 2D, the rail 36 is
It is disposed so as to be orthogonal to the right direction with respect to the rail 34 of (B). Then, the molded product receiver S is configured to be movable below the split finishing machine T.

FIG. 2E is a conceptual diagram showing a sectional finisher T as a cross section.

In FIG. 2E, the molded article receiver S is
FIG. 7 is a diagram illustrating a state where the _second finishing unit is moved below the divided finishing machine T by a _second moving unit V2. Then, divide separating a molded product F of the cutting machine T ₁ of the division finisher T is held in the molded product receiving device S operating downward and molded article A and burrs E. The cutting of the molded product F is performed while the molded product A is held in the molded product receiver S.
Only the burr E is dropped from the molded article receiver S to the burr receiving box U and accommodated therein.

FIG. 3 is an enlarged sectional view of the molding machine Q in FIG.

In FIG. 3, an upper mold 2 and a lower mold 3 of a molding die 1 are shown.
In the state where the roller 33 is attached to the formwork 30, the roller 33 of the formwork 30 is positioned and held on the rail. And when the ram 35 descends after molding, it opens the mold,
The upper die 2 is moved to the front of the molding machine Q via a moving means V by a hydraulic cylinder (not shown) located rearward in the figure.

FIG. 4 is a front view showing the molded product releasing device R.

In FIG. 4, as described above, the upper mold 2
It is moved from the state shown in FIG. Then, the molded product release device R is operated to descend and move the molded product F of the upper mold 2 to the molded product receiver S in the same arrangement state.

As described above, the molded product F can be accurately moved from the upper mold 2 to the molded product receiver S in the same arrangement because the concave portion 4c is provided on the sprue molding surface 4a of the upper mold 2 of the molding die 1. This is because the convex portion Ba of the molded product F adheres to the concave portion 4c, and the sprue portion B is formed in an annular conical shape.

FIG. 5 is a plan view of the molding die 1 as viewed from the nozzle side.

In FIG. 5, a molding die 1 is composed of an upper die 2 and a lower die 3. The upper die 2 has 25 sprue passages (holes) 4 at positions corresponding to the nozzles 22 in FIG.
Are provided. The number of sprue passages 4 can be increased to 28, 32, or 36 in accordance with the individual production of the molded product. Reference numeral 8 is a communication passage.

FIG. 6 is a sectional view taken along the line AA of FIG.
In FIG. 6, the sprue passage 4 has a conical annular interval, and an annular runner passage 5 in a horizontal direction communicates with the bottom of the sprue passage 4. Furthermore, it communicates with the inner peripheral surface side of the molding cavity 7 having a circular cross section from the runner passage 5 via the gate passage 6.

Further, two communication passages 8 are provided on both sides of the molding cavity 7 of the molding die 1.
Can communicate with a vacuum passage of a molding machine Q (not shown). Outside the lower die 3, a groove 10 for mounting an O-ring 9 surrounding the molding cavity 7 is formed. This O-ring 9 is used when molding the molding material A.
When the air or the like contained in the molding material A in the molding cavity 7 is evacuated through the vacuum passage, it is sealed to the outside.

FIG. 7 is a sectional view taken along the line BB of FIG.
In FIG. 7, a bush 12 provided with a guide hole 11 having a conical surface is fitted to the upper mold 2. Also, this bush 1
A knock pin 13 that fits into the second guide hole 11 is provided on the lower mold 3. Then, the upper die 2 and the lower die 3 are positioned and assembled by the bush 12 and the knock pin 13.

FIG. 8 is an enlarged sectional view taken on line C- of FIG. In FIG. 8, a conical sprue forming surface 4 a provided with an inflow port 4 b capable of communicating with the nozzle 22 is formed in the upper die 2. Inflow port 4b of this sprue forming surface 4a
On the side, a concave portion 4c is formed for bonding the formed sprue portion B. The recess 4c is formed in an inverted frustoconical shape so that the upper portion has a slightly larger diameter.

Below the sprue molding surface 4a, a horizontal runner-shaped first runner molding surface 5a is formed. The entrance of the molding cavity 7 is formed on a first divided portion molding surface 6a for molding the divided portion D to a thickness of about a film.

The molding cavity 7 is formed in a conical cross section for molding an O-ring, but other rings can be molded according to the shape.

The lower mold 3 is provided with a sprue forming surface 4 of the upper mold 2.
A sprue core 4d is formed which has a conical surface 4e (see FIG. 10) opposed to the gap a in FIG. Further, the base of the sprue core 4d has a second
A runner molding surface 5b is formed. The entrance of the molding cavity 7 is formed on the second divided portion molding surface 6b. The molding part 15 is formed by the molding surfaces on which the sprue part B, the runner part C, the division part D, and the molded product A are molded.

Then, the molding material flows into the inflow port 4b from the nozzle 22 shown in FIG. 5, and the molding section 15 forms the shape as shown in FIG. At this time, the sprue portion B
The protrusion Ba is bonded to the upper mold 2 by bonding to the recess 4c, and the sprue portion B is formed to be thin to improve the yield. Next, the runner portion C is formed to be thicker than the sprue portion B, and this thick portion also functions to make the sprue portion B and the divided portion D thinner. Since the sprue portion B is formed in an annular conical shape, the molded product F also functions to adhere to the upper die 2. That is, even if the sprue forming surface 4a has a conical surface, the formed product F has a function of attaching to the upper mold 2.

The molding material is molded in the molding cavity 7. In this embodiment, the O-ring is formed to have a circular cross section in order to form the O-ring. For example, there are a square ring, an X ring, a packing and the like.

The divided portion D formed by the gate passage 6 is formed in a thin film shape. Further, the length in the radial direction with respect to the center line is formed to be short. When the division D is cut by the cutting punch, the molded product A and the runner C can be easily divided, and the division surface can be finished with high precision.

FIG. 9 is a cross-sectional view of the upper die 2 of the molding portion 15 according to another embodiment of the present invention. The inclination angle θ of the sprue forming surface 4a is larger than that shown in FIG. This inclination angle θ is applied in a range of 45 ° to 89 °. In addition, when the angle θ of the sprue molding surface 4a is larger, the molded product A can be uniformly adhered to the upper mold 2 when the mold is opened.

FIG. 10 is a cross-sectional view of the lower mold of FIG. In FIG. 10, the sprue core 4d
Is formed separately from the lower mold 3. In this case, the sprue core 4 d can be made of a material different from the material of the lower mold 3. For example, the lower mold 3 is made of SK material, and the sprue core 4d is made of stainless steel.
The plating of the sprue core 4d can be omitted. If the sprue core 4d is made of stainless steel to eliminate the plating process, it is possible to prevent molding defects due to peeling of the plating.

FIG. 11 shows the upper mold 2 of FIG. 9 and the lower mold 3 of FIG.
And FIG. In this case, FIG.
Can be made thinner than the thickness of the runner part C. Further, the thickness of the divided portion D formed by the gate passage 6 can be reduced. The runner portion C is formed thick to facilitate separation of the molded product A and the sprue portion B side.

The concave portion 4c formed on the sprue forming surface 4a may be formed in a semicircular concave shape or a triangular concave portion. Further, it can be formed as two lines along the sprue forming surface 4a. Then, the molded product F can be bonded to the upper mold 2 without fail.

Also, the inclination angle θ of the sprue forming surface 4a,
By changing the inclination angle θ of the conical surface 4e of the sprue core 4d, the gap size of the sprue hole 4 can be made different between the inflow port 4b and the lower outflow side. Accordingly, the molding speed can be increased, and the molded product F can be attached to the upper mold by adjusting the thickness of each part. Furthermore, a molding material having a high vulcanization rate, or
In the case of a highly viscous molding material, it is preferable to make the gap on the outlet side larger than the inlet 4b side.

On the other hand, when it is desired to increase the vulcanization rate (to shorten the molding cycle), it is preferable to reduce the size of the gap below the sprue hole 4 on the outflow side. In particular, when the gap size is gradually reduced toward the lower side of the conical sprue hole 4, vulcanization can be promoted, and the generation of burrs outside the molding cavity can be effectively prevented.

[0070]

According to the molding apparatus of the present invention, a concave portion is provided on one of the sprue forming surfaces of the sprue passage, and the sprue portion is formed in an annular conical shape. Can be attached to one of the sprue forming surfaces. Since it can be attached to this one sprue molding surface, if the split mold having this one sprue molding surface is moved to the next step and moved to the molded product receiver in the same arrangement, molding is performed using the molded product receiver. It is possible to divide and finish all the molded products and burrs at one time.

By providing a concave portion on the sprue molding surface, the molding material flowing into the annular conical sprue passage can be further changed together with the conical sprue passage in the flow of the molding material, and vulcanization can be promoted. The molding speed can be increased.

Further, since the sprue passage has an annular and conical shape, it can be directly injected into each molding cavity from a large number of nozzles. It can be expected to prevent the generation of external burrs outside the molding cavity. or,
By making the sprue passage conical, the ratio of burrs to the molded product can be reduced and the yield is improved (40 to 5).
0%).

[Brief description of the drawings]

FIG. 1 is a front view of a molding apparatus according to an embodiment of the present invention.

FIG. 2 is a conceptual diagram of each machine of the molding apparatus shown in FIG. 1 of the present invention.

FIG. 3 is a right half sectional view of the molding machine shown in FIG. 1;

FIG. 4 is a front view of a main part of a molding machine related to the molded product release device shown in FIG. 1;

FIG. 5 is a plan view of a molding die showing one embodiment according to the present invention.

FIG. 6 is a cross-sectional view of the mold of FIG.

FIG. 7 is a cross-sectional view of the molding die of FIG.

8 is a cross-sectional view of the molding die of FIG.

FIG. 9 is a cross-sectional view showing a molded part of an upper mold according to another embodiment of the present invention.

FIG. 10 is a cross-sectional view showing a molded portion of a lower mold according to another embodiment of the present invention.

FIG. 11 is a cross-sectional view showing a molded part where the upper mold and the lower mold of FIGS. 9 and 10 are combined.

FIG. 12 is a side view of a conventional nozzle and a cross-sectional view of a molding die.

FIG. 13 is a front view of a conventional burr cutting machine.

FIG. 14 is a plan view of a molding surface of a conventional molding die.

FIG. 15 is a cross-sectional view of a mold showing a part of FIG.

FIG. 16 is a sectional view of a conventional split finishing machine.

FIG. 17 is a cross-sectional view showing a molded article which is the molded article shown in FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Mold 2 ... Upper mold 3 ... Lower mold 4 ... Sprue passage (hole) 4a ... Sprue molding surface 4b ... Inflow port 4c ... Recess 4d ... Core for sprue 4e ... Conical shape Surface 5 Runner passage 5a First runner molding surface 5b Second runner molding surface 6 Gate passage 6a First division molding surface 6b Second division molding surface 7 Mold cavity 7a: Forming cavity forming surface 8: Communication path 9: O-ring 10: Groove 11: Guide hole 12: Bush 13: Knock pin 15: Forming part 16: Plating P: Forming device Q: ... Molding machine 21 ... Hydraulic cylinder 22 ... Nozzle 23 ... Injection unit 24 ... Pot 30 ... Form frame 31 ... Upper heat plate 32 ... Lower heat plate 33 ... Roller 34 ... Rail 35 ... Ram 36 ... Rail R ... Mold release device ₁ ...... lifting device R ₂ ...... pusher S ...... moldings receiving unit T ...... divided finisher T ₁ ...... cutter U ...... burr receiving boxes V ...... moving means 60 ...... injection molding machine 61 ... … Nozzle 62… Burr cutting machine 63… Laser head 64… Laser 65… Support plate 66… Die 67… Punch 68… Pressing plate 70… Molding die 71 …… Upper die 72 …… Lower die 73 molding cavity 74 molding part 75 sprue passage (hole) 76 runner passage 77 gate passage 78 molding cavity 79 burr groove 80 molding die 81 upper die 82 … Lower die 83… Molding surface 83a… First molding surface 83b… Second molding surface 84… Burr groove 85… Gap 86… Joining surface 87… Compression molding machine 88… Rubber cloth 89… Mold cavity 90: Burr finisher 91: Support 92: die 93: holding plate 94: deburring hole 95: punch A: molded product B: sprue portion Ba: convex portion C: runner portion D: split portion E: flash Ea ... Inner burr portion Eb... Outer burr portion F... Molded product V... Moving means V ₂ .

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) B29C 37/00-37/04 B29C 45/00-45/84 B29C 33/00-33/76

Claims (1)

(57) [Claims] 1. A molding machine (Q) for molding using a single-piece molding die (1), and a first split mold on a side to which molding material is injected after molding by the molding machine (Q). 2) moving means (V) for opening the mold and moving it to the molded article receiver (S);
A molded product release device (R) for releasing the molded product (F) adhering to the first split mold (2) and setting the molded product (F) on the molded product receiver (S); In a molding apparatus for ring molding having a split finishing machine (T) for separating the molded product (F) of S) into a molded product (A) and a burr (E), the first split mold (1) is formed by molding. Having an inlet (4b) that can be joined to a nozzle (22) for injecting material,
One sprue forming surface (4a) of a sprue passage (4) having a conical gap formed from the inlet (4b);
One of the first divided portion forming surface (6a) of the gate passage (6) narrowing the outlet downstream of the sprue passage (4) and one of the forming cavity (7) communicating with the gate passage (6). A molding device having a cavity forming surface (7a) and a concave portion (4c) formed in said one sprue forming surface (4a).