JPH0217843Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a gas burner cap used in kitchen appliances such as gas ranges and gas tables.
This invention relates to a molding die for press-molding a burner cap, which covers an opening formed on the upper surface of a burner body and forms a flame port between it and the burner body, from a ceramic material.

(Prior art) Conventionally, gas burners used in gas ranges, gas stoves, etc. are made of cast iron or other metals, but metal materials have limited heat resistance and are easily corroded by adhesion of boiling liquid, etc. Therefore, the durability was low.

Therefore, it is conceivable to make the gas burner made of ceramic, which has excellent heat resistance and corrosion resistance.

In this case, the burner cap is of course also made of ceramic, but press molding is suitable for its molding in view of the simplicity of the equipment and good workability.

On the other hand, it is possible to use ceramic materials in the form of powder, granules, aggregates, and kneaded clay for press molding, but the former three do not have uniform density in the molded material when press molded, and some This is not preferable because it causes uneven density and causes distortion when fired.

Therefore, press molding is performed using clay-like ceramic material, but in this case most of the distortion occurs during demolding.

In other words, the molded base material press-molded using clay-like ceramic material is not only soft and easily deformed, but also easily adheres to the mold, and when the upper mold is lifted to open the mold, it partially adheres to the upper mold. Distortion may occur due to being lifted diagonally.

In conventional press molding of ceramic materials, the upper mold is fixed as one piece even if it is made up of multiple members, and the entire mold is pulled up from the lower mold at once and peeled off from the molding base at once. Because of this structure, the molded base material is easily lifted from the lower mold when the mold is opened.

In addition, if the burner cap becomes distorted, it may become inconvenient to attach it to the burner body.
The size of the flame opening may become uneven, making it impossible to obtain a uniform flame, or there may be a gap in the fitting part with the burner body, from which gas may leak, causing flames to appear in areas other than the flame opening, resulting in poor performance. Moreover, there is a risk of serious safety defects.

(Problem to be solved by the invention) The problem to be solved by the invention is that in a mold for press-molding a ceramic material to form a burner cap, the upper mold is partially removed from the molding base when the mold is opened. The purpose is to make it possible to peel it off little by little.

(Means for solving the problem) The technical means taken by the present invention to solve the above problem consists of a pair of upper and lower molding molds, and the upper mold is divided into a plurality of parts that fit together in a telescopic manner. formed by
These parts are slidably fitted in order of size, and the innermost part is connected to the press machine, and the sliding surfaces of the adjacent parts are fitted with a gap on the upper or lower side. When the inner portion moves upward by a predetermined distance, a concave portion and a convex portion are formed which abut and engage with each other and transmit the movement of the inner portion to the adjacent outer portion.

(Function) According to the above technical means of the present invention, when the mold is opened, the upper mold is partially pulled up from the inner part and peeled off from the substrate, and when the inner part is pulled up, the outer part of the upper mold is pulled up. In some areas, the material is pressed down.

(Example) Hereinafter, an example of implementation of the present invention will be described based on the drawings.

This embodiment has a shape as shown in FIGS. 6 and 7, that is, it has a cylindrical boss part 7 in the center for fitting into the burner body B, and an annular shape that extends outward continuously from the upper end of the boss part 7. An annular projecting edge 9 is formed on the upper surface of the outer peripheral edge of the inclined surface portion 8, and a large number of tooth-like protrusions 10 are formed on the lower surface thereof to protrude radially along the inner circumference of the annular projecting edge 9. A burner cap C having a shape with an auxiliary flame opening 11 provided inside the row is press-molded, and the mold A is composed of a pair of upper and lower molds A ₁ and A ₂ .

The lower mold A ₂ is in charge of molding the back side of the burner cap C, and includes a molding recess 12 for the boss part that molds the outer peripheral surface of the boss part 7 of the burner cap C, and a molding recess 12 for the boss part continuous with the periphery of the molding recess 12 for the boss part. The annular inclined surface forming recess 13 forms the back surface of the annular inclined surface portion 8 of the burner cap C, and the annular inclined surface forming recess 13 has a tooth-shaped unevenness for forming the tooth-like protrusion 10 of the burner cap C. 14 is provided in an annular shape.

The upper mold _A1 is in charge of molding the surface side of the burner cap C, and is used for molding the inner peripheral surface of _the boss part 7 of the burner cap C in correspondence with the molding recess 12 for the boss part of the lower mold A2. Molding convex part 15, lower mold A ₂
The annular inclined surface forming part 16 and the annular flange forming part 17 for forming the annular inclined surface part 8 of the burner cap C correspond to the annular inclined surface forming recess 13 of the burner cap C. is pin 1 for opening the auxiliary flame port 11 of burner cap C.
8 is drilled.

In addition, the upper mold A ₁ is formed into three parts a, b, and c that fit together in a telescoping manner, and these three parts a, b, and c are slidably fitted together in the order of size. The boss portion molding convex portion 15 is formed on the innermost side, that is, the central portion a of the upper mold A ₁ , and the annular inclined surface molding portion is formed on the intermediate portion b of the upper mold A ₁ that fits on the outside thereof. 16 is also the outermost part,
The molded portions 7 for the annular protrusion are formed at the respective portions c.

Annular recesses 3 and 4 are formed along the circumferential direction on both the inner and outer circumferential surfaces of the intermediate portion b of the upper mold _A1 , and
Convex portions 5 and 6 that fit into and engage with the recesses 3 and 4 are formed on the outer circumferential surface of the center portion a and the inner circumferential surface of the outer portion c.

Convex portions 5 on the outer periphery of the center portion a and the inner periphery of the outer portion c;
The vertical width of 6 is formed to be smaller than the vertical width of the recesses 3 and 4 on the inner and outer peripheries of the middle part b, so that the corresponding recesses 3 and 4 and the protrusions 5 and 6 fit loosely, and each part a , b, c forming parts 15, 16,
17 are normally continuous, the lower surface of the convex portion 5 on the outer periphery of the center portion a is in contact with the lower surface of the recess 3 on the inner periphery of the intermediate portion b, with a gap 1 above, and the upper surface of the convex portion 6 on the inner periphery of the outer portion c is The intermediate portion b is formed so as to come into contact with the upper surface of the recess 4 on the outer periphery and have a gap 2 below.

The upper mold A ₁ is connected to a press machine (not shown) at the center part a, and the lower mold A ₁ is connected to a press machine (not shown) at the center part a, and
A ₂ placed above.

Reference numeral 19 is a guide shaft that guides the raising and lowering of the upper mold _A1 .
The guide hole 20 is vertically erected on the periphery of the lower mold A ₂ and is slidably inserted into a guide hole 20 bored in the periphery of the outer portion c of the upper mold A ₁ .

Therefore, such molding die A is molded in the molding recess 1 of the lower mold _A2 .
Place clay-like ceramic material on top of 2 and 13,
By lowering the upper mold _A1 , clamping the mold, and pressurizing it with a press, the burner cap C shown in Figs. 6 and 7 is formed.
It is possible to obtain a molded base, but the operation when opening the mold is unique.

That is, when the upper mold A ₁ is raised and opened after mold clamping, only the center portion a of the upper mold A ₁ is first lifted by the press machine and raised, as shown in FIG. move away from At this time, the intermediate portion b and the outer portion c of the upper mold A ₁ have not yet risen and are firmly pressing the molding base A, so that the molding base A is not distorted due to the release of the central portion a.

Next, as shown in FIG. 4, when the center portion a rises by a predetermined distance, that is, one gap, and the upper surface of the convex portion 5 abuts and engages the upper surface of the recess 3 on the inner periphery of the intermediate portion b, the center portion a rises. As a result, the intermediate portion b is pulled up and begins to rise, leaving the molding base a. At this time, the outer portion c of the upper mold A ₁ has not yet risen and is holding down the molding material I, so that the molding material I is not distorted due to the release of the intermediate portion b.

Subsequently, the center portion a and the intermediate portion b continue to rise, and when the lower surface of the recess 4 on the outer periphery of the intermediate portion b comes into contact with the lower surface of the convex portion 6 of the outer portion c, the outer portion c becomes the intermediate portion b.
It is pulled up by the molding material A and rises and leaves the molded base material A. At this time, there is no longer a part holding down the molded base material A, but the outer part c only molds the annular protruding edge 9 of the burner cap C, and the area in contact with the molded base material A is small, so the distance between the two parts is small. There is little risk that the molded material will be pulled up by the mold and distorted.

(Effects) Since the present invention is configured as described above, when the mold is opened, the upper mold can be lifted up little by little from the inner part and released from the mold. Therefore, the molded material is less likely to adhere to the upper mold and be lifted up due to the upper mold rising. Moreover, when the inner part is pulled up, the outer part is holding down the base material, so lifting of the molded base material is more reliably prevented.

Therefore, it is possible to prevent distortion caused by the molded base being lifted or displaced when the mold is opened.

[Brief explanation of drawings]

FIG. 1 is a plan view, partially cut away, of a press molding die for a ceramic burner cap showing one embodiment of the present invention. FIGS. 2 to 5 are cross-sectional views taken along the line X--X in FIG. 1, and explain the state of the mold opening according to the process. FIG. 6 is a front view showing an example of a ceramic burner cap molded by the mold, and FIG. 7 is a sectional view showing the burner cap set in the burner body. A: Molding mold, A ₁ : Upper mold, A ₂ : Lower mold, a, b,
c: part of the upper mold that fits into the nesting type, 1, 2: void, 3, 4: recessed part, 5, 6: convex part.

Claims (1)

[Scope of utility model registration request] It consists of a pair of upper and lower molding molds, and the upper mold is formed by dividing it into multiple parts that fit together in a telescoping manner.The parts are slidably fitted together in order of size, and the innermost part is placed in a press machine. The adjacent parts are fitted with each other with a gap above or below the sliding surfaces of each other, and when the inner part moves upward a predetermined distance, they abut and engage with each other and the inner part A mold for a ceramic burner cap that has concave and convex parts that transmit the movement of one part to the adjacent outer part.