JPH09234543A - Method and device for marking mold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To place a mark used to cast the necessary information on a casting on a cavity surface of a mold with excellent productivity. SOLUTION: A hole-shaped mark is formed at a prescribed position of a cavity surface 2a of a mold 2 to cast the necessary information on a casting so that the necessary information can be read by the position of the mark placed on the cavity surface 2. Because a simple hole-shaped mark is formed on the cavity surface 2a, the mark can be formed by the plastic deformation or the cutting with excellent productivity while the loss of shape is prevented even if the mold 2 is made of sand or gypsum. Because the necessary information is read by the position of the hole-shaped mark formed on the cavity surface 2, this method can be easily applied to a case in which a large number of different information is indicated on the casting by appropriately determining the reading method corresponding to the mark position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold marking method and apparatus for marking a cavity surface of a mold in accordance with the necessary information for the purpose of casting necessary information into a casting.

[0002]

2. Description of the Related Art Conventionally, in the production of castings, in order to control the castings to be mass-produced, concave characters have been previously formed on the cavity surface of the mold, and these concave characters are cast into the casting to obtain the name. Indications and indications of information necessary for casting production management are added to castings. And
The formation of a concave character on the cavity surface of a mold is performed by an operator incorporating a detachable inverted convex character into a model for molding a mold and transferring the inverted convex character to the mold.

[0003]

However, the work of incorporating the detachable reversible convex character into the model in such a manner is troublesome, and it is necessary to stop the flow of the mold forming line, thereby reducing the productivity. It will be a major factor to hurt. Especially in recent years,
With the enforcement of the Product Liability Act, the information necessary for casting production management has increased, and it has become necessary to add different information to each individual casting, so every single step of molding one mold The current method of attaching and detaching inverted convex characters to and from is extremely inefficient.

The present invention has been made in view of the above circumstances, and a method and a method for adding a mark to a mold for producing necessary information on a casting with good productivity with respect to the mold cavity surface. It is a technical problem to be solved to provide a device.

[0005]

A method of marking a mold according to the first aspect of the present invention, which solves the above-mentioned problems, is a method for marking required information on a casting according to the necessary information on the cavity surface of the casting. And a hole-shaped mark is formed at a predetermined position on the cavity surface so that the necessary information can be read according to the position of the mark added to the cavity surface.

[0006] Since this method forms a simple hole-shaped mark on the cavity surface of the mold, when it is applied to a mold made of sand or gypsum (hereinafter appropriately referred to as sand mold or gypsum mold), the mold (sand mold or gypsum mold) is used. It is possible to form marks by plastic deformation processing or cutting processing with good productivity while preventing the mold from collapsing. In particular, a sand mold made of raw sand is molded by compression molding a mixture of raw sand and a binder,
Although it is hard and brittle immediately after molding, the method of the first aspect of the present invention for forming a simple hole-shaped mark can effectively prevent shape collapse when forming the mark. A sand mold made of shell sand is molded by thermosetting the binder in a mold by mixing a mixture of shell sand and a binder, which is hard and brittle immediately after molding, but has a simple hole shape. According to the method of the first aspect of the present invention for forming the mark, it is possible to effectively prevent the shape collapse when forming the mark. Since this method is designed so that necessary information is read according to the position of the hole-shaped mark formed on the cavity surface, a large number of different information can be obtained by appropriately deciding the reading method according to the position of the mark. It can be easily applied when it is displayed on a casting.

The method for marking a mold according to the second aspect of the present invention, which solves the above-mentioned problems, has the purpose of casting necessary information into a casting, and according to the necessary information on the cavity surface of the mold made of self-hardening sand or gypsum. A method of adding a mark, which is characterized in that after the mark is formed on the cavity surface of the mold which is molded by a mold molding machine and is in a semi-cured state, the mold is completely cured.

This method is applied when a mark is added to a sand mold or a plaster mold made of self-hardening sand. Since the sand mold or gypsum mold is brittle, if the sand mold or gypsum mold molded by the mold molding machine is completely hardened and a mark is formed on the cavity surface by plastic deformation or cutting, the sand mold or gypsum mold May collapse. In the method of the second aspect of the present invention, since the mark is formed on the cavity surface of the mold (self-hardening sand mold or gypsum mold) which is molded by the mold molding machine while being soft, the mold (self-hardening sand mold or gypsum mold) It is possible to form a mark having an arbitrary shape by plastic deformation processing or cutting processing while preventing collapse and with good productivity.

Here, the semi-hardened mold (self-hardening sand mold or gypsum mold) is a mold (self-hardening sand mold or gypsum mold) immediately after being molded by a mold molding machine, which is subjected to plastic deformation or cutting. It refers to a mold (self-hardening sand mold or gypsum mold) in a soft state such that a mark having a desired shape can be formed without breaking the mold. For example, in a sand mold or gypsum mold made of self-hardening sand, a state before the binder such as a resin is completely cured is called a semi-cured state.

A mold marking device according to the present invention for solving the above-mentioned problems is a device for marking a cavity surface of a mold in accordance with the necessary information for the purpose of casting necessary information into a casting. A jig for adding the mark to the cavity surface of the mold, an elevating means for elevating the jig, a moving means for moving the jig in the horizontal direction, and an elevating means and the moving means are controlled. It is characterized by comprising control means and arithmetic means for giving an instruction to the control means.

This device is a device suitable for carrying out the first invention. That is, in order to operate the moving means, the arithmetic means gives an instruction to the control means, the jig is moved in the horizontal direction through the moving means to be positioned at a predetermined position, and then the lifting means is operated. The arithmetic means gives an instruction to the control means, and the jig is lowered through the elevating means. With such an operation, if a jig having a sharp tip is used as the jig, a hole-shaped mark can be easily plastically deformed on the cavity surface of the mold. Further, when a drill is used as the jig, a hole-shaped mark can be easily cut on the cavity surface of the mold by rotating and lowering the jig when lowering the jig.

It is needless to say that the above apparatus can be applied when carrying out the present second invention. That is, by disposing the above device near the mold making machine, the jig is placed at a predetermined position on the cavity surface of the mold (self-hardening sand mold or gypsum mold) in a semi-hardened state immediately after being molded by the mold making machine. The mark having an arbitrary shape can be formed by the plastic deformation process or cutting process used.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to embodiments. (Embodiment) An apparatus for adding marks to a mold, the overall structure of which is schematically shown in FIG. 1, includes a portal frame 3 as a base and a needle as a jig for adding marks to a cavity surface 2a of the mold 2. 14, lifting means (third servo motor type cylinder) 13 for moving the needle 14 up and down, left and right moving means 4 and front and back moving means 8 for moving the needle 14 in the horizontal direction (horizontal direction and front-back direction), and lifting means 13 A control panel 18 as a control means for controlling the left and right moving means 4 and the front-rear moving means 8 and a computing means 16 for giving an instruction to the control panel 18. The front-back direction is the forward / backward direction of the mold 2 sent from a mold making machine (not shown), and the left-right direction is a direction perpendicular to the front-back direction. The gate-shaped frame 3 as a base comprises a rectangular upper frame portion 3a and four leg frame portions 3b, and extends in the longitudinal direction (the same direction as the left-right direction) on the upper surface of the upper frame portion 3a. A pair of rails 5 are laid. In this portal frame 3, the mold 2 with the casting frame 1 sent out from a mold molding machine (not shown) can pass below the portal frame 3 in a direction perpendicular to the longitudinal direction (the same direction as the front-back direction). Thus, it is located near the mold making machine.

On the pair of rails 5 of the gate frame 3,
The traveling platform 6 is installed so as to be able to reciprocate in the longitudinal direction (the left-right direction). This traveling platform 6 has a portal frame 3
The tip of the piston rod 7b of the first servo motor type cylinder 7 mounted on the upper frame 3a of the upper frame 3a is connected, and when the first servo motor type cylinder 7 expands and contracts, the traveling table 6
Are reciprocated in the longitudinal direction of the portal frame 3 (the left-right direction). The traveling table 6 and the first servomotor type cylinder 7 constitute the left and right moving means 4.

A linear guide mechanism 9 extending in the front-rear direction is mounted on the traveling table 6, and a traveling frame 10 is mounted on the linear guide mechanism 9 so as to reciprocate in the front-rear direction. . The tip of a piston rod 11b of a second servomotor type cylinder 11 mounted on the traveling platform 6 is connected to the traveling frame 10, and the traveling frame 1 is expanded and contracted by the second servomotor type cylinder 11.
0 is reciprocated in the front-rear direction. The linear guide mechanism 9, the traveling frame 10, and the second servomotor type cylinder 11 constitute the above-mentioned front-rear moving means 8.

Further, the traveling frame 10 is equipped with a third servo-motor type cylinder 13 as the elevating means, and a needle 14 having a sharp-pointed tip portion is provided at the tip of the piston rod 13b of the third servo-motor type cylinder 13. It is detachably attached. The needle 14 has a sharp tip. Therefore, the needle 14 as a jig can be moved up and down by the elevating means (third servo motor type cylinder) 13, and the needle 14 and the elevating means 13 can be reciprocated in the forward and backward directions by the forward and backward moving means 8. The needle 14, the elevating means 13, and the front-rear moving means 8 can be reciprocated in the left-right direction by the left-right moving means 4.

The servomotor 7a of the first servomotor-type cylinder 7, the servomotor 11a of the second servomotor-type cylinder 11, and the third servomotor-type cylinder 13
The servo motor 13a of the
8 is electrically connected, and the control panel 18 is electrically connected to the computing means 16. In the apparatus having the above-mentioned configuration, a mold (sand mold made of green sand in the present embodiment) 2 with a casting frame 1 continuously sent from a mold making machine (not shown) is positioned directly under a gate-shaped frame 3. Then, the arithmetic means 16 gives a predetermined instruction to the control panel 18,
The left and right moving means 4, the front and back moving means 8 and the elevating means 13 are operated. That is, the needle 14, the elevating means 13, and the forward / backward moving means 8 are moved in the left / right direction by the expansion / contraction operation of the first servomotor type cylinder 7 constituting the left / right moving means 4, and the first servo forming the forward / backward moving means 8 is also performed. By the expansion and contraction operation of the motor type cylinder 11, the needle 14 and the elevating means 13 are moved in the front-back direction, and the cavity surface 2a of the mold 2 is moved.
The needle 14 is positioned right above the added position. And
By the extension operation of the third servomotor type cylinder 13 as the elevating means, the needle 14 is lowered and inserted into a predetermined position of the cavity surface 2a of the mold 2, and the mold 2 immediately after molding is plastically deformed, depending on necessary information. As a mark, a hole-shaped deformation trace is formed on the cavity surface 2 a of the mold 2. It should be noted that the above operation is repeated as necessary, and the cavity surface 2a of the mold 2 is
Multiple marks can be formed on the. In this way,
By using the needle 14 as a jig, a simple hole-shaped mark can be formed at a predetermined position on the cavity surface 2a of the mold 2 by plastic deformation with good productivity.

Then, casting is performed at a predetermined position of the casting by casting using the mold 2 in which a hole-shaped mark is added at a predetermined position of the cavity surface 2a. here,
An example will be described in which, when a hole-shaped mark is formed at a predetermined position on the cavity surface 2a of the mold 2 and the mark is cast on a casting, necessary information is read from the position of the mark printed on the casting.

For example, as shown in FIG. 2, a first mark 21a is provided at a predetermined position on a large-diameter circle (imaginary line) 20a, and a first mark 21a is provided at a predetermined position on a small-diameter circle (imaginary line) 20b. Information can be read by attaching the second mark 21b, the first mark 21a to the time reading of the long hand 22 of the timepiece, and the second mark 21b to the time reading of the short hand 23 of the timepiece. In the case of FIG. 2, it can be read as 3: 4, and from this, for example, information 34 can be read.

Further, as shown in FIG. 3, a mold having a surface shape such as a baseball scoreboard is attached to a model to mold the mold 2, and the cavity surface 2a of the mold 2 has the table 2 shown in FIG.
4 can be transferred and a mark can be formed in the point column of Table 24 to read the number. Therefore, in the present embodiment, since the simple hole-shaped mark is formed using the needle 14 having the sharp tip, even if the mold 2 is a sand mold made of green sand, the mold 2 is effectively prevented from collapsing. The mark can be added to the mold 2 with good productivity while preventing it.

Further, by using the apparatus having the above structure, it is possible to easily and efficiently add a plurality of marks to arbitrary positions on the cavity surface 2a of the mold 2. And
Since the necessary information can be displayed depending on the position where the mark is added, it is possible to display different information for each casting, which is extremely simple and highly productive. In the above embodiment, an example in which a sand mold made of green sand is used as the mold 2 has been described, but it goes without saying that a sand mold made of shell sand, a self-hardening sand mold, or a plaster mold can be used as the mold 2. The sand mold made of shell sand is hard and fragile immediately after molding like the sand mold made of green sand, but in the present embodiment, a simple hole-shaped mark is formed by using the needle 14 having a sharp tip. Therefore, it is possible to add marks to the mold 2 with good productivity while effectively preventing the mold 2 from collapsing. Further, since the self-hardening sand mold and the plaster mold are in a semi-cured state in which the binder such as the resin is not completely hardened immediately after molding, and are soft, a mark is formed on the mold 2 immediately after being molded by the mold molding machine. By doing so, a mark can be added to the mold 2 with good productivity while effectively preventing the mold 2 from collapsing.

Further, in the above-mentioned embodiment, it is also possible to use a jig having a tip end portion having an arbitrary convex shape as the jig. In particular, when a self-hardening sand mold or a plaster mold is used for the mold 2, if a mark is formed while the semi-hardened state is soft immediately after molding, a mark of an arbitrary shape can be formed at a predetermined position on the self-hardening sand mold or the plaster mold. In addition, it is possible to form the film easily and with good productivity while preventing the deformation of the mold. It is also possible to form a mark by cutting using a cutting tool as a jig.

Further, in the above-mentioned embodiment, since the needle 14 having a sharp tip is used as a jig, when a self-hardening sand mold or a plaster mold is used as the mold 2, these molds are completely hardened. Even in the latter state, a simple hole-shaped mark can be formed on the cavity surface 2 of the mold 2 while satisfactorily preventing the mold 2 from collapsing.

[0024]

As described above in detail, according to the present invention, a mold which is fragile and requires one mold for one casting article can be manufactured while preventing mold collapse. It is possible to add a good mark. That is, the method of adding a mark to the mold of the first aspect of the present invention forms a simple hole-shaped mark at a predetermined position on the cavity surface so that the necessary information can be read according to the position of the mark added to the cavity surface. Therefore, even with a mold made of sand or gypsum, it is possible to form a mark with good productivity while preventing the mold from collapsing. Further, since the necessary information is read by the position of the hole-shaped mark formed on the cavity surface, it is possible to extremely easily and productively in large numbers by appropriately deciding the reading method according to the position of the mark. It is possible to display different required information on the casting.

Further, the method of adding a mark to the mold of the second invention is as follows:
Since a mark is formed on the cavity surface of a soft mold (self-hardening sand or gypsum mold) that has been molded by a mold molding machine and is in a semi-hardened state, it is possible to prevent the mold from collapsing and to make a mark of any shape with good productivity. Can be formed.

[Brief description of drawings]

FIG. 1 is a perspective view schematically showing an overall configuration of an apparatus for adding marks to a mold according to the present embodiment.

FIG. 2 is a diagram illustrating an example in which necessary information is read by a mark of a hole shape formed at a predetermined position on a cavity surface of a mold.

FIG. 3 is a diagram illustrating an example in which necessary information is read by a mark of a hole shape formed at a predetermined position on a cavity surface of a mold.

[Explanation of symbols]

2 is a mold, 2a is a cavity surface, 4 is a lateral movement means, 7
Is a forward / backward moving means, 8 is a lifting means, 14 is a needle as a jig, 18 is a control panel as a control means, and 16 is a computing means.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Etsushi Hayashi 1 Toyota-cho, Toyota-shi, Aichi Prefecture Toyota Motor Corporation (72) Inventor Etsuzo Kawai 203-3, Akebono-cho, Toyohashi-shi, Aichi (72) Inventor Shigeaki Yamamoto 32-556 Norikoji, Ushikawa-cho, Toyohashi-shi, Aichi (72) Inventor Shinji Shirai 1 of 50, Hikariji, Kozakai-cho, Takai-gun, Aichi

Claims (3)

[Claims] 1. A method of adding a mark to a cavity surface of a mold according to the necessary information for the purpose of casting the necessary information into a casting, wherein the necessary information is determined by the position of the mark added to the cavity surface. The method for adding a mark to a mold is characterized in that a hole-shaped mark is formed at a predetermined position on the cavity surface so that the mark can be read. 2. A method for marking a cavity surface of a mold made of self-hardening sand or gypsum according to the necessary information for the purpose of casting necessary information into a casting, which is produced by a mold making machine. A method for adding a mark to a mold, comprising forming a mark on the cavity surface of the mold in a cured state and then completely curing the mold. 3. An apparatus for adding a mark to a cavity surface of a mold in accordance with the necessary information for the purpose of casting necessary information into a casting, and a device for adding the mark to a cavity surface of the mold. Tool, elevating means for elevating and lowering the jig, moving means for horizontally moving the jig, control means for controlling the elevating means and the moving means, and computing means for giving an instruction to the control means. An apparatus for adding marks to a mold, characterized by comprising: