JP2575730B2 - Frameless solid mold making machine - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a frameless solid mold making apparatus.

(Prior Art) In general, in a frameless rigid mold molding apparatus, as shown in FIG. 4, a rigid frameless molding machine 1 configured to mold a frameless mold M, and the rigid frameless mold molding machine Is provided with a transport line 2 for transporting the frameless molds M, M... Sequentially formed by the machine 1 in a connected state, and a pouring device 3 provided at a pouring position in the middle of the transport line 2. The pouring position of pouring device 3 is usually determined in advance. However, even when molding the same product, the mold thickness T of the frameless mold M molded by the molding machine 1 depends on various conditions at the time of molding, for example, changes in sand properties or the amount of sand charged into the molding machine. Of the pouring position will be shifted in the front-rear direction from a place that is not constant due to a variation or the like.

To cope with the displacement of the pouring position as described above, it is necessary to move the pouring device along the transport line, and various devices have been conventionally devised. For example, a method of providing a notch serving as a mark on the mating surface of the frameless mold, detecting the notch with a sensor, and moving the pouring device is employed.

(Problems to be Solved by the Invention) As can be seen in the above prior art, in the method of detecting a notch formed on the mating surface of a frameless mold with a sensor and moving the pouring device, the method of moving the pouring device And the problem that the cycle time becomes longer remains.

The present invention has been made in view of the above points, and without moving the pouring device, to shift the pouring port in the front-rear direction, by changing the mold thickness of the newly molded frameless mold. It is an object of the present invention to shorten the cycle time and prevent a pouring error by taking measures.

(Means for Solving the Problems) In the present invention, as a means for solving the above problems, a rigid frameless molding machine configured to mold a frameless mold, and a rigid frameless type molding machine. Pouring a molten metal into a pouring line that is provided at a pouring position in the middle of the conveying line that conveys the frameless mold molded by the molding machine in a continuous state, and that is formed between adjacent frameless molds. In a frameless rigid mold making apparatus provided with a pouring device configured as described above, a mold thickness measuring means for measuring a mold thickness of a frameless mold to be molded, and a frameless frame arranged to a pouring position on the transport line. Calculating means for calculating the distance to the pouring port corresponding to the pouring device based on the number of molds; comparing means for comparing the distance to the pouring port calculated by the calculating means with the reference distance to the pouring device; And the next molding based on the result of the comparing means And a controller having mold thickness control means for increasing or decreasing the mold thickness of the frameless mold to be formed.

(Operation) In the present invention, the following effects are obtained by the above means.

That is, the mold thickness of the frameless mold to be molded is measured for each mold, and the distance to the pouring port corresponding to the pouring device calculated based on the number of frameless molds lined up to the pouring position on the transport line is calculated. By comparing the gap with the gap to the pouring device and increasing or decreasing the mold thickness of the frameless mold to be molded next time based on the result, the pouring port can be moved without moving the pouring device. Can be dealt with by changing the mold thickness of the newly formed frameless mold, thereby shortening the cycle time and preventing pouring errors.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings.

As shown in FIG. 4, a frameless rigid molding machine A of the present embodiment comprises a rigid frameless molding machine 1 configured to mold a frameless mold M, and a rigid frameless molding machine A 1. Conveying line 2 that conveys frameless molds M, M.
And a pouring device 3 provided at a pouring position in the middle of the transport line 2 and configured to pour molten metal into a pouring port 4 formed between adjacent frameless molds M, M. I have.

As shown in FIG. 1, the molding machine 1 is installed at the most upstream position of the transport line 2 and has a molding chamber 7 composed of a front mold 5 and a rear mold 6 and sand S is fed to the molding chamber 7 by pressure. A hopper 8, which is configured to operate, front and rear mold pistons 9, 10 for operating the front mold 5 and the rear mold 6 in the mold clamping direction, and hydraulic cylinders 11, 10 for operating these pistons 9, 10. It is composed of 12 and. The front mold 5 is rotatably supported with respect to the support frame 13 so as to be retracted after clamping. The support frame 13 is connected via a rod 15, 15,... To a connection frame 14 provided at the end of the front die piston 9 extending rearward. on the other hand,
The rear die 6 is directly connected to the tip of a rear die piston 10 extending in the opposite direction (ie, forward) from the front die piston 9. As the hydraulic cylinders 11 and 12, those having an encoder are employed.
The supply and discharge of pressurized oil to and from is controlled by the control valve 18.

Thus, in this molding machine 1, the molding chamber 7 having a predetermined pattern set dimensions T ₀ by the front mold 5 and a rear-type 6 in a state in which a piston 9, 10 by a hydraulic fluid control by the control valve 18 was allowed predetermined stroke extension After the sand S is pressure-fed to the molding chamber 7 from the hopper 8 by air blow, both pistons are actuated by the operation of the hydraulic cylinders 11 and 12.
By moving the front mold 5 and the rear mold 6 in the mold clamping direction by the further extension operation of 9, 10, the frameless mold M is formed (see FIG. 3). The pattern set dimensions
By changing the T _0, so that the mold thickness T of the unframed mold M to be molding is varies. The frameless mold M thus formed is sent out onto the conveying line 2 by the extension operation of the rear mold piston 10 after the front mold 5 is retracted, and the preceding frameless mold already lined up on the conveying line 2. Operate M, M ... forward.

The hydraulic cylinders 11 and 12 have stroke detection sensors 16 and 1 for detecting the operation strokes of the pistons 9 and 10.
7 are provided, and these stroke detection sensors 16,
Frameless mold M formed by the stroke detection value from 17 (that is, the working stroke from the retreat limit of pistons 9 and 10)
Of the mold thickness T is measured. That is, these stroke detection sensors 16 and 17 function as mold thickness measuring means.

The frameless rigid mold making apparatus A of the present embodiment has a mold thickness measuring means (that is, the stroke detection sensors 16 and 1).
Based on the input signal from the 7), the control unit 19 for outputting a command to set the pattern set dimensions T ₀ to a predetermined size is attached to the control valve 18 (see FIG. 1). The control device 19 is composed of a microcomputer, and the mold thicknesses T ₁ , T ₂ , T _{3. Of} n frameless molds M, M... .. A comparison between the calculating means for calculating the added value ΣTi (i = 1 to n) of Tn and the calculation result ΣTi by the calculating means and the preset reference distance L to the pouring device 3 Means and a mold thickness control means for acting to increase or decrease the mold thickness T of the frameless mold M to be formed next based on the result of the comparison means (see FIG. 2). The increase or decrease the mold thickness T, interval before type 5 and the rear-type 6 by the piston 9 and 10, i.e. it is sufficient Seshimere increase or decrease the pattern set dimensions T ₀ of the molding chamber 7, in effect, the control valve This is performed by controlling the strokes of the pistons 9 and 10 by controlling the supply of the pressure oil to 18.

Next, the operation of the frameless solid mold making apparatus A according to the present embodiment will be described with reference to the flowchart shown in FIG.

After the sand S is pumped from the hopper 8 to the molding chamber 7 of the molding machine 1, the pistons 9, 1 driven by the hydraulic cylinders 11, 12 are provided.
By the extension operation of 0, the sand S in the molding chamber 7 is pressurized by the front and rear molds 5 and 6, and the frameless mold M is molded. The working stroke of the piston 9, 10 at this time is detected by the stroke detecting sensor 16 and 17, the mold thickness Ti of unframed mold M that are molding based on the stroke detection value is input (Step S _1). The measurement of the mold thickness Ti is performed for each molding of the frameless mold M, and the mold thickness of each of the n frameless molds M, M,... An added value ΣTi of Ti (i = 1 to n) is calculated (step S ₂ ). Thereafter, the addition value ΔT is compared with a preset reference distance L to the pouring device 3 (step S ₃ ), and the result (ΔT−L) is compared with the pouring device 3 and the pouring port. When the relative position with respect to the mold 4 is closer to the range exceeding the pouring possible position, the pattern set size of the molding chamber 7 to increase or decrease the mold thickness T of the frameless mold M to be molded next.
By a hydraulic fluid supply control is a control valve 18 to the hydraulic cylinders 11, 12 for allowing increase or decrease the T _0, is performed as follows.

That is, (1) When −α <(ΣTi−L) <α (step S ₃ ),
Without changing the pattern set dimensions T ₀ of the molding chamber 7 performs molding of unframed mold M (Step S _4), thus the step S ₁ as a mold thickness T new data molding has been unframed mold M Is input to

(2) If (ΣTi−L) <− α (step S ₅ ), the stroke of the pistons 9 and 10 is controlled by the control of the pressure oil supply by the control valve 18, and the pattern set dimension of the molding chamber 7 is set.
By increasing T ₀ (step S ₆ ), the mold thickness T of the frameless mold M to be formed is increased. The under conditions subjected to molding of unframed mold M (Step S _7), thus molding the thickness T of the molding has been unframed mold M is input to the step S ₁ as new data.

(3) If α <(ΣTi−L) (step S ₅ ), the stroke of the pistons 9 and 10 is controlled by the control of the pressure oil supply by the control valve 18, and the pattern set dimension T ₀ of the molding chamber 7 is set.
The made smaller (Step S _8), so that the mold thickness T of the unframed mold M to be molding is reduced. The under conditions subjected to molding of unframed mold M (Step S _9), thus molding the thickness T of the molding has been unframed mold M is input to the step S ₁ as new data.

By controlling as described above, the displacement between the pouring device 3 and the pouring port 4 is corrected by increasing or decreasing the pattern set dimension T ₀ of the molding chamber 7 without performing the movement correcting control of the pouring device 3. It is possible to eliminate moving loss time, and
The pouring port 4 formed therebetween is positioned in a range where pouring can be performed by the pouring device 3, and pouring mistakes are prevented.

The present invention is not limited to the configuration of the above embodiment, and it is needless to say that the design can be appropriately changed without departing from the gist of the invention.

(Effects of the Invention) As described above, according to the present invention, a rigid frameless molding machine configured to mold a frameless mold, and a frameless mold molded by the rigid frameless molding machine And a pouring device provided at a pouring position in the middle of the conveying line and configured to pour molten metal into a pouring port formed between adjacent frameless molds. A frameless rigid mold making apparatus, comprising: a mold thickness measuring means for measuring a mold thickness of the frameless mold to be molded; and the pouring based on the number of frameless molds lined up to the pouring position on the transport line. Calculating means for calculating the distance to the pouring port corresponding to the apparatus, comparing means for comparing the distance to the pouring apparatus calculated by the calculating means with the distance to the pouring device, and the next time based on the result of the comparing means. Work to increase or decrease the mold thickness of the frameless mold to be molded A control device having mold thickness control means to be used is attached, and the mold thickness of the frameless mold to be molded is measured for each mold, and based on the number of frameless molds lined up to the pouring position on the transport line. Since the calculated distance to the pouring port and the distance to the pouring device corresponding to the calculated pouring device were compared, the mold thickness of the frameless mold to be formed next time was increased or decreased based on the result. In addition, the displacement of the pouring port in the front-rear direction can be dealt with by changing the mold thickness of the newly formed frameless mold without moving the pouring device, thereby shortening the cycle time and reducing pouring errors. There is an excellent effect that prevention can be achieved.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a molding machine in a frameless rigid mold molding apparatus according to an embodiment of the present invention when a pattern is set, and FIG.
Fig. 3 is a diagram showing the function of the control device in the frameless rigid mold molding apparatus shown in Fig. 1; Fig. 3 is an enlarged vertical sectional view of the molding machine shown in Fig. 1 during molding; Fig. 4 is a frameless rigid mold. FIG. 5 is a plan view of the mold making apparatus, and FIG. 5 is a flowchart for explaining the operation of the frameless rigid mold making apparatus according to the embodiment of the present invention. DESCRIPTION OF SYMBOLS 1 ... Molding machine 2 ... Conveying line 3 ... Pouring device 4 ... Pouring port 16,17 ... Mold thickness measuring means 19 ... Control device A ... Frameless rigid mold molding device M ... Frameless Mold T: Mold thickness

Claims (1)

(57) [Claims] 1. A rigid frameless molding machine configured to mold a frameless mold, a transport line for transporting the frameless mold molded by the rigid frameless molding machine in a connected state, A frameless solid mold making apparatus comprising: a pouring device provided at a pouring position in the middle of the transport line, and configured to pour molten metal into a pouring port formed between adjacent frameless molds. A mold thickness measuring means for measuring the mold thickness of the frameless mold to be molded, and a distance to a pouring port corresponding to the pouring device based on the number of frameless molds lined up to the pouring position on the transport line. Means for calculating the distance between the pouring port calculated by the calculating means and the reference distance to the pouring device, and a mold for a frameless mold to be formed next time based on the result of the comparing means. Mold thickness control means that acts to increase or decrease the thickness Unframed hard casting mold making system in which a controller for is characterized in that it is attached.