JPH0475747A - Method and apparatus for automatically and continuously melt-sticking lost wax parts for casting - Google Patents

Abstract

PURPOSE:To stabilize quality of melt-sticking, and to shorten the time of melt- sticking and to improve the productivity by continuously conveying lost wax parts with pallet and melt-sticking to a tree in order under the specified melt- sticking condition. CONSTITUTION:The lost wax parts 4 are shifted to a discharging position A in one direction along a dovetail groove with a discharging pin 3c and discharged. The lost wax parts 4 discharged from the pallet 1a are held by a chuck 5f and conveyed just below a vertical shifting shaft 6a in a melt-sticking head 5. A heated melt-sticking spatula 5a is shifted below the lost wax parts 4. The melt-sticking spatula 5a is inserted in between the lost wax parts 4 and the tree 7 by a cylinder 5d and abutted on the upper face of the tree 7 and a sprue part 4a on the lower face of the lost wax parts 4 in order and melted. The melt-sticking spatula 5a is pulled in the horizontal direction and the chuck 5f is descended by the vertical shifting shaft 6a and the lost wax parts 4 are pushed to the tree 7 and both are closely brought into contact with each other and melt-stuck.

Description

Detailed Description of the Invention <Industrial Application Field> The present invention relates to an automatic continuous welding method and apparatus for lost wax parts for casting. ) is used as a model, and the surrounding area is filled with a molding material made of an aqueous solution of ethyl silicate mixed with sand grains such as alumina, and after hardening, heating is performed to melt the wax and create a model.
Since sand with a small coefficient of thermal expansion is used, castings with high dimensional accuracy can be made.

Conventionally, welding between a lost wax part for casting, which is a wax model, and a tree that forms a runner made of the same material is 2 g thick + 3 g thick.
0mm, length 100 - made of customary metal! [Heat the spatula with an electric heater, insert it between the lost wax parts and the tree, press the lost wax parts against the tree by hand,
The process of melting the lost wax parts and the tree, checking the molten state of both, pulling out the welding spatula, and welding the two together is repeated as many times as necessary.

<Problems to be Solved by the Invention> However, since the welding operation described above is manual, there are the following problems. In other words, (a) productivity is low and efficiency is poor.

(b) It is difficult to ensure consistent welding quality (shape and dimensions, for example, accurate welding position). When the number of workpieces is large and the work takes a long time, worker fatigue increases and efficiency decreases.

(c) Since the heating of the welding knife usually involves welding several lost wax parts at a time, it is necessary to heat the welding knife to an excessively high temperature above the melting temperature of the wax. become

(d) Several welding sticks are heated in the electric heater, and the attached wax is gasified. As a result, the working environment deteriorates due to the generated gas, which may cause damage to the workers' bodies, especially their eyes and respiratory organs.

For the above reasons, there is a need for automatic continuous welding of lost wax parts that has high productivity, ensures constant welding quality, and does not degrade the working environment.

An object of the present invention is to provide an automatic continuous welding method and apparatus for lost wax parts for casting that solve the above-mentioned problems.

<Means for Solving the Problems> In order to achieve the above object, the method for automatic continuous welding of lost wax parts for casting according to the present invention involves fitting a plurality of lost wax parts made of wax along dovetail grooves. Place the pallet in a direction perpendicular to the dovetail groove and move it to the payout position τ to remove the lost wax parts from the pallet! It moves in one direction along the groove and is discharged from the pallet.
Heating the welded parts to below the melting temperature of the wire using an electric heater ζ; Grasping the 1st wax parts discharged from the pallet with a chuck () Transporting them directly below the J double driving wheel of the 2nd welding 2at. , move the heated welding parts directly below the lost wax parts directly below the vertical axis of the welding head, and move the lower driving wheel of the welding head along with the lost wax parts and the welding part to a tree made of the same material as the lost wax parts. Transfer the lost wax parts directly above the melting equipment 1, insert the welding material between the lost wax parts and the tree 7, move the welding material up and down from the cylinder ζ, and place the welding material on the top of the tree. and the bottom surface of the lost wax component in sequence,
After melting, pull out the welding rod horizontally, lower the chuck using the vertical axis of the welding head, press the lost wax part against the tree, bring them into close contact, and weld them. This process also consists of blowing hot air onto the welds to melt and wash away the wax adhering to the welds.

Further, the automatic continuous welding device for lost wax parts for casting according to the present invention includes a bar knocking device feeding device, a pallet discharging device,
It consists of a lost wax parts dispensing device, a welding head, a robot hood, and a cleaning device, and the pallet transport device fits the lost wax parts. A pallet with
The bar 1/lot discharge device arranges empty pallets in a direction perpendicular to the dovetail groove and consists of a straight track that guides them. The lost wax parts are dispensed in one direction along the dovetail groove and moved to the first position.
Second, an electric heater that is integrated with the welding distance where heating is performed and can be moved horizontally and vertically, a chuck that grasps the lost wax parts 4 discharged from the pallet and transports them directly below the vertical axis of the welding head, and a robot head. is connected to the welding head via a vertically moving shaft so that it can be transported directly above the welding position of the lost wax parts on a tree made of the same material as the lost wax parts, and the welding machine is installed between the chuck and the tree. An air source that supplies air, a serpentine pipe that passes the air, an electric heater that heats the air through the serpentine pipe, a barn nozzle that spews out #M, and a molten gas that opens near the nozzle. The continuous automatic welding method and device for lost wax parts for casting constructed as described above are all mechanized, such as transporting lost wax parts, melting the parts and the tree using a melting tool. - Automation eliminates manual work, stabilizes welding quality, improves productivity, lowers the heating temperature of welding materials, significantly reduces the generation of harmful gases, and improves the working environment. will be changed to Vt.

〈Example〉 Embodiment t To explain further with reference to the drawings, l is a pallet progressive feeding device, and a barrette (1a) in which a plurality of lost wax parts 4 made of octopuses are fitted along a dovetail groove. ,
1Ili line trajectory 16.1 in the direction perpendicular to the dovetail groove
d to the payout position -8. In addition,
Me is a cylinder for transporting the pallet l&, and If and if are feeding pins attached to the transport cylinder 1a.

2 is the empty barrel after discharging lost wax part 4)
Pallet discharge device for discharging lc, 2a.

2a is a linear track for guiding the pallet IC, and 2b is a cylinder for transferring the pallet 1c.

3 is a lost wax parts dispensing device, which is equipped with a driving cylinder ab, a dispensing pin operating section 3, and a dispensing pin 3C, and is used to dispense lost wax parts from a pallet 1a! It moves in one direction (to the right II in the drawing) along IIIIIID to the dispensing position and dispenses.

5 is a welding head, which is constructed as follows. That is, 5a is a welder, 5b is an electric heater that heats a thousand 1li5a by sandwiching it above and below, 5c95d and 5e are cylinders, and cylinders 5cT and 5d move the welding tr5a and the electric heater 5b vertically and horizontally, respectively. The cylinder 5e is the pallet 1.
A chuck 5fte1 that grips and conveys the lost wax component 4 discharged from a! It is something that moves. 5g? ,
This is a palpation sensor that measures the vertical position of the welding point of the i-cost wax part 4.

6 is a robot head that moves the welding head 5 up and down via a vertical drive wheel 6a.

A tree 8 for welding the lost wax parts 4 is a cleaning device for welding, which is disposed between the chuck 5f and the tree 7, and electrically heats the air supplied from the air source 8d while passing it through the flexible pipe 8b. The hot air heated by the heater 8c is ejected from the hot air nozzle 8a having a welding head insertion slot 8ec4: WJ opening, and the hot air is blown onto the welding part 1 [5a to melt and clean the wax attached to the welded part 5a. It is something to do.

Next, the effect will be explained. (Barre) Insert a plurality of lost wax parts 4 from one end of the dovetail groove of 1a,
Sequentially, the pallets 1a are arranged in a direction perpendicular to the dovetail IID and moved to the payout position A by the cylinder 1e and pallet feed pin If.

The lost wax component 4 is moved in one direction along the dovetail #1D to the payout position A by the driving cylinder 3b of the payout 1H13 and the payout pin 3c driven by the payout pin operating section 3a, and is paid out.

The pallet lc, which has become empty after discharging the lost wax parts 4, is driven by the transfer cylinder 2b of the pallet discharge device, and is guided along the linear tracks 2a, 2a and discharged.

The cost wax component 4 discharged from the pallet 1a is gripped by a chuck 5f of the cylinder 5e and conveyed directly below the vertical driving wheel 6a of the welding head 6.

The cylinder 5d moves the heated welding IE 5a below the lost wax component 4 directly below the vertical drive wheel 6a of the welding head 5. Note that the welded portion 5a is always heated to a temperature higher than the melting temperature of the wax by an electric heater 5b.

Furthermore, the welding head 5 is welded to the lost wax parts 4 and the upper and lower driving wheels 6a! [Along with 5a, the tree 7 made of the same material as the lost wax part 4 is moved directly above the welding position B of the lost wax part 4.

As shown in FIG. 2, the welded part 5a is inserted between the lost wax part 4 and the tree 7 using the cylinder 5d,
The cylinder 5c moves the welding part δa up and down, so that the welding part 115a sequentially contacts the top surface of the tree 7 and the sprue part 4a on the bottom surface of the lost wax component 4, and is melted. At this time, the upper and lower positions of the welding point of the lost wax component 4 are measured in advance using the palpation sensor 5g, and the welding II 5a is lowered deeply by the welding distance determined based on the results, and the surface of the tree 7 is melted. Next, the welded part 5a is pulled out horizontally using the cylinder 5d, and the vertical movement shaft 6
a, the chuck 5f is lowered to press the lost wax component 4 against the tree 7, bringing them into close contact and welding them by the crimping margin.

After releasing the chuck 5f and moving the welding head 5 to remove it, the welding j15a is inserted into the welding part insertion port 8e, and the air supplied from the air source 8d is heated by the electric heater 8C while passing through the flexible pipe 8b. The hot air thus created is ejected from the hot air nozzle 8a and sprayed onto the welded part 5a.
Melt and clean the wax that adheres to the surface.

After the welding W5a cleaning is completed, the welding head 5 is returned to the dispensing position A and the above operation is repeated again.

<Effects of the Invention> The present invention is configured as described above, and the lost wax parts 4 are continuously transported on the pallet 1a and are welded to the tree one after another under constant welding conditions, thereby reducing the trade of welded products. It is stable, the welding time is short, and productivity is high.Moreover, the welding part is always kept at a constant and relatively low temperature, so there is little overheating of the wax, the gasification rate is small, and there is little generation of harmful gases. There is almost no harm to the body.Furthermore, even if harmful gases are generated, the device of the present invention is fully automated, so the device can be surrounded by an enclosure, making it easy to eliminate the generated gases from harm. It is possible to maintain a clean work environment and is safe.

[Brief explanation of the drawing]

Figure 1 shows an embodiment of the present invention; Figure 2 (A) is a perspective view;
~(g) is a process diagram showing the progress of welding between the lost wax parts and the tree, Fig. 3(r) and i are perspective views of the lost wax parts, and Fig. 4 is a sectional view of the welding area cleaning device used in the present invention. Below 8 1 Pallet transport device 1a, lb, Ic Pallet 1d Straight track 1e Cylinder 1f Pallet feed pin 2 Pallet discharge device 2a Straight track 2b Cylinder 3 Parts payout device 3a Payout pin operating section 3b Cylinder 3C payout pin 4 R2 stowage parts Dark welding head Welding field Electric heater Cylinder chuck Palpation sensor Robot head Vertical moving axis Tree Welding area cleaning device Hot air nozzle Serpentine electric heating heater Air source Welding area insertion opening Payout position Parts insertion Dovetail groove (D) (G) Figure 2 ( e) (f) Figure 4 Figure 3

Claims (1)

[Claims] [1] A pallet (1a) in which a plurality of lost wax parts (4) are fitted along the dovetail groove (D) is arranged in a direction perpendicular to the dovetail groove (D), and the pallet (1a) is placed at a delivery position. (A), move the lost wax part (4) from the pallet (1a) in one direction along the dovetail groove (D), and take it out from the pallet (1a), move the welding spatula (5a) to the wax part (5a). electric heater (5
b) heating the lost wax parts (
4) with the chuck (5f) and attach it to the welding head (5).
) of the welding head (5) directly below the vertical axis (6a) of the welding head (5); Together with the wax part (4) and the welding knife (5a), move the vertical movement axis (6a) of the welding head (5) to the welding position of the lost wax part (4) on the tree (7) made of the same material as the lost wax part (4). B) Transfer directly above the lost wax part (4) and the tree (7), insert the welding knife (5a) and move the welding knife (5a) up and down with the cylinder (5c) to weld. Tree (5a)
7) After sequentially contacting the upper surface and the lower surface of the lost wax component (4) and melting, the welding spatula (5a) is pulled out in the horizontal direction, and the vertical movement shaft (6a) of the welding head (5) is used to
Lower the chuck (5f) and remove the lost wax parts (
4) is pressed against the tree (7), the two are brought into close contact and welded, and hot air is blown onto the welding spatula (5a) to melt and wash the wax adhering to the welding spatula (5a). Automatic continuous welding method for lost wax parts. [2] Pallet transport device (1), pallet discharge device (2)
), lost wax parts dispensing device (a), welding head (5), robot head (6), and welding spatula cleaning device (8)
), and the pallet (1) is equipped with grooves (D) into which the pallet conveying device (1) fits the lost wax parts (4).
a), the pallet (1a) is arranged in a direction perpendicular to the dovetail structure (D), and consists of a linear trajectory (1d, 1d) that guides it;
The pallet discharge device (2) arranges empty pallets (1c) in a direction perpendicular to the dome scheme (D) and guides them on a straight track (2a).
, 2a), and a lost wax parts dispensing device (3
) moves the payout pin operation part (3a) and the lost wax component (4) in one direction along the dovetail groove (D) to the payout position (
It consists of a payout pin (3c) that moves the welding head (5) to A), and the welding head (5) can be moved horizontally and vertically together with the welding kettle (5a) that heats the welding kettle (5a) to a temperature higher than the melting temperature of the wax. electric heater (5b), pallet (1a
), grip the lost wax part (4) discharged from the
The chuck (5f) is conveyed directly under the vertical axis (6a) of the welding head (5), and the robot head (6) is attached to the welding head (5).
5) through the vertical movement shaft (6a) to the lost wax part (
Lost wax parts (4) of tree (7) made of the same material as 4)
The welding spatula cleaning device (8) is connected directly above the welding position (B) of the chuck (5f) and the tree (7) so that it can be transported.
) and an air source (
8d), the serpentine pipe (8b) that passes the air, the serpentine pipe (8b)
), a hot air nozzle (8a) that blows out hot air, and a welding spatula insertion port (8e) opened near the hot air nozzle (8a). Lost wax parts for casting. Automatic continuous welding equipment.