JP4583341B2 - Manufacturing method of cast iron control wheel for railway vehicle - Google Patents

Description

  The present invention relates to a method of manufacturing a cast iron brake for a railway vehicle used in a braking device for a railway vehicle.

  Conventionally, a brake mechanism for a railway vehicle has a tread method and a disk method, and a tread method has been widely used for conventional lines. In this tread method, a brake is pressed against the tread of a wheel to obtain a braking force. Cast iron casters for railcars of the tread type have a foam-like ceramic in which countless continuous air holes are formed in addition to those in which the components of the cast iron alloy constituting the brake control are changed in order to improve braking performance. Some blocks (braking blocks) are cast into the control wheel.

In the manufacturing method of a control device in which the ceramic block is cast, first, a back plate made of a mild steel plate is arranged in a lower mold in a cavity for forming the control device, and the ceramic block is arranged on the back plate. Then, the upper mold for forming the braking friction surface is placed on the lower mold, and then the molten metal is supplied into the cavity. Then, the ceramic block floats up to the surface that forms the braking friction surface of the upper mold due to the difference in specific gravity with the molten metal, and the control body is formed with one side surface of the ceramic block exposed to the braking friction surface (for example, Patent Document 1).
As another manufacturing method of the control device, the ceramic block is fixed so as to be exposed to the braking friction surface at a predetermined interval on the back plate arranged in advance in the lower mold, and then the molten metal is supplied into the cavity. There is also a method of forming a control wheel body in which a ceramic block is cast (see, for example, Patent Document 2).
Japanese Patent No. 3261478 JP 2001-246455 A

However, in the technique disclosed in Patent Document 1, since it is difficult to fix the ceramic block in the cavity, there is a possibility that the ceramic block floats while the molten metal is being supplied into the cavity. There is a problem that the ceramic block cannot be arranged at an appropriate position on the braking friction surface of the control depending on the cast-in state of the block, resulting in variations in product quality.
In the technique disclosed in Patent Document 2, since it is necessary to fix the ceramic block to the back plate in advance, it is necessary to provide a block stopper on the back plate by welding or the like. For this reason, there exists a subject that the manufacturing cost of a control wheel starts.

  Therefore, the present invention can eliminate variations in product quality by placing the ceramic block cast in the brake on the brake friction surface at an appropriate position, and stabilize and improve the brake performance of the brake. The present invention provides a method of manufacturing a railcar brake device that can be used. It is another object of the present invention to provide a method for manufacturing a cast iron control device for a railway vehicle, which does not require a block stopper for fixing the ceramic block and can reduce the manufacturing cost.

In order to solve the above problems, the invention described in claim 1 is characterized in that a back plate is disposed on the lower mold side in a cavity formed by an upper mold and a lower mold, and a base portion of a guide rod is disposed on the lower mold. Is inserted and fixed through the back plate, the tip of the guide rod is secured as a protruding amount to the cavity side, a brake block is slidably inserted into the guide rod, and after clamping, it is placed in the cavity. The molten metal is supplied, and the molten metal is caused to float along the guide rod to the braking friction surface forming surface by a specific gravity difference by the molten metal so that one side surface of the braking block is brought into contact with the braking friction surface forming surface, and the braking is performed. A method of manufacturing a cast iron control device for a railway vehicle that manufactures a control wheel main body in a state in which a block is cast , and when the guide rod is inserted into the lower mold, the amount of protrusion of the guide rod is retained. As said Jig for receiving the tip of de rod, characterized by using detachably attached to the guide rod.

The invention described in claim 2 is characterized in that the brake block is provided with a hole for loosely inserting the guide rod.

The invention described in claim 3 is characterized in that the braking block is formed of foamed silicon carbide ceramics in which an infinite number of continuous air holes are formed.

  According to the present invention, the back plate is disposed in the lower mold of the cavity, the base of the guide bar is inserted into the through hole of the back plate in the lower mold, the tip of the guide bar is secured as a protruding amount to the cavity side, and The brake block is slidably inserted into the guide rod, the upper mold that forms the braking friction surface is placed on the lower mold, and the mold is clamped, and then the molten metal is supplied to the cavity. The brake body can be formed with the brake friction surface forming surface of the mold ascending along the guide rod, with one side surface thereof being brought into contact with the brake friction surface forming surface, and the brake block being cast. Therefore, it is possible to arrange the braking block at an appropriate position with respect to the braking friction surface without increasing the number of manufacturing steps, and it is possible to stabilize and improve the braking performance of the control device by eliminating the product quality variation. Become.

  In addition, since the brake block is inserted into the guide rod inserted into the lower mold, it is not necessary to perform work such as welding a block stopper for fixing the brake block to the back plate. For this reason, manufacturing cost can be reduced.

Next, embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1 to FIG. 3, a cast iron control device 1 for a railway vehicle is obtained by providing a cast iron block 3 on a back plate 2 that is curved in an arc shape.
The cast iron block 3 is formed of alloy cast iron to which an alloy element such as nickel or chromium is added in consideration of heat resistance, wear resistance, and the like. A concave portion 9 having a V-shaped cross section is formed in the longitudinal center of the cast iron block 3 along the width direction of the cast iron block 3, and the cast iron block 3 is arranged in two portions 3a and 3b with the concave portion 9 in between. It has a structured.
The braking friction surface 6 facing the wheel 11 of the cast iron block 3 is formed to be concavely curved so as to correspond to the tread surface 12 of the wheel 11. Further, the back surface 7 on the back plate 2 side of the cast iron block 3 is formed to be curved in a convex shape along the back plate 2.

  Further, a pair of ceramic blocks 8, 8 are cast into the cast iron block 3. Ceramic blocks 8 and 8 are disposed on cast iron blocks 3a and 3b, respectively. The ceramic block 8 is a foam formed by sintering silicon carbide powder and is formed in a columnar shape, and an infinite number of continuous air holes are formed on the whole, and the opening ratio is 85 to 94%. The ceramic block 8 is entirely cast when the cast iron block 3 is cast, with one side surface exposed to the braking friction surface 6 of the cast iron block 3, and countless continuous air holes are filled with cast iron. It is in a state.

A hole 13 for inserting the guide rod 10 is formed at the approximate center of the ceramic block 8, and the guide rod 10 is inserted into the hole 13.
The guide bar 10 is formed in a columnar shape or a cylindrical shape, and is inserted into the cast iron block 3 through the back plate 2.

  The back plate 2 is formed by bending a plate-like steel having elasticity so as to follow the rail wheels 11. A pair of holes 14 is formed in a portion corresponding to the guide bar 10 of the back plate 2. Also, a substantially mouth-shaped connecting ring 4 is provided on the outer surface 2 a at the substantially center in the longitudinal direction of the back plate 2. The connecting ring 4 forms a cotter part 5 of the cast iron control device 1 for a railway vehicle. The cotter portion 5 has a substantially trapezoidal cross section, and the cotter portion 5 is provided on the outer surface 2 b of the back plate 2 so as to follow the width direction of the back plate 2.

Next, the manufacturing method of the cast iron control device 1 for railway vehicles which concerns on this invention is demonstrated based on FIGS.
As shown in FIG. 4, first, the back plate 2 is placed on the lower mold 16 of the mold 15 forming the cast iron brake 1 for a railway vehicle so that the outer surface 2a is on the lower side. The lower mold 16 is formed with a recess 17 along the arc shape of the back plate 2. Further, a groove 18 for forming the cotter portion 5 is formed in a portion of the lower mold 16 corresponding to the connecting ring 4 of the back plate 2.

Next, the base 19 of the guide bar 10 is passed through the hole 14 of the back plate 2, and the base 19 of the guide bar 10 is inserted into the lower mold 16.
When the guide bar 10 is inserted into the lower mold 16, a substantially T-shaped jig 21 is used as shown in FIG. The jig 21 includes a grip portion 22 and a holder 23 provided so as to be orthogonal to the grip portion 22. The holder 23 has a hole 24 for receiving the guide rod 10. The length of the hole 24 is set so as to substantially match the length L2 of the holder 23.

  Specifically, to insert the guide bar 10 into the lower mold 16 using the jig 21, first, the tip 20 of the guide bar 10 is mounted in the hole 24 of the holder 23 of the jig 21. Then, the base portion 19 of the guide rod 10 is inserted toward the hole 14 of the back plate 2, and is further inserted into the lower mold 16 through the back plate 2 and fixed. At this time, the guide rod 10 is inserted until the lower end 28 of the holder 23 of the jig 21 contacts the back plate 2. By doing in this way, the protrusion amount L1 of the guide rod 10 from the back plate 2 can be set so as to always coincide with the length L2 of the holder 23. That is, the jig 21 is not only for inserting the guide bar 10 into the lower mold 16 but also for setting the amount of protrusion of the tip 20 of the guide bar 10 from the back plate 2. The jig 21 is removed from the guide bar 10 after the guide bar 10 is inserted into the lower mold 16.

  Next, as shown in FIG. 6, the ceramic block 8 is pierced into the guide rod 10 while the hole 13 formed in the ceramic block 8 extends along the guide rod 10. The hole 13 of the ceramic block 8 has a size that allows the ceramic block 8 to slide relative to the guide rod 10. Thereafter, the upper mold 25 is placed on the lower mold 16 and clamped. The upper mold 25 is provided with a braking friction surface forming surface 26 for forming the braking friction surface 6 of the cast iron brake wheel 1 for a railway vehicle.

Then, the lower mold 16 and the upper mold 25 are clamped and the molten metal 27 is supplied to the cavity K. Then, as shown in FIG. 7, the ceramic block 8 floats along the guide rod 10 due to the specific gravity difference from the supplied molten metal 27, and a braking friction surface of the upper mold 25 is formed on one side surface of the ceramic block 8. The state comes into contact with the surface 26.
In this state, the molten metal 27 flows into the continuous air holes of the ceramic block 8, and the molten metal 27 is integrated with the ceramic block 8. And the molten iron 27 cools, and the cast iron blocker 1 for railway vehicles by which the cast iron block 3 was solidified and formed in the state which cast the back plate 2 and the ceramic block 8 is manufactured. Incidentally, the cast iron brake wheel 1 for a railway vehicle taken out from the mold 15 is in a state where the guide bar 10 protrudes toward the outer surface 2a of the back plate 2. The guide bar 10 at the protruded portion is made of scissors or the like. What is necessary is just to cut | disconnect along the outer surface 2a.

Therefore, according to the above-described embodiment, the guide bar 10 is passed through the hole 14 of the back plate 2 and inserted into the lower mold 16, so that the guide bar 10 is provided at an appropriate position with respect to the mold 15. be able to.
In addition, by inserting the ceramic block 8 into the guide rod 10, the ceramic block 8 is automatically levitated along the guide rod 10 just by supplying the molten metal 27 into the mold 15, and the braking friction of the upper mold 25. It contacts the appropriate position of the surface forming surface 26. For this reason, the ceramic block 8 can be cast at an appropriate position with respect to the cast iron control device 1 for a railway vehicle. Therefore, it is possible to easily manufacture a cast iron control device 1 for a railway vehicle having no stable product quality and stable brake performance.

  Further, since the guide bar 10 is inserted into the lower mold 16 by the jig 21, the manufacturing time can be shortened, and the amount of protrusion of the guide bar 10 from the back plate 2 can be set to an appropriate length without variation. Quality can be improved. For this reason, for example, the protruding amount of the guide rod 10 is small, the ceramic block 8 cannot be inserted into the guide rod 10, or the protruding amount of the guide rod 10 is large, and the tip 20 of the guide rod 10 is braked against the upper mold 25. There is no contact with the surface forming surface 26.

  When the ceramic block 8 is set on the back plate 2, the guide bar 10 may be inserted into the lower mold 16, for example, a work for welding a block stopper or the like for fixing the ceramic block 8 to the back plate 2. Is not necessary. For this reason, the manufacturing cost of the cast iron control wheel 1 for railway vehicles can be reduced.

The present invention is not limited to the above-described embodiment. For example, the guide bar 10 is inserted into the lower mold 16 through the hole 14 of the back plate 2, and the ceramic block 8 is slidable on the guide bar 10. Although the case where it stabbed was demonstrated, if the ceramic block 8 can be slidably installed with respect to the cavity K, it will not be restricted to these shapes.
In the above-described embodiment, for example, the ceramic block 8 has been described as being formed in a cylindrical shape. However, the ceramic block 8 is not limited to a cylindrical shape without departing from the spirit of the present invention.
In the above-described embodiment, for example, the ceramic block 8 is formed with an infinite number of continuous air holes, and the opening ratio is 85 to 94%. However, the opening ratio is limited to this. Instead, any number of continuous vent holes may be formed.

1 is a side view of a railway vehicle control device according to an embodiment of the present invention. 1 is a plan view of a railway vehicle control device according to an embodiment of the present invention. It is a perspective view of the ceramic block in the embodiment of the present invention. It is sectional drawing which shows the manufacturing process (guide rod insertion fixation) of the railway vehicle control device in embodiment of this invention. It is sectional drawing of the jig | tool in embodiment of this invention. It is sectional drawing which shows the manufacturing process (die-clamping) of the railway vehicle control device in embodiment of this invention. It is sectional drawing which shows the manufacturing process (molten metal supply) of the railway vehicle control wheel in embodiment of this invention.

Explanation of symbols

1 Cast iron control wheel for railway vehicle 2 Back plate 3 Cast iron block (control wheel body)
8 Ceramics block (braking block)
10 Guide rod 13 Hole 14 Hole 16 Lower mold 19 Base 20 Tip 21 Jig 23 Holder 25 Upper mold 26 Braking friction surface forming surface 27 Molten metal K Cavity

Claims (3)

A back plate is disposed on the lower mold side in the cavity formed by the upper mold and the lower mold, and the base of the guide bar is inserted and fixed to the lower mold through the back plate, and the tip of the guide bar is fixed. The amount of protrusion to the cavity side is ensured, and a brake block is slidably inserted into the guide rod. After mold clamping, molten metal is supplied into the cavity. A cast iron for a railway vehicle which manufactures a control body with the brake block cast in a state where one side surface of the braking block is brought into contact with the braking friction surface forming surface by floating along the guide rod to the surface forming surface. A manufacturing method of a brake,
When inserting the guide bar into the lower mold, a jig for receiving the tip of the guide bar using the protruding amount of the guide bar as a holding allowance is detachably used with respect to the guide bar. A method for producing a cast iron brake for a railway vehicle. The method for manufacturing a cast iron brake for a railway vehicle according to claim 1 , wherein the brake block is provided with a hole for loosely inserting the guide rod. The method for producing a cast iron brake for a railway vehicle according to claim 1 or 2 , wherein the braking block is made of foamed silicon carbide ceramics in which an infinite number of continuous air holes are formed. .

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