JPS5854899B2 - Manufacturing method for die-forged teeth - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing die-forged teeth that are used in excavating machines such as power shovels and the like and are made precise and durable.

Conventional free-forged teeth do not use molds, etc., and are made using technology that relies mainly on the long experience and skill of the workers, so it is not easy to replace workers, and the resulting product is uneven. Mass production is also not possible.

Furthermore, although cast steel teeth enable mass production, they lack durability.

The present invention solves the above-mentioned drawbacks, and is made by heating a special steel material cut to an appropriate length to approximately forging temperature, and then forming a conical die-cut hole with a flat bottom and expanding upward. The rough-beating die is placed in a rough-beating die consisting of a lower die with a hole formed therein and an upper die with a small convex portion substantially similar to the die-scored hole, and then a suitable number of blows are applied to form a rough-beaten product with a hole. After the punching process and the rough punched product that has been deburred are heated again to the forging temperature, the upper and lower molds each have a horizontal wedge shape with a punched hole in half of the wedge. In addition, the upper die has a convex shape of a predetermined shape formed on the shallow side of the die hole, which is approximately half of the die-cut hole, and a cone-shaped mandrel with a truncated cone is inserted into the hole of the rough die. The rough punching process in which the inserted rough punched product is inserted and struck for an appropriate number of times to form a finished punched product is avoided, and the finished punched product is then heat-treated and surface treated after removing the mandrel and deburring. To provide a method for manufacturing die-forged teeth that have good precision, strength, and wear resistance, enable mass production, reduce processing costs, are highly durable, and are extremely easy to handle. It is.

Embodiments of the present invention will be described below with reference to the drawings.

A cylindrical or prismatic material 1 made of special steel such as chromolybdenum steel and having a diameter of approximately 60 rran is cut into a predetermined length using a 200 ton press machine.

The cut material 1 is placed in a heating furnace 2 and heated to approximately 1200°C1.
Heat it up.

On the other hand, a hollow hole 3 having a flat bottom and an upwardly expanding conical shape, such as a pyramidal shape, a rounded shape, or a conical shape, is punched out at a predetermined slope 4,
A lower mold 5 whose corners and corners are appropriately rounded;
A rough punching die 8 consisting of an upper die 7 having a small convex portion 6 that is substantially similar to the shape of the punching hole 3 is formed, and this rough punching die 8
is installed in a 1'/ton forging machine.

The heated material 1 is put into the punching hole 3 of the lower mold 5 of the rough punching mold 8, the forging machine is operated, and the hole 9 is punched by the convex portion 6 of the upper mold 7 while applying a blow to the material 1. Form the outer shape.

In this manner, the rough-beating process is completed by applying an appropriate number of blows to form a rough-beating product 10, which is a semi-finished product.

When the rough-beating product 10 is taken out from the rough-beating die 8, it has burrs 11 peculiar to the die-forging process, so the burrs 11 are removed by an 80-ton press machine 12.

The rough-beaten product 10 from which the burrs 11 have been removed is again placed in the heating furnace B and heated at approximately 1200°C.

On the other hand, the wedge is shaped like a horizontal wedge, and half-cut holes 14 and 15 are formed into the upper and lower halves of the wedge, facing each other, at a predetermined punching angle, and with appropriate rounding at the corners and edges. Type 1
6 and a lower mold 17, and the upper mold 16 has a long slope on one side between the edge portions of both side surfaces having a draft angle on the shallow bottom side of approximately half of the punched hole 14. A convex portion 18 is formed by connecting the top of the surface, the curved surface, and the other short inclined surface toward the deep side of the die-cut hole 14 with appropriate rounding at the corners, the edge portion, and other continuous portions. Then, a finishing die 19 is formed by combining the upper die 16 and the lower die 17.

This finishing die 19 is installed in a 11/2 ton forging machine.

The hole 9 of the heated rough punched product 10 is concave from one end to the other end, and a pair of opposing sides 20 are connected to the other side 21.
Hexagonal pyramid mandrel 2 with the head cut at right angles to the longer axis
2 and insert this mandrel 22 with the constricted end first.

The rough punched product 10 containing the mandrel 22 is put into the die-cutting hole 15 of the lower die 17 installed in the forging machine, and the forging machine is operated to form the upper die 16.
A suitable number of blows are applied to the convex portion 18 to form a finish stamped product 23, and the finish stamping process is completed.

The finished stamped product 23 is processed to remove burrs 25 using the 80 ton press machine 24 in the same manner as described above, and then the core metal 22 of the casing is removed.
The thinner side is used as the tip 26 and the thicker side is used as the rear end 27.The side surface 28 is approximately wedge-shaped and has a bulge 29 that abuts at the same slope toward the approximately center line of the side surface 28 that is divided into upper and lower parts. The upper and lower plane shapes are approximately rectangular, and the bottom 31 extends from approximately the center to the tip of the upper plane 30.
It has a constant width so that the wall thickness is constant, the approximately central part is a curved surface, the tip is a flat surface, and both inner surfaces 32 are flat surfaces that expand upward with a draft angle. A concave portion 33 with an appropriate roundness is formed in the continuous portion, and the rear portion has a pair of opposing sides that taper inward from the rear end surface toward the tip and have a flat surface that looks like the top is cut off approximately in the center. 34 is the other side 3
A hexagonal pyramid-shaped hole 36 longer than 5 is formed with the thick shaft aligned with the center of the tip, and mounting holes 37 are formed on both side walls of this hole 36.
Formed by drilling.

Further, if necessary, the product A is constructed by subjecting it to surface treatment such as heat treatment such as hardening to achieve a predetermined hardness, shot blasting, and then painting.

Note that each of the rough punching die 8 and the finishing punching die 19 may be provided with an appropriate number of combinations of die-cut holes and convex portions of different shapes for intermediate forming.

Since the present invention is configured as described above, it has good accuracy and
It is strong and has excellent abrasion resistance, and therefore has durability several times that of conventional products.

It can be processed without special skill, it can easily replace workers, and it can significantly reduce the number of man-hours required.
In addition to lowering processing costs, productivity can be increased.

Since the cone-shaped hole 36 is provided, it is extremely easy to attach and detach when attaching to a packet, etc., and the hole 36 is shaped like a flat hexagonal pyramid with a pair of opposing sides 34 longer than the other sides 35. By forming this, it is possible to prevent rotation, eliminate looseness, and ensure positioning during installation.

Furthermore, the effect of making it easier to remove the mandrel 22 after the finish hammering process is completed can also be obtained.

By aligning the center of the tip 26 with the axis of the hole 36, it is easy to concentrate the force on the tip 26, and the recess 33
It can be used as a rake surface and as an engagement surface for crushed materials.

By going through a roughing process and a finishing process in which the striking directions are different, the flow line of the material structure can be made ideal.

Furthermore, since the draft angle 4 and the corners are appropriately rounded, the occurrence of wrinkles and cracks can be completely eliminated and the product can be made extremely strong.

The recesses 33 and the holes 36 make the mass effect uniform, and can be freely adapted to specifications by tempering such as quenching, making the entire product A uniform in hardness, and cleaning the surface by shot blasting the residue. At the same time, it is also possible to increase the hardness of the very surface layer.

Furthermore, by adding an inspection method such as the red check method or magnetic flaw detection method to the process, it is possible to discover and treat flaws that cannot be detected with the naked eye, thereby significantly improving quality.

As described above, the present invention can be applied to other similar-shaped forged parts, is uniform, has good precision, is strong, has excellent wear resistance, is highly durable, and can be mass-produced. This results in a product that reduces processing costs and is extremely easy to handle.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a plan view of the product, FIG. 2 is a sectional view taken along the z-z' arrow in FIG. 1, and FIG. 3 is a sectional view taken along Y-Y' in FIG. Arrow sectional view, Figure 4 is x-x' in Figure 1
Figures 5 to 14 are process overview diagrams; Figure 5 is the material; A is the front view; Figure 2 is the side view; Figure 2 is the front view and side view of other embodiments; 7 is a longitudinal sectional view of the heating furnace during heating of the material, FIG. 7 is a longitudinal sectional view of the rough-beating die, FIG. 8 is a longitudinal sectional view of the rough-beating product in the processing state, FIG. 9 is a side view of the rough-beating product, 1
Figure 0 is a vertical cross-sectional view of the main part of the rough punched product in the state of punching.
Figure 1 is a longitudinal cross-sectional view of the heating furnace during heating of a rough-beaten product, Figure 12 is a state in which a mandrel is inserted into a rough-beaten product, A is a side view of the rough-beaten product, the mouth is a side view of the mandrel, and C is a side view of the mandrel. A rear end view of the mandrel, FIG. 13 is a longitudinal cross-sectional view of the finish stamping die, FIG. 14 is a longitudinal cross-sectional view of the finish stamping product in the processed state, and FIG. 15 is a plan view of the finish stamping product.
FIG. 16 is a longitudinal cross-sectional view of the main part of the finished stamped product in the state of punching. A...Product, 1...Material, 2...
... Heating furnace, 3 ... Die-cut hole, 4 ...
Draft angle, 5...lower mold, 6...convex part,
7...Upper die, 8...Rough punching die, 9...
...Hole, 10...Rough hammered item, 11...
...Paris, 12...Press machine, B...
・Heating furnace, 14, 15...---Mold hole, 16...
...Top mold, 17...Bottom mold, 18...
・Convex part, 19...Finishing die, 20.21・
... Side, 22 ... Core gold, 23 ...
・Finish stamped product, 24...Press machine, 25.
...Paris, 26...Tip, 27...
...Rear end, 28...Side, 29...Bulge, 30...Flat, 31...Bottom, 32...Inner surface , 33... recess, 3
4.35... Side, 36... Hole, 37.
...hole.

Claims (1)

[Claims] 1. After heating a special steel material cut to an appropriate length to approximately the forging temperature, a lower die is formed with a conical die-cut hole whose bottom is flat and expands upward, and this die-cut hole is approximately a rough-beating step of forming a rough-beating product having a hole by placing it in a rough-beating die consisting of an upper mold having similar small convex portions and applying a suitable number of blows;
After heating the rough punched product to the forging temperature again,
It consists of an upper mold and a lower mold each having a horizontal wedge shape with a cut hole cut into half of the wedge, and the upper mold has a predetermined protrusion on the shallow bottom side of the cut hole, which is approximately half of the cut hole. A finishing step in which a rough punched product with a cone-shaped mandrel with a truncated head inserted into a hole in the rough punched product is placed in a finishing die having a section, and the rough punched product is struck for an appropriate number of times to form a finished punched product. A method for manufacturing die-forged teeth, which comprises a beating process, and further comprises removing the core metal and deburring the finished product, and subjecting the finished product to heat refining and surface treatment.