JPH0124586B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for continuously processing tubes of different diameters whose inner surfaces are partially thinned and which constitute an automobile frame.

Conventionally, manufacturing this type of pipe with different diameters required many complicated processing steps, and each step required independent mechanical equipment and workers, and the transfer of materials (workpieces) also required manpower. The process requires a large amount of time, and requires a high level of skill from the operator in order to maintain high quality, resulting in a significantly high cost of the product.

Therefore, the present invention aims to solve these problems and streamline the process.Specifically, the present invention includes a hopper that accumulates a large number of works, and a first hopper that takes out works one by one from the hopper.
a transfer; a processing device that performs a tip drawing process on one end of the workpiece on the first transfer; and a processing device that enters the workpiece from the rear end side of the workpiece and steps the workpiece while passing the workpiece tip through a die. A first tube drawing device for performing processing, a workpiece receiving part for receiving the step-processed workpiece, and a part for entering the workpiece from the rear end side of the workpiece on the workpiece receiving part, and passing the leading end of the workpiece through a die. a second tube stretching device that performs circular elongation while rounding, a chute that receives the circularly elongated workpiece, a second transfer device that sends the workpiece on the chute to the cutting device, and a second tube stretching device that An end parting device that cuts, a first conveyor that clamps and transfers a workpiece with both ends processed, an R-cut press that press-cuts both ends of the workpiece on the first conveyor, and a workpiece after the R-cut press. a second conveyor that transfers the workpiece to the next process; a position detection device that automatically detects the R-cut position of the workpiece; a milling head that precisely processes both end surfaces of the workpiece on the second conveyor; It is an object of the present invention to provide a continuous processing apparatus for different diameter pipes for automobile frames, which has a hopper and a hopper for receiving workpieces passed through two conveyors.

The specific contents of the present invention will be explained below based on the illustrated embodiments. 1 is a hopper, 2 is a hopper;
is the first transfer, 3 is the processing device, 4 is the first
A tube drawing device, 6 is a die, 7 is a work receiving part, 9 is a second tube drawing device, 10 is a die, 11 is a chute,
12 is a counter transfer device, 13 is a second transfer, 14 and 15 are end cutting devices, 18 is a first conveyor, 19, 20, and 22 are R cut presses, 2
1 is a reversing device, 25 is a second conveyor, 26 is a position detection device, 27 and 28 are milling heads, 2
9 indicates a hopper.

The hopper 1 has a sloped floor that gradually becomes lower toward the first transfer 2, and a large number of automobile frame pipe materials (works) (see Fig. 2a) are placed on the hopper 1. The work P is taken out one by one by the 1 transfer 2 and sequentially transferred in the direction of the 1 tube drawing device 4.

Processing devices 3 and 3' having cylinders 3a are located at both ends of the workpiece P on the first transfer 2, and one end of the workpiece P is drawn into a tapered shape _P1 (see Fig. 2b). .

The first transfer 2 has a workpiece receiving part 5 at its advancing end point, and the workpiece P, which has been subjected to the tip drawing process, is placed in the extending direction of the core bar 4a of the first tube drawing device 4, that is, between the die 6 and the core. Move it so that it is located on the same axis as the gold 4a. With respect to the aligned workpiece P, the first tube stretching device 4 is operated to advance the core bar 4a into the workpiece from the rear end side of the workpiece P, and while passing the tip of the workpiece P through the die 6. To form a partial thin wall part on a workpiece.

The chute 7 has a sloped floor surface that gradually becomes lower in the same direction as the hopper 1 described above from the position where the workpiece P that has passed through the die 6 is received, and a part of the chute 7 has a workpiece receiving part 8 that can be raised and lowered. The workpiece P is transferred to the second tube drawing device 9 by the workpiece receiving portion 8.
The core bar 9a is moved so as to be positioned on the same axis that connects the die 10 and the core bar 9a. For the aligned workpiece P, the second
Operate the tube drawing device 9 and move the core bar 9a to the workpiece P.
The work P is entered from the rear end side, and while passing the tip of the work P through the die 10, the first
Together with the processing by the tube drawing device 4, a partial thin wall portion _P2 is formed in the workpiece (see FIG. 2c).

The chute 11 has an inclined floor surface that gradually becomes lower toward the reverse transfer loading device 12 from the position where the workpiece P that has passed through the die 10 is received. fork 1
2a, the fork 12a is shown in the figure.
Rotate 90 degrees clockwise to change the direction of the workpiece P.
This is transferred onto the second transfer 13.

Two pairs of end parting devices 14, 14' and 15, 15' are provided on the left and right sides of the second transfer 13, and one workpiece P is transferred to the second transfer 1.
In the process of being moved by
5' (see Figure 2d).

A chute 16 stores the works P transferred from the second transfer 13 and sequentially transfers them one by one onto the first conveyor 18 by the conveyor transfer device 17.

R cut presses 19, 20, and 22 are sequentially installed on both the left and right sides of the first conveyor 18, and
A reversing device 21 is disposed between the cut presses 20 and 22, so that after a part of one end of the workpiece is press cut by the R cut press 19, the other end is cut by the R cut press 20. A part is press-cut, and then the reversing device 21
The work P is reversed by 180 degrees and the above-mentioned both end processed parts (press cut parts) are repositioned so that they are symmetrical, and processed _P3 so that they become symmetrical by the final R cut press 22 (Fig. 2). e
reference).

23 indicates a chute for receiving and accumulating the workpieces P that have passed through the first conveyor 18,
The works P accumulated on the chute are sequentially placed on the second conveyor 25 by the conveyor transfer device 24 one by one.

The second conveyor 25 has means for fixing the work P (not shown), and is intermittently moved while the work P is placed and fixed.

The position detection device 26 is a notch detection device at the end of the workpiece P, and is used to process both ends of the workpiece _P3.
This is to hold the fixed position of the workpiece P.

Milling heads 27 and 28 are arranged next to the above-mentioned position detection device 26 on both sides of the second conveyor 25, and these milling heads 27 and 28 are used to precisely cut both ends of the workpiece P and form the pipe mating surface _P4 .
(See Figure 2 f).

The workpiece P formed by the milling heads 27 and 28 falls from the second conveyor 25 and is accumulated in the hopper 29, thereby completing a series of continuous processing steps for different diameter tubes.

Since the present invention is as described above, when manufacturing partially thin-walled pipes of different diameters constituting a bicycle frame, materials of equal diameter are simply fed to the hopper 1, and the pipes are transferred to the transfer and conveyor. Since tubes with different diameters with partially thinner walls are automatically produced via a feeding device, there is no need to install various processing devices individually or to assign dedicated workers as required in the past. High-quality pipes with different diameters can be mass-produced with just one person monitoring the entire process, and this has various beneficial effects such as shortening work time, improving work efficiency, achieving product homogeneity, and lowering costs. It is something to play.

[Brief explanation of drawings]

FIG. 1 is a plan view showing the entire apparatus for continuous processing of different diameter tubes for automobile frames according to the present invention, and FIG. 2 is an explanatory diagram showing the processing order of different diameter tubes for bicycle frames. 1...Hopper, 2...First transfer,
3...Processing device, 4...First tube drawing device, 6...Dice, 7...Work receiving part, 9...Second tube drawing device, 10...Dice, 11...Chute, 12...
...Anti-transfer device, 13...Second transfer,
14, 15... End parting device, 18... First conveyor, 19, 20, 22... R cut press,
21... Reversing device, 25... Second conveyor, 2
6... Position detection device, 27, 28... Milling head, 29... Hopper.

[Claims]

1. In a method of thread-forming a part of a crankshaft etc. that requires carburizing and quenching by rolling, a preliminary step of machining the processed part of the shaft to a diameter equal to or larger than the lower diameter of the rolling and the estimated carburized layer thickness; A step of carburizing and quenching the shaft, a step of grinding or cutting the carburized layer of the processed part and processing the processed part to the rolled lower diameter, and rolling the processed part after the grinding or cutting to form a thread. 1. A method for machining a screw for a crankshaft, etc., comprising the step of machining.