JPH0715650Y2 - Spherical body forming device for pipe with cutting burr - Google Patents

Description

TECHNICAL FIELD The present invention relates to a spherical body forming device for a pipe material with cut burr which can form a pipe material having a burr by cutting with a disc cutter into a desired spherical body.

2. Description of the Related Art Conventionally, as a device used for molding a spherical body part such as a constant velocity joint cage, there is a spherical body molding device for molding a pipe material cut into an appropriate length into a spherical body. Generally, saw cutting and disk cutter cutting are used as means for cutting the length of pipe. In the case of saw cutting, the yield is poor because a cutting allowance that becomes cutting chips is required,
Therefore, in forming a spherical body, a disc cutter is used which has a good yield, although it has a drawback that the cut pipe material has a burr. Further, since the pipe material cannot be molded with the burr attached, the burr is removed to remove the burr, and then the pipe material is subjected to a spherical body molding device to form a desired spherical body.

Therefore, the outline of the forming section of the conventional spherical body forming apparatus will be described with reference to FIGS. 6 to 9. A forming die 01 provided with a chamfered guide section 8 ′ and a spherical die section 9 and a forming die 01. A positioning die 10 whose tip end sometimes enters the hollow portion of the pipe material 7'for positioning, and a lower knockout ring 12 attached to the positioning die 10 via a spring 14.
And a forming punch 04 provided with a spherical mold portion 9 following a chamfered guide portion 8 ′ similar to the forming die 01, and as shown in the left side of FIG. The pipe material 7 ′ (see FIG. 9) thus formed is supported by the guide portion 8 ′ of the forming die 01 and the upper end surface of the lower knockout ring 12 which is floated by the spring 14, and the forming punch 04 is used from above. The forming force was given by pressing.

Both ends of the pipe material 7 ′ that has received the forming force have a forming die.
01 and the guide portion 8'of the forming punch 04 slide into the mold portion 9, and at this time, the lower knockout ring 12 is also pushed by the pipe material 7'which receives the forming force and moves downward while contracting the spring 14. Then, the tip end of the positioning die 10 enters into the hollow portion of the pipe material 7'and prevents buckling inward and performs positioning. Further, by pressing the forming punch 04, as shown in the right side of FIG. 6, the pipe material 7'is pressed against the mold portion 9 to complete the forming. The finished pipe material 7'was released from the knock pin 17 by pushing up the knock pin spacer 18 so that the knock pin 17 pushed up the lower knock out ring 12 and finished by turning.

Problems to be Solved by the Invention According to the spherical body forming apparatus of the conventional example described above, when a pipe material produced by cutting a disc cutter and having a burr attached is formed, the pipe material is uneven due to the presence of uneven burr. Since the fitting to the molding die is bad and the mold portion is spherical, it is difficult to rotate the pipe material when the molding force is applied to mold it into a normal spherical body. For this reason, in the past, the burr was removed by adding the step of removing the burr, and the forming process was performed after this.However, since the turning process is performed after the forming process, the processing man-hour increases and the cost increases. Was disadvantageous.

Means for Solving the Problems The present invention is to solve the above-mentioned problems, and forms a spherical material by molding a pipe material which is burred by cutting by applying a forming force to a forming punch and a forming die. In the apparatus, a positioning die and a positioning punch whose tip portion is inserted into the hollow portion of the pipe material for positioning, and a pair of upper and lower knockouts for sandwiching and supporting the pipe material by a spring force attached to the positioning die and the positioning punch. A molding punch and a molding die, each of which has a ring, a guide portion that is inserted into the knockout ring and chamfered in two steps, and a spherical mold portion that follows the center portion, and centripes the pipe material during molding to form the pipe material. An apparatus for forming a spherical body of a pipe member with a cutting burr, comprising: a pipe member with a cutting burr that can be molded without inclining.

Operation According to the above-mentioned means, the positioning die and the positioning punch position the pipe material with the cutting burr, and the pair of upper and lower knockout rings sandwiches both ends of the pipe material horizontally by the force of the spring, and at the same time, The forming force is applied to the pipe material with cutting burr by pressing the forming punch and the forming die. Both ends of the barbed pipe material that received the forming force are smoothly guided to the spherical mold part from the guide part that has been chamfered in two steps and has a better seating, and is centered along the spherical mold part. . Therefore, the pipe member with cut and burr can be formed into a desired spherical shape by the forming punch and the forming die.

EXAMPLE An example of a spherical body forming apparatus for a pipe material with a cutting burr according to the present invention will be described with reference to FIGS. 1 to 5. The forming die formed by fixing the lower insert die 2 to the die holder 1 with the bolts 3 and the forming punch formed by attaching the upper insert die 5 to the punch holder 4 with the bolts 6 are pressed against each other to press the pipe material 7 It is a member for applying a molding force to the material to mold it into a desired spherical body. In the lower insert mold 2 and the upper insert mold 5, as shown in FIG. 4, a spherical mold part 9 is formed following a guide part 8 chamfered in two steps such as angles θ ₁ and θ _2. Has been done. Further, a cylindrical positioning die 10 for fixing the tip portion of the pipe member 7 into the hollow portion of the pipe member 7 is fixed to the die holder 1, and similarly, the punch holder 4 is also provided.
Also, the positioning punch 11 is fixed. Furthermore, a lower knockout ring 12 is provided on the flange portion 10a of the positioning die 10 so as to surround the positioning die 10 and the positioning punch 11, and a flange portion of the positioning punch 11 is provided.
11a has upper knockout ring 13 and spring 14
It is installed in a floating state. The knockout ring, which moves up and down according to the expansion and contraction of the spring 14, has a configuration in which the molding punch and the upper and lower insert molds of the molding die are fitted and inserted on the outer periphery thereof.

The guide ring 15 and the die ring 16 are core misalignment preventing members capable of moving in the vertical direction. The guide ring 15 and the die ring 16 are fixed to the punch holder 4 and the die holder 1, respectively. Knock pin spacer
Reference numeral 18 is a member for releasing the molded pipe material 7.

According to the apparatus for forming a spherical body of pipe material with a cutting burr described above, as shown in FIG. 3, first, the pipe material 7 with the cutting burr 7a attached is chamfered in two steps so that the lower insert has a better fit. It is arranged and supported by the guide portion 8 of the mold 2 and the upper end surface of the lower knockout ring 11, and then the forming punch is lowered as shown on the left side of FIG. At this time, the end surfaces of the lower knockout ring 12 and the upper knockout ring 13 that are floated by the spring 14 pinch the pipe material 7 by the spring force and keep it horizontal, and when the forming punch is further pushed down from this state, the pipe material is pushed down. The lower knockout ring 12 holding the 7 is pushed down and at the same time the upper knockout ring 13 is pushed up. By this holding, the pipe material 7
Without being rotated, the cutting burr 7a at both ends of the pipe material 7 is smoothly guided to the spherical mold portion 9 from the guide portion 8 chamfered in two steps. When the molding punch is pushed in and a molding force is applied, the tips of the positioning die 10 and the positioning punch 11 are inserted into the hollow portion of the pipe member 7 for positioning and prevent buckling inward. Then, the pipe member 7 bulges outward and the spherical mold portion 9 is formed.
A spherical body is formed as shown in the right side of FIG.

After completion of the molding, as shown in FIG. 2, the knock pin 17 is pushed up by the knock pin spacer 18 so that the lower knockout ring 12 is pushed up by the knock pin 17 to release the molded pipe material 7. As shown in FIG. 5, the burr 7a remains on the pipe material 7 thus formed. However, during turning, which is carried out as a finishing process with or without burr, cutting burr
The trace of 7a is also removed at the same time to become a completed part.

In addition, the above-described technology of the present invention makes the forming die and the forming punch into an integrated die in comparison with the generally used insert die in order to reduce the die cost and facilitate the replacement of the portion having a short die life. It goes without saying that even if it is done, it is applicable.

Effect of the Invention According to the spherical body forming device for pipe material with cutting and burr of the present invention described above, cutting is performed with a disc cutter having a good yield,
It becomes possible to form the pipe material with the cutting burr attached as it is into a spherical body. Therefore, it is possible to reduce the steps of the burr removal process and, at the same time, to remove the burr traces during the turning process after molding, which contributes to the improvement of productivity and cost reduction.

[Brief description of drawings]

FIG. 1 is an embodiment of the present invention. A left half of the center line is before molding and a right half of the center line is during molding, and FIG. 2 is a cross sectional view showing during releasing of FIG. 3 is a sectional view showing a state in which a pipe material with a cutting burr is set in the apparatus, FIG. 4 is an enlarged sectional view of the lower insert mold of FIG. 1, and FIG. 5 is a cutting burr after completion of molding. FIG. 6 is a cross-sectional view showing a pipe material, FIG. 6 is a cross-sectional view showing an outline of a forming portion of a conventional spherical body forming apparatus, FIG. 7 is an enlarged view of a portion VII of FIG. 6, and FIG. The sectional view shown in FIG. 9 is a sectional view showing the pipe material after the burr removal processing. 1 ... Die holder, 2 ... Lower insert type, 4 ... Punch holder, 5 ... Upper insert type, 7 ... Pipe material, 8 ... Guide part, 9 ... Mold part, 10 ... Positioning die , 11 …… Positioning punch, 10a, 11a …… Flange part, 12 …… Lower knockout ring, 13 …… Upper knockout ring, 14 …… Spring.

Claims (1)

[Scope of utility model registration request] 1. In a spherical body forming apparatus for forming a pipe material, which is burred by cutting by applying a forming force to a forming punch and a forming die, into a spherical body, a tip portion is inserted into a hollow portion of the pipe material for positioning. A positioning die and a positioning punch, a pair of upper and lower knockout rings that sandwich and support the pipe material with a spring force attached to the positioning die and the positioning punch, and chamfered into two steps fitted into the knockout ring. It has a guide part and a spherical mold part that follows it, and is equipped with a forming punch and forming die that centripes and forms the pipe material at the time of forming, and it is possible to form a pipe material with a cutting burr without tilting. An apparatus for forming a spherical body of a pipe material with a cutting burr, characterized in that