JP2001170732A - Precision columnar body and its manufacturing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a precision columnar body having a high dimensional precision and a manufacturing method to manufacture the precision columnar body without causing deterioration of working environment and waste of material. SOLUTION: Many mountains 2 of a screw shape or an annular shape are formed on the outer circumference of a columnar stock of metal 1 by form rolling, an intermediate stock 4 is made. Next, the intermediate stock 4 is subjected to form rolling or drawing, the tip of respective mountains are squeezed flat to form the precision columnar body 5 having a prescribed diameter. A metal material is caused to flow into a groove part 3, a high dimensional precision is obtained and the burden to a die is reduced as well. Further, a head part or a normal thread part may be formed at a part of the precision columnar body 5. The obtained precision columnar body is of a light weight and has a high dimensional precision.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a precision metal column having a highly accurate outer diameter and a method of manufacturing the same.

[0002]

2. Description of the Related Art A precision cylinder made of metal having a highly accurate outer diameter is obtained by cutting the outer periphery of a metal material using a lathe.
It is usually manufactured by polishing. According to this method, a high dimensional accuracy of about 0.01 mm can be obtained. However, this method has a problem that a lot of time is required for the steps of cutting and polishing, and the processing cost is increased. In addition, the working environment is degraded due to the generation of chips, and metal materials with a diameter larger than the target outer diameter are cut.
Since polishing is required, there is a problem that a large amount of material is wasted.

[0003] In addition, there is known a method of manufacturing a precision cylinder by drawing a metal material with a die. This method can shorten the processing time and reduce the cost as compared with the above-mentioned cutting / polishing processing method. However, when the squeezed metal material comes out of the die, it expands in the radial direction due to the springback phenomenon, so that the dimensional accuracy is inevitably lower than that of the cutting / polishing method. Further, since a large processing load is applied to the die, there is a problem that the life of the die is shortened.

[0004]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems and provides a precision cylindrical body having the same dimensional accuracy as that obtained by the cutting / polishing method. The purpose of the present invention is to provide a technology that can be manufactured at low cost without applying a large processing load to a die such as a die without using a die.

[0005]

Means for Solving the Problems A precision cylindrical body according to the present invention made to solve the above-mentioned problem has a screw-like shape which is flattened on the outer periphery of a metal cylindrical material so that the tip has a predetermined diameter. Alternatively, a number of ring-shaped peaks are provided in the circumferential direction. Further, the method for producing a precision cylindrical body of the present invention comprises forming a number of screw-shaped or ring-shaped ridges in the circumferential direction by rolling on the outer periphery of a metal cylindrical material, and further rolling or drawing the intermediate material. It is characterized in that a precision columnar body having a predetermined diameter is formed by processing and flattening the tip of each of the above-mentioned peaks. The rolling or drawing of the intermediate material may be performed on a part of the intermediate material in the axial direction.

According to the method for manufacturing a precision cylinder of the present invention,
First, in order to form a large number of screw-shaped or ring-shaped ridges in the circumferential direction on the outer periphery of the columnar material by rolling, the extra space at the time of subsequent rolling or drawing is formed by the groove between these ridges. The precision cylinder having high dimensional accuracy can be manufactured while avoiding the springback phenomenon. In addition, since the excess thickness can be easily released, a large processing load is not applied to a die such as a die. In addition, since cutting and polishing are not required, a good working environment can be maintained without generating chips, and the material can be raised by rolling, so that a thin metal material can be used, and There is no waste. Further, the precision cylindrical body of the present invention has an advantage that it has high dimensional accuracy and can be reduced in weight. Hereinafter, preferred embodiments of the present invention will be described.

[0007]

(First Embodiment) FIG. 1 is a diagram showing a first embodiment of the present invention. First, a cylindrical metal material 1 is prepared, and a number of screw-shaped ridges 2 are formed in the circumferential direction on the outer periphery thereof by rolling using a rolling die. As the type of the column material 1, various metals such as stainless steel, copper, and aluminum can be used in addition to steel. The cross-sectional shape of the tip of the ridge 2 is preferably the same as a normal thread. The cylindrical material 1
The metal material in the groove 3 is pressed and swells to form the peak 2, so that the outer diameter of the obtained intermediate material 4 is larger than the outer diameter of the first cylindrical material 1. In addition, since it is a rolling process, no chips are generated.

Next, the intermediate material 4 in which a number of thread-shaped peaks 2 are formed in the circumferential direction is further rolled or drawn to flatten the tip of each peak 2 at a position of a predetermined diameter, and It is a precision cylindrical body 5 having a diameter. During this processing, the metal material at the tip of the crushed mountain 2 easily flows into the groove 3, so that the springback phenomenon unlike the conventional case does not occur. Therefore, it is possible to easily obtain a precision cylindrical body 5 having a desired outer diameter, and to achieve the dimensional accuracy of 0.01 mm as in the cutting / polishing method.
Degree.

Due to the flow of the metal material, the tip of the peak 2 spreads in the axial direction as shown in the figure, and the opening width of the groove 3 is reduced by that amount, so that the sectional area of the groove 3 is reduced. Since this step is also a rolling process or a drawing process, there is no generation of chips and no waste of material. Also, the flow of the metal material reduces the processing load on a die such as a die, and the service life of the die can be prolonged.

[0010] The precision cylinder 5 thus obtained is
Since a large number of screw-shaped ridges 2 crushed flat so that the tip has a predetermined diameter are provided in the circumferential direction, the weight can be reduced and the dimensional accuracy of the outer diameter can be increased. It is suitable for use as shafts and positioning pins of various precision machines. Since the precision cylindrical body 5 has the thread-shaped groove 3 formed on the outer peripheral surface thereof, FIG.
Can be used as a means for dropping the liquid little by little from the container 10 as shown in FIG. In this case, by utilizing the fact that the cross-sectional area of the groove 3 is smaller than that of a normal screw, the amount of liquid dripping can be suppressed, and flow rate control in a small flow rate range becomes easy. Although FIG. 3 shows an example of the precision cylindrical body 5 in which the head 11 is integrally provided, it can be said that such a head 11 can be easily formed by using a normal bolt rolling method. Not even.

(Second Embodiment) FIG. 2 is a diagram showing a second embodiment of the present invention. In the second embodiment, a number of ring-shaped peaks 2 are formed in the circumferential direction on the outer periphery of a metal cylindrical material 1 by rolling using a rolling die. These ridges 2 may have the same cross-sectional shape as a normal thread except that they are not spiral. It is preferable that the width of the ridge 2 and the width of the groove 3 are substantially the same.

As in the first embodiment, the intermediate material 4
Further, the tip of each crest 2 is flattened at a position of a predetermined diameter by rolling or drawing to form a precision cylindrical body 5 having a predetermined diameter. The dimensional accuracy of the outer diameter of the obtained precision cylindrical body 5 also becomes extremely high. In addition, since there is no generation of chips, there is no deterioration of the working environment, and since there is no need to use the cylindrical material 1 having a diameter larger than the target diameter, there is no waste of the material, the weight can be reduced, and the die can be reduced. This is similar to the first embodiment in that it can be manufactured at low cost without applying a large processing load to a mold such as. The precision cylindrical body 5 of the second embodiment is also suitable for use as shafts, positioning pins, etc. of various precision machines utilizing high dimensional accuracy.

As shown in FIG. 4, a normal screw portion 12 is rolled on a part of the columnar material 1 and a number of screw-shaped or ring-shaped ridges 2 according to the present invention are formed on the other part in the circumferential direction. It is also possible to perform drawing on only the portion of the crest 2. In this case, since the normal screw portion 12 and the thread 2 can be simultaneously rolled, if the thread portion 12 is drawn as a positive (reference) and the portion of the thread 2 is drawn, the thread portion 12 and the precision columnar portion can be formed. Coaxiality increases. Therefore, if this precision cylindrical body 5 is attached to the member 13 using the screw portion 12 and used as a centering bolt or the like, excellent centering accuracy can be obtained.

[0014]

As described above, according to the method for manufacturing a precision cylinder of the present invention, a precision cylinder having excellent dimensional accuracy equivalent to that obtained by the cutting / polishing method can be produced at low cost. be able to. Further, unlike the cutting / polishing method, there is an advantage that the working environment is not deteriorated and the material is not wasted, and a large processing load is not applied to a die such as a die. Further, the precision cylindrical body of the present invention is advantageous in that it is lightweight and has high outer diameter dimensional accuracy.

[Brief description of the drawings]

FIG. 1 is a process explanatory view showing a first embodiment of the present invention.

FIG. 2 is a process explanatory view showing a second embodiment of the present invention.

FIG. 3 is a sectional view showing a usage example.

FIG. 4 is a sectional view showing another example of use.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Metal cylinder material 2 Mountain 3 Groove part 4 Intermediate material 5 Precision cylindrical body 10 Container 11 Head 12 Normal screw part 13 Member

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Asakura 1-8-8 Takahashi, Oguchi-machi, Niwa-gun, Aichi Prefecture Inside the Oguchi Plant of Aoyama Seisakusho Co., Ltd. (72) Inventor Katsuaki Yokoi 1-8-8 Takahashi, Oguchi-machi, Niwa-gun, Aichi Prefecture Address: Inside the Oguchi Plant of Aoyama Manufacturing Co., Ltd.

Claims (3)

[Claims] 1. A precision columnar body having a plurality of thread-shaped or ring-shaped peaks crushed flat so that a tip thereof has a predetermined diameter in a circumferential direction on an outer periphery of a metal columnar material. . 2. A plurality of thread-shaped or ring-shaped ridges are formed in a circumferential direction on the outer periphery of a metal cylindrical material by rolling, and the intermediate material is further roll-formed or drawn to form each of the ridges. A precision cylinder having a predetermined diameter by flattening a tip of the cylinder. 3. The method according to claim 1, wherein rolling or drawing of the intermediate material is performed on a part of the intermediate material in the axial direction.