JP2006263868A - Manufacturing device and method of screw point and screw point - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a manufacturing device and method of a screw point producing high-quality products at high economic efficiency compared with manufacturing methods by casting and forging. <P>SOLUTION: This manufacturing method of the screw point comprising a cutting means 2 cutting by rotating a cutting blade, a vertically moving means 3, a uniformly moving means 4 and a rotating means 5 is characterized in forming a spiral groove on a rod by simultaneously executing three processes: a process A of equally dividing the circumferential face of the rod 1 at 90° to form a cutting start point and rotating the rod around the axis at a constant speed; a process B of relatively moving the cutting blade of the cutting means, which is abutted on the cutting start point of the rod circumferential face, in the axial direction of the rod; and a process C relatively moving the cutting blade of the cutting means, which is abutted on the cutting start point of the rod circumferential face, perpendicularly to the axial direction of the rod. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an apparatus and a method for manufacturing a screw point used in a Swedish sounding test (JIS standard: JIS A 1221) for conducting ground surveys at the time of building a structure or building a residential land.

The Swedish sounding test is a test that conducts ground surveys such as soil quality and earth strength using two types of test methods: loading of weights and rotational penetration. It has been implemented.
In the above test method, a screw point having a shape like a twisted quadrangular pyramid is attached to the tip of the rod, and it is vertically pushed and supported on the ground. Observe and record whether the rod sinks downward each time a weight of 25, 50, 75, 100 kg is placed in order.
If the rod remains stationary with a 100kg weight, rotate the handle to force the rod to penetrate while digging the soil with the screw point at the tip, and penetrate the rod 25cm. Record the number of half revolutions of the handle. When the penetration to the specified depth has been recorded, the measurement is terminated and the rod is withdrawn.

As described above, the screw point is worn by contact with earth and sand during penetration, so that it is required to have a certain hardness and good economic efficiency for repeated use.
Conventional screw points are generally manufactured by casting or forging because they can be mechanically mass-produced once a mold is manufactured.
Japanese Patent Laid-Open No. 10-280377

  However, when the screw point with a thin shaft diameter was manufactured by casting, the completed screw point was brittle, it was severely worn by contact with earth and sand etc. at the time of penetration, and it was easy to break when the rod penetrated or pulled out, There was a problem that it could not be used repeatedly and was not economical.

  In addition, in the manufacturing method by casting or forging, there is a problem that an error is likely to occur in the shape of the screw point, and there are many defective products due to the inspection after the manufacturing, so that there is a problem that the economy is poor.

Accordingly, an object of the present invention is to provide a screw point that is higher in quality and more economical than a conventional screw point manufacturing method, a manufacturing apparatus thereof, and a manufacturing method thereof.

  In order to solve the problems as described above, the first invention of the present application is arranged perpendicularly to the axial direction of the rod, and cutting means for cutting by rotating the cutting blade, and the cutting means with respect to the axial direction of the rod A vertical moving means that moves relative to the vertical direction; a constant speed moving means that moves the rod relative to the cutting direction relative to the cutting means; and a rotating means that rotates the rod relative to the cutting means relative to the axis. The present invention provides a screw point manufacturing apparatus.

  The second invention of the present application provides the screw point manufacturing apparatus according to the first invention of the present application, characterized in that the cutting means and the vertical movement means are provided at positions facing each other across the rod. It is.

  The third invention of the present application provides the screw point manufacturing apparatus according to the first or second invention of the present invention, wherein a groove milling cutter or an end mill cutter is used as a cutting edge of the cutting means. It is.

  The fourth invention of the present application provides a cutting start point at a position obtained by equally dividing the peripheral surface of the rod at intervals of 90 degrees, and the step of rotating the rod around the axis at a constant speed and the cutting start point of the rod peripheral surface A step in which the abutted cutting blade relatively moves in the axial direction of the rod, and a step in which the cutting blade abutted on the cutting start point of the rod circumferential surface relatively moves in the direction perpendicular to the axial direction of the rod. A screw point is produced by forming four spiral grooves by forming four spiral grooves on the rod by performing two processes simultaneously and repeating the above process four times while changing the cutting start point. A method is provided.

  Further, the fifth invention of the present application provides a cutting start point at a position where the circumferential surface of the rod is equally divided at intervals of 90 degrees, the step of rotating the rod around the axis at a constant speed, and two opposing rod circumferential surfaces. The two cutting blades abutted against the cutting start point move relatively in the axial direction of the rod, and the two cutting blades abutted against the two cutting start points facing each other on the rod circumferential surface The process of moving in the vertical direction and the three processes are simultaneously performed to form two spiral grooves on the rod, and four spirals are formed by repeating the above process twice while changing the opposing cutting start points. The present invention provides a method for manufacturing a screw point, characterized by forming a groove.

  The sixth invention of the present application provides a screw point manufacturing method, wherein two cutting blade groups according to the fifth invention of the present application are provided to form four spiral grooves simultaneously. It is.

  Further, the seventh invention of the present application provides a cutting start point at a position where the circumferential surface of the rod is equally divided at 90 ° intervals, the step of rotating the rod around the axis at a constant speed, and the cutting start point of the rod circumferential surface. A step in which the abutted cutting blade relatively moves in the axial direction of the rod, and a step in which the cutting blade abutted on the cutting start point of the rod circumferential surface relatively moves in the direction perpendicular to the axial direction of the rod. A screw point is provided, characterized by forming one spiral groove on the rod by performing two steps at the same time, and repeating the above steps four times by changing the cutting start point to form four spiral grooves To do.

  The eighth invention of the present application also includes a step of rotating the rod around the axis at a constant speed after the circumferential surface of the rod is equally divided at 90 ° intervals to provide a cutting start point, and the opposing 2 of the rod circumferential surface. The two cutting blades that are in contact with the two cutting start points move relative to each other in the axial direction of the rod, and the two cutting blades that are in contact with the two cutting start points on the rod peripheral surface that are opposed to each other in the axial direction of the rod The two steps are simultaneously performed to form two spiral grooves on the rod, and the above process is repeated twice with the opposite cutting start point being changed. The screw point is characterized by forming a spiral groove.

A ninth invention of the present application is characterized in that two screw blade groups described in the screw point manufacturing method according to the fifth invention of the present application are provided, and four spiral grooves are formed simultaneously. Provide points.

The present invention can obtain at least one of the following effects by means for solving the above-described problems.
<1> Compared with the manufacturing method by casting, the accuracy of the product is high and the occurrence frequency of defective products is low.
<2> Compared with the manufacturing method by casting, the strength of the product is high and the tip of the screw point is less damaged, so that it can be used repeatedly in Swedish sounding tests and is highly economical.
<3> By providing a plurality of cutting means and a plurality of vertical movement means, a plurality of spiral grooves formed on the rod peripheral surface can be formed simultaneously, and a screw point can be manufactured quickly.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the embodiment shown below, the rod 1 serving as a screw point member is cut using the screw point manufacturing apparatus according to the present invention to manufacture the screw point 10 shown in the exploded perspective view of FIG. .

<1> Overall Configuration FIG. 1 shows an embodiment of the present invention.
The screw point manufacturing apparatus in the present embodiment is arranged perpendicular to the axial direction of the rod 1, the cutting means 2 for cutting by rotating the cutting blade, and the cutting means relatively moved in the vertical direction with respect to the axial direction of the rod. A vertical moving means 3 that moves, a constant speed moving means 4 in which the rod moves in the axial direction relative to the cutting means, and a rotating means 5 in which the rod rotates relative to the cutting means relative to the axis. Become. The structure of each means will be described below.

<2> Cutting means 2
As shown in FIGS. 4 and 5, a groove milling cutter 21 and an end mill cutter 22 having a cutting edge surface on the bottom surface and outer peripheral surface are used for the cutting blade of the cutting means 2.
Further, the cutting is performed by rotating the cutting blade at a high speed by the motor 23.
Since the screw point is shaped like a square pyramid, the cutting width of the cutting means 2 is configured to be equal to the length of one side of a regular square whose diagonal is the maximum shaft diameter of the screw point.

<3> Vertical moving means 3, constant speed moving means 4, rotating means 5
In FIG. 2, the process of the manufacturing apparatus of this invention is shown. For the vertical moving means 3, a known feeding mechanism (not shown) such as a motor is used so that the cutting depth of the cutting means 2 can be adjusted and the feeding direction of the cutting means 2 is orthogonal to the axial direction of the rod 1. Alternatively, as shown in FIG. 3, a rail inclined by a predetermined angle from the axial direction of the rod 1 may be used, and cutting may be performed by sliding the cutting means along the rail.
The constant velocity moving means 4 uses a known feed mechanism (not shown) so that the rod 1 can move in the axial direction. Similarly, a known rotating mechanism (not shown) is also used for the rotating means 5 so that the rod 1 can rotate around the axis.
Necessary setting values such as the movement amount and rotation speed of the above-described known feeding mechanism and rotating mechanism may be controlled by programming in advance by a computer.

<4> Cutting Step In the manufacturing method in the present embodiment, first, in order to form four spiral grooves at the screw point, the peripheral surface of the rod 1 is equally divided at intervals of 90 degrees to provide four cutting start points. .
Next, the rod 1 is attached and fixed to a well-known fixing means such as a chuck 51 included in the rotating means 5 so that the rod 1 does not come off due to cutting work or rotational movement of the rod. Thereafter, the cutting blade of the cutting means 2 is rotated, and the cutting means 2 is positioned by the vertical moving means 3 and the constant velocity moving means 4 so that the cutting edge of the cutting means 2 is in contact with the cutting start point of the rod 1. Start cutting.
Next, a step of rotating the rod 1 around the axis at a constant speed by the rotating unit 5 (hereinafter referred to as a rotating step A), and a step of moving the cutting unit 2 in the axial direction of the rod by the constant velocity moving unit 4 (hereinafter, etc.) By simultaneously performing three steps consisting of a fast moving step B) and a step of moving the cutting means 2 in a direction perpendicular to the axial direction of the rod by the vertical moving means 3 (hereinafter referred to as a vertical moving step C), One spiral groove is formed on the outer peripheral surface of the rod 1.
By repeating the above three steps while changing the cutting start point, a screw point having four spiral grooves is formed.

6 and 7 show another embodiment of the manufacturing apparatus according to the present invention. In the manufacturing apparatus according to the present embodiment, two cutting means arranged perpendicular to the axial direction of the rod are provided at positions facing the rod 1.
By providing the cutting means at a position facing the rod 1, two spiral grooves can be formed at the same time without the cutting blades interfering with each other.
Therefore, the working time can be further reduced by half compared to the first embodiment.

FIG. 8 shows another embodiment of the manufacturing apparatus according to the present invention. The manufacturing apparatus according to the present embodiment is provided with two cutting means 2 arranged perpendicular to the axial direction of the rod at positions opposite to the rod 1, and when the rotating means 5 rotates 90 degrees, the remaining cutting Since two similar cutting means 2 are arranged at a position where the cutting edge comes into contact with the starting point, four spiral grooves can be formed simultaneously without the cutting blade group interfering with each other.
Therefore, the working time can be shortened to a quarter compared to the first embodiment, and the cost can be further reduced.

  FIG. 9 shows another embodiment of the manufacturing apparatus according to the present invention. The rotation of the rod 1 itself can be made unnecessary by rotating the circular frame 6 to which the cutting means 2 is fixed by the rotation means 5 as in the manufacturing apparatus according to the present embodiment.

The screw point manufacturing apparatus shown in the above-described embodiment can have various embodiments depending on the number of cutting means 2, the method of relative movement between the rod 1 and the cutting means 2, and the like. By determining factors such as the work area and the required number of production, it can be carried out in an optimal manner as appropriate.

Detailed drawing of the manufacturing apparatus of Example 1 of this invention. The figure which shows the process of the manufacturing apparatus of Example 1 of this invention. The figure which shows the other Example of the vertical movement means of this invention. The figure which shows the cutting state of Example 1 of this invention. The figure which shows the other Example of the cutting means in FIG. The detail drawing of the manufacturing apparatus of Example 2 of this invention. The figure which shows the cutting state in Example 2 of this invention. Detailed drawing of the manufacturing apparatus of Example 3 of this invention. The detail drawing of the manufacturing apparatus of Example 4 of this invention. The exploded perspective view of a screw point.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Rod 10 ... Screw point 2 ... Cutting means 21 ... Groove milling cutter 22 ... End mill cutter 3 ... Vertical moving means 4 ... Constant velocity moving means 5 ... Rotating means 51 ... Chuck 6 ... Frame 7 ... Table A ... Rotation process B ... Constant speed movement process C ... Vertical movement process

Claims (9)

Cutting means arranged perpendicular to the axial direction of the rod and rotating the cutting blade to cut,
A vertical moving means in which the cutting means moves relative to the direction perpendicular to the axial direction of the rod;
Constant velocity moving means in which the rod moves relative to the cutting means in the axial direction; and
A rotating means in which the rod rotates relative to the cutting means relative to the axis;
An apparatus for producing screw points, comprising:
The screw point manufacturing apparatus according to claim 1, wherein the cutting means and the vertical movement means are provided at positions facing each other with the rod interposed therebetween.
The screw point manufacturing apparatus according to claim 1 or 2, wherein a groove milling cutter or an end mill cutter is used as a cutting blade of the cutting means.
A cutting start point is provided at a position obtained by equally dividing the circumferential surface of the rod at intervals of 90 degrees.
The rod rotates around the axis at a constant speed;
A step in which the cutting blade abutted on the cutting start point of the rod peripheral surface relatively moves in the axial direction of the rod;
A step in which the cutting blade abutted against the cutting start point of the rod peripheral surface moves in a direction perpendicular to the axial direction of the rod;
The three steps consisting of
A screw point manufacturing method, wherein four spiral grooves are formed by repeating the above process four times while changing a cutting start point.
A cutting start point is provided at a position obtained by equally dividing the circumferential surface of the rod at intervals of 90 degrees.
The rod rotates around the axis at a constant speed;
A step in which two cutting blades that abut against two opposing cutting start points on the rod peripheral surface move in the axial direction of the rod;
A step in which two cutting blades that abut against two opposing cutting start points on the rod peripheral surface move in a direction perpendicular to the axial direction of the rod;
Two spiral grooves are formed on the rod by simultaneously performing the three steps consisting of
A screw point manufacturing method, wherein four spiral grooves are formed by repeating the above process twice by changing the opposing cutting start point.
A screw point manufacturing method, wherein two cutting blade groups according to the screw point manufacturing method according to claim 5 are provided, and four spiral grooves are formed simultaneously.
A cutting start point is provided at a position obtained by equally dividing the circumferential surface of the rod at intervals of 90 degrees.
The rod rotates around the axis at a constant speed;
A step in which the cutting blade abutted on the cutting start point of the rod peripheral surface relatively moves in the axial direction of the rod;
A step in which the cutting blade abutted against the cutting start point of the rod peripheral surface moves in a direction perpendicular to the axial direction of the rod;
The three steps consisting of
A screw point, wherein four spiral grooves are formed by repeating the above process four times while changing the cutting start point.
After providing the cutting start point by equally dividing the circumferential surface of the rod at intervals of 90 degrees,
The rod rotates around the axis at a constant speed;
A step in which two cutting blades that abut against two opposing cutting start points on the rod peripheral surface move in the axial direction of the rod;
A step in which two cutting blades that abut against two opposing cutting start points on the rod peripheral surface move in a direction perpendicular to the axial direction of the rod;
Two spiral grooves are formed on the rod by simultaneously performing the three steps consisting of
A screw point, wherein four spiral grooves are formed by repeating the above process twice by changing the opposing cutting start point.
A screw point, wherein two cutting blade groups according to the method for producing a screw point according to claim 5 are provided to form four spiral grooves simultaneously.

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