JPH08243738A - Screw shaft and production of screw shaft - Google Patents

Abstract

PURPOSE: To obtain a light and long square thread shaft or trapezoidal screw thread shaft and to provide the production method thereof. CONSTITUTION: A member 5 (screw thread member) having a square thread shape or trapezoidal screw thread shape is wound on the external surface of a tube 1 (screw shaft base material) to be a main body part of a square thread shaft or trapezoidal screw thread shaft, and an assembly shaped screw shaft is formed with the arc welding, the laser beam welding, the resistance welding, brazing, bonding or combination of them. This production adopts a device to apply the rotation and the feed onto the screw shaft base material 1 at the same time by rotating a female screw 29 while linking with a sleeve 23 by a motor 20 through a gear being arranged inside a carrier housing 18 while a female screw 29 is engaged with a master screw shaft 17 fixed on the bed, rolls 41 to 44 to circularly bend the screw thread member 5 and to feed it on the screw shaft base material 1, a positional regulation gage 50 of the screw thread member 5, a positioning tool 51 of the screw shaft base material 1, and a welding machine to weld and fix the screw shaft base material 1 and the screw thread member 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a square screw shaft or a trapezoidal screw shaft used in a machine and a manufacturing method thereof.

[0002]

2. Description of the Related Art A square screw shaft or a trapezoidal screw shaft made of ferrous or non-ferrous metal is integrally made by cutting a bar material with a thread cutting machine. As another method, there is also a screw shaft made by rolling a bar material.

As a second method, there is an example in which a threaded member is welded to the outer surface of a steel rod or steel pipe in a part of a civil engineering machine to form a screw shaft-shaped component.

[0004]

However, according to the first method described above, although it is possible to make a highly accurate screw shaft for machining, when making a long screw shaft, a large-sized screw cutting equipment is required. Since it is necessary, there is a problem that the cost becomes high. Further, it is difficult to process the pipe material by the rolling method. Since both methods use a bar, there is a drawback that the material cost is higher than that of a pipe. Since the long screw shaft becomes heavy, it was inconvenient to carry and assemble manually. We have not established any technology that can inexpensively supply light and long square screw shafts for medium and light loads.

In the second method, there is an example in which a long screw shaft is formed by a welded structure and is used as a tool for a hole excavator on the ground, but since it is difficult to obtain screw accuracy, the original screw is combined with a female screw. There was a problem to use it as an axis. In view of such conventional problems, an object of the present invention is to provide a screw shaft structure and a manufacturing method thereof which can efficiently manufacture a long rectangular screw shaft or a trapezoidal screw shaft for medium / light loads at low cost. Especially.

[0006]

[Means for Solving the Problems]

 [Detailed Description of the Invention]

[0007]

In order to achieve the above-mentioned object, the screw shaft structure of the present invention has a pipe (referred to as a screw shaft base material) which is a main body portion of the screw shaft, and L having a square screw or trapezoidal screw shape. It is characterized in that it is composed of two members, that is, a shape member or a T-shaped member (referred to as a thread member). The thread member uses a material made by drawing or extruding.

In the screw shaft of the present invention, a thread member is wound around the outer surface of the screw shaft base material, and these two members are integrally fixed by arc welding, laser beam welding, resistance welding, brazing, bonding or a combination thereof.

[0009]

The function of the square screw or trapezoidal screw shaft according to the present invention is
Since a pipe material is used for the screw shaft base material and a thread member is wound around it, the weight can be greatly reduced. Further, since it is made by assembling two members, it can be manufactured at a lower cost than an ordinary screw shaft made by cutting a thread from a bar material.

Further, according to the present invention, a long screw shaft, which has been difficult to manufacture by the conventional technique, can be easily manufactured without using a large machine tool.

Further, in the screw shaft structure of the present invention, since the force entering the screw thread portion is supported by both the screw thread member and the screw shaft base material, stress concentration is higher than that of the assembled screw shaft made by winding the square rod around the pipe material. And an efficient and compact screw shaft can be designed.

Since the screw shaft of the present invention has a structure in which the force applied to the screw thread is received by both the screw thread member and the screw shaft base material, the length of the welded portion and the welding method are optimized according to the strength required for the screw shaft. Can be selected. As a result, the welding strain of the screw thread can be suppressed to a minimum and it can be manufactured at low cost.

Since the constituent member of the screw shaft is divided into two parts, that is, the screw shaft base material and the screw thread member, the material, dimension and shape, heat treatment and fixing method of the member can be appropriately selected, so that the optimum structure is obtained. be able to. For example, a cheap and high-performance screw shaft can be made by using stainless steel or brass having high durability as the screw thread member and steel pipe as the screw shaft base material and fixing the two members by laser beam welding.

In the screw shaft using the T-shaped screw thread member, the portion to be fixed by welding is located between the screw threads and is welded at a position apart from the screw thread portion, so that when the screw thread is loaded, a screw is applied. Since the mountain member is easily elastically deformed in the length direction of the screw shaft, the local contact at the time of fitting with the female screw is relaxed by this elastic deformation, and the pressure applied to the thread is leveled.
As a result of this flexible structure, the local contact with the internal thread due to welding distortion is automatically adjusted, stress concentration is avoided, and damage is less likely to occur. For this reason, finishing machining of the thread portion is unnecessary, and an inexpensive screw shaft can be manufactured. Also, since the weld fixing part is in the middle of the screw thread, the welding protrusion can be recessed in the middle part of the thread of the female screw to escape, and the welding protrusion fits with the female screw as when welding near the screw thread. There is an advantage that the problem that the effective thread size is reduced can be avoided.

Since the screw shaft of the present invention is composed of two members, the screw shaft composed of three members (Japanese Patent Application No. 14213).
Compared with 0), there are advantages that the number of welded points can be reduced, and as a result, a screw shaft with less welding distortion and low cost can be manufactured.

[0016]

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

FIG. 1 is a reference diagram showing an ordinary square screw, and FIG. 2 is a reference diagram showing a screw shaft (Japanese Patent Application No. 142130) constituted by three members. In FIG. 1, A is a normal square screw, in FIG. 2, reference numeral 1 is a screw shaft base material, 2 is a thread material, 3 is a thread support material,
Reference numeral 4 is a welded portion for fixing the three members.

FIG. 3 is an explanatory view for explaining the structure of the two-member assembly type screw shaft of the present invention. In FIG. 3, reference numeral 1 is a screw shaft base material, 5 is a screw thread member, and 4 is a welded portion for fixing the screw thread member and the screw shaft base material. The thread member 4 is spirally adhered and wound around the outer surface of the screw shaft base material 1, and the screw shaft base material and the thread member are welded and fixed continuously or intermittently at the joint between the screw thread members. It is a two-member assembly screw shaft that is made. The fixing method is arc welding, laser beam welding, resistance welding, brazing, bonding or a combination thereof.

FIG. 4 is an explanatory view for explaining the shapes of constituent members of the screw shaft of the present invention. In FIG. 4, reference numeral 1 is a screw shaft base material,
5-1 is an L-shaped screw shaft member, and 5-2 is a T-shaped screw shaft member. Reference numeral 6 is a notch for facilitating welding, 7
Is a slit for the same purpose.

FIG. 5 is an explanatory view for explaining the cross-sectional shape of the thread member. In FIG. 5, 5-1 is an L-shaped screw shaft member,
5-2 indicates a T-shaped screw shaft member. The left figure shows the basic shape of the square screw, the center figure shows the shape for the square screw with the welding groove, and the right figure shows the shape for the trapezoidal screw with the welding groove.

FIG. 6 is an explanatory view for explaining how to support the force applied to the assembly type screw shaft of the present invention. In FIG. 6, the left diagram shows the screw shaft of the present invention, and the right diagram shows a general assembled screw shaft. In the screw shaft of the present invention, since the thread member and the thread member are joined and fixed by welding, the force P applied to the thread is P in the thread member, but after the welding fixing portion, the thread member is P ₁ , Is a screw shaft base material and is jointly supported by P ₂ and both members. P = P ₁ + P ₂ . On the other hand, in an assembled screw shaft in which a square rod is wound around a pipe, the force P applied to the screw is entirely supported by the pipe material. Since all the input P is supported by the welded portion and transmitted to the pipe material, the welded portion is liable to crack. In the screw shaft of the present invention, since the screw thread members are in close contact with each other, the force is dispersed and the input of the welded portion between the screw thread member and the screw shaft base material becomes small, so the stress generated at the welded portion is relieved and it becomes difficult to fracture. .

FIG. 7 is an explanatory view for explaining the relaxation of the stress due to the elastic deformation of the thread. The above figure shows that when a force P is applied to the screw thread of the screw shaft of the present invention, the screw thread member is elastically deformed and the bending δ is generated. The figure on the right side shows the case where the screw thread is not flat and there are irregularities, and the female screw locally contacts at the convex portion where the force P is received. When the force P is applied, the screw thread is bent δ, so that the unevenness of the screw thread becomes flat as shown by the dotted line, and the engagement with the female screw approaches from a local contact to a uniform contact, so the maximum stress value of the welded part is suppressed. It The figure below shows the structure that is fixed to the pipe material by welding at the root of the thread. Since there is almost no elastic deformation of the thread portion, the local contact with the female thread is not relaxed, so that the stress value of the welded portion becomes high and there is a drawback that it is easily broken.

FIG. 8 is an explanatory view for explaining the fit between the assembled screw shaft and the female screw. The left figure shows the fit between the assembled screw shaft using the T-shaped thread member 5-2 of the present invention and the female screw 12-1. When the T-shaped screw thread member 5-2 is used, the welding fixing portion 4-1 is located in the middle of the screw thread, so that the interference with the welding projection is dented in the screw thread intermediate portion of the female screw.
It can be escaped by attaching -1 and does not adversely affect the thread engagement. The figure on the right shows a normal screw shaft in which a square rod is wrapped around a pipe, and in order to escape the welded portion 4-2 at the root of the screw thread, it is necessary to provide a welding protrusion relief 13-2 on the female thread 12-2, and it fits into the female thread. It shows that there is a problem that the effective thread size is reduced.

FIG. 9 is an explanatory view for explaining the screw shaft using the L-shaped thread member. In FIG. 9, reference numeral 1 is a screw shaft base material, 5
-1 is an L-shaped thread member, and 4 is a welded portion. FIG. 10: is explanatory drawing explaining the welding part of the screw shaft which uses a L-shaped thread member. In FIG. 10, reference numeral 8 is a joint portion of the thread member, and 9
Indicates a welded portion obtained by continuously arc welding the jointed portion. Reference numeral 6 indicates a cutout portion of the thread member, and 9-1 indicates a welded portion obtained by arc welding the cutout portion. Reference numeral 7 indicates a slit portion of the thread member, and 9-2 indicates a weld portion obtained by arc welding the slit portion.

FIG. 11 is an explanatory view for explaining the welded portion of the screw shaft using the L-shaped thread member. In FIG. 11, reference numeral 9 indicates a continuous arc welded portion of the thread member joint portion, and 10 indicates a spot welded (resistance welded) welded portion. Reference numeral 11 indicates a seam welded (resistance welded) welded portion, and 9-3 indicates an intermittent arc welded portion.

FIG. 12 is an explanatory view for explaining a screw shaft using a T-shaped thread member. In FIG. 12, reference numeral 1 is a screw shaft base material, 5-2 is a T-shaped thread member, and 9 is a welded portion. FIG. 13 is an explanatory diagram illustrating a welded portion of a screw shaft using a T-shaped thread member. In FIG. 13, reference numeral 8-1 indicates a joint portion of the thread member, 9-4 indicates a weld portion obtained by continuously arc welding the joint portion, and 11 indicates a weld portion formed by seam welding. Reference numeral 6-1 indicates a cutout portion of the thread member, and 9-5 indicates a welded portion obtained by arc welding the cutout portion. Reference numeral 7-1 indicates a slit portion of the thread member, and reference numeral 9-6 indicates a welded portion obtained by arc welding the slit portion.

14 to 22 are explanatory views for explaining an embodiment of the screw shaft manufacturing method of the present invention. FIG. 14 is an explanatory diagram illustrating the structure of the screw shaft manufacturing apparatus of the present invention. 14
In the figure, reference numeral 15 denotes a bed of a screw shaft manufacturing apparatus, on which a master screw shaft 17 is fixedly supported at both ends by a stand 16. Reference numeral 18 denotes a carrier, and the screw shaft base material 1 is fixed to a sleeve 23, which is a component of the carrier, by a holder 19, and the motor 20 causes the sleeve 23 to be connected to the sleeve 23 via a gear.
Since the female screw 29 fitted in the master screw shaft 17 is rotated, rotation and feed are simultaneously applied to the screw shaft base material 1. Reference numeral 39 is a tool table on which the bending roller housing 40 and rolls 41, 42, 43, 44 are mounted. The screw shaft base material 1 is arranged above the bending roller. Reference numerals 5, 2 and 3 are materials wound around the screw shaft base material, and in the case of an assembled screw shaft having a two-member configuration, the thread member 5 (L-shaped member 5-1 or T-shaped member 5-2), In the case of a three-member assembled screw shaft, the thread member 2 and the thread support member 3 are used. Reference numeral 50 is a gauge for preventing variations in the thread pitch of the assembled screw shaft, and the dimensions are regulated by this gauge when the material is formed by a bending roller and wound around the screw shaft base material. This gauge also has the function of ironing square screw shapes. Reference numeral 55 denotes a welding torch of the welding machine, which is fixed to the screw shaft base material by welding in a process after the wound member is dimensionally regulated by a gauge. As the welding machine, an arc welding machine, a laser beam welding machine, or a resistance welding machine is used. Reference numerals 52 and 53 are stands that support the screw shaft.

FIG. 15 is an explanatory view for explaining the structure of the bending roller. In the figure, reference numeral 40 is a housing of a bending roller, and reference numerals 41, 42 and 43 are bending rolls, which bend the thread member 5 into a circle. Reference numeral 44 is a presser roll, which presses the screw thread member 5 together with the roll 42.
-1, 44-2 parts are rotationally driven and the screw thread member 5 is supplied to the screw shaft base material 1. The roll 43 is a roll necessary when setting the screw thread member 5 on the screw shaft base material 1, and after the screw thread member 5 is welded and fixed to the screw shaft base material 1 as shown by the arrow A, the screw thread member 5 is formed. May be separated from. Reference numeral 50 is a gauge, and 51 is a positioning tool for the screw shaft base material. In order to wind the thread member in close contact with the screw shaft base material 1 without slack, the axis of the roll 42 with respect to the axis of the screw shaft base material 1 is θ ₁ degree in the vertical direction (direction of arrow A) and the horizontal direction ( It is necessary to incline by ₂ degrees in the direction of arrow B). These angles are determined by the specifications of the screw shaft to be manufactured (the outer diameter dimension of the base material and the width of the thread member).

FIG. 16 is an explanatory view for explaining the contact portion between the roll and the screw thread member. In FIG. 16, reference numeral 42 is a bending roll, reference numeral 44 is a pressing roll, and 5 is a thread member.
In the case of the three-member assembled screw shaft, the thread member 5 and the thread support member 3 replace the thread member 2. 42-1
Reference numeral 44-1 is a roll rotation drive unit to which a drive motor is connected.

17, 18 and 19 are overhead views for explaining the structure of the bending roller. In the figure, reference numeral 40-1 is a housing, and the angle θ ₁ and the angle θ ₂ can be adjusted by housing the housing 40 and using a bolt. Code 4
1, 42, 43 and 44 are rolls. Reference numeral 50 is a gauge, and 51 is a positioning tool for the screw shaft base material.

Next, the structure of a device for simultaneously applying rotation and feed to the screw shaft base material will be described. FIG. 20 is an explanatory diagram illustrating the structure of the carrier portion. In FIG. 20, the gear 21 of the drive motor 20 mounted on the side wall of the carrier housing 18 rotates the gear 22 having the sleeve 23 at the center, and the gear 22 is integrated with the female screw 29 that fits in the center at the master screw shaft 17. Gear 2
Rotate 8. As a result, the sleeve 23 rotates and the female screw 29 also rotates, so that the carrier is guided along the master screw shaft by the slide ways 34 and 35 on the upper part of the bed 15 and fed. Therefore, rotation and feed are simultaneously given to the screw shaft base material 1 fixed to the sleeve. When the number of teeth of the gear 22 and the gear 28 is the same and the master screw shaft is left-handed, the screw shaft base material is provided with right screw feed at the same pitch as the master screw shaft. Gear 22 and gear 2
If the number of teeth of 8 is changed, the screw pitch of the master screw shaft can be increased or decreased to feed the screw shaft base material.

FIG. 21 is an explanatory view for explaining the structure of a carrier whose feed pitch can be changed. In FIG. 21, reference numeral 18
Is a carrier housing that slides on the bed 15, 2
Reference numeral 0 is a drive motor, and 21 is a gear (pinion) fixed to the motor shaft. The pinion is a gear 2 that connects a sleeve 23 that fixes the screw shaft base material 1 to the center portion.
Rotate 2. The gear 22 has a key (26) on a shaft 25 whose central axis can move at an equal distance from the rotation center of the gear 22.
The gear 24 fixed by is rotated. Shaft 25
Next to the gear 24 is the gear 27 (27-1 or 27-
2) is also fixed with a key and makes the same rotation.
The gear 27 (27-1 or 27-2) rotates the gear 28 that connects the female screw 29 fitted in the master screw shaft 17 at the center portion. As a result, the sleeve 23
Since the female screw 29 rotates, the carrier is fed along the master screw shaft by the slide 33 guided by the slide ways 34 and 35 above the bed 15. Therefore, rotation and feed are simultaneously given to the screw shaft base material 1 fixed to the sleeve. In order to feed the screw shaft base material 1 by increasing or decreasing the feed pitch of the master screw shaft 17, the number of teeth of the gear 27 may be changed and the shaft 25 may be rotationally slid and fixed at the position where the gears mesh with each other. The gear 27-1 shows an example of pitch expansion and the gear 27-2 shows an example of pitch reduction. Gear 27 is gear 24
When the number of teeth is the same, the same feed pitch as the master screw shaft can be obtained. For example, the number of teeth of the gears 22 and 28 is 112, the number of teeth of the gear 24 is 56, and the feed pitch of the master screw is 28 m.
m, the number of teeth of the gear 27 is 72, 64, 56, 4
When changed to 8, 40, the feed pitch of the screw shaft base material becomes 36, 32, 28, 24, 20 mm, respectively.

FIG. 22 is an explanatory view for explaining the internal structure of the carrier. In FIG. 22, reference numerals 18-1 and 18-2
Is a carrier housing with sleeve 23, shaft 25,
A female screw 29 is contained via a bearing 30. The carrier housing 18-1 mounts the drive motor 20, and the carrier housing 18-2 has an opening lid 31 for replacing the gear 27. 32 is a shaft 25
Is a cover with a positioning pin 36 for fixing the to the housing. Reference numeral 21 is a pinion, 22 is a sleeve 23
Gears that are fastened with, 23 is a sleeve for screw shaft rotation,
24 is an intermediate gear, 25 is a shaft, 26 is a key,
Reference numeral 27 is a gear for changing the feed pitch, and 28 is a gear fastened to a female screw. Reference numeral 1 is a screw shaft base material, 19, 19-
Reference numeral 1 is a fixture for fixing the screw shaft base material 1 to the sleeve 23. Reference numeral 33 is a slide of the carrier housing.

[0034]

As is apparent from the above description, according to the screw shaft structure and the screw shaft manufacturing method of the present invention, the screw shaft is light and has a long angle for assembling the screw shaft base material 1 and the thread member 5. The screw or trapezoidal screw shaft can be manufactured at low cost. INDUSTRIAL APPLICABILITY The screw shaft of the present invention does not have to machine a thread from a bar material, can produce a screw shaft in a short time without producing chips, and can reduce material costs and processing costs. It can be manufactured at lower cost than In addition, it is possible to easily manufacture long rectangular screw shafts and trapezoidal screw shafts that are difficult to manufacture due to the size restrictions of equipment in machining. Further, since the screw shaft has a divided structure, it is possible to optimally select the material, size, shape, heat treatment and fixing method according to the characteristics required for the screw, and it is possible to design efficiently structurally. As a result, it becomes possible to manufacture at low cost and in a short period of time. The screw shaft of the present invention is most suitable for the medium and long screw shaft fields to be used with a light load, and can be widely used in elevators for personal houses, stair lifts, multilevel parking lifts, etc. large.

[Brief description of drawings]

FIG. 1 is a reference diagram showing a normal square screw shape.

2 is a screw shaft composed of three members (Japanese Patent Application No. 1421).
Fig. 30)

FIG. 3 is an explanatory view illustrating a structure of a two-member assembly type screw shaft.

FIG. 4 is an explanatory view for explaining the shapes of the constituent members of the screw shaft.

FIG. 5 is an explanatory diagram illustrating a cross-sectional shape of a thread member.

FIG. 6 is an explanatory view for explaining how to support a force applied to the assembly type screw shaft.

FIG. 7 is an explanatory diagram illustrating relaxation of stress due to elastic deformation of threads.

FIG. 8 is an explanatory view for explaining a fit between the assembled screw shaft and the female screw.

FIG. 9 is an explanatory view illustrating a screw shaft using an L-shaped thread member.

FIG. 10 is an explanatory diagram illustrating a welded portion of a screw shaft using an L-shaped thread member.

FIG. 11 is an explanatory diagram illustrating a welded portion of a screw shaft using an L-shaped thread member.

FIG. 12 is an explanatory view illustrating a screw shaft using a T-shaped thread member.

FIG. 13 is an explanatory view illustrating a welded portion of a screw shaft using a T-shaped thread member.

FIG. 14 is an explanatory diagram illustrating a structure of a screw shaft manufacturing apparatus.

FIG. 15 is an explanatory diagram illustrating a structure of a bending roller.

FIG. 16 is an explanatory diagram illustrating a contact portion between a roll and a thread member.

FIG. 17 is an overhead view illustrating the structure of a bending roller

FIG. 18 is an overhead view illustrating the structure of the bending roller.

FIG. 19 is an overhead view illustrating the structure of a bending roller.

FIG. 20 is an explanatory diagram illustrating a structure of a carrier portion.

FIG. 21 is an explanatory view illustrating the structure of a carrier whose feed pitch can be changed.

FIG. 22 is an explanatory diagram illustrating the internal structure of the carrier.

[Explanation of symbols]

A Ordinary square screw 1 Screw shaft base material 2 Screw thread material 3 Screw thread support material 4, 4-1, 4-2 Welded portion 5, 5-1, 5-2 Screw thread member 6 Screw thread member notch 7 Screw Slit 8 of mountain member Joints 9, 9-1, 9-2, 9-3, 9-4, 9-5, 9-6
Arc welding part 10 Spot welding 11 Seam welding 12-1, 12-2 Female screw 13-1, 13-2 Female screw relief part 15 Bed 16 Stand 17 Master screw shaft 18, 18-1, 18-2 Carrier, Carrier housing 19, 19-1 Stopper 20 Drive motor 21 Gear (pinion) 22, 24, 27, 27-1, 27-2, 28 Gear 23 Sleeve 25 Shaft 26 Key 29 Female screw 30 Bush (bearing) 31 Removal window 32 Lid 33 Slide 34 , 35 Slide way 36 Positioning pin 39 Tool stand 40, 41-1 Housing 41, 42, 43 Roller 42-1, 44-1 Roller drive shaft part 44 Holding roller 50 Gauge 51 Positioning tool 52, 53 Stand 55 Welding torch (welding) Machine)

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masao Okubo 3-9-20 Teranochu, Ayase City, Kanagawa Prefecture (72) Inventor Kazuko Okubo 3-9-20 Teranochu, Ayase City, Kanagawa Prefecture (72) Shin Okubo 3-9-20 Teraochu, Ayase City, Kanagawa Prefecture (72) Inventor Gen Okubo 3-9-20 Teranochu, Ayase City, Kanagawa Prefecture

Claims (3)

[Claims] 1. An L-shaped member or a T-shaped member (called a thread member) having a square screw or a trapezoidal screw shape is spirally formed on the outer surface of a pipe (called a screw shaft base material) which is a main body of a screw shaft. Closely wound in a circular shape, and the arc shaft, laser beam welding, or part of the screw length, or the entire length of the screw shaft base material and the thread member at or near the joint between the thread members.
An assembled type screw shaft characterized by being fixed by resistance welding, brazing, adhesion or a combination thereof. 2. An L-shaped member or a T-shaped member (screw thread member) having a square screw or trapezoidal screw shape is formed into a circle by a bending roll, and the circular screw thread is arranged with being inclined with respect to the screw shaft base material. The end of the member is welded to the outer surface of the screw shaft base material or fixed to the screw shaft base material with a fastener, etc., and one end of the screw shaft base material is fixed with a sleeve to obtain the specified screw lead angle and screw pitch. As shown in the figure, the screw shaft base material is rotated and fed at the same time so that the screw thread member is closely wound around the screw shaft base material to form a square screw shaft or a trapezoidal screw shaft. Is fixed by arc welding, laser beam welding, resistance welding, brazing, gluing or a combination thereof. 3. A gear is fastened to the outside of a female screw that fits with a master screw shaft fixed to the upper part of the bed, and the gear and the gear fastened at the outer circumference of the screw shaft base material fixing sleeve are directly or intermediately geared. Mesh through one of these gears and place them inside one housing.
A screw shaft base material feed device that can move the housing along the master screw shaft on the bed slideway by rotating one of them with a drive motor to give rotation and feed to the screw shaft base material fixed to the sleeve. And a thread roll member (or thread material and thread support material) that is bent and fed to the screw shaft base material that has been rotated and fed by the above-mentioned device, and the bent thread A gauge and a positioning tool that regulate the position of the member (or thread material and thread support material) so that it can be accurately wound on the screw shaft base material, and the wound thread member (or thread material and thread support material). An apparatus for manufacturing an assembled screw shaft comprising two members (or three members), characterized by comprising a welding device for fixing the screw shaft base material.