KR20010061075A - A head stock of the machining center - Google Patents

Abstract

PURPOSE: A headstock of a machine tool is provided to completely attach an outer surface of a spindle with an inner surface of a fixed holder for maintaining precision in process and for preventing eccentricity of the spindle. CONSTITUTION: A fixed holder(1) contains inner surfaces in a diamond shape while containing upper and lower housings(11,13). A spindle(2) is inserted to the inner surfaces while having a diamond shaped outer surface(21). Upper and lower support pieces(4,5) are installed between inner surfaces of the fixed holder and the outer surface of the spindle for supporting upper center and lower sides of the spindle. Force toward lower side of the spindle is supported by the lower support piece while force in process is supported by the upper support piece. Thus, the spindle is firmly attached to the fixed holder not to generate eccentricity of the spindle.

Description

Headstock of machine tool {A head stock of the machining center}

The present invention relates to a headstock of a horizontal machine tool, and more specifically, by closely contacting between the outer surface of the spindle and the inner surface of the fixed holder through a plurality of support pieces, to prevent the precision from being degraded during processing. In addition, the present invention relates to a headstock of a machine tool which prevents the spindle from being eccentric due to the spindle's own load.

In general, the Machining Center (hereinafter referred to as the "Machine Tool") is equipped with an automatic tool changer to exchange various types of tools to perform a wide range of machining on lathes, milling, drilling and boring machines. As a machine tool to be performed, it is divided into a vertical machining center in which the main shaft is mounted vertically and a horizontal machining center in which the main shaft is mounted horizontally.

Thus, as shown in FIG. 4, the main shaft 200 mounted on the machine tool is connected to a rotating shaft of a servo motor (not shown) and moved to the center of the spindle fixing holder 201 and the fixing holder 201. It consists of a spindle 202 to be mounted and an arbor 203 mounted to the front of the spindle 202.

In particular, Figure 5 is a cross-sectional view taken along the line AA of Figure 4, showing a state in which the spindle 202 is mounted on the fixed holder 201 constituting the main shaft, the spindle 202 is a circular cross section (see Figure 5a) What is formed is divided into those formed into square sections (see Fig. 5b).

However, in the case of mounting the spindle head on which the spindle 202 formed of the circular cross section and the square cross section is mounted on the horizontal machine tool, the downward force is generated due to the weight of the spindle 202, thereby causing the spindle ( 202, while the lower part of the outer surface is in close contact with the lower part of the inner surface formed in the fixing holder 201, on the contrary, the upper and side portions of the outer surface of the spindle 202 are separated from the inner surface of the fixing holder 201 to make a fine space ( By forming S), as the center of the spindle 202 is finely eccentric, machining has a problem in that machining accuracy is lowered.

In addition, when the machine tool is used for a long time, as the inner surface formed on the fixed holder 201 is worn out unevenly, the roundness of the inner surface is changed, thereby reducing the life of the main shaft.

On the other hand, in the case of mounting the spindle head on which the spindle 202 formed of the circular cross section and the square cross section is mounted in the vertical machine tool, formed between the outer surface of the spindle 202 and the inner surface of the fixed holder 201 Due to the fine space (S), there was also a problem that the spindle is slightly shaken during processing.

The present invention has been invented to solve the above conventional problems, by forming a spindle in a rhombic shape to support a portion that receives the force from the spindle through surface contact, between the outer surface of the spindle and the inner surface of the fixed holder; It is an object of the present invention to provide a headstock of a machine tool, which can prevent the formation of minute spaces and prevent the precision from being degraded during processing.

In addition, the outer surface of the spindle and the inner surface of the fixed holder to contact with each other through the support piece as described above, there is also an object to prevent shaking due to the cutting load received by the spindle during machining.

In addition, between the outer surface of the spindle and the inner surface of the fixed holder by inserting a support piece that can be inserted, removable, there is also an object to enable the main shaft to be used for a long time.

The present invention for achieving the above object is a fixed holder formed of an inner surface having a rhombus shape and formed of upper and lower housings, a spindle inserted into the inner surface and having an outer surface of a rhombus shape, and the fixed holder. It is characterized in that the upper and lower support pieces are mounted between the inner surface of the spindle and the outer surface of the spindle to support both the upper center and the lower side of the spindle.

1 is a perspective view showing a headstock of the present invention.

Figure 2 is a front view showing the headstock of the present invention.

Figure 3 is a side view showing the headstock of the present invention.

4 is a schematic view showing a conventional headstock.

5 is a cross-sectional view taken along the line A-A of FIG.

Explanation of symbols for main parts of the drawings

1: fixed holder

11: first housing

12: inner side

121: inclined surface, 122: vertical surface, 123: horizontal groove portion, 122a: tab hole

13: 2nd housing

14: inner side

141: inclined plane, 142: vertical plane, 143: horizontal plane,

15: intermediate bushing

2: spindle

21: outer side

211: upper inclined plane, 212: upper horizontal plane, 213: lower inclined plane,

214: lower horizontal plane

3: arbor

4: upper support piece

41: digging groove

5: lower support piece

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a main shaft of the present invention, Figure 2 is a front view, Figure 3 is a side view, when explaining the configuration as follows.

A fixed holder (1) connected to an X-axis servomotor (not shown), the upper and lower housings (11, 13) having inner surfaces (12, 14) having a rhombus shape integrally assembled;

A spindle (2) inserted into the inner surfaces (12, 14), the front of which is equipped with an arbor (3) on which a tool is mounted, and whose outer surface (21) has a rhombus shape;

Upper and lower support pieces 4, which are mounted between the inner surface 12, 14 of the fixing holder 1 and the outer surface 21 of the spindle 2 to fix both the upper center and the lower side of the spindle 2; It is characterized by consisting of 5).

In particular, the fixing holder (1) is composed of upper and lower housings (11, 13), the middle of the upper and lower housings (11, 13) in the middle of the plate-shaped middle bushing so as to closely contact the spindle (2) 15 is mounted.

An inclined surface 121 is formed at both sides of the upper housing 11 to be symmetrical to both sides, and a horizontal groove 123 is formed at an upper portion where the inclined surface 121 meets so that the upper support piece 4 can be inserted therein. The vertical surface 122 is formed at the end of the inclined surface 121. And, immediately above the horizontal groove 123, the tab hole (123a) is formed to fix the upper support piece (4).

An inclined surface 141 is formed on both sides of the lower housing 13 to be symmetrical, and a lower surface where the inclined surface 141 meets is formed with a horizontal surface 143, and a vertical surface is formed at an end of the inclined surface 141. 142 is formed.

The upper and lower inclined surfaces 211 and 213 may be inserted into upper and lower portions of the outer surface 21 of the spindle 2 so as to be inserted into the inclined surfaces 121 and 141 formed on the inner surface 12 of the fixed holder 1. Is formed symmetrically, the upper, lower inclined surfaces 211, 213 is a portion where the upper and lower horizontal surfaces in close contact with the upper support piece 4 and in close contact with the horizontal surface 143 formed in the lower housing 13 is formed. . In addition, both ends of the upper and lower inclined surfaces 211 and 213 are formed in close contact with the vertical surfaces 122 and 142 so as to receive a force on both sides.

In addition, the upper support piece 4 is inserted into the horizontal groove portion 123 located above the inner surface 12 of the upper housing 11, the plate-shaped lower support piece 5 is the lower housing ( It is mounted in the middle of the inclined surface 141 formed on the inner surface 14 of 13 to support the lower inclined surface 213 of the spindle (2). On the other hand, the tab hole located in the upper portion of the horizontal groove portion 123 at one end of the upper support piece 4 inserted into the front and rear of the horizontal groove portion 123 formed in the upper housing 11 forming the fixed holder (1) Slotted groove 41 is formed so that the bolt head is fastened to the (123a) can be inserted.

Therefore, the present invention configured as described above, while supporting the force toward the lower side generated due to the self-load of the spindle (2) through the lower support piece 5, while supporting the force generated to the upper side during processing By supporting through the piece 4, the outer surface 21 of the spindle 2 is to be in close contact with the inner surface 12 of the fixed holder (1).

Therefore, even when the spindle 2 is used in a vertical machine tool as well as a horizontal machine tool, the spindle 2 can be prevented from being eccentric or trembling due to the spindle's own load or processing force generated during machining. will be.

In addition, the upper and lower support pieces (4, 5) for supporting the spindle (2) can be easily replaced.

The present invention as described above, by making the outer surface of the spindle and the inner surface of the fixed holder completely in contact through a plurality of support pieces, it is effective to prevent the precision from falling during processing to enable high precision machining .

In addition, by making the outer surface of the spindle and the inner surface of the fixed holder in contact with each other through the support piece as described above, there is also an effect of preventing the shaking due to the cutting load generated during machining.

In addition, when the machine tool is used for a long period of time, by replacing only the support piece for supporting the spindle, the spindle and the fixed holder constituting the main shaft also have the effect of using semi-permanently.

Claims (7)

Inner surfaces 12 and 14 having a rhombus shape are formed, and upper and lower housings 11 and 13 are integrally assembled with a fixed holder 1 and inserted into the inner surfaces 12 and 14 and the outer surface ( 21 is mounted between the spindle 2 having a rhombus shape, and between the inner surface 12, 14 of the fixed holder 1 and the outer surface 21 of the spindle 2, and the upper center of the spindle 2. Headstock of the machine tool, characterized in that consisting of upper and lower support pieces (4,5) supporting the lower both sides. 2. The work piece according to claim 1, wherein a plate-shaped middle bushing 14 is mounted at the middle of the upper and lower housings 11 and 13 of the fixed holder 1 to precisely adhere the spindle 2 to each other. Headstock of the machine. The lower surface of the upper housing 11 is formed with an inclined surface 121 which is symmetrical to both sides. The upper surface where the inclined surface 121 meets is provided with a tab hole 123a. Groove 123 is formed, the main shaft of the machine tool, characterized in that the vertical surface 122 is formed at the end of the inclined surface (121). According to claim 1, wherein the inclined surface 141 symmetrical on both sides is formed on the inner surface 14 of the lower housing 13, the lower surface where the inclined surface 141 meets the horizontal surface 143 is formed The headstock of the machine tool, characterized in that the vertical surface 142 is formed at the end of the inclined surface (141). The upper and lower inclined surfaces 211 and 213 of the upper and lower surfaces of the outer surface 21 of the spindle 2 are inserted into the inclined surfaces 121 and 141 formed on the inner surface 12 of the fixed holder 1. Both sides of the upper and lower inclined surfaces 211 and 213 are formed symmetrically, and upper and lower horizontal surfaces 212 and 214 are formed, and both ends of the upper and lower inclined surfaces 211 and 213 are in close contact with the vertical surfaces 122 and 142. The main shaft of the machine tool, characterized in that the vertical surface 215 is formed to support the forces on both sides. According to claim 1 or 3, wherein the upper support piece (4) is inserted into the horizontal groove portion 123 located above the upper housing (11), one end of the upper support piece (4) Headstock of the machine tool, characterized in that the slotted groove portion 41 is formed is inserted into the bolt head is fastened to the tab hole (123a) located in the upper portion of the horizontal groove (123). 5. The spindle 2 according to claim 1, wherein the plate-shaped lower support piece 5 is mounted in the middle of the inclined surface 141 formed on the inner side 14 of the lower housing 13. Headstock of the machine tool, characterized in that for supporting the lower inclined surface (213).