Improved numerical control machine tool spindle

Abstract

The utility model relates to the field of numerical control machining equipment, in particular to an improved numerical control machine tool spindle which comprises a spindle body and a half clamping assembly. One end of the hollow shaft extends out of the shell, and a horn-shaped circular taper hole is formed in the center of the end and used for installing a taper-shank machine tool cutter. The Haff clamping assembly is provided with a Haff chuck and a locking piece, the Haff chuck can be inserted into the taper hole of the hollow shaft and can be driven by the locking piece to be tightened and fastened to the hollow shaft, and the Haff chuck is used for clamping the straight shank machine tool cutter when tightened. According to the utility model, the spindle of the numerical control machine tool is improved, so that the spindle of the machine tool can be used for clamping a taper-shank cutter, and also can be used for clamping a straight-shank cutter by using a Haff chuck when necessary, and the spindle of the numerical control machine tool can meet the requirements of cutters with different types of cutter handles without changing the clamping position; therefore, the application range can be expanded, and the rotating stability and machining precision of the cutter are guaranteed.

Description

TECHNICAL FIELD

[0001] The utility model relates to numerical control processing equipment field, concretely relates to an improved numerical control machine tool spindle. BACKGROUND

[0002] The spindle of numerical control machine tool is one of the core components of machine tool, which is used for clamping machine tool cutter and driving cutter rotation to realize cutting processing to workpiece. Since the shank of most cutting tools adopts 7:24 Morse taper, the spindle of current numerical control lathe is mostly in the structure form that hollow shaft is provided with inner taper hole at the shaft end and elastic draw jaw is used for cutter clamping. The utility model patent with the authorization announcement number CN203972881U discloses a numerical control machine tool spindle, which has described the internal structure of the spindle of current numerical control lathe in the specification. But in the actual application process, in addition to the taper shank cutter, sometimes straight shank cutter also needs to be used, since the straight shank cutter cannot be directly installed into the taper hole of the hollow shaft of the spindle, in order to realize the clamping of straight shank cutter, transition tool rod needs to be used for conversion connection, but the total length of cutter after conversion connection of transition tool rod will increase, which is easy to deflect in the rotation process and affect the machining precision. In view of this, how to improve the numerical control machine tool spindle to make it adapt to the needs of different types of shanks of taper shank cutter and straight shank cutter to expand its application range and ensure the stability of cutter rotation and machining precision is the problem to be solved in the case. CONTENT OF THE UTILITY MODEL

[0003] In order to overcome the defects in the prior art, the utility model discloses an improved numerical control machine tool spindle, which comprises a spindle body and a half chuck assembly, the spindle body comprises a shell and a rotatable hollow shaft arranged in the shell, one end of the hollow shaft extends to outside of the shell and a trumpet-shaped circular taper hole is arranged at the center of the end for installing taper shank machine tool cutter, the half chuck assembly is provided with a half chuck and a locking piece, the half chuck can be inserted into the taper hole of the hollow shaft and the half chuck can be tightened and fastened on the hollow shaft by the locking piece, and the half chuck is used for clamping straight shank machine tool cutter when it is tightened. Through the improvement of the numerical control machine tool spindle, the spindle of machine tool can clamp taper shank cutter and clamp straight shank cutter by the half chuck when necessary, so that the spindle of numerical control machine tool can meet the needs of cutters of different types of shanks without changing the clamping position, thereby the application range can be expanded and the stability of cutter rotation and machining precision can be ensured.

[0004] In order to achieve the above-mentioned purpose, the utility model adopts the following technical scheme:

[0005] An improved numerical control machine tool spindle, comprising a spindle body, the spindle body containing a shell and a rotatable hollow shaft arranged in the shell, characterized in that it further comprises a chucking assembly, the chucking assembly being provided with a chuck and a locking member, one end of the hollow shaft of the spindle body extending out of the shell of the spindle body and a trumpet-shaped circular taper hole being arranged in the center of the one end of the hollow shaft for mounting a taper shank machine tool cutter, the chuck being insertable into the taper hole of the hollow shaft and the chuck being driven to be tightened and fastened on the hollow shaft by the locking member, the chuck being tightened for clamping a straight shank machine tool cutter.

[0006] The chuck is a conical sleeve-shaped clamping member enclosed by two chuck blocks and provided with an outer taper surface, the two chuck blocks being of the same size and provided with a spacing t between them, the two chuck blocks being cut from one conical sleeve, the taper of the outer taper surface of the chuck being the same as the taper of the taper hole of the hollow shaft, the lower part of the chuck being provided with two steps, the lower step surface being a contact surface, and the inner hole of the chuck being a square clamping hole enclosed by two right-angle grooves.

[0007] The locking member is a screw cap-shaped member provided with a step in the inner hole, the step surface of the inner hole being a pushing surface, and the inner hole wall of the upper part of the locking member being provided with an internal thread.

[0008] The outer wall of the one end of the hollow shaft extending out of the shell of the spindle body is provided with an external thread.

[0009] The internal thread of the locking member matches the external thread of the hollow shaft, the locking member being screwable on the hollow shaft, the locking member being arranged below the chuck, the pushing surface of the locking member being able to contact the contact surface of the chuck and push the chuck to move upward when the locking member is rotated.

[0010] The chucking assembly further comprises an unchucking member, the unchucking member being provided with a horizontal plate and a screw rod screwable on one end of the horizontal plate, the unchucking member being provided in two pieces, the two pieces of the unchucking member being symmetrically arranged and the horizontal plates of the two pieces of the unchucking member being respectively fixedly connected to the lower parts of the two chuck blocks of the chuck, and the rod ends of the screw rods of the two pieces of the unchucking member being upward.

[0011] The spindle body further contains a driving member for driving the hollow shaft to rotate, an elastic pull claw arranged in the hollow shaft, and a pulling member for driving the elastic pull claw to move up and down for clamping.

[0012] From the above description, the improved numerical control machine tool spindle has the following advantages: the hollow shaft of the spindle body is extended to the outside of the shell of the spindle body, and a horn-shaped circular taper hole is arranged at the center of the end of the hollow shaft for mounting a taper handle machine tool cutter, the half clamping assembly is provided with a locking piece and a tapered sleeve-shaped half chuck formed by two half blocks, the half chuck can be inserted into the taper hole of the hollow shaft when necessary, and the half chuck can be driven by the locking piece to be tightened and fastened on the hollow shaft for clamping a straight handle machine tool cutter, so that the machine tool spindle can clamp taper handle cutters and straight handle cutters when necessary, so that the spindle of the numerical control machine tool can meet the needs of different types of cutter handles and does not change the clamping position. The numerical control machine tool spindle is improved, the application range is expanded, and the stability of cutter rotation and machining precision are ensured. The utility model has the advantages of reasonable design, simple structure, low cost and convenience for promotion. BRIEF DESCRIPTION OF DRAWINGS

[0013] Figure 1 It is an overall schematic view of the improved numerical control machine tool spindle.

[0014] Figure 2 It is a schematic view of the spindle body.

[0015] Figure 3 It is Figure 2 A schematic view of A in

[0016] Figure 4 It is an enlarged schematic view of the half clamping assembly.

[0017] Figure 5 It is an enlarged schematic view of the half chuck.

[0018] Figure 6 It is Figure 5 B-B enlarged schematic view in

[0019] Figure 7 It is an enlarged schematic view of the locking piece.

[0020] Figure 8 It is an enlarged schematic view of the unclamping piece.

[0021] Reference signs:

[0022] 1 spindle body; 11 hollow shaft; 111 taper hole; 112 external thread; 2 half clamping assembly; 21 half chuck; 211 outer taper surface; 212 abutting surface; 213 clamping hole; 22 locking piece; 221 internal thread; 222 pushing surface; 23 unclamping piece; 231 horizontal plate; 232 screw rod. DETAILED DESCRIPTION

[0023] The utility model will be further described through specific embodiments.

[0024] As Figures 1 to 4 shown, the improved numerical control machine tool spindle, including spindle body 1 and half clamping assembly 2, the spindle body 1 contains the shell and placed in the shell rotatable hollow shaft 11, the hollow shaft 11 one end extends to the shell outside the spindle body 1 and in the center of the hollow shaft 11 this end is provided with a horn-shaped circular taper hole 111 for installing taper handle machine tool cutter, the hollow shaft 11 extends in the outer wall of the spindle body 1 shell outside one end is provided with external thread 112. The spindle body 1 also contains the driving member and the elastic pull claw placed in the hollow shaft 11 of the driving member and the elastic pull claw, and the pulling member drives the elastic pull claw to move up and down for clamping. The half clamping assembly 2 is provided with half chuck 21, locking member 22 and ejector 23, the half chuck 21 can be inserted into the taper hole 111 of the hollow shaft 11 and the locking member 22 can drive the half chuck 21 to tighten and fasten on the hollow shaft 11, the half chuck 21 is used for clamping straight handle machine tool cutter when tightening.

[0025] As Figures 1 to 7 shown, the half chuck 21 of the utility model is a conical sleeve-shaped clamping member surrounded by two half blocks and provided with an outer taper surface 211, the two half blocks are the same size and have a spacing t between them, the two half blocks can be cut from a conical sleeve, the taper of the outer taper surface 211 of the half chuck 21 is the same as the taper of the taper hole 111 of the hollow shaft 11, the lower part of the half chuck 21 is provided with two steps, the lower step surface is a contact surface 212, and the inner hole of the half chuck 21 is a square clamping hole 213 surrounded by two right-angle grooves. The locking member 22 is a screw cap-shaped member with a stepped inner hole, the stepped surface of the inner hole is a pushing surface 222, and the inner thread 221 is provided on the inner hole wall of the upper part of the locking member 22. The inner thread 221 on the locking member 22 matches the external thread 112 of the hollow shaft 11, the locking member 22 can be screwed on the hollow shaft 11, the locking member 22 is placed below the half chuck 21, and when the locking member 22 is rotated, the pushing surface 222 can be in contact with the contact surface 212 of the half chuck 21 and can push the half chuck 21 to move upwards.

[0026] As Figure 1 , Figure 4 and Figure 8 shown, the utility model discloses the ejector 23 is provided with a horizontal plate 231 and a screw rod 232 screwed on one end of the horizontal plate 231, the ejector 23 is provided with two, the two ejectors 23 are symmetrically arranged, and the horizontal plates 231 of the two ejectors 23 are respectively fixedly connected to the lower parts of the two half blocks of the half chuck 21, and the rod ends of the screw rods 232 are upward.

[0027] If the machine tool to be used is a taper shank tool, the taper shank of the tool can be directly inserted into the taper hole 111 of the hollow shaft 11 of the main shaft body 1, and the elastic claw and the pulling member of the main shaft body 1 can be used for tension clamping, so that the tool can be used.

[0028] If the machine tool to be used is a straight shank tool, the collet chuck 21 of the collet clamping assembly 2 can be inserted into the taper hole 111 of the hollow shaft 11 of the main shaft body 1, and the locking piece 22 is screwed on the hollow shaft 11 and the thrust surface 222 of the locking piece 22 contacts the abutting surface 212 of the collet chuck 21; then the straight shank of the tool is inserted into the clamping hole 213 of the collet chuck 21, and the locking piece 22 is screwed and the collet chuck 21 is pushed upward, so that the two collet blocks of the collet chuck 21 are tightened under the action of the taper surface of the taper hole 111 of the hollow shaft 11, and the straight shank of the tool is tightly clamped, so that the tool can be used. After processing, the locking piece 22 is screwed in the opposite direction and removed, the screw rod 232 of the ejector 23 is screwed, and the rod end of the screw rod 232 abuts against the lower end of the hollow shaft 11, and the screw rod 232 is continuously screwed, so that the collet chuck 21 is withdrawn from the taper hole 111 of the hollow shaft 11 and the tool can be removed.

[0029] The utility model discloses an improved numerical control machine tool main shaft, one end of the hollow shaft 11 of the main shaft body 1 extends to the shell of the main shaft body 1 and is provided with a trumpet-shaped circular taper hole 111 at the center of the one end of the hollow shaft 11 for installing a taper shank machine tool, the collet clamping assembly 2 is provided with a locking piece 22 and a tapered sleeve-shaped collet chuck 21 formed by two collet blocks, when necessary, the collet chuck 21 can be inserted into the taper hole 111 of the hollow shaft 11 and the collet chuck 21 can be tightened and fastened on the hollow shaft 11 by the locking piece 22 for clamping a straight shank machine tool, so that the machine tool main shaft can clamp a taper shank tool, and when necessary, a straight shank tool can also be clamped by the collet chuck 21, so that the main shaft of the numerical control machine tool can meet the needs of different types of tool shanks and does not change the clamping position, thereby expanding the application range and ensuring the stability of tool rotation and processing precision.

[0030] The above is only one specific embodiment of the utility model, but the design concept of the utility model is not limited to this, and any non-essential modification of the utility model by using this concept shall belong to the act of infringing the protection scope of the utility model.

Claims

1. An improved main spindle for a numerically controlled machine tool, comprising a main spindle body (1) which comprises a housing and a rotatable circular hollow shaft (11) disposed in the housing, characterized in that: The chuck clamping assembly (2) is provided with a chuck chuck (21) and a locking member (22), one end of the hollow shaft (11) of the main shaft body (1) extends to the outside of the shell of the main shaft body (1), and a trumpet-shaped circular taper hole (111) is arranged at the center of the end of the hollow shaft (11), the chuck chuck (21) can be inserted into the taper hole (111) of the hollow shaft (11), and the chuck chuck (21) can be driven by the locking member (22) to be tightened and fastened on the hollow shaft (11).

2. The improved CNC machine tool spindle as claimed in claim 1, wherein: The chuck chuck (21) is a conical sleeve-shaped clamping member surrounded by two chuck blocks and provided with an outer taper surface (211), the two chuck blocks are the same size and have a spacing t between them, the taper of the outer taper surface (211) of the chuck chuck (21) is the same as the taper of the taper hole (111) of the hollow shaft (11), the lower part of the chuck chuck (21) is provided with two steps, the lower step surface is a contact surface (212), and the inner hole of the chuck chuck (21) is a square clamping hole (213) surrounded by two right-angle grooves.

3. The improved CNC machine tool spindle as claimed in claim 2, wherein: The locking member (22) is a screw cap-shaped member with a stepped inner hole, the stepped surface of the inner hole is a pushing surface (222), and the inner thread (221) is arranged on the inner hole wall of the upper part of the locking member (22).

4. The improved CNC machine tool spindle as claimed in claim 3, wherein: The outer thread (112) is arranged on the outer wall of the end of the hollow shaft (11) extending outside the shell of the main shaft body (1).

5. The improved CNC machine tool spindle as claimed in claim 4, wherein: The inner thread (221) on the locking member (22) matches the outer thread (112) of the hollow shaft (11), the locking member (22) can be screwed on the hollow shaft (11), the locking member (22) is arranged below the chuck chuck (21), and when the locking member (22) is rotated, the pushing surface (222) can abut against the contact surface (212) of the chuck chuck (21) and push the chuck chuck (21) upward.

6. The improved CNC machine tool spindle as claimed in claim 5, wherein: The chuck clamping assembly (2) further comprises a chuck releasing member (23), the chuck releasing member (23) is provided with a cross plate (231) and a screw rod (232) screwed on one end of the cross plate (231), the chuck releasing member (23) is provided in two pieces, the two chuck releasing members (23) are symmetrically arranged, and the cross plates (231) of the two chuck releasing members (23) are respectively fixedly connected to the lower parts of the two chuck blocks of the chuck chuck (21).

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