Hydraulic chuck jaw position correction device
The chuck jaw position adjustment device addresses hydraulic chuck positional errors by using a piston and sliding member mechanism for precise jaw correction, achieving high accuracy and efficiency in machining processes.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Utility models
- Current Assignee / Owner
- Filing Date
- 2026-02-11
- Publication Date
- 2026-04-08
AI Technical Summary
Existing hydraulic chuck systems suffer from positional errors due to worn hard jaws, leading to reduced machining accuracy and inefficient, cumbersome correction methods that are limited in versatility and accuracy.
A chuck jaw position adjustment device with an outer end cap, cylinder, inner end plug, and rotatable adjustment bolt, featuring sliding members and a piston mechanism that allows for precise adjustment of hard jaws by rotating the bolt to spread them evenly, ensuring high correction accuracy and adaptability to different chuck sizes.
The device achieves 5 to 10 times greater accuracy than conventional methods, reduces correction time to approximately 10 minutes, and allows multiple corrections with a single installation, enhancing machining precision and efficiency.
Smart Images
Figure 0003255451000001_ABST
Abstract
Description
Technical Field
[0001] The present invention belongs to the technical field of an apparatus for correcting the position of a chuck jaw used in a hydraulic chuck, and particularly relates to an apparatus for correcting the position of a chuck jaw for a hydraulic chuck for accurately correcting the displacement of a hard jaw in a hydraulic chuck.
Background Art
[0002] In lathe machining, a hydraulic chuck is widely used as a general apparatus for gripping a workpiece. A hydraulic chuck usually has a plurality of hard jaws that are movable along the radial direction of the chuck, and raw jaws for gripping the workpiece are respectively attached to the outer ends of these hard jaws. The hard jaws may be worn due to long-term use, and a gap may occur between the hard jaws and the jaw grooves of the chuck body. This gap causes a positional error when gripping a workpiece with the raw jaws, and ultimately becomes a factor that reduces the machining accuracy of the workpiece. To eliminate such an error, conventionally, a guide disk type chuck jaw correction apparatus described in Chinese Utility Model Publication Gazette CN220480268U has been used. However, this type of apparatus has problems such as complicated installation and use, requiring frequent attachment and detachment operations, and thus having low work efficiency. In addition, it can only be applied to chucks of specific dimensions and has poor versatility. Furthermore, in the industry, a method of fixing and correcting raw jaws using a disk-shaped clamp has also been adopted. However, the generally obtained correction accuracy is only about 0.01 to 0.02 mm, and there is a problem that the correction accuracy is insufficient while the working time also requires 30 minutes to 60 minutes or more.
Summary of the Invention
[0003] An object of the present invention is to provide an apparatus for correcting the position of a chuck jaw for a hydraulic chuck in order to solve the problems in the above-mentioned prior art.
[0004] To achieve the above technical problems, the present invention provides the following technical means. The chuck jaw position adjustment device for a hydraulic chuck according to the present invention comprises an outer end cap, a cylinder, and an inner end plug, the outer end cap and the inner end plug being fixed to both ends of the cylinder, respectively. A rotatable adjustment bolt is provided in the center of the outer end cap. The adjustment bolt extends into the cylinder. A piston is provided inside the cylinder, and a plurality of radially slidable sliding members are arranged around the cylinder. The adjustment bolt can press against and move the piston. An inclined engagement groove is formed in the sliding member, and the inclined engagement groove fits into the piston and engages slidably. The inverted conical surface of the piston presses against an inclined surface formed at the inner end of the sliding member. Preferably, the outer end cap is fixed integrally with the cylinder. Preferably, three sliding members are provided around the cylinder. Preferably, the inner end plug is secured to the cylinder by screw fastening. The lower end of the adjustment bolt is inserted into the inner end plug and rotatably supported. The adjustment bolt passes through the piston and is screw-engaged. Preferably, the inner end plug is fixed to the cylinder by a bolt. The adjustment bolt is rotatably connected to the outer end cap by screw engagement. The piston comprises an inverted conical pressing portion and an engagement base provided at its lower part. The inverted conical pressing portion and the engagement base are fixed by a bolt. A fixed stopper head is provided at the upper end of the inverted conical pressing portion, and the adjustment bolt can fit into the stopper head to press the inverted conical pressing portion. The inclined engagement groove of the sliding member fits into the engagement base and is slidably engaged. Furthermore, the inverted conical surface of the inverted conical pressing portion is configured to press against the inclined surface of the inner end of the sliding member.
[0005] The effect of the invention According to this invention, when the hard jaws become loose, rotating the adjustment bolt moves the piston, and the movement of the piston presses the sliding members, causing each sliding member to move outward simultaneously, spreading the hard jaws of the hydraulic chuck, eliminating the gap between the hard jaws and the chuck gripping groove, and thus correcting the position of the hard jaws. The sliding members are infinitely adjustable, resulting in high correction accuracy. Furthermore, since a predetermined range of motion is ensured for the piston, this device can be applied to hydraulic chucks of different sizes, and the position of the hard jaws can be corrected multiple times with a single installation, eliminating the need for frequent attachment and detachment. [Brief explanation of the drawing]
[0006] [Figure 1] Figure 1 is a first schematic diagram of a chuck jaw position correction device for a hydraulic chuck according to the present invention. [Figure 2] Figure 2 is a first cross-sectional view of the chuck jaw position correction device for a hydraulic chuck according to the present invention. [Figure 3] Figure 3 is a second schematic diagram of the chuck jaw position correction device for a hydraulic chuck according to the present invention. [Figure 4] Figure 4 is a second cross-sectional view of the chuck jaw position correction device for a hydraulic chuck according to the present invention. [Figure 5] Figure 5 is a schematic diagram of the piston of the chuck jaw position correction device for a hydraulic chuck according to the present invention. [Figure 6] Figure 6 is a schematic diagram of the sliding member of the chuck jaw position correction device for a hydraulic chuck according to the present invention. [Figure 7] Figure 7 is a schematic diagram of the inverted conical pressing part and adjustment bolt of the chuck jaw position correction device for a hydraulic chuck according to the present invention. [Figure 8] Figure 8 is a schematic diagram of the engagement base of the chuck jaw position correction device for a hydraulic chuck according to the present invention. [Figure 9] Figure 9 is a schematic diagram of the sliding member of the chuck jaw position correction device for a hydraulic chuck according to the present invention. [Modes for carrying out the invention]
[0007] The following describes in detail a specific embodiment of the chuck jaw position correction device for a hydraulic chuck according to the present invention, with reference to the attached drawings. As shown in Figures 1 and 3, the chuck jaw position adjustment device for a hydraulic chuck according to this embodiment comprises an outer end cap 1, a cylinder 2, and an inner end plug 3, with the outer end cap 1 and the inner end plug 3 fixed to both ends of the cylinder 2, respectively. A rotatable adjustment bolt 4 is provided in the center of the outer end cap 1, and a hexagonal hole is formed in the adjustment bolt 4. The adjustment bolt 4 extends into the cylinder 2. A piston 6 is provided inside the cylinder 2, and a plurality of radially slidable sliding members 5 are arranged around the cylinder 2. The adjustment bolt 4 can press and move the piston 6. An inclined engagement groove 51 is formed in the sliding member 5, and the inclined engagement groove 51 fits into the piston 6 and engages with it in a slidable manner. As shown in Figure 1, the outer end cap 1 is integrally fixed to the cylinder 2. As shown in Figure 1, three sliding members 5 are provided around the cylinder 2. As shown in Figures 1 and 2, the inner end plug 3 is fixed to the cylinder 2 by screw fastening. The lower end of the adjustment bolt 4 is inserted into the inner end plug 3 and is rotatably supported. The adjustment bolt 4 is rotatably supported without screw engagement with the outer end cap 1 and the inner end plug 3. The adjustment bolt 4 is screw-engaged through the piston 6, and a predetermined gap is provided between the piston 6 and the inner end plug 3. As shown in Figure 6, one inclined engagement groove 51 is formed on each side of the sliding member 5.
[0008] In actual use, this device is mounted at the spindle end of a lathe and at the center of the hydraulic chuck. A hydraulic chuck is typically equipped with multiple hard jaws that can move along the radial direction of the chuck, and soft jaws for gripping the workpiece are attached to the outer ends of these hard jaws. The inner ends of the hard jaws make pressing contact with the sliding member 5. If the hard jaws become loose, rotating the adjustment bolt 4 causes the piston 6 to move in the direction of the inner end plug 3, and the inverted conical surface 61 presses against the sliding member 5. As a result, the inclined engagement groove 51 is pressed simultaneously, and each sliding member 5 moves outward at the same time, pushing open the hard jaws of the hydraulic chuck, eliminating the gap between the hard jaws and the chuck gripping grooves, and correcting the position of the hard jaws. Since the piston 6 has a certain range of movement, this device can be applied to hydraulic chucks of different sizes, and the position of the hard jaws can be corrected multiple times with a single installation.
[0009] As shown in Figures 3 and 4, the inner end plug 3 is fixed to the cylinder 2 by a bolt. The adjustment bolt 4 is rotatably connected to the outer end cap 1 by screw engagement. As shown in Figures 7 and 8, the piston 6 is composed of an inverted conical pressing portion 62 and an engagement base 63 provided at its lower part. The inverted conical pressing portion 62 and the engagement base 63 are fixed by a bolt. A fixed stopper head 621 is provided at the upper end of the inverted conical pressing portion 62, and the adjustment bolt 4 can fit into the stopper head 621 to press the inverted conical pressing portion 62. The inclined engagement groove 51 of the sliding member 5 is fitted into the engagement base 63 and slidably engaged. In addition, the inverted conical surface 61 of the inverted conical pressing portion 62 is configured to press against the inclined surface of the inner end of the sliding member 5. As shown in Figure 9, an inclined engagement groove 51 is formed at the lower part of the sliding member 5.
[0010] In actual use, this device is mounted at the spindle end of a lathe and at the center of the hydraulic chuck. The hydraulic chuck is usually equipped with multiple hard jaws that can move along the radial direction of the chuck, and soft jaws for gripping the workpiece are attached to the outer ends of these hard jaws. The inner ends of the hard jaws make pressing contact with the sliding member 5. If the hard jaws become loose, rotating the adjustment bolt 4 presses the inverted conical pressing part 62, causing the inverted conical surface 61 to press against the sliding member 5. At the same time, the engagement base 63 moves toward the inner end plug 3, and consequently, the engagement between the engagement base 63 and the inclined engagement groove 51 is gradually released. As a result, each sliding member 5 moves outward simultaneously, pushing open the hard jaws of the hydraulic chuck, eliminating the gap between the hard jaws and the chuck gripping groove, and correcting the position of the hard jaws. Since the piston 6 has a certain range of movement, this device can be applied to hydraulic chucks of different sizes, and the position of the hard jaws can be corrected multiple times with a single installation. Compared to conventional disc-type clamps, this device offers 5 to 10 times greater accuracy, reduces working time to approximately 10 minutes, and provides extremely high economic value and convenience. [Explanation of Symbols]
[0011] 1. Outer end cap 2 cylinders 3. Inner end plug 4. Adjustment bolt 5. Sliding member 51 Inclined engagement groove 6 pistons 61 Inverted cone surface 62 Inverted cone-shaped pressing part 63 Engagement base 621 Stopper Head
Claims
1. A chuck jaw position correction device for a hydraulic chuck, It consists of an outer end cap, a cylinder, and an inner end plug, The outer end cap and the inner end plug are fixed to both ends of the cylinder, A rotatable adjustment bolt is provided in the center of the outer end cap. The adjustment bolt extends into the cylinder, A piston is provided inside the cylinder. Multiple sliding members that can slide radially are arranged around the cylinder, The adjustment bolt can press against and move the piston, An inclined engagement groove is formed in the sliding member. The inclined engagement groove is fitted to the piston and slidably engaged. A chuck jaw position correction device for hydraulic chucks, characterized by the following features.
2. The outer end cap is fixed integrally with the cylinder. A chuck jaw position correction device for a hydraulic chuck according to claim 1, characterized by the above.
3. Three sliding members are provided around the cylinder. A chuck jaw position correction device for a hydraulic chuck according to claim 2, characterized by the above.
4. The inner end plug is fixed to the cylinder by screw fastening. The lower end of the adjustment bolt is inserted into the inner end plug and rotatably supported. The adjustment bolt penetrates the piston and engages with it via a screw. A chuck jaw position correction device for a hydraulic chuck according to claim 1 or claim 3, characterized by the above.
5. The inner end plug is fixed to the cylinder by a bolt. The adjustment bolt is rotatably connected to the outer end cap by screw engagement, The piston is composed of an inverted conical pressing portion and an engaging base provided at its lower part. The inverted conical pressing portion and the engagement base are fixed together by bolts. A stopper head is provided fixed to the upper end of the inverted conical pressing portion. The adjustment bolt can be fitted into the stopper head and press against the inverted conical pressing portion. The inclined engagement groove of the sliding member fits into the engagement base and engages in a slidable manner. The inverted conical surface of the piston presses against the inclined surface formed on the inner end of the sliding member. A chuck jaw position correction device for a hydraulic chuck according to claim 1 or claim 3, characterized by the above.