High-precision X-Z axis system for grinding center

Abstract

The utility model discloses a high-precision X-Z axis system for a grinding center, which relates to the field of grinding machines, and comprises a hydrostatic guideway mechanism and a feeding mechanism, the feeding mechanism is used for driving the hydrostatic guideway mechanism to move, the hydrostatic guideway mechanism comprises a lathe bed, a hydrostatic guideway, a sliding table and a hydrostatic sliding block, the sliding table is arranged on the side, away from the lathe bed, of the hydrostatic guideway. Hydraulic oil is added between the static pressure guide rail and the static pressure sliding block, an oil film can be formed between the sliding block and the guide rail, vibration generated in the grinding process can be reduced through the oil film, and therefore the grinding quality is improved, the sliding block can float upwards through the oil film, in the moving process of the sliding block, the sliding block and the guide rail are not in direct contact, and the sliding block and the guide rail are separated by the oil film. Therefore, abrasion is avoided and the service life is long; meanwhile, the grinding machine has the advantages of being high in anti-overturning performance, capable of being used for grinding with the large single-time feeding amount, high in stability, capable of improving the grinding efficiency and the like.

Description

Technical Field

[0001] The utility model relates to the field of grinding machines, and particularly to a high-precision XZ axis system for a grinding center. Background Art

[0002] With the development of parts used in various industries towards high precision, and with the increasingly fierce competition among enterprises, new requirements are put forward for industrial mother machines, namely high efficiency, high precision, long life, and good stability. In a compound grinding center, the XZ axis system is the guarantee of the first precision of the machine tool. Therefore, the guide rail precision, feed precision, and stability of the XZ axis system will directly affect the precision of the whole machine tool.

[0003] In the XZ axis system of traditional compound internal and external cylindrical grinding machines, linear guide rails are usually used as the guide rails of the machine tool. Since they can be directly purchased from linear guide rail manufacturers, the complexity of design and assembly is reduced, and the moving speed is fast and high-precision models can be selected. However, at the same time, it has the following disadvantages:

[0004] 1) The anti-overturning performance is poor, and a large overturning moment will be generated during the grinding process with a large single feed amount, so the grinding efficiency is low;

[0005] 2) Due to the working principle of the linear guide rail, the slider of the linear guide rail remains in contact with the guide rail during the moving process, so wear will occur, and the wear will intensify after long-term use, seriously affecting the precision of the XZ axis system of the machine tool;

[0006] 3) Vibration will inevitably occur during the grinding process, and the slider of the linear guide rail is in direct contact with the guide rail, so the vibration cannot be eliminated, and the vibration will cause the wear between the slider and the guide rail to intensify, thus reducing the grinding quality. Content of the Utility Model

[0007] Purpose of the Utility Model: Aiming at the above disadvantages, the utility model provides a high-precision XZ axis system for a grinding center to solve the above problems existing in the prior art.

[0008] Technical Solution: A high-precision XZ axis system for a grinding center includes a hydrostatic guide rail mechanism and a feed mechanism. The feed mechanism is used to drive the hydrostatic guide rail mechanism to move. The hydrostatic guide rail mechanism includes a bed body, a hydrostatic guide rail, a slide table, and a hydrostatic slider;

[0009] Wherein, the hydrostatic guide rail is installed on the bed body, the slide table is arranged on the side of the hydrostatic guide rail away from the bed body, the hydrostatic slider is connected between the slide table and the hydrostatic guide rail, an oil inlet hole is opened on the contact surface between the hydrostatic slider and the slide table, and four oil outlet cavities, namely a left oil cavity, an upper oil cavity, a right oil cavity, and a lower oil cavity, which are communicated with the oil inlet hole, are respectively opened on four surfaces of the hydrostatic slider parallel to the extending direction of the hydrostatic guide rail;

[0010] Inject the pressurized hydraulic oil into the oil inlet hole. The hydraulic oil flows inside the hydrostatic slider and then flows out through the four oil outlet cavities respectively, acting on the contact surfaces between the hydrostatic slider and the hydrostatic guide rail, and generating an oil pressure film.

[0011] In a further embodiment, the hydrostatic guide rail mechanism further includes a high-precision linear grating;

[0012] The high-precision linear grating is installed on the slide table for monitoring the actual position of the slide table.

[0013] In a further embodiment, the feeding mechanism includes a ball screw, a transmission chain assembly and a servo motor;

[0014] The ball screw is connected to the slide table; the transmission chain assembly is connected between the ball screw and the servo motor. The servo motor provides power, and the power is transmitted to the ball screw through the transmission chain assembly, so that the slide table moves translationally along the extension direction of the hydrostatic guide rail.

[0015] In a further embodiment, the transmission chain assembly includes a large pulley, a belt and a small pulley;

[0016] The large pulley is connected to the ball screw, the small pulley is connected to the drive end of the servo motor, the belt is connected between the small pulley and the large pulley. When the drive end of the servo motor rotates, the power is transmitted to the small pulley and then transmitted to the large pulley through the belt, and then transmitted to the ball screw.

[0017] In a further embodiment, the ball screw includes a screw rod and a nut;

[0018] The nut is connected to the slide table, the screw rod is in spiral fit with the nut, and the end of the screw rod is connected to the large pulley.

[0019] In a further embodiment, the pressurized hydraulic oil in the left oil cavity and the right oil cavity respectively generates lateral oil pressure films between the hydrostatic slider and the corresponding contact surfaces, playing a guiding role. The pressurized hydraulic oil in the upper oil cavity and the lower oil cavity respectively generates vertical oil pressure films between the hydrostatic slider and the corresponding contact surfaces, playing a role of load bearing and maintaining.

[0020] Beneficial effects: The present utility model discloses a high-precision XZ axis system for a grinding center. By adding hydraulic oil between the hydrostatic guide rail and the hydrostatic slider, not only can an oil film be formed between the slider and the guide rail, and the oil film can reduce the vibration generated during the grinding process, thereby improving the grinding quality, but also the oil film can make the slider float, so that during the movement of the slider, the slider and the guide rail do not come into direct contact and are separated by the oil film in the middle, so no wear occurs and the service life is long. At the same time, it also has strong anti-overturning performance, can be used for grinding with a relatively large single feed amount, has high stability, and improves the grinding efficiency, etc. Brief Description of the Drawings

[0021] Figure 1 It is an exploded structural schematic diagram of the present utility model.

[0022] Figure 2 It is a side view structural schematic diagram of the present utility model.

[0023] Figure 3 It is a structural schematic diagram of the hydrostatic slider of the present utility model.

[0024] Figure 4 It is a structural schematic diagram of the hydrostatic slider from another perspective of the present utility model.

[0025] Figure 5 It is a sectional structural schematic diagram of the present utility model.

[0026] Figure 6 is Figure 5 a partial enlarged view of part A in

[0027] The reference numerals in the figures are as follows: 1, bed; 2, slide; 3, hydrostatic slider; 301, oil inlet hole; 302, left oil cavity; 303, upper oil cavity; 304, right oil cavity; 305, lower oil cavity; 4, hydrostatic guide rail; 5, high-precision linear grating; 6, ball screw; 601, screw rod; 602, nut; 7, large pulley; 8, belt; 9, small pulley; 10, servo motor. Specific Embodiments

[0028] In the following description, a large number of specific details are given to provide a more thorough understanding of the present utility model. However, it is obvious to those skilled in the art that the present utility model can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present utility model, some well-known technical features in the art are not described.

[0029] The applicant believes that in the XZ-axis system of traditional compound internal and external cylindrical grinding machines, linear guides are usually used as the machine tools' guides. Although they have some advantages, they also have some disadvantages. For example, their anti-overturning performance is poor, and a large overturning moment will be generated during the grinding process with a large single feed rate, so the grinding efficiency is low. Due to the working principle of linear guides, the slider of the linear guide remains in contact with the guide during movement, so wear will occur, and the wear will intensify after long-term use, seriously affecting the accuracy of the XZ-axis system of the machine tool. During the grinding process, vibration will inevitably occur, and the slider of the linear guide is in direct contact with the guide, unable to eliminate the vibration, and the vibration will cause the wear between the slider and the guide to intensify, thereby reducing the grinding quality.

[0030] Therefore, the applicant proposes a high-precision XZ-axis system for a grinding center, as Figures 1-6 shown, which includes a hydrostatic guide mechanism and a feeding mechanism. The feeding mechanism is used to drive the hydrostatic guide mechanism to move. The hydrostatic guide mechanism includes a bed 1, a hydrostatic guide 4, a slide table 2, hydrostatic sliders 3, and a high-precision linear grating 5.

[0031] Among them, the hydrostatic guide 4 is installed on the bed 1. The slide table 2 is arranged on the side of the hydrostatic guide 4 away from the bed 1. The hydrostatic sliders 3 are connected between the slide table 2 and the hydrostatic guide 4. The high-precision linear grating 5 is installed on the slide table 2 and is used to monitor the actual position of the slide table 2.

[0032] In this application, there are two hydrostatic guides 4 and four hydrostatic sliders 3. The four hydrostatic sliders 3 are installed on the slide table 2, distributed in a quadrilateral shape, and are respectively installed on the two hydrostatic guides 4, which ensures the movement of the slide table 2 along the hydrostatic guide 4 on the bed 1. At the same time, the slide table 2 and the load on the slide table 2 are also distributed to the four hydrostatic sliders 3. The hydrostatic guide 4 is installed on the bed 1 to limit the movement of the hydrostatic sliders 3 in the vertical direction and provide a working surface for the pressurized hydraulic oil.

[0033] In addition, as Figures 2-6 shown, an oil inlet hole 301 is opened on the contact surface between the hydrostatic slider 3 and the slide table 2. Four oil outlet cavities, namely a left oil cavity 302, an upper oil cavity 303, a right oil cavity 304, and a lower oil cavity 305, which are respectively communicated with the oil inlet hole 301, are also opened on the four surfaces of the hydrostatic slider 3 parallel to the extending direction of the hydrostatic guide 4.

[0034] In this application, the principle of the hydrostatic guide mechanism is to establish a stable oil pressure film between the hydrostatic slider 3 and the hydrostatic guide 4 through hydrostatic technology to reduce friction and wear and provide smooth movement at the same time.

[0035] This application is achieved by injecting pressurized hydraulic oil between the hydrostatic slider 3 and the hydrostatic guideway 4. Specifically, the pressurized hydraulic oil flows into the interior of the hydrostatic slider 3 from the oil inlet hole 301 of the hydrostatic slider 3, and then flows into each oil cavity of the hydrostatic slider 3. The hydraulic oil flowing out of each oil cavity acts on each working surface respectively, generating an oil pressure film. The hydrostatic slider 3 floats by the pressure of the above-mentioned hydraulic oil, and the above-mentioned oil pressure film separates the hydrostatic slider 3 from each working surface. At this time, the hydrostatic slider 3 has no direct contact with the above-mentioned working surface, so no wear occurs.

[0036] The oil inlet hole 301 is opened on the top surface of the hydrostatic slider 3. The pressurized hydraulic oil enters the hydrostatic slider 3 from this oil inlet hole 301, and then reaches the oil cavity through the oil circuit inside the hydrostatic slider 3. There are four oil cavities, namely the left oil cavity 302, the right oil cavity 304, the upper oil cavity 303, and the lower oil cavity 305. The pressurized hydraulic oil in the left oil cavity 302 and the right oil cavity 304 can respectively generate lateral oil films between the hydrostatic slider 3 and the corresponding working surfaces, playing a guiding role. The pressurized hydraulic oil in the upper oil cavity 303 and the lower oil cavity 305 can respectively generate vertical oil films between the hydrostatic slider 3 and the corresponding working surfaces, playing a role of load bearing and maintaining.

[0037] As Figure 1 shown, the feeding mechanism includes a ball screw 6, a large pulley 7, a belt 8, a small pulley 9, and a servo motor 10.

[0038] Among them, the ball screw 6 is connected to the slide table 2, including a screw rod 601 and a nut 602. The nut 602 is connected to the slide table 2, and the screw rod 601 is in spiral fit with the nut 602. The end of the screw rod 601 is connected to the large pulley 7, the large pulley 7 is connected to the ball screw 6, the small pulley 9 is connected to the driving end of the servo motor 10, the belt 8 is connected between the small pulley 9 and the large pulley 7, and the large pulley 7, the belt 8, and the small pulley 9 form a transmission chain assembly.

[0039] In this application, the nut 602 of the ball screw 6 is installed on the slide table 2, and the servo motor 10 provides power, which is transmitted to the ball screw 6 through the small pulley 9, the belt 8, and the large pulley 7 in sequence. When the driving end of the servo motor 10 rotates, the power is transmitted to the ball screw 6 through the above-mentioned transmission chain assembly, causing the screw rod 601 to rotate. Since the screw rod 601 and the nut 602 are in spiral fit and the nut 602 is installed on the slide table 2, finally the slide table 2 performs a translational motion along the extension direction of the above-mentioned hydrostatic guideway 4.

[0040] In addition, in this application, the high-precision linear grating 5 is installed on the slide table 2 to monitor the current actual position of the slide table 2, and forms a closed-loop control in cooperation with the servo motor 10 and others to achieve the purpose of high-precision feeding.

[0041] The setting of the relevant components of this application realizes the non-wearing of the hydrostatic slider 3 and the hydrostatic guide rail 4, has the advantages of long service life, and has good anti-overturning performance. It can also prevent the crawling phenomenon. At the same time, due to the existence of the oil film, it has good shock absorption performance. Through the setting of the high-precision linear grating 5, the feed accuracy is guaranteed, and the feed resolution can reach 0.0001 mm.

[0042] As above, although the present utility model has been shown and described with reference to specific preferred embodiments, it should not be construed as a limitation of the present utility model itself. Various changes in form and detail may be made without departing from the spirit and scope of the present utility model defined by the appended claims.

Claims

1. A high-precision XZ-axis system for a grinding center, characterized in that, It includes a hydrostatic guide mechanism and a feed mechanism. The feed mechanism is used to drive the hydrostatic guide mechanism to move. The hydrostatic guide mechanism includes: A bed; A hydrostatic guide, installed on the bed; A slide table, arranged on the side of the hydrostatic guide away from the bed; A hydrostatic slider, connected between the slide table and the hydrostatic guide. An oil inlet hole is opened on the contact surface between the hydrostatic slider and the slide table. Four oil outlet cavities, namely a left oil cavity, an upper oil cavity, a right oil cavity, and a lower oil cavity, which are in communication with the oil inlet hole, are respectively opened on the four surfaces of the hydrostatic slider parallel to the extension direction of the hydrostatic guide; Pressurized hydraulic oil is injected from the oil inlet hole. The hydraulic oil flows inside the hydrostatic slider and then flows out through the four oil outlet cavities respectively, acts on the contact surface between the hydrostatic slider and the hydrostatic guide, and generates an oil pressure film.

2. The high-precision XZ axis system for a grinding center according to claim 1, wherein: The hydrostatic guide mechanism further includes a high-precision linear grating; The high-precision linear grating is installed on the slide table and is used to monitor the actual position of the slide table.

3. The high-precision XZ axis system for a grinding center according to claim 1, characterized in that: The feed mechanism includes a ball screw, a transmission chain assembly, and a servo motor; The ball screw is connected to the slide table; the transmission chain assembly is connected between the ball screw and the servo motor; The servo motor provides power. The power is transmitted to the ball screw through the transmission chain assembly, so that the slide table performs a translational motion along the extension direction of the hydrostatic guide.

4. The high-precision XZ axis system for a grinding center according to claim 3, characterized in that: The transmission chain assembly includes a large pulley, a belt, and a small pulley; The large pulley is connected to the ball screw, the small pulley is connected to the drive end of the servo motor, and the belt is connected between the small pulley and the large pulley; When the drive end of the servo motor rotates, the power is transmitted to the small pulley, and then transmitted to the large pulley through the belt, and then transmitted to the ball screw.

5. The high-precision XZ axis system for a grinding center according to claim 4, characterized in that: The ball screw includes a screw rod and a nut; The nut is connected to the slide table, the screw rod is in screw fit with the nut, and the end of the screw rod is connected to the large pulley.

6. The high-precision XZ axis system for a grinding center according to claim 1, characterized in that: The pressurized hydraulic oil in the left oil cavity and the right oil cavity respectively generates lateral oil pressure films between the hydrostatic slider and the corresponding contact surfaces; The pressurized hydraulic oil in the upper oil cavity and the lower oil cavity respectively generates vertical oil pressure films between the hydrostatic slider and the corresponding contact surfaces.

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