CN218697170U - Metal mold machining grinding machine - Google Patents

Abstract

The utility model relates to the technical field of mold processing, in particular to a metal mold processing grinding machine, which meets the requirement of processing a circular arc curved surface on a flat plate or a block-shaped workpiece in the metal mold processing, and has high processing precision and high practicability; the grinding disc grinding machine comprises a base, a main shaft and a grinding disc, wherein the main shaft is arranged on a rack of the base, and the grinding disc is arranged on an output shaft of the main shaft; still include the support, two swing arms, heightening the subassembly, load slip table and reciprocating mechanism, the pedestal mounting is on the base of base, both ends all are provided with the pivot around the support, the axis of two pivots is parallel with the axis of mill and is located the mill axis under, heightening the subassembly is all installed to the lower part of two swing arms, heightening the subassembly of two swing arms rotates with the pivot at both ends around the support respectively and is connected, load the top at two swing arms at the slip table, reciprocating mechanism installs in the frame of base, reciprocating mechanism is connected with the upper portion transmission of two swing arms, reciprocating mechanism drives two swing arm horizontal hunting.

Description

Metal mold machining grinding machine

Technical Field

The utility model relates to a technical field of mould processing especially relates to a metal mold processing grinding machine.

Background

The grinding machine is a machine tool for grinding the surface of a workpiece by using a grinding tool, and is widely applied to metal mold machining, the types of the grinding machines are various, some grinding machines are mainly used for grinding the plane of a flat workpiece, and some grinding machines are mainly used for grinding the cylindrical surface of a cylindrical workpiece, but the research on grinding an arc-shaped curved surface on the flat workpiece or the block workpiece is less; however, in the metal mold machining, especially in the mold with many curved surfaces, such as the sheet metal mold of the automobile outer panel, it is necessary to grind the convex arc-shaped curved surface on the large flat plate or the block-shaped workpiece, so a grinding machine capable of grinding the convex arc-shaped curved surfaces with different diameters on the flat plate will have practical significance.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the utility model provides a satisfy the demand of processing circular arc curved surface on dull and stereotyped or cubic work piece in the metal mold processing, machining precision is high, the metal mold processing grinding machine that the practicality is high.

The utility model discloses a metal mold processing grinding machine, which comprises a base, a main shaft and a grinding disc, wherein the base is provided with a base and a liftable rack; the grinding machine also comprises a support, two swing arms, a height adjusting assembly, a loading sliding table and a reciprocating mechanism, wherein the support is arranged on a base of the base, rotating shafts are arranged at the front end and the rear end of the support, the two rotating shafts are coaxial, the axes of the two rotating shafts are parallel to the axis of the grinding disc and are positioned under the axis of the grinding disc, the height adjusting assembly is arranged at the lower parts of the two swing arms, the height adjusting assembly of the two swing arms is respectively and rotatably connected with the rotating shafts at the front end and the rear end of the support, the loading sliding table is arranged at the top ends of the two swing arms and used for clamping a workpiece, the reciprocating mechanism is arranged on a frame of the base and is in transmission connection with the upper parts of the two swing arms, and the reciprocating mechanism drives the two swing arms to swing left and right to enable the workpiece to swing back and forth along an arc line for grinding; clamping the work piece blank to loading the slip table on, adjust the height-adjusting subassembly according to the diameter of the circular arc curved surface of work piece design, make the distance of the pivot center of support to the machined surface of work piece match with above-mentioned diameter, start the main shaft, the main shaft drives the high-speed rotation of mill, start reciprocating mechanism, reciprocating mechanism drives two swing arm swing back and forth, thereby make the work piece blank that loads on the slip table along the arc swing back and forth, make the work piece blank personally submit the circular arc curved surface with the contact of pivoted mill, thereby make the mill grind the convex circular arc curved surface out with the work piece, compare in using milling machine processing, the precision on the surface of work piece is higher, satisfy the requirement to dull and stereotyped or cubic work piece processing circular arc curved surface in the metal mold processing, therefore, the practicability is high.

Preferably, the height adjusting assembly comprises two height adjusting sliders, a plurality of locking bolts and two push rods, vertical sliding grooves are formed in the lower portions of the two swing arms, the two height adjusting sliders are respectively slidably mounted in the sliding grooves of the two swing arms, the two height adjusting sliders are respectively rotatably connected with rotating shafts at the front end and the rear end of the support, the two height adjusting sliders are respectively provided with two locking bolts, the locking bolts lock the relative positions of the two height adjusting sliders and the two swing arms, the fixed ends of the two push rods are respectively mounted on the side walls of the two swing arms, and the moving ends of the two push rods are respectively connected with the two height adjusting sliders; when the curved surface radius of the processing surface of the workpiece needs to be adjusted, two push rods are operated to synchronously extend or shorten, so that the two heightening slide blocks move up and down in the sliding grooves of the two swing arms, the curved surface radius is changed, a plurality of locking bolts are screwed up after the heightening is completed to lock the positions of the two swing arms and the two heightening slide blocks, the equipment can process arc curved surfaces with different diameters, and the universality is high.

Preferably, the reciprocating mechanism comprises two upper sliders, a push shaft, a reciprocating sliding table, a first screw rod, an auxiliary frame, a first stepping motor and an optical shaft, wherein vertical slideways are arranged at the upper parts of the two swing arms, the two upper sliders are respectively and slidably mounted in the slideways of the two swing arms, two ends of the push shaft are respectively and rotatably connected with the two upper sliders, the reciprocating sliding table is rotatably mounted in the middle of the push shaft, the first screw rod is in transmission connection with the reciprocating sliding table through a screw rod nut, one end of the first screw rod is rotatably connected with the frame of the base, the other end of the first screw rod is rotatably connected with the auxiliary frame, the auxiliary frame is vertically mounted on the base of the base, the first stepping motor is mounted on the auxiliary frame, an output shaft of the first stepping motor is in transmission connection with the screw rod together, two ends of the optical shaft are respectively mounted on the auxiliary frame and the frame of the base, and the middle of the optical shaft is slidably connected with the reciprocating sliding table; during grinding, a stepping motor drives a screw rod I to rotate in a reciprocating and positive and negative mode, the screw rod I drives a reciprocating sliding table and a push shaft to reciprocate along an optical axis through a screw nut, the push shaft drives two swing arms to swing in a reciprocating mode through two upper sliders, in the swinging process, the two upper sliders slide back and forth in the slide ways of the two swing arms, the two swing arms drive the loading sliding table and a workpiece to swing in a reciprocating mode in the left and right directions, the amplitude and the speed of the reciprocating sliding table to reciprocate can be adjusted flexibly through programming, the automatic grinding device is suitable for flat plates and massive workpieces of different specifications, the work is more stable, and the practicability is high.

Preferably, the damping device further comprises two dampers, wherein one ends of the two dampers are respectively and rotatably connected with the two upper sliding blocks, and the other ends of the two dampers are rotatably connected with the frame of the base; through installing at two dampers, eliminate the vibrations when two swing arms swing back and forth, improve and establish the stability of other operations.

Preferably, the loading sliding table comprises a platform, two sliding rails, a second screw rod, a second stepping motor, a second screw rod nut seat, a sliding table, a first screw rod and a pressing plate, the platform is installed at the top ends of two swing arms, the two sliding rails are installed on the upper end face of the platform in parallel, the two ends of the second screw rod are installed at the front end and the rear end of the platform respectively through vertical plates in a rotating mode, the second stepping motor is installed on one vertical plate, an output shaft of the second stepping motor is in transmission connection with the second screw rod, the sliding table is installed on the two sliding rails in a sliding mode through a plurality of sliding blocks, the sliding table is in transmission connection with the second screw rod through screw nuts in the second screw rod nut seat, the front end and the rear end of the sliding table are both provided with backup plates, the middle of the first screw rod is in rotating mode and connected to one backup plate of the sliding table, the pressing plate is installed at the inner end of the first screw rod in a rotating mode, and the outer end of the first screw rod is provided with a hand wheel; the workpiece is placed on the sliding table, the first screw rod is rotated to enable the pressing plate to clamp the workpiece tightly, rapid clamping of the workpiece is achieved, the second stepping motor drives the second screw rod to rotate when grinding is conducted, the second screw rod drives the sliding table to move along the two sliding rails through the screw rod and nut seat, accordingly, the whole machining face of the workpiece is all ground by the grinding disc, automatic machining is achieved, and the practicability is high.

Preferably, the frame of the base comprises two upright posts, a main shaft frame and two screw rods II, the two upright posts are provided with vertical guide grooves, the front end and the rear end of the main shaft frame are respectively slidably mounted in the guide grooves of the two upright posts, the main shaft is mounted on the main shaft frame, the two screw rods II are respectively vertically and rotatably mounted in the two upright posts, and the two screw rods II are respectively rotatably screwed with the front end and the rear end of the main shaft frame; and the two second screw rods are rotated, so that the main shaft frame moves downwards along the guide grooves of the two stand columns, the grinding disc is in surface contact with the workpiece, the height of the main shaft frame is gradually reduced in the grinding process, the grinding feed amount is controlled, the equipment is prevented from being damaged and the workpiece is scrapped due to the overlarge feed amount, and the practicability of the equipment is improved.

Compared with the prior art, the beneficial effects of the utility model are that: clamping the work piece blank to loading the slip table on, adjust the height-adjusting subassembly according to the diameter of the circular arc curved surface of work piece design, make the distance of the pivot center of support to the machined surface of work piece match with above-mentioned diameter, start the main shaft, the main shaft drives the high-speed rotation of mill, start reciprocating mechanism, reciprocating mechanism drives two swing arm swing back and forth, thereby make the work piece blank that loads on the slip table along the arc swing back and forth, make the work piece blank personally submit the circular arc curved surface with the contact of pivoted mill, thereby make the mill grind the convex circular arc curved surface out with the work piece, compare in using milling machine processing, the precision on the surface of work piece is higher, satisfy the requirement to dull and stereotyped or cubic work piece processing circular arc curved surface in the metal mold processing, therefore, the practicability is high.

Drawings

Fig. 1 is a schematic structural diagram of the present invention;

FIG. 2 is a front view of the present invention;

FIG. 3 is a schematic structural view of the reciprocating mechanism and the height adjustment assembly;

FIG. 4 is a schematic view of a structure of a loading slide and the like;

in the drawings, the reference numbers: 1. a base; 2. a main shaft; 3. a grinding disc; 4. a support; 5. swinging arms; 6. a height-adjusting sliding block; 7. a locking bolt; 8. a push rod; 9. an upper slide block; 10. pushing the shaft; 11. a reciprocating sliding table; 12. a first screw rod; 13. a sub-chassis; 14. a first stepping motor; 15. an optical axis; 16. a damper; 17. a platform; 18. a slide rail; 19. a second screw rod; 20. a second stepping motor; 21. a screw nut seat; 22. a sliding table; 23. a first screw rod; 24. pressing a plate; 25. a column; 26. a main shaft bracket; 27. and a second screw.

Detailed Description

In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The invention may be embodied in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.

Examples

As shown in fig. 1 to 4, a metal mold machining grinder comprises a base 1, a main shaft 2 and a grinding disc 3, wherein the base 1 is provided with a base and a liftable rack, the main shaft 2 is installed on the rack, the grinding disc 3 is concentrically installed on an output shaft of the main shaft 2, and the end surface of the grinding disc 3 is vertically arranged; the grinding machine also comprises a support 4, two swing arms 5, a height adjusting assembly, a loading sliding table and a reciprocating mechanism, wherein the support 4 is arranged on a base of the base 1, rotating shafts are arranged at the front end and the rear end of the support 4, the two rotating shafts are coaxial, the axes of the two rotating shafts are parallel to the axis of the grinding disc 3 and are positioned under the axis of the grinding disc 3, the height adjusting assembly is arranged at the lower parts of the two swing arms 5, the height adjusting assembly of the two swing arms 5 is respectively and rotatably connected with the rotating shafts at the front end and the rear end of the support 4, the loading sliding table is arranged at the top ends of the two swing arms 5 and is used for clamping a workpiece, the reciprocating mechanism is arranged on a frame of the base 1 and is in transmission connection with the upper parts of the two swing arms 5, and the reciprocating mechanism drives the two swing arms 5 to swing left and right to enable the workpiece to swing and grind along an arc line back and forth; the height-adjusting assembly comprises two height-adjusting sliders 6, a plurality of locking bolts 7 and two push rods 8, vertical sliding grooves are formed in the lower portions of the two swing arms 5, the two height-adjusting sliders 6 are respectively and slidably mounted in the sliding grooves of the two swing arms 5, the two height-adjusting sliders 6 are respectively and rotatably connected with rotating shafts at the front end and the rear end of the support 4, the two height-adjusting sliders 6 are respectively provided with the two locking bolts 7, the locking bolts 7 lock the relative positions of the two height-adjusting sliders 6 and the two swing arms 5, the fixed ends of the two push rods 8 are respectively mounted on the side walls of the two swing arms 5, and the moving ends of the two push rods 8 are respectively connected with the two height-adjusting sliders 6; the reciprocating mechanism comprises two upper sliders 9, a push shaft 10, a reciprocating sliding table 11, a first screw rod 12, a secondary frame 13, a first stepping motor 14 and an optical axis 15, wherein vertical slideways are arranged on the upper portions of the two swing arms 5, the two upper sliders 9 are respectively installed in the slideways of the two swing arms 5 in a sliding manner, two ends of the push shaft 10 are respectively connected with the two upper sliders 9 in a rotating manner, the reciprocating sliding table 11 is installed in the middle of the push shaft 10 in a rotating manner, the first screw rod 12 is connected with the reciprocating sliding table 11 through screw rod nuts in a transmission manner, one end of the first screw rod 12 is connected with a frame of the base 1 in a rotating manner, the other end of the first screw rod 12 is connected with the secondary frame 13 in a rotating manner, the secondary frame 13 is vertically installed on the base of the base 1, the first stepping motor 14 is installed on the secondary frame 13, an output shaft of the first stepping motor 14 is connected with the first screw rod 12 in a concentric transmission manner, two ends of the optical axis 15 are respectively installed on the secondary frame 13 and the frame of the base 1, and the middle of the optical axis 15 is connected with the reciprocating sliding manner; the loading sliding table comprises a platform 17, two sliding rails 18, a second screw rod 19, a second stepping motor 20, a screw rod nut seat 21, a sliding table 22, a first screw rod 23 and a pressing plate 24, the platform 17 is installed at the top ends of two swing arms 5, the two sliding rails 18 are installed on the upper end face of the platform 17 in parallel, two ends of the second screw rod 19 are installed at the front end and the rear end of the platform 17 through vertical plates in a rotating mode respectively, the second stepping motor 20 is installed on one vertical plate, an output shaft of the second stepping motor 20 is in transmission connection with the second screw rod 19, the sliding table 22 is installed on the two sliding rails 18 in a sliding mode through a plurality of sliding blocks, the sliding table 22 is in transmission connection with the second screw rod 19 through a screw rod nut in the screw rod nut seat 21, backup plates are arranged at the front end and the rear end of the sliding table 22, the middle of the first screw rod 23 is in rotating threaded connection with one backup plate of the sliding table 22, the pressing plate 24 is installed at the inner end of the first screw rod 23, and a hand wheel is installed at the outer end of the first screw rod 23; the frame of the base 1 comprises two upright posts 25, a main shaft frame 26 and two screw rods 27, wherein the two upright posts 25 are respectively provided with a vertical guide groove, the front end and the rear end of the main shaft frame 26 are respectively slidably mounted in the guide grooves of the two upright posts 25, the main shaft 2 is mounted on the main shaft frame 26, the two screw rods 27 are respectively vertically and rotatably mounted in the two upright posts 25, and the two screw rods 27 are respectively rotatably screwed with the front end and the rear end of the main shaft frame 26;

when in grinding work, a workpiece is placed on the sliding table 22, the first screw 23 is rotated to enable the pressing plate 24 to clamp the workpiece, the two push rods 8 are operated to synchronously extend or shorten according to the diameter of a circular arc curved surface designed by the workpiece, the two heightening slide blocks 6 move up and down in the sliding grooves of the two swing arms 5, the distance from the center of the rotating shaft of the support 4 to the processing surface of the workpiece is matched with the diameter, after the heightening is completed, the locking bolts 7 are screwed down to lock the positions of the two swing arms 5 and the two heightening slide blocks 6, the main shaft 2 is started, the main shaft 2 drives the grinding disc 3 to rotate at high speed, the first stepping motor 14 is started, the first stepping motor 14 drives the first screw rod 12 to reciprocate and rotate forwards and backwards, the first screw rod 12 drives the reciprocating sliding table 11 and the pushing shaft 10 to reciprocate along the optical axis 15 through screw rod nuts, the pushing shaft 10 drives the two swing arms 5 to reciprocate through the two upper slide blocks 9, and in the swinging process, the two upper sliding blocks 9 slide back and forth in the slide ways of the two swing arms 5, so that the two swing arms 5 drive the loading sliding table and the workpiece to swing left and right in a reciprocating manner, a contact surface of a workpiece blank and the rotating grinding disc 3 is an arc curved surface, the two screw rods 27 are rotated, the main shaft frame 26 moves downwards along the guide grooves of the two upright posts 25, so that the grinding disc 3 is in contact with the surface of the workpiece, the height of the main shaft frame 26 is gradually reduced in the grinding process, the grinding feed amount is controlled, the grinding disc 3 grinds the workpiece to form a convex arc curved surface, the two stepping motors 20 are started simultaneously, the two stepping motors 20 drive the two screw rods 19 to rotate, the two screw rods 19 drive the sliding table 22 to move along the two slide rails 18 through the screw rod nut seat 21, so that the whole processing surface of the workpiece is ground by the grinding disc 3, automatic processing is realized, and the equipment is closed after grinding is finished, and rotating the first screw rod 23 to release the pressure plate 24 to take the workpiece out.

As shown in fig. 1 to 4, the utility model discloses a metal mold processing grinding machine, it is at the during operation, at first with work piece blank clamping to slip table 22 on, later two push rods 8 are adjusted according to the diameter of the circular arc curved surface of work piece design, make the distance of the machined surface of support 4 center to the work piece match with above-mentioned diameter, then start main shaft 2, main shaft 2 drives mill 3 and rotates at a high speed, start step motor 14, step motor 14 drives lead screw 12 and reciprocates just reverse, make lead screw 12 drive reciprocal slip table 11 and push shaft 10 along optical axis 15 reciprocating motion through the screw-nut, push shaft 10 drives two swing arms 5 through two top shoe 9 and carries out reciprocating swing, thereby make the work piece blank that loads on the slip table along arc swing back and forth, make work piece blank and pivoted mill 3's contact surface be the circular arc curved surface, thereby make mill 3 grind the work piece out convex circular arc curved surface, the grinding processing is accomplished at last, it loosens clamp plate 24 to rotate screw 23, take off the work piece.

The utility model discloses the main function who realizes does: the requirement of processing the arc curved surface on a flat plate or a block-shaped workpiece in the metal die processing is met, the processing precision is high, and the practicability is high.

The installation mode, the connection mode or the setting mode of the metal mold processing grinding machine of the utility model are common mechanical modes, and the metal mold processing grinding machine can be implemented as long as the beneficial effects can be achieved; the utility model discloses a base 1, main shaft 2, mill 3, push rod 8, push shaft 10, screw-nut, a lead screw 12, a step motor 14, optical axis 15, attenuator 16, slide rail 18, two 19 of lead screw, two 20 of step motor, screw-nut seat 21, screw rod 23, two 27 are the purchase on the market, this industry technical staff only need according to its subsidiary operating specification install and operate can, and need not the technical staff in the field and pay out creative work.

All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims (6)

1. A metal mold machining grinder comprises a base (1), a main shaft (2) and a grinding disc (3), wherein the base (1) is provided with a base and a liftable rack, the main shaft (2) is installed on the rack, the grinding disc (3) is concentrically installed on an output shaft of the main shaft (2), and the end face of the grinding disc (3) is vertically arranged; the grinding machine is characterized by further comprising a support (4), two swing arms (5), a heightening assembly, a loading sliding table and a reciprocating mechanism, wherein the support (4) is installed on a base of the base (1), rotating shafts are arranged at the front end and the rear end of the support (4), the two rotating shafts are coaxial, the axes of the two rotating shafts are parallel to the axis of the grinding disc (3) and are located under the axis of the grinding disc (3), the heightening assembly is installed at the lower portion of each swing arm (5), the heightening assemblies of the two swing arms (5) are respectively connected with the rotating shafts at the front end and the rear end of the support (4) in a rotating mode, the loading sliding table is installed at the top ends of the two swing arms (5), the loading sliding table is used for clamping a workpiece, the reciprocating mechanism is installed on a rack of the base (1), the reciprocating mechanism is connected with the upper portions of the two swing arms (5) in a transmission mode, and the reciprocating mechanism drives the two swing arms (5) to swing left and right, so that the workpiece is ground along an arc line.

2. The metal mold machining grinding machine according to claim 1, characterized in that the height adjusting assembly comprises two height adjusting sliders (6), a plurality of locking bolts (7) and two push rods (8), the lower parts of the two swing arms (5) are respectively provided with a vertical chute, the two height adjusting sliders (6) are respectively slidably mounted in the chutes of the two swing arms (5), the two height adjusting sliders (6) are respectively rotatably connected with the rotating shafts at the front end and the rear end of the support (4), the two height adjusting sliders (6) are respectively provided with two locking bolts (7), the locking bolts (7) lock the relative positions of the two height adjusting sliders (6) and the two swing arms (5), the fixed ends of the two push rods (8) are respectively mounted on the side walls of the two swing arms (5), and the moving ends of the two push rods (8) are respectively connected with the two height adjusting sliders (6).

3. The metal mold machining grinding machine according to claim 1, characterized in that the reciprocating mechanism comprises two upper sliders (9), a push shaft (10), a reciprocating sliding table (11), a first screw rod (12), a sub-frame (13), a first stepping motor (14) and an optical axis (15), wherein vertical slideways are arranged on the upper portions of the two swing arms (5), the two upper sliders (9) are respectively and slidably mounted in the slideways of the two swing arms (5), two ends of the push shaft (10) are respectively and rotatably connected with the two upper sliders (9), the reciprocating sliding table (11) is rotatably mounted in the middle of the push shaft (10), the first screw rod (12) is in transmission connection with the reciprocating sliding table (11) through a screw nut, one end of the first screw rod (12) is rotatably connected with the frame of the base (1), the other end of the first screw rod (12) is rotatably connected with the sub-frame (13), the sub-frame (13) is vertically mounted on the base of the base (1), the first stepping motor (14) is mounted on the sub-frame (13), an output shaft of the first stepping motor (14) is connected with the transmission shaft (12), the optical axis (15) is concentrically mounted on the frame and the optical axis (15) is connected with the base (15).

4. A metal mold machining grinder as claimed in claim 3, characterized by further comprising two dampers (16), one ends of the two dampers (16) being rotatably connected to the two upper blocks (9), respectively, and the other ends of the two dampers (16) being rotatably connected to the frame of the base (1).

5. The metal mold machining grinding machine according to claim 1, characterized in that the loading sliding table comprises a platform (17), two sliding rails (18), a second screw rod (19), a second stepping motor (20), a screw rod nut seat (21), a sliding table (22), a first screw rod (23) and a pressing plate (24), the platform (17) is installed at the top ends of two swing arms (5), the two sliding rails (18) are installed on the upper end face of the platform (17) in parallel, two ends of the second screw rod (19) are installed at the front end and the rear end of the platform (17) through vertical plate rotation respectively, the second stepping motor (20) is installed on one vertical plate, an output shaft of the second stepping motor (20) is in transmission connection with the second screw rod (19), the sliding table (22) is installed on the two sliding rails (18) through a plurality of sliding blocks in a sliding mode, the sliding table (22) is in transmission connection with the second screw rod (19) through a screw rod nut in the screw rod nut seat (21), the front end and the rear end of the sliding table (22) are provided with backup plates, the middle of the first screw rod (23) is in rotation in threaded connection with one backup plate, and the outer end of the pressing plate (23) is provided with the inner end of a hand wheel (23).

6. The metal mold machining grinder according to claim 1, characterized in that the frame of the base (1) comprises two upright posts (25), a main shaft frame (26) and two second screws (27), wherein the two upright posts (25) are provided with vertical guide grooves, the front end and the rear end of the main shaft frame (26) are respectively slidably mounted in the guide grooves of the two upright posts (25), the main shaft (2) is mounted on the main shaft frame (26), the two second screws (27) are respectively vertically and rotatably mounted in the two upright posts (25), and the two second screws (27) are respectively rotatably screwed with the front end and the rear end of the main shaft frame (26).

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