CN115741253A - Hob grinding machine - Google Patents

Abstract

The invention provides a hob grinding machine which is used for grinding a hob, wherein a plurality of rotary cutting edges are arranged on the hob at intervals, and an edge valley is formed between every two adjacent rotary cutting edges; the hob grinder further comprises: a first positioning assembly configured to position the hob in an axial direction to form an axial positioning state in which the hob is rotatable about its axis; and a second positioning assembly configured to position the hob in a circumferential direction to form a circumferential positioning state in which the hob can maintain contact of the rotary cutting edge thereof with the grinding wheel to grind the rotary cutting edge in an extension direction of the rotary cutting edge; wherein the first positioning assembly is engaged on the table in a manner of being capable of reciprocating in the axial direction, and the second positioning assembly is engaged on the table in a manner of being stationary relative to the table in the axial direction. The hob grinding machine provided by the invention can realize automatic grinding of the hob, and has the advantages of high positioning accuracy, good grinding effect and high efficiency.

Description

Hob grinding machine

Technical Field

The invention relates to the technical field of automatic grinding equipment, in particular to a hob grinding machine.

Background

A hob is a tool that performs cutting during relative contact rotation with an object being cut. The hob is usually cylindrical and has a cutting edge machined into its peripheral wall, which is often helical. The blade edge typically needs to be ground after forming to increase its sharpness. Because the cutting edge of the hob is usually spiral, the grinding difficulty is high. The prior art generally uses a hand-held power grinding wheel that travels along the rotary cutting edge to perform the grinding; or a handheld or semi-automatic tool is used for clamping the hobbing cutter, and the hobbing cutter is rotated to enable the rotary cutting edge to move on the electric grinding wheel for grinding. However, in the prior art, when the hob is polished, the precision of the travel along the rotary cutting edge is low, the polishing efficiency is low, and the danger is high.

In view of the above, there is a need to provide a new technical solution to overcome the problems in the prior art.

Disclosure of Invention

The invention provides a hob grinding machine which can realize automatic grinding of hobs and has the advantages of high positioning accuracy, good grinding effect and high efficiency.

In order to achieve the purpose, the technical scheme adopted by the invention is as follows: a hob grinding machine is used for grinding a hob, a plurality of rotary cutting edges are arranged on the hob at intervals, an edge valley is formed between every two adjacent rotary cutting edges, and the hob grinding machine comprises a workbench and a grinding wheel; wherein, hob grinder still includes:

a first positioning assembly configured to position the hob in an axial direction to create an axial positioning state in which the hob can rotate about its axis; and

a second positioning assembly configured to position the hob in a circumferential direction to form a circumferential positioning state in which the hob can maintain contact of its rotary cutting edge with the grinding wheel to grind the rotary cutting edge in an extension direction of the rotary cutting edge;

wherein the first positioning assembly is engaged on a table in a manner to be reciprocally movable in the axial direction, and the second positioning assembly is engaged on the table in a manner to be stationary relative to the table in the axial direction.

Optionally, the rotary cutting edge is helical and extends in both the axial direction and the circumferential direction.

Optionally, the first positioning component comprises: the sliding table is arranged on the workbench through a sliding structure; the positioning shaft is arranged on the sliding table and can move along with the sliding table; the positioning rod is arranged on the sliding table and can move along with the sliding table; the positioning shaft is configured to rotate around the axis of the positioning shaft, and the hob is detachably sleeved on the positioning shaft and can drive the positioning shaft to rotate; wherein the positioning rod has an end portion abutting against the positioning shaft, the abutment being arranged to allow the positioning shaft to rotate while restricting movement of the positioning shaft in a radial direction thereof.

Optionally, the second positioning assembly comprises a floating positioning member configured to float up to a height opposite to a front end of the edge valley before being inserted into the edge valley of the hob and to move down to a height contacting an inner bottom surface of the edge valley after being inserted into the edge valley.

Optionally, the floating positioning member is tensioned by an elastic member to be in close contact with the inner bottom surface of the blade valley.

Optionally, the bottom of the floating positioning piece is connected with a roller, the hob grinder comprises a stepped shaft with transverse reciprocating motion, the thick section of the stepped shaft is inserted into the roller below to drive the floating positioning piece to float upwards, and the thin section of the stepped shaft is inserted into the roller below to drive the floating positioning piece to move downwards.

Optionally, the stepped shaft and the positioning rod are fixed to the same sliding table.

Optionally, the second positioning assembly includes a fixing positioning element, and in the circumferential positioning state, the fixing positioning element is vertically inserted into one blade valley of the hob, and the floating positioning element is transversely inserted into another blade valley of the hob.

Optionally, the hob grinding machine includes an indexing post rod, the indexing post rod abuts against the inside of the edge valley, the positioning shaft drives the hob to move in a feeding manner along the axial direction, and the hob which moves in the feeding manner is driven to rotate for indexing of a rotary cutting edge by the relative sliding of the indexing post rod in the edge valley.

Optionally, the hob grinding machine further comprises a pre-positioning ejector rod, a station of the pre-positioning ejector rod is located before a station of the indexing ejector rod, and the pre-positioning ejector rod is configured to push the hob to rotate so as to adjust an initial angle of the hob.

Optionally, a concave hole is formed in an end face of the positioning shaft, which is abutted to the positioning rod, and an apex inserted into the concave hole is arranged at the end of the positioning rod.

According to the hob grinding machine provided by the invention, the hob is positioned in an axial positioning state through the first positioning assembly, the hob is positioned in a circumferential positioning state through the second positioning assembly, the hob is driven by the first positioning assembly and the second positioning assembly to perform translational movement in the axial direction and simultaneously perform rotational movement around the axis of the hob, and the grinding wheel is kept in contact with the rotary cutting edge of the hob for grinding in the translational movement and the rotational movement processes of the hob, so that the hob is automatically ground, and the hob grinding machine is high in positioning accuracy, good in grinding effect and high in efficiency.

Drawings

To illustrate the technical solutions of the embodiments of the present invention more clearly, the drawings of the embodiments will be briefly introduced, and it is obvious that the drawings in the following description only relate to some embodiments of the present invention, and are not to limit the present invention.

FIG. 1 is a perspective view of one embodiment of the hob grinding machine of the present invention.

FIG. 2 is a perspective view of the internal structure of one embodiment of the hob grinder of the present invention.

FIG. 3 is a top view of the internal structure of one embodiment of the hob grinding machine of the present invention.

Fig. 4 is a perspective view of a hob feeding mechanism in an embodiment of the hob grinding machine of the present invention.

FIG. 5 is a perspective assembly view of the components that accomplish hob positioning in one embodiment of the hob grinding machine of the present invention.

Fig. 6 is an exploded perspective view of a portion of the components shown in fig. 5.

Fig. 7 is a partial cross-sectional view of the first positioning assembly of fig. 5.

Fig. 8 is a perspective view of a grinding wheel in an embodiment of the hob grinding machine of the present invention.

Fig. 9 is a perspective view of a hob blanking mechanism in an embodiment of the hob grinding machine of the present invention.

Fig. 10 is a perspective view of a hob suitable for grinding by the hob grinding machine of the present invention.

Reference numerals: 100-hob grinding machine; 1-positioning the shaft drive; 11-a drive shaft; 110-a limiting hole; 111-a ball bearing; 12-positioning the shaft; 120-a ring groove; 121-equal diameter section; 122-a variable diameter section; 123-concave hole; 14-a slide table; 15-positioning rods; 151-centre; 16-a stepped shaft; 17-a workbench; 2-a hob feeding mechanism; 21-a conveying pipe; 22-a clamp; 221-a wedge block; 23-a wedge bar; 24-a slide mount; 251-a detection element; 252-a sensing element; 261-a first drive member; 262-a second drive member; 27-an elastic return member; 3-pre-positioning the ejector rod; 4-indexing ejector rods; 5-a circumferential positioning assembly; 51-a floating spacer; 511-a roller; 512-a movable connection; 513-a floating guide bar; 514-fixed connection seat; 52-a fixed positioning element; 521-fixed guide bar; 6-hob blanking mechanism; 61-a guide rail; 610-front port; 611-bottom wall; 612-a sidewall; 6121-a stopper; 613-notch; 614-rear port; 62-a conveyor belt assembly; 621-rack driving cylinder; 622-rack; 623-a driving gear; 624-driven wheel; 625-a conveyor belt; 63-a tail stop; 65-a third drive member; 7-grinding the wheel; 8-hob cutter; 801-shaft hole; 81-rotary cutting edge; 82-edge valley.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention will be further described in detail with reference to the accompanying drawings. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

Unless defined otherwise, technical or 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 use of "first," "second," and similar terms in the description and claims of this patent does not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a," "an," or "the" and similar referents do not denote a limitation of quantity, but rather denote the presence of at least one. The word "comprising" or "comprises", and the like, means that the element or item appearing in front of the word "comprising" or "comprises" includes the element or item listed after the word "comprising" or "comprises" and its equivalents, and does not exclude other elements or items. "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like are used only to indicate relative positional relationships that may change when the absolute position of an object being described is changed, and are merely for convenience in describing the invention and to simplify the description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Some embodiments of the invention are described in detail below with reference to the accompanying drawings. Features in the embodiments described below may be combined with each other without conflict.

Referring to fig. 1 to 10, the present invention provides a hob grinding machine 100, which is used for grinding a hob 8 and can realize automatic feeding, precise positioning, automatic grinding and automatic discharging of the hob 8, wherein the hob grinding machine 100 includes a worktable 17, a grinding wheel 7, a hob feeding mechanism 2, a positioning component for positioning the hob 8 during grinding, and a hob discharging mechanism 6 for removing the ground hob 8. It is understood that the names of the hob feeding mechanism 2, the positioning assembly and the hob blanking mechanism 6 are generalized and described according to the action process achieved by matching a plurality of components or structures as a whole, and the components included in the hob feeding mechanism 2, the positioning assembly and the hob blanking mechanism 6 are not necessarily the same, and may include one or more of the same components or structures. The hob grinder 100 of the present application is described in detail below.

First, the structure of the hob 8 ground by the hob grinding machine 100 applied to the present invention will be described below. Referring to fig. 10, the hob 8 is a cylinder, the center of which is provided with a shaft hole 801, the circumferential wall surface of which is provided with a plurality of spiral rotary cutting edges 81 arranged at intervals, a spiral valley 82 is formed between adjacent rotary cutting edges 81, and both the rotary cutting edges 81 and the valley 82 extend along the axial direction and the circumferential direction of the hob 8. In this embodiment, each of the helical cutting edges 81 is less than one turn, and even less than half a turn. The shapes and the sizes of the two ends of the hob 8 are different, and the hob 8 needs to feed in a specific direction when feeding.

The hob feeding mechanism 2 and the hob feeding process of the hob grinding machine 100 of the present application are described below with reference to fig. 1 to 4. The hob feeding mechanism 2 is used for installing the hob 8 on a positioning shaft 12, the positioning shaft 12 is driven by a positioning shaft driving part 1 to move forward and backward along the axial direction of the positioning shaft, and the hob feeding mechanism 2 comprises a radial transfer assembly and an axial tightening assembly. The radial transfer assembly is arranged beside the axis direction of the positioning shaft 12 and is configured to clamp the hob 8 and transfer the hob 8 to the axis of the positioning shaft 12 along the radial direction, so that the shaft hole 801 of the hob 8 is opposite to the positioning shaft 12; the positioning shaft driving part 1 is configured to drive the positioning shaft 12 to move forwards along the axial direction thereof so as to be pre-inserted into the shaft hole 801 of the hob 8; the axial tightening assembly is configured to drive the hob 8 to move axially along the positioning shaft 12 to tighten the hob 8 on the positioning shaft 12 in an interference fit after the positioning shaft 12 is pre-inserted with the hob 8; the positioning shaft 12 is configured to be driven to rotate about its axis by the roller cutter 8 interference sleeved thereon.

Referring to fig. 7, the positioning shaft 12 includes a constant diameter section 121 with a constant diameter and a reducing section 122 connected to the constant diameter section 121 and having a gradually increasing diameter, during the feeding process of the hob, the positioning shaft driving member 1 drives the positioning shaft 12 to move axially, so that the constant diameter section 121 of the positioning shaft 12 is inserted into the shaft hole 801 of the hob 8, and then the axial tightening assembly drives the hob 8 to further engage with the reducing section 122 of the positioning shaft 12 in an interference manner, so as to tighten the positioning shaft 12. That is, the end of the self-positioning shaft 12 for the hob 8 to be sleeved in is inwards and sequentially comprises an equal-diameter section 121 and a variable-diameter section 122; the tight sleeving of the positioning shaft 12 and the hob 8 requires two-step sleeving action, the first step of sleeving is the movement of the positioning shaft 12, at this time, the constant diameter section 121 of the positioning shaft 12 is inserted into the shaft hole 801 of the hob 8, the diameter of the constant diameter section 121 is slightly smaller than that of the shaft hole 801, so that the positioning shaft and the hob are in clearance or transition fit, and the fit mainly plays a role in pre-inserting positioning but does not play a role in circumferentially fixing the positioning shaft and the hob; the second step of sleeving is that the hob 8 moves, at this time, the hob 8 is sleeved on the reducer section 122, and because the diameter of the reducer section 122 is gradually increased, the hob 8 is tighter and tighter, and the matching on the reducer section 122 mainly plays a role in enabling the hob 8 and the reducer section to be relatively fixed in the circumferential direction, so that the hob and the reducer section are prevented from rotating relatively.

With continued reference to fig. 7, the positioning shaft driving member 1 includes a driving shaft 11 sleeved outside one end of the positioning shaft 12, the positioning shaft 12 and the driving shaft 11 are relatively fixed in the axial direction, and the positioning shaft 12 is capable of rotating around an axis relative to the driving shaft 11. The side wall of the driving shaft 11 is provided with a radially through limiting hole 110, the positioning shaft 12 is provided with an annular groove 120 corresponding to the limiting hole 110, and a limiting member which protrudes into the annular groove 120 to limit the relative displacement of the positioning shaft 12 and the driving shaft 11 in the axial direction is installed in the limiting hole 110, for example, a screw, a pin, and the like. The driving shaft 11 is further provided with a ball 111, the ball 111 abuts against an end surface of the positioning shaft 12, and the ball 111 is arranged to make the rotation of the positioning shaft 12 relative to the driving shaft 11 smoother. After the hob 8 is tightly sleeved on the positioning shaft 12, the positioning shaft 12 and the hob 8 rotate synchronously to realize the subsequent grinding process. In this embodiment, the positioning shaft 12 is driven by the hob 8 to rotate.

Referring to fig. 2 to 4, the radial transfer assembly includes a sliding seat 24, a clamping member 22 mounted on the sliding seat 24 for clamping the hob 8, and a first driving member 261 for driving the sliding seat 24 and the clamping member 22 mounted thereon to move synchronously along the radial direction of the positioning shaft 12.

After being regulated by the regulating mechanism, the roller cutters 8 are sequentially arranged in the conveying pipe 21 along the axial direction of the roller cutters 8 and are conveyed to the clamping part 22 one by one. The structure at hobbing cutter 8 both ends is different, holder 22 has the centre gripping chamber that holds hobbing cutter 8, the centre gripping chamber disposes and holds one of them tip of hobbing cutter 8 can not hold the detection chamber of another tip of hobbing cutter 8, detects the intracavity disposes and detects whether the tip of hobbing cutter 8 gets into the detector that detects the chamber. If the end part of the hob 8 does not enter the detection cavity of the clamping piece 22, the feeding direction of the hob 8 is judged to be wrong, an alarm is given, and feeding is stopped. Specifically, 8 both ends of hobbing cutter can set up to an end diameter and be greater than another tip diameter, detect the chamber and set up to its size and be greater than the less tip of 8 diameters of hobbing cutter, and be less than the great tip of 8 diameters of hobbing cutter, so, when hobbing cutter 8 feeds forward with the less tip of diameter, can feed in place, when feeding forward with the great tip of diameter, then unable feeding in place, the detector detects this situation, can report to the police and stop the feeding.

An elastic restoring member 27 is connected to the clamping member 22, the elastic restoring member 27 applies force to the clamping member 22 so that the clamping member 22 is maintained at an initial position, and the clamping member 22 is configured to be movable relative to the sliding seat 24 in the axial direction of the positioning shaft 12 to either side of the initial position. A guide shaft is arranged between the clamping piece 22 and the sliding seat 24, the clamping piece 22 slides on the sliding seat 24 along the guide shaft, and the elastic resetting piece 27 is sleeved on the guide shaft. In this embodiment, the elastic restoring member 27 is two springs, which are disposed at the left and right sides of the clamping member 22, and when the clamping member 22 is moved to one side by an external force, the spring at the side is pressed, and the compressed spring provides a restoring force for returning the clamping member 22 to an initial position when the external force is not applied.

The clamping piece 22 is arranged to move towards any side of the initial position, and therefore whether the feeding process of the hob 8 is normal or not can be judged according to the movement condition of the clamping piece 22. Specifically, the sensing element 252 is installed on the clamping member 22, the detecting element 251 which is matched with the sensing element 252 is installed on the sliding seat 24, and the detecting element 251 is matched with the sensing element 252 to detect whether the clamping member 22 moves away from the initial position or not. Wherein the detection element 251 and the sensing element 252 are configured to: when the clamping member 22 is pushed by the pre-insertion movement of the positioning shaft 12 to deviate from the initial position, the detecting element 251 and the sensing element 252 are misaligned relative to the initial position, thereby triggering an alarm and stopping a feeding command. Referring to fig. 4, after the clamping member 22 clamps the hob 8 and moves radially to the axis of the positioning shaft 12, the positioning shaft driving member 1 drives the positioning shaft 12 to move forward along the axial direction thereof, i.e. to move in the right direction indicated in fig. 4. When the shaft hole 801 of the hob 8 is located at a position opposite to the axis of the positioning shaft 12 and the size of the shaft hole 801 is matched with the size of the positioning shaft 12, the pre-insertion action of the positioning shaft 12 does not push the clamping member 22 for clamping the hob 8 to move rightwards, which is the normal pre-insertion action in the feeding process. When the position of the shaft hole 801 of the hob 8 deviates from the axis of the positioning shaft 12, or the hole diameter of the shaft hole 801 of the hob 8 is smaller due to machining size errors, the positioning shaft 12 cannot be inserted into the shaft hole 801 during pre-insertion, so that the rightward movement of the positioning shaft 12 pushes the clamping piece 22 for clamping the hob 8 to move rightward, which is abnormal pre-insertion during feeding; at this time, the detecting element 251 and the sensing element 252 are dislocated, and if the pre-insertion motion of the positioning shaft 12 is determined to be abnormal, an alarm is triggered and a feeding instruction is stopped.

With continued reference to fig. 4, the clamping member 22 is configured to move to the left of the initial position, so that after the pre-insertion action, the clamping member 22 is driven to drive the hob 8 to move to the left along the axial direction of the positioning shaft 12 to be tightly sleeved with the positioning shaft 12. Specifically, the axial tightening assembly comprises a second driving assembly mounted on the sliding seat 24, and the second driving member pushes the clamping member 22 to move from the initial position to a direction opposite to the moving direction of the positioning shaft 12 during pre-insertion so as to tighten the hob 8 on the positioning shaft 12. The second driving assembly comprises a second driving part 262 and a wedge rod 23, a wedge block 221 is arranged on the clamping part 22, the second driving part 262 pushes the wedge rod 23 to move, and the wedge rod 23 pushes the wedge block 221 to drive the clamping part 22 to move. The cooperation between the detecting element 251 and the sensing element 252 can also be used to detect whether the tightening action is normal. Specifically, when the second driving assembly drives the clamping member 22 to move leftward, if a deviation occurs between the detecting element 251 and the sensing element 252 due to the leftward movement, it is determined that the tightening operation is normal; if the deviation caused by leftward movement does not occur between the detecting element 251 and the sensing element 252 or the deviation amount is smaller than a preset value, it is determined that the tightening action is abnormal, and an alarm is given and the feeding is stopped.

The positioning process of the hob 8 in the grinding process of the hob grinding machine 100 according to the present application is described below with reference to fig. 2, 3, 5 to 7. The hob grinder 100 includes a table 17 and a grinding wheel 7, as well as a first positioning assembly and a second positioning assembly. The first positioning assembly is configured to position the hob 8 in an axial direction of the positioning shaft 12 to form an axial positioning state in which the hob 8 can rotate about its axis; the second positioning member is configured to position the hob 8 in the circumferential direction of the positioning shaft 12 to form a circumferential positioning state in which the hob 8 can maintain the contact of the rotary cutting edge 81 thereof with the grinding wheel 7 to grind the rotary cutting edge 81 in the extending direction of the rotary cutting edge 81. Wherein the first positioning assembly is engaged on the table 17 in such a manner as to be reciprocally movable in the axial direction, and the second positioning assembly is engaged on the table 17 in such a manner as to be stationary with respect to the table 17 in the axial direction.

The first positioning assembly includes a slide table 14, a positioning shaft 12, and a positioning rod 15. The sliding table 14 is arranged on the workbench 17 through a sliding structure; the positioning shaft 12 is arranged on the sliding table 14 and can move along with the sliding table 14; the positioning rod 15 is provided on the slide table 14, and is movable following the slide table 14. The positioning shaft 12 is configured to rotate around its axis as described above, and the hob 8 is detachably sleeved on the positioning shaft 12 and can drive the positioning shaft 12 to rotate. The positioning rod 15 has an end portion abutting against the positioning shaft 12, the abutment being provided to allow the positioning shaft 12 to rotate while restricting the positioning shaft 12 from moving in a radial direction thereof. The positioning rod 15 is abutted against the positioning shaft 12, so that the problems that the positioning shaft 12 is suspended at one end, so that the flexibility is large, and the deviation is easy to occur in the radial direction in the grinding process can be avoided, the position precision of the positioning shaft 12 is higher, and the grinding precision of the hob 8 sleeved on the positioning shaft is high. Specifically, a concave hole 123 is formed in the end face of the positioning shaft 12, which is in contact with the positioning rod 15, and the end of the positioning rod 15 is an apex 151 inserted into the concave hole 123.

The second positioning member is a circumferential positioning member 5 for realizing circumferential positioning, and includes a floating positioning member 51, and the floating positioning member 51 is configured to float up to a height opposite to the front end of the valley 82 before being inserted into the valley 82 of the hob 8, and to move down to a height contacting with the inner bottom surface of the valley 82 after being inserted into the valley 82. The setting of second locating component can be with hobbing cutter 8's translational motion transform into hobbing cutter 8's rotary motion, and it needs to keep continuous contact with one of two groove lateral walls of sword millet 82, otherwise can't provide the rotatory external force of hobbing cutter 8, and insert sword millet 82 through the front end of sword millet 82 at second locating component if keep in contact promptly at first, then can make to insert the cooperation difficulty, probably leads to second locating component to insert and go in not arriving sword millet 82. The present embodiment overcomes the above problems by providing the floating and downward movement of the floating spacer 51. Further, the floating positioning member 51 is tightened by an elastic member to be in close contact with the inner bottom surface of the valley 82. In one embodiment, a roller 511 is connected to the bottom of the floating positioning member 51, the hob grinding machine 100 includes a stepped shaft 16 that reciprocates transversely, the thick section of the stepped shaft 16 is inserted below the roller 511 to drive the floating positioning member 51 to move upwards, and the thin section of the stepped shaft 16 is inserted below the roller 511 to move the floating positioning member 51 downwards; it can be understood that, in order to make the upward and downward movement of the roller 511 smooth, the thick section and the thin section of the stepped shaft 16 are connected by a transition section in the shape of a truncated cone. The floating positioning member 51 comprises a floating guide rod 513, a fixed connecting seat 514 and a movable connecting part 512, wherein the floating guide rod 513 is fixed at the upper end of the movable connecting part 512, the roller 511 is installed at the lower end of the movable connecting part 512, and the movable connecting part 512 is pivotally connected to the fixed connecting seat 514. The stepped shaft 16 drives the roller 511, the movable connection member 512 and the floating guide rod 513 to perform reciprocating rotation motion within a certain angle range up and down with respect to the pivotal position with the fixed connection seat 514, so as to achieve floating. Further, the stepped shaft 16 and the positioning rod 15 are fixed on the same sliding table 14, and in the grinding process, the positioning shaft 12, the positioning rod 15 and the stepped shaft 16 move synchronously. In another embodiment, the floating and moving down can also be realized by a matching structure of a push rod and a wedge, specifically, the wedge is connected to the bottom of the floating positioning element 51, and the hob grinding machine 100 includes a push rod which reciprocates transversely to push against the wedge.

The second positioning assembly further comprises a fixed positioning part 52, wherein in the circumferential positioning state, the fixed positioning part 52 is vertically inserted into one edge valley 82 of the hob 8, and the floating positioning part 51 is transversely inserted into the other edge valley 82 of the hob 8. Specifically, the fixed positioning member 52 includes a fixed guide rod 521, the fixed guide rod 521 is inserted into one valley 82 of the hob 8, and the floating guide rod 513 of the floating positioning member 51 is inserted into the other valley 82 of the hob 8. The positioning of the hob 8 is more reliable by positioning two positioning elements floating and fixed in the two edge valleys 82, so that the hob 8 can keep the rotary cutting edge 81 thereof in contact with the grinding wheel 7 to advance along the extension direction of the rotary cutting edge 81.

Referring to fig. 2, 3 and 5, the hob grinding machine 100 further includes an indexing post 4, before each rotary cutting edge 81 is ground, the hob 8 is positioned by the indexing post 4 to a position where the rotary cutting edge 81 to be ground is opposite to the grinding surface of the grinding wheel 7. The indexing push rod 4 is abutted against the inside of the cutting edge valley 82, the positioning shaft 12 drives the hob 8 to move in a feeding manner along the axial direction, and the hob 8 which moves in the feeding manner is driven to rotate for indexing of one rotary cutting edge 81 by the relative sliding of the indexing push rod 4 in the cutting edge valley 82, so that each rotary cutting edge 81 is ground in sequence.

The hob grinding machine 100 further comprises a pre-positioning ejector rod 3, a station of the pre-positioning ejector rod 3 is located in front of a station of the indexing ejector rod 4, and the pre-positioning ejector rod 3 is configured to push the hob 8 to rotate so as to adjust an initial angle of the hob 8. Because the hob 8 is conveyed from the conveying pipe 21 to the clamping member 22, the circumferential state of the hob is uncertain, for example, after the hob 8 is sleeved and fixed on the positioning shaft 12, the position on the circumferential surface of the hob 8, which is directly opposite to the indexing push rod 4, may be a rotary cutting edge 81, may also be an edge valley 82, may be a position close to the upper side of the edge valley 82, and may also be a position close to the lower side thereof, therefore, a pre-positioning push rod 3 is arranged to push the hob 8 to drive the positioning shaft 12 to rotate by an angle, so that the initial state of the hob 8 fed to the indexing push rod 4 is the same, thereby ensuring the accuracy of subsequent grinding. In this embodiment, the pre-positioning jack rod 3 pushes the hob 8 in an upward inclined manner, so as to drive the hob 8 to rotate.

With continued reference to fig. 2, 3 and 5, the grinding process of the hob 8 is as follows: the hob 8 which is subjected to the feeding and positioning is driven by the second positioning assembly to reciprocate on the sliding table 14, the motion of the hob 8 is the rotary motion along the extension direction of the rotary blade 81 while the hob 8 is subjected to the translational motion in the axial direction, in the motion process, the grinding wheel 7 is in contact with the rotary blade 81 of the hob 8 for grinding, and the reciprocating motion completes the grinding of one rotary blade 81 at a time; the hob 8 moves to a position corresponding to the indexing ejector rod 4, and the indexing ejector rod 4 abuts against the wall surface of the hob 8 so as to drive the hob 8 to rotate the indexing of one rotary cutting edge 81 during each abutting; then, the grinding device continues to move in the manner described above to grind the other rotary cutting edge 81; repeating the above steps until all the rotary cutting edges 81 are ground, taking down the hob 8, and then feeding and grinding the next hob 8.

The hob blanking mechanism 6 and the blanking process will be described with reference to fig. 2, 3 and 9. And the hob blanking mechanism 6 is used for taking down the ground hob 8 which is sleeved on the positioning shaft 12 in an interference manner. The hob blanking mechanism 6 includes a guide rail 61 and a third driving member 65 for driving the guide rail 61 to move, the guide rail 61 has a front port 610 for accommodating the hob 8 in the guide rail in a transverse state 61, the front port 610 is provided with a stopping portion 6121 blocked at the end of the hob 8, the positioning shaft 12 drives the hob 8 to move backward along the axial direction of the positioning shaft 12, and the end of the hob 8 impacts the stopping portion 6121 so that the hob 8 falls off from the positioning shaft 12 and enters the guide rail 61. The guide rail 61 includes a bottom wall 611 and a side wall 612, the bottom wall 611 and the side wall 612 form a u shape, and a notch 613 avoiding the positioning shaft 12 is formed on the side wall 612 at the front port 610. The portion of the sidewall 612 around the notch 613 at the front port 610 forms the stop 6121.

Further, the width of the guide rail 61 is equivalent to the axial length of the hob 8, so that the hob 8 can roll in the guide rail 61 and is not easy to turn. Said equivalent includes that the width of the guide rail 61 is equal to or slightly greater than the axial length of the roller cutter 8. In a particular embodiment, the width of guide rails 61 is greater than the axial length of hob 8 and less than the axial diagonal length of hob 8. The guide rails 61 are arranged obliquely downwards from the front port 610 to a rear port 614 opposite the front port 610, so that the roller cutter 8 can roll down by gravity.

Further, the hob blanking mechanism 6 further comprises a tail stopper 63 disposed at the rear port 614 of the guide rail 61, an opening is formed at a lower end of the tail stopper 63, and the hob 8 rolling downward along the guide rail 61 is stopped by the tail stopper 63 to fall from the opening. The hob blanking mechanism 6 further comprises a conveyor belt assembly 62, said conveyor belt assembly 62 being located below said opening, said hob 8 falling from said opening onto said conveyor belt assembly 62. The conveyor belt assembly 62 includes a drive assembly and a conveyor belt 625, the drive assembly driving the conveyor belt 625 to move in steps. The step motion is a motion in which motion, stop, movement, and stop are alternately performed. Specifically, the driving assembly includes a rack driving cylinder 621, a rack 622, a driving gear 623 and a driven wheel 624, the rack driving cylinder 621 drives the rack 622 to reciprocate, the rack 622 is engaged with the driving gear 623, a ratchet structure is arranged in the driving gear 623, forward rotation of the driving gear 623 drives the driven wheel 624 and the conveyor belt 625 to move, and reverse rotation of the driving gear 623 does not drive the driven wheel 624 and the conveyor belt 625 to move.

When all the rotary cutting edges 81 on one hob 8 are ground, the positioning shaft 12 drives the hob 8 to move to a position opposite to the guide rail 61, and the guide rail 61 is driven to move obliquely upwards, so that the hob 8 is partially positioned in the guide rail 61. The guide rail 61 is a strip-shaped groove with a bottom wall 611 and a side wall 612 and in a shape of "U", after the guide rail 61 is moved up and to the right, the positioning shaft 12 moves backward, at this time, the end surface of the hob 8 collides with the side wall 612 of the guide rail 61, falls off from the positioning shaft 12, rolls down along the guide rail 61, is stopped by the tail part 63, and falls onto the conveyor belt 625. The conveyor belt 625 is driven by the combination of the driving gear 623 and the rack 622, the rack 622 is driven by the rack driving cylinder 621 to reciprocate back and forth, the driving gear 623 is matched with the rack 622 and driven by the rack 622 to reciprocate back and forth to alternately move forward and backward, and the driving gear 623 does not drive the driven wheel 624 to rotate when rotating backward, so that the step-by-step transmission of the conveyor belt 625 can be realized, namely, the hob 8 to be ground moves forward one section and stops, and when the hob 8 to be ground falls onto the conveyor belt 625, the hob 8 to be ground moves forward one section and stops again to fall onto the conveyor belt 625.

As can be seen from the above description, in the hob grinding machine 100 provided by the present invention, the hob 8 is positioned in an axial positioning state by the first positioning assembly, the hob 8 is positioned in a circumferential positioning state by the second positioning assembly, the hob 8 is translationally moved in the axial direction and simultaneously rotationally moves around the axis of the hob 8 under the common limitation and driving of the first positioning assembly and the second positioning assembly, and the grinding wheel 7 is in contact with the rotary cutting edge 81 of the hob 8 during the translational movement and the rotational movement of the hob 8 for grinding, so as to automatically grind the hob 8, and the hob grinding machine has the advantages of high positioning accuracy, good grinding effect and high efficiency. The application provides a hob grinding machine 100 can realize automatic feeding, automatic grinding and automatic unloading to hob 8, can realize the full automatization grinding to hob 8.

The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (10)

1. A hob grinding machine is used for grinding a hob, a plurality of rotary cutting edges are arranged on the hob at intervals, an edge valley is formed between every two adjacent rotary cutting edges, and the hob grinding machine comprises a workbench and a grinding wheel; characterized in that, the hob grinding machine further comprises:

a first positioning assembly configured to axially position the hob to form an axially positioned state in which the hob is rotatable about its axis; and

a second positioning member configured to position the rotary cutter in a circumferential direction to form a circumferential positioning state in which the rotary cutter can maintain contact of a rotary cutting edge thereof with the grinding wheel to grind the rotary cutting edge in an extension direction of the rotary cutting edge;

wherein the first positioning assembly is coupled to the table in a manner reciprocatingly movable in the axial direction, and the second positioning assembly is coupled to the table in a manner stationary relative thereto in the axial direction.

2. The hob grinder of claim 1, wherein said rotary cutting edge is helical and extends in both said axial direction and said circumferential direction.

3. The hob grinder of claim 1 or 2, wherein the first positioning assembly includes:

the sliding table is arranged on the workbench through a sliding structure;

the positioning shaft is arranged on the sliding table and can move along with the sliding table; and

the positioning rod is arranged on the sliding table and can move along with the sliding table;

the positioning shaft is configured to rotate around the axis of the positioning shaft, and the hob is detachably sleeved on the positioning shaft and can drive the positioning shaft to rotate;

wherein the positioning rod has an end abutting the positioning shaft, the abutment being arranged to allow the positioning shaft to rotate while restricting movement of the positioning shaft in a radial direction thereof.

4. The hob grinder of claim 3, wherein the second positioning assembly includes a floating positioning member configured to float up to a height opposite a front end of the edge valley prior to insertion into the edge valley of the hob and to move down to a height in contact with an inner bottom surface of the edge valley after insertion into the edge valley.

5. The hob grinder of claim 4, wherein the floating retainer is tensioned by an elastic member to be in close contact with the inner bottom surface of the blade valley.

6. The hob-grinder of claim 4, wherein a roller is connected to the bottom of the floating positioning member, the hob-grinder comprises a stepped shaft which reciprocates transversely, the floating positioning member is driven to float upward when the thick section of the stepped shaft is inserted below the roller, and the floating positioning member moves downward when the thin section of the stepped shaft is inserted below the roller.

7. The hob grinder of claim 6, wherein said stepped shaft and said positioning rod are fixed to the same slide table.

8. The hob grinder of claim 4, wherein the second positioning assembly includes a fixed positioning member, the fixed positioning member is vertically inserted into one edge valley of the hob and the floating positioning member is transversely inserted into the other edge valley of the hob in the circumferential positioning state.

9. The hob grinder of claim 3, wherein the hob grinder includes an indexing post which abuts against the inside of the cutting edge valley, the positioning shaft drives the hob to move in an axial direction, and the hob which moves in the axial direction is driven by the relative sliding movement of the indexing post in the cutting edge valley to rotate the hob for indexing of the rotary cutting edge.

Preferably, the hob grinding machine further comprises a pre-positioning ejector rod, a station of the pre-positioning ejector rod is located in front of a station of the indexing ejector rod, and the pre-positioning ejector rod is configured to push the hob to rotate so as to adjust an initial angle of the hob.

10. The hob grinding machine of claim 3, wherein a concave hole is formed on an end surface of the positioning shaft abutting against the positioning rod, and an end portion of the positioning rod is a tip inserted into the concave hole.

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