JPH07110394B2 - Device and method for integrally connecting low-rigidity parts - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a component having low rigidity, in particular, a shell, a mold (mold), a casting core (core), and further, a bottom core and a water jacket core. TECHNICAL FIELD The present invention relates to a coupling device and a method thereof.

There are always problems connecting low rigidity parts. The reason is that these parts are always at risk of breakage, which makes handling up to the screwed position complicated and expensive to transport. Similarly, both delicate screw feeds and light tightening torques are required to prevent damage to the mating components.

The core used in the casting operation is a low rigidity part. Therefore, the defects that occur during the work will be described below by taking a core for casting as an example.

During the casting operation, the core is formed by hand or by a core molding machine such as a separate multifaceted core box or core die. The individual cores are assembled or joined by gluing or nailing in separate operations. As a result, the manufacturing operation is very complex, labor intensive and time-consuming (German Patent DE
3526265 and German utility model GM 7515919).

The device and method according to the invention are also different from DE 25 22 161. DE 25 22 161 A1 discloses a device and a method for connecting a core for a thermoset casting made up of multiple parts. The casting core is designed to be connected by a metal pin, and the pin is press-fitted into the core.

Further, DE 34 24 911 A1 discloses a device and a method for screwing screws into thin metal sheets.
This method relates to screwing a screw with a thread that is screwed in by itself forming a tap hole into a thin metal sheet, and in this case, the resistance against the withdrawal of the screw is that the thread is a metal sheet. It is designed to increase as it bites while deforming.

Further, it has been found that in the work of joining parts of low rigidity, or nailing or screwing the individual parts together, the material of the parts to be joined is easily broken by the shearing forces generated during the work.

Therefore, the object of the present invention is mainly to connect a device having low rigidity to each other, in particular, a shell, a mold, a core for casting, preferably a bottom core and a water jacket core. It is to provide a device. This device eliminates intermediate work,
The parts to be joined can be directly transported from the manufacturing place to the connecting place. By doing so, the possibility of breakage of the parts connected together or the possibility of material breakage can be greatly reduced.

It is also an object of the present invention to provide a corresponding method.

According to the invention, the problem is solved by providing a gripping device for gripping integrally connected parts and at least one screw driver comprising a screw spindle and a drive means for this screw spindle. It Preferably, the screw spindle is biased and attached at least in the inserting direction of the tapping screw.

In order to connect corresponding parts together at a predetermined position, a gripping device for gripping the parts to be connected together, and at least one screw driver having a screw spindle and a driving means for the screw spindle. Is considered necessary. In addition, material damage or material breakage that often occurs when connecting less rigid parts together is primarily due to coarse tapping screw insertion. According to the invention, such coarse tapping screw insertion is mitigated when the tapping screw is resisted by the material, at least in the direction of insertion of the tapping screw, by the elastic support of the screw spindle.

Particularly practical, a spring housing is provided between the drive means of the screw spindle and the screw spindle so as to constitute an elastic support of the screw spindle. The spring housing is adapted to cooperate with at least one spring element acting between the drive means and the screw spindle.

In relation to the material of the tapping screw and the components that are connected together, the tapping screw is determined by the advance of the screw spindle and the speed and pitch of the driven tapping screw without adversely affecting the engaging force of the screw spindle. In order to adjust the insertion difference between the insertion speed and the insertion speed, the drive pin is attached to the spring element in a practical manner,
Therefore, the drive pin will act as a coupling or actuation coupling between the spring element and the tapping screw.

Furthermore, it is conceivable that the material of the low-rigidity component will be damaged when an excessive tightening force is applied other than when the screw is roughly inserted. Therefore, it is necessary to reduce the tightening force so as to prevent the material from being damaged even in the range where the tolerance is not allowable. However, when the tapping screw is automatically inserted by compressed air,
It is also possible to hold the tapping screw by the gripping jaws. In this case, the gripping jaws exert a holding force, for example, via a leaf spring. However, by doing so, when the head of the screw repels the holding force of the leaf spring through the gripping jaw, the tightening force is significantly affected,
Keeping the required tightening force to be applied to the screw constant is
Haze becomes impossible.

In order to limit the clamping force, it is particularly effective to provide the drive means, ie the screwdriver, with a means for limiting the torque by means of a suitable adjustable automatic disconnect clutch. This clutch is provided in the drive means.

A gripping jaw is provided to hold the screw when the screw is automatically inserted. The holding force is generated by a pneumatic or hydraulic cylinder piston mechanism. The gripping jaws open for threading.

However, when joining low-rigidity parts, especially brittle parts, dust particles such as chips are scattered by the drive of the screw, and as a result, they penetrate into the part of the gripping jaw and increase the frictional force there. Frequent damage to the jaw due to this. Therefore, in a further embodiment of the present invention, the blower blows or sucks particles of the integrally connected parts during the screwing operation into the device area.

In addition, in the device of the present invention, the screw spindle is elastically supported laterally with respect to the inserting direction of the screw so that a screw which is not aligned with the original axis of the screw spindle can be inserted in a proper manner. Has been done. Therefore, the screw has a slight gap in the direction perpendicular to the screw insertion direction,
This allows the screw spindle to tilt slightly.

An injector is provided for inserting the screw by means of a screwdriver when the screw is rotated and inserted, in particular when the target parts are automatically joined. In order to safely advance the individual screws with the screw spindle, i.e. to connect the parts together, the injector comprises a reflected light barrier which monitors and controls these operations.

Finally, the position of the screw driver can be selectively changed by the position adjusting spindle in two directions orthogonal to the lateral direction, whereby the screw driver adjusts the insertion position of the screw. .

Provided by the present invention. A method of connecting low rigidity parts together, especially shells, molds, cores for castings,
Preferably, in the method of integrally connecting the bottom core and the core for the water jacket, the parts to be integrally connected are first lifted by the gripping device,
And they are kept together. The part is then placed in the working position of the screwdriver. When the foundry cores are connected together, the parts, i.e. the cores, are placed in the correct position on top of one or more screwdrivers. One or more tapping screws are then fed into the screwdriver. And the parts are screw insertion,
That is, they are connected together without adversely affecting the contact force by means of elastic supports, which are adjusted by the screw insertion speed, in particular by suitable methods to prevent damage to the parts or to prevent crushing.

In order to prevent damage to the components that are connected together, the task of driving the screw has a further effect in such a way that the torque of the screwdriver is defined, that is to say controlled by a suitable adjustable automatic disconnect clutch. .

There are various other possibilities of modifying and further improving the invention in a useful way. Therefore, reference should be made firstly to the claims, and secondly to the following description of the invention with reference to the drawings. With regard to the description of the preferred embodiment with reference to the drawings, the preferred embodiment of the invention and further improvements will be described. The description of the drawings is as follows.

FIG. 1 is a schematic side view of an embodiment of the device according to the invention.

FIG. 2 is a schematic front view of FIG.

FIG. 3 is a schematic top view of FIG.

FIG. 4 is an enlarged cross-sectional view of a component, a screw driver and a screw that are integrally connected.

FIG. 5 is a partially enlarged longitudinal sectional view of a device according to the present invention.

FIG. 6 is a schematic axial view of the screwdriver of the device of FIG.

FIGS. 1 to 3, 5 and 6 show an embodiment of the device according to the invention for screwing together weak parts 1 and 2 together. This device is a screw fixing device for integrally screwing a core for casting, that is, a bottom core 1 and a core 2 for a water jacket.

The screw 5 used in the present invention is, as shown in the drawing, a female screw (so-called "tapping screw" that is screwed into a mating member while making a tap hole).

The device of the invention comprises a gripping device 3 for supporting the casting cores 1, 2 which are screwed together, and a screw driver 6 with a screw spindle 10 and a drive means 11 for this screw spindle 10. It becomes.

As shown in FIG. 6, the screw spindle 10 is mounted while being biased at least in the screwing direction. A spring housing 12 with a spring element 13 acting between the drive means 11 and the screw spindle 10 is provided to movably support the screw spindle 10 between the drive means 11 of the screw spindle 10 and the screw spindle 10. ing. In the spring element 13,
A drive pin 14 is provided.

Further, the torque of the driving means 11, that is, the screw driver 6 is set by an adjustable automatic disconnecting clutch (not shown) provided in the driving means 11.

A gripping jaw 15 is provided to hold the screw when it is automatically fed. The force required for gripping is generated by a pneumatic or hydraulic cylinder piston device 16. The gripping jaw 15 opens only when the screw 5 is passed.

Parts that have penetrated the inside of the device during the screwing work1,
The second particles are removed by the blower 17 or via a suction device (not shown).

Although not shown in the drawing, the screw spindle 10 may be biased and attached at right angles to the screwing direction. As a result, even the screw 5 that is not aligned with the central axis of the screw spindle 10 (that is, the original axis) can be easily screwed in.

Reference numeral 4 in FIGS. 1 and 5 is an injector for supplying a tapping screw 5 rotated by a screw driver 6. The injector 4 may also include a device for sorting the tapping screws 5. However, this device is not shown in the figure.

The device of the present invention performs the following operations.

The components 1 and 2, that is, the bottom core 1 and the water jacket core 2 are assembled, that is, integrated, and fixed in an integrated state while being suspended by the gripping device 3. . The fixed parts 1, 2 are then moved above the screwdriver 6.
One or more screws 5 are pneumatically supplied by the injector 4 through the insertion holes 8 in the gripping jaws 15. Parts 1,2
Are then united by screws.

The threaded position of each of the spindles 10 can be predetermined by the position adjusting spindle 7. That is, as shown in the drawing, the screwing position of each of the screw spindles 10 is adjusted by the position adjusting spindle 7 in two directions which are lateral to the axial direction of the screw spindle 10 and orthogonal to each other (that is, , X, Y-axis direction).

The drive motor 11 includes a spring housing 12, a spring 13, and a drive pin 14, and a screw spindle 10 adjusts the feed speed of the tapping screw 5, that is, the insertion speed of the screw 5, while gradually connecting the parts 1 and 2. Let At this time, the torque adjustment function described above does not adversely affect the contact pressure applied to the screw 5 by the screw spindle 10. At this time, the screw 5 is operated by the air cylinder 16 and the gripping jaw 15
Is held by.

For reference, reference numerals 18 and 19 are a ball bearing and a bearing sleeve.

The present invention relates to connecting two weak parts. The screwing of a casting core with a tapping screw is only one example.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-63-34031 (JP, A) JP-A-57-84686 (JP, A)

Claims (13)

[Claims] 1. A device for joining fragile parts which are low in rigidity and which are fragile, and which comprise gripping means for supporting the parts in a relationship to be joined and tapping the supported parts for integrally joining the parts. A screw spindle having a drive axis for driving the screw into rotation and screwing the screw, the screw spindle having a tip shaped to engage the tapping screw to impart rotation to the tapping screw; Drive means for rotating the screw spindle about the drive axis and limited movement of the screw spindle in an axial direction away from the tapping screw driven when the screw spindle is rotated by the drive means And a spring urging means for permitting the movement of the screw spindle. Means for mounting the screw driver means adjacent to the gripping means to allow position adjustment of the screw driver means, the mounting means in one of two transverse directions orthogonal to each other, the screw driver means A device having means for selectively moving the device. 2. A spring housing comprising at least one spring element acting between said drive means and said screw spindle for elastically supporting said screw spindle, said spring housing comprising said drive means of said screw spindle and said screw spindle. A device according to claim 1, characterized in that it is provided between and. 3. Device according to claim 2, characterized in that the spring element is a compression spring. 4. Device according to claim 2 or 3, characterized in that the spring element is provided with a drive pin. 5. The torque according to any one of claims 1 to 4, wherein the torque of the drive means is defined by an appropriately adjustable automatic disconnection clutch provided on the drive means. Or one device. 6. Device according to claim 1, characterized in that the driven tapping screw is monitored by means of an optical detection sensor. 7. A gripping jaw for holding the screw is provided for the automatic insertion of the screw, and the gripping force is generated by a pneumatic or hydraulic cylinder-piston mechanism. 7. A device according to any one of claims 1 to 6, characterized in that the jaws open into the passage of the screw without deviating from the center of the screw. 8. Particles of the integrally connected parts which enter the area of the device during the screwing operation are blown off by the blower means or removed by the suction means. The apparatus according to any one of items 1 to 7. 9. The screw spindle is elastically retained transversely to the screw feed direction so that the screw is coupled even when not aligned with the original axis of the screw spindle. Device according to any one of claims 1 to 8, characterized in that 10. An injector according to claim 1, further comprising an injector for supplying the screw.
The device of any one of the clauses. 11. A device according to claim 10, characterized in that the injector comprises a device for screening the screws. 12. A method of connecting fragile and fragile parts, supporting the parts in a relationship to be connected and rotating a tapping screw on the supported parts to connect the parts together. A screw driver means is provided for driving and screwing, the means comprising a drive axis, the screw spindle having a tip shaped to engage the tapping screw to impart rotation to the tapping screw, and Drive means for rotating the screw spindle about a drive axis and allowing limited movement of the screw spindle axially away from the tapping screw driven when the screw spindle is rotated by the drive means Spring biasing means for ensuring that the drive axis and the supported component are in precise alignment with each other. Selectively aligning the screw driver means in one of two transverse directions orthogonal to each other, advancing the tapping screw to a position between the parts to be joined and the screw spindle; Engaged tapping screw with the tip of the screw spindle, actuating the drive means to rotate the screw spindle and tapping screw to advance the tapping screw into the supported component, And connecting them together. 13. When the tapping screw is driven,
13. The method according to claim 12, wherein the torque of the screwdriver is defined, i.e. controlled by an appropriately adjusted self-locking clutch.